Compensation of the high-frequency ground fault current components in medium voltage grids

A single-phase ground fault is one of the most frequent faults in distribution grids. Despite the ability of the continuous operation with a sustained fault, the ground fault current has to be compensated until it would be cleared or self-cleared. In addition the ground fault introduces a high frequency distortion to a grid. This work proposes a control algorithm for an active ground fault current compensator. The algorithm allows not only eliminating the main component of the ground fault current, but high-frequency components. The concepts of compensation values determination, control structures and simulation results are presented.