To see the other types of publications on this topic, follow the link: Three leg three phase inverter.
Dissertations / Theses on the topic 'Three leg three phase inverter'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Three leg three phase inverter.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Zhang, Min. "Investigation of switching schemes for three-phase four-leg voltage source inverters." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2319.
Full textAbstract:
Three-phase four-leg voltage source inverters (VSIs) are widely used in distributed power generation applications, three-phase UPS systems and fault-mode operation of a balanced three-phase system where the balanced three-phase voltage output is required when the loads are unbalanced. A three-dimensional space vector modulation (3-D SVM) switching scheme, which is proved to be compatible with modern DSP implementation for a four-leg VSI, has the advantage of higher DC link utilization, less harmonic contents and less switching losses compared with sinusoidal PWM. Therefore it is the first choice of switching schemes for a four-leg inverter. Electromagnetic interference (EMI) which is associated with common-mode switching for a high voltage level power system can degrade the equipment performance and cause communication problems. The conventional 3-D SVM switching scheme exhibits high common-mode voltage (CMV) characteristics which may result in problems in high power applications. The 3-D SVM has the drawback of being complex which could become a software burden in computationally intense real-time control applications. Attempts to reduce the complexity of the 3-D SVM have been made by many researchers and new switching schemes such as carrier-based PWM proved to have the same performance. This thesis presents a switching scheme called near-state 3-D SVM that can reduce the CMV voltage level of a four-leg inverter by avoiding the use of the two zero switching states of the inverter. A laboratory test bench has been built to validate the proposed switching scheme. An in-depth analysis has been carried out for a four-leg inverter in terms of total harmonic distortion (THD) factor, current harmonic distortion factor, conduction losses and switching losses. The proposed switching scheme is analyzed and compared with the conventional 3-D SVM using the analysis method. Additionally, a simplified switching scheme which is still based on space vector theory is proposed. This simplified switching scheme remains compatible with vector control. Experimental results show that the simplified switching scheme has the same performance as 3-D SVM, with reduced program execution time. Abstract iii An output voltage control loop with current feed-forward term in d-q-0 coordinate, which is designed in the discrete-time domain, proves to be most compatible with a DSP-based control system. Experimental results demonstrate the performance of the control loop in both steady state and transient operation.
2
Demirkutlu, Eyyup. "Output Voltage Control Of A Four-leg Inverter Based Three-phase Ups By Means Of Stationary Frame Resonant Filter Banks." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608151/index.pdf.
Full textAbstract:
A method for high performance output voltage control of a four-leg inverter based three-phase transformerless UPS is proposed. Voltage control loop is employed and the method employs stationary frame resonant filter controllers for the fundamental and harmonic frequency components. A capacitor current feedback loop provides active damping and enhances the output voltage dynamic performance. The
controller design and implementation details are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The steadystate
and dynamic performance of the UPS are investigated in detail. A scalar PWM method with implementation simplicity and high performance is proposed and implemented. The control and PWM methods are proven by means of theory,
simulations, and experiments.
3
Žůrek, Tomáš. "Řízení trojfázového sinusového zdroje." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220914.
Full textAbstract:
This thesis deals with control of three phase inverter as three phase sinusoidal voltage source for UPS application. Thesis is split to two parts, teoretical and practical. Teoretical part deals with three phase inverter topology analysis according requirement of neutral line wire and possibilities of generating sinusoidal PWM in depend of topology. There are also analysed properties of contorled system and designed 3 regulation methods with simulations. Second part of thesis deals with realisation of sinusoidal power source with inverter borrowed by Elcom company. To inverter control is used digital signal controler TMS320F28335 with implemented control algorithms. There are also presented the measurement results of the prototype of power source. In conclusion, simulation results are compared with measurements and achieved results are summarized.
4
Pinto, Lázaro Rubens Araújo. "Aplicação de controlador preditivo baseado em modelo (MPC) para sistema de geração distribuída constituído por inversor trifásico a quatro braços." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/7853.
Full textAbstract:
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-10-06T12:04:38Z
No. of bitstreams: 2
Dissertação - Lázaro Rubens Araújo Pinto - 2017.pdf: 16272237 bytes, checksum: 9f3d1693d0282cbf28a35702c1a9cf17 (MD5)
license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-10-06T12:04:51Z (GMT) No. of bitstreams: 2 Dissertação - Lázaro Rubens Araújo Pinto - 2017.pdf: 16272237 bytes, checksum: 9f3d1693d0282cbf28a35702c1a9cf17 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
Made available in DSpace on 2017-10-06T12:04:52Z (GMT). No. of bitstreams: 2 Dissertação - Lázaro Rubens Araújo Pinto - 2017.pdf: 16272237 bytes, checksum: 9f3d1693d0282cbf28a35702c1a9cf17 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-08-07
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
This work proposes an analysis of the closed-loop operation of a distributed generation system connected to a three-phase four-wire AC power system by a three-phase four-leg inverter. The modulation strategy adopted for this inverter is determined by the Model Predictive Control (MPC) method. Reasons for the use of this topology and the control method are discussed. The chosen structure for the MPC predictive control aims to supply of active and reactive power by the inverter in order to maximize the power factor measured by the four-wire AC source (Y-n). Four possible cases of operation are reported for the analysis of the proposal in the three-phase four-leg inverter and other two cases for a three-phase full-bridge inverter (3F) for comparison purposes. Based on the monitoring of the active powers involved and the other variables of interest, it was possible to exemplify the achievement of the proposed objectives and validate the adopted method, at least under modeling and software simulation level.
Este trabalho propõe uma análise da operação em malha fechada de um sistema de geração distribuída para conexão em um sistema trifásico a quatro fios, a partir do controle de um inversor trifásico a quatro braços. A estratégia de modulação adotada para este inversor é determinada pelo método de controle preditivo baseado em modelo (MPC - Model Predictive Control). Justificativas para a utilização dessa topologia e do método de controle são discutidas. A estrutura escolhida para o controle preditivo MPC objetiva o fornecimento de potência ativa e reativa pelo inversor tendo em vista a maximização do fator de potência medido a partir da fonte pela fonte CA a quatro fios (Y-n). Quatro casos são abordados para análise da proposta no inversor trifásico a quatro braços e dois casos para um inversor trifásico em ponte completa (3F) para efeito de comparação. Baseando-se no monitoramento das potências elétricas envolvidas e nas demais grandezas de interesse, foi possível concluir que os resultados de simulações exemplificam o alcance dos objetivos propostos e validam o método adotado, pelo menos em relação à modelagem matemática empregada e à simulação do sistema de geração proposto em ambiente computacional.
5
Wheaton, Daniel G. "Coherent noise rejection in a three-phase power inverter." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5630.
