电网不平衡工况下链式储能变流器SOC均衡控制方法研究OA

Under grid voltage unbalance conditions,active power deviations occur between the three phases of the cascaded energy storage converter,leading to unbalanced three-phase state of charge(SOC)and ultimately reducing capacity utilization and system reliability.To address this issue,a control strategy based on the hybrid injection of negative-sequence current and zero-sequence voltage was proposed.When zero-sequence voltage injection alone cannot achieve SOC balance,the remaining power deviation was balanced through negative-sequence current injection.This approach avoids the issue of excessive zero-sequence voltage injection causing output voltage distortion,and compares to using negative-sequence current injection alone,it also reduces the negative-sequence current flowing into the grid.This control strategy balances both phase-to-phase SOC balancing capability and the output power quality of the converter.Finally,the effectiveness of this approach was verified through simulation.