中文摘要：

分析了孤立微电网模式下基于平均功率控制的并联逆变器系统均流原理。为了抑制由于并联逆变模块之间参数差异所引起的基波环流,引入虚拟阻抗环;同时,加入直流抑制环以抑制并联模块输出电压之间的直流分量偏差所产生的直流环流。在2台30 k W并联逆变器上验证了所采用的控制策略。试验结果表明,所提出的控制策略能有效地抑制环流,提高均流精度。

英文摘要：

This paper analyzed the control theory based on active power and reactive power, to eliminate the circulation current in the paralleled inverter system under isolated microgrid. Moreover, the virtual impedance loop was introduced to the control system in order to suppress the fundamental circulation current caused by the difference of parameters among the paralleled inverters. Meanwhile, a separate DC suppression loop was added in each paralleled inverter module,which is used to eliminate the DC circulation current in the multi-module paralleled inverter system. The experiment in two sets of 30 kVA three phase paralleled inverter system proves that the proposed control strategy is available and can improve the accuracy of sharing of the load.