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With the incursion of renewable energy into the power generation system, the demand for Energy storage system (ESS) becomes significant. Hence, parallel operation of Battery Energy Storage Systems (BESS) is an important application in microgrids. The quasi-Z-source inverter (qZSI) with BESS can poise the random wavering of power from renewable sources injected to the load or grid. The qZSI is a single stage converter with two controllable DC ports. The batteries connected in the two DC ports of qZSI are charged by hybrid renewable energy resources such as solar and wind energy. Due to the volatile nature of renewable sources, the batteries may be supplied with unequal voltage and current ratings. These BESS with different voltage and power rating supplies the load, hence a proper control strategy is required to accomplish the current sharing between these batteries. The proposed control strategy is investigated in both islanded mode and grid connected mode. Also the maximum power point tracking (MPPT) methods are used to harvest maximum power from solar and wind energy systems. This will ensure maximum conversion efficiency.

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