本文旨在研製小型風力發電用之控制系統。本系統是利用雙三相永磁式同步發電機所產生之變動電壓及頻率的交流電壓，轉換為固定電壓及頻率之單/三相電源，最後與市電併聯。電路架構主要包含交流-直流功率轉換器、昇/降壓型直流-直流功率轉換器及單/三相直流交流功率轉換器。交流-直流功率轉換器採用全橋式二極體整流器、直流-直流功率轉換器採用兩組昇壓/降壓型直流-直流功率轉換器，具有昇壓及降壓功能，輸入及輸出電壓可用範圍變廣，採用兩組可以有分流效果以提高效率及硬體的可靠度。其中還利用發電機交流電壓回授作零點偵測，以計算其發電機轉速，配合發電機轉速作最大功率追蹤控制，最後由全橋式單/三相直流-交流功率轉換器與市電併聯。
本文以高性能的數位信號處理器TMS320F28035為整體系統之控制核心，系統功率轉換器控制及能量管理策略皆由軟體完成。本文主在系統整合，已在實際風場10m/s風速下，發電機發電量為160W，成功對單相市電220V及三相市電220V作市電併網，單相市電併網系統輸出功率為136W，運轉效率為85%，三相市電併網系統輸出功率為132W，運轉效率為82.5%，直流-交流功率轉換器之電流之總諧波失真率分別單相為6.58%、三相為5.69%，實驗結果驗證本文之理論分析及控制法則的可行性。

關鍵詞：單相市電併聯、三相市電併聯、變頻器、直流-直流功率轉換器、最大功率追蹤。

This study is aimed to develop a control system for a small wind power system. In this control system, the varying-voltage and varying-frequency AC voltages generated by double three-phase windings synchronous permanent-magnet generators are converted to the constant-voltage and constant-frequency AC voltages, and are eventually connected to the grid. The circuit structure mainly includes: (1) an AC-DC power converter; (2) a step-up/down DC-DC power converter; (3) a single-/three-phase DC-AC power converter.The DC-AC power converter uses the three-phase full-bridge rectifier, and the DC-DC power converter uses two step-up/down DC-DC power converters, which conduct the function of stepping up/down voltages. Since the usage ranges of input voltage and output voltage are extended, the use of two DC-DC step-up/down power converters, which function as the current shunt, can improve the efficiency and the reliability of the system. Moreover, the feedback of AC voltage produced by the generator is used to perform the zero detection, and then the generator speed can be calculated. Finally, in concert with the maximum power tracking control, the full-bridge single-/three-phase DC-AC power converter is used to be connected with the grid.
This research adopted a high-performance DSP, TMS320F28035, as the control core for the whole system, and the control of system power converter and energy management strategy are all completed with software. The main goal of this research is the integration of system. The developed wind turbine has been successfully connected to utility with single-phase 220V and three-phase 220V. The generation of wind turbine can be 160W as the wind speed is at 10m/s. The operation efficiency under the real test can be 85.2% for the connection with the utility of the single-phase system, and 82.8% for the connection with the utility of the three-phase system. Moreover, the total current harmonic distortion (THDI) of DC-AC power converters is 6.58% for the single-phase system and 5.69% for the three-phase system. The test results show the feasibility of the proposed system and its control strategy.

Keywords：single-phase grid-connection, three-phase grid-connection, inverter, dc-dc power converter, maximum power tracking control.

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