A grid-tied flyback-based PV inverter with BCM variable frequency voltage mode control

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Abstract
The modularized microinverter, which can feed small power to the grid directly, has the merit of increasing the conversion efficiency and installed flexibility of the renewable power generation system. This paper proposes a control method for a microinverter derived from the conventional AC-DC boundary conduction mode (BCM) PFC converter. The variable frequency peak current mode control method and the variable frequency voltage mode control method are proposed for the control of a flyback-based inverter. Modeling of the inverter and quantitative controller design of the variable frequency voltage mode control method is presented. A 120 W experimental system with PV module for generating power is built. The effectiveness of the proposed method is confirmed via simulations and measured results.

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