多储能独立直流微电网自适应分级协调控制

Adaptive Hierarchical Coordinated Control of Multi-energy Storage in Isolated DC Microgrid

针对孤立直流微电网多储能单元之间荷电状态均衡问题,提出一种自适应分级协调控制策略。通过功率分配级控制,使得各储能单元之间功率按照各自荷电状态（state of charge,SOC）进行分配,并根据本地储能单元的功率变化确定储能系统的主导储能单元。进而通过功率平衡级控制,即采用模糊控制算法调节下垂控制的虚拟电阻,使得各个储能单元在与主导储能单元功率达到平衡的同时SOC也达到均衡,从而避免部分储能设备因过度放电或深度充电退出工作,并且储能单元之间的协调控制无需通信。最后利用RTDS进行实验分析,验证所提控制策略不仅能使多储能之间快速达到荷电平衡状态,并且有效的减小母线电压偏差。

A hierarchical control strategy based on adaptive coordination was proposed for equilibrium problem of the state of charge in the isolated DC microgrid with distributed energy storage units. The power of each energy storage unit is distributed according to the respective state of charge （SOC） by the stage of power distribution control. According to the change of the power in the local energy storage unit, the control strategy can calculated the leader energy storage unit in the energy storage system. Then, the fuzzy controller in the stage of power balance control was used to adjust the virtual resistance, so that energy storage units to achieve power balance with the main energy storage unit, also reached the equilibrium of SOC, which avoiding the part of energy storage equipment out of work due to excessive discharge or depth charge. In addition, the control of energy storage units needs no communication. And the results of RTDS proved that the proposed control strategy can not only reach the equilibrium of SOC between the energy storage units rapidly, but reduce the voltage deviation caused on the common DC bus effectively.