The traditional single closed-loop voltage control is unable to effectively control inverter without support of grid voltage and frequency when micro grid system is in island operation mode.However adding a current inner-loop in it,a voltage synchronization control is used to effectively control AC bus voltage and frequency for reduction of inverter output current impact on grid.Capacitive current feed-forward decoupling is introduced to ensure the inverter output power tracing different load power in time,and improve stability of the system with inductive load.Simulation analysis shows that the proposed strategy is able to accurately control voltage and frequency of AC bus,and has batter dynamic response on different loads,which verifies the effectiveness and correct of the proposed control strategy.%微网系统孤岛运行时,失去电网电压和频率的支撑,传统的单闭环电压控制已经无法满足对逆变器的有效控制.文章在传统单闭环电压控制的基础上,加入电流内环,采用电压预同步控制,对交流母线电压和频率有效控制,减小逆变器输出电流对电网的冲击.引入电容电流前馈解耦,保证逆变器输出功率实时满足不同负载的功率变化,提高了系统带感性负载时的稳定性.通过仿真分析,该控制策略实现了交流侧母线电压和频率的稳定,且系统带不同负载时,逆变器具有较好的动态响应性能,验证了该控制策略的有效性和正确性.
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