分布式并联逆变器解耦电流下垂控制技术

Decoupling current droop control technique for distributed parallel inverters

针对微电网分布式逆变器下垂控制并联系统,研究了不同容量逆变器并联时的功率流控制。线路阻抗的存在不仅会造成有功功率和无功功率的耦合,还会造成有功功率和无功功率无法按照额定的容量分配。本文在分析传统下垂控制原理以及解耦控制的基础上,提出了一种新型下垂控制方法。该方法不仅能实现有功功率和无功功率的解耦,而且能进一步实现有功功率和无功功率的精确控制。该方法可以消除线路阻抗对功率分配的影响。仿真和实验结果验证了提出方法的有效性。

Considering the droop-controlled parallel-connected inverters in microgrid, the power flow control of the parallel inverters with different rated powers is investigated.The existence of the line impedance results in not only the coupling of the active and reac-tive power, but also the active and reactive power sharing problem. Firstly, the conventional power droop control and power decou-pling control are discussed.And then a new droop control method is proposed in this paper.It can achieve both the power decoupling and accurate control of the active and reactive power.The effect of the line impedance on the power sharing can be significantly e-liminated by using this method.Finally, the simulations and experimental results verify the effectiveness of the proposed method.