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Van, Greunen Corneluis Erasmus. "Neutral-point-clamped shunt active filter." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1265.
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Sedighy, Mohammad. "A robust VSC-based shunt active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/NQ41307.pdf.
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El-Habrouk, Mohamed. "A new configuration for shunt active power filters." Thesis, Brunel University, 1998. http://bura.brunel.ac.uk/handle/2438/5241.
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This thesis presents a new power circuit configuration to be used in shunt active power filters. A new control algorithm based on the linear voltage control suitable for the proposed circuit is introduced. The system is analysed both in time and frequency domains. The practical implementation of the system proves its suitability for the proposed task. The switching frequency of the proposed circuit is much lower than that in other active filters. The switching losses are then considerably reduced, in addition to the fact that the switching devices can withstand larger values of currents being switched on and off at lower frequencies which is an advantage to this circuit. The component sizes (capacitors and inductors) in the proposed circuit are also much smaller than those in other filter configurations. In addition, the thesis presents a new method for categorising the active filter systems proposed in the surveyed literature. The survey includes a comparison of these techniques showing their respective merits and drawbacks. The thesis also includes an implementation of a reference current generator that is suitable for single-phase applications without the need for excessive computations. The technique involves a modified Fourier analysis, which is suitable for active filtering applications.
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Carastro, Fabio. "Power quality enhancement using a shunt active filter with energy storage." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493118.
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Electrical systems are subject to a wide variety of power quality problems which can interrupt production processes, affect sensitive equipment, and cause downtime. Several power quality studies show that harmonics and voltage sags have been identified as the most serious problems facing industrial customers today, especially in small independent grids which employ distributed generation units.
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Fereidouni, Alireza. "Shunt Active Power Filter Enhancement Using Advanced Control and Modulation Techniques." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/2482.
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This thesis aims to enhance the performance of SAPF by proposing advanced techniques: A new frequency locking complex adaptive linear combiner; A new combined particle swarm optimization adaptive linear combiner; A constant frequency space-vector hysteresis control for two-level SAPFs; Extending the previous proposed modulation technique for three-level neutral-point-clamped (NPC) SAPFs; A new five-level adaptive hysteresis-band technique for five-level NPC-based SAPFs; A new adaptive proportional-integral-type fuzzy logic controller fur fast DC voltage control and reference current generation.
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Massoud, Ahmed Mohammed. "Application of the cascaded multilevel inverter as a shunt active power filter." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/321.
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Zhang, Huibin. "Application of multilevel inverter as shunt active power filter in three-phase three-wire power system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501797.
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This research investigates application issues of the active power filter to three-phase three-wire systems, with unbalanced, distorted loads where the line impedance gives rise to voltage distortion at the point of common coupling. Five shunt active power filters are investigated: two-level, wye connected cascaded three and five level, and diode-clamped three and five level. Capabilities of the different shunt active power filter topologies to mitigate voltage/current distortion, compensate reactive power, and balance real power from the source are investigated. Results indicate that neutral point clamped multilevel inverters have advantages over wye cascaded multilevel inverters when operating under asymmetrical load conditions.
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Senturk, Osman Selcuk. "Series Active Filter Design, Control, And Implementation With A Novel Load Voltage Harmonic Extraction Method." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608819/index.pdf.
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Series Active Filters (SAF) are designed for harmonic isolation and load voltage regulation of single-phase and three-phase voltage harmonic source type nonlinear loads. The novel Absolute Value Method (AVM) for load voltage harmonic extraction is proposed and applied in the control algorithm of SAF. The SAF compensated systems are represented by simplified linear models such that SAF controller gains can be easily determined. Harmonic isolation and load voltage regulation performances of 2.5 kW single-phase and 10 kW three-phase SAF compensated systems are evaluated by detailed simulations. Laboratory prototype single-phase and three-phase SAFs and loads are designed and manufactured. Digital signal processor based control platform is employed. Exclusive laboratory tests are conducted. Via laboratory experiments and simulations it is shown that AVM yields superior harmonic isolation and load voltage regulation performance compared to the conventional low/high pass filtering method. Theory, simulations, and experiments are well correlated and illustrate the feasibility of the proposed method.
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Gomes, Zariff Meira. "Filtro Ativo Trifásico Shunt com Número Reduzido de Indutores." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/7552.
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Previous issue date: 2015-07-24<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>This work presents an active power filter for three-phase three-wire systems without an
inductor when compared to the usual structure of a shunt active power filter. For the
determination and control of the references it was used the Park’s transformation, it means
that all control was done in synchronous axes. The active filter of this work is in parallel
configuration acting therefore as a current source and should correct the power factor
and current harmonics selectively of the power grid. Simulation results were presented
validating the control strategy.<br>Neste trabalho é apresentado um filtro ativo de potência trifásico para sistemas a trifásicos
a três fios com um indutor a menos em comparação com a estrutura usual de um filtro
ativo shunt. Para a determinação das referências e controle foi utilizada a transformada
de Park, ou seja, todo o controle foi feito em eixos síncronos. O filtro ativo deste trabalho
está na configuração paralela funcionando, portanto, como uma fonte de corrente e deverá
corrigir o fator de potência e harmônicos de corrente da rede elétrica, estes últimos de
forma seletiva. Foram apresentados resultados de simulação validando a estratégia de
controle.
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Silva, Paulo Vitor. "Implementa??o experimental de filtro ativo paralelo de pot?ncia com aplica??o a gerador de indu??o trif?sico." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15322.
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Previous issue date: 2010-06-28<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>This work describes the experimental implementation of a shunt active power filter applied to a three-phase induction generator. The control strategy of active filter turned to the excitation control of the machine and to decrease the harmonics in the generator
output current. Involved the implementation of a digital PWM switching, and was made a comparison of two techniques for obtaining the reference currents. The first technique is based on the synchronous dq reference method and the second on the theory of instantaneous power. The comparison is performed via simulation and experimental results. To obtain the experimental results, was mounted a bench trial and the control and communications needed were implemented using DSP - MS320F2812. The simulation results and experimental data proved the efficiency of the filter to apply, highlighting the technique of instantaneous power<br>Este trabalho descreve a implementa??o experimental de um filtro ativo paralelo de pot?ncia aplicado a um gerador de indu??o trif?sico. A estrat?gia de controle do filtro ativo voltou-se para o controle de excita??o da m?quina e para a minimiza??o dos harm?nicos na corrente de sa?da do gerador. Envolveu a implementa??o de um chaveamento PWM digital, tendo sido realizada a compara??o de duas t?cnicas para obten??o das correntes de refer?ncia. A primeira t?cnica se baseia no m?todo referencial s?ncrono dq e a segunda na teoria das pot?ncias instant?neas. A compara??o ? realizada via simula??o e resultados experimentais. Para obten??o dos resultados experimentais, foi montada uma bancada experimental e o controle e comunica??es necess?rias foram implementados utilizando-se um DSP - TMS320F2812. Os resultados de simula??o e experimentais obtidos comprovaram a efici?ncia do filtro para a aplica??o, com destaque para a t?cnica das pot?ncias instant?neas
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Pahmer, Sueda Carmen M. "Contribution à l'étude de filtres actifs de puissance de type shunt : commande-simulation." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0080.
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Le travail presente consiste a etudier de maniere detaillee les algorithmes de commande d'un filtre actif de puissance de type shunt realise a partir d'un onduleur de tension connecte sur un reseau triphase de puissance finie. Ces algorithmes ont ete testes en simulation a l'aide du logiciel a usage general electro-magnetic transients program (emtp). A ce propos, cinq methodes distantes pour obtenir les courants de reference pour chaque phase de l'onduleur de tension ont ete formalises. De la meme maniere, la regulation de tension aux bornes du condensateur de cet onduleur a egalement ete abordee. Dans certains cas de figure la numerisation controle-commande a ete developpe de maniere a simuler des structures les plus proches possibles de la realite. Quelques resultats experimentaux obtenus a l'aide d'un filtre actif de commande numerique permettent de valider notre methodologie
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Bernáth, František. "SW nadstavba analyzátoru sítí pro automatický návrh nn kompenzační jednotky na základě měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218704.
