Comparison of Active Full Compensation Control Algorithms for Single-phase Grounding Residual Current in Distribution Networks

Abstract

Current method and voltage method are two full compensation arc suppression control algorithms commonly used for single-phase grounding faults in the distribution network. The current method has a good compensation effect under small transition resistance, while the voltage method has a good compensation effect under large transition resistance. The existing research focuses on the control principle and implementation method of the current method and voltage method, but there is less research on the applicable boundary and comparative analysis of the control effect of these two methods. In view of this, this paper deduces the residual current full compensation theory of distribution network single-phase ground fault, introduces the control principles and implementation methods of the current method and voltage method respectively, establishes two evaluation indexes of residual current compensation accuracy and residual current compensation time, and conducts simulation and comparative research on the control effects of the two methods under different transition resistance and fault location. The results show that the dividing range of transition resistance applicable to the two methods is about 250 Ω–500 Ω. Within the dividing range, the compensation effect and control time of the two methods are equivalent. The current method surpasses the voltage method in compensation effect and control time below the dividing range, while the voltage method is superior to the current method in compensation effect and control time above the dividing range.