SMALL SIGNAL STABILITY ANALYSIS AND APPLICATION OF DIRECT-DRIVE WIND TURBINE SYSTEM BASED ON MODAL DAMPING ENERGY

Shi Yuxin; Qi Yu; Zhang Yunkai; Liu Cheng; Li Zhengyu; Tao Wenbiao

doi:10.19912/j.0254-0096.tynxb.2024-1974

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (3) : 332-340. DOI: 10.19912/j.0254-0096.tynxb.2024-1974

SMALL SIGNAL STABILITY ANALYSIS AND APPLICATION OF DIRECT-DRIVE WIND TURBINE SYSTEM BASED ON MODAL DAMPING ENERGY

Shi Yuxin¹, Qi Yu¹, Zhang Yunkai², Liu Cheng², Li Zhengyu¹, Tao Wenbiao¹

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Abstract

To analyze the impact of direct-drive wind turbine integration on power system small-signal stability while avoiding complex modeling, this study combines modal energy analysis technology with the eigenvalue method from classical small-signal stability theory, establishing a modal damping energy function for evaluating system dynamic behavior. The low-frequency dynamic phenomena caused by grid integration of direct-drive wind turbines are quantitatively characterized in an energy terms. Firstly, the distribution characteristics of low-frequency oscillation modal damping energy in systems with multiple direct-drive wind turbines integrated into the grid are analytically examined. Subsequently, the modal damping energy of key oscillation links is extracted. Based on modal energy analysis and eigenvalue sensitivity theory, a quantitative stability evaluation framework suitable for direct-drive wind turbine grid-connected systems is established, and the effects of different integration locations of direct-drive wind turbines on power system dynamic oscillation characteristics are investigated. Finally, a small-signal stability regulation strategy for direct-drive wind turbine integration is proposed based on small-signal stability evaluation indices and sensitivity indicators. The reliability and applicability of the proposed method are validated through small-signal stability analysis in both a 3-machine 9-bus system and the New England 10-machine 39-bus system.

Key words

renewable energy / energy function / direct drive wind turbine / low-frequency oscillation / small signal stability / sensitivity

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Shi Yuxin, Qi Yu, Zhang Yunkai, Liu Cheng, Li Zhengyu, Tao Wenbiao. SMALL SIGNAL STABILITY ANALYSIS AND APPLICATION OF DIRECT-DRIVE WIND TURBINE SYSTEM BASED ON MODAL DAMPING ENERGY[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 332-340 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1974

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