Experimental verification of dynamic voltage restorer fed by solar PV: lithium-ion battery storage for lasting power quality improvement

This paper proposes a novel integration of solar PV and lithium-ion battery-based dynamic voltage restorer (DVR) which is implemented in distribution grids to meet the necessary power and for power quality improvement. In the proposed model, the DC source of the DVR is the PV array and energy storage system consisting of a lithium-ion battery. Moreover, the renewable energy source can supply the DVR or charge the lithium-ion battery occasionally. Solar photovoltaic with boost converter is implemented by Perturb and Observe (P&O) method to track the Maximum power. In addition, the lithium-ion battery is assigned with the bidirectional buck boost converter to conduct the charge/discharging operation. The DVR is regulated using a fuzzy logic controller FLC method to compensate for load voltage sag, swell, and harmonies. The control strategies aim to regulate the DVR voltage via an inject ion transformer to compensate for the required voltage while maintaining the load voltage constant. The proposed DVR ability to mitigate voltage sag, swell, and harmonies in a low voltage distribution system was demonstrated by experimental results.