Distributed cooperative control of energy storage units in microgrid based on multi-agent consensus method

Abstract For a grid-connected microgrid, volatile renewable resources and undulating loads lead to the active power fluctuation at the point of common coupling (PCC), which brings extra regulation burden to the main power system. This paper proposes a distributed cooperative control method to regulate the charging/discharging behavior of multiple energy storage units (ESUs) to restrain the active power fluctuation at the PCC. With the proposed method, all the ESUs operate in the same state of charge (SoC) and ratio of power (RoP), and thus the uneven degradation of ESUs is avoided. Under the distributed control architecture, the network resource can be saved since the control center just communicates with parts of ESUs. The simulations are performed on a typical microgrid, and the effectiveness of the proposed method is validated by numerous results.

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