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Thesis is devoted to a problem of Power Factor Correction on the low voltage level. It has still its own difficulties despite the fact that topic moved through long development. The main goal of this work is to offer reader variable procedure considering design process. It is based on use of measured data of network analyzer Meg30. The design algorithm has to share a maximum of eventual influencing factors. Therefore the body of master thesis goes through detailed analysis of Power Factor Correction.
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Chen, Cheng-Che, and 陳正哲. "A Novel Approach to the Design of Series and Shunt Three-Phase Four-Wire Active Power Filters." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/60285857990615969845.
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博士<br>國立臺灣大學<br>電機工程學研究所<br>88<br>ABSTRACT
A new approach is presented for the design of a shunt and a series active filter in a three-phase, four-wire distribution system with unbalanced, distorted sources and unbalanced loads. The purpose of the shunt active filter is to provide compensation currents such that the source needs to supply balanced (positive-sequence) fundamental source current at unity power factor even though the load consumes harmonic currents as well as positive, negative, and zero-sequence currents. The purpose of the series active filter is to provide compensation voltages such that balanced (positive-sequence) fundamental voltages can be obtained for the load even though the source voltages are distorted. A major feature of the proposed approach is that it does not require symmetrical component transformation to transform the three-phase voltages and currents to 0-d-q quantities. This makes practical implementation of the proposed method easier than the symmetrical component transformation approach. Moreover, only positive-sequence power is supplied by the source. In this dissertation, a novel fixed-band hysteresis virtual current controller is also presented. In the proposed approach, the maximum switching frequency is limited while the advantage of simplicity of implementation in a fixed-band hysteresis current controller is retained. To demonstrate the effectiveness of the novel fixed-band hysteresis virtual current controller, a solid-state reactive power compensation system with a voltage-source pulsewidth modulated inverter has been simulated on a computer. The effectiveness of the proposed control algorithm is also demonstrated by computer simulation and experimental results from a series and a shunt active filter for a three-phase four-wire distribution system with distorted, unbalanced source voltages and unbalanced loads.
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Huang, Jhong-Wei, and 黃仲維. "A Shunt Active Power Filter for Harmonic Isolation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/47754233242281222953.
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Saswat, S. "Study of single phase shunt active power filter." Thesis, 2014. http://ethesis.nitrkl.ac.in/5901/1/E-84.pdf.
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The use of power electronic devices is increased enormously. And this leads to very low power factor in the power system. Also harmonics are caused by these power electronic devices. Active power filter is a method to reduce harmonics and improve the power factor. This report is intended to provide a method to filter the harmonics and improve the power factor. All goals, design procedures, conclusions are within the report. By this by switching the suitable PWM modulator pulse we can reduce the any no. of harmonics. Mostly 3rd harmonics are present in the power system. Simulation results are also shown which shows that elimination of harmonics can be done with this method. Hybrid Active Power Filter (HAPF) has been proposed to overcome the disadvantages of APF and PF. It is a combined system of PF and APF. Appropriate choice of passive filters and detailed design method for the same is being presented in this thesis, which when combined with APF will eliminate the higher order harmonics.
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Gupta, Rahul Kumar. "Implementation of Shunt Active Power Filter(SAPF) algorithms." Thesis, 2014. http://ethesis.nitrkl.ac.in/6431/1/E-73.pdf.
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Improving power quality has been the major research topic in last few decades due to flooding of semiconductor and other non-linear devices. The power quality of any source is judged by the some indexes defined by international bodies such harmonics factor, telephonic interference level (TIF) etc. Using the different harmonic compensation schemes we must be able to meet those index limits. This is very important in reference to performance and economy of operation. Power filters are widely used in modern electrical distribution system to eliminate the harmonics associated with it. The active power filter (APF) is one of power filters which have better dynamic performance. The APF needs an accurate control algorithm that provides robust performance under source and load unbalances. The control methods are responsible for generating the reference currents which used to trigger the Voltage Source Inverters (VSI). Thus, compensation of harmonics depends largely on the algorithm adopted. For any Shunt APF system there is various way of implementing the control block whose output goes to gate of the voltage source Inverter. Further, the harmonic and frequency has been modeled to propose a new control strategy for the shunt Active Power Filter. The Least Mean Square (LMS) algorithm is the basic estimation algorithms which estimate the parameters based on only present data. The Recursive Least Square (RLS) algorithm uses recursive method to estimate the parameters using both present and past values. In this thesis, main aim is to implement a basic control algorithm in MATLAB-SIMULINK first then the harmonic and frequency estimation part is implemented in MATLAB. Further the estimation part is implemented using the Arduino Mega 2560 Microcontroller for experimental validation.
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Shiu, Jeng-Jang, and 許政章. "Implementation and Verification of High Power Shunt Active Power Filter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qjg6bf.
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Kumar, D. Pradeep. "Investigations on shunt active power filter for power quality improvement." Thesis, 2007. http://ethesis.nitrkl.ac.in/4306/1/%E2%80%9CInvestigations_On_Shunt_Active_Power_Filter_For.pdf.
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Most of the pollution issues created in power systems are due to the non-linear characteristics and fast switching of power electronic equipment. Power quality issues are becoming stronger because sensitive equipment will be more sensitive for market competition reasons, equipment will continue polluting the system more and more due to cost increase caused by the built-in compensation and sometimes for the lack of enforced regulations. Efficiency and cost are considered today almost at the same level. Active power filters have been developed over the years to solve these problems to improve power quality. Among which shunt active power filter is used to eliminate and load current harmonics and reactive power compensation. In this work both PI controller based and fuzzy logic controlled, three-phase shunt active power filter to compensate harmonics and reactive power by nonlinear load to improve power quality is implemented for three-phase three wire systems. The advantage of fuzzy control is that it is based on linguistic description and does not require a mathematical model of the system. The compensation process is based on sensing line currents only, an approach different from conventional methods, which require sensing of harmonics or reactive power components of the load. A MATLAB program has been developed to simulate the system operation. Various simulation results are presented under steady state conditions and performance of fuzzy and PI controllers is compared. Simulation results obtained shows that the performance of fuzzy controller is found to be better than PI controller. PWM pattern generation is based on carrier less hysteresis based current control to obtain the switching signals to the voltage sourced PWM converter.
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Li, Chien-Hsing, and 李建興. "A Shunt Active Power Filter Adopting Lyapunov Control Approach." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/97226794328213955465.
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博士<br>雲林科技大學<br>工程科技研究所博士班<br>98<br>In this dissertation, a Lyapunov-based current control method is proposed for a single-phase shunt active power filter (APF) to reduce source current harmonics and reactive power. Most studies only show control block diagrams with classic control methods. These control schemes look very attractive for their simplicity and ease of implementation, but lack in presenting an adequate compensation algorithm or stability analysis of active power filters.
The control law is derived from directly applying the Lyapunov stability theory to the integral controller, so that the closed-loop systems possess better harmonic current elimination. The proposed APF controller forces the supply current to be sinusoidal, with low current harmonics, and to be in phase with the line voltage. An experimental model of the active power filter has a power rating of 1 kW. The switching frequency of the active power filter is 20 kHz which can be produced by the electronic devices. The power factor is improved from 0.63 to 0.97 and the THD is reduced from 56% to 3.74% with a phase-angle controlled load. Computer simulations and experimental results obtained from a laboratory system developed in this dissertation verify the viability and effectiveness of the full-digital-controlled active filter.
