傳統型架構電壓動態恢復器雖已能協助解決市電欠電壓之問題，但在市電過電壓之問題解決上，仍較為有限，因此本論文即考慮包括功率角、功率因數及市電電壓變化等因素，詳細分析整個系統之功率潮流變動，並藉由適當之控制，可將電壓動態恢復器保持單向之功率傳遞，不僅使動態電壓恢復器可補償市電之欠電壓，也同時兼具修正市電過電壓之能力，可避免發生功率逆送之情形，以確保重要負載下可免於受到市電電壓變動之干擾。而為評估掌握本文所提方法之可行性，本論文並應用電路模組化之設計概念，完成動態電壓恢復器電路之實現，並經由實際電路測試、模擬及理論分析予以驗證，可得知本文所提之系統架構確有助於負載電壓之穩定，應有助於電力品質研究之施行及參考。

Conventional dynamic voltage restorer can help solve the under-voltage problem, yet for the over-voltage problem, its efficiency was seen limited. Therefore, in this thesis, a transformerless dynamic voltage restorer is proposed, where the power angle, power factor and mains voltage variation were all taken into considerations. With the appropriate control made in this proposed approach, the method not only helped compensate the under-voltage phenomenon, but also owned the capability of correcting the mains over-voltage problem. In the mean time, with the assistance of the proposed system, the voltage variation disturbance can be also better alleviated. To validate the effectiveness of such a method, a prototype circuit was simulated, implemented and tested. From those test results revealed, they helped consolidate the feasibility of the method in maintaining the voltage stability at demand side. This outcome can be also provided as the reference for electric power quality improvement study.

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