Because of volatility of the output power of wind farm and long-distance transmission, inter-area oscillation is an issue faced in interconnected power systems connected large-scale wind farms. A small signal dynamic model for large-scale double-feed wind power generation system is established, which generally includes four parts, I.e., the dynamic equation of wind turbine model and its drive system, asynchronous generator, converter, and control system of converter. Taking the rotor-side converter's active power reference of DFIG as the input signal and the rotor angle difference of interconnected power systems as the output signal, the opened-loop transfer function between the two signals is obtained by system identification method. Based on the opened-loop transfer function, DFIG's wide-area damping controller is designed in terms of pole placement technology. Nonlinear time-domain simulations demonstrate that large-scale wind farm equipped with the designed damping controller can effectively suppress the low frequency oscillation of the interconnected power systems.%由于风电场输出功率的波动性及远距离输电等原因,大规模风电场接入互联电力系统后会面临不同区域电网间的低频振荡问题.建立了大型双馈风力发电系统的小信号动态模型,该模型包括风力机及传动系统动态方程、异步发电机动态方程、变频器动态方程以及变频器控制系统动态方程4个部分,具有一般性.以双馈风力发电机转子侧变流器有功功率参考值为输入,以互联电力系统区域间同步发电机功角差值为输出,通过系统辨识方法得到二者间的开环传递函数.在此基础上,利用极点配置方法,设计了双馈风力发电机的附加阻尼控制器.非线性时域仿真表明,配备了阻尼控制器的大规模风电场能够有效抑制互联系统的低频振荡,增加互联系统的阻尼.
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