直流微电网群分层控制策略

摘要

A hierarchical control strategy is proposed in this paper for the stable operation of DC microgrid clusters.Un-der the primary control,all the sub-microgrids operate independently and stably,the distributed generations(DGs)are under the maximum power point tracking(MPPT)control,and the allocation of load power is dynamically adjusted by the storage system to realize a state-of-charge(SOC)balance among storage units.Under the secondary control,seam-less switches among different operation modes of microgrid clusters are controlled according to the bus voltage in each sub-microgrid,and the bus voltage quality is improved through managing the power flow among sub-microgrids.Final-ly,a microgrid clusters simulation model is built in Matlab/Simulink,and simulation results indicate that the proposed control strategy can improve the stability of microgrid clusters and the voltage quality of power supply.%为了确保直流微电网群可靠运行,提出一种分层控制策略.在第1层控制下,各子微网独立稳定运行,分布式电源均采用最大功率跟踪控制,储能系统通过动态调整负荷功率的分配来均衡储能单元的荷电状态.第2层控制根据各子微网的母线电压控制微电网群在不同运行状态之间无缝平滑切换,并通过管理不同子微网之间的功率流动来改善母线电压质量.最后利用Matlab/Simulink搭建微电网群仿真模型,仿真结果表明该控制策略可以提高微电网群的稳定性并可改善供电电压质量.