Decoupled Feedback Linearization Control for SOP

Soft Open Point (SOP) is a new power electronic device installed in place of traditional tie switch in a distribution network. It can realize flexible, fast and reliable regulation of feeder flow, improve voltage distribution level and the ability of distribution network to consume distributed generation. This paper analyzes the topology of three-port SOP and establishes the mathematical model of SOP. According to strong coupling and nonlinearity of the model in the dq reference frame, decoupled feedback linearization control is proposed to linearize the system and realize decoupling control of active current and reactive current. Then linearization method is used to design controller for the linear system. A three-port SOP system is designed based on the MATLAB/Simulink simulation software, and simulation results show that the control strategy proposed in this paper is feasible and can provide new ideas and solutions for the application of SOP in the distribution network.