动车组牵引供电系统采用25kV单相牵引变压器从接触网取电，动车组运行过程中的弓网离线、功率器件的非线性特性、硬件电路和控制系统的不对称性等，都会引起直流分量通过电气回路注入车载牵引变压器，引起变压器的直流偏磁。本文通过将比例-积分-谐振（PIR）控制应用于电流内环控制器，同时实现正弦信号的稳定跟踪和直流分量的抑制。仿真和硬件在环的半实物仿真结果表明该控制策略的有效性。

The traction power supply system of EMU adopts 25kV single-phase transformer to take power from the traction catenary, the disconnection of pantograph-catenary at locomotive running, nonlinear characteristics of power devices, the asymmetry of hardware circuit and control system, which will cause vehicle traction transformer injecting the DC component through the electrical circuit, and lead the DC magnetic bias of transformer. In this paper, by applying the proportional-integral-resonance (PIR) control to the current inner loop controller, the stable tracking of the sinusoidal signal and the suppression of the DC component is realized. The simulation and the hardware-in-the-loop simulation results show the effectiveness of the control strategy.

U266.2