利用並聯變壓器分接頭之設定控制系統無效電力及電壓

Using Tap - setting of Parallel Transformer for Reactive Power and Voltage Control of Power System

謝建國(Chien - Gwo Hsieh)

指導教授 ： 朱文成

大同大學/電機資訊學院/電機工程學系所/碩士(2009年)

摘要

由於都市景觀及民眾的要求，大量傳統之架空線已被地下電纜取代。亦因地下電纜會產生大量的無效電力，而在某些時段會對電力系統造成電壓過高的現象。為解決此一過電壓問題，往往需要裝設無效電力控制設備作為改善。本論文提出將變壓器並聯運轉時，將分接頭設定值調整至不相同位置，產生循環電流而造成額外無效電力損失，以吸收系統無效電力，達到控制電壓之目的。本文利用變壓器並聯之等效電路推導出無效電力損失的公式，並計算在各種負載與分接頭設定值時，並聯變壓器可以消耗的無效電力，其結果証實可以取代並聯電抗器的功能。

關鍵字

分接頭設定 ； 無效電力損失 ； 並聯變壓器 ； 並聯電抗器

並列摘要

Due to the city landscape and the public request, a large numbers of the traditions overhead lines have been replaced by the underground cables. However, the effect on the underground cables results in producing the substantial reactive power, and the over-voltage situation sometimes occurs in power system. In order to solve this problem, the reactive power control equipment is usually needed to install for the improvement. Therefore, this thesis presents the adjustment of the tap setting of two parallel transformers within the different positions, instead of the investment cost. The result can bring about the circulating current so as to produce the additional reactive power, and then the surplus reactive power in power system can be absorbed in the hope that the voltage control is achieved. Based on the equivalent circuit of the parallel transformers, the formula of the reactive power loss attributing to the different loads and tap settings is deduced in this thesis. The consumed reactive power which is absorbed by parallel transformers is verified that the parallel transformers have the advantage of placing the shunt reactors.

並列關鍵字

tap setting ； reactive power loss ； parallel transformers ； shunt reactor

參考文獻

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