AN IMPROVED FEEDFORWARD STRATEGY TO REDUCING DEAD-TIME EFFECT OF GRID-CONNECTED INVERTER

Li Yuze; Zhang Xin; Guo Bin; Liao Zhiling; Liu Zhangjie

doi:10.19912/j.0254-0096.tynxb.2023-2089

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (4) : 143-152. DOI: 10.19912/j.0254-0096.tynxb.2023-2089

AN IMPROVED FEEDFORWARD STRATEGY TO REDUCING DEAD-TIME EFFECT OF GRID-CONNECTED INVERTER

Li Yuze¹, Zhang Xin², Guo Bin², Liao Zhiling³, Liu Zhangjie¹

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Abstract

This paper takes three-phase LC type grid-connected inverters as the research object. Firstly, from the perspective of closed-loop transfer function,it is revealed that the interaction between traditional PCC voltage feedforward strategy and line impedance amplifies the harmonics introduced by dead-time, thereby deteriorating the system power quality under a weak grid from the perspective of closed-loop transfer function. On this basis, this paper proposes an improved PCC voltage feedforward control strategy based on high-pass and low-pass filters. This control strategy is suitable for high-power applications. It can improve the power quality and reduce the dead-time effect of the system while taking the dynamic performance and the system stability into account. Finally, the effectiveness of the proposed control strategy is validated through simulation and experiment.

Key words

inverters / feedforward control / power quality / dead-time / weak grid

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Li Yuze, Zhang Xin, Guo Bin, Liao Zhiling, Liu Zhangjie. AN IMPROVED FEEDFORWARD STRATEGY TO REDUCING DEAD-TIME EFFECT OF GRID-CONNECTED INVERTER[J]. Acta Energiae Solaris Sinica. 2025, 46(4): 143-152 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2089

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