Identification of Voltage Notching Source in Distribution Network

Commutation of a semiconductor power converter connected to distribution network triggers a notching oscillation current in the high frequency region due to system resonance. While the high frequency oscillation causes the power-factor improvement capacitor to produce noise, it is difficult to locate the oscillation source by conventional measurement. We have developed methods for locating the oscillation source and evaluating the extent of the problem by simulating an LC equivalence circuit for the distribution network. This is achieved by utilizing a transfer function and impulse response calculation techniques based on the state-space method.