Design and Implementation of Power Conversion Circuits for Ocean Current Power Generation System

[[abstract]]近年來石油價格不斷的攀升，尋找綠色再生能源已成當務之急。綠色再生能源不外乎太陽能、海流發電與風力發電，而如何將這些綠色能量有效率的轉換成電能是非常值得研究的課題。永磁式同步發電機存在非線性的特性曲線，其最大功率點位置會隨著海流狀況的不同而有所改變。為了使海流發電系統在任何流速下皆可操作在最大功率點，本文利用三相橋式全波整流作為交流-直流功率轉換，藉由回授全橋轉換器輸出之直流鏈電壓、電流信號給16位元數位信號處理器(Microchip dsPIC 30F4011)調整全橋轉換器之功率開關責任週期，以擾動觀察法追蹤海流發電機的功率輸出，使得海流發電系統工作在最大功率點。最後以實驗設計之田口方法及雙反應曲面法找出影響海流發系統輸出功率之因素，以輸出功率最大為其設計目標，使得系統設計於最佳化之參數。[[abstract]]In recent years the oil prices keep going up The most important issue is to find out the renewable energies such as the solar power the ocean current power and the wind power generations to substitute the oil It is very worthy to investigate how to effectively transfer the renewable energies into the electrical energy The maximum power point of the permanent magnet synchronous generator will be varied with the flow rate variation of the ocean current because of the non-linear property of the permanent magnet synchronous generator To keep the maximum output power under any flow rate of the ocean current in this thesis the control method includes the following concept First a AC/DC rectifier is employed to transform a AC voltage into a DC voltage In maximum power point tracking (MPPT) method the output voltage and current produced by a full-bridge converter will be transmitted to a microprocessor (Microchip 30F4011) such that the microprocessor can further provide with an adjustable signal according to the output voltage and the current so as to adjust the duty cycle of the control signal to driver the full-bridge converter Furthermore the design of experiments (DOE) will be employed to find out the maximum output power for the ocean current power generation system The Optimum parameters make the system operated on maximum powe