Dissertations / Theses on the topic 'Single Stage Inverter'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 28 dissertations / theses for your research on the topic 'Single Stage 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.
Mansfield, Keith. "COMPARISON OF SINGLE STAGE AND TWO STAGE STAGE GRID-TIE INVERTERS." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2730.
Full textM.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
Saghaleini, Mahdi. "Switching Patterns and Steady-State Analysis of Grid-Connected and Stand-Alone Single-Stage Boost-Inverters for PV Applications." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/796.
Full textTian, Feng. "SOLAR-BASED SINGLE-STAGE HIGH-EFFICIENCY GRID-CONNECTED INVERTER." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3503.
Full textM.S.E.E.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical Engineering
Moraka, Otshepeng Johny. "Single stage boost inverter for standalone fuel cell applications." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/24294.
Full textZhao, Zheng. "High Efficiency Single-stage Grid-tied PV Inverter for Renewable Energy System." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27520.
Full textPh. D.
Liu, Xiao. "Power control of single-stage PV inverter for distribution system volt-var optimization." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/36.
Full textKashefi, Kaviani Ali. "Dynamic Modeling and Analysis of Single-Stage Boost Inverters under Normal and Abnormal Conditions." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/655.
Full textYaqoob, S. J., A. Obed, R. Zubo, Yasir Al-Yasir, H. Fadhel, Geev Mokryani, and Raed A. Abd-Alhameed. "Flyback photovoltaic micro-inverter with a low cost and simple digital-analog control scheme." MDPI, 2021. http://hdl.handle.net/10454/18583.
Full textThe single-stage flyback Photovoltaic (PV) micro-inverter is considered as a simple and small in size topology but requires expensive digital microcontrollers such as Field-Programmable Gate Array (FPGA) or Digital Signal Processor (DSP) to increase the system efficiency, this would increase the cost of the overall system. To solve this problem, based on a single-stage flyback structure, this paper proposed a low cost and simple analog-digital control scheme. This control scheme is implemented using a low cost ATMega microcontroller built in the Arduino Uno board and some analog operational amplifiers. First, the single-stage flyback topology is analyzed theoretically and then the design consideration is obtained. Second, a 120 W prototype was developed in the laboratory to validate the proposed control. To prove the effectiveness of this control, we compared the cost price, overall system efficiency, and THD values of the proposed results with the results obtained by the literature. So, a low system component, single power stage, cheap control scheme, and decent efficiency are achieved by the proposed system. Finally, the experimental results present that the proposed system has a maximum efficiency of 91%, with good values of the total harmonic distortion (THD) compared to the results of other authors
This work was supported in-part by Innovate UK GCRF Energy Catalyst PiCREST project under Grant number 41358, in-part by British Academy GCRF COMPENSE project under Grant GCRFNGR3\1541
Afiat, Milani Alireza. "Voltage regulation in a single-stage three-phase boost-inverter using modified phasor pulse width modulation method for stand-alone applications." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16219.
Full textDepartment of Electrical and Computer Engineering
Behrooz Mirafzal
In this thesis, a modified version of the phasor pulse width modulation (PPWM) switching method for use in a single-stage three-phase boost inverter is presented. Because of the required narrow pulses in the PPWM method and limitations in controller resolution, e.g. dSPACE, the desired switching pattern for a boost inverter requires a costly processor. A low resolution processor can cause pulse dropping which results in some asymmetric conditions in output waveforms of the boost inverter and therefore, an increase in the THD of the output waveform. In order to solve this problem, a new switching pattern is developed which guarantees symmetric conditions in the switching pattern by discretizing the switching pattern in every switching cycle. This switching pattern has been applied to a boost inverter model developed by SimPowerSystems toolbox of MATLAB/Simulink. The model has been simulated in a wide range of input DC voltage and load. Moreover, a laboratory-scaled three-phase boost inverter has been designed, built, and tested using an identical switching pattern in the same input voltage and load range. Both simulation and experimental results confirm the effectiveness of the new switching pattern.
