A new control strategy to improve the performance of a PWM ac to dc converter under unbalanced operating conditions

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · IEEE Transactions on Power Electronics

DOI:https://doi.org/10.1109/63.261020· OSTI ID:143877

Enjeti, P N; Choudhury, S A ^[1]

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1. Texas A and M Univ., College Station, TX (United States). Dept. of Electrical Engineering

Abnormal harmonics of significant magnitude are generated at the output and input terminals of a PWM ac to dc converter under unbalanced operating conditions. A new control strategy is presented here to selectively cancel the generated lower order abnormal harmonics at the output and input terminals and thereby to preserve the high performance features of a PWM ac to dc converter. The proposed technique essentially involves computing the sequence components of the unbalanced input supply and suitably counter-unbalances the PWM gating signals of the converter switches to cancel the generated abnormal harmonics. The technique is essentially a feed forward approach and is suitable for higher power G.T.O. type PWM ac to dc converters. A procedure for implementing this technique in real time is discussed. Finally selected results are verified experimentally on a prototype PWM ac to dc converter.

• OSTI ID: 143877
• Journal Information: IEEE Transactions on Power Electronics, Journal Name: IEEE Transactions on Power Electronics Journal Issue: 4 Vol. 8; ISSN ITPEE8; ISSN 0885-8993
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CONTROL THEORY
PERFORMANCE
POWER CONDITIONING CIRCUITS
POWER SUPPLIES
SEMICONDUCTOR RECTIFIERS