A control strategy to enhance the life time of the battery in a stand-alone PV system with DC loads

This study proposes a unique control strategy to enhance the life time of the battery in a stand-alone photovoltaic (PV) system employing energy storage devices such as battery and super capacitor. The intermittent fluctuations in PV power and load power affect the DC bus voltage leading to a random and frequent charging/discharging profile of the battery since the controlling converters are operated as constant voltage sources. To overcome this drawback, the supercapacitor converter is commanded as a constant voltage source so as to adapt to varying load conditions and the battery converter is commanded as a constant current source. This strategy helps to decouple the power imbalances from the charge–discharge profile of battery, thereby contributing to the improved battery life. The detailed experimental results are presented. Further, the proposed control strategy is tested and validated under various scenarios.

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