對於近來電力電子技術的發展與數位控制的進步，工業應用上所採用之電機設備，對於電力系統所發生之電力品質問題相當敏感。對於接地故障造成之電壓驟降問題，造成敏感性負載因欠壓而導致生產程序中斷。因此工業應用上，可利用串聯式電壓驟降補償器解決敏感性負載相關電力品質問題。對於串聯式電壓驟降補償器所採用之耦合變壓器，本文提出一種新的方法以抑制串聯變壓器之湧浪電流。當補償電壓投入時，串聯變壓器因飽和現象造成暫態湧浪電流發生，湧浪電流為穩態時之變壓器激磁電流十倍以上，不僅對變壓器造成損害，同時造成補償電壓無法傳送至市電側，使補償性能降低。本文將利用湧浪抑制控制法將補償電壓命令之等效磁通量加以抑制，使等效磁通量不會超過變壓器飽和點，以消除湧浪電流。以湧浪抑制控制法雖可消除串聯變壓器之湧浪電流，同時亦會降低補償器起始之暫態輸出電壓，然而若可有效抑制湧浪電流，得以額定容量較小之串聯變壓器，達到串聯式電壓驟降補償器之設計要求，同時可減少補償器之重量，降低成本。

本文將以電腦模擬及實際電路實驗結果，驗證所提之串聯式電壓驟降補償器系統架構，論文內容為緒論、文獻回顧、控制原理、模擬結果與分析、實驗結果與分析以及結論等六個章節，詳細說明串聯式電壓驟降補償器之控制原理與整體系統性能。

Due to the progress of power electronics technologies in recent years, industrial manufacturing equipments are very sensitive to the power quality events of the utility grid. Voltage sags often cause undervoltage fault in sensitive loads, and interrupt the production process. The series-connected voltage sag compensator has been adopted by industries to maintain the power quality received by sensitive loads. The series coupling transformer of the voltage sag compensator often draws significant inrush current when the compensation voltage is injected. The saturation of the transformer during inrush reduces the output voltage and causes degradation of the compensation voltage, and the inrush current may also trigger the over-current protection of the compensator. In this thesis, an inrush suppression method is proposed. The proposed method can prevent magnetic saturation by limiting the flux-linkage during the starting transient of the compensator. The proposed method can reduce the capacity requirement of the serial coupling transformer, and increase the power density of the compensator system.

The proposed inrush suppression method is presented and analyzed in this thesis. Computer simulation and laboratory experimental results are presented to verify the performance of the proposed system.

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