Coordination control strategy for three‐port SNOP based on FCS‐MPC

Abstract

As a new type of power electronic device, Soft Normally Open Point (SNOP) can replace the traditional tie switch in distribution network to realise uninterrupted flexible regulation of power flow and optimise voltage profile. Several possible joining topologies and working modes of the three-port SNOP in the distribution network is discussed here. For the back-to-back three-port SNOP topology, a three-port SNOP coordination control strategy based on Finite-Control-Set Model-Predictive Control (FCS-MPC) is proposed, which has many advantages of clear principle, simple implementation, and fast dynamic response. The dynamic mathematical model of three-port SNOP is established, and the working mode set is proposed. Based on FCS-MPC, the control algorithms of UdcQ mode, PQ mode, and CVCf mode are implemented. Accordingly, coordination control strategy between the modes of three ports is presented. In order to verify the feasibility of the proposed scheme, a three-port back-to-back SNOP simulation model was built using Matlab/Simulink. The simulation results show that the proposed coordination control strategy can effectively achieve multi-port coordinated control which can provide a flexible solution for applications of multi-port SNOP.