提升PMU动态测量性能的若干方法

Methods for improvement of dynamic performance of PMU

为了提高PMU装置在电力系统动态条件下的同步相量测量精度,研究了若干提升PMU装置动态测量性能的方法。采用IEEE C37.118标准中推荐的基于离散傅里叶变换(DFT)的同步相量计算模型,对基于DFT的相量测量算法进行了改进。分析了该改进方法在带外干扰、系统振荡、系统失步、短路或断线故障等动态条件下的特性。设计了等纹波滤波器对相量数据进行滤波处理,保证同步相量的测量精度,最后在PMU装置中实现并进行了测试验证。实验结果表明,通过上述方法的实施,PMU在动态条件下的测量精度得到了提高。

For improving the synchronized phasor measuring accuracy ofphasor measurement unit （PMU） in condition of power system dynamic transition, methods for improving PMU＇s dynamic performance are researched. Phasor estimation model recommended in IEEE C37.118 which is based on Discrete Fourier Transformation （DFT） algorithm is used. Phasor measurement method based on DFT is improved and its characteristic is analyzed under out-of-band interference, oscillation, out-of-step, and short-circuit fault conditions. Equiripple filter is designed to process phasor data for ensuring synchronized phasor measuring accuracy. Finally, methods are realized in PMU and the test is carried out to verify the methods used. Synchrophasor measurement accuracy under dynamic processes is improved with the methods applied.