摘要
文章建立了双馈风力发电机经串补线路接入无穷大系统的模型。考虑了转子侧变换器的影响,对双馈型风电机组次同步频率下的等值电路进行新的推导和分析,得到了风速、串补度对次同步振荡的频率及系统阻尼的影响特性,从机理上得到了DFIG转子侧变流器比例系数对系统稳定性的影响特性。文章对不同工况的时域进行仿真验证,最后基于机理分析提出了转子侧引入虚拟电阻抑制次同步振荡的策略,该策略可以增大次同步频率下系统的阻尼,能起到抑制次同步振荡的作用。
First, modal of a doubly-fed induction generator （DFIG）-based wind energy system interconnected with a series compensated electric network is established in this paper. Then considering the influence of rotor side converter （RSC）, The equivalent circuit of the double fed wind power generator at subsynchronous frequency is deduced and analyzed, checked the impacts on SSR from the factors such as wind speed, series compensation degree and the control parameters of RSC and the influence of the damping characteristics of the system. And considering all the analysis, the effects of wind speeds, compensation levels and the parameters of RSC on the characteristics of SSR are analyzed by time-domain simulation method for different working condition in the simulation platform. Finally, a SSR damping control strategy based on virtual resistance is developed, it can increase the damping of the system at sub-synchronous frequency, and can suppress the subsynchronous oscillation of wind power systems. The simulation verify the effectiveness of the strategy.
出处
《可再生能源》
CAS
北大核心
2018年第1期57-63,共7页
Renewable Energy Resources
基金
中国工程院咨询项目(2012-ZD-16)
