Abstract: A large number of voltage fluctuations will occur in the grounding process of optical storage DC

microgrid，which has a bad impact on the stability of microgrid power signal. Due to the poor voltage disturbance

signal capture ability of the present optical storage DC microgrid grounding anti-interference technology，it is

unable to complete the signal anti-interference processing under different voltage disturbances. Therefore，the

optical storage DC microgrid grounding anti-interference technology under different voltage disturbances was

designed. Firstly，the optical storage DC microgrid model was constructed，then the grid connected converter

microgrid equipment used in grounding was determined，and the current change in the grounding process was

analyzed. The particle swarm optimization algorithm was used to design the voltage disturbance signal detection

algorithm. Finally，according to the signal detection results，the microgrid grounding mode was set as the hybrid

grounding mode to process the interference signal in the microgrid AC circuit. The simulation results show that the

proposed grounding anti-interference technology of optical storage DC microgrid under different voltage

disturbances can effectively eliminate the interference signals and ensure the stability of power grid signal output

under various voltage disturbances.

      Key words: voltage interference；anti-interference technology；microgrid model；grid connected converter；

optical storage DC microgrid；grounding signal