Дисертації з теми "Grid Tied Multilevel Inverter"
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Prichard, Martin Edward. "SINGLE PHASE MULTILEVEL INVERTER FOR GRID-TIED PHOTOVOLTAIC SYSTEMS." UKnowledge, 2015. http://uknowledge.uky.edu/ece_etds/81.
Повний текст джерелаDi, Tullio Luccas. "Optimization of a grid-tied inverter : an application-oriented for designing multilevel converters." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58542.
Повний текст джерелаApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Liu, Qing. "Control of grid-tied inverters for nano-grids." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422338.
Повний текст джерелаZhao, Zheng. "High Efficiency Single-stage Grid-tied PV Inverter for Renewable Energy System." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27520.
Повний текст джерелаPh. D.
Abdelrazek, Ahmed Abdelhakim Moustafa. "Transformerless Grid-Tied Impedance Source Inverters for Microgrids." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3427190.
Повний текст джерелаPhotong, Chonlatee. "A current source inverter with series AC capacitors for transformerless grid-tied photovoltaic applications." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13128/.
Повний текст джерелаEldridge, Christopher Sean. "Using super capacitors to interface a small wind turbine to a grid-tied micro-inverter." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/8754.
Повний текст джерелаDepartment of Electrical Engineering
William B. Kuhn
During the development of an educational renewable energy production platform, it was found that there were no low-cost, efficient grid-tie interfaces for a 160 W DC wind turbine. Typically, a small DC wind turbine is used in conjunction with a rechargeable battery bank or, if the wind turbine is directly interfaced with a grid-tie inverter, a regulator with a diversion-load. The use of batteries is undesirable due to their high-cost and high-maintenance characteristics. Diversion loads by nature waste power, as any excess energy that cannot be accepted by a battery or inverter is usually converted into heat through a resistive element. Initially, a 24 V DC, 160 W Air Breeze small wind turbine was directly connected to an Enphase Energy M190 grid-tie micro-inverter. The 24 V DC Air Breeze wind turbine is designed to charge a battery or bank of batteries while the M190 micro-inverter is designed to convert the DC output of a 200 W solar panel to grid-tied AC power. As expected, the power-production response time associated with the small wind turbine and the power-accepting, load-matching response time of the micro-inverter were not compatible. The rapidly changing power output of the small wind turbine conflicted with the slow response time of the micro-inverter resulting in little power production. Ultimately, the response time mismatch also produced sufficiently large voltage spikes to damage the turbine electronics. In this thesis, a solution for a low-cost, efficient grid-tie interface using no batteries and no diversion load is presented. A capacitance of eight Farads is placed in parallel with the small wind turbine and the micro inverter. The large capacitance sufficiently smoothes the potential abrupt voltage changes produced by the wind turbine, allowing the micro-inverter adequate time to adjust its load for optimal power conversion. Laboratory experiments and data from an implementation of such a parallel super capacitor wind turbine to grid-tie micro-inverter configuration are provided along with DC and AC power production monitoring circuits interfaced with a micro controller.
Johnson, Benjamin Anders. "Modeling and Analysis of a PV Grid-Tied Smart Inverter's Support Functions." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/994.
Повний текст джерелаAlskran, Faleh A. "Dynamic modeling and analysis of the three-phase voltage source inverter under stand-alone and grid-tied modes." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18220.
