基于双馈风机转子侧变流器的次同步谐振抑制方法

从双馈风机产生次同步谐振的机理出发,当双馈风机转速变化时,其电磁转矩变化量可以分为转子转矩变化量和定子转矩变化量两部分。基于双馈风机转子侧变流器,提出一种新的抑制次同步谐振的附加阻尼控制策略。通过在转子侧变流器控制策略中引入附加控制,产生一个与转速反相的附加转矩,为系统提出正阻尼。然后,利用PSCAD/EMTDC对所提出的附加阻尼控制策略进行仿真验证。结果表明,通过对转子侧变流器进行附加阻尼控制后,可以有效抑制次同步谐振的发生。

Subsynchronous Resonance Suppression Method Based on Rotor-side Converters in DFIG-based Wind Turbines

According to the mechanism of subsynchronous resonance(SSR)in doubly-fed induction generator(DFIG)based wind turbine, the electromagnetic torque variation under the variation of rotor speed can be divided into two parts, i. e. , the rotor torque variation and the stator torque variation. Based on the rotor-side converter in the DFIG-based wind turbine, a new additional damping control strategy for suppressing SSR is proposed. An additional controller is added to the rotor-side coverter. Then an additional torque which is in opposite phase with the rotor speed is generated to provide positive damping for the system. Finally, PSCAD/EMTDC is applied to simulate and verify the proposed strategy. The results show that SSR can be effectively suppressed by applying the additional damping control strategy to the rotor side converter.