【摘要】 论述了变速双馈风力发电系统电网故障时的控制策略,提出了电网故障时转子过流保护、机械振荡阻尼控制、电压支持控制和无功功率泵升控制等策略,并通过仿真分析了三相短路故障时变速双馈风电系统的动态性能,采用该文的控制策略可有效保护变换器,抑制机械振荡,提供一定的电压支持和无功功率泵升能力,使双馈风电系统具有较好的故障不脱网运行能力,并提高了整个电力系统的稳定性。更多还原

【Abstract】 With the increasing penetration of wind energy into power system,many countries’ grid codes improve the requircments of wind turbines,and require for the capabilities of fault ride through and voltage support during grid faults.The control strategy of variable speed doubly fed induction generator(DFIG) during grid faults are presented,including crowbar protection, oscillation damping control,voltage support and reactive power boosting.Based on the simulation,the dynamic performance of DFIG wind turbines during 3-phase short-circuit fault are analyzed.With the control strategy,the converter is protected effectively, oscillation is damped significantly,grid voltage can be supported and reactive power can be boosted,which makes the DFIG wind turbines have better capability of fault ride through and improve the stability of power transmission system.更多还原