【作者】 姚骏； 李清； 刘奥林； 杜红彪； 陈知前；

【Author】 YAO Jun,Li Qing,LIU Ao-lin,DU Hong-biao,CHEN Zhi-qian(State Key Laboratory of Power Transmission Equipment & System and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China)

【机构】 输配电装备及系统安全与新技术国家重点实验室(重庆大学)；

【摘要】 为避免电网发生不对称故障时串联网侧变换器(series grid-side converter,SGSC)抑制定子电压负序分量时引入较多陷波器所带来的延时以及动态性能问题,提出了采用两相静止坐标系下的比例谐振(proportional-resonant,PR)控制器以实现对定子电压负序分量的抑制,同时改变故障期间转子侧变换器(rotor-side converter,RSC)的工作方式以实现发电机向电网快速注入额定的无功电流来辅助电网电压的恢复。仿真结果表明:本文所提的增强控制策略可实现电网对称以及不对称故障下DFIG系统的低电压穿越运行,发电系统可向电网提供快速稳定的无功支持,提高了故障期间整个系统的动态性能,显著增强了电网故障下DFIG风电系统的不间断运行能力。更多还原

【Abstract】 In order to avoid the delay and dynamic performance problems caused by the notches when using series grid-side converter(SGSC) to mitigate the negative-sequence stator voltage under unsymmetrical grid fault,this paper presents to restrain the negative-sequence stator voltage by using a proportional-resonant(PR) controller in the two phase stationary reference frame.In the meanwhile,the operation mode of rotor-side converter(RSC) is modified to realize the rated reactive current injected into the grid rapidly,which means that grid voltage recovery can be achieved by associating with the generation system.Simulation results show that the enhanced control strategy can realize low voltage ride-through operation of doubly-fed induction generator(DFIG) system under both symmetrical and unsymmetrical grid faults.Furthermore,the proposed control strategy can provide fast and steady reactive power support to the grid,which improving the dynamic performance of the whole system during the faults and effectively enhances the ride-through capability of DFIG-based wind power generation system.更多还原