Повний текст джерелаDepartment of Electrical and Computer Engineering
Behrooz Mirafzal
Increasing energy demand, rising oil prices, and environmental concerns have forced attention to alternative energy sources that are environmentally friendly and independent of fossil fuels. Renewable energy sources (RES) have become an attractive alternative to the traditional energy sources for electric power generation. However, one of the main challenges of RES adaption arises when connecting RES to the electric grid. Voltage source inverters (VSIs), typically, connect RES to the electric grid. Similar to any engineering system, detailed dynamic models of the VSIs are needed for design and analysis purposes. However, due to the non-linearity of VSIs, development of dynamic models that can accurately describe their behavior is a complex task. In this thesis, a detailed averaged-state-space model of the two-level three-phase space vector pulse width modulation VSI and its companion LCL filter is derived. Because VSIs can operate under stand-alone and grid-tied modes, two models were derived for each case. In the derived models, the VSI modulation index m and phase angle ϕ are initially considered constant. In practice, however, these parameters are considered the main control parameters. To model these parameters as control inputs, small-signal models of the VSI under stand-alone and grid-tied modes were derived. To verify the accuracy of the developed large-signal and small-signal models, Matlab/Simulink simulations were carried out. The simulation results were compared against the models results. Moreover, the models were verified through lab experiments. The developed models can be used as design and analysis tools. In addition, the developed models can be used as fast and efficient simulation tools for system studies, when the modeling of switching transients is not needed. Nowadays, the number of VSIs connected to the electric grid is growing exponentially. The amount of time and computation needed to simulate VSIs using simulation software packages can be significantly decreased by the use of the developed models.
Khlid, Ben Hamad. "Fuel cell power conditioning multiphase converter for 1400 VDC megawatts stacks." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/3042.
Повний текст джерелаEnergy systems based on fossil fuel have demonstrated their abilities to permit economic development. However, with the fast exhaustion of this energy source, the expansion of the world energy demand and concerns over global warming, new energy systems dependent on renewable and other sustainable energy are gaining more interests. It is a fact that future development in the energy sector is founded on the utilisation of renewable and sustainable energy sources. These energy sources can enable the world to meet the double targets of diminishing greenhouse gas emissions and ensuring reliable and cost-effective energy supply. Fuel cells are one of the advanced clean energy technologies to substitute power generation systems based on fossil fuel. They are viewed as reliable and efficient technologies to operate either tied or non-tied to the grid to power applications ranging from domestic, commercial to industrial. Multiple fuel cell stacks can be associated in series and parallel to obtain a fuel cell system with high power up to megawatts. The connection of megawatts fuel cell systems to a utility grid requires that the power condition unit serving as the interface between the fuel cell plant and the grid operates accordingly. Different power conditioning unit topologies can be adopted, this study considers a multilevel inverter. Multilevel inverters are getting more popularity and attractiveness as compared to conventional inverters in high voltage and high-power applications. These inverters are suitable for harmonic mitigation in high-power applications whereby switching devices are unable to function at high switching frequencies. For a given application, the choice of appropriate multilevel topology and its control scheme are not defined and depend on various engineering compromises, however, the most developed multilevel inverter topologies include the Diode Clamped, the Flying Capacitor and the Cascade Full Bridge inverters. On the other hand, a multilevel inverter can be either a three or a five, or a nine level, however, this research focuses on the three-level diode clamped inverters. The aim of this thesis is to model and control a three-level diode clamped inverter for the grid connection of a megawatt fuel cell stack. Besides the grid, the system consists of a 1.54 MW operating at 1400 V DC proton exchange membrane fuel cell stack, a 1.26 MW three-level diode clamped inverter with a nominal voltage of 600 V and an LCL filter which is designed to reduce harmonics and meet the standards such as IEEE 519 and IEC 61000-3-6. The inverter control scheme comprises voltage and current regulators to provide a good power factor and satisfy synchronisation requirements with the grid. The frequency and phase are synchronised with those of the grid through a phase locked loop. The modelling and simulation are performed using Matlab/Simulink. The results show good performance of the developed system with a low total harmonic distortion of about 0.35% for the voltage and 0.19% for the current.
Crisafulli, Vittorio Claudio. "Analysis and Development of new strategies for solar energy conversion: New systems of integration, topologies and control." Thesis, Università degli Studi di Catania, 2011. http://hdl.handle.net/10761/226.
Повний текст джерелаEkström, Rickard. "Offshore Marine Substation for Grid-Connection of Wave Power Farms : An Experimental Approach." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229191.
Повний текст джерелаKomlanvi, Moglo. "Computer aided design of 3D of renewable energy platform for Togo's smart grid power system infrastructure." Thesis, University of Derby, 2018. http://hdl.handle.net/10545/623021.
