Control strategy of dual H-bridge power flow controller for DC grids

Working principle of dual H-bridge power flow controller for DC grids is analyzed, the relationship between controlled current, capacitance location and capacitance current is explained and the switch controllers are designed with status comparison method. After that, a DC grid is constructed based on Zhoushan multi-terminal HVDC system, the grid is modeled and studied with PSCAD/EMTDC, and the response curves of current, capacitance voltage and switch frequency are analyzed. The results verify the correctness and effectiveness of the proposed control method.