TRANSIENT STABILITY ANALYSIS AND ENHANCEMENT STRATEGY RESEARCH OF GRID-FOLLOWING CONVERTERS CONSIDERING DC-LINK VOLTAGE CONTROL

Li Qiushuo; Dong Xinwei; Wang Yaoxin; Nian Heng; Lyu Kangfei; Zhao Jianyong

doi:10.19912/j.0254-0096.tynxb.2024-0948

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 403-411. DOI: 10.19912/j.0254-0096.tynxb.2024-0948

TRANSIENT STABILITY ANALYSIS AND ENHANCEMENT STRATEGY RESEARCH OF GRID-FOLLOWING CONVERTERS CONSIDERING DC-LINK VOLTAGE CONTROL

Li Qiushuo¹, Dong Xinwei¹, Wang Yaoxin², Nian Heng², Lyu Kangfei³, Zhao Jianyong²

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Abstract

Considering the influence of DC-link voltage control（DVC）, the stable operation and synchronization control strategy of grid-following converters under weak grid conditions are studied. Firstly, a large disturbance model of grid-following converters with consideration of DVC is established. Based on this, by analogy with the rotor angle oscillation equation of traditional synchronous generators, the damping ratio of the system is derived, reflecting the transient instability mechanism and influencing factors under large disturbances. The existence and stability of the system equilibrium point are analyzed by drawing the power-current curve of the system. Then, a transient stability enhancement method for GFL-VSC based on phase-locked loop adaptive parameter, power angle compensation, and variable angular velocity is proposed. Finally, the simulation results of Matlab/Simulink prove the accuracy of the transient stability analysis and the effectiveness of the proposed control strategy.

Key words

converter / voltage dips / transient stability / PLL / DC-link voltage control

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Li Qiushuo, Dong Xinwei, Wang Yaoxin, Nian Heng, Lyu Kangfei, Zhao Jianyong. TRANSIENT STABILITY ANALYSIS AND ENHANCEMENT STRATEGY RESEARCH OF GRID-FOLLOWING CONVERTERS CONSIDERING DC-LINK VOLTAGE CONTROL[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 403-411 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0948

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