A novel method of harmonic assessment generated by three-phase AC-DC converters under unbalanced supply conditions

Rashid, M.H.; Maswood, Ali I.

doi:10.1109/28.6109

Cited by 25 publications

(9 citation statements)

References 6 publications

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“…It is worthwhile underlining that by using proper voltage and current modulation functions it is possible to take into account also supply voltage unbalances [6], [18], [19] and distortion [20]. This is possible without particular difficulties when the unbalances and the distortion are superimposed by external causes.…”

Section: F Considerationsmentioning

confidence: 99%

A New Approach for the Computation of Harmonics and Interharmonics Produced by Line-Commutated AC/DC/AC Converters

Carbone

Rosa

Langella

et al. 2005

IEEE Trans. Power Delivery

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A new approach for modeling line-commutated ac/dc/ac conversion systems is presented and discussed. It is based on the modulation function theory taking advantage of a two-step procedure in which two different models are used. The goal is to achieve a reduction of the computational burden with respect to the time domain models and better modeling accuracy with respect to classical modulation function approaches. The proposed model constitutes an attractive tool inside Monte Carlo simulations for the probabilistic analysis of harmonic and interharmonic distortion. Comparative tests validate the proposed method and demonstrate its computational efficiency and result accuracy.

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Section: F Considerationsmentioning

confidence: 99%

A New Approach for the Computation of Harmonics and Interharmonics Produced by Line-Commutated AC/DC/AC Converters

Carbone

Rosa

Langella

et al. 2005

IEEE Trans. Power Delivery

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“…The latter case can be caused by overhead power transmission lines without transposition or faulty transmission lines, for example. Current converters operated in such unbalanced electrical systems will generally work asymmetrically, which introduces firstly the appearance of non-characteristic harmonics, which causes distortion levels, higher than those in a balanced operation [1,2]. As a high distortion level is always disadvantageous, a method to keep the distortions as low as possible is desirable.…”

Section: Introductionmentioning

confidence: 97%

“…Space-phasor network for conducting state T(1,2,3) According tofig. 2, when T(1,2,3)is finished, the next conducting state is T(2,3).…”

mentioning

confidence: 99%

Investigation of line-commutated three-phase converters with impedance unbalance

Weiland

Herold

Freudenstein

2010

Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference

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Current converters operated in unbalanced electrical three-phase systems will generally work asymmetrically, which causes the appearance of non-characteristic harmonics and therefore higher distortion levels. In this paper unbalances are considered, that are caused by asymmetrical AC-line short-circuit impedances, which are usually a result of unbalanced transmission lines. In the case of thyristor converters one can react on a given unbalance with asymmetrical firing angles. This offers the opportunity to make the converters operation more balanced und to lower the distortion caused by unbalance. This paper deals with the calculation of a current converter's asymmetrical operation and its optimization by use of asymmetrical firing angles.

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“…A novel way of modeling the voltage unbalance by introducing a deviation voltage superimposed on balanced three-phase line voltages was established. Modeling of six pulse rectifier operating under balanced & unbalanced supply conditions has been discussed [9][10]. A time domain model for six pulse rectifier taking into account the system losses, supply impedances, and unbalanced voltage source was developed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of 12-pulse rectifier operation under balanced and unbalanced voltage source with input impedance

Kassas¹

2011

2011 IEEE International Conference on Industrial Technology

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This paper presents a study of modeling and simulation of a twelve-pulse circuit rectifier taking into consideration the effects of the voltage source impedance on the commutation angle for the system operating under a balanced and unbalanced three-phase supply. Three conduction modes are formed in this analysis. Based on the source inductances, the converter conduction modes will change including mode 3 overlap when the angle overlap µ extends beyond 60 o and the number of conducting devices alternate between 3 & 4 devices in each state for both upper and lower bridges. These results are verified using a detail proposed analytical matlab model simulation. Also, the proposed analytical model results are compared to Simulink Powersys Toolbox model results and they are corresponded very well. The analytical method clearly shows the conduction states in all cases which could not identified using the simulink powersys toolbox model.

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A novel method of harmonic assessment generated by three-phase AC-DC converters under unbalanced supply conditions

Cited by 25 publications

References 6 publications

A New Approach for the Computation of Harmonics and Interharmonics Produced by Line-Commutated AC/DC/AC Converters

A New Approach for the Computation of Harmonics and Interharmonics Produced by Line-Commutated AC/DC/AC Converters

Investigation of line-commutated three-phase converters with impedance unbalance

Analysis of 12-pulse rectifier operation under balanced and unbalanced voltage source with input impedance

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