高速动车组无拍频控制方法研究

在高速动车组牵引传动系统中,由于单相供电制式的应用,会在单相脉冲整流器的直流输出环路上叠加一个2倍于电网频率的交流脉动电压分量。该脉动电压分量会使牵引电机产生拍频现象,从而导致牵引电机电流三相不平衡、转矩脉动增大等问题。针对这一现象,提出了一种基于频域分析的无拍频控制算法。该算法是在对拍频形成原理及输出电压谐波的理论分析基础上,通过在牵引逆变器输出频率上叠加一个映射直流电压脉动分量函数进行频率补偿,以消除低频谐波分量。结合矢量控制系统,完成了算法的仿真和试验验证。仿真和试验结果表明,该无拍频算法可有效抑制牵引电机拍频现象。

Beat-less Control Method for High-speed EMU

Due to the application of the single-phase power supply mode in the traction drive system of high-speed EMU, the DC output voltage of the single-phase pulse rectifier is superimposed with an AC ripple voltage component which the frequency is twice the grid frequency. The AC ripple voltage component may cause the traction motor to generate the current beat phenomenon, resulting in problems such as three-phase unbalance of the traction motor current and increased torque ripple. Aiming at the phenomenon, a beat-less control algorithm based on frequency domain analysis was proposed. The algorithm was based on the formation mechanism of beat frequency and theoretical analysis of output voltage harmonics, and frequency compensation was achieved by superimposing a function mapping the DC voltage ripple component on the output frequency of traction inverter, which eliminated the low frequency harmonic components effectively. Combined with vector control system, the simulation and experimental verification of the algorithm were completed. The simulation and experimental results showed that the proposed method could effectively suppress the motor beat phenomenon.