Switch process analysis for supply restoration using a novel hybrid soft open point

The hybrid soft open point(HSOP) adopts the structure of mechanical switch and soft open point(SOP) in parallel, which can reduce the capacity of the converter. It’s commonly used for power flow control and load transfer between two distribution networks. However, when one end of the distribution network loses power, the operation delay of the mechanical switch will cause the load power failure during the load transfer. In view of this, a novel HSOP consisting of back-to-back voltage source converters(BTB-VSC), a mechanical switch, and an anti-parallel thyristor is proposed. The proposed HSOP can avoid the load power failure caused by the mechanical switch operation delay compared to the traditional HSOP, and its feasibility is verified by simulation.