Title: PV micro-inverter with passive equaliser for high power acquisition ratio

Authors: Dongchun Wu; Fei Zhu; Jiawei Tang; Jun Liu; Yunya Wu

Addresses: School of Electrical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China ' School of Electrical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China ' School of Electrical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China ' School of Electrical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China ' School of Electrical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China

Abstract: The micro-inverter is one of the important and efficient utilisation forms of photovoltaic power generation. Generally, there are 3-4 sub-modules in a PV module. When the light intensity is different among sub-modules, the output power of the PV module is dramatically decreased even if a micro-inverter is equipped. A passive equaliser integrated into full-bridge PV micro-inverter is proposed, which is composed of cascaded voltage-doubler rectifiers and a LC series resonant network. The proposed equaliser can be well operated without any additional control and it can supply the current/energy to the sub-module under part shadow. At last, all of the PV sub-modules can be operated near their maximum power point. The operational modes and the design principle of parameters are analysed. The simulation and experimental results verify the obvious advantage in increasing the power acquisition rate to PV panel.

Keywords: PV micro-inverter; voltage equaliser; differential power processing; DPP; LC resonance; power acquisition ratio.

DOI: 10.1504/IJPELEC.2023.129993

International Journal of Power Electronics, 2023 Vol.17 No.3, pp.333 - 355

Received: 05 Jun 2021
Accepted: 25 Nov 2021
Published online: 04 Apr 2023 *

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