VOLTAGE FEEDFORWARD STRATEGY OF GRID-CONNECTED INVERTER BASED ON MULTI-OBJECTIVE CONSTRAINTS IN WEAK GRID

Wang Haining; Wang Xuzhi; Xie Di; Wang Liangliang; Yao Jigang; Liu Jing

doi:10.19912/j.0254-0096.tynxb.2024-0988

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 444-454. DOI: 10.19912/j.0254-0096.tynxb.2024-0988

VOLTAGE FEEDFORWARD STRATEGY OF GRID-CONNECTED INVERTER BASED ON MULTI-OBJECTIVE CONSTRAINTS IN WEAK GRID

Wang Haining¹, Wang Xuzhi¹, Xie Di², Wang Liangliang², Yao Jigang², Liu Jing¹

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Abstract

The impedance model of LCL single-phase grid-connected inverter is established, and the mechanism of phase reduction of inverter output impedance caused by PLL is analyzed. In order to improve the influence of phase-locked loop on system stability, a multi-objective constrained power grid voltage feedforward control strategy is proposed. Firstly, a positive impedance is obtained by designing the transfer function of the voltage feedforward channel at the common coupling point to offset the negative impedance introduced by the phase-locked loop. Secondly, in order to reduce the difficulty of engineering implementation of feedforward control strategy, the original feedforward transfer function is simplified by establishing multi-objective constraints from the aspects of amplitude-frequency deviation and phase-frequency deviation in basic frequency band and middle frequency band, and an approximate equivalent feedforward transfer function is designed. And the stability analysis is presented. Simulation and experiment verify that the proposed method effectively enhances the adaptability of grid-connected inverter in weak grid.

Key words

weak grid / phase-locked loop / grid-connected inverter / impedance remodeling

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Wang Haining, Wang Xuzhi, Xie Di, Wang Liangliang, Yao Jigang, Liu Jing. VOLTAGE FEEDFORWARD STRATEGY OF GRID-CONNECTED INVERTER BASED ON MULTI-OBJECTIVE CONSTRAINTS IN WEAK GRID[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 444-454 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0988

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