Full textAbstract:
Approved for public release; distribution is unlimited.In this thesis, we discuss the design of a controller to reject the effects of high order harmonics in a three-phase power inverter. Specifically, coherent noise in the fifth harmonic is considered, as it seems to be dominant in most applications. The controller used in this power inverter operates in a reference frame synchronous with the 60 Hz line voltage. This transformation effectively changes the desired 60 Hz sine wave output into a DC value that has the same amplitude as the sine wave. The power inverter uses an optimal form of pulse-width modulation (PWM), called space vector modulation, which causes the harmonic noise. In order to reject the distortions introduced by the space-vector modulation process, a Linear Quadratic Gaussian (LQG) controller is designed with the sinusoidal disturbances modeled as uncontrollable modes of the system, which are observable from the input and output signals. The extra states in the state space model associated with the disturbance are estimated by the Kalman Filter and subtracted from the control input to compensate for the disturbance
6
Amadasu, Henry O. "Development of three-phase source inverter for research and laboratories." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5816.
Full textAbstract:
Approved for public release; distribution is unlimited.s focused on in this thesis. The development of a three-phase VSI, the thermal and power loss analysis of a three-phase VSI and the hardware interface between the FPGA and the three-phase VSI used for research and laboratory procedures at NPS are particularly concentrated on.
7
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.
Full textAbstract:
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.
8
Yatim, Abdul Halim bin Mohamed. "A microprocessor controlled three-phase insulated gate transistor PWM inverter drive." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292639.
Full text
9
Alolah, A. I. "Microprocessor controlled three-phase inverter for variable-speed induction motor drive." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371466.
Full text
10
White, Terence H. "A three-phase hybrid dc-ac inverter system utilizing hysteresis control." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FWhite%5FTerence.pdf.
Full text
11
Jacobs, D. M. (Danver Maxwill). "Voltage control of medium to high power three-phase inverter supply systems." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52608.
Full textAbstract:
Thesis (MScEng)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: In this thesis a new voltage control method is developed for a three-phase inverter supply system. The inverter supply system consist of a Permanent Magnet Generator, a three-phase rectifier, a three-phase inverter plus LC-filter and a three-phase transformer in series. This system supplies power to a network or to a stand-alone load. The main focus of this thesis is on the control aspects of the inverter and the LC-filter. Different voltage control systems are investigated and compared to each other. From these methods the proposed voltage control method is developed where only the output voltages are measured to establish good voltage control. All these voltage control methods are also simulated with a software package. The proposed voltage control method compares very well with other voltage control methods. The results that are obtained in the simulations are satisfactory. The proposed voltage control method is also implemented in an 8 kW laboratory scale model and, again, very good practical results are obtained. A TMS320F240 nsp controller is used to implement the proposed voltage control method. The controller compensates well for load steps, and these results compare well to an alternative voltage control method, which was also evaluated practically.
AFRIKAANSE OPSOMMING: In hierdie tesis IS 'n nuwe spanningsbeheermetode ontwikkel VIr 'n drie-fase wisselrigter kragtoevoerstelsel. Die wisselrigter kragtoevoerstelsel bestaan uit 'n Permanent Magneet Generator, 'n drie-fase gelykrigter, 'n drie-fase wisselrigter plus Le-filter, en 'n drie-fase transformator in serie. Hierdie stelsel voorsien krag aan 'n netwerk sowel as aan 'n alleenstaande las. Die hooffokus van hierdie tesis is op die beheeraspekte van die wisselrigter en Le-filter. Verskillende spanningsbeheermetodes is deeglik ondersoek en vergelyk met mekaar. Uit hierdie metodes is dan die voorgestelde beheermetode ontwikkel waar slegs die uittreespanning gemeet word om goeie spanningsbeheer te kan doen. Al hierdie spanningsbeheermetodes is dan gesimuleer met 'n sagteware pakket. Die voorgestelde spanningsbeheermetode vergelyk baie goed met die ander spanningsbeheermetodes. Die resultate verky in die simulasies is ook baie bevredigend. Die voorgestelde beheermetode is ook geïmplementeer op 'n 8 kW laboratorium skaalmodel en weereens is baie goeie praktiese resultate verky. 'n TMS320F240 DSP-beheerder is gebruik om die voorgestelde beheermetode mee te implementeer. Die beheerder kompenseer baie goed vir lastrappe en vergelyk ook goed met 'n ander spanningsbeheermetode wat prakties ge-evalueer is.
12
Ad'doweesh, K. E. "A microprocessor based PWM inverter drive incorporating a three-phase induction motor." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371459.
Full text
13
Engku, Ariff E. A. R. B. "Space vector Pwm techniques for six-phase three-level inverter-fed drives." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/7982/.
Full textAbstract:
In recent years, research in the area of multiphase drives has increased significantly. Having higher number of machine phases allows the current to be shared between the phases, thus reducing the current rating of power semiconductors used in the power converter. Additionally, if a multilevel inverter is used to drive the machine, the output voltage waveforms are going to be approximated closer toward sinusoidal waveforms, thus resulting in lower total harmonic distortion. Therefore, the combination of multiphase and multilevel technologies gives considerable benefits compared to conventional two-level three-phase drives. Unlike a carrier-based approach, which can be easily expanded to any number of converter voltage levels and any number of machine phases, the development of space vector algorithms is also reliant on the machine’s configuration. In other words, different drive topologies require their own unique space vector algorithms. In fact, the complexity of developing a space vector algorithm will dramatically increase with the increase of number of levels and/or number of phases. This thesis presents pulse width modulation techniques for two- and three-level asymmetrical and symmetrical six-phase drives with a single or two isolated neutral points configuration. However, since the modulation techniques for the drives with two isolated neutral points are based on the well-established modulation techniques for three-phase drives, more emphasis is given towards the development of modulation techniques for single neutral point case, particularly those that are based on space vector algorithm principles. In order to realise sinusoidal output phase voltage waveforms, several requirements and conditions have to be met. The requirements revolve around ensuring that the low order harmonics, which contribute to the machine losses, will not exist. Meanwhile, the conditions are more towards minimising the switching losses. All modulation techniques are verified through simulation, while those for three-level case are validated experimentally as well. Comparison and discussion of obtained simulation and experimental results, performance and complexity in terms of execution time of the developed modulation techniques, are presented. The equivalence between corresponding modulation techniques, which are based on the space vector algorithm and carrier-based approach are also established.
14
Hussien, Zahrul Faizi. "Current control of three-phase PWM Inverter for flywheel energy storage system." Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/47946/.