The features of the proposed system include: 1) the performance of the APF is much improved when adopting the Lyapunov stability approach. It is easy to select a suitable control gain to achieve stability compensation while maintaining the system stability. 2) Better harmonic compensation performance is obtained because the Lyapunov-based theory is used in the control algorithm, which is very important for active power filters to be used in practical applications.
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Prafulla, Mandava Divya. "Power Quality Improvement Using Multilevel Inverter Based Shunt Active Filter." Thesis, 2015. http://ethesis.nitrkl.ac.in/6856/1/POWER_Prafulla_2015.pdf.
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Harmonics have become a major issue in the recent times due to the high usage of power electronic equipment. Harmonics lead to many problems such as overheating of equipment, interference with the near, by communication lines, high power loss, low power factor and hence poor usage of equipment. Shunt active filters are used to compensate these harmonics and draw only fundamental component of current from the supply. The shunt active filters be designed using multilevel inverters are more efficient when compared to the classical inverters due to their step voltage waveform. In this work, multilevel inverter based shunt active filters are designed using different controllers such PI and fuzzy logic controllers. There is no requirement of a precise mathematical model when fuzzy logic controllers are used for their design unlike the PI controller. A three level H-bridge was used as the inverter for the filter design. The instantaneous active (iLd), reactive(iLq) components of load current are used to produce the reference compensation currents in this Id-Iq control method. Matlab simulation was used to verify the results.
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Satpathy, Subhransu, and Siddharth Shankar Bebarta. "Power Quality Improvement in 3 – Phase System Using Shunt Active Filter." Thesis, 2013. http://ethesis.nitrkl.ac.in/5395/1/109EE0303.pdf.
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Voltage, current and frequency are the three physical characteristics that mostly define the power quality and a power quality issue is defined as “any occurrence manifested in current, voltage, or frequency deviations that results in damage, upset or failure of end-use equipments”. The higher switching frequency and the non-linearity in the properties of the power electronics devices are mostly responsible for the power quality issue. So importance is being given to the development of Active Power Filters to solve these problems to improve power quality among which shunt active power filter is used to eliminate voltage and load current harmonics and for reactive power compensation. The shunt active power filters have been developed based on control strategies like instantaneous active and reactive power compensation scheme (p-q control) and instantaneous active and reactive current scheme (Id-Iq control). Considering its superior nature, a study on the Id-Iq control scheme based shunt active filter is brought out in this project. The compensation is carried out by the use of PI based controllers. A theoretical study based on both the compensation schemes is done in this project and then the theory of Id-Iq control scheme is implemented in simulation work and its harmonic compensation results are analyzed.
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Garain, Gour Sunder. "Current Control of Self-Excited Induction Generator using Shunt Active Filter." Thesis, 2014. http://ethesis.nitrkl.ac.in/5815/1/212EE4244-3.pdf.
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Self-energized impelling generators are great applicants for wind controlled power era, particularly in remote territories, in light of the fact that they needn't bother with an outside force supply to process the excitation attractive field. A three-stage actuation machine could be made to fill in as a self-energized instigation generator where a three-stage capacitor bank is joined over the stator terminals to supply the touchy force necessity of a heap and generator. A standout amongst the most well-known issues when uniting little renewable vitality frameworks to the electric burden is it can infuse symphonious parts that may fall apart the force quality. In the late decades, the world has seen a development in the utilization of non-direct loads. The sounds causes issues in force frameworks and in customer items, for example, gear overheating, capacitor blowing, engine vibration, unnecessary nonpartisan momentums and low power variable. Shunt active power filter compensates current harmonics by injecting equal-but-opposite harmonic compensating currents into the grid. This paper presents a new control strategy based on shunt active power filter for controlling the current of self-excited induction generator when generator is connected to a nonlinear load. This paper also represents the analysis and modelling of dynamic model of SEIG in MATLAB/ SIMULINK. Basically a strategy based on an active power filter (APF) for controlling the current and power quality of the self-excited induction generator (SEIG) have been presented in this paper. The shunt active power filter was implemented using a three phase PWM current controlled voltage source inverter (VSI) and connected to the wind generator and loads in order to compensate the current harmonics and reactive power.
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Yang, Ming-Ji, and 楊銘基. "Design and Implementation of High Performance Shunt Active Power Filter Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/46865953293973391507.
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博士<br>國立中央大學<br>電機工程研究所<br>97<br>The main objective of this dissertation is to design and implement high performance shunt active power filter (APF) systems. In the past, most shunt active power filters used proportional integral (PI) controller. However, it may be necessary to retune the PI parameters for different operation conditions. Therefore, this dissertation proposes two kinds of controllers, which are robust and adaptive, for a single-phase shunt APF to improve line power factor (PF) and mitigate line current harmonics. The APF systems respectively include a Takagi-Sugeno (T-S) fuzzy and model reference adaptive controllers (MRAC). Because APF is a bilinear system, it is not easy to design the controller. Hence, this dissertation firstly employs the linearization method to approach the nonlinearity of the system and solve the stability problem.
In the T-S fuzzy controller design, the parallel distributed compensation (PDC) is employed with the T-S models. To find stable feedback gains and a common positive-definite matrix for the designed fuzzy control system, it is based on Lyapunov’s stability theory and solved via MATLAB’s linear matrix inequality (LMI) tool. In the MRAC design, Lyapunov’s stability theory and Barbalat’s Lemma are used to design an adaptive law which guarantees asymptotic output tracking for the system. While compared with the conventional proportional-integral (PI) control, the advantages of the T-S fuzzy and MRAC are more flexible, adaptive and robust. Moreover, MRAC can self-tune the controller gains to assure the system stability.
To verify the proposed systems, a digital signal microcontroller (dsPIC30F4012) is utilized to implement the control algorithms. And an 1-kVA laboratory prototype of the active power filter is built to test the feasibility. Both simulation and experimental results are provided to verify the effectiveness of the proposed active power filter systems which increase the power factor, reduce the current harmonics and enhance the robustness of the transient response.
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Lakpathi, Eslavath. "Performance analysis of shunt active power filter using different switching signal generation techniques." Thesis, 2018. http://ethesis.nitrkl.ac.in/9887/1/2018_MT_216EE4304_ELakpathi_Performance_analysis_of_shunt_active_.pdf.
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The performance of shunt active power filter (SAPF) for various pulse width modulation (PWM) control techniques associated for steady state load conditions. SAPF used for the elimination of harmonics from the supply current when the ac or dc type of the single phase nonlinear type of loads connected in the system. SAPF injecting the compensating current to equal and opposite current to create the source current sinusoidal and also supply the compensating current required by the nonlinear load. The active power filters have increased much more consideration because of its tremendous performance to moderate the harmonic and reactive power issues. SAPF with synchronous reference frame (SRF) theory has proposed for compensation of harmonics and the reactive power compensation. The various PWM techniques are used for comparing the source current Total Harmonic Distortion (THD). The switching signal generation techniques are Hysteresis Current Controller (HCC), Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) used for analyzing the system over all response, switching frequency and the percentage of THD of the SAPF. The switching frequency of the HCC is not fixed but in other two methods the switching frequencies are fixed. The switching loss of SVPWM is less compared with other two control techniques. For regulating voltage in SAPF, two controllers are used such as PI and fuzzy logic controllers for minimization of in which PI controller requires the mathematical model of the system but the fuzzy controller doesn’t required any mathematical model and it is user friendly tool to analyze the overall system performance. The percentage of THDs are compared aforesaid schemes and obtained less source current THD using SAPF and SVPWM with fuzzy control as compared to HCC-PI, HCC-Fuzzy, SPWM-PI, SPWM-Fuzzy, and SVPWM-PI. Also, the obtained source current THDs of all control schemes simulated performance in MATLAB are closer to within IEEE519 standards only.
