本文旨在研究無轉速偵測裝置之永磁式同步發電機的控制並應用於小型風力發電系統。本系統採用交流-直流-交流功率轉換器，將風力發電機所產生之變動電壓及頻率轉換為固定電壓及頻率之單相電源。在交流-直流功率轉換器方面，本文推導三相全橋全控型整流器之數學模式，並採用同步旋轉座標系統之鎖相迴路，估測發電機之同步角位置，以改善角度偵測器的缺點。如此可降低發電機之電流諧波含量及提高功率因數，以提高效率。風力發電系統之最大功率追蹤控制採用擾動觀察法，觀察發電機輸出功率的變動，並作電流命令的調整，決定下個責任周期命令。單相直流-交流功率轉換器方面，推導單相直流-交流功率轉換器模式，並以電流控制策略及單極性之脈波寬度調變提供快速響應並與單相市電併聯。
　　本文之系統以低成本及高性能的數位信號處理器(DSP，TMS320F2808)為控制核心，完成實體製作。系統整合部分，發電機運轉於90rpm時，完成465W與市電併聯，其單相輸出電壓有效值為220V，頻率為60Hz，單相市電側的電流諧波失真率為13.77%，整體系統效率為86.11%。本文發電機轉速運轉在10m/s~12m/s風速時，均可維持穩定的輸出電流，以提供單相直流-交流功率轉換器併聯於市電。實驗結果驗證本文之理論分析及控制法則的可行性。

This thesis presents the control of speed sensorless permanent-magnet synchronous generators. In this system a novel ac-dc-ac power converters is proposed to convert three-phase electrical power generated by wind with varying-voltage and varying-frequency to that of single-phase with constant-voltage and constant-frequency. In ac-dc power converter, the mathematical model of three-phase rectifier built under rotating-frame and synchronous frame phase-locked loop is used to estimate rotor position. This requires no rotor position detector and thus increases the reliability of the system. Wind power generation system with maximum power tracking control perturbation and observation method is proposed to observe the changes in generator output power and make adjustments to current orders for the next duty cycle. A single-phase dc-ac power converter using unipolar switching method with low switching loss is designed to reduce the output current harmonics and increase conversion efficiency. As mentioned above, the realized system can be operated in parallel with the power grid by voltage and current control models.
The high-performance and low-cost digital signal processor DSP,TMS320F2808 is used to control the power converter. When generator runs at 90rpm, a prototype of 465W power conversion system is developed for grid-connection. The single-phase grid-connected operation yields the output voltage of 220V, 60Hz. Besides, the experimental data show that the efficiency of the whole system reaches 86.11% with current harmonic distortion of 13.77%. This generator can maintain a stable output voltage to provide a single-phase DC-AC power converter and grid-connected operation when speed is running between 10m/s to 12m/s. Experimental results are shown to verify the feasibility of the proposed scheme.

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