Full textAbstract:
The thesis is concerned with the use of flywheel energy storage system (FESS) in utility load levelling application. The work presented consists of two parts, first, an evaluation of utility load levelling schemes with FESS as the energy storage medium, and second, the development of power electronic interface of FESS to the utility. The thesis presents a study to evaluate FESS load levelling schemes in a UK electricity supply and distribution company. It identifies and quantifies the costs and benefits of the schemes, and carries out a financial appraisal based on Net Present Value (NPV) and Internal Rate of Return (IRR) methods. The results indicate that the DSM schemes utilising FESS can be financially viable for a UK electricity supply and distribution business in a mass-produced (low-cost) FESS scenario, and provide FESS manufacturers and developers with cost goals for such applications. The conclusions drawn provide the motivation for further technical research undertaken within the programme of work. The main work presented is in the area of power electronic interface between FESS, as well as other energy storage devices or energy sources, and the utility for embedded generation. The thesis particularly focuses on the design of current controllers for an interface in the form of three-phase voltage-source pulsewidth modulated (VS-PWM) inverter connected to the utility via LCL filter. Two different current controller structures based on suboscillation current control method have been analysed and designed, aided by computer simulation studies carried out using a general purpose dynamic system simulation software, Matlab Simulink. General properties of a three-phase VS-PWM inverter have been investigated to establish a basic understanding of its operation. The phenomenon of phase interaction in a system with no neutral connection has been examined and the effect of practical inverter nonlinearities caused by interlock time delay (dead time) and on-state voltage drops of the semiconductor devices has been discussed. Various PWM current control techniques have been investigated, including the three-independent hysteresis current control, advanced hysteresis current control, suboscillation current control and space vector current control. The suboscillation current control method has been chosen as produces a well defined harmonic spectrum in the output current without the need for complicated computations and extensive hardware, and can be easily implemented in analogue to avoid problems •sampling and computation time delay generally associated with digital controllers. Fundamental appreciation of the suboscillation PWM technique has been established from analytical synthesis of the modulation process, providing a rational basis for the current controller and computer simulation model validation. An inherent disadvantage of the suboscillation control method has been found to be its limited controller gain, causing a steady-state error to and the effect of inverter nonlinearities to be quite significant. In the first current controller structure, a simple compensation has been utilised to enable the gain to be increased beyond the conventional limit. Simulation results show that the steady-state error the current waveform has been improved and the effect of inverter nonlinearities has been It also makes the current controller less susceptible to the inherently noisy environment, current controller has been experimentally built and tested to validate the simulation results and to validate the practical aspects of its implementation. In the second current controller structure, a cyclic feedback system based on Iterative Control (ILC) has been utilised to eliminate the periodic error in the current waveform. The structure is more complicated and the cyclic feedback system requires digital implementation. Simulation results indicate that the cyclic feedback system is effective in eliminating periodic error in the current waveform. Due to time constraints and hardware limitations, ital implementation of the system has not been possible but is recommended for future research.
15
Ayhan, Ufuk. "Investigation Of Dc Bus Current Harmonics In Two And Three Level Three-phase Inverters." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614182/index.pdf.
Full textAbstract:
Within scope of this work, double-fourier analysis method of rapid calculation and
detailed simulation method, which are used to investigate DC bus current harmonics
in two level and three level three-phase inverters systematically, will be emphasized
and two methods will be compared via applying different modulation techniques. In
addition, DC bus currents will be investigated visually for various working
conditions and modulation methods. After that, analysis methods will be applied
and harmonic spectrums will be determined. After all, it will be showed that
calculated harmonic spectrums could be treated as unified harmonics around certain
frequencies and these unified harmonics could be reached easily via looking at
predetermined table. Moreover, it will also be showed that unified harmonic values
could be used to determine harmonic current components that are necessary for
sizing DC bus capacitor and could be used in various inverter analysis.
16
Andrews, Darin M. "Direct torque control of a three-phase voltage source inverter-fed induction machine." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/38872.
Full textAbstract:
Approved for public release; distribution is unlimited.The scope of this thesis involves various techniques to control the torque of a voltage source inverter-fed induction motor. The three methods investigated here are voltage by frequency, known as scalar control, field-oriented control with and without space vector modulation, and direct torque control. Although all three techniques have been proven effective, each technique possesses its own advantages and disadvantages. In todays engineering world, time and money are saved by utilizing software developed to accurately model a physical system and to compare with hardware previously implemented in a lab. Comparisons can be made to determine how each of these torque control methods perform under static and dynamic modes of operation. The United States military can benefit from this study by modifying or adding onto the software models developed here with little cost and use these models to do trade studies without the cost of lab demonstrations.
17
Althobaiti, Ahmed Othman. "Proportional resonant control of three-phase grid-connected inverter during abnormal grid conditions." Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/3987.
Full textAbstract:
The development of using grid-connected three-phase inverter has augmented the standing of realizing muted distortion along with high-quality current waveform. The standard three-phase grid-connected inverter is the full-bridge voltage source inverter. This inverter is usually controlled by proportional integral (PI) controller in order to ensure sinusoidal current injection to the grid. Although the PI controller is well established and easy to use under normal grid conditions, it leads to system instability under abnormal grid conditions. When abnormal grid conditions are likely to occur, the control system with PI controller can be configured to include two separate PI controllers for the positive and negative sequence components of the grid current. However, this increases control complexity and total harmonic distortion (THD). More recently, the proportional resonant (PR) controller started to replace PI controller in a different application including grid-connected current control. In this thesis, a comprehensive theoretical and experimental comparison between the PI and PR controllers is presented. The comparison shows that the PR controller offers lower total harmonic distortion (THD) in the current signal spectrum and is simpler to implement as it uses only the positive sequence component of the grid current and consequently only one PR controller is needed. For these reasons, the PR controller is adopted in this thesis. Despite the PR controller offering enhanced functioning under abnormal grid conditions compared to PI controller, a sudden change in the grid voltage could additionally raise the error between the reference signal and the controlled signal which results in causing significant divergence from its ostensible value. In this case, the performance of the conventional PR controller will not keep up with the increase in the error which weakens controller performance. To overcome this problem, a new design concept for controlling the current of the three-phase grid connected inverter during normal and abnormal conditions is presented in this thesis. The proposed technique replaces the static control parameters by adaptive control parameters based on a look-up table. This adaptive PR, controller has been investigated and demonstrated with different normal and abnormal grid conditions. The proposed control technique is capable of providing low THD in the injected current even during the occurrence of abnormal grid conditions compared with PI and PR controllers. It also achieves lower overshoot and settling time as well as smaller steady-state error. Proportional Resonance Control of Three-Phase Grid-Connected Inverter II Additionally, despite the fact that both PI and PR controllers are relatively straightforward to tune, and are sometimes capable of dealing with many time-varying grid conditions. This research also presented an adaptive controller tuned using advanced optimization techniques based on particle swarm optimisation (PSO). PSO is presented to optimize the control parameters of both PI and PR controllers for the three-phase grid-connected inverter. There are many advantages of using PSO, such as no additional hardware being required. Thus, it can be extended to other applications and control methods. In addition, the proposed method is a self-tuning method and can thus be suitable for industrial applications where manual tuning is not recommended for time and cost reasons. Simulation and experimental test were carried out to investigate the performance of the proposed techniques. In the simulation, the system was tested under 100 kW model using Matlab/Simulink environment. In addition, the system was also investigated through a practical implementation of the control system using a Digital Signal Processor (DSP) and grid-connected three-phase inverter. This practical system was demonstrated a 300 W scaled-down prototype. As a result, the comparisons between experimental and simulation results show the behaviour and performance of the control to be accurately evaluated.
