A hybrid control method for photovoltaic grid-connected interleaved flyback micro-inverter to achieve high efficiency in wide load range
For flyback micro-inverters, Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used. Loss analysis is investigated for the interleaved flyback micro-inverter under BCM and DCM control strategies under different load condition. The BCM and DCM control strategies have different impact on the loss distribution and thus the efficiency of the flyback micro-inverter. Based on the loss analysis, a new hybrid control strategy combing the two-phase DCM and one-phase DCM control is proposed to improve the efficiency in wide load range by reducing the dominant losses depending on the load current. The experimental results verified the benefits of the proposed control.