CRH3型动车组牵引传动系统的直接转矩控制研究

Research of direct torque control on traction drive system of CRH3 EMU

为了研究高速动车组的具体模型结构及其牵引传动控制系统,采用直接转矩控制(DTC)系统控制异步牵引电机,建立了CRH3型高速动车组牵引传动系统的Matlab/simulink仿真模型,整流部分由四象限脉冲整流器输出3 000 V左右平滑的直流电压,逆变部分由直接转矩控制系统驱动牵引电机。该系统能根据CRH3型动车组的牵引、制动曲线模拟动车组牵引、惰行、制动等各种运行工况。整个运行过程中系统的谐波较小,电压/电流相位差基本能保持在同相或反相运行,功率因数基本接近1;在网压波动和突然失电情况下,机车也基本能保持恒速运行。最后,将该模型仿真结果与京津城际高速铁路的部分数据进行了对比验证。研究结果表明,该模型建模基本正确,同时系统具有良好的稳态和动态性能,验证了直接转矩控制方法的有效性。

Aiming at studying the specific model and traction control system of high-speed EMU,using direct torque control（DTC） system to control asynchronous traction motors,the Matlab/Simulink model of a high-speed CRH3 EMU traction and drive system was established.DC voltage of 3 000 V was output with four-quadrant pulse rectifier,and drive traction motors was controlled by DTC system in inverter part.According to the traction and braking curves of CRH3 EMU,the traction,idle line,regenerative brake and other operating condition were simulated.In the entire operation process,harmonics are small,voltage/current phase can be maintained at the same phase or reversed-phase,power factor is close to 1.At the situation of net voltage fluctuation and a sudden loss of electricity,the locomotive can maintain constant speed operation.Finally,compared with the data of Beijing-Tianjin inter-city high-speed rail,the results indicate that the model is basically correct,and the system has a good steady-state and dynamic performance,the effectiveness and correctness of direct torque control method are verified.