Single-phase grid-tie photovoltaic inverter using maximum power point tracking with flyback converter

This paper introduces a topology for single-phase grid-tie inverter with a combination of switching strategy of sinusoidal pulse width modulation (SPWM) and square wave signals under grid synchronization condition, used for residential photovoltaic power integration. To match the impedance between photovoltaic panel and load and to boost the panel voltage a dc-dc flyback topology is employed. Moreover, maximum power point tracking algorithm (perturb & observe) is implemented, in order to extract maximum power available from photovoltaic panel. The strategy of grid synchronization and sending power into the grid are described in detail. Therefore, the control strategy and simulation results for the proposed system are discussed and analyzed.