Повний текст джерелаYang, Zhiqing [Verfasser], Doncker Rik W. [Akademischer Betreuer] De, and Frede [Akademischer Betreuer] Blaabjerg. "On the stability of three-phase grid-tied photovoltaic inverter systems : modeling, investigation, and stability-enhanced operation / Zhiqing Yang ; Rik W. de Doncker, Frede Blaabjerg." Aachen : Universitätsbibliothek der RWTH Aachen, 2021. http://nbn-resolving.de/urn:nbn:de:101:1-2021081007552125199862.
Повний текст джерелаAlgarny, Khalil Saad A. "The development of three-phase cascaded h-bridge multilevel inverter with DC-side sensor-less control for applications of independent MPPT photovoltaic and battery grid-connected systems." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/207283/1/Khalil%20Saad%20A_Algarny_Thesis.pdf.
Повний текст джерелаOlímpio, Filho José de Arimatéia. "Conversor multifuncional conectado à rede elétrica para compensação de oscilações de potência instantânea /." Bauru, 2019. http://hdl.handle.net/11449/191227.
Повний текст джерелаResumo: Esta dissertação de mestrado propõe o desenvolvimento e a implementação de uma estratégia de compensação para conversores eletrônicos de potência (CEP) multifuncionais conectados à rede elétrica. A geração dos sinais de referência de corrente para o conversor multifuncional é obtida através das grandezas conservativas da CPT, do inglês Conservative Power Theory. O CEP proposto neste trabalho desempenha o papel de um conversor interface de rede no modo conectado, tendo como finalidade a mitigação de oscilações de potência instantânea bem como injeção de potência ativa na rede elétrica, caracterizando assim o seu aspecto multifuncional. São realizados estudos teóricos e simulações computacionais com o intuito de validar a estratégia proposta. Para tanto, foram identificadas as parcelas indesejadas de corrente que permitam a compensação das componentes oscilatórias da potência instantânea e da energia reativa instantânea da CPT. O CEP é controlado em modo corrente, através da estratégia de modulação PWM com duas malhas de controle. A estratégia de compensação e o sistema de controle serão avaliados e testados via simulação para diferentes configurações de cargas, incluindo uma carga não-linear desbalanceada operando em condições onde as distorções e desequilíbrios de tensão sejam consideráveis. Por fim, resultados experimentais obtidos com um protótipo em escala laboratorial são utilizados para validar a estratégia de compensação proposta
Abstract: This master’s thesis proposes the development and implementation of a compensation strategy for the three-phase multifunctional grid-tied inverter. The reference signal generation method for grid-tied is based on the Conservative Power Theory (CPT). In this work, the multifunctional inverter plays the role of the Utility Interface (UI) which perform several functions: in grid-connected operation, it injects active power into the grid and compensates the instantaneous power oscillation and the instantaneous reactive energy oscillation. The goal is to execute theoretical studies and computational simulations to validate the proposed strategy. For this purpose, firstly are identifies the unwanted currents which allow the compensation of the oscillatory terms of instantaneous power and reactive energy. The inverter is controlled in current mode through PWM modulation strategy with two control loops. In addition, the proposed compensation strategy and control system is evaluated and tested for different load configurations, such as linear and nonlinear loads (balanced and unbalanced) operating under different voltage conditions (distorted and unbalanced). Finally, experimental results are presented to validate the effectiveness and performance of the proposed compensation strategy.
Mestre
Huang, Wei Che, and 黃偉哲. "Design of Cascadable Grid-Tied Multilevel Inverter Modules for High Voltage Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/485e35.
Повний текст джерелаBanavath, Satish Naik. "A New Class of Single DC-link Fed Multilevel Inverter Topologies for Grid Connected Photovoltaic Systems with Reduced Component Count and Inherent Capacitor Balancing." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4203.
Повний текст джерелаWu, Chih-Chung, and 吳志崇. "DESIGN AND IMPLEMENTATION OF ELECTRICAL POWER GRID-TIED INVERTER." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/63310047662111139507.
