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Probabilistic models of harmonic currents produced by twelve-pulse AC/DC converters

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2 Author(s)
Ngandui, E. ; Dept. of Electr. & Comput. Eng., Univ. du Quebec, Trois-Rivieres, Que., Canada ; Sicard, P.

The probabilistic approach is an efficient mean for harmonic prediction since it allows to take into account the randomly varying operating conditions of static converters. Although the six-pulse ac/dc converter has been the subject of probabilistic modeling, little consideration has been given to the 12-pulse ac/dc converter. In high-power applications, such as large rated dc power supplies and large rated dc and ac drives, 12-pulse ac/dc converters are usually preferred since they allow to reduce system disturbances due to harmonic currents. This paper presents an analysis of the random properties of harmonic currents produced by 12-pulse ac/dc converters that operate under random variations of their dc load and voltage unbalance. The probability density functions of the amplitudes and phase angles of the harmonic currents (of orders 12 k±1 and 12 k-6±1) are established and validated by results obtained from Monte Carlo simulations.

Published in:

Power Delivery, IEEE Transactions on  (Volume:19 ,  Issue: 4 )

Date of Publication:

Oct. 2004

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