单相全桥离网逆变器输出侧功率解耦电路研究

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Abstract The input-current low-frequency ripple suppression of the single-phase inverter is an urgent problem to be solved in the fuel cell and photovoltaic cell power generation system. In this paper, the power decoupling circuit topology on the output side of a single-phase full-bridge off-grid inverter and input-current low-frequency ripple suppression strategy are deeply studied. The design criteria of control and key circuit parameters and experimental waveforms are given. In this circuit topology, the active power decoupling circuit is located on the output side of the full-bridge inverter, and shares the output filter inductance and capacitor with the full-bridge inverter. The power decoupling is achieved by superimposing DC voltage and low-frequency even harmonic voltage on the output filter capacitor. The low-frequency pulsating power on the output side of the inverter is transmitted between the output filter capacitor and the load, blocking its transmission path to the DC side. Theoretical analysis and experimental results verify the effectiveness and feasibility of this method.

Key words： single-phase inverter active power decoupling low-frequency ripple decoupling capacitor

Received: 26 July 2021

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	PENG Liaokuo
	CHEN Yanhui

Cite this article:

PENG Liaokuo,CHEN Yanhui. Research on a single-phase full-bridge off-grid inverter with active power decoupling circuit at output side[J]. Electrical Engineering, 2022, 23(1): 42-48.

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http://dqjs.cesmedia.cn/EN/Y2022/V23/I1/42

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