本論文提出一種新的直流/直流轉換器系統，系統主要由三台相移式全橋轉換器所組成。這三台相移式全橋轉換器輸入側並聯連接，而輸出側可透過串並聯切換電路做串聯或並聯連接，系統提供了九種不同輸出連接模式做切換，由風力發電機所輸出的電壓值來判斷。在較低的切入電壓時，使用三台轉換器串聯輸出來達成高輸出電壓增益。當風力發電機達到額定輸出功率，此時風力發電機所提供電壓為最高電壓，而三台相移式全橋轉換器輸出端採用並聯連接分擔輸出電流。本論文所提出的轉換器主要提供了應用於大範圍輸出電壓的風力發電機，並且在整個操作範圍內得到更高的效率，而使用三台相移式全橋轉換器有不同的額定功率，其與使用單台轉換器比較有著成本較高的缺點。而對於風力發電機所使用的最大功率追蹤法則為大家熟知的擾動觀察法。本論文建立一5kW系統進行評估以及測試，並透過實驗結果來驗證提出架構的可行性。

This paper proposes a novel topology for a DC/DC conversion system, which consists of three phase-shift H-bridge converters. The three input sides of the H-bridge converters are paralleled directly, while the output sides can be connected in parallel and/or series through a switching mechanism, which provides nine different connection configurations determined by the value of the input voltage generated and rectified from a wind-turbine generator. Lower cut-in voltage can be achieved by connecting the output sides of the three H-bridge converters in series to obtain high voltage gain. When rated power of the wind turbine is reached, the generator provides highest voltage, the output sides of the three H-bridge connect in parallel to share the load current. Thus, the main aims of the proposed converter are to provide a wider available operation range of the wind turbine and to obtain higher efficiency of the converter system over the whole operation range. Nevertheless, using three individual converters with different rated power is cost inefficiency compared with working by one single converter, and this is a disadvantage of the proposed system. The well-known load-disturbance method is used to track the available maximum power generated from the wind turbine. A 5kW prototype was built for evaluation and test. The experimental results demonstrated the validity of the proposed converter.

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