基于改进复转矩系数法的风电场并网引发电力系统次同步振荡研究

doi:10.19595/j.cnki.1000-6753.tces.190690

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Abstract To examine the torsional sub-synchronous oscillations of power system systems caused by the dynamic interactions between grid-connected wind farms and synchronous units, this paper establishes a multi-input and multi-output closed-loop interconnect system model, which divides the system into synchronous machine subsystem and wind farm subsystem. On the basis of pointing out the defects of the traditional complex torque coefficients method, an improved complex torque coefficients method based on eigenvalue sensitivity is proposed. The effects of the variation of steady-state flow and dynamic interactions introduced by integration of wind farms are considered. Finally, the effectiveness of the proposed method in a single-machine and a multi-machine power system with grid-connected wind farms is verified by simulation analysis. From the perspective of damping mechanism, the near strong modal resonance phenomenon between the synchronous machine shaft system and the DFIG wind farm is explained. The influence of the control parameters of the VSC, the load of the transmission system and the level of the dynamic interactions on the near strong modal resonance between the shaft system of synchronous generators and control system of the wind farms are analyzed.

Key words： Sub-synchronous oscillations improved complex torque coefficients method doubly-fed induction generators dynamic interactions near strong modal resonance

Received: 12 June 2019

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TM712

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	Wang Yijun
	Du Wenjuan
	Chen Chen
	Wang Haifeng

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Wang Yijun,Du Wenjuan,Chen Chen等. Study on Sub-Synchronous Oscillations of Power Systems Caused by Grid-Connected Wind Farms Based on the Improved Complex Torque Coefficients Method[J]. Transactions of China Electrotechnical Society, 2020, 35(15): 3258-3269.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190690 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I15/3258

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