OSCILLATION SUPPRESSION STRATEGY FOR GRID-FORMING CONVERTERS WITH MULTI-MACHINE PARALLEL CONSIDERING DECENTRALIZED TRANSIENT DAMPING

Mao Rui; Su Xiaoling; Zhao Zhengkui; Chen Laijun; Pei Wei

doi:10.19912/j.0254-0096.tynxb.2025-0562

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 456-466. DOI: 10.19912/j.0254-0096.tynxb.2025-0562

OSCILLATION SUPPRESSION STRATEGY FOR GRID-FORMING CONVERTERS WITH MULTI-MACHINE PARALLEL CONSIDERING DECENTRALIZED TRANSIENT DAMPING

Mao Rui¹, Su Xiaoling¹, Zhao Zhengkui¹, Chen Laijun^1,2, Pei Wei^1,3

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Abstract

Influenced by the difference of inertia, damping and other parameters, the grid-forming voltage-source converters （GFM-VSC） operating in parallel with multiple machines is very susceptible to power-frequency oscillations under the change of operating environment. In this paper, firstly, based on the small-signal model, the root trajectory and Bode diagram are used to determine the main causative factors and mechanisms triggering the power-frequency oscillations of the grid-type converter multi-machine paralleling system. Secondly, according to the state feedback theory, a decentralized transient damping lifting control strategy is proposed to improve the damping of a single GFM-VSC by angular frequency compensation and electromagnetic power compensation. On this basis, the additional mutual damping torque is introduced to reduce the angular frequency difference of the multi-GFMVSC and improve the system coordination. Finally, the correctness of the control strategy is proved by using the Lyapunov functions, and the feasibility and effectiveness of the proposed control is verified by simulation and experimental results.

Key words

grid-forming converters / power frequency oscillation / root locus state feedback / decentralized transient damping / Lyapunov functions

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Mao Rui, Su Xiaoling, Zhao Zhengkui, Chen Laijun, Pei Wei. OSCILLATION SUPPRESSION STRATEGY FOR GRID-FORMING CONVERTERS WITH MULTI-MACHINE PARALLEL CONSIDERING DECENTRALIZED TRANSIENT DAMPING[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 456-466 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0562

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