摘要
本論文設計及製作一基於離散滑動模式(Discrete Sliding Mode, DSM)控制器的三相直流/交流功率轉換器，應用在燃料電池發電系統上。以直流/直流全橋功率轉換器調節燃料電池之輸出電壓至400伏特再以三相直流/交流功率轉換器將直流鏈電壓轉換為三相220伏特60赫茲交流輸出。本論文分別以比例-積分(PI)控制器與離散滑動模式控制器，經由電壓空間向量脈寬調變技術(Voltage Space Vector PWM, VSVPWM)控制切換開關輸出三相交流電，調節電壓供給三相負載獨立運轉或調節電流聯結至電力網路並聯供電。實驗結果顯示，採用離散滑動模式(Discrete Sliding Mode)控制器對於負載變化有較快速的動態響應，較比例-積分(PI)控制器為佳，更適用於分散式發電系統。
本論文之系統以MATLAB/Simulink套裝軟體進行分析與模擬，以作為控制器設計之依據，並以數位信號處理器(DSP, TI TMS320F2812)為整體系統之控制核心，以軟體程式完成系統控制，降低系統硬體複雜度。本系統已完成866W的獨立供電及市電並聯系統。在獨立運轉下，其額定輸出線電壓有效值為220伏特，頻率為60赫茲。並聯運轉下，可提供實功率及虛功率至電力網路。此外，三相功率轉換器之運轉效率可達91%，而輸出線電壓之總諧波失真率為2.14%，符合IEEE Std. 519之規範。實驗結果驗證本文之理論分析及控制法則的可行性。

Abstract
This thesis presents the design and implementation of a three phase inverter of proton exchange membrane fuel cell(PEMFC) generation system, based on discrete sliding mode(DSM) controller. The PEMFC generation system consists of a full bridge DC/DC converter to boost the fuel cell voltage (40 V) to 400 VDC, and the three phase DC/AC inverter is employed to produce 220V, 60Hz AC outputs. The DSM controller and PI controller, based on voltge space vector pulse width modulation (VSVPWM), is proposed to regulate voltage for stand-alone fashion or current for connected with power grid, separately. The experimental data show that while variance in load, the inverter of DSM controller has faster dynamic response than that of PI controller.
In this thesis, the mathematical models and controller designs are built and simulated by MATLAB/Simulink. Then, a digital signal processor (DSP, TI TMS320F2812) is used to control the system for reducing the circuit complexity. A prototype of 866W PEMFC power conversion system is developed under stand-alone and grid-connected operation, separately. The system can feed proper power to the grid in grid-connected operation, while for stand-alone operation, the rated line-voltage is 220V and the frequency is 60Hz. Besides, efficiency of three phase inverter reaches 91% and voltage harmonic distortion of three phase power inverter output is 2.14%, which complies with IEEE Std. 519. Finally, simulation and experimental results are given to justify the analysis.

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