Abstract
When the Photovoltaic-Battery Energy Storage System(PV-BESS) systems virtual synchronous generator(VSG) is in normal operation, its output power tracks the dispatch command value, where the PV adopts the maximum power tracking method, and the deviation between the PV output power and the virtual synchronous machine power command is eliminated by energy storage, which stabilises the DC bus voltage and suppresses the overall output power fluctuation of the PV-BESS systems. As energy storage has different characteristics at different charging and discharging depths, its battery life and performance will receive a significant impact when it is in an over-charge or over-discharge state. To address these issues, a grid-connected PV-BESS systems virtual synchronous generator control method is proposed that takes into account the charging and discharging depth of BESS. The inverter, PV and storage are coordinated and controlled according to the storage charge state.
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