18
Muhsen, Hani. "Three-Phase Voltage Source Inverter with Very High Efficiency Based on SiC Devices." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-199329.
Full textAbstract:
This dissertation aims at designing a three-phase voltage source inverter based on the SiC devices and mainly the SiC-MOSFET. The designed inverter offers a possibility to drive the power inverter with a very high efficiency, which can reach up to 99% for 16 kW rated power. The design is dedicated to the electric vehicle application, and it aims at
• Providing a comparative study on some of the current discrete SiC devices in terms of the total losses and the thermal conductivity. In addition, a behavioral study of the effective channel mobility with temperature variation in the SiC MOSFET will be investigated.
• Designing a gate driver which fits with the driving requirements of the SiC-MOSFET and provides a trade-off between the switching losses and the EMI behavior.
• Designing a three-phase voltage source inverter with 16 kW rated power; the design includes minimizing the inverter losses and extracts the EMI model of the power inverter by considering the effects of the parasitic parameters; moreover a short guideline for selecting the heat-sink based on the static network is introduced.
• Proposing a new and simplified carried-based PWM, this will reduce the harmonics in the output waveforms and enhance the utilization of the DC-link voltage.
• Proposing a new strategy for compensating the dead-time effect in carrier based-PWM and to find out the proper dead-time level in VSI based on SiC –MOSFET.
• Designing faults diagnosis and protection circuits in order to protect the power inverter from the common faults; overcurrent, short-circuit, overvoltage, and overtemperature faults.
19
Ye, Zhihong. "Modeling and Control of Parallel Three-Phase PWM Converters." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29476.
Full textAbstract:
This dissertation studies modeling and control issues of parallel three-phase pulse-width modulated (PWM) converters. The converters include three-phase boost rectifiers, voltage source inverters, buck rectifiers and current source inverters.
The averaging of the parallel converters is performed based on a generic functional switching unit, which is called a phase leg in boost rectifiers and voltage source inverters, and a rail arm in buck rectifiers and current source inverters. Based on phase-leg and rail-arm averaging, the developed models are not only equivalent to the conventional three-phase converter models that are based on phase-to-phase averaging, but they also preserve common-mode information, which is critical in the analysis of the parallel converters. The models reveal such parallel dynamics as reactive power circulation and small-signal interaction.
A unique feature of the parallel three-phase converters is a zero-sequence circulating current. This work proposes a novel zero-sequence control concept that uses variable zero-vectors in the space-vector modulation (SVM) of the converters. The control can be implemented within an individual converter and is independent from the other control loops for the converter. Therefore, it greatly facilitates the design and expansion of a parallel system.
Proper operation of the parallel converters requires an explicit load-sharing mechanism. In order to have a modular design, a droop method is recommended. Traditionally, however, a droop method has to compromise between voltage regulation and load sharing. After parametric analysis, a novel droop method using a gain-scheduling technique is proposed. The numeric analysis shows that the proposed droop method can achieve both good voltage regulation and good load sharing.
An interleaving technique is often used in parallel converter systems in order to reduce current ripples. Because of its symmetrical circuit structure, the parallel three-phase converter system can reduce both differential-mode and common-mode noise with a center-aligned symmetrical SVM.
Based on the concept that a symmetrical circuit can reduce common-mode dv/dt noise, a conventional three-phase, four-leg inverter is modified so that its fourth leg is symmetrical to the other three legs. The common-mode dv/dt noise can be practically eliminated with a new modulation strategy. Meanwhile, with a modified control design, the new four-leg inverter still can handle low-frequency common-mode components that occur due to unbalanced and nonlinear load.Ph. D.
20
Un, Emre. "Common Mode Voltage And Current Reduction In Voltage Source Inverter Driven Three Phase Ac Motors." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609062/index.pdf.
Full textAbstract:
In this thesis various reduced common mode voltage (RCMV) pulse width modulation (PWM) techniques and active/passive common mode voltage (CMV) reduction methods for voltage source inverter driven three-phase AC motors are theoretically and practically investigated. A novel RCMV-PWM method, the near state PWM (NSPWM) method is proposed for operation at high modulation index. At low modulation index, a modified version of an existing RCMV-PWM method, AZSPWM1, termed as MAZSPWM, is proposed to mitigate the voltage reflection problem of the method. An optimum modulation algorithm combining NSPWM and MAZSPWM with seamless transition is proposed. The proposed RCMV-PWM methods significantly reduce CMV but they suppress common mode current (CMC) partially. Utilization of a common mode inductor together with RCMV-PWM methods is effective in suppressing the CMC. In the study, in addition to the CMV characteristics, various practical performance characteristics such as voltage linearity, inverter output current ripple, inverter DC-link current ripple, and output line-to-line voltage pulse pattern are also analyzed. The study involves analysis, computer simulations, and detailed laboratory experiments.
21
Frasz, Derek P. "The closed-loop control of a three-phase inverter using a DSPACE DS1102 DSP board." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA360061.
Full textAbstract:
Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1998."December 1998". Thesis advisor(s): John G. Ciezki. Includes bibliographical references (p. 67). Also available online.
22
Chen, Ching-Chen, and 陳慶臻. "A multicarrier PWM for three-phase four-leg inverter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xk4kbd.
Full textAbstract:
碩士中華大學
電機工程學系
106
Three-phase three-leg inverter has an inherent common mode voltage (CMV) problem.Therefore, three-phase four-leg inverter is proposed to mitigate the CMV. This study discusses the characteristics of multicarrier pulse width modulation (PWM) for three-phase four-leg inverter. The analysis of sinusoidal PWM and space vector PWM with multicarrier is presented. The simulation results are utilized to validate the performances of the proposed multicarrier PWM scheme.
23
Chang, Chen-Wei, and 張陳維. "A multicarrier PWM for unbalance three-phase four-leg inverter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/p2a73t.
Full textAbstract:
碩士中華大學
電機工程學系
106
The three-phase four-leg inverter is a system for mitigating common-mode voltages better than three-phase three-arm inverters. Therefore, for the common mode voltage (CMV), two techniques for three-phase four-arm inverters with multi-carrier pulse width modulation (PWM), sinusoidal PWM (SPWM) and space vector PWM (SVPWM) are proposed. To lower the CMV. This method is used to explore the impact on the system under load imbalance. Finally, the experimental and simulation software PSIM platform is used to analyze its system to verify the correctness of the proposed method.
24
Sun, Wei-You, and 孫瑋佑. "The Control and Implementation of Three-Phase Four-Leg DC-to-AC Power Inverter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/38861606677135525723.
