Abstract
This paper presents a decentralized operation of DC microgrid comprising photovoltaic system (PV) along with parallel connected battery energy storages. The adaptive state of charge (SoC) based dc power droop is proposed for load sharing among multiple battery energy storage systems (BES). The proposed SoC adaptive droop not only ensures decentralized load sharing but also ensures optimum utilization of battery power and its charging/discharging rates which depends on its present SoC status. Also, integral sliding mode control (SMC) based robust inner current controller for bidirectional de-de converter of BES is presented to track the current references with zero steady state error and with reduced effect of load disturbances. The simulation results present the operation of adaptive SoC droop controlled DC microgrid under load dominating and generation dominating modes with reduced steady state error due to SM C based current controller and improved BES charze/discharae profile.
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