Novel four-bridge PWM static VAr compensator

Author

Ji, Yanchao ; Hu, Yongman ; Liu, Zhuo

Author_Institution

Dept. of Electr. Eng., Harbin Inst. of Technol., China

Volume

144

Issue

4

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

249

Lastpage

256

Abstract

A novel four-bridge PWM static VAr compensator is presented. Theoretical analysis shows that the harmonic pairs of [(2k+1)f_s±f] and [(4k+2)f_s±f] generated in each bridge are effectively eliminated through appropriate phase shift control. To satisfy the same 5% total harmonic distortion requirement, this new compensator can work at 200 Hz, which is much lower than the previously reported 1.9 kHz of a single-bridge PWM static VAr compensator. The efficiency is increased and reliability is enhanced. The fairly low switching frequency and multiple-bridge structure facilitate its use in a high-power VAr compensator since a GTO can be employed as the power switch. Theoretical analysis was verified through simulations and experimental results

Keywords

PWM power convertors; bridge circuits; harmonic distortion; power system harmonics; static VAr compensators; switching circuits; thyristor convertors; 200 Hz; GTO; efficiency; four-bridge PWM static VAr compensator; harmonic pairs elimination; multiple-bridge structure; phase shift control; reliability; switching frequency; total harmonic distortion;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:19971059

Filename

612266