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Yeh, Chia-Ming, and 葉家銘. "Optimization-Based Reference Compensation Current Strategies for Shunt Active Power Filter Control." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/86757520007496567750.
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碩士<br>國立中正大學<br>電機工程研究所<br>92<br>A new theory and a conceptual design for the three-phase shunt active power filter (APF) control strategy under imbalanced and distorted supply voltages are present in the thesis. Conventionally, the compensation currents injected by the APF are determined according to reference frame transformation-based approaches, where the load instantaneous real and reactive powers are calculated in the new reference frame. The APF injection currents are then computed to maintain the balanced and sinusoidal source currents, as well as the least active power consumption by the APF. However, if current harmonics set by harmonic standards or other constraints are considered, the load harmonic currents after APF compensation can be controlled to meet the requirement. Therefore, the APF may have an adjustable performance. This thesis proposes an optimal algorithm for the APF control in steady state, where the individual and total harmonic current distortion limits, the minimum load power factor, levels of current imbalance, and the size of the APF can be taken into account. The planned APF does not consume or produce the active power and only the passive energy-storage elements are required in the new APF design. Results obtained by simulations with Matlab and Simulink show that the proposed approach is more flexible than the conventional approaches on compensating reactive power and harmonic/neutral currents of the load, even if the source voltages are severely distorted and imbalanced. The new control strategy is very suitable for planning the APF when several alternate objectives and constraints that are under considerations.
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Barcenas, Rolando Alonso Aguilera, and 羅藍. "A Comparative Study on Current Regulators for a Shunt Active Power Filter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/15454959977839615050.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>104<br>Extensive use of passive filters has been reported in order to reduce current harmonic distortion levels produced by nonlinear loads. Due to numerous drawbacks associated with passive filters, several active filter topologies have been applied, however the background of this thesis will focus on “Shunt Active Power Filters”.
The assessment of the performance of the current controllers of the Shunt Active Power Filter (SAPF) is the key point for this thesis. The two most important parts to be concern with respect to the Active Power Filter (APF) is the harmonic detection method and the inner current controller. The harmonic detection method is based on the “P-Q Theory” while the current control techniques studied are: Hysteresis Current Control, Adaptive/Variable Hysteresis Current Control, Predictive Current Control and PI Current Control. Advantages and disadvantages for each current regulator will be highlighted based on same operating conditions.
Simulation results are obtained for a 9.3 KW diode rectifier load under two load conditions, where after the application of the SAPF it is clear how the source current becomes sinusoidal. MATLAB/SIMULINK software is used, to validate the results.
After analysis of simulation results, Hysteresis Current Control and Predictive Current Control provides better performance, while Adaptive/Variable Hysteresis Current Control and PI Current Control should be left for other system conditions.
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HSING, HSIEH CHEN, and 謝禎行. "Development of Shunt-Type Three-Phase Active Power Filter with Adaptive Control." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/33528165276159310525.
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碩士<br>國立臺灣科技大學<br>電機工程系<br>90<br>A new adaptive filter is proposed in this thesis. It combines instantaneous reactive power compensation technology and controller with current predict theory so that this system is characterized by low harmonic distortion，high power factor and small variation of dc-link voltage during load disturbance.
The performance of the system is first simulated by digital computer, and the possibility of adaptive digital low pass filter eliminating current harmonic is confirmed in steady and transient state. Then, a digital personal computer is used to implement the active power filter. The results indicate that under rated operation of 3kVA, the system possesses a total harmonic distortion of current less than 5.0%, a power factor of 1.0 on the utility side. It validates that the transient performance of adaptive filter is superior to traditional digital low pass filter and is more economical of short computation time than other type of adaptive filters.
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Lin, Fei-Yi, and 林毅飛. "Model Reference Adaptive Control Design for a Shunt Active Power Filter System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/69977735580216618856.
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碩士<br>國立中央大學<br>電機工程研究所<br>94<br>In the past, most shunt active power filter uses proportional plus integral and differential (PID) control. When using fixed-gain PID controllers, it is necessary to retune them for different operation condition. In view of the above mentioned problems of PID controlled shunt active power filter, an adaptive control for a single-phase shunt active power filter, which uses the model reference adaptive control (MRAC) approach, is proposed to improve line power factor and to reduce line current harmonics. The proposed shunt active power filter is to control the supply current to be a sinusoidal wave with low current harmonics and in phase with the line voltage. Since the shunt active power filter is a bilinear system, it is hard to analysis of the stability of the system. This paper will solve the stability problem by linearizating the system. Besides, using Lyapunov stability theory and Barbalat’s Lemma, an adaptive law is designed to guarantee asymptotical stability for the system. The control law is implemented through a fixed-point digital signal processor (dsPIC30F4012). Finally, experimental results show that the system performance, such as power factor and total harmonic distortion, has been much improved.
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Amara, Chandrasekhar. "Adaptive hysteresis based fuzzy controlled shunt active power filter for mitigation of harmonics." Thesis, 2013. http://ethesis.nitrkl.ac.in/4645/1/209EE2157.pdf.
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Active filters are widely employed in distribution system to reduce the harmonics produced by non-linear loads result in voltage distortion and leads to various power quality problems. In this work the simulation study of a Adaptive hysteresis based fuzzy logic controlled shunt active power filter capable of reducing the total harmonic distortion is presented. The advantage of fuzzy control is that it is based on a linguistic description and does not require a mathematical model of the system and it can adapt its gain according to the changes in load. The instantaneous p-q theory is used for calculating the compensating current. Fuzzy-adaptive hysteresis band technique is adopted for the current control to derive the switching signals for the voltage source inverter. The fuzzy-adaptive hysteresis band current controller changes the hysteresis bandwidth according to the supply voltage and slope of the reference compensator current wave. A fuzzy logic-based controller is developed to control the voltage of the DC Capacitor. This work presents and compares the performance of the fuzzy-adaptive controller with a conventional fuzzy and PI controller under constant load. The total Harmonic Distortion, Individual harmonic content with respect to % of fundamental in Supply current, source voltage have been analyzed. Various simulation results are presented. And also the performance of two current control techniques namely adaptive hysteresis current control and fixed hysteresis control techniques are compared with respect to average switching frequency. A neural network control method for regulating the DC Voltage across the capacitor connected to the inverter for harmonic suppression is proposed. The THD of the source current after compensation is well below 5%, the harmonic limit imposed by the IEEE-519 standard.
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R, V. L. Narayana Divakar. "Realization of Current control strategies of Shunt Active Power Filter under Unbalanced Load." Thesis, 2013. http://ethesis.nitrkl.ac.in/5327/1/211EE2329.pdf.
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Filtering is the major criteria to maintain power quality improvement in the three phase three wire system. Now a day Active power Filters (APF) is mostly preferable for this purpose. Conventional PI control methods are disadvantageous in eliminating high harmonics in the line current and 2nd harmonics at the DC link of a shunt APF. This PR control method which nullifies 2nd harmonics and provides better performance and accuracy compared to the Conventional positive-sequence control method and DC link voltage control method individually in terms of power quality improvement and cost effectiveness. The performance of the three control methods are demonstrated through simulation and experimental results.
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Dash, Smruti. "A Lyapunov-Function Based Control For A Three-Phase Shunt Hybrid Active Power Filter." Thesis, 2013. http://ethesis.nitrkl.ac.in/4618/1/211EE3145.pdf.
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The denomination Power quality by and large refers to maintaining approximal sinusoidal power distribution bus voltage at rated magnitude and frequency. This is mainly affected by the generation of harmonics. Even though electronic and non-linear devices are flexible, economical and energy efficient, they may degrade power quality by creating harmonic currents and consuming excessive reactive power. A family of various shunt hybrid active power filters has been explored in shunt and series configurations to compensate for different types of nonlinear loads. They provide controlled current injection to remove harmonic current from the source side of electric system and also can improve the power factor.
