High-Efficiency Isolated Photovoltaic Microinverter Using Wide-Band Gap Switches for Standalone and Grid-Tied Applications
Yu-Chen Liu,
Ming-Cheng Chen,
Chun-Yu Yang,
Katherine A. Kim,
Huang-Jen Chiu
Affiliations
Yu-Chen Liu
Department of Electrical Engineering, National Ilan University, No. 1, Section 1, Shennong Road, Yilan 260, Taiwan
Ming-Cheng Chen
Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da’an District, Taipei 106, Taiwan
Chun-Yu Yang
Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da’an District, Taipei 106, Taiwan
Katherine A. Kim
School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil Ulju-gun, Ulsan 44919, Korea
Huang-Jen Chiu
Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Road, Da’an District, Taipei 106, Taiwan
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.
