本論文旨在研究市電並聯型感應發電機應用於沼氣發電系統之特性，文中的發電機轉軸加入了沼氣引擎及調速機之數學模型作為發電機之轉速控制系統。本文中分別使用了市電併聯型感應發電機之qd0與abc模型以探討三相平衡與三相不平衡情況下之感應機、自激電容器與市電匯流排端故障及參數變動之動態特性。在穩態分析方面，則針對感應機之兩種工作模式與市電匯流排端電壓改變之情況來做一詳細研究。由系統實際量測值與模擬結果之對照，可知本系統所推導之模型與感應機之內部參數獲得是可行的。最後，則將單機系統擴展至雙機系統來做上述相關之分析。

This thesis investigates the performance of grid-connected induction generators (GCIGs) of a biogas generation system. The biogas engine and governor models are employed to simulate the speed control system of GCIGs. The induction machine’s qd0 and abc models are respectively employed to study the system under three-phase balanced and unbalanced conditions. The characteristics of the induction machine, capacitor, and utility grid bus under faulted conditions and parameter variations are clearly examined. Two operating modes of GCIGs and the variation of the utility grid voltage under steady-state conditions are explored. Both field measured results and simulated results are compared to validate the feasibility of the proposed system model and machine parameters. Finally, characteristics of two GCIGs connected to the same utility grid are also investigated.

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