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Li, Jia-Xi, and 李家璽. "Design of Robust Series Active Power Filter for Microgrid System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5w337z.
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碩士<br>國立中央大學<br>電機工程學系<br>107<br>In the microgrid, Power supply voltage occur voltage sag or a swell due to energy instability or other external factors, or even a more serious power quality problem. Therefore, the serial active power filter can be used to improve these problems.Serial active power filter main purpose of filter out the interference and accurately compensate the voltage , so that the load voltage can be consistent with that before the interference. Therefore, it is also called the Dynamic Voltage Restorer.The main hardware is constructe in a three-phase four-wire converter, so how to use the calculation method and realize the effect of the series active power filter compensator through the hardware system is a major research focus.
Through the experimental results of this paper, it is observed that when series active power filter occur voltage sag and other interference,has the compensation of immediacy and accuracy ,so that the load voltage is kept within a reasonable range, load not Power supply interference is affected.
This paper introduces the operation principle and calculation method of the series active power filter, and then verifies the feasibility of the algorithm through the simulation and test platform,and further realizes the hardware system.
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Pan, Tian-Fu, and 潘添福. "Study and Implementation of a Single-phase Dual-boost Shunt Active Power Filter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/53433852300130581072.
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博士<br>國立臺灣科技大學<br>電子工程系<br>101<br>A dual-boost shunt active power filter (DBSAPF) based on hysteresis current mode control to achieve unity power factor for power factor correction is proposed in this dissertation.The proposed topology can compensate the current harmonics and reactive power generated by the nonlinear load.Generally speaking,the shoot-through problem exists in conventional bridge-type voltage-source inverter,so that the reliability of the inverter is low.The proposed topology can prevent the shoot-through problem, so the dead time between the switches doesn’t need to be set and the reliability of the inverter can been improved.The quality of the input current can be improved as well.The proposed topology of voltage-source inverter combines with the hysteresis current mode control offers an unsurpassed transient response in comparison with other current controllers.Furthermore,it is easy to implement with lower cost and very suitable for non-biased current control and has robust current performance against load and source parameter changes.This dissertation presents the circuit theory and analysis,operating principle,and design guidelines.Some simulation and experimental results are provided to verify the effectiveness and theoretical analysis.
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Kha, Nguyen Tung, and 阮松佧. "A Hybrid Approach for Optimal Control of Three-Phase Shunt Active Power Filter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ue646z.
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碩士<br>國立中正大學<br>電機工程研究所<br>106<br>A shunt active power filter (SAPF) is used to cancel the harmonic current and compensate the reactive power. Under the non-ideal source voltage conditions, the complete elimination of harmonics and near unity power factor simultaneously cannot be achieved. Besides, controlling the SAPF output current aims to (1) control switching harmonics, (2) lower power loss, (3) stabilize the system under changing dynamic load conditions, and (4) reduce the steady-state error. Hence, a hybrid approach for determining the optimal SAPF reference compensating current and optimally controlling the three-phase four-wire SAPF output current is presented in this thesis. This optimal control combination achieves the maximum power factor while the source current harmonics, THD and IHDs, are within the allowable limits of the IEEE Standard 519, as well as the least power loss and switching harmonic. Simulation of the system with the proposed hybrid approach is performed in MATLAB/Simulink and RT-LAB programs. The results show that the proposed method is more effective than traditional approaches in compensating harmonic current and reactive power, reducing power loss, and computing time.
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Kumar, Pravesh. "Use of Super Conducting Magnet for Energy Storage in Shunt Active Power Filter." Thesis, 2015. http://ethesis.nitrkl.ac.in/7171/1/Use_Kumar_2015.pdf.
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Huge application of non-linear load and electronics apparatus in power system generates harmonics. That makes the current wave form distorted and causes huge power loss in power system. This problem can be overcome by application of Shunt Active Power Flitter (SAPF). Shunt Active Power Filters in an electric power network can improve the quality of power system by removing harmonics which are generated by non- linear load. In this project, a voltage-source PWM converter, and a Super Conductor Magnet for energy storage is used to design a Shunt Active Power Filter. Earlier use of copper inductor to store the energy for compensation the harmonics in Shunt Active Power Filter causes a power loss, to reduce these power losses instead of copper inductor a Superconductor Magnet is placed in Shunt Active Power Filter. Shunt Active Power Filter is designed by using ‘Instantaneous Power Theory’ or ‘p-q Theory’. Switching pulses for Voltage source converter is generated by using Hysteresis Band Controller. DC/DC is also designed to control the Super Conductor Magnet. Charging and Discharging of Magnet is base switching operation of DC/DC converter. Total Harmonic Distortion (THD) in wave, during charging and discharging of Magnet is calculated and presented in this paper .The results of simulation are satisfied with all the property explained by the theory. This paper describes simulation and evolution of SAPF for removing the harmonics. Simulations are done using MATLAB/Simulink Software and results are presented.
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Ram, Saswat Kumar. "FPGA Implementation of digital controller for shunt active power filter to reduce harmonics and reactive power." Thesis, 2011. http://ethesis.nitrkl.ac.in/2714/1/saswat_thesis.pdf.
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Most of the pollution issues created in power systems are due to the non-linear characteristics and fast switching of power electronic equipment. Power quality issues are becoming stronger because sensitive equipment will be more sensitive for market competition reasons, equipment will continue polluting the system more and more due to cost increase caused by the built-in compensation and sometimes for the lack of enforced regulations. Efficiency and cost are considered today almost at the same level. Active power filters have been developed over the years to solve these problems to improve power quality. Among which shunt active power filter is used to eliminate and load current harmonics and reactive power compensation. The active power filter (APF) is implemented with PWM based current controlled voltage source inverter (VSI). This VSI switching signals are generated through proposed three-level hysteresis current controller (HCC) that achieves significant reduction in the magnitude and variation of the switching frequency; it is indicating improved performance compared to 2-level HCC. The shunt APLC system is modeled and investigated under different unbalanced non-linear load conditions using MATLAB programs. The simulation results reveal that the active power filter is effectively compensating the current harmonics and reactive power at point of common coupling. The active power line conditioner system is in compliance with IEEE 519 and IEC 61000-3 recommended harmonic standards. Due to non-linear characteristics the load current gets distorted which causes undesirable effects like heating, equipment damages, EMI effects etc. in power network. The active power filter (APF) is the best solution for eliminating the harmonics caused by the non-linear loads. This work presents the three-phase four-wire active filter for power line conditioning (PLC) to improve power quality in the distribution network and implementation of a digitally controlled APF. Designed in Hardware Description Language (VHDL or VERILOG), the controller becomes independent of process technology. Synchronous reference frame is used for generation of reference current. PI currents algorithm and hysteresis current controller (HCC) together is written in VHDL code and is implemented using FPGA platform. Various simulation results are presented under steady state and transient state condition and performance is analyzed. Simulation results obtained shows that the performance of three phase system with APF is found to be better and digital controller add a new aspect for the controller from low cost, high speed and hardware implementation point.PWM and hysteresis based current control is used to obtain the switching signals to the voltage source inverter(VSI).
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Nanda, P. K. "Power quality improvement in 3-ϕ power system using shunt active filter with synchronous detection method". Thesis, 2014. http://ethesis.nitrkl.ac.in/6148/1/E-67.pdf.
