Abstract
An isolated photovoltaic micro-inverter for standalone and grid-tied applications is designed and implemented to achieve high efficiency. System configuration and design considerations, including the proposed active-clamp forward-flyback resonant converter for the DC-DC stage and a dual-frequency full-bridge inverter for the DC-AC stage, are analyzed and discussed. A prototype microinverter system is built and tested. Experimental results verify the feasibility of the proposed system, which achieves 95% power conversion efficiency at full load.
Highlights
Photovoltaic (PV) energy systems have been extensively studied in research and industries as an alternative to fossil fuels to reduce greenhouse effects [1,2,3]
As Gallium Nitride (GaN) switches operate with low rise and fall times, parasitic inductances and capacitances in the printed circuit board (PCB) layout must be minimized to avoid excessive ringing in the circuit [20]
An isolated PV microinverter was studied for standalone and grid-tied applications
Summary
Photovoltaic (PV) energy systems have been extensively studied in research and industries as an alternative to fossil fuels to reduce greenhouse effects [1,2,3]. Compared with the current Silicon (Si) technology, WBG devices provide significant advantages of high operating temperature, fast switching speed, and low on-resistance. They can reduce switching losses to enable high-frequency operation and achieve high-efficiency performance. The microinverter is implemented with WBG devices for PV panel applications to achieve low harmonic distortion, small circuit size and high efficiency. The contributions of this work are: (1) the introduction and analysis of the resonant control strategy of the active-clamp forward-flyback converter to allow for ZVC and ZCS to reduce losses, and (2) the implementation and experimental validation of the interleaved active-clamp forward-flyback converter using WBG devices to achieve a highly-efficiency PV microinverter
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