基于一致性算法的直流微电网储能系统功率分配技术

以直流微电网中的分布式储能系统为研究对象,分析了储能单元间存在的功能、参数和信息的不对称性,并提出了混合储能单元多工作模式下最大输出功率及等效荷电状态(SOC)的评估方法。在此基础上,提出了一种基于离散一致性算法的分布式储能系统负荷功率分配分层控制策略:在下层,以储能单元多模式参数评估为依据,使用动态下垂控制对各储能单元输出功率进行一次分配;在上层,以减小分布式储能系统等效SOC差异为目标,利用相邻单元之间的的弱通信,使用离散一致性算法产生电流修正量,直接调节下垂控制电流参考值,动态调整处于不对称工作状态的各混合储能单元的输出功率。最后,在MATLAB/Simulink中建立了仿真模型,对所提控制策略进行了仿真验证。

Consensus Algorithm Based Power Distribution Technology for Energy Storage System in DC Microgrid

By studying on the distributed energy storage system in DC microgrid, the asymmetrical characteristics in performance, parameters and information between the energy storage units are analyzed. Consequently, the maximum output power and the equivalent state of charge (SOC) evaluation methods for the hybrid energy storage units considering the multiple operation modes are proposed. On this basis, a hierarchical control strategy for load power distribution of distributed energy storage system is proposed based on the discrete consensus algorithm, which includes two layers. In the lower layer, based on multi-mode parameter evaluation of energy storage unit, the dynamic droop control is used to allocate the output power of each energy storage unit. In the upper layer, with the purpose of reducing the difference of equivalent SOC of distributed energy storage system and using the weak communication between adjacent units, the current correction signals are generated by discrete consensus algorithm to directly adjust the droop control current reference value and dynamically adjust the output power of each hybrid energy storage unit in an asymmetric working state. Finally, a simulation model is built in MATLAB/Simulink to verify the proposed control strategy.