弱电网下双馈感应发电机定子匝间短路故障时电网电压稳态分析

Voltage Steady State Analysis of Double-Fed Induction Generator with Stator Winding Inter-Turn Short Circuit Fault Connected to a Weak Network

深入研究了发生定子绕组匝间短路故障的双馈感应电机(DFIG)接入交流弱电网后,给公共连接点(PCC)处电压带来的影响及其功率约束。首先建立了含故障风机的弱电网模型,然后利用这一简化的系统模型进行了影响PCC处电压稳定性因素,风机输出有功功率以及无功功率问题的研究。最后通过MATLAB/Simulink仿真平台对结果进行验证,结果表明:双馈风机发生定子匝间短路故障后,DFIG输出有功功率减小无功功率增加,进而对PCC处电压稳定性产生一定的影响,并且随着风机故障程度、线路阻抗比以及电网强度的改变,PCC处电压波动越显著。

Thoroughly investigates the voltage variations at the point of common coupling, PCC, and power constraints of a double-fed induction generator, DFIG, with stator winding inter-turn short circuit （ SWITSC ） , fault into a weak network. Firstly, a weak network model with fauh DFIG was established, and then, the factor which influenced the PCC voltage steady state and the active power and reactive power of the DFIG were discussed by the simplified system model. Finally, results verification was performed via the MATLAB/Simulink simulation platform, The results showed that the active power decreased and the reactive power increased while the DFIG arised SWITSC fault, which, to a certain extent, impacted the PCC steady-state voltage. Also, it could be seen that the PCC voltage varied dramatically with the fault level of DFIG, the feeder X/R and the system strength.