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Power Electronic Solution for High Energetic Efficiency of a Thermo Plant

Authors: Aziza Benaboud, Alfred Rufer


In this paper the authors propose a flexible electronic solution, to improve the energetic efficiency of a thermo plant. This is achieved by replacing the mechanical gear box, placed traditionally between a gas turbine and a synchronous generator; by a power electronic converter. After reminding problematic of gear boxes and interest of a proposed electronic solution in high power plants, the authors describe a new control strategy for an indirect frequency converter, which is characterized by its high efficiency due to the use of SWM: Square Wave Modulation. The main advantage of this mode is the quasi absence of switching losses. A control method is also proposed to resolve some problems incurred by using square wave modulation, in particular to reduce the harmonics distortion of the output inverter voltage and current. Simulation examples as well as experimental results are included.

Keywords: Angle shift, high efficiency, indirect converter, gas turbine, NPC three level converter, square wave modulation SWM, switching angle.

Digital Object Identifier (DOI):

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[1] H. Winter and F.Rossig, Entwicklung der Getriebe bei zu erwartenden Leistungssteigerungen Allianz report, no.2, pp. 71-78, 1998.
[2] Highly reliable and efficient turbo gear units, MAAG Gear AG:, 2004.
[3] F. Peneder, R.Lubasch, and A. Voumard, Dispositif statique de demurrage pour centrales de pompage, compensateurs et turbogroupes gaz, Rev. Brown Boveri 440-447, 9/10- 1974.
[4] H. Stemmler, High-power industrial drives, proceeding of the IEEE, vol. 82, Issue 8, 1994, pp 1266-1286.
[5] H. Stemmler, Variable speed, 3 phase drives fed by static frequency changers, state of the art and applications, Brown Boveri, Revue vol 67, issue 1 pp. 55-63, 1980.
[6] C. Schauder, Theory and design of 30-hp matrix converter, IEEE Transactions on industry Applications, vol.28 no 3, pp 546-551, 1992.
[7] A. Schuster, A matrix converter without reactive clamp elements for an induction motor drive system PESC 98 Rec, 29th Annual IEEE 17-22 May 1998, vol.1 pages: 714 720.
[8] S. Turri, Etude dun alternateur desynchronize Thse de Doctorat, U.F.R. des Sciences Techniques et Gestion de lindustrie de lUniversit des Franche-Comte, Belfort, 03.11.2000.
[9] M. Visintin, The active generator principle for high power electric supply: properties and limitations, these EPFL, no. 3324, 2005.
[10] O. Carlson and J. Hylander, Variable speed AC-generators in wind energy converters, MELECON89 Miditerranean, pp. (91-94), 11- 13 April 1989.
[11] M. Dahlgren, Production grande chelle dlectricit dorigine olienne , Revue ABB, pp. 31-37, Mars 2000.
[12] R. H. Baker, High-voltage converter circuit, U.S. Patent 4 203 151, May 13, 1980.
[13] R. H. Baker, Bridge converter circuit, U. S. Patent 4 270 163, May 26, 1981.
[14] A. Nabae, I. Takahashi, and H. Akagi, A neutral-point-clamped PWM inverter, in Conf. Rec. IAS Annu. Meeting, Cincinnati, OH, sep. 28-Oct.3, 1980, vol 3, pp. 761-766.
[15] S. Kourou, J. Rodriguez, B. Wu, S. Bernet and M. Perez, Powering the future of industry, High-power adjustable speed drive topologies, IEEE industry applications magazine 10 May 2012. Volume 18, pp. 26-39.
[16] A. Benaboud, convertisseur de frquence indirect rapport de tension fixe: interface entre turbo-alternateurs haute vitesse et rseau lectrique Thse n3733 EPFL, Lausanne 2007.
[17] H. Bhler, Convertisseurs statiques. Lausanne: presses Polytechniques et Universitaires Romandes, 1991.
[18] ABB stakPak, H Series Press-pack IGBT 5SNR 20H2500, ABB Inustry : brochure and datasheet, Switzerland Ltd, 02 May 2004.
[19] A. Benaboud, A. Rufer A closed loop control strategy for a frequency-only converter with high efficiency , Proceeding of the seventh IASTED international conference, Power and energy systems, august 29-31,2007, palma de Mallorca, Spain. p.p:407- 412.
[20] A. Benaboud, A. Rufer New control strategy for three level NPC converter connected to the grid , proceedings of the Sixth IASTED International Conference, European power and energy systems, June 26-28, 2006, Rhodes, Greece, pp 400-405.
[21] A. Benaboud, A. Rufer Method of controlling a three level converter patent nUS 7,800,926B2 sep.21, 2010.
[22] PLECS, Piece-Wise Linear Electrical Circuit Simulation for simulink. User Manual GmbH, Zrich (ch) 2002, (