PWM-controlled series compensation with low harmonic distortion

被引:8
作者
Chu, KH [1 ]
Pollock, C [1 ]
机构
[1] Univ Warwick, Dept Engn, Coventry CV4 7AL, W Midlands, England
关键词
harmonic distortion; PWM-controlled series compensator;
D O I
10.1049/ip-gtd:19971537
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The paper describes a pulse width modulation (PWM)-controlled series compensator with continuously variable reactance, employing simple PWM duty ratio control. Each phase of the compensator comprises a switched reactor and parallel capacitor. The duty ratio control gives a wide range of capacitive and inductive compensation. The harmonics created by the switched reactor have been analysed. The switched reactor and parallel capacitor have been simulated with a range of switching frequencies and duty ratios. With appropriate choice of capacitor and reactor, a scaled-down experimental model of the compensator has been simulated and constructed. The harmonics have been found to be small even with the switching frequency of the controlled turn-off switches as low as 400 Hz. A large step change in duty ratio from maximum capacitive compensation to inductive compensation shows the rapid dynamic response of the compensator with a fast settling time. This demonstrates that the proposed compensator should be considered as another useful FACTS controller for series compensation.
引用
收藏
页码:555 / 563
页数:9
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