STRATEGY FOR RATIO ALLOCATION OF GRID-FOLLOWING AND GRID-FORMING UNITS IN A MULTI-INVERTER GRID-CONNECTED SYSTEM

Shi Yong; Jiang Tao; Xie Bao; Zhang Jian; Su Jianhui

doi:10.19912/j.0254-0096.tynxb.2024-1863

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 20-30. DOI: 10.19912/j.0254-0096.tynxb.2024-1863

STRATEGY FOR RATIO ALLOCATION OF GRID-FOLLOWING AND GRID-FORMING UNITS IN A MULTI-INVERTER GRID-CONNECTED SYSTEM

Shi Yong^1,2, Jiang Tao^1,2, Xie Bao^1,2, Zhang Jian^1,2, Su Jianhui^1,2

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Abstract

Aiming at the stability prob-lems caused by the dynamic interactions between the existing parallel system of multi-grid-following （GFL） inverters and the weak grid, we study the influence of grid-forming （GFM） inverters on the stability of the grid-connected system in a multi-inverter grid-connected system, and propose a strategy for the proportional allocation of grid-following and grid-forming units in a multi-inverter grid-connected system. Based on the monotonicity of the power transfer of GFL inverters and the quasi-static model of mixed parallel connection of inverters, the influence of the interaction between the phase-locked loop （PLL） and the virtual synchronous machine （VSG） synchronization loop on the steady-state operating point of the GFL inverters and the GFM inverters is discussed to obtain the re-lationship between the synchronization stability, grid impedance and grid voltage in the grid-connected multivariate inverter system under a weak grid. The proposed strategy can derive the corresponding critical values of grid impedance for different unit ratio configurations, and then different unit ratio configurations are given according to different grid strengths to ensure the stable operation of the grid-connected multi-inverter system. The validity of the proposed method was experimentally verified.

Key words

stability / grid-connected inverter / grid-forming / grid-following / allocation strategy / weak grid

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Shi Yong, Jiang Tao, Xie Bao, Zhang Jian, Su Jianhui. STRATEGY FOR RATIO ALLOCATION OF GRID-FOLLOWING AND GRID-FORMING UNITS IN A MULTI-INVERTER GRID-CONNECTED SYSTEM[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 20-30 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1863

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