本文旨在研製極小型三相永磁式同步風力發電機及其驅動系統，包括水平軸型葉片、永磁式同步電機，以及電動機與發電機模式下運轉所需之雙向功率轉換器。本研究使用有限元素分析軟體Maxwell/2D分析永磁式同步發電機，並比較不同極數與佔磁比下之感應電動勢相電壓的總諧波失真率，以完成幾何結構的設計與實作。文中提出三相三臂型雙向功率轉換器之六步方波控制，以驅動三相永磁式同步電機。其中，在電動機模式下，本系統使用轉速閉迴路控制策略；而在發電機模式方面，則採電流閉迴路及最大功率追蹤控制，可調節出不同風速之最佳電流命令。另外，本文採用數位霍爾效應元件的信號作六步方波區間判斷及轉速的回授，可降低成本；而水平軸三葉型葉片之使用，則有周速比高、啟動轉矩低之優點，意即在低風速的環境下可順利達到期望的發電機轉速，並抽取功率。
三相永磁式同步電機在發電機模式於180 rpm的感應電動勢峰值分析結果為11.51 V，總諧波失真率為1.46 %，其對應之實測值為11.43 V 及1.60 %，驗證本文分析的準確性。另者，本文之驅動系統以32位元數位信號處理器TMS320F28069為控制核心，有關之控制策略大都由軟體程式執行。在電動機模式下，直流鏈輸入電壓為12 V，達到穩定運轉於轉速60 rpm之需求；而於發電機模式下，在對應於6 m/s風速之發電機轉速160 rpm，以及發電機相電流命令為1.8 A 的情況，直流側輸出電壓、電流及功率分別為20 V, 1.2 A與24 W，定電流充電之電流為0.8 A。本文之計算機模擬與實測結果驗證了系統設計與控制策略的可行性。

This thesis presents the analysis and implementation of three-phase permanent-magnet synchronous generator (PMSG) and its drive system, including horizontal wind turbine, permanent-magnet synchronous machine, bidirectional power converter for motor as well as generator modes of operation. Finite element analysis (FEA) software Maxwell/2D is used to determine PMSG's geometry for physical build-up through the comparison of the total harmonic distortions (THD) of induced electro-motive-force for different pole numbers as well as magnet pole-arc to pole-pitch ratios. Three-phase three-leg bidirectional power converter using six-step square-wave pulse-width modulation is proposed to drive the synchronous machine. Specifically, in motor mode, speed closed-loop control is given to drive permanent-magnet synchronous motor. While in the generator mode, current closed-loop and maximum power point tracking controls are introduced for PMSG to yield optimum phase current commands corresponding to various wind speeds. Futhermore, digital Hall-effect sensors are used to detect the rotational speed with low cost. As for the wind turbine blades, three-blade horizontal wind turbine, which has the advantages of high tip-speed ratio and low pull-in torque, is proposed to result in the expected rotational speed and generate the power in the low wind speed environment.
FEA shows the no-load voltage of this machine under generator mode at 180 rpm is 11.51 V, and the THD is 1.46 %. The corresponding experimental results are 11.43 V and 1.60 %, respectively. Close agreement between analysis and measurement is obtained. In addition, the 32-bit digital signal processor, TMS320F28069, is adopted as the control core, and most of the control strategy is accomplished by software program. Experimental results show that under the motor mode, with the dc-link input voltage of 12 V , the motor can reach the rotational speed of 60 rpm and operate stably. Whereas, in generator mode, under the wind speed of 6 m/s, which is equivalent to the rotational speed of 160 rpm, generator phase current command of 1.8 A will yield output dc voltage, current and power of 20 V, 1.2 A and 24 W, respectively, with the constant battery charging current of 0.8 A. In short, both the simulated and experimental results verify the feasibility of the proposed system design and control strategy.

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