應用於雙饋電迴路之整合電力品質調節器設計與分析

Design of Unified Power Conditioner for Dual Loop Power System

隨著分散式發電系統漸獲矚目，其雖將在未來之智慧電網內佔舉足輕重之地位，但分散式發電系統加入配電系統運轉仍有許多系統衝擊問題尚待解決，其中配電系統即常受到電力饋線可允許之承載電流量因素，無法於任意饋線位置皆允許再生能源加入並聯運轉，其可能影響再生能源之廣泛設置。為解決此一問題，不同饋線間之電力轉移即顯得非常重要，因此本文基於現代電力系統在高品質需求之供電地區常採雙迴路配電架構，故提出利用相鄰的兩供電迴路，在兩電力饋線間分別串接換流器，並令其共用直流電壓匯流排，則所提系統除有助於主電力饋線之電壓驟降保護外，電力潮流亦得透過所提系統從副饋線移轉到主饋線迴路，以線間調度方式解決部分輸電線路承載電流量之問題，進而得提高其於電力系統應用之彈性。為評估掌握所提方法的可行性，本文已發展雛形電路，並經由相關電路測試予以驗證理論分析結果確具可行性。相關研究心得與經驗，未來應可提供電力從業人員進行電力品質改善工程時之施行參考。

In recent years, many applications of power technologies have been developed for power power-supplying quality enhancement. Among them, Unified Power Quality Conditioner (UPQC), which consists of double converters connected by a DC capacitor with each other, has great potential because of its high controllability. Therefore in this paper, a new scheme for an UPQC is studied. The proposed UPQC uses the power converters to bridge the adjacent two power feeders. Then, the operation of UPQC is not only operated for keeping the load voltage at constant in either of the two feeders, but also for transferring desired power between the bridged feeders. This method has been tested through simulation studies. Test results help consolidate the feasibility of the approach for the applications considered.