Wang, Kunrong. "High-Frequency Quasi-Single-Stage (QSS) Isolated AC-DC and DC-AC Power Conversion." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29394.
Full textPh. D.
Wen, Hao. "High-Efficiency and High-Frequency Resonant Converter Based Single-Stage Soft-Switching Isolated Inverter Design and Optimization with Gallium-Nitride (GaN)." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/105134.
Full textDoctor of Philosophy
Inverters can convert dc voltage to ac voltage and typically people use two-stage approach with isolated dc-dc stage and dc-ac stage. However, this two-stage configuration suffers from more components count, more complex control and tend to have lower efficiency and lower power density. Therefore, the single-stage solution with dc-rectified sine wave stage and a line frequency unfolder becomes appealing. The unfolder circuit is to unfold the rectifier sine wave to an ac sine wave at the output. Since the unfolder is at line frequency and can be considered lossless, the key design is for the dc-rectified sine stage. The resonant converter featured for soft switching seems to be a good candidate. However, the inverter needs soft switching for the whole range and an enough wide voltage gain, which makes the design difficult, especially the target is high efficiency for the overall inverter. This dissertation aims to provide solutions for a high-efficiency, high-frequency resonant converter based single-stage soft-switching isolated inverter design. The LLC and LCLCL resonant converters are applied as the isolated dc-rectified sine stage with variable frequency modulation (VFM). Therefore, the rectified sine wave generation consists of many dc-dc conversion with different switching frequencies and an efficient dc-rectified sine stage design needs each dc-dc conversion to be with high efficiency. The design considerations and optimization methods for the LLC dc-dc conversion are firstly investigated. Based on these approaches, a MHz LLC converter based isolated inverter is designed with proposed hybrid modulation method. To further improve the light load performance, a MHz LCLCL converter based isolated inverter topology is proposed. The paralleled LC inside the LCLCL resonant tank can naturally create a zero voltage gain point which shows superior characteristics for rectified sine wave generation. Moreover, the LCLCL resonant converter based topology has bi-directional capability as well so it can work well for ac voltage to dc voltage conversion.
Smith, Christopher Lee. "Modeling and Control of a Six-Switch Single-Phase Inverter." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34492.
Full textMaster of Science
Shahlaei, Davoud [Verfasser]. "Single-image inverse lighting of faces with a virtual light stage / Davoud Shahlaei." Siegen : Universitätsbibliothek der Universität Siegen, 2018. http://d-nb.info/1161942971/34.
Full textSampaio, Leonardo Poltronieri [UNESP]. "Uma nova metodologia de projeto e controle para o inversor Boost (CSI) monofásico, para o aproveitamento de fontes alternativas e renováveis de energia elétrica." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/87049.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho propõe uma nova abordagem na metodologia de operação para o inversor Boost monofásico, como estrutura base para o aproveitamento de fontes alternativas e renováveis de energia elétrica. Considerando-se que equipamentos eletro/eletrônicos convencionais em CA (corrente alternada) necessitam, normalmente, de níveis e formato de tensão diferentes daqueles fornecidos por essas fontes de energia, o inversor proposto é uma estrutura integrada que tem a capacidade de operar como conversor elevador de tensão e inversor, apresentando um número reduzido de componentes e rendimento maior, quando comparado às formas tradicionais de se associar em cascata o conversor elevador com o inversor. O projeto convencional do inversor fonte de corrente (CSI) exige uma indutância elevada de entrada, além disso, o modelo a pequeno sinais do CSI é semelhante ao do conversor Boost no modo de condução contínua, apresentando um zero no semi-plano direito na função de transferência para o controle da tensão de saída, sendo que este zero causa o conhecido efeito de fase não-mínima. Desta forma, uma metodologia especial de projeto é apresentada resultando numa indutância Boost reduzida e numa técnica de controle utilizando um sistema multi-malhas, com alimentação direta, devidamente projetada de forma a possibilitar elevadas dinâmicas de transferência de energia. Adicionalmente, o inversor apresenta tensão de saída com reduzidas distorções harmônicas (DHT), número reduzido de componentes de potência e, consequentemente, elevada densidade de potência. Neste trabalho são apresentadas as análises qualitativa e quantitativa do inversor, a modelagem e técnica de controle proposta, metodologia de projeto, os principais resultados de simulação e experimentais com a finalidade de demonstrar a viabilidade de aplicação da proposta.