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Active filters with synchronous detection methodologies are vividly employed in distribution system to make sure that the harmonics generated by non-linear loads is reduced and results in less voltage distortion and leads to lesser power superiority problems. The three physical characteristics that mostly underline the power quality and a power quality issues are Voltage, Current and Frequency. Harmonics is defined as a disturbance demonstrated in current or voltage or frequency waveforms which result in devastation, or failure of final equipment. The greater switching frequency as well as the non-linearity in the characteristics of the power electronics equipment is mostly creditworthy for the power quality issue. So significance is being given to the procurement of Active Power Filters to equate these problems to improvise power quality and of all these, shunt active power filter is used to take care of harmonics of voltage and load currents and for reactive power compensating. The shunt active power filters have been built up on the basis of on control strategies like compensation scheme (p-q control) and instantaneous active and reactive current control scheme (Id-Iq control). Taking into consideration its superior quality, an analysis on the Id-Iq control scheme based shunt active filter presented in this project. The compensation is given by the usage of PI based controllers. A theory based study on both the compensation schemes is carried out in the project and then Id-Iq control scheme is implemented in simulation using MATLAB/SIMULINK® work and its harmonic compensation results are analysed. Then synchronous detection scheme algorithms are worked out for unbalanced three phase systems and simulation is done.
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Swain, Sudarshan. "Simulation and Experimental Realization of Adaptive Controllers for Shunt Active Power Filter to improve Power Quality." Thesis, 2015. http://ethesis.nitrkl.ac.in/6664/1/Final_Thesis_(611EE602)_sudarshan_swain.pdf.
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As of late, the demand for electric power is increasing, which has developed a greater demand to maintain a higher level of power quality and continuity of power supply at the consumer end. But increased use of power electronic devices has imperatively degraded the overall power quality of the power system. Due to the non-linear nature of the power electronic devices various current and voltage harmonics are generated, causing harmonic
distortion. These harmonics cause various undesirable effects such as equipment heating, nuisance tripping, overheating transformer, data losses, etc. Shunt Active Power Filters are a viable solution to mitigate these harmonics and thus improve the power quality. In this thesis work, various control strategies of shunt active power filter based on voltage and current controller has been presented to mitigate the current harmonics. To extract the three phase reference source current we have developed control algorithm based on Synchronous reference frame theory (id-iq) and Self Tuning Filter. For regulating the DC capacitor bus voltage various voltage controllers such as PI, PID, Fuzzy and Adaptive Fuzzy PID controllers has been developed. While to generate the gate signal of SAPF multiple current controllers such as Hysteresis band current controller, adaptive hysteresis band current controller, weighted adaptive hysteresis band current controller and Lyapunov
function based stable current controller has been developed. To analyze their performance, simulation models of these controllers have been developed using Matlab/Simulink for different operating conditions. A complete hardware setup of the three phase shunt active
power filter has been developed using dSPACE 1104 to verify the credibility of the proposed controllers.
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Patel, Ranjeeta. "Interleaved Buck Converter Based Shunt Active Power Filter with Shoot-through Elimination for Power Quality Improvement." Thesis, 2017. http://ethesis.nitrkl.ac.in/8646/1/2017_PhD_512EE8011_Ranjeeta_Patel.pdf.
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The “shoot-through” phenomenon defined as the rush of current that occurs while both the devices are ON at the same time of a particular limb is one of the most perilous failure modes encountered in conventional inverter circuits of active power filter (APF). Shoot-through phenomenon has few distinct disadvantages like; it introduces typical ringing, increases temperature rise in power switches, causes higher Electromagnetic Interference (EMI) and reduces the efficiency of the circuit. To avert the “shoot-through”, dead time control could be added, but it deteriorates the harmonic compensation level. This dissertation presents active power filters (APFs) based on interleaved buck (IB) converter. Compared to traditional shunt active power filters, the presented IB APFs have enhanced reliability with no shoot-through phenomenon.
The instantaneous active and reactive power (p-q) scheme and instantaneous active and reactive current component (id-iq) control scheme has been implemented to mitigate the source current harmonics. Type-1 and Type-2 fuzzy logic controller with different membership functions (MFs) viz. Triangular, Trapezoidal and Gaussian have been implemented for the optimal harmonic compensation by controlling the dc-link voltage and minimizing the undesirable losses occurred inside the APF. Additionally, the adaptive hysteresis band current controller (AHBCC) is being implemented to get the nearly constant switching frequency. The performance of the control strategies and controllers for the presented IB APF topologies has been evaluated in terms of harmonic mitigation and dc-link voltage regulation under sinusoidal, unbalanced sinusoidal and non-sinusoidal voltage source condition.
This dissertation is concerned with the different topologies of 3-phase 4-wire IB APFs viz. split capacitor (2C) topology, 4-leg (4L) topology, transformer based full-bridge IB APF or single capacitor based FB IB APF (1C 3 FB IB APF) and full-bridge IB APF (FB IB APF) for low to medium power application. Moreover, APF topology is now being expanded to multilevel VSIs for high power application. Thanks to flexible modular design, transformerless connection, extended voltage and power output, less maintenance and higher fault tolerance, the cascade inverters are good candidates for active power filters with the utility of high power application. The cascaded FB IB APF is modelled with no shoot-through phenomenon by using multicarrier phase shifted PWM scheme. Extensive simulations have been carried out in the MATLAB / Simulink environment and also verified in the OPAL-RT LAB using OP5142-Spartan 3 FPGA to support the feasibility of presented IB APF topologies, control strategies and controllers during steady and dynamic condition. The performance shows that IB-APF topologies bring the THD of the source current well below 5% adhering to IEEE-519 standard. A comparison has also been made, based on SDP (switch device power) between the IB-APF topologies.
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Shih, Cheng-Hsiao, and 石晟孝. "Selective Compensation Strategy Applied in Shunt Active Power Filter Based on IEEE Std. 1459." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/gawm24.
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碩士<br>國立中央大學<br>電機工程學系<br>105<br>This thesis is aimed to achieve the simulation of control harmonic current compensation by shunt active power filter(SAPF). Analyzing harmonic signal through synchronous reference frame (SRF), and estimating the non-efficient powers with IEEE Std.1459-2010.When reference compensating current exceeds the maximum output of SAPF,a selective compensation strategy is applied to eliminate or proportionally reduce the non-efficient powers to improve the efficiency of the SAPF.
In the aspect of power system design, this thesis applies three-phase four-wire system. Through Simulink to simulate nonlinear loads and inter-harmonic load in balanced and unbalanced situations, the signals of voltage and current are extracted at point of common coupling (PCC). With the control strategy proposed in this thesis, the compensation of nonlinear harmonic currents is completed. Finally, the total harmonic current distortion after compensation is analyzed to verify if it is complied with harmonic limitations presented by IEEE Std. 519-2014 and TPC harmonic regulation standards at present.
In the aspect of shunt active power filter design, the eight power switches and one DC storage capacitors are used as the main structure. And hysteresis current control is used to realize the harmonic current compensation.
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Zhan, Hong-Bin, and 詹弘彬. "Implementation of IEEE Standard 1459-based Three-phase Three-wire Shunt Active Power Filter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/pd854h.
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碩士<br>國立中正大學<br>電機工程研究所<br>107<br>With the advanced of power electronics technology and renewables integrated into the network, harmonics pollution caused by power electronic devices, such as power converters, rectifiers, uninterruptible power systems (UPS), etc., is increasing in power system. Harmonics are harmful to many power equipment and cause extra power loss. Therefore, how to mitigate the harmonics and maintain reliable and stable power quality is an important subject.
The active power filter is the most effective and achievable way for harmonics mitigation. The harmonic detection, current control of the active filter determine whether it can effectively suppress harmonic and compensate reactive power. Therefore, this thesis proposes a method of equivalent fundamental positive-sequence voltage based on IEEE standard 1459 as harmonic current detection method of three-phase three-wire shunt active power filter. In the proposed method, even when the source voltage is distorted, the source current is maintain sinusoidal and in phase with the source voltage after compensation. And combined with proportional-resonant (PR) controller, specific harmonic elimination, the inverter is then controlled by space vector pulse width modulation (SVPWM) with low switching loss and low output harmonics.
