IMPROVING GRID-FORMING WIND TURBINE POWER QUALITY BY UPQC BASED ON NINE-SWITCH CONVERTOR

Hang Yuqi; Ren Yongfeng; Xu Feng; Wu Nan; Cui Wei; Zhao Shuai

doi:10.19912/j.0254-0096.tynxb.2024-0843

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 122-132. DOI: 10.19912/j.0254-0096.tynxb.2024-0843

IMPROVING GRID-FORMING WIND TURBINE POWER QUALITY BY UPQC BASED ON NINE-SWITCH CONVERTOR

Hang Yuqi¹, Ren Yongfeng¹, Xu Feng², Wu Nan², Cui Wei³, Zhao Shuai⁴

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Abstract

Grid-forming wind turbine generator exhibits excellent performance in weak grids, providing frequency and voltage support to the grid. However, the integration of a high proportion of power electronic devices may lead to grid harmonic pollution, while failures of renewable energy clusters to ride through, faults can cause transient impacts on the grid, worsening power quality. To address these issues, this paper proposes the utilization of a Unified Power Quality Conditioner （UPQC） based on nine-switch converter to achieve harmonic mitigation and source-grid fault isolation, significantly reducing the risk of converter current exceeding limits. To suppress circulating currents generated by parallel operation of multiple turbines and enhance active support during grid-forming wind turbine cluster fault ride-through, the mechanism of virtual synchronous machine power coupling and transient power angle stability are analyzed. Traditional strategies are improved based on reactive power loop supplementary voltage compensation and adaptive active power control. Simulink simulation results under various operating conditions demonstrate that the proposed topology and control strategies exhibit superior dynamic performance, achieving the desired control effects.

Key words

wind turbine / electric machine control / harmonic analysis / fault current limiters / nine switch convertor / unified power quality conditioner

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Hang Yuqi, Ren Yongfeng, Xu Feng, Wu Nan, Cui Wei, Zhao Shuai. IMPROVING GRID-FORMING WIND TURBINE POWER QUALITY BY UPQC BASED ON NINE-SWITCH CONVERTOR[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 122-132 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0843

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