This work presents a new methodology for the operation and control of a single-phase current-source Boost Inverter, it is used as base structure for alternative and renewable electric energy sources. The electro/electronics devices normally require eletrical source in AC (alternate current) in different voltage levels and shapes those provided by the alternative and renewable electrical sources. The proposed inverter is an integrated structure able to operate as step-up DC-DC converter and inverter, it presents a reduced number of components, high efficiency when compared with the traditional technique of step-up and inverter for cascade association. The conventional design of current source inverter (CSI) require a large boost inductance, therefore, the small-signal model is similar to continuous-current-mode (CCM) Boost converter, which has a right-half-plane (RHP) zero in its control-to-output transfer function, and this RHP zero causes the well-known non-minimum-phase effects. In this context, a special design with small boost inductance and a multi-loop control is proposed in order to assure stability and very fast dynamics. Furthermore, the inverter presents output voltage with very low total harmonic distortion (THD), reduced number of components and high power density. In addition, this work presents the Boost CSI operation, the proposed control technique, the main simulation and experimental results in order to demonstrate the feasibility of the proposal.
Sampaio, Leonardo Poltronieri. "Uma nova metodologia de projeto e controle para o inversor Boost (CSI) monofásico, para o aproveitamento de fontes alternativas e renováveis de energia elétrica /." Ilha Solteira : [s.n.], 2010. http://hdl.handle.net/11449/87049.
Full textBanca: Falcondes Jose Mendes de Seixas
Banca: Denizar Cruz Martins
Resumo: Este trabalho propõe uma nova abordagem na metodologia de operação para o inversor Boost monofásico, como estrutura base para o aproveitamento de fontes alternativas e renováveis de energia elétrica. Considerando-se que equipamentos eletro/eletrônicos convencionais em CA (corrente alternada) necessitam, normalmente, de níveis e formato de tensão diferentes daqueles fornecidos por essas fontes de energia, o inversor proposto é uma estrutura integrada que tem a capacidade de operar como conversor elevador de tensão e inversor, apresentando um número reduzido de componentes e rendimento maior, quando comparado às formas tradicionais de se associar em cascata o conversor elevador com o inversor. O projeto convencional do inversor fonte de corrente (CSI) exige uma indutância elevada de entrada, além disso, o modelo a pequeno sinais do CSI é semelhante ao do conversor Boost no modo de condução contínua, apresentando um zero no semi-plano direito na função de transferência para o controle da tensão de saída, sendo que este zero causa o conhecido efeito de fase não-mínima. Desta forma, uma metodologia especial de projeto é apresentada resultando numa indutância Boost reduzida e numa técnica de controle utilizando um sistema multi-malhas, com alimentação direta, devidamente projetada de forma a possibilitar elevadas dinâmicas de transferência de energia. Adicionalmente, o inversor apresenta tensão de saída com reduzidas distorções harmônicas (DHT), número reduzido de componentes de potência e, consequentemente, elevada densidade de potência. Neste trabalho são apresentadas as análises qualitativa e quantitativa do inversor, a modelagem e técnica de controle proposta, metodologia de projeto, os principais resultados de simulação e experimentais com a finalidade de demonstrar a viabilidade de aplicação da proposta.
