並聯電容器組切換暫態現象之探討分析

Investigation and Analysis of Switching Transient for Shunt Capacitor Banks

陳家富(Chia-Fu Chen)

指導教授 ： 洪穎怡

中原大學/工學院/電機工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400390

摘要

電力系統中包含許多複雜電磁暫態現象，其中電容開關切換會產生異常過電壓及極大突入電流威脅電力設備。雖然過去有許多文獻提出關於電容開關暫態探討及抑制方法;但電容開關暫態突波造成的事故仍頻傳。本報告為探討異常發生原因，尋求改善及解決方案，以避免類似事故一再發生。首先針對並聯電容器組中少數電容器單體燒損後造成中性點電壓不平衡現象，分析電容器單體因而承受的過電壓，適時將並聯電容器組予以切離，防止系統產生更大損害。再彙整了一般常用的抑制方法，透過實際台電電力系統上變電所的並聯電容器組切換，利用MATLAB/SIMULINK 模擬軟體得到模擬結果對照分析。本報告彙整抑制方法及模擬結果可在實際系統上應用，減少電容開關暫態突波事故發生率。

關鍵字

暫態再襲電壓 ； 並聯電容器組 ； 暫態過電壓 ； 突入電流

並列摘要

They are many complicated magnetic transient phenomena in the power system, in which the capacitor switching producing abnormal overvoltage and extremely surge current would menace the power equipments. Although many existing papers presented some methods to remedy the capacitor switching transients in the past, the capacitor accidents of switching transients still happen all the time. Some methods to improve and solve process for searching those abnormal causes in this report are provided, avoiding the similar cases happen. First, the phenomena about neural voltage imbalance caused by few capacitors burnt in the shunt capacitor unit are presented, capacitor unit overvoltage is analysed for switching off shunt capacitor bank at proper time to prevent more damages in the system. Then, common remedy processes are collected. The Taipower system was used to be a test system for illustrating the capacitor switching using MATLAB/SIMULINK. Through the remedy method collection and simulation results upon a realistic system, the accidents caused by capacitor switching can be reduced.

並列關鍵字

shunt capacitor bank ； inrush current ； transient overvoltage ； Transient restriking voltage

參考文獻

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