Tracking capacitor switching disturbance source using cross incomplete S-transform

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.