Abstract: This work presents a new methodology for the operation and control of a single-phase current-source Boost Inverter, it is used as base structure for alternative and renewable electric energy sources. The electro/electronics devices normally require eletrical source in AC (alternate current) in different voltage levels and shapes those provided by the alternative and renewable electrical sources. The proposed inverter is an integrated structure able to operate as step-up DC-DC converter and inverter, it presents a reduced number of components, high efficiency when compared with the traditional technique of step-up and inverter for cascade association. The conventional design of current source inverter (CSI) require a large boost inductance, therefore, the small-signal model is similar to continuous-current-mode (CCM) Boost converter, which has a right-half-plane (RHP) zero in its control-to-output transfer function, and this RHP zero causes the well-known non-minimum-phase effects. In this context, a special design with small boost inductance and a multi-loop control is proposed in order to assure stability and very fast dynamics. Furthermore, the inverter presents output voltage with very low total harmonic distortion (THD), reduced number of components and high power density. In addition, this work presents the Boost CSI operation, the proposed control technique, the main simulation and experimental results in order to demonstrate the feasibility of the proposal.
Mestre
Shen, Sheng-Yong, and 沈聖詠. "A Novel Single Stage Single Phase Step up/down Inverter." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/55011432217236195734.
Full text國立清華大學
電機工程學系
90
Inverters are widely used in various applications. However, traditional inverter configuration basically belongs to a step/down topology. In other words, the maximum peak voltage of the output AC voltage is limited to the input DC voltage. Hence, in case a higher output voltage is needed, it is necessary to either cascade one more stage of step/up CD converter or add an step/up transformer. This will, of course, result in larger size, lower efficiency and higher cost. In view of there, it is the main objection of this thesis to develop a single stage step up/down inverter without using an extra transformer. Basically, the contributions of this thesis may be summarized as follows. First, a novel single stage step up/down inverter without using a transformer is proposed to extend operation range of the output AC voltage. In fact, due to the four-quadrant operation capability of the proposed inverter, the new inverter can also be operated as an AC to DC converter. Second, mathematical model of the proposed inverter is also derived for feedback controller design and implementation. Third, in order to achieve a better performance, a closed loop controller is also presented to satisfy the desired specification. Finally, a hardware prototype of the proposed inverter is constructed to verify the feasibility of the proposed inverter.
SUKESH, NIKHIL. "Single Stage Grid-Connected Micro-Inverter for Photovoltaic Systems." Thesis, 2012. http://hdl.handle.net/1974/7317.
Full textThesis (Master, Electrical & Computer Engineering) -- Queen's University, 2012-07-06 16:24:13.385
Lo, Kuo-Yuan, and 羅國原. "Multi-Input Single-Stage Bi-Directional Grid-Connected Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/29214839732796191078.
Full text國立臺灣大學
電機工程學研究所
104
The objective of this dissertation is to propose a multi-input single-stage bi-directional grid-connected inverter (MSBG-inverter). The proposed MSBG -inverter is composed of multiple buck-boost type dc-dc converters (BBCs) and a dc-ac unfolder. Because there is only one switch operating at high frequency, single-stage conversion with circuit simplicity and higher efficiency can be achieved. For photovoltaic (PV) system application, the MSBG-inverters can eliminate the shading effect while fulfill the functions of dc-ac conversing and the distributed maximum power point tracking (DMPPT). For battery energy storage system application, the MSBG-inverters can realize individual power-handling capability while fulfill the functions of battery charging and discharging. Moreover, based on the developed equations, the power flow of the BBCs can be controlled without the need of input current sensor. Also, with the interleaved operation between BBCs, the current ripple of the output inductor can be reduced too. Finally, the computer simulations and hardware experimental results are shown to verify the performance of the proposed MSBG-inverter for the PV system and the battery energy storage system.
WU, MENG-CHE, and 吳孟澤. "Study and Implementation of Newly Single-Phase Three-Wire Single-Stage Inverter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/eu97vf.
