基于有功功率修正的MMC串联结构微电网相间功率平衡控制策略OACSTPCD

A phase to phase power balance control strategy based on APC is studied for the phase to phase power imbalance and operational instability caused by the microsource output power fluctuation in the MMC series structure microgrid system under islanded unbalanced load.Based on the system islanding mode equivalent circuit,the system output power is modeled mathematical-ly and the inter-phase power flow pattern is analyzed.On the premise of symmetrical three-phase output voltage,the power to be corrected is determined according to the micro-source power and load power,and a circulating current controller is designed to achieve inter-phase power mutualization using control of the DC circulating current.The strategy has been proven to enable adaptive dynamic adjustment of the three-phase power and eventually make the power balance between phases.