Повний текст джерела大同大學
電機工程學系(所)
94
The purpose of this thesis is to develop an inverter with grid-tied that can provide energy to share load with utility grid. The output power of inverter is 300 W and AC 110 Vrms for single phase. A full-bridge inverter with transformer, isolating primary and secondary side which can protect control circuit and avoid being burned when power stage has faults. A DSP of TI TMS320F2812 which is used to control the inverter in this thesis has high speed calculating function and make all control circuits flexible.
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.
Повний текст джерела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.
Wang, Chi-Yuan, and 王智源. "Design of Grid-Connected Hybrid Multilevel Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/bqu3d9.
Повний текст джерела國立虎尾科技大學
機械與機電工程研究所
98
This thesis proposed a hybrid multi-level inverters having 3 inverters in series with distinct dc link voltages to generate 13 voltage levels in order to reduce output voltage and current distortion and power switch stress and switching frequency. Therefore, EMI (Electro Magnetic Interference) can be alleviated due to lower switching frequency. The experiments are conducted to show the performance of the proposed hybrid multi-level inverters that in stand-alone system to reduce the voltage distortion significantly in load-variation, rectifier load, and phase-controlled load conditions; for the grid-tied system, the output current is closed to sinusoidal waveform and current ripple is reduced as well.
Hou, Chia-Shin, and 侯嘉信. "Design and Implementation of Grid-Tied Single-Phase PV Inverter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/63705105888646940486.
Повний текст джерела中原大學
電機工程研究所
99
The purpose of this thesis is to design and realize a gird-tied single-phase PV inverter. A straight-approach maximum power point tracking (SA-MPPT) is adopted to make the PV inverter work at MPP under different insolation. In this thesis, the boost converter can pump energy from the PV module to the PV inverter, in which the PV inverter can adaptively provide proper current with current control to the power utility according to the guidance of the SA-MPPT. The modeling and analysis of the current control in the inverter are conducted in detail. Finally, a prototype of 1kW PV inverter is designed and implemented to assess the predictions. The experimental result is in feasibility close to the estimation.
Lo, Cheng-Hsiao, and 羅正校. "Design and Implementation of Grid-Tied Inverter with Stationary-Frame Current Control." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/as42w2.
Повний текст джерела國立臺北科技大學
電機工程系研究所
99
The object of this thesis is to design and implement a single phase grid-tied DC/AC Inverter. The system is composed of a full bridge inverter with LCL filter and Texas Instruments TMS320F28035 as digital signal processor. The control scheme uses a stationary frame current controller as the unipolar voltage switching pulse-width modulation command. The design specifications are input DC voltage of 200 V, output voltage of 110 Vrms/60 Hz, power rating of 800 W, switching frequency of 12 kHz. Simulation and experimental results verify the control scheme can cope with input DC voltage 200 V and various load conditions, the inverter efficiency is higher than 90%, and the total voltage harmonic distortion is less than 5%.
Huang, De-Ming, and 黃德銘. "Development of a Grid-Tied Single-Phase Inverter with Programmable Output Power." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21638543712403084841.
Повний текст джерела國立臺灣科技大學
電機工程系
102
In recent years, the rapid industrial development, drastic increase in resource consumption, additional impact of the energy crisis, and the Fukushima Daiichi nuclear disaster, have urged people to focus on the necessity of various alternative energy sources and renewable energy technologies. Traditional electrical grids remain vital because stable new energy sources are still lacking. Thus, because grid-tied systems have become the primary application of new energy systems, discussions on grid-tied control technology are crucial. The objective of this study was to develop a single-phase boost-type forward converter to convert a storage battery voltage of 48 V to 200 V, providing energy to the DC-link side of a DC-AC converter. Additionally, a single-phase full-bridge DC-AC converter was used to connect to the grid side in parallel, transferring energy to the grid to supply loads. To conform to the liberalization of power industries in Taiwan and the contract capacities and unit electricity prices specified by power companies, power outputs to the grid side can be controlled based on electricity demands during various times. This study used a high-performance digital signal processor (TMS320F28335) produced by Texas Instruments as the control core of the overall system. The control strategies for the system were completed using software programs, thus achieving digitized system control to reduce hardware circuitry usage and increase system reliability.
