电容器投切扰动源的交叉不完全S变换定位方法

摘要

提出了一种基于交叉不完全S变换的电容器投切扰动源定位的新方法.定位方法首先利用扰动电压信号功率谱包络的动态测度确定扰动频率,并针对该频率求瞬时电压和电流信号的不完全S变,求得相应的扰动频率向量,接着对两向量作交叉S变换,得到扰动频率向量的交叉相位谱,然后从该相位谱中提取对应于扰动起始时刻的值,即得到瞬时电压和电流信号扰动频率分量的相位差,最后根据其极性判断扰动源相对于监测点的位置.仿真结果验证了该方法的有效性.%This paper proposes a new method for locating capacitor switching disturbance source using cross incomplete S-transform. The envelope Dynamics of power spectrum are used to determine the disturbance frequency. The disturbance frequency vectors of S-transform of transient voltage and current, which are obtained by performing incomplete S-transform, are employed to perform cross S-transform and the phase spectrum is obtained. The phase difference of transient voltage and current is determined by extracting the value at disturbance start point. The location relative to monitoring stations of switching capacitor is determined by the polarity of the value. The effectiveness of the proposed method has been verified by simulation experiments.