Abstract
Energy Storage Systems (ESS) are vital to improving the reliability of an islanded Micro-grid (MG). In this paper, a distributed control strategy integrated with multi-agent-based average consensus algorithm is presented for the Distributed Energy Storage Systems (DESS) in islanded AC micro-grid. A hierarchical control structure is implemented that consists of three control levels, i.e.: inner controls, primary controls, and secondary controls. The secondary control layer consists of estimators for injected power, SoC, and system frequency. Power sharing is achieved with SoC based adaptive droop control. The multi-agent based average consensus algorithm is implemented to obtain average estimate of SoC, frequency and active power. A voltage compensation method is given to ensure that the voltage of PCC is within the acceptable range. The simulation studies carried out, verify that the proposed control strategy can ensure accurate power sharing among DESS and restore voltage and frequency to a nominal accepted range.
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