Adaptive Active Grounding Fault Regulation Method Considering the Influence of Line Impedance in Distribution Network

Abstract

The problem of grounding fault arc suppression is the key to the safe operation of distribution network, but the existing voltage and current arc suppression methods are difficult to effectively deal with different grounding faults. This paper proposes an adaptive grounding fault regulation method considering the influence of line impedance. Firstly, the variation of residual voltage and residual current with grounding resistance and fault distance is deduced, and the mechanism of voltage arc suppression affected by line impedance is verified. Secondly, the difference of line characteristic parameters between complete arc suppression and incomplete arc suppression in distribution network is compared. Further, the deviation between load current and line current of fault phase is converted into residual voltage compensation of fault point, then the influence of the line impedance voltage drop on the arc suppression can be offset. This method can adapt to the different grounding fault condition and accurately suppress the voltage of fault point to zero. The analysis of the transfer function and Bode diagram of the control system proves that the control method has strong stability and adaptability to line parameter changes. Finally, the reliability and feasibility of the proposed arc suppression control strategy are verified by MATLAB/Simulink simulation.