Flexible Multi-state Switch Control Strategy Based on Hybrid System Modeling

Comparing with traditional contact switches, the soft open point (SOP) possesses more functions and faster response speed, so it is one of important device for the realization of power grid flexible interconnection. The existence of the switching element in the SOP made system operation states switched back and forth between continuous system and discrete system, for this reason, it was put forward for SOP to adopt a more suitable hybrid system model to conduct modeling control. Firstly, eight switching modes of each port were analyzed, and then one power frequency cycle was divided into twelve subintervals and through the relation between the system continuous state quantity and each switching mode the switching rule of the switching mode in each subinterval was derived. According to the switching rule the discrete controller was designed, and according to the conversional relation of continuous state quantities each other the continuous controller was designed, and the hybrid controller of each port under different operating modes was comprehensively obtained. Finally, by means of MATLAB/Simulink platform a simulation model was constructed, and through the simulation comparison with traditional modeling control method the effectiveness of the proposed scheme is verified.