SSO MITIGATION OF WIND TURBINE USING DFIG BASED ON IMPEDANCE OPTIMIZATION RESHAPING UNDER VARIABLE WIND CONDITIONS

Liu Qihui; Tian Ruohan; Shi Chun; Ning Wenyuan

doi:10.19912/j.0254-0096.tynxb.2021-1579

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (5) : 349-359. DOI: 10.19912/j.0254-0096.tynxb.2021-1579

SSO MITIGATION OF WIND TURBINE USING DFIG BASED ON IMPEDANCE OPTIMIZATION RESHAPING UNDER VARIABLE WIND CONDITIONS

Liu Qihui¹, Tian Ruohan¹, Shi Chun², Ning Wenyuan³

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Abstract

Aiming at the SSO problem caused by the grid-connected series-compensated capacitors of doubly-fed wind turbines, a SSO suppression strategy based on optimal reshaping of variable wind condition impedance was proposed. The frequency domain impedance model of the DFIG in the abc coordinate system is established, and based on the aggregated RLC stability criterion, the key factors that induce and affect the SSO are screened out by the through sensitivity analysis method under variable wind conditions. Considering the influence of wind conditions and other factors on the stability characteristics of the unit, this paper proposes a SSO suppression strategy based on impedance reshaping. The parameter values in the suppression strategy are selected by the optimization algorithm, and the parameter optimization fitting scheme of "offline tabulation and real-time parameter adjustment" is formed, so that the SSO can achieve better suppression effect under different wind conditions, and it is verified by time domain simulation The effectiveness of the suppression strategy proposed in this paper.

Key words

doubly-fed wind power generator / wind power / sub-synchronous oscillation / sensitivity analysis / impedance reshaping / variable wind conditions

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Liu Qihui, Tian Ruohan, Shi Chun, Ning Wenyuan. SSO MITIGATION OF WIND TURBINE USING DFIG BASED ON IMPEDANCE OPTIMIZATION RESHAPING UNDER VARIABLE WIND CONDITIONS[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 349-359 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1579

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