A Survey of Control Stratedy Based on Cascaded H-bridge Power Conversion System

The fluctuation and intermittence of renewable energy sources power poses a great challenge to the stable operation of power system, which needs power conversion system(PCS) to provide spare power to achieve dynamic balance of supply and demand for the power grid. Cascaded H-bridge converter is a main topology structure for the application for high voltage large capacity grid, which is combined with different energy storage media, having broad application space in the large capacity storage places. This paper introduces the topology of cascaded H-bridge PCS, expounds the various control strategies under different energy storage media and mainly analyzes and evaluates the various control methods, whose respective advantages and disadvantages are also summarized, providing reference for the theory research and practical application.