Purnama, Irwan, and 潘宜銳. "A Simplified Analog Control Method for Grid-Tied Single Phase Boost Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/03784157335186377222.
Повний текст джерела國立臺灣科技大學
電子工程系
104
Nowadays, an inverter is purposed to convert and deliver the power from a DC power source to either the AC load or the AC grid. The conversion and integration of DC power source to the grid system become important since most of the renewable power sources are DC voltage source. There are some criteria that should exist in the configured conversion system such as high reliability, compact and low cost. To meet those criteria, two important strategies should be considered i.e. implementing a proper power inverter topology and designing high-performance control method. There are many inverter topologies proposed in many references for single-stage DC/AC power conversion. Differential boost inverter (DBI) is a kind of topology that can boost a lower voltage of the DC power source to a higher AC voltage. Among all the inverter topologies, this topology is very attractive since it is constructed from two bi-directional boost converters. Since each of the converters generates a DC-biased AC voltage, the inverter generates a differential output AC voltage which is obtained from the output voltage difference of the two-converter. In this work, one-cycle control (OCC) method is designed and implemented in a DBI. This control method is preferred to be implemented because of its advantages such as fast dynamic response and better perturbation rejection. Based on the triangle rule of the real-time integrator, OCC can track the variable reference voltage of the power converter. Therefore, the control method has an ability to follows a DC-biased AC voltage reference and to handle the input voltage perturbation. To connect the DBI to the AC grid, a power control shifting phase (PCSP) method is implemented in this work. In this method, the injected grid power is controlled by means of the inverter output voltage shifting phase. The power control is designed to achieve a unity power factor (PF) by implementing a zero reactive power reference so that only active power is injected to the AC grid. Both simulation and experimental have been done to verify that the designed controller can achieve a unity power factor with acceptable THD level.
Hsiao, Wei-Min, and 蕭瑋岷. "Design and Implementation of Grid-Tied Micro Inverter with Boundary Conduction Mode." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/23037002455973682660.
Повний текст джерела國立聯合大學
電機工程學系碩士班
100
Increasing pressure of the environmental protection and anticipative shortage of the conventional energy has called for the development of the regenerative energy. The solar power due to its inexhaustibility is the most important energy in the foreseeable future. How to utilize the solar energy efficiently and feed it to the grid is an important research topic currently. Not as the conventional large scale PV generation system with a large amoung of PV modules in series, this thesis presents the micro inverter which can feed the PV module power to the grid directly. The proposed inverter is composed of a flyback converter with current source output and a polarity inversion circuit. The variable frequency voltage mode control method are presented to operate the flyback converter in the boundary conduction mode (BCM) and control the output current of the inverter to be sinusoidal and in phase with the grid voltage. Modeling of the inverter and quantitative controller design of the variable frequency voltage mode control method is presented. A 120W experimental system with PV module for generating power is built. The effectiveness of the proposed method is confirmed with some simulation and measured results.
Lin, Yi-Te, and 林羿德. "Terminal Sliding Mode Maximum Power Control for Grid-Tied Photovoltaic Inverter Systems." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/40872919786556905989.
Повний текст джерела中原大學
電機工程研究所
100
This research presents a grid-tied inverter development for PV power generating systems with MPPT ability. The inverter regulates the output power of the PV array system by terminal sliding mode current tracking control with the MPPT algorithm. To efficiently increase the power tracking performance, we design a terminal sliding mode controller TSMC such that the system guarantees the finite-time convergence of inverter current tracking. Moreover, robustness against parameter uncertainties and disturbances are also considered in the controller design such that the controller is suitable for real implementation. Finally, both simulations and experiments are done to verify the feasibility of the proposed controller. In experiments, a grid-tied PV power generation system is constructed. The MPPT control strategy is implemented by TI DSP TMS320 F28335; therefore, the designed MPPT system not only comes with small size and high reliability, but also is contributive in grid-tied PV power system applications.
Liao, Hsiang-Yun, and 廖緗芸. "A Study on Grid-tied Modular Inverter Design for Micro-Turbine Generator." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/pk4s6r.
