The doctoral dissertations of the former Helsinki University of Technology (TKK) and Aalto University Schools of Technology (CHEM, ELEC, ENG, SCI) published in electronic format are available in the electronic publications archive of Aalto University - Aaltodoc.
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Transient Performance Analysis of Wind-Power Induction Generators

Slavomir Seman

Dissertation for the degree of Doctor of Science in Technology to be presented with due permission of the Department of Electrical and Communications Engineering for public examination and debate in Auditorium S1 at Helsinki University of Technology (Espoo, Finland) on the 10th of November, 2006, at 12 noon.

Overview in PDF format (ISBN 951-22-8423-5)   [1774 KB]
Dissertation is also available in print (ISBN 951-22-8422-7)

Abstract

A coupled field-circuit simulator for the transient analysis of wind energy conversion systems with a doubly fed induction generator (DFIG) was developed and experimentally validated. Short-term grid disturbance and ride-through analyses were carried out for a 1.7-MW DFIG wind-power conversion system. Two simulation models of the wind-power DFIG were compared to reveal the consequences of the different modeling approaches for the accuracy of transient analysis. The DFIG was represented in the simulator by an analytical two-axis model with constant lumped parameters or by a finite element method-based model. The model of the generator was coupled with a model of the crowbar-protected and direct torque-controlled frequency converter, a model of the main transformer, and a simple model of the grid. In addition, a detailed model of the wind turbine was compared with a simplified model that omits the model of the mechanical part of the wind turbine. The simulator was experimentally validated by a 1.7-MW full-scale measurement set-up. The comparison between the simulated and measured results shows reasonable agreement. The analytical model of the DFIG, however, manifests certain drawbacks that are overcome by using a FEM model. The developed coupled field circuit-based simulator has proved to be capable and reliable for modeling of complicated power electronics and electrical machine set-ups and thus is a useful tool for the development and optimization of wind-power generators.

This thesis consists of an overview and of the following 6 publications:

  1. Seman, S., Niiranen, J., Kanerva, S., Arkkio, A. 2004. Analysis of a 1.7 MVA Doubly Fed Wind-Power Induction Generator during Power Systems Disturbances. Proceedings of the Nordic Workshop on Power and Industrial Electronics (NORPIE 2004), 14-16 June 2004, Trondheim, Norway, 6 p., CD-ROM. © 2004 by authors.
  2. Seman, S., Kanerva, S., Niiranen, J., Arkkio, A. 2004. Transient Analysis of Wind Power Doubly Fed Induction Generator Using Coupled Field-Circuit Model. Proceedings of the 16th International Conference on Electrical Machines (ICEM 2004), 5-8 September 2004, Cracow, Poland, 6 p., CD-ROM. © 2004 by authors.
  3. Kanerva, S., Seman, S., Arkkio, A. 2005. Inductance