An optimal control method for photovoltaic grid tied-interleaved fly-back micro-inverters to achieve high efficiency in wide load range
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The document discusses control strategies for interleaved flyback microinverters used in photovoltaic systems. It analyzes boundary conduction mode and discontinuous conduction mode control strategies, noting their different impacts on loss distribution and efficiency under varying loads. A new hybrid control strategy is proposed that combines two-phase discontinuous conduction mode control with heavy loads and one-phase discontinuous conduction mode control with light loads, to improve efficiency across a wide range of loads by reducing dominant losses. An optimal design method is also presented based on the boundary conditions of the hybrid control strategy.
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An optimal control method for photovoltaic grid tied-interleaved fly-back micro-inverters to achieve high efficiency in wide load range
- 1. AN OPTIMAL CONTROL METHOD FOR PHOTOVOLTAIC GRIDTIED-INTERLEAVED FLY-BACK MICRO-INVERTERS TO ACHIEVE HIGH EFFICIENCY IN WIDE LOAD RANGE ABSTRACT: Boundary conduction mode (BCM) and discontinuous conduction mode (DCM) control strategies are widely used for the flyback microinverter. The BCM and DCM control strategies are investigated for the interleaved flyback microinverter concentrating on the loss analysis under different load conditions. These two control strategies have different impact on the loss distribution and thus the efficiency of the flyback microinverter. For the interleaved flyback microinverter, the dominant losses with heavy load include the conduction loss of the power MOSFETs and diodes, and the loss of the transformer; while the dominant losses with light load include the gate driving loss, the turn-off loss of the power MOSFETs and the transformer core loss. 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 optimal design method based on the boundary condition of the hybrid control is also presented. The experimental results verify the benefits of the proposed control.