Research on Interphase Self-Balancing Based on Cascaded H bridge Energy Storage System

摘要

Large capacity energy storage system is one of the effective measures to solve the problem of grid connection of a series of renewable energy generation power generation like wind power generation. Aiming at the imbalance of battery's SOC (state of charge SOC) in large-capacity energy storage system, we regulate the output power of each phase by injecting zero sequence voltage into cascade H bridge energy storage system and select the amplitude and phase angle of zero sequence voltage reasonably, through this method SOC equalization can be realized by adjusting the additional power of each phase. The system model has been built in the MATLAB simulation environment, and the simulation results verify the effectiveness and feasibility of the control method.