优良的励磁控制系统不仅可以保证发电机运行的可靠性和稳定性，而且可有效地提髙发电机和电力系统技术指标。同步发电机励磁系统采用了PWM整流技术，实现励磁电流低谐波和励磁功率单元高功率因数转换，提高了发电机供电质量，并用MATLAB对设计系统做出仿真验证，证明该设计对改善发电机输出电压、提高功率单元电能利用率有明显效果。

A high quality excitation system not only plays an important role in the stability of power system but also can improve the performance of generators and power system. In this paper, a PWM rectifier is applied to excitation system of synchronous generators. It improves the quality of generator’s supply by achieving low harmonic current conversion and improving high power factor transform of excitation unit. Simulation results about design system through MATLAB are presented to show the obvious effect on the inprovement of the output of generator and increase of adopting efficiency power unit.