In order to solve the problem that the way of resonant grounding can not be adopted to realize the compensation of the transient process

a transient response optimization method based on flexible grounding was proposed by analyzing the transient process. When single-phase grounding fault occurs

the compensation current of active and reactive components is injected into the neutral point of distribution network by inverter to optimize the transient response. Theoretical analysis and simulation results show that the active component of compensation current can accelerate the attenuation of transient process and restrain the amplitude of transient overvoltage; the reactive current component is used to compensate the transient current of arc-suppression coil. The optimization method can be adopted to reduce the probability of establishing arc and the possibility from instantaneous fault to permanent fault or rapidly extinguish arc. Therefore

the optimization method can be adopted to achieve flexible arc suppression and reliable self-healing during transient period of single-phase grounding fault and to improve the operation reliability of distribution network.