Full textAbstract:
碩士清雲科技大學
電機工程研究所
96
Generally,the traditional three-phase three-leg DC-to-AC power inverter are used widely with three phase balanced loads. But, when the three-phase loads are unbalanced, that three phase voltage outputs can not be symmetrical. In this paper presents a three-phase four-leg DC-to-AC power inverter can be supply a midpoint to three phase unbalanced loads.So the three-phase four-leg DC-to-AC power inverter outputs three phase symmetrical voltages. Using symmetrical model analysises three-phase four-leg DC-to-AC power inverter how it suppresses the unbalanced loads. The mathematic model of three-phase four-leg DC-to-AC power inverter is established in different coordinates. Paper accomplishes the decoupling of the three-phase four-leg DC-to-AC power inverter. PI double loop controller based on synchronous frame is applied. The control circuit cosists of digital processor(DSP TMS320F2808PZA),which programmed in C language. The performance of system is simulated MATLAB SIMULINK. Experiments the three-phase four-leg DC-to-AC power inverter can output three-phase balanced AC voltage under the unbalanced loads conditions.
25
Wei, Hsiao-tse, and 魏孝哲. "Post-Fault Control Strategy for Permanent-Magnet Synchronous Motor Drives with Six-Leg Three-Phase Inverter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/h4hp5c.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
97
The thesis is concerned with the analysis and development of six-leg three-phase inverter for permanent-magnet synchronous motor(PMSM) drives. The power circuit uses six-leg three-phase inverter. Connecting each winding to two separately controlling legs yields three phase dc-ac converter. The inverter control strategy uses unipolar voltage switching method to raise the utilization factor of dc-link voltage. When a winding of three-phase PMSM breaks down, the associated load may have to be reduced to retain continuous running and increase the reliability of the system. In the fault tolerance control strategy, the current of PMSM is used to determine which winding is broken, so that the other two winding currents can be corrected to result in a 60-degree angle difference, thereby reducing torque pulsation. In the proposed system, six Hall-effect sensors are used to measure the position and speed of the rotor to facilitate the coordinate transformation of feedback current to achieve d-q currents and speed closed-loop control. In this thesis, Matlab/Simulink is used to simulated the proposed PMSM system including six-leg three-phase inverter with unipolar voltage switching method control strategy, d-q current closed-loop control, speed closed-loop control and fault tolerance control strategy. The digital signal processor TMS320F2808 is adopted as the control core. A prototype of 100W six-leg three-phase inverter for PMSM drives is built. The speed is 170 rpm and the load is 4 N-m. When under the normal operation of the system, the total harmonic distortion of each phase-current is 14.67 %. While for two-winding operations of three different cases, the total harmonic distortions of three phase-currents for each case measured are 17.90%, 16.48% and 17.37%, respectively. The proposed system performance is thus verified experimentally.
26
Li, Nong-Yi, and 李穠義. "Design and Implementation of Modulated Predictive Current Controllers for Three-Phase Four-Leg Two-Level Inverters." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/j4uksd.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
107
This thesis proposes a novel type of modulated model-free predictive current control for three-phase four-arm two-level inverters. Compared to traditional techniques, the proposed method effectively improves current response at high frequencies by incorporating the optimal selection of two switching states based on simple calculation and then combines to the next switching state. This selection method effectively detects the optimal two modulated switching states in each sampling period. In addition, the improved control response at high frequency effect is introduced using an enhanced updating mechanism of the current difference. This is to enable the switching states of alike phase voltage to update current difference amount at the same time. In order to verify the proposed method, the simulation is conducted using MATLAB/Simulink software, and implemented using the TMS320F28379D dual-core digital signal controller by Texas Instruments. The simulation and experimental results show that the proposed method can significantly improve the current tracking performance compared with the existing methods.
27
Yang, An-Li, and 楊安立. "Design and Implementation of Three phase Three level Inverter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/79hauh.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
106
This thesis proposes the design and implementation of a digitally-controlled three phase three level inverter. The proposed three level circuit which is using T-type topology. The benefits of this topology are using fewer components, reducing the devices stress and the lower output voltage THD. A digital signal processor (DSP) chip is Texas Instruments TMS320F28335. It’s a high performance digital control chip and also has floating-point unit (FPU). Therefore, it’s suitable for three phase controlled application. The proposed modulation strategy is carrier-based pulsewidth modulation. This technique can be implemented with a very simple algorithm and, hence, can be processed very quickly. In addition, it can generate the maximum modulation index up to 1.154 that is attainable under linear modulation, such as space vector modulation. Finally a 6 kW three phase T-type inverter is implemented.
28
Liou, Yow-Chyi, and 劉又齊. "Modular Parallel Three-Phase Inverter System." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/19183263793677806566.
Full textAbstract:
碩士國立成功大學
電機工程研究所
82
This paper develops three-phase inverter modules that have the functions: (1)inverters for stand-alone operation; (2) inverters in parallel;(3)inverters in parallel with utility system. For obtaining parallel operation, the parallel technique for a voltage-controlled PWM inverter and (N-1) current-controlled PWM inverters is proposed. Through the current control, the current-controlled PWM inverters can be operated in synchronism with the voltage-controlled PWM inverter. By a load-sharing center, the load is shared to each inverter in parallel, and accurately limits the output current of each inverter to its maximum rating. From the experiment results, this proposed scheme is adequate. is adequate.
29
ZI-YI, YE, and 葉子儀. "A Multi-function three Phase Inverter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/84623407196216729535.
Full textAbstract:
碩士聖約翰科技大學
電機工程系碩士班
103
This thesis presents a multifunctional motor drive that is capable of driving three phase induction motors or single phase induction motors or dc motors. The three-phase DC/AC full-bridge power circuit is used for energy conversion. PIC18F4431 microcontroller is used as the control core, and pulse width modulation (PWM) switching technology is for the motor speed control. Applying suitable control scheme, the inverter can drive different kind of motors without extra hardware cost. Simulation and experimental results demonstrate the feasibility of the method.
30
Hsieh, Hsin-Chih, and 謝欣志. "Feedback Dithering Modulation for Three-Phase Inverter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/16607377084953441230.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
102
Recently developed feedback dithering modulation is extended from single-phase to three-phase in this thesis. The feedback dithering modulation scheme, owing to its feedback noise shaping nature, has advantages over the popular SVPWM in two aspects: improvement of modulation signal quality for low input signal levels and insensitivity to imperfect switching waveforms caused by non-ideal switching devices and inevitable deadtime. These properties make the feedback dithering modulation an attractive alternative to the conventional modulation schemes. The three-phase feedback dithering modulation scheme is implemented on the DSP TMS320F28069 to switch a 2kW three-phase inverter. The experimental result shows that there is less than 2% of total harmonic distortion plus noise (measured up to 2.4kHz) present at the inverter output (300 Volt DC-link voltage, 100 volt peak to peak output three phase sinusoidal wave.).
31
Hsin-HungChen and 陳信宏. "A Novel Three-Phase Five-Level Inverter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87041337151570512045.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
101
In this thesis, a novel three-phase five-level inverter is proposed. The proposed topology constructed of twelve power switches and twelve diodes to achieve a three-phase five-level AC Y-connected output. The output line-to-line voltage is five levels and total harmonic distortion is lower. Compared to the traditional three-phase inverters, the proposed three-phase five-level inverter can achieve the five output voltage levels with fewer components. In this thesis, the details of the mode analyses and control methods are discussed. An experimental prototype with input voltage 500 V, output power 6 kW, THD 3.62%, and efficiency 98.40% is implemented to verify the theory and feasibility of the proposed topology.
