双馈风电机组次同步谐振分析与抑制策略

Analysis and Suppression Strategies on Sub-synchronous Resonance of DFIG

双馈风电机组(DFIG)控制器和串补输电系统之间的相互作用可能引起风电场次同步谐振(SSR)现象。通过深入研究双馈风电机组控制器和次同步谐振电路之间的相互作用,在深入分析利用陷波器(ANF)阻断谐振电流流入控制器实现次同步谐振抑制和附加阻尼控制器改善控制系统的阻尼特性抑制次同步谐振2种方法的基础上,提出结合陷波器和附加阻尼控制器的次同步谐振综合抑制方法,最后通过Matlab软件对这种策略进行仿真验证,为解决风电场次同步谐振问题提供理论支撑。

The interaction between the controller of doubly-fed induction generato(r DFIG)and series compensated transmission system may induce sub-synchronous resonance(SSR)in wind farm. Two approaches to suppress SSR were proposed by deeply exploring the relationship between the controller of DFIG and SSR circuit. The first method is to take advantage of adaptive notch filter(ANF)to mitigate the influence of SSR by cutting off SSR current feed into the controller;the second one relies on additional damping controller with band- pass filter(BPF)in order to improve the damping of the system to suppress SSR. The theory and principle of these two methods was derived,followed by the detailed introduction of design methods. Eventually,the strategy combined the two methods of suppressing SSR was verified through simulation on Matlab,which provides a theoretical support for solving the SSR in wind farm.