适用于直流分布式储能系统的控制策略

A control strategy for the distributed energy storage system for a DC distribution power network

直流配电系统中分布式储能系统采用电压型下垂控制策略时,分布式储能各个单元之间耦合程度很高,易受线路阻抗的影响,均流效果较差。针对电压型下垂控制策略的不足,本工作提出一种电流型下垂控制策略,分析了关键控制参数的计算方法,实现了分布式储能系统各单元之间线路阻抗解耦。最后,基于理论分析,以储能变换器采用Buck/Boost双向变换器为例,搭建仿真和实验平台,对所提控制策略进行实验验证,实验结果表明,新型电流型下垂控制策略相较于传统电压下垂控制算法具有更好的功率分配效果。

When the voltage type droop control strategy is adopted in a distributed energy storage system for a DC distribution network, the degree of coupling between all the distributed energy storage units becomes very high, which is easily affected by the impedance of the line, and hence poor effect of current sharing. This paper proposes a current type droop control strategy, analyses the calculation method of key control parameters, and the decoupling of the line impedance between all the units of the distributed energy storage system. The experimental results verify the effectiveness of the proposed control strategy.