當風力發電機組與配電系統併聯運轉時，配電系統因某種原因突然跳脫，並且使得發電機形成「孤島運轉」而繼續提供電力至仍然連接之負載，這些負載包含跳脫之前自配電系統供電的負載。這個「孤島運轉」將嚴重威脅配電系統維修人員及設備的安全，以及衝擊配電系統的運轉、保護與電壓管理等問題，因此，有必要予以快速偵測並加以排除之。近年來，隨著風力發電機組的快速成長以及絕大多數的機組都是與配電系統併聯運轉的情況下，防止風力發電機單獨運轉的保護措施已成為一個重要的課題。
本研究使用Matlab-Simpower及PSS/E兩種不同套裝軟體，分別用作模擬傳統感應發電機（鼠籠式或繞線式）模型及雙饋感應發電機模型，同時選擇台電公司二次變電所作為模擬架構，在各種不同的負載變化情形下進行模擬，模擬結果顯示兩種發電機發生孤島運轉的機率都是微乎其微。

Whenever a wind turbine generator (WTG) is operating in parallel with a distribution network and the network is suddenly disconnected, the generator becomes an “Island” and is left to supply all of the remaining connected loads, including the share of loads previously supplied by the network. These Islands pose a significant risk to safety of maintenance personnel and equipment, and have negative impacts to the operation, protection and management of the distribution system. Hence this condition should be quickly detected and resolved. In view of the recent rapid increase in the growth of WTG units and since most of these are connected to the network, measures to protect against Islanding operations have become an important issue.
Two sets of softwares, namely Matlab-Simpower and PSS/E, were used in this study to simulate tranditional induction generator (cage or wound) and Doubly-Fed induction generator (DFIG) respectively. In addition, simulation modle is set up based on the scheme of Taipower secondary substation and its simulation was performed under different level of loading conditions. Result indicates that the possibility of formation of islanding for both type generators is rarely.

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