由於部分電力用戶對電力品質之要求日趨重視，且其負載端之設備容量亦已日益增加，故本論文提出之動態電壓恢復器係採電路模組化設計俾於未來容量擴充之需，而本設計係採雙模組並聯運轉形式，其中電壓控制式變流器係擔任主模組，且利用雙迴路控制電路中之外迴路完成輸出電壓之控制器，使系統在穩態操作下，其負載端具備穩定之電壓，另利用內迴路完成電流之控制，以協助改善系統之動態響應，此外，本電路模組中之電流控制式變流器則係擔任副模組，並依照負載電流之分配驅使補償功率達到均分之目的，進而增加系統補償容量。本文經由電壓控制式變流器與電流控制式變流器之模組化整合後，於系統運轉時，不僅可藉由偵測電路擷取系統訊號，用以控制變流器進行市電欠電壓之補償工作，更亦兼具修正負載端電壓波形之功能，使負載端設備均可於良好供電品質下運轉。為評估掌握本文所提方法之可行性，本論文將所提之架構經由實際硬體電路測試、模擬以及理論分析予以驗證，由測試結果可知，其確已達到改善電力品質與增加容量之目標，並應有助於電力品質研究之應用與參考。

Following the increased concern of electric power quality along with high capacity requirements of installed equipment nowadays, a modular design of dynamic voltage restorer is thus proposed in this thesis with the consideration of the future capacity expansion. In the circuit design of the proposed method, two modules are operated in parallel, where the voltage-controlled inverter is severed as the primary module and the current-controlled inverter is auxiliary module. In the primary module where the two-loop control circuit is employed, the load voltage is well stabilized by outer-loop control circuit and the dynamic response is significantly improved through the inner-loop one. As for the auxiliary module, the current-controlled inverter of this module is applied to reach the current distribution among different modules such that the compensation capacity can be better increased. To operate this proposed system, the voltage-controlled inverter would be integrated with the current-controlled inverter. Then, once the undervoltage signal is detected, the voltage would be compensated immediately such that the waveform at the load side can become more sinusoidal. To validate the feasibility of this proposed approach, this method has been tested through software simulations and hardware implementation. Test results show that the method has reached the goal of power quality improvement and capacity expansion, which are also deemed beneficial for electric power quality study and application

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