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Novel four-bridge PWM static VAr compensator

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3 Author(s)
Yanchao Ji ; Dept. of Electr. Eng., Harbin Inst. of Technol., China ; Yongxuan Hu ; Zhuo Liu

A novel four-bridge PWM static VAr compensator is presented. Theoretical analysis shows that the harmonic pairs of [(2k+1)fs ±f] and [(4k+2)fs±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

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:144 ,  Issue: 4 )