Compensation of ground fault capacitive current in ungrounded distribution networks by static semiconductor converter

Abstract

In this paper a new approach of ground fault capacitive current compensation in ungrounded distribution networks is proposed. According to proposed method in parallel with network phases a static semiconductor converter is connected. In the ground fault mode the converter must generate the current of zero sequence in opposition with capacitive short circuit current. In this paper the electromagnetic processes taking place in the network in a short circuit mode are considered, and also the possibility of ground fault capacitive current compensation in the short circuit mode by static converter is shown. The converter simulation results with Matlab Simulink in the short circuit mode are presented.