本論文提出一並聯輸入串並聯輸出直流/直流隔離型轉換器，該轉換器適合應用在寬電壓範圍如風力渦輪發電機，所提之架構主要由三組不同額定功率之相移式全橋轉換器及一串並聯切換電路構成。三組轉換器的輸入端以並聯型式連接，輸出端則連接至一串並聯切換電路，藉由切換機制使轉換器輸出端具有並聯或串聯等九種不同的連接狀態，並透過系統輸入電壓與功率值來判斷操作模式。當輸入電壓低時輸出側為串聯模式以達成高電壓增益；當輸入電壓較高時為並聯模式以共同分擔功率。搭配擾動觀察法的最大功率追蹤策略實現從輸入源獲得最大功率輸出。另一方面，探討系統在並聯操作時的功率調度策略，事先量測三組轉換器之效率特性，並使用離線粒子群演算法求解系統在功率範圍內最大效率之最佳功率調度，使用德州儀器公司所產的數位信號處理器（DSP TMS320F28069）作為數位控制器，為簡單起見，各轉換器之負載變化狀況有三條近似線性分布的方程式被建立在數位控制器，調度系統在並聯模式下效率最佳化之各轉換器功率，最後，本文建立一400V/5kW實測系統進行性能試驗與量測，並可操作於輸入範圍45V~400V，透過模擬與實測驗證所提出架構之可行性。

This thesis proposes an input-series and output-series-parallel DC/DC isolated converter, which is suitable for application with wide voltage range, such as wind turbine generator. The proposed structure consists of three phase-shift H-bridge converters with different power ratings and a series-parallel-switching circuit. The input ports of the H-bridge converters are in parallel directly, while the output ports can connect in parallel and/or series through a switching mechanism, which provides nine different configurations of the output ports of the three H-bridges. The level of input voltage and power determine which configuration to select. The series configurations provide high voltage gain for low level of input voltage, while the parallel ones operate under higher voltage and share the power. In this thesis, through the perturbation and observation method to achieve the maximum power point tracking for obtaining the maximum power from the input source. Moreover, this paper investigates the strategy of power dispatch when parallel configuration operating. The efficiency characteristics of the three different-rating H-bridge converters are measured in advance, and an off-line particle swarm algorithm solves the optimal power dispatch to maximize the system efficiency for a certain power range. A DSP-based controller (TMS320F28069) produced by Texas Instruments which executes the necessary progress of the proposed system. For simplicity, three nearly linear distribution equations for each H-bridge converter is established in the digital controller to dispatch suitable power of each converter for maximizing system efficiency under parallel configuration. Finally, this paper establishes a 400V/5kW prototype to verify, measure, and evaluate the proposed system. The proposed system worked well under the input range varying from 45V to 400V. Both simulation and experimental results demonstrate the validity of the proposed converter.

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