A Novel Three Phase to Seven Phase Conversion Technique Using Transformer Winding Connections

M. Tabrez, P. K. Sadhu, A. Iqbal

Abstract


This paper proposes a novel multiphase transformer connection scheme which converts three phase balanced AC input to seven phase balanced AC output. Generalized theory to convert a three phase utility supply into any number of phases is presented. Based on the proposed generalized principle, a three phase to seven phase power converting transformer design is presented with connection scheme, analysis and simulation and experimental results of the proposed three phase to seven phase conversion transformer. The proposed transformer in this paper is analyzed and compared with the connection scheme for seven phase available in the literature. The connection scheme is found to have higher power density, lower core area and lower core requirement as compared to the available connection scheme of the same rating. Impedance mismatching between different phases of the transformer is observed in the three phase to seven phase transformer available in the literature. As this mismatching introduces error in study of per phase equivalent circuit diagrams as well as imbalance in voltage and currents. The present design also addresses the impedance mismatching issue and reduces mismatching in the proposed transformer design. A prototype of the proposed system is developed and waveforms are presented. The proposed design is verified using simulation and validated using experimental approach.


Keywords


multiphase; seven-phase; transformer connections; high phase order

Full Text:

PDF

References


E. Levi, “Multiphase electric machines for variable-speed applications”, IEEE Transactions on Industrial Electronics, Vol. 55, No. 5, pp. 1893–1909 2008

G. K. Singh, K. B. Yadav, R. P. Saini, “Modelling and analysis of multiphase (six-phase) self-excited induction generator”, Proc. 8th Int. Conf. Electr. Mach. Syst., pp. 1922–1927, 2005

G. K. Singh, K. B. Yadav, R. P Sani, “Capacitive self-excitation in six-phase induction generator for small hydro power—An experimental Investigation”, Int. IEEE Conf. Power Electron., Drives Energy Syst., New Delhi, India, pp. 1-6, 2006

J. R. Stewart, D. D. Wilson, “High phase order transmission- a feasibility analysis Part-II-Over voltages and insulation requirements”, IEEE Trans. Power App. Syst., Vol. PAS-97, No. 6, pp. 2308–2317, 1978

S. N. Tewari, G. K. Singh, A. B. Saroor, “Multiphase power transmission research-a survey”, Electric Power Systems Research, Vol. 24, pp. 207–215, 1992

M. Jones, E. Levi, “A literature survey of the state-of-the-art in multi-phase ac drives”, Proc. Int. UPEC, Stafford, U.K., pp. 505–510, 2002

E. Levi, R. Bojoi, F. Profumo, H. A. Toliyat, S. Williamson, “Multiphase induction motor drives-A technology status review”, IET Electric Power Applications, Vol. 1, No. 4, pp. 489–516, 2007

S. Choi, B. S. Lee, P. N. Enjeti, “New 24-pulse diode rectifier systems for utility interface of high power ac motor drives”, IEEE Transactions on Industry Applications, Vol. 33, No. 2, pp. 531–541, 1997

V. Garg, B. Singh, G. Bhuvaneswari, “A tapped star connected autotransformer based 24-Pulse AC-DC converter for power quality improvement in induction motor drives”, International Journal of Emerging Electric Power Systems, Vol. 7, No. 4, 2006

V. Garg, B. Singh, G. Bhuvaneswari, “A 24 pulse AC-DC converter employing a pulse doubling technique for vector controlled induction motor drives”, IETE Journal of Research., Vol. 54, No. 4, pp. 314–322, 2008

B. Singh, S. Gairola, “An autotransformer based 36 pulse controlled AC-DC converter”, IETE Journal of Research, Vol. 54, No. 4, pp. 255–262, 2008

A. Iqbal, S. Moinuddin, M. Rizwan Khan, S. M. Ahmed, H. Abu-Rub, “A novel three-phase to five-phase transformation using a special transformer connection”, IEEE Transactions on Power Delivery Vol. 25, No. 3, pp. 1637–1644, 2010

S. Moinoddin, A. Iqbal, H. Abu-Rub, M. Rizwan Khan, S. Moin Ahmed, “Three-Phase to Seven-Phase Power Converting Transformer”, IEEE Transactions on Energy Conversion, Vol. 27, No. 3, pp. 757-766, 2012

A. S. Abdel-Khalik, Z. Shafik, A. Elserougi, S. Ahmed, A. Massouda, “A static three-phase to five-phase transformer based on Scott connection”, Electric Power Systems Research, Vol. 110, pp. 84–93, 2014

J. E. Parton, “A general theory of phase transformation”, Proceedings of the IEE - Part IV: Institution Monographs, Vol. 99, No. 2, pp. 12-23, 1952.

O. E. Gouda, G. M. Amer, W. A. A. Salem, “A study of K-Factor Power Transformer Characteristics by Modelling Simulation”, Engineering, Technology & Applied Science Research Vol. 1, No. 5, pp. 114-120, 2011

H. Fan, J. Hu, H. Liu, Y. Yin, M. Danikas, “UHF PD Experiments on Real Power Transformer and its Frequency Characteristics Results”, Engineering, Technology & Applied Science Research Vol. 6, No. 1, pp. 906-912, 2016




eISSN: 1792-8036     pISSN: 2241-4487