摘要
对斩波式内反馈串级调速系统功率因数低的问题进行分析。将PWM整流器引入内反馈串级调速系统中,代替原有的晶闸管逆变部分,使逆变侧工作在负阻或容性状态,从而提高了系统的功率因数。介绍了采用PWM整流技术的内反馈串级调速系统及其控制策略,最后给出了仿真结果和相应的结论。
The reason was analyzed that the power factor of self-feedback cascade speed control system is poor. A new cascaded speed-adjusting system scheme based on PWM technique was proposed in this paper. SCR was substituted with IGBT in the system. It can provided capacitive reactive power to compensate inductive reactive power which the conventional cascaded speed-adjusting system produced. So it can improve power factor. PWM rectifier and PWM direct current control strategy were introduced in the paper. At last, simulation result and conclusion were given.
出处
《电力科学与工程》
2008年第2期9-12,共4页
Electric Power Science and Engineering
