Research on Key Technologies of SNOP Suitable for Distribution Network

To ensure power quality and power supply reliability, the architecture and mode of the power distribution system are undergoing major changes. In order to further solve these problems and ensure the power quality and power supply reliability of the distribution network, active distribution network technology and various distribution network-oriented power electronic equipment have attracted the attention of scholars from all over the world. Among them, SNOP has gradually become a field of distribution network. New research hotspots. In recent years, scholars in the world have begun to pay close attention to the impact of SNOP on the distribution network and its application of key technologies. SNOP is a new type of flexible primary equipment that can replace traditional tie switches at several key nodes in the distribution network. Compared with the traditional tandem switch, it not only has two states of on and off, but also has no limitation of the number of actions of traditional mechanical switches. It increases the continuous controllable state of power, and has the characteristics of flexible switching of operating modes and flexible and diverse control methods. With the gradual maturity of operation control technology, SNOP’s continuous power adjustment ability has become more prominent and no longer has the obvious “normally open” feature, so it is more called SOP (soft open point) in subsequent research. SOP technology aims to replace traditional circuit breaker-based feeder tie switches with controllable power electronic converters, thereby realizing normalized flexible “soft connections” between feeders, and can provide flexible, fast and accurate power exchange control and power flow optimization capabilities. At present, the research on SNOP at home and abroad has just started, and the problems related to SNOP’s device research and development, control technology, and system access need to be solved urgently.