抽水蓄能电厂发电电动机励磁绕组匝间短路故障仿真分析

Analysis on Inter-Turn Short Circuit of Excitation Winding for Generator-Motor in Pumped-Storage Power Plant

以惠州抽水蓄能电厂发电电动机为例,对励磁绕组匝间短路故障进行数字仿真,得到故障情况下发电机定子和转子电流的波形,通过故障波形的傅里叶分解,得到故障稳态电流各次谐波的大小,并对故障电流各次谐波产生的机理进行了分析。最终得出励磁绕组匝间短路故障下发电机定子和转子电流特征,为抽水蓄能电厂发电电动机组励磁绕组匝间短路的故障检测提供理论依据。

This paper takes the generator-motor of Huizhou Pumped Storage Power Plant as an example.The current waveform of stator and rotor windings during the fault of interturn short circuit of the excitation winding can be derived through numerical simulation.And the harmonics of steady-state fault current from FFT analysis of the current waveform can be obtained as well.Then the mechanism of each harmonic generation of the fault current is analyzed.Finally,the stator and rotor windings current characteristics of interturn short circuit are obtained,and this will provide a theoretical basis for fault detection of inter-turn short circuit of excitation winding in generator-motor of pumped-storage power plant.