To validate the performance of IEEE Standard 1459-based reference compensation current strategy of three-phase shunt active power filter, MATLAB/SIMULINK system modeling and simulation have been carried out, choosing TMS320F28335 DSP as control chip and hardware prototypes are developed and tested. Both simulation and experimental results show that the performance of the proposed three-phase three-wire active power filter is well verified.
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Panigrahi, Rakhee. "Development of Robust Control Schemes with New Estimation Algorithms for Shunt Active Power Filter." Thesis, 2015. http://ethesis.nitrkl.ac.in/6918/1/Rakhee_510EE111-PhD_2015.pdf.
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The widespread use of power electronics in industrial, commercial and even residential electrical equipments causes deterioration of the quality of the electric power supply with distortion of the supply voltage. This has led to the development of more stringent requirements regarding harmonic current generation, as are found in standards such as IEEE-519. Power Quality is generally meant to measure of an ideal power supply system. Shunt active power filter (SAPF) is a viable solution for Power Quality enhancement, in order to comply with the standard recommendations. The dynamic performance of SAPF is mainly dependent on how quickly and how accurately the harmonic components are extracted from the load current. Therefore, a fast and accurate estimation algorithm for the detection of reference current signal along with an effective current control technique is needed in order for a SAPF to perform the harmonic elimination successfully. Several control strategies of SAPF have been proposed and implemented. But, still there is a lot of scope on designing new estimation algorithms to achieve fast and accurate generation of reference current signal in SAPF. Further, there is a need of development of efficient robust control algorithms that can be robust in face parametric uncertainties in the power system yielding improvement in power quality more effectively in terms of tracking error reduction and efficient current harmonics mitigation.
The work described in the thesis involves development of a number of new current control techniques along with new reference current generation schemes in SAPF. Two current control techniques namely a hysteresis current control (HCC) and sliding mode control (SMC) implemented with a new reference current generation scheme are proposed. This reference generation approach involves a Proportional Integral (PI) controller loop and exploits the estimation of the in phase fundamental components of distorted point of common coupling (PCC) voltages by using Kalman Filter (KF) algorithm. The KF-HCC based SAPF is found to be very simple in realization and performs well even under grid perturbations. But the slow convergence rate of KF leads towards an ineffective reference generation and hence harmonics cancellation is not perfect. Therefore, a SMC based SAPF is implemented with a faster reference scheme based on the proposed Robust Extended Complex Kalman Filter (RECKF) algorithm and the efficacy of this RECKF-SMC is compared with other variants of Kalman Filter such as KF, Extended Kalman Filter (EKF) and Extended Complex Kalman Filter (ECKF) employing simulations as well as real-time simulations using an Opal-RT Real-Time digital Simulator. The RECKF-SMC based SAPF is found to be more effective as compared to the KF-HCC, KF-SMC, EKF-SMC and ECKF-SMC.
Subsequently, predictive control techniques namely Dead Beat Control (DBC) and Model Predictive Control (MPC) are proposed in SAPF along with an improved reference current generation scheme based on the proposed RECKF. This reference scheme is devoid of PI controller loop and can self-regulate the dc-link voltage. Both RECKF-DBC and RECKF-MPC approaches use a model of the SAPF system to predict its future behavior and select the most appropriate control action based on an optimality criterion. However, RECKF-DBC is more sensitive to load uncertainties. Also, a better compensation performance of RECKF-MPC is observed from the simulation as well as real-time simulation results. Moreover, to study the efficacy of this RECKF-MPC over PI-MPC, a comparative assessment has been performed using both steady state as well as transient state conditions. From the simulation and real-time simulation results, it is observed that the proposed RECKF-MPC outperforms PI-MPC. The thesis also proposed an optimal Linear Quadratic Regulator (LQR) with an advanced reference current generation strategy based on RECKF. This RECKF-LQR based SAPF has better tracking and disturbance rejection capability and hence RECKF-LQR is found to be more efficient as compared to RECKF-SMC, RECKF-DBC and RECKF-MPC approaches.
Subsequently, two robust control approaches namely Linear Quadratic Gaussian (LQG) servo control and H∞ control are proposed in SAPF with highly improved reference generation schemes based on RECKF. These control strategies are designed with the purpose of achieving stability, high disturbance rejection and high level of harmonics cancellation. From simulation results, they are not only found to be robust against different load parameters, but also satisfactory THD results have been achieved in SAPF. A prototype experimental set up has been developed in the Laboratory with a dSPACE-1104 computing platform to verify their robustness. From both the simulation and experimentation, it is observed that the proposed RECKF-H∞ control approach to design a SAPF is found to be more robust as compared to the RECKF-LQG servo control approach in face parametric uncertainties due to load perturbations yielding improvement in power quality in terms of tracking error reduction and efficient current harmonics mitigation. Further, there is no involvement of any voltage sensor in this realization of RECKF-H∞ based SAPF resulting a more reliable and inexpensive SAPF system. Therefore, superiority of proposed RECKF-H∞ is proved amongst all the proposed control strategies of SAPF.
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Tsai, Chin-Chu, and 蔡金助. "An Implementation of Series-type Active Filter for Power Quality Conditioning." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/33289167650373715159.
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碩士<br>國立臺灣大學<br>電機工程學研究所<br>90<br>Because a bulk smoothing capacitor is usually installed on the DC side of many AC to DC converters, the characteristics of harmonic loads will be changed by this capacitor. Nowadays, shunt active power filters can’t reduce harmonics effectively for this voltage type harmonics-producing load. Therefore, in this thesis, a series active power filter (APF) is designed to meet the requirement of voltage-sourced harmonic loads. Both source current and load voltage are detected in order to reach the compensation voltage for the series APF.
The other objective is to use series type active power filter for load voltage regulation. A novel algorithm based on synchronous axis transformation method is proposed to calculate the reference signal for the compensation voltage in a very efficient manner. The designed series type APF can be used to compensate for voltage sag, and voltage unbalance very effectively.
A new digital signal processor (DSP) based control method for active power filter is presented. Compared to conventional analog and microprocessor based methods, the DSP based solution provides a flexible and cheaper method to control the APF. The PSCAD simulations and experiments using the DSP controller are performed to verify the effectiveness of series active power filter in reducing harmonic currents and regulating load voltage.
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Jena, Shyamsundar. "MATLAB simulation of single phase shunt active power filter and development of experimental set up." Thesis, 2014. http://ethesis.nitrkl.ac.in/6376/1/E-29.pdf.
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This project work presents a single phase shunt active power filter based on synchronous detection method. Due to wide use of nonlinear single phase power electronic devices in low voltage side has increased harmonic pollution in the power system to the larger extent. Improving power quality has become the biggest challenge for electrical engineers. A single phase shunt active power filter was modeled in MATLAB/SIMULINK using hysteresis current controller and triangular current controller. Simulation results are presented to demonstrate performance of single phase shunt active power filter during presence of nonlinear load. An experimental setup is established to validate the simulation result.
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Hsu, Chen-Lin, and 許陳霖. "Design of Shunt Active Power Filter Based on Adaptive Linear Filtering and Frequency Detection Method." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14178674313671885625.
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碩士<br>國立中央大學<br>電機工程學系<br>104<br>This thesis is aimed to achieve the simulation of control harmonic current compensation by shunt active power filter. When analyzing harmonic signal through adaptive linear filtering (ADALINE), the estimation accuracy of phase angle would be easily reduced due to power system frequency deviation. Therefore, the model of improved ADALINE with the frequency detection method is proposed to overcome this problem and then perform the compensation control.
In the aspect of power system design, this thesis applies three-phase four-wire system. Through Simulink to simulate nonlinear loads and inter-harmonic load in balanced and unbalanced situations, the signals of voltage and current are extracted at point of common coupling (PCC). With the control strategy proposed in this thesis, the compensation of nonlinear harmonic currents is completed. Finally, the total harmonic current distortion after compensation is analyzed to verify if it is complied with harmonic limitations presented by IEEE Std. 519-2014 and TPC harmonic regulation standards at present.