Full text國立臺北科技大學
車輛工程系
107
This paper proposed a new single-phase three-wire single-stage inverter for the residential low-voltage power distribution. The proposed system structure integrates with an energy storage device, the active electronic switches, and a multi-port high-frequency transformer, for single-phase three-wire output loads. With the newly topology characteristic, the proposed inverter has the better system reliability, capability of single-stage power conversion for high-efficiency conversion, wide input voltage operation and the electrical isolation with safety satisfied. The content of the thesis includes the circuit operation principle, the small-signal model and the control loop analyzes, and pulse-width modulation techniques. Finally, a 1000W prototype has been built to verify the simulation and theoretical analysis results, for proving the system feasibility. The highest efficiency of 84% of the proposed inverter under 500W is achieved, compared with the buck/boost and boost/buck hybrid inverter types, the increased conversion efficiency is about 5%. The voltage gain is higher than semi-two-stage, boost, boost/buck hybrid, and boost/half-bridge hybrid inverter types are 3.2 times, 4 times, 1.9 times and 1.3 times.
Chung, Yi-Chih, and 鐘乙智. "Design and Implementation of Grid-Connection Single-Stage Photovoltaic Inverter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82577896404555606146.
Full text國立高雄第一科技大學
電子工程研究所
99
In this thesis, a grid-connection single-stage PV inverter system is presented, which can deal with solar energy and performs power conditioning. To draw maximum power from PV arrays, double-linear approximation (DLA) algorithm is incorporated to achieve maximum-power-point tracking (MPPT) for PV arrays. The DLA is based on that the trajectories of maximum power point varying with irradiation and with temperature are approximately linear, respectively. With the DLA, the inverter system can determine maximum power point instantaneously and then, calculates current command easily. Thus, complicated calculation and perturbation about an optimal point can be avoided. In this thesis a corresponding circuit to realize DLA is carried out as well, of which configuration is simple. As a result, the proposed circuit is cost-effective and can be embedded into inverter system easily. From simulated and experimental results, the proposed DLA algorithm has been verified and the feasibility of the PV inverter system is also demonstrated.
Chen, Yi-Lin, and 陳怡伶. "Design and Implementation of a Single Stage Low Power Photovoltaic Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/w24v5m.
Full text國立臺北科技大學
電力電子產業研發碩士專班
98
The Object of this thesis is to design and implement a low power single stage PV inverter using DSP to replace the traditional DC-DC and DC-AC two-stage inverter. In the proposed inverter, the core converter is constructed by using a single phase full bridge which converts low-voltage DC to AC voltage with the frequency and . In order to eliminate the dc component injected to output voltage and make isolation between Photovoltaic cell and output, an isolated transformer is added at the output of full bridge. The transformer is designed by ferrite core owning to the low switching loss, and raises the sinusoidal PWM voltage yielded by full bridge to the grid side. Two switches, which are synchronized with the switching signals of full bridge and one of switches is conducted half period of sinusoidal voltage, are utilized at output path of transformer to prevent the transformer into saturation. Furthermore, a low pass LC filter and a set of switch as freewheeling path for the inductor is added near the output side to mitigate the switching noise. Finally, some experimental results tested in a self-made inverter, 35 input and /200 / output, show the effectiveness of the proposed control strategies.
Lin, Ming-li, and 林明立. "A DSP-based Single-stage MPPT Inverter and Grid-connected Techniques." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17348012730636789486.
