本文旨在研製應用於三相雙繞組永磁式同步風力發電機系統之交流-直流-交流功率控制器。本系統設計交流-直流-交流功率轉換器，將風力發電機所產生之變動頻率及電壓之三相電源轉換為固定頻率及電壓之單相電源。文中採用三相雙繞組永磁式同步發電機，不僅可提高發電機之容量，亦可降低整流後直流電壓的漣波成分。本文之系統藉偵測功率轉換器之直流鏈電壓、發電機之線電壓及線電流，調節發電機之功率，使永磁式同步發電機達到定電流及定功率的輸出，可與市電網路並聯或獨立運轉。
在發電機側之交流-直流功率轉換器分析方面，本文推導三相全橋半控型整流器之數學模式，並採用三相開關循序切換控制，不需轉速回授元件即可達成具變速性能之永磁式同步發電機功率控制，以達到發電機與直流鏈功率平衡，提供穩定的直流電源輸出。
蓄電池組以昇/降壓式直流截波器作為放電與充電之路徑，風力不足時使用定電壓控制，提供負載能量，充電則採二階段式定電流-定電壓控制，完成能源調節及分配。當風速變化時，依據負載所需之功率，決定電池組儲、釋能之控制，維持負載端電壓為固定值，而不受發電機轉速的影響，同時，本系統多餘之電力亦可儲存於蓄電池組。
負載側或並聯市電側之直流-交流功率轉換器將採用單相三階層直流-交流功率轉換器，以減少輸出電壓之諧波含量，並使用低損失之單極式正弦脈波寬度調變技術以提高轉換效率。系統在獨立運轉及與市電網路並聯運轉時，本文分別採用電壓控制模式與電流控制模式，且完成控制參數的設計。在控制策略方面，則採用具相位補償之振幅鎖定迴路，於負載變動下提供快速響應、穩定且低諧波失真之單相電壓源予負載使用。
本文已建立交流-直流、直流-直流及直流-交流功率轉換器之模式，並以套裝軟體Matlab/Simulink模擬，作為系統控制器設計之依據。實體製作方面，採用高性能及低成本之數位信號處理器(DSP，TMS320F2812)為整體系統之控制核心，其控制策略皆由軟體程式完成，不但減少硬體電路成本，並增加系統運作可靠度。本文已完成750W發電系統雛形，由模擬及實測結果顯示，本系統在獨立運轉下，其額定輸出電壓有效值為110/220V，頻率為60Hz，在並聯運轉下，可提供功率至電力網路，且整體系統之運轉效率為83%。單相三階層變流器輸出電壓之總諧波失真率為1.23%，符合IEEE Std. 519之規範。

This dissertation presents the application of ac-dc-ac power controllers to wind power systems with three-phase double-winding permanent-magnet synchronous generators. In this system, ac-to-dc and dc-to-ac power converters are proposed to convert three-phase electrical power generated by wind with varying-voltage and varying-frequency to single-phase electrical power with constant-voltage and constant-frequency. The proposed three-phase double-winding permanent-magnet synchronous generator, which consists of two identical windings in stator, can not only yield higher power density than that of its single-winding counterpart, but also reduce the voltage ripple at the output of rectifiers. The output power of the overall system is adjusted by detecting the dc-link voltage of power converters as well as the line voltage and line current of the generator. The system can be operated in both stand-alone and grid-connected fashions.
In ac-to-dc power converter, the mathematical model of half-controlled, three-phase rectifier is built to implement the sequential-switching of switches on power converter, therefore, no rotor position detector is needed for power converter connected with generators. This can yield power balance between generator and dc-link to supply the dc power stably.
The buck/boost dc chopper is designed to charge and discharge the battery set. The two-stage fixed-current and fixed-voltage control is adopted to charge the battery set, while fixed-voltage control method is used to supply load power when wind speed is low. On the other hand, if power imbalance between generator and dc-link occurs, the buck/boost dc chopper can adjust the power balance through batteries and sustain a constant dc-link voltage. In addition, the surplus electricity can be stored into batteries to enhance the overall efficiency of the proposed system.
A single-phase, three-level dc-to-ac power converter using unipolar switching method with low switching loss is designed to reduce the output voltage harmonics and increase conversion efficiency. The realized system can be operated either in a stand-alone fashion or connected with power grid by voltage and current control modes, respectively. The dc-to-ac power converter operated under voltage-controlled mode using phase-compensated amplitude-locked loop algorithm can provide a single-phase source with fast response, stable and low harmonic distortion power to load.
In this dissertation, the mathematical models of ac-to-dc, dc-to-ac power converters, and buck/boost dc chopper are built and simulated by Matlab/Simulink. Then, a high-performance and low-cost digital signal processor (DSP, TMS320F2812) is used to control the system for reducing the circuit complexity. A prototype of 750 W hybrid power conversion system is developed under stand-alone and grid-connected operations, separately. The system can feed proper power to the grid in grid-connected operation, while for stand-alone operation, the rated output voltage is 110/220 V and the frequency is 60 Hz. Besides, the experimental data show that the efficiency of the whole system in grid-connected operation reaches 83% and the voltage harmonic distortion of single-phase, three-level dc-to-ac power converter output is 1.23%, which complies with IEEE Std. 519.

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