Article metrics

  • citations in SCindeks: [1]
  • citations in CrossRef:[1]
  • citations in Google Scholar:[=>]
  • visits in previous 30 days:3
  • full-text downloads in 30 days:2
article: 3 from 5  
Back back to result list
Zbornik radova, Elektrotehnički institut "Nikola Tesla"
2015, iss. 25, pp. 1-30
article language: Serbian
document type: Original Scientific Paper
published on: 05/01/2016
doi: 10.5937/zeint25-9150
Influence of interphase transformers and ac line reactances on the thyristor bridges' current sharing in 18-pulse rectifiers
University of Belgrade, Electrical Engineering Institute 'Nikola Tesla'

e-mail: vladimir.vukic@ieent.org

Project

Energy efficiency Improvement of Hydro and Thermal power plants in EPS by development and implementation of power electronics based regulation and automation equipment (MESTD - 33020)

Abstract

In this paper, computer simulation models of two different topologies of 18-pulse rectifiers are presented. Each rectifier topology consists of three parallel, three-phase six-pulse full-bridge thyristor converters connected via interphase transformers. The influence of the interphase transformer's layout and AC line reactances variations on the particular thyristor converter current sharing is analysed. Various configurations of 18-pulse rectifiers are examined by simulating operation with symmetric input voltage supply, as well as in the cases of different levels of voltage supply asymmetry, at unequal input conductors impedance, and at different thyristor voltage drops. According to computer simulation results, an optimal 18-pulse rectifier circuit topology is recommended. The optimal topology has three AC line reactances with two input current-balancing interphase transformers. These added AC reactances are also involved with the current commutation process between thyristors. Application of the recommended optimal topology of an 18-pulse rectifier could enable the reduction of the AC line reactances number from nine to three, while the dissipated power of the AC/DC converter's most loaded thyristor could be reduced by approximately 11 %. During the simulation of the nominally loaded 18-pulse rectifier, in all considered cases the effective value of the output signal ripple below one promil of total current and voltage values has been achieved.

Keywords

18-pulse rectifier; parallel thyristor bridges; interphase transformer; AC line reactance; current sharing; computer simulation

References

*** (2015) Allen-Bradley PowerFlex® medium voltage AC drives. Rockwell Automation Inc, Katalog proizvođača
*** (2012) MGE® Galaxy® 9000: Three phase UPS - 800/900 kVA. Schneider Electric Co, Katalog proizvođača
*** (2005) Power electronics: Discrete diode/Thyristor chips. Semikron International GmbH, Katalog proizvođača
*** (2015) Napojni kablovi / Power cables. Elektrometal plus, Katalog proizvođača
*** (2003) PSIM version 6.0. Powersim Inc, Simulacioni program
Åström, K.J., Wittenmark, B. (1997) Computer-Controlled Systems - Theory and Design. New Jersey: Prentice Hall, 3rd ed
Bordry, F., Montabonnet, V., Thiesen, H., Kniegl, G., Pauls, R., Wolfes, B. (2001) Soft switching (ZVZCS) high current, low voltage modular power converter (13 kA, 16 V). in: 9th European Conference on Power Electronics and Applications, Grac, Austrija, 27.-29. avgust 2001, str. 1-9
Katić, V. (2002) Kvalitet električne energije - viši harmonici. Novi Sad: Fakultet tehničkih nauka
Ladoux, P., Postiglione, G., Foch, H., Nuns, J.A. (2005) A Comparative Study of AC/DC Converters for High-Power DC Arc Furnace. IEEE Transactions on Industrial Electronics, 52(3): 747-757
Mohan, N., Undeland, T.M., Robbins, W.P. (1995) Power Electronics - Converters, Applications, and Design. New York: John Wiley & Sons, 2nd ed
Paice, D.A. (1996) Power electronic converter harmonics: Multipulse methods for clean power. Piscataway, NJ: IEEE Press
Perreault, D.J., Kassakian, J.G. (1995) Effects of firing angle imbalance on 12-pulse rectifiers with interphase transformers. IEEE Transactions on Power Electronics, 10(3): 257-262
Pinto, S.F., Silva, J.F.A. (1999) Constant-frequency sliding-mode and PI linear controllers for power rectifiers: a comparison. IEEE Transactions on Industrial Electronics, 46(1): 39-51
Rodriguez, J.R., Pontt, J., Silva, C., Wiechmann, E.P., Hammond, P.W., Santucci, F.W., Alvarez, R., Musalem, R., Kouro, S., Large, L.P. (2005) Large Current Rectifiers: State of the Art and Future Trends. IEEE Transactions on Industrial Electronics, 52(3): 738-746
Schanen, J.L., Guichon, J.M., Roudet, J., Domenech, C. (2010) Impact of the Physical Layout of High-Current Rectifiers on Current Division and Magnetic Field Using PEEC Method. IEEE Transactions on Industry Applications, 46(2): 892-900
Tanaka, T., Ogasawara, S., Akagi, Y., Nabae, A. (1990) Current balance of phase-controlled thyristor converter with interphase reactors. Electrical Engineering in Japan, 110(4): 83-91
Vukić, V. (2011) Tiristorski ispravljači sa digitalnim regulatorima zasnovanim na mikrokontroleru 80C196 za sisteme besprekidnog napajanja. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 21, str. 139-155
Vukić, V., Janković, M., Prole, R. (2004) Mikroprocesorsko upravljanje dvanaesto-pulsnim rednim tiristorskim mostom. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 16, str. 61-67
Vukić, V. (2011) Energetska efikasnost i digitalna komunikacija fazno regulisanih ispravljača za industrijske sisteme besprekidnog napajanja. Poljoprivredna tehnika, vol. 36, br. 3, str. 19-28
Vukić, V.Đ. (2013) Mrežom komutovani fazno regulisani ispravljači sa adaptivnim digitalnim regulatorima. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 23, str. 1-18