Abstract
The significance of an energy storage system (ESS) in the reliable operation of a DC microgrid (MG) cannot be ignored. This article proposes a novel layered coordinated control scheme to realize fast and precise State of Charge (SoC) based power distribution as well as reasonable bus voltage regulation of ESS in DC MG. To relieve the burden of communication, an inter-neighbor communication network based on multi-agent system (MAS) is built in the communication layer. Meanwhile, the dynamic SoC equilibrium and precise power distribution are achieved in the SoC-based load distribution (SLPD) layer by constructing the adaptive droop controller and the consensus iteration of the unit virtual voltage drop. An improved distributed control scheme is devised in the bus voltage regulation (BVR) layer to compensate for the bus voltage drop generated by droop control. Besides, the system-level energy flow is regulated by dynamically switching operation modes of photovoltaic (PV) and load to keep SoCs within a safe range. Furthermore, after reasonably simplifying the system, the system is subjected to a large signal stability (LSS) analysis based on the mixed potential theory (MPT), and the adequate condition for system stabilization under large disturbances is inferred, offering recommendations for system design. Finally, the Matlab/Simulink simulation and StarSim HIL experimental results conclusively demonstrate that the proposed control scheme expeditiously achieves corresponding control objectives across diverse and complex operating conditions. More importantly, comparative analysis reveals that the proposed scheme exhibits notably better performance when compared to existing previous methodologies.
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