| Summary: | 碩士 === 國立聯合大學 === 電機工程學系碩士班 === 102 === Renewable energy (RE) based distributed generations and micro-grids are the trend of future development of the electrical power supply system. In recent years, a number of distributed generations based on various RE have been proposed, photovoltaic power is one of the potential options. In this thesis, a high-performance three-phase inverter system is proposed for the grid-connected photovoltaic power generation system. The proposed inverter system can perform simultaneously the bidirectional real and reactive power regulations integrated with the function of active power filter. In order to improve the dynamic performance and stability of the system, the neural network assisted PI controller is utilized for achieving the features of adaptability and fast dynamic response. The proposed hardware system includes a DC power supply emulating the photovoltaic power unit, battery bank, grid-tied three-phase inverter and the nonlinear load unit. In this thesis, various functional control cases are firstly developed according to the system operating needs in day and night, then the operating principles of the three-phase inverter system and the design tasks of related controllers are investigated. Next, the feasibility of the proposed scheme is validated by using simulations on Matlab software. Finally, a small-scaled hardware system with the dSPACE 1104 as the main controller and the associated interface circuitry are constructed. The effectiveness of the proposed photovoltaic inverter system and the performance of the related controllers are verified with measured results.
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