基于自适应阻抗二次控制的直流微电网优化配置研究

摘要

Aiming at the shortcomings of the current droop control,an adaptive impedance quadratic control method is designed in this paper.The distributed control scheme is used to adjust the sagging coefficient through the average current and the average sagging coefficient adjuster.At the same time,even when the impedance of the external cable of the converter is not matched,the matching conditions can still ensure that the characteristic impedance is equal.In addition,an equivalent circuit analysis is carried out with two parallel converters of the same capacity.The experimental platform of dropping control of DC microgrid is built to experiment the method.The results show that the adaptive impedance secondary control method has good dynamic current sharing performance and can cope with the complex changes of the load in the DC microgrid.%针对目前直流下垂控制的缺陷,设计了自适应阻抗二次控制方法,运用分布式控制方案,经过平均电流及平均下垂系数调节器完成对下垂系数的协调调整,可在变换器外接线缆阻抗不匹配的状况下确保其特性阻抗相等.以两台容量相同的并联变换器为例进行了等效电路分析.构建直流微电网下垂控制实验平台,对该方法进行实验,结果表明自适应阻抗二次控制方法拥有很好的动态均流性能,能够应对直流微电网中负载的复杂变化.