DSP-based two-switch flyback solar micro inverter

Abstract: Flyback inverter is known as a low cost solution for photovoltaic (PV) ac module application. This study presents atwo-switch flyback inverter followed by a low frequency unfolding bridge for fractional horse power water pumping systems. This topology mitigates the problem of high-voltage transients at switch turn off which commonly exists in single switch flybackinverters. Moreover, the proposed control strategy achieves an integration of a novel sensorless maximum power point tracking (MPPT) algorithm as well as a constant v/f control for the efficient utilisation of both the PV panel and the motor. The proposedcontrol algorithm minimises the cost and simplifies the control strategy. The validity and capability of the proposed method are verified by both simulation and practical results of a DSP-based two-switch flyback solar micro inverter for a fractional horsepower water pumping system