Повний текст джерела國立臺南大學
電機工程學系碩博士班
107
This thesis is aimed at researching a modular inverter circuit for micro-turbine power generation system. In the circuit the inverter are divided by basic and extended modules, in which basic module is used to perform power conversion required from micro-turbine generator while extended modules are designated for online redundant services. Through this design, it is not only beneficial to improve the reliability of energy production, but also owns high flexibility of capability extension. Furthermore, a current-sharing scheme as well as a modular inverter arrangement is developed for the achievement of uniform current dispatch of online inverter modules. The method proposed in this thesis was examined under various scenarios. The results help consolidate the feasibility and practicability of the approach for the applications considered.
Chen, Yu-Wei, and 陳昱維. "Analysis and Design of Digital Proportional-Integral Compensator for Grid-Tied PV Inverter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/54862698477882372563.
Повний текст джерела中原大學
電機工程研究所
101
This thesis is to realize a single-phase PV inverter driven by using digital-signal-processor-based sinusoidal-pulse-modulation (SPWM) controller. Digital proportional - integral (DPI) compensator is employed for system stability and harmonic suppression, which builds the analysis and design strategy. For system control and compensation, state-averaged analyses for system analysis and MATLAB for system simulation are conducted, respectively. Finally, a demonstrated prototype of 1.5kW PV inverter is realized to verify the theoretical analysis and simulation. Compared to analog proportional-integral (PI) control, the DPI control to the total harmonic distortion (THD) suppression does have good results and easy to implement in real design.
Venkatramanan, D. "Modeling, Analysis and Control of Reconfigurable Battery/Grid Tied Solar Photo-Voltaic Inverter." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5119.
Повний текст джерелаChen, Chan-Yi, and 陳展毅. "Analysis and Design of PI Compensator for a Grid-Tied Single-Phase PV Inverter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/04731989900265169900.
Повний текст джерела中原大學
電機工程研究所
100
The purpose of this thesis is to design and realize a gird-tied single-phase PV inverter and investigate a proportional-plus-integral (PI) compensator for system stability and harmonic elimination. In comparison with P controller, the PI controller can provide good ability for harmonic elimination to achieve lower total harmonic distortion (THD). In this work, a DC source like a DC bus from the boost converter and a reference signal from simulation solar panels after maximum power point tracking (MPPT) are used to regulate the output current to grid-tied utility. The system control including PI compensator is analyzed completely and its efforts are applied in the hardware implementation of a 1.5kW PV inverter to verify the estimated analysis and dynamic response. Finally, the harmonics and current THDs produced due to P and PI compensators are compared and analyzed with each other to investigate their performance on system.
Yi-NingXie and 謝亦甯. "Analysis of Current-fed Multiloop Control Strategies for the Grid-tied Single Phase Inverter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/n5u9k5.
Повний текст джерела國立成功大學
電機工程學系
106
In recent years, renewable energy resources have been promoting the wide development of distributed generation. Most of distributed generation supplies energy to the residential load by means of inverters tied with AC grid. The output of the converter is easily affected by non-linear loads that produces harmonics in the same power system. The output quality of the current fed inverter can be even worse the grid-tied mode. This study focuses on the multi-loop control strategies with harmonic compensation technique that is applied to the single-phase current-fed inverter. The main object is to improve the characteristic of transient response and reduce the total harmonic distortion of the output current at the point of common coupling. This study adopts the LCL filter at the port of inverter output to realize the multi-loop control strategies. Analyses of small signals for the single loop and multi-loop are conducted and the associated performance of the single-phase grid-tied inverter is validated by the simulation results and experimental results. Furthermore, test of the harmonic compensator has shown its function for improving the power quality.
Wang, Cheng-Hao, and 王政皓. "Maximum Power Point Tracking for a Grid-Tied Photovoltaic Inverter System Under Partial Shading Conditions." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/hukgvj.