32
Lin, Ting-shih, and 林庭世. "Design and Implementation of a Three-Phase Three-Wire Bi-directional Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16168333065490839352.
Full textAbstract:
碩士國立中正大學
電機工程所
98
This thesis presents design and implementation of a predictive current control for a three-phase three-wire bi-directional inverter with wide inductance variation. The bi-directional inverter can fulfill both grid connection and power factor correction. With a predictive current control, the inverter is allowed to have a wide inductance variation, reducing core loss and size significantly. The proposed predictive current controller is realized with a simplified approach, which uses only the feedback signals of inductor currents for determining the control law. In the design and implementation, the inductances corresponding to various currents are measured, and tabulated into a single-chip microcontroller for tuning loop gain cycle by cycle, ensuring system stability. Measured results from a 10 kW 3? bi-directional inverter have been presented to confirm the feasibility of the inverter.
33
Wicks, Kenneth. "DSP control of a three phase UPS inverter." Thesis, 2001. http://hdl.handle.net/2429/11496.
Full textAbstract:
The demand for three-phase uninterruptible power supplies has increased with the
decrease in reliability of power supplied by power utilities. A single three-phase
uninterruptible power supply (UPS) can typically supply many loads at a time. A UPS
must be able to supply relatively undistorted output line voltages with highly non-linear
loads. Many papers have been devoted to introducing new control schemes that can
supply these loads effectively.
A new control scheme is introduced, in this work, which is implemented with a
digital signal processor (DSP). The controller acts in a stationary reference frame as
opposed to the commonly used rotating reference frame. Although using a stationary
reference frame can create phase errors, the control algorithm is computationally more
efficient than using a rotating reference frame. The proposed technique uses two line
voltages and the corresponding differential output filter inductor currents for those lines
as the control variables. As a result, this technique utilizes fewer sensors compared to
techniques using a rotating reference frame.
In this work, the plant model is developed and the stability of the controller is
analyzed. The controller design is facilitated with the use of a Mathcad workspace,
Steady-state simulations and experimental results are presented for a balanced resistive
load. Even with relatively slow inner current loops, the performance of the controller is
acceptable. Slow current controllers are used because of large noise in the current
measurements of the experimental inverter.
This work provides the basis to further investigate the feasibility of using the
proposed controller to supply non-linear loads.
34
Jiang, Yan-Ming, and 江彥銘. "The Implementation of a Three-Phase Multilevel Inverter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/70190223556086829245.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系博碩士班
102
The thesis presents a multilevel inverter for the high power system. The multi-level inverter architecture is NPC type. The thesis uses a digital sine pulse width modulation (DSPWM) technology to control the multi level inverters which is implemented by a micro-controller (Arduino) and a programmable logic device (CPLD). In comparison with the traditional two-level inverter, the multilevel inverter is able to operate at a lower switching frequency and have the advantage of lower current ripple. The thesis investigates each part and the digital control architecture of the multi-level inverter. Also, the proposed inverter is simulated and analyzed by the Matlab software. Furthermore, a three-phase multi-level inverter is implemented by a micro-controller and a CPLD. The experimental results show the feasibility of the proposed converter. Keywords: Sine pulse width modulation(SPWM)、Multi-level Inverter
35
Wang, Kai-Li, and 王凱立. "Single-Phase Three-Wire Emergency Power Inverter System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/23561615391436792917.
Full textAbstract:
碩士國立中正大學
電機工程研究所
101
This research develops a 5 kVA single-phase three-wire emergency power inverter, including grid connection, rectification and inversion modes of operations. The inverter consists of a power stage and a control stage. The power stage is realized with a full-bridge configuration, and a single-chip microcontroller TMS320F28069 is adopted to realize control laws. In grid-connection mode, the inverter will inject real power to the utility grid. In rectification mode, inverter will charge DC Bus. Both of grid-connection and rectification modes use digital current control. When utility grid fails, the inverter can function as an uninterrptible power system (UPS). In the UPS mode, the control with load impedance estimation and iterative learning control is proposed. According to this control scheme, the inverter can shape sinusoidal output voltage with low distortion under different load conditions. Finally, the inverter has been built and tested. Experimental results have verified the proposed control scheme and feasibility of the system.
36
Chen, Chih-Chun, and 陳至鈞. "Design and Implementation of 20 kW Three-Phase Three-Wire Bi-directional Inverter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/40247967307177847398.
Full textAbstract:
碩士國立中正大學
電機工程研究所
100
This thesis presents two-phase modulated digital current control for a three-phase bi-directional inverter with wide inductance variation in dc distribution systems. The bi-directional inverter can fulfill both grid connection and rectification. With the proposed control, the inverter is allowed to have wide inductance variation, reducing core size significantly. Additionally, the control can accommodate three-phase voltage distortion and imbalance. Design and selection of components, such as switches, schottky diodes and core materials, are also addressed in this thesis. Measured results from a 20 kW three-phase bi-directional inverter have been presented to confirm the feasibility of the discussed control approach.
37
Chen, Ying Hsiu, and 陳盈修. "Design and Implementation of High Power Three-Phase Three-Wire Bi-directional Inverter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/98462102748200133288.
Full textAbstract:
碩士國立清華大學
電機工程學系
103
This thesis presents design and implementation of a three-phase three-wire bi-directional inverter with two operation modes, grid-connection mode and rectification mode. In grid-connection mode, the power is transformed into AC and injected into the utility grid. In rectification mode, power from the utility grid is transformed into DC to supply DC loads. The circuit is divided into two parts, including a power stage with the configuration of a three-phase three-wire full-bridge inverter and a control stage with a single-chip micro-controller Renesas RX-62T implementing the control law of Division-Summation (D-Σ) Digital Control. With the proposed control method, the limitations of abc to d-q frame transformation can be overcome and the core size can be reduced significantly, since inductance variation is taken into account. Additionally, the proposed control method can accommodate the effect of three-phase voltage distortion and imbalance. First, plant derivation based on D-Σ digital control is discussed. Next, the controller is derived with the aim of canceling the variation effects of dc voltage, switching period and inductances. Then, the derivation of duty ratios based on Two-Phase Modulation with the reallocation of T0 and T7 is explained in detail. In addition, the mechanism of DC-bus voltage regulation and selection of the inductor core are also presented. Finally, the inverter has been implemented and tested. Simulated and experimental results have verified the feasibility of the proposed control scheme. There are two major contributions in this research. First, the derivation of duty-ratios is different from that in the literature related to D-Σ digital control. In this research, the derivation follows the procedure of the conventional control system theory in which the plant is derived first, and then the controller is designed. Finally, a system control block diagram is obtained and stability is analyzed. Secondly, the D-Σ digital control is applied to a 60 kW power converter system and the effects caused by nonideal characteristics of the components are considered and improved.
38
Chen, Chun-Hung, and 陳俊宏. "Study of a Novel Four-Switch Three-Phase Inverter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/88070340764126702697.
