基于PWM控制的发电机励磁系统  

PWM-Based Excitation System of Generators

作　　者：贾贵玺[1] 董钺[1] 张臣堂[2] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072 [2]天津电气传动研究所,天津300180

出　　处：《天津大学学报》2005年第10期874-877,共4页Journal of Tianjin University(Science and Technology)

摘　　要：为提高发电机和电力系统的技术指标,将PWM整流技术应用于同步发电机励磁系统,实现了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.利用MATLAB平台对系统进行仿真验证.通过与传统可控硅励磁系统对比,采用IGBT实现的PWM励磁系统性能明显提高.结果表明,本设计改善了发电机机端电压波形,功率因数超过0.99,提高了励磁功率单元利用率,减小了励磁电流超调量,同时对抑制输入电流谐波起到良好的作用.In order to improve the performance of generators and power systems, a pulse width modulation （PWM） rectifier technology was applied to the excitation system of synchronous generators. This method helps to achieve low harmonic current, high power factor transformation in excitation power unit and good quality of generators＇ supply. Simulation about this system by MATLAB was introduced as well. Compared with traditional thyristor excitation system, the PWM excitation system using IGBT improved the performance obviously. The simulation results show that this design can amend the output voltage of generators, with the power factor above 0.99, thus improving adopting efficiency of the power unit, decreasing the overshoot of current, and meanwhile effectively reducing input harmonic current.

关 键 词：脉宽调制 高功率因数 劢磁系统 MATLAB仿真 

分 类 号：TN35[电子电信—物理电子学]