Recovery Strategy of Pole-to-Pole Short-Circuit Fault with Backup Automatic Switch in DC Distribution Network

Abstract

Aiming at the DC distribution network failure, combined with the two-supply and one-backup topology, a strategy for recovering pole-to-pole short-circuit faults in DC distribution network with backup automatic switch (BAS) is proposed. By changing the logic of BAS operation, the influence of distributed generation (DG) on BAS is eliminated. Considering the wide use of DC circuit breakers, a fault recovery strategy based on DC circuit breaker and BAS is proposed. This strategy uses a DC circuit breaker to cut off transient faults, and when the permanent faults occur, it uses BAS to restore the power supply in the non-fault isolation area. The faults at different locations of the DC line are partitioned to ensure the stability of the power supply to the load terminal. In order to verify the feasibility of the scheme, a two-supply and one-backup DC distribution network model is established through MATLAB / Simulink. Simulation results proved the effectiveness of the proposed method.