正交小波在发电机定子单相接地保护中的应用

摘要

A new stator grounded fault protection scheme based on wavelettransform is presented in this paper. With the comparison of the polarity of local maxima of the 3rd harmonic zero sequence voltages between the generator neutral and terminals, the new approach can find the grounded fault sensibly. Simulation results show that the scheme can obtain the high sensitivity which the huge generator requires during all operating conditions.%提出了基于正交小波的发电机定子单相接地保护新方法，即利用经小波变换后机端和中性点侧三次谐波电压的局部模极大值符号特性是否相同来识别定子接地故障。仿真结果表明，该方案在各种运行方式下均能取得很高的灵敏度，满足现代大型发电机组继电保护的要求。