Analysis of parallel operation of converters with interphase transformer

The parallel operation of two three-pulse controlled converters with interphase transformer (IPT) is modeled and analyzed. An IPT absorbs voltage difference between DC voltages of the two converters at any instant and ensures independent operation without any circulating current. It also results in six-pulse output voltage resulting in less harmonic distortions. The complete circuit is solved by using modified nodal analysis (MNA) and magnetic nonlinearity in the IPT core is taken into account by dynamic inductance model. Power electronic switches are modeled as small and large resistances during ON and OFF states. A code has been written to model and simulate the circuit under balanced and short circuit conditions.

[1]  Kuniomi Oguchi,et al.  Multilevel current-source and voltage-source converter systems coupled with harmonic canceling reactors , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[2]  I. Park,et al.  Modeling and analysis of multi-interphase transformers for connecting power converters in parallel , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[3]  F. P. Dawson,et al.  DC-DC converter interphase transformer design considerations: volt-seconds balancing , 1990 .

[4]  Tore Undeland,et al.  Power Electronics: Converters, Applications and Design , 1989 .

[5]  Jian-Ming Jin,et al.  The Finite Element Method in Electromagnetics , 1993 .

[6]  A. Arkkio,et al.  Inductance model for coupling finite element analysis with circuit Simulation , 2005, IEEE Transactions on Magnetics.

[7]  Andrew Cross,et al.  Modelling, simulation and validation of a twelve-pulse autotransformer rectifier for aerospace applications , 2004 .

[8]  S. J. Salon,et al.  Numerical Methods in Electromagnetism , 1999 .

[9]  Adel Razek,et al.  Coupling of saturated electromagnetic systems to non-linear power electronic devices , 1988 .

[10]  S. A. Khaparde,et al.  Transformer Engineering: Design and Practice , 2004 .

[11]  L.J.J. Offringa,et al.  A 1600 kW IGBT converter with interphase transformer for high speed gas turbine power plants , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[12]  David J. Perreault,et al.  Effects of firing angle imbalance on 12-pulse rectifiers with interphase transformers , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[13]  K. J. Binns,et al.  Analysis and computation of electric and magnetic field problems , 1973 .

[14]  J. Brauer.  Simple equations for the magnetization and reluctivity curves of steel , 1975 .

[15]  Johannes Schaefer,et al.  Rectifier circuits : theory and design , 1965 .