Novel High-Performance Stand-Alone Solar PV System With High-Gain High-Efficiency DC–DC Converter Power Stages


This paper proposes a unique 3 $phi$ stand-alone solar photovoltaic (PV) system configuration that uses high-gain high-efficiency $(approx! 96%)$ dc–dc converters each within the forward power stage and also the bidirectional battery interface. The high-voltage-gain converters enable the use of low-voltage PV and battery sources. This ends up in minimization of partial shading and parasitic capacitance effects on the PV source. Series connection of a large variety of battery modules is obviated, preventing the overcharging and deep discharging issues that cut back the battery life. In addition, the proposed configuration facilitates “needed power tracking (RPT)” of the PV supply as per the load needs, eliminating the utilization of pricy and “tough to manage” dump hundreds. High-performance inverter operation is achieved through $abc$ to $dq$ reference frame transformation, that helps in generating precise info regarding the load's active power part for RPT, regulation of ac output voltage, and minimization of management complexity. Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulsewidth modulation, resulting during a stable and reliable system operation. The active power demand is controlled by regulating the dc link voltage. All the analytical, simulation, and experimental results of this work are presented.

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