基于多回路理论的双馈异步发电机定子绕组匝间短路故障分析

Analysis of Stator Winding Inter Turn Short Circuit Fault in Doubly Fed Induction Generator Based on Multi Loop Theory

鉴于定子负序电流不能准确检测电源不对称情况下双馈异步发电机定子绕组匝间短路故障,分析了负序视在阻抗法在电源不对称情况下检测双馈异步发电机发生定子绕组匝间短路故障的可行性。基于多回路理论,建立了电源对称及不对称情况时双馈异步发电机定子绕组正常及匝间短路情况下的数学模型。对仿真结果进行分析,得出定子负序电流可准确检测电源对称情况下双馈机定子绕组发生匝间短路情况,但当电源不对称时易导致误判;相比定子负序电流,定子负序视在阻抗可应用于检测电源不对称情况下定子绕组发生匝间短路故障的情况。

In view of the negative sequence current stator cannot detect the power asymmetry double-fed asynchronous generator stator winding inter-turn short circuit fault, the negative sequence apparent impedance in power asymmetry detect double-fed asynchronous generator stator winding inter-turn short circuit fault of feasibility was analyzed. Based on multi loop theory, the power symmetric and asymmetric double-fed asynchronous generator stator winding in case of normal and mathematical model of turn to turn short circuit were established. Processing the simulation results and analysis it could be concluded that negative sequence current of the stator could accurately detect the power condition of the doubly-fed stator winding inter-turn short circuit, but when the power asymmetry could easily lead to miscarriage. Compared to the stator by negative-sequence current, negative sequence apparent impedance of the stator could be applied to test the power asymmetry stator winding inter-turn fault condition occurs.