Full text國立臺灣科技大學
電子工程系
98
While fossil fuels exhaustion and greenhouse effects are widely concerned around the world, one of the most important issues toward to these problems is to find alternative energy for long-term solutions. Green energy offering the promise of clean and abundant energy gathered from self-renewing sources such as solar energy, geothermal energy and wind source are broadly developed. Solar cells are unique in that they directly convert the incident solar radiation into electricity. Photovoltaic (PV) power management concepts are essential to extract as much power as possible from the solar energy. PV energy systems are being extensively studied because of its benefits of environmental friendly and renewable characteristics. Unlike oil, gas and coals, solar energy does not emit greenhouse gases, or cause pollutions, and is expected to enhance the feasibility of lowering cost and increasing conversion efficiency. This thesis focuses on the developments of a high performance DSP-based single-stage grid-connected PV inverter system with maximum power point tracking (MPPT). The output voltage and current of the studied PV inverter are sensed to realize the MPPT control. The additional sensing for the PV array voltage and current is unnecessary. A perturbation and observation (P&O) method is implemented and cooperated with a zero-detection phase shift control scheme. The studied grid-connected single-stage PV inverter topology provides the benefits of low cost, simple configuration and good overall efficiency. A laboratory prototype system is built and tested. The experimental results are shown to verify the feasibility of the proposed scheme.
Ya-ChinCheng and 鄭雅今. "A Novel Single-stage Solar PV Micro-inverter with Active Power Decoupling Circuit." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/59274343567885354464.
Full text國立成功大學
電機工程學系碩博士班
100
For conventional single-stage Flyback AC module inverter, there is a large amount of power fluctuation of twice the grid frequency, causing high ripple components to appear on the output of the photovoltaic (PV) module. As a result, an electrolytic capacitor with large capacitance has often been used in order to suppress the current ripples thus caused. However, the lifetime issue of the electrolytic capacitor forms a reliability ceiling of the AC module inverter under high temperature environments. To overcome this problem, the thesis proposes a novel single-stage micro-inverter with power decoupling capability for the PV applications. The low-frequency power fluctuation is decoupled via an additional auxiliary circuit that enables employment of high-reliability film capacitors with small capacitance not only for the DC input capacitor of the micro-inverter, but also for the decoupling capacitor used in the decoupling auxiliary circuit. The reliability and lifetime of the inverter can thus be highly increased. The proposed inverter also enables realization of small volume, lightweight, and simple structure with high reliability. The control schemes and effectiveness of the proposed inverter is verified by PSIM simulations and experiments on a 250W laboratory prototype having input voltage of 25-40V and output voltage of 110Vac. Promising results have been obtained with relatively low output current ripples of the PV module due to the power-decoupling circuit. The MPPT efficiency can thus be highly enhanced. Film capacitors can be adopted in the AC module inverter as well to greatly ensure the system reliability.
Huang, Shih-Hung, and 黃世宏. "Single-Stage High-Power-Factor Electronic Ballast with Class E Inverter for Fluorescent Lamps." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/47727888678690006798.
Full text國立中山大學
電機工程學系研究所
90
A single-stage high-power-factor electronic ballast with class E inverter is proposed for driving the fluorescent lamp. The circuit configuration is obtained from the integration of a buck-boost converter for power-factor- correction (PFC) and a class E resonant inverter for ballasting. The integrated ballast circuit requires only one active power switch and simple control. Operating the buck-boost converter in discontinuous conduction mode (DCM) at a fixed frequency, the electronic ballast can achieve nearly unity power factor. With pulse-width-modulation (PWM), the electronic ballast can provide an appropriate filament current for preheating, a high voltage for ignition, and then a desired lamp current for steady-state operation. An additional control circuit is included to eliminate the glow current during preheating stage. The operation of the ballast-lamp circuit is analyzed by fundamental approximation. Computer simulations are made and design equations are derived on basis of the power-dependent resistance model of the fluorescent lamp. With carefully designed circuit parameters, the active power switch can be switched on at zero current to reduce the switching losses leading to a higher efficiency. An experimental circuit designed for a PL-27W compact fluorescent lamp is built and tested to verify the computer simulations and analytical predictions. Experimental results show that satisfactory performances can be obtained on the proposed electronic ballast.
MANYATSI, THEMBELANI ZWELITHINI, and 張維里. "Research on Three Phase Multi-Input Single-Stage Grid-Tied Inverter for Photovoltaic Power Generation Systems." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/799uym.
