静止无功发生器对双馈风电场高频振荡的影响

双馈风电场中静止无功发生器(static var generator, SVG)的接入易引发系统产生高频振荡现象，威胁风电场的安全稳定运行。针对这一问题，首先建立了包含双馈风电机群、集电线路和SVG的高频阻抗模型，同时，在PSCAD/EMTDC中搭建了包含4条风电机群链路、集电线路与SVG的双馈风电场仿真模型，通过阻抗扫描与理论阻抗对比，验证了所建立的双馈风电场高频阻抗模型的准确性；然后，分析了双馈风电场的高频振荡现象，探究了SVG系统参数对双馈风电场高频振荡特性的影响，研究结果表明：SVG延时、内环控制参数与滤波电感是影响SVG高频振荡特性的关键因素；最后，通过仿真验证了理论分析的正确性。

Influence of Static Var Generator on High Frequency Oscillation of Doubly-Fed Wind Farm

The connection of static var generator (SVG) in doubly-fed wind farms can easily cause high frequency oscillation in the system, which seriously threatens the safe and stable operation of wind farms. Therefore, this paper firstly builds a high frequency impedance model including doubly-fed wind turbines, collector lines, and SVG. In addition, in PSCAD/EMTDC, a doubly-fed simulation model considering four wind turbine links, collector lines, and SVG is built. The accuracy of the built high-frequency impedance model of the doubly-fed wind farm is verified by comparing the impedance scan with the theoretical impedance. Furthermore, the high-frequency oscillation of the doubly-fed wind farm is analyzed and the influence of SVG system parameters on the oscillation of the wind farm is explored. The research results show that the SVG delay, inner loop control parameters, and filter inductance are key factors affecting the high-frequency oscillation of SVG. Finally, the correctness of the above theoretical analysis is verified by simulation.