81 / 2020-09-25 16:43:28

Coordinated Power Control of Hybrid AC/DC Microgrid Based on Battery‘s State of Charge

coordinated control strategy, hybrid AC/DC microgrid, interlinked converter (ILC), Photovoltaic array, state of charge (SOC)

Photovoltaic array (PV) has the characteristics of strong intermittent and random output, and is often equipped with battery. In this paper, a coordinated control strategy based on the battery's state of charge (SOC) and system operation mode is proposed. When connected to the grid, the stability of the DC bus is maintained according to battery's SOC by coordinating the battery and the interlinked converter (ILC); when in islanded mode, the differential of SOC is used to adjust the output power of PV to respond to power fluctuations together with battery. Besides, the ILC control strategy is switched according to the SOC of battery in AC and DC side. Besides, the only way is to reduce the active power generated or cut off some secondary loads in order to keep system stable when the batteries exit one after another. Finally, simulation tests are conducted to verify effectiveness of the proposed strategy.