Post-Fault Restoration After Short-Circuit Fault for Serial-Shunt Multiport Soft Normally Open Points

Soft normally-open points (SNOP) can flexibly adjust the power flow between different feeders with power electronic technology. Nowadays, SNOP generally adopts the BTB-VSC topology with bulky size and high initial cost, which is not conducive to promotion and application. To compensate the limitations, a series-shunt multiport SNOP topology was proposed, offers superior power density, reduced weight, and enhanced flexibility for further expansion. Nevertheless, in the event of a short-circuit fault affecting one of the feeders, the remaining healthy feeders will also be subjected to the fault current, thereby threatening the safety of both the S2-MSNOP's devices and feeders. This paper proposes a post-fault restoration scheme for a distribution network system equipped with S2-MSNOP. The scheme ensures the reliable isolation of the faulty feeder and the restoration of the healthy feeders' operation. This paper discusses the configuration and implementation of the scheme. The simulation results provide verification of the effectiveness of the proposed protection scheme.