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高速铁路动车组在运行过程中会出现牵引网低频振荡现象,目前对其机理研究处于初期阶段。针对动车组网侧整流器(line-side converter,LSC)采用基于传统PI控制器的瞬态直接电流控制策略(transient current control strategy,TCCS)在发生牵引网低频振荡时通过调节PI控制器参数来抑制振荡的局限性,文中提出将内模控制应用到TCCS中,设计二自由度内模控制器,并用它代替TCCS中的传统PI控制器。然后,仿真对比不同控制策略下LSC的工作特性。最后,将不同控制策略分别应用于车网系统仿真模型中,结果表明,基于二自由度内模控制器的TCCS拥有更好的跟随性能和抗干扰性能,并且能够有效抑制高速铁路牵引网低频振荡。
High-speed railway EMU will appear during the operation of low-frequency traction network phenomenon, the current mechanism of its research is in its infancy. In the line-side converter (LSC), transient current control strategy (TCCS) based on traditional PI controller is adopted to suppress the PI controller parameters during low-frequency oscillation of traction network In this paper, the internal model control is proposed to be applied to TCCS. The two-degree-of-freedom internal model controller is designed and used to replace the traditional PI controller in TCCS. Then, the simulation compares the operating characteristics of LSC under different control strategies. Finally, the different control strategies are respectively applied to the vehicle network simulation model. The results show that the TCCS based on the two-degree-of-freedom internal model controller has better following performance and anti-jamming performance, and can effectively restrain low-frequency oscillation of high-speed railway traction network .