IMPEDANCE REMODELING METHOD OF GRID CONNECTED INVERTER COMBINED WITH DIGITAL DELAY COMPENSATION

Li Jianwen; Ma Xiaotang; Wu Binyuan; Li Rong; Yang Ruiqing

doi:10.19912/j.0254-0096.tynxb.2021-1388

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 316-323. DOI: 10.19912/j.0254-0096.tynxb.2021-1388

IMPEDANCE REMODELING METHOD OF GRID CONNECTED INVERTER COMBINED WITH DIGITAL DELAY COMPENSATION

Li Jianwen, Ma Xiaotang, Wu Binyuan, Li Rong, Yang Ruiqing

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Abstract

This paper firstly establishes the impedance model of grid-connected inverter to explore the reasons why the digital delay leads to the decrease of system stability, and then a grid-connected inverter impedance reshaping method combined with digital delay compensation is proposed, including delay compensation predicted by Newton interpolation Strategy and Inverter Impedance Reshaping Strategy. This method can effectively weaken the adverse effect of digital delay on the output impedance of the inverter, improve the phase margin at the frequency of the impedance intersection point, and broaden the scope for the grid-connected system to adapt to grid impedance changes. Finally, based on the hardware-in-the-loop simulation platform RT-LAB, a grid-connected inverter model is established for experiments to verify the effectiveness of the proposed method.

Key words

LCL-type grid-connected inverter / weak grid / grid connected control / stability / delay

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Li Jianwen, Ma Xiaotang, Wu Binyuan, Li Rong, Yang Ruiqing. IMPEDANCE REMODELING METHOD OF GRID CONNECTED INVERTER COMBINED WITH DIGITAL DELAY COMPENSATION[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 316-323 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1388

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