Full textAbstract:
碩士國立宜蘭大學
電機工程學系碩士班
96
A novel four-switch three-phase inverter is designed and implemented. A low cost four main switches and four auxiliary switches power converter configuration of the three-phase inverter is proposed. All main switches in the three-phase inverter operate at zero voltage switching (ZVS) turn on and turn off. Also, the auxiliary switches operate at zero current switching (ZCS) turn on and turn off. Moreover, the reduction in the number of main switches can also increase the reliability, since the control circuits and the auxiliary circuits are there by reduced to two sets. Therefore, the proposed power converter configuration achieves the low cost and high efficiency inverter without changing devices rate. The principle of operation, computer simulation and experimental results of the four-switch three-phase inverter, rated 200W and operated at 40kHz are provided to demonstrate the performance. Keywords: Zero-Voltage Switching (ZVS), Zero-Current Switching (ZCS), Four-Switch Three-Phase Inverter (FSTPI)
39
Chou, Yu Ping, and 周右平. "Design of a 10kW Three-Phase Grid-tied Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/c86phe.
Full textAbstract:
碩士長庚大學
電機工程學系
104
Inverters in back to back connection are utilized to convert the voltage and frequency of the power source to another format. Typical application of inverters is the wind power system. This study presents a back to back inverter for equal voltage and frequency format conversion. In the back to back inverter, one inverter works to get active power in order to maintain the dc-link voltage, and another inverter returns part of the active power to the power grid. The power grid affords only the power loss of the inverter, which benefits the test of the inverter rated above 10kW under general distribution line. Experimental setups include single inverter reactive power control and back to back inverters active and reactive power controls. Experimental results show that the power returns to the power grid is close to originally put in, and the power capability can achieves 15kW.
40
Bhasagare, Mayuresh. "Three-phase multilevel solar inverter for motor drive system." Thesis, 2015. http://hdl.handle.net/1805/7929.
Full textAbstract:
Indiana University-Purdue University Indianapolis (IUPUI)This thesis deals with three phase inverters and the different control strategies that can be associated with an inverter being used together. The first part of this thesis discusses the present research in the fields of PV panels, motor drive systems and three phase inverters along with their control. This control includes various strategies like MPPT, Volts-Hertz and modulation index compensation. Incorporating these techniques together is the goal of this thesis. A new topology for operating an open end motor drive system has also been discusses, where a boost converter and a flyback converter have been used in cascade to run a three phase motor. The main advantage of this is increasing the number of levels and improving the quality of the output voltage, not to mention a few other benefits of having the proposed circuit. A new algorithm has also been designed for starting and stopping the motor, which controls the current drawn from the power source during starting.
41
Chen, You-Sheng, and 陳佑昇. "Application of Zero-vector Control to Three-phase Inverter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/c8xrzm.
Full textAbstract:
碩士國立虎尾科技大學
電機工程研究所
100
In this thesis, a new control method application of zero-vector control to three-phase inverter is proposed. In order to control amplitude of output current, the d-q axis coordinate transformation, hysteresis controller and space vector strategy are adopted. Besides, the frequency of output current also can be adjusted by zero-vector control. Therefore, the proposed inverter has lower switching loss, higher system efficiency and better dynamic response. Use VisSim simulation software and TI TMS320F28335 chip to implement the proposed control strategy. The controller has several advantages such as easier to control, smaller circuit size, fully digital design etc.. Finally, the experimental results are compared with the proposed theory for verification.
42
NG, JUNXIANG, and 黃俊翔. "Development of a Bidirectional Three-Phase Grid-Connected Inverter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/33182866584729568814.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
102
This thesis has developed a three-phase inverter which is able to operate in a grid-connected mode and stand-alone mode. For grid-connected mode, the power from a renewable energy source (RES) can be sold to the grid. On the other hand, the ac power from the grid can be supplied to the load when the power of RES is insufficient. The RES converted in this thesis is a photovoltaic (PV) solar energy. The RES set up in this thesis consists of a DC-DC converter, an Maximum Power Point Tracking （MPPT） converter, and a PV emulator. To have a good control design, an accurate converter model is required. In the thesis, we have proposed an augmented matrix method (AM).The method is very accurate compared to the conventional time-averaged model.
43
Lin, Shu-Yong, and 林書永. "Development of Digital Signal Processor Based Parallel Three–Phase Three-Level Power Inverter Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23735045695037221772.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
96
This thesis presents the development of parallel three-phase inverter systems. In the three-phase inverter system, the three-level switching is designed to reduce the output voltage harmonics. The first power inverter is operated at voltage-controlled mode which uses voltage closed-loop control to provide stable and low-harmonic ac voltage source to load, while the second parallel power inverter is operated under current-controlled mode which uses current closed-loop control to supply the power in accordance with the build-in power-distribution list, and thereby achieves paralleling control and load-sharing. In this thesis, the digitized mathematical models are built. The strategies of voltage and current closed-loop controls using the coordinate transformation are inferred. Then, a high-performance, low-cost digital signal processor (DSP, TMS320LF2812) and complex programmable logic device (CPLD, XC9536) is used to implement the system for reducing the circuit components and cost. Experimental result for single power inverter yields the full-load power of 750W with voltage harmonic distortion of . Whereas, with 1kW parallel controlled system, each power inverter loads half of the output load power by using the strategy of balanced current sharing. In order to increase the reliability, master-slave control technique is used.
44
Chen, Po-Shen, and 陳柏燊. "Conductive EMI Filter Design for Single-phase Converter and Three-phase Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/2aq8kn.
Full textAbstract:
博士國立臺北科技大學
電機工程系研究所
99
The objective of this dissertation is to develop the conductive EMI filters for single-phase converter and three-phase inverter. First, the presented software-based separation method is developed. In single-phase converter or three-phase inverter, the LISN (Line Impedance Stabilization Network), which is with single-terminal output socket, is applied to EMI measurement and separation of common mode and differential mode components. The common mode noise and differential mode noise separation is performed using software written in LabVIEW. The single-phase converter and three-phase inverter used are as the EUT and the conductive EMI filters are designed using the corner frequency method presented previously. However, this approach does not consider the frequency dependency of common mode choke. Measured results demonstrate that the high frequency noise can’t be suppressed effectively using the EMI filter designed based upon previous method. Thus, the dissertation proposes a new conductive EMI filter design method based upon software conductive noise separation method. Analytic forms of conductive EMI filter derived by regarding the conductive EMI noise source as either voltage source or current source will be included in this dissertation. The required attenuation level for the filter design is determined by the measured noise, common mode noise, differential mode noise and the related limit line. The presented method determines common mode choke and differential mode choke based upon the required impedance of attenuate the noise. The over-voltage and ringing at the motor terminals of an inverter-fed ac motor drive system, created from pulse width modulation (PWM) along with long power cable. The related EMI caused by long cable issue is also investigated and EMI filters are designed. Experimental results confirm that the proposed EMI filter method applied to both single-phase converter and three-phase inverter can effectively suppress the EMI noise and meet the related conductive EMI standard.
