DC harmonic distortion minimization of thyristor converters under unbalanced voltage supply using asymmetrical firing angle

Journal Article · Sat Mar 01 04:00:00 EST 1997 · IEEE Transactions on Power Electronics

DOI:https://doi.org/10.1109/63.558756· OSTI ID:490907

Ngandui, E; Olivier, G; April, G E; Guimaraes, C ^[1]

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1. Ecole Polytechnique de Montreal, Quebec (Canada). Dept. of Electrical and Computer Engineering

Noncharacteristic harmonics of significant magnitude are produced at the output and input terminals of phase-controlled converters under unbalanced voltage supply conditions. The concept of switching functions has been proposed before to evaluate harmonics produced by a phase-controlled six-pulse converter under both balanced and unbalanced power supply conditions. This paper extends the switching-functions approach to establish analytical equations for the dc output voltage harmonics produced by 12-, 18-, and 24-pulse converters. The problem is approached from the standpoint of symmetrical voltage components. The increase in distortion under unbalance is caused by the appearance of a second harmonic component. A method, based on an asymmetrical firing angle, to cancel the second harmonic at the converter output under unbalanced voltage supply is also presented. Cancellation of the second harmonic improves converter dc output voltage quality.

• OSTI ID: 490907
• Journal Information: IEEE Transactions on Power Electronics, Journal Name: IEEE Transactions on Power Electronics Journal Issue: 2 Vol. 12; ISSN ITPEE8; ISSN 0885-8993
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRIC POWER
HARMONICS
MINIMIZATION
QUALITY CONTROL
RECTIFIERS
THYRISTORS