混合串补抑制双馈风电场次同步振荡研究

Research on Hybrid Series Compensation for Suppression of SSO in Doubly Fed Wind Farm

随着串联电容补偿输电在风电并网工程中的推广应用,国内外部分双馈风电场(doubly fed induction generator,DFIG)面临着严峻的次同步振荡(subsynchronous oscillation,SSO)问题。为抑制DFIG风电场所面临的SSO问题,文中利用由静态同步串联补偿器(static synchronous series compensatory,SSSC)和固定电容器组成的混合串联补偿装置来实现风电场的并网,并提出了一种混合串补装置换流器附加控制抑制风电场SSO的方法;最后,采用时域仿真的方法验证了混合串补装置附加控制抑制DFIG风电场SSO的有效性,仿真结果同时表明,所设计的附加控制器不会对混合串补装置的运行产生不利影响。文中研究可为DFIG风电场并网系统的设计及SSO抑制提供参考。

With the widespread applications of series compensated capacitors for wind farm integration,some DFIG(doubly fed induction generator)based wind farms are confronting with severe problem of SSO(subsynchronous oscillation).To solve the SSO problem of DFIG based wind farms,hybrid series compensators composed of SSSC(static synchronous series compensator)and fixed capacitor are utilized to integrate the wind farm,and a novel method of supplementary damping control for the converter is proposed to mitigate SSO in this paper.Finally,time domain simulations are performed to verify the SSO damping effectiveness of the designed supplementary damping control.Meanwhile,the simulation results also suggest that the designed supplementary damping control has none negative effect on the performance of the hybrid series compensator.The studies in this paper are supposed to be helpful for the design of the wind farm integration projects and the mitigation of the SSO problem.