In the aspect of shunt active power filter design, the six power switches and two DC storage capacitors are used as the main structure. And hysteresis current control is used to realize the harmonic current compensation.
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Wu, Dong-Yi, and 吳東益. "T-S Fuzzy Controller Design Based on LMI for a shunt Active Power Filter System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/73277303980853651717.
Full textAbstract:
碩士<br>國立中央大學<br>電機工程研究所<br>95<br>This thesis offers an effective solution which mainly improves the harmonic problem of active power filter. In the past, most shunt active power filters use proportional integral and differential (PID) controller. When using fixed-gain PID controllers, it is necessary to retune the parameters for different operation conditions. Therefore, we propose a T-S fuzzy controller for a single-phase shunt active power filter to improve line power factor and reduce line current harmonics. Furthermore, the capability of shunt active power filter is able to control the supply current to be a sinusoidal wave with low current harmonics and in phase with the line voltage. The T-S fuzzy modeling and the so-called parallel distributed compensation is employed to design fuzzy controllers from the T-S fuzzy models. For the designed fuzzy control systems based on Lyapunov stability theory, the problem of finding stable feedback gains and a common Lyapunov function are solved by linear matrix inquality. Finally, simulation and experimental results show that the system performance, such as power factor and total harmonic distortion, has been much improved.
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Mongam, Harish Dora. "Performance Analysis of Shunt Active Power Filter (SAPF) using p-q and d-q theories." Thesis, 2018. http://ethesis.nitrkl.ac.in/9886/1/2018_MT_216EE5320_HMongam__Performance_Analysis_of_Shunt_.pdf.
Full textAbstract:
In general, large usage of power electronic based equipment introduces the harmonics in the distribution system. Hence, the nonlinear loads of industrial and domestic introduce the nonlinearity in the distribution system. Because of these nonlinear loads, the system voltage and current waveforms getting distort since the nonlinear loads introduces the harmonic content in the source consequently the power factor of the source reduces. These harmonics along with the less power factor causes various problems such as increases the losses in the transmission, distribution systems, overheating of transformers and motors, flickering effect in florescent tubes and operational failure of protective relaying etc. To reduce the harmonic currents in the power system and maintain the power quality, a Shunt active power filter (SAPF) based on p-q and d-q theories is used. Here, p-q theory has Clarke transformation for extracting the reference currents whereas the d-q theory consists of Park transformation along with the phase locked loop (PLL). The DC link voltage is regulated by using the PI and fuzzy logic controllers. Moreover, hysteresis current control technique is used to drive the voltage source inverter (VSI) and the shunt active power filter based on p-q and d-q theories for different DC link control strategies such as PI and Fuzzy under steady state and load variation is simulated in MATLAB.
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Chen, W. C., and 陳偉成. "Optimization-Based Reference Compensation Voltage Strategies for Series Active Power Filter Control." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/23853770959784537865.
Full textAbstract:
碩士<br>國立中正大學<br>電機工程研究所<br>93<br>Due to the widespread use of nonlinear loads nowadays, problems associated with poor power factor, source voltage distortion and unbalance are of great concerns. Furthermore, in many industrial power systems, source voltages may be distorted and imbalanced. Therefore, how to improve power quality and to provide a stable supply voltage become more important. This thesis proposes three reference compensation voltage control strategies to keep load voltage being sinusoidal and balance under the distorted and/or imbalanced source voltages. The positive-sequence load currents control strategy is proposed to have a simpler design of the APF control. Two optimal reference compensation voltage control strategies are proposed to determine the series APF injections to meet different constraints with an optimal APF size. The individual and total harmonic voltage distortion limits, APF active power consumption/generation, levels of voltage imbalance, and the size of the APF can be taken into account. Results show the proposed approach is effective in controlling series APF for harmonic voltage and reactive power compensation. The new reference compensation voltage control strategies are very suitable for planning the series APF or other custom power devices when several alternate objectives and constraints are under considerations.
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Majhi, Biswabharati. "Design of a Shunt Active Power Filter with Grid Connected Inverter Control for a Photovoltaic System." Thesis, 2015. http://ethesis.nitrkl.ac.in/7670/1/2015_Design_Majhi.pdf.
Full textAbstract:
In this thesis, a shunt active filter (SAF) has been designed for a PV system. Due to the presence of nonlinear load and the inverter connected to the photovoltaic system, harmonics appear in the load current. Hence, to reduce the harmonics, a shunt active filter is connected between the inverter and the load at the point of common coupling. The power quality is improved by reducing the THD. The SAPF connected to PV system has been implemented using MATLAB/SIMULINK. From the obtained results, it is seen that the PV system with shunt active filter provides reduced THD. Further, the inverter control for integrating the PV system to the grid is presented. The three phase inverter works as a multi-functional device and it is used to supply the power to the grid as power converter as well as harmonic eliminator. The inverter control has simulated using MATLAB/SIMULINK. This control strategy incorporates PQ solution as in shunt active power filter technique to reduce harmonics in the current due to non-linear loads in the system and also the THD value is reduced
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Mikkili, Suresh. "Performance Analysis of Type-1 and Type-2 FLC based Shunt Active Filter Control Strategies for Power Quality Improvement." Thesis, 2013. http://ethesis.nitrkl.ac.in/5479/1/Suresh_Mikkili___Ph.D_Thesis_Revised_on_22-06-2013.pdf.
Full textAbstract:
In recent years electrical power quality has been an important and growing problem
because of the proliferation of nonlinear loads such as power electronic converters in typical
power distribution systems. Particularly, voltage harmonics and power distribution equipment
problems result from current harmonics produced by nonlinear loads. The electronic
equipments like; computers, battery chargers, electronic ballasts, variable frequency drives,
and switch mode power supplies, generate perilous harmonics and cause enormous economic
loss every year. Problems caused by power quality have great adverse economic impact on
the utilities and customers. Due to that both power suppliers and power consumers are
concerned about the power quality problems and compensation techniques.
Issue of harmonics are of a greater concern to engineers and building designers because
harmonics can do more than distort voltage waveforms, they can overheat the building
wiring, causes nuisance tripping, overheat transformer units, and cause random end-user
equipment failures. Thus power quality (PQ) has become more and more serious with each
passing day. As a result active power filter (APF) gains much more attention due to excellent
harmonic and reactive power compensation in two-wire (single phase), three-wire (threephase
without neutral), and four-wire (three-phase with neutral) ac power networks with
nonlinear loads. The APF technology has been under research and development for providing
compensation for harmonics, reactive power, and/or neutral current in ac networks. Current
harmonics are one of the most common power quality problems and are usually resolved by
the use of shunt active filters.
In this research work, the performance of the shunt active filter control strategies has been
evaluated in terms of harmonic mitigation and DC link voltage regulation. Three-phase
reference current waveforms generated by proposed scheme are tracked by the three-phase
voltage source converter in a hysteresis band control scheme. This research presents different
topologies and controllers with enhanced performance of shunt active filter for power quality
improvement by mitigating the harmonics and maintaining dc link voltage constant.
For extracting the three-phase reference currents for shunt active power filters, we have
developed shunt active filter Instantaneous active and reactive power “p-q” and
Instantaneous active and reactive current “Id-Iq” control strategies. For regulating and
maintaining the DC link capacitor voltage constant, the active power flowing into the active
filter needs to be controlled. In order to maintain DC link voltage constant and to generate the
compensating reference currents, we have developed PI Controller, Type-1 and Type-2 Fuzzy
logic controller with different Fuzzy MFs (Trapezoidal, Triangular and Gaussian). The
proposed APF is verified through MATLAB/SIMULINK. The detailed real-time results using
Real-time digital simulator are presented to support the feasibility of proposed control
strategy.