Повний текст джерела中原大學
電機工程研究所
105
The photovoltaic panels have plural operational regions for power generation under partial shading conditions, such that the traditional maximum power point tracking(MPPT) methods will lead to local maximum power generation. To obtain the global maximum power generation, this thesis proposes a hybrid method by combining Shuffled Frog Leaping Algorithm(SFLA) and Perturb and Observe(P&O) algorithm. A grid-tied PV power generation system is taken as the application, where a boost converter and a full-bridge inverter are used to transfer the PV power for grid-tied systems. Moreover, the neural network based on fractional-order PI current control is used for the current regulation of the full-bridge inverter. Finally, numerical simulation and experimental results show the expected performance of the global maximum power point tracking under partial shading conditions.
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.
Повний текст джерела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.
Bala, Krishna Pagadala. "Modular Cascaded H-Bridge Multilevel Inverter with Distributed MPPT for Grid Connected Application." Thesis, 2017. http://ethesis.nitrkl.ac.in/8930/1/2017_MT_PBKrishna.pdf.
Повний текст джерелаDash, Prajna Paramita. "A High-Performance Three-Phase Grid-Connected PV System Based On Multilevel Current Source Inverter." Thesis, 2013. http://hdl.handle.net/10012/7356.
Повний текст джерелаHuang, Bo Xiang, and 黃柏翔. "Automatic Self-Matching Controller Design for Grid-Tied PV Inverter to Adapt the Change of Source Impedance and Solar Irradiation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/90651434451583088036.
Повний текст джерела長庚大學
電機工程學系
100
The effect of variation in source impedance and solar irradiation on control performance of PV systems is investigated. A proportional-resonant (PR) controller in the stationary frame in place of a proportional-integral (PI) controller in the synchronous frame was adopted to modulate a single-phase grid-tied inverter for the PV systems. Although the PR controllers have gained some momentum lately due to the advantages such as instantaneous tracking capability as well as low-cost computational resources, the tracking performance may decline in case of the change in source impedance and solar irradiation where conventional PR design rule is void. To adapt the PR controllers over diverse operating conditions without incurring excessive tracking error, an adaptive algorithm, which dictates the quality of the tracking performance, is proposed to search appropriate damping ratio for the PV systems. The control gains of the PR-controller can then be altered in light of the optimal damping ratio through a simple algebraic conversion. The proposed strategy was realized by a fully digital-controlled laboratory prototype which consists of a 1.5kW PV array and a grid-tied single-phase inverter. The experimental results confirm the performance of the proposed strategy.
Dash, Ashish Ranjan. "Investigation of Cascaded Multilevel Inverter Based SAF with Alternative Configurations Under Ideal and Nonideal Grid Voltage Conditions." Thesis, 2019. http://ethesis.nitrkl.ac.in/10125/1/2019_PhD_ARDash_514EE6022_Investigation.pdf.
Повний текст джерелаSajadian, Sally. "Energy conversion unit with optimized waveform generation." Thesis, 2014. http://hdl.handle.net/1805/6109.
Повний текст джерелаThe substantial increase demand for electrical energy requires high efficient apparatus dealing with energy conversion. Several technologies have been suggested to implement power supplies with higher efficiency, such as multilevel and interleaved converters. This thesis proposes an energy conversion unit with an optimized number of output voltage levels per number of switches nL=nS. The proposed five-level four-switch per phase converter has nL=nS=5/4 which is by far the best relationship among the converters presented in technical literature. A comprehensive literature review on existing five-level converter topologies is done to compare the proposed topology with conventional multilevel converters. The most important characteristics of the proposed configuration are: (i) reduced number of semiconductor devices, while keeping a high number of levels at the output converter side, (ii) only one DC source without any need to balance capacitor voltages, (iii) high efficiency, (iv) there is no dead-time requirement for the converters operation, (v) leg isolation procedure with lower stress for the DC-link capacitor. Single-phase and three-phase version of the proposed converter is presented in this thesis. Details regarding the operation of the configuration and modulation strategy are presented, as well as the comparison between the proposed converter and the conventional ones. Simulated results are presented to validate the theoretical expectations. In addition a fault tolerant converter based on proposed topology for micro-grid systems is presented. A hybrid pulse-width-modulation for the pre-fault operation and transition from the pre-fault to post-fault operation will be discussed. Selected steady-state and transient results are demonstrated to validate the theoretical modeling.