45
Chen, Ying-Chi, and 陳英頎. "Implementation of AC Three-Phase/Single-Phase Inverter with High Power Factor." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/69672598967180773705.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
96
This thesis presents the three-phase to the single-phase inverters with front-end power factor correction (PFC) circuit for the non-contact power supply. By using the induction coupling of the power transformer, the technology of the non-contact power supply, transfers the energy from the supply to the load without a transmission line, can widely be utilized for particular applications. The purpose of this thesis (research work) is the high power factor design of the AC-to-DC converter that can rectify the three-phase power connected to grid system to the DC-to-AC inverter for the AC output voltage source with high-frequency. The three-phase AC-to-DC converter is the three-phase boost converter which can be accomplished by using the method of the six-order harmonic injection. Meanwhile, the DC-to-AC inverter is the full-bridge phase-shift circuit that can be achieved by using the method of the integrator control. Finally, the design and the simulation of the 500W three-phase and single-phase inverter with high power factor can be completed by the validation of the experimental results. Under 3ψ220V input and fully load, the efficiency is 69.%, power factor is 0.978, current THD is 20.3%.
46
HONG, CHENG-JUN, and 洪澄浚. "Analysis and design of a three-phase inverter for UPS." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/12062125996049159158.
Full text
47
Cheng-AnChien and 簡正安. "Study on DSP-Based Three-Phase Inverter with Bidirectional Converters." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/75515658012424243721.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
101
The purpose of the thesis is to study on three-phase inverter system with bidirectional converters. The three-phase inverter consists of three independent and symmetrical bidirectional converters. Each converter is drived by signals with 120 degree phase shift. The output voltage is sinusoidal with the same dc component. The output of inverter is in differential mode and the dc component disappears while only the sinusoidal voltage left on the load. The frond-end of three-phase inverter system is realized by boost converters in parallel with current sharing control strategy. The advantage is to raise output power capability and stability. A prototype 3kW three-phase inverter system is implemented and tested with the resistive load, inductive load and capacitive load. The maximum efficiency of boost converter is 96%. The maximum efficiency of three-phase inverter is 95% and THD is less than 3%. The maximum efficiency of overall system is 92%.
48
Lin, Li-Chiun, and 林力群. "D-Σ Digital Control Based Three-Phase Four-Wire Inverter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8tee2e.
Full textAbstract:
博士國立中正大學
電機工程研究所
103
This dissertation presents a division-summation (D-Σ) digital control for three-phase four-wire bi-directional inverters with wide inductance variation. The bi-directional inverters can fulfill grid connection, rectification and uninterrupted power supply (UPS). When AC grid is operated normally and the inverter system is connected to the grid, the system will be operated in grid-connection (GC) mode, which includes four functions: unity power factor (PF), rectification with pow-er-factor correction (PFC), PF leading and PF lagging. On the contrary, when the in-verter system is disconnected from AC grid due to grid fault, the system will be operated in UPS mode, supplying stable power continually for loads. The proposed D-Σ control summarizes the inductor-current variations over one switching cycle to derive control laws directly, which can overcome limitations of a-b-c to d-q transformation (Park transformation). With the proposed control, the inverter can track its sinusoidal reference currents or voltages, and it is allowed to have wide inductance variation, reducing core size significantly. In the literature, the D-Σ digital control for three-phase three-wire grid-connected inverters has been presented. However, the inverter with the previous control approach requires four control laws and four vector combinations, increasing the complexity of firmware programming. Since its region division is determined based on the zero-crossing point of line currents, the inverter is required to select different vector combinations corresponding to the phase shift between line currents and line voltages. To improve the limitations, the dissertation presents the improvement of the control-law derivation and region selection for the D-Σ digital control. By selecting the zero crossing points of phase voltages as region transitions, the control laws and the related parameter tables for the four modes can be unified to a general form. The switching sequences of the four modes are also unified to the switching pattern of the GC mode. Additionally, a D-Σ transformation matrix is identified to simplify the derivation procedure of the division (D) and summation (Σ), which can obtain the control law directly. To improve current distortion under low current levels, this dissertation presents three attempts, including mid-point current sampling, smooth region transition, current interleaving, and duty splitting. In the design and implementation, the inductances corresponding to various inductor currents are measured and tabulated into a single-chip microcontroller for tuning loop gain cycle by cycle, ensuring system stability. For extending of the application of D-Σ digital control, this dissertation presents the D-Σ digital control based three-phase four-wire inverter which is adopted for uninterruptible power supply. The D-Σ digital control cannot be directly applied to voltage tracking inverter since the above control is a current tracking control. Thus, this dissertation proposes an impedance estimation to estimate the load current variation, and the D-Σ digital control based voltage tracking can be achieved. Moreover, a repetitive control is also included in the D-Σ control to reduce harmonic distortion. The repetitive control not only records the voltage error of the last line cycle, but uses the error to modify the next switching-cycle voltage control which can fine tune the voltage tracking more sinusoidally. For a micro-grid application, this study combines the D-Σ current tracking and voltage tracking controls into the inverter operation, and the control strategies for mode transitions from GC mode to UPS mode and vice versa are presented. When connecting or disconnecting the grid, the two types of inverter operations can transit smoothly based on the proposed control strategies. Experimental results have con-firmed the discussions The above controls are all based on an LC filter. However, high frequency ripple current injection to the grid cannot be avoided. Actually, there are grid impedance and grid-voltage harmonics, which result in harmonic current injection to the grid. To reduce grid current harmonics, this dissertation presents an improvement of LCL-filter design and control method based on the D-Σ digital control. Its feasibility has been verified from the measurement of a single-phase inverter and the simulation results of a three-phase four-wire inverter. Keywords: Division-summation (D-Σ), digital control, three-phase inverter, induct-ance variation, impedance estimation, repetitive control, LCL-filter.
49
Huang, Jyun-Wei, and 黃俊偉. "A Novel High Efficiency Inverter for Three-phase Induction Motor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/v7kaa5.
Full textAbstract:
碩士國立虎尾科技大學
電機工程研究所
99
In this thesis a novel high efficiency inverter for three-phase induction motor is proposed. The proposed drive consists of DC/DC Buck converter and three-phase inverter. To maintain amplitude of motor current, hysteresis current control and space vector are adopted. Besides, the frequency of inverter output current also can be adjusted by output voltage of DC/DC Buck converter. Therefore, the proposed drive has lower switching loss, higher efficiency and better dynamic response.The constant stator current is used to control motor speed in closed loop control, completion of induction motor speed to keep const For fully digital control, TI DSP TMS320F28335 and Vissim development software are adopted to implement the control circuit. Hence, thr control circuit becomes more flexible and more small size. Finally, some experiment results are presented to verify the feasibility of the proposed motor drive.
50
XuanLin and 林軒. "Study on Three-Phase Inverter System with SPWM and SVPWM Techniques." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26251093294676334698.
Full text