针对内燃机车永磁同步发电系统电机运行效率和功率因数较低的问题，应用最大转矩电流比(MTPA)控制策略来控制牵引变流器，并分析电压极限椭圆限制下的MTPA控制，与单位功率因数控制和id=0控制策略下的功角、功率因数和效率进行对比。仿真对比分析表明：id=0控制调速范围较窄，单位功率因数控制高转速下运行不稳定，MTPA控制可以在全速范围内稳定运行，并且提高了永磁同步发电机的功率因数和效率，增加了系统的稳定性。

Aiming at the problems of low efficiency andlow power factor of the motor in the permanent magnet synchronous power generation system of diesel locomotive, the maximum torque per ampere (MTPA) control strategy is adopted to control the traction converter, and the MTPA control under the limitation of voltage limit ellipse is analyzed. The power angle, power factor and efficiency are compared under the unity power factor control and id=0 control strategies. The simulation and comparison analysis shows that the speed regulation range of the id=0 control is very narrow, the unity power factor control is unstable at high speeds, while the MTPA control can run stably in the full speed range. Furthermore, the power factor and efficiency of the permanent magnet synchronous generator are improved with MTPA control，and the stability of the system is improved.