Full text國立勤益科技大學
電機工程系
107
The main purpose of this thesis is to propose a three phase Multi-input Single-stage Grid-tied inverter (MSG-inverter) which can be used in distributed photovoltaic power generation systems (PVPGS). The proposed inverter is composed of micro dc-dc buck-boost converters (BBCs) and a dc-ac unfolder. Each micro BBC is connected to a single photovoltaic module (PV) in a PVPGS. The micro BBCs are connected to the central dc-ac unfolder through a dc bus. The micro BBCs are operating in discontinuous conduction mode (DCM). The pulsating dc current reduces stress and losses in the dc bus. Each micro BBC is equipped with a simple maximum power point tracker (MPPT) designed specifically to achieve maximum energy transfer. Each micro BBC is equipped with an interleaving power control scheme which is controlled using a signal from a phase lock loop (PLL). The architecture and control scheme of the proposed three phase MSG-inverter achieves a distributed MPPT (DMPPT) control and distributed power control of the PV array in distributed PVPGS. Finally some computer simulations results are presented to verify the performance of the proposed MSG-inverter.
Yu, Wun-Long, and 余文隆. "Design and Implementation of a DSP-Based Single-Stage Maximum Power Point Tracking Inverter for PV System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08030554325782788139.
Full text國立臺灣科技大學
電子工程系
97
This thesis presents the design and implementation of a DSP-Based single-phase single-stage photovoltaic (PV) energy inverter system which can extract maximum power from solar array. The main control scheme of the photovoltaic inverter system is: a perturbation and observation (P&O) method commonly employed for industrial applications as the maximum power point tracking algorithm cooperate with a digital sinusoidal pulse width modulation with unipolar voltage switching scheme to control the output frequency. For a market development issue, single-stage topology provides the benefits of low cost, easy implementation and improved overall system efficiency compared with conventional two-stage structure. Besides, this thesis proposes a new current sampling technique to enhance the system flexibility and the MPPT accuracy of maximum power point tracker (MPPT). Finally, the control of the photovoltaic inverter system established by a digital signal processor Texas Instruments TMS320F2808 is applied together with the software algorithm for the experiments to certify the proposed scheme.
Chen, Yong-shiuan, and 陳永軒. "Design and Implementation of a Quasi-Resonant Isolated Inverse SEPIC Single-Switch Single-Stage Adapter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/42767921012472806165.
Full text國立臺灣科技大學
電子工程系
98
This thesis aims to design and implement a single-stage single-switch power factor correction circuit with 90~264V universal AC voltage input and 24V DC output for low-power adapter applications. A quasi-resonant isolated inverse SEPIC converter is used to regulate the output voltage and achieve high input power factor simultaneously by using a simple single-stage circuit topology. The power switch is turned on with valley-switching control and the output diode is turned off with naturally zero-current-switching. The switching losses can be reduced to increase the conversion efficiency. Compared with the conventional single-stage Flyback converter, the proposed circuit can effectively reduce the output voltage ripple to less than 1%. A 20W laboratory prototype is designed and implemented to verify the proposed single-stage converter.
Tsai, Hung-Fu, and 蔡弘甫. "Design and Implementation of a Single-Stage Inverse Buck LED Driver without Electrolytic Capacitors." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/299bud.
Full text國立臺灣科技大學
電子工程系
99
This thesis aims to study and implement high-efficiency, high-power factor (PF), single-stage light emitter diode (LED) driver. Conventionally, electrolytic capacitors (EC) are necessary at the output of a LED driver to reduce output ripple and maintain overall system performance. However, the use of ECs shortens the lifespan of LED drivers. This thesis tests and compares the circuit performance of LED drivers with EC, with film capacitor and without output capacitor. According to experimental verifications, the studied single-stage LED driver offers the advantages of high-efficiency, high-power factor and low circuit cost.