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 GTO can be employed as the power switch. Theoretical analysis was verified through simulations and experimental results.
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http://iet.metastore.ingenta.com/content/journals/10.1049/ip-epa_19971059
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