摘要
在提高常规串级凋速装置的功率因数的基础上,研究了能降低逆变电流中谐波成分的逆变控制方案。使用GTO代替常规逆变器中的可控硅,借助次谐波PWM技术选择最佳开关点,并使逆变器触发角a基180°-270°内变化,则能抑制逆变器的谐波电流,还能提高逆变器的功率因数。这套装置用于串级调速的实验表明:电流超前型的功率因数比滞后型的有明显提高,逆变电流中低次谐波大大减少。
The paper discusses the strategy of reducing the harmonic currents of the inverter on the base of improving the power factor of conventional static scherbius drives. Not only the harmonic currents of inverter has been suppressed, but also the power factor of inverter has been improved with the aid of subharmonic PWM techniques for deter-mining optimal switching angles and making firing angle a vary between 180° and 270° using GTO thyristor instead of normal thyristor in inverter. The scherbius drive experiments employing the new inverter show that the power factor of leading current type is much higher than lagging current type and the lower order harmonic currents of the inverter have been grertly reduced. The structure and the control of the equipment is very simple.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1990年第5期462-466,共5页
Journal of University of Science and Technology Beijing
关键词
串级调速
GTO逆变器
谐波抑制
power factor, scherbius drive, GTO-thyristor, PWM, harmonics
