RESEARCH ON IMPACT OF OUTER POWER LOOP ONSTABILITY OF GRID-CONNECTED DFIG

Ma Songtao; Xu Wenjia; Xiang Zutao; Gao Zhixuan; Zhou Yunbin; Sha Licheng

doi:10.19912/j.0254-0096.tynxb.2024-2168

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 307-319. DOI: 10.19912/j.0254-0096.tynxb.2024-2168

RESEARCH ON IMPACT OF OUTER POWER LOOP ONSTABILITY OF GRID-CONNECTED DFIG

Ma Songtao¹, Xu Wenjia¹, Xiang Zutao¹, Gao Zhixuan¹, Zhou Yunbin², Sha Licheng²

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Abstract

The outer-loop control is often ignored when using impedance method to solve the stability problem of the grid-connected doubly fed induction generator （DFIG） system. However, the influence of ignoring the outer-loop control on the stability of the system has not been deeply studied. To solve this problem, firstly, this paper proposes a broadband frequency admittance model of DFIG which includes both stator- rotor side converter （RSC） and grid side converter （GSC） with integrated power outer-loop controls. The accuracy and validity of the proposed admittance model are verified by electromagnetic transient simulation model. Secondly, based on the actual operational parameter ranges provided by wind turbine manufacturer, influence of variations in outer-loop control parameters on the admittance characteristics of DFIG is analyzed theoretically. The results demonstrate that variations in proportional coefficients significantly affect the admittance characteristics of DFIG. Further studies indicate that overlooking RSC outer-loop control may hinder the recognition of oscillation problems when using the impedance method in the grid-connected DFIG system across various frequency bands. This may lead to erroneous assessment of an actually oscillatory system as stable system, thereby posing a risk to the safe operation of the power system. Next, a practical example of grid-connected DFIG wind farm is established, and the impact of RSC outer-loop control parameters on oscillation stability is observed by the variation of RSC outer-loop control parameters, which validates the crucial role of incorporating the power outer-loop when impedance analysis is applied for oscillation stability assessment of grid-connected DFIG system.

Key words

doubly fed induction generator / admittance / stability / vector control / Nyquist diagrams / outer power loop

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Ma Songtao, Xu Wenjia, Xiang Zutao, Gao Zhixuan, Zhou Yunbin, Sha Licheng. RESEARCH ON IMPACT OF OUTER POWER LOOP ONSTABILITY OF GRID-CONNECTED DFIG[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 307-319 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2168

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