内燃机车异步发电系统分析

Analysis on Asynchronous Power Generation System for Diesel Locomotive

针对内燃机车牵引发电系统中异步发电机稳态工作时电机功率因数和效率低的问题,采用无功功率为零和最大转矩电流比控制方法,分析了异步电机旋转坐标系下电磁关系,分别完成无功功率为零和最大转矩电流比(MTPA)控制的方程解析式的解读;在中间直流环节限制下,分析异步发电机的弱磁曲线,寻找最小电流工作点,完成电流轨迹规划;在保证牵引发电系统稳定运行的前提下,提高电机与逆变器的工作效率,并利用Simulink仿真软件对系统进行分析。

Aiming at the problem of low power factor and efficiency of the asynchronous motor in the steady-state operation of the asynchronous generator in the traction power generation system of the diesel locomotive, the zero reactive power and the maximum torque-current ratio control method was adopted. Firstly, the electromagnetic relation of the induction motor in the rotating coordinate system was analyzed, and the equations of zero reactive power and maximum torque current ratio(MTPA) control were discussed. Secondly, under the limitation of the intermediate DC link, the field weakening curve of the asynchronous generator was analyzed, the minimum current operating point was found, and the current trajectory planning was completed. On the premise of ensuring the stable operation of the traction power generation system, the working efficiency of the motor and the inverter was improved. Finally, simulation of system was taken out with Simulink software.