- 學位論文
抑制電力電容器組開關暫態之研究
Study to Reduce the Switching Transient of Power Capacitors
摘要
穩定可靠的供電是台灣電力公司的不變目標，而隨著台灣產業的升級，更需要良好的電力品質，尤其在電壓穩定方面。為此，台電增設許多電力設備以維持較佳電壓品質，其中安裝在變電所的並聯電容器組為一種調整電壓的方法。 雖然並聯電容器的設置可用於調整電壓，但亦相對地衍生許多問題，其中包含暫態過電壓、突入電流、暫態再襲電壓所造成電力設備的損壞，台灣電力公司雖然於電容器組裝設限流電抗器以改善暫態過電流的問題，但實際上電容器組損壞的問題亦仍存在，依據既往電容器組的運轉經驗，曾有發生過電容器損壞及其所屬斷路器接點熔損，而造成毀損着火的事故。因此，如何避免投切頻繁的電容器組發生嚴重的事故，即為本論文研究探討的動機。 本論文針對台灣電力公司既設69kV、22kV/11kV的電容器組模型，以MATLAB SimPowerSystems程式分析模擬其各種暫態現象，然後根據模擬結果，進一步分析及探討工程可行性及經濟性，並利用電力系統負載離峰期間選擇西湖配電變電所進行電容器組及限流電抗器裝設位置的改變前、後，電容器組開關投、切的暫態電壓及暫態電流之實際量測，並將改善前後的效果與模擬結果進行比較。研究發現，改變電容器組及限流電抗器之裝設位置確實可以解決22kV/11kV中壓電容器組開關投切的暫態問題，這項研究結果可以提供台灣電力公司及中壓供電的產業公司作為規劃設計電容器組結構之參考。
並列摘要
Stable and reliable power supply is the major concern of Taiwan Power Company (TPC). To keep pace with the upgrading industries in Taiwan, TPC needs better quality in power supply, especially in the voltage's stable aspect. In order to maintain good voltage quality. The parallel connection bank of capacitors was installed at substations as a means of regulating voltage. The condenser bank can be used for regulating voltage, it also generates many problems. For example, it will contain transient over voltage, inrush current, and transient re-striking voltage that may cause damage to the electrical equipment. Although TPC installed current limit reactor in the capacitor bank to improve the transient over current, the capacitor damage problem still exist. How to avoid such capacitor bank incident is the research motivation of this thesis. This thesis focuses on TPC’s 69kV, 22kV/ 11kV bank of capacitors model and use the MATLAB SimPowerSystems program to simulate all kinds of transient phenomenon. The simulation results are further analyzed and adopted for feasibility and efficiency study. In this study, TPC’s West Lake distribution substation was sampled for realistic measurement of the bank of capacitors and the limit current reactors’ position change. It is found that change to the position indeed can solve the 22kV/11kV capacitor bank transient problem. This result can be used as structure reference for both TPC and other high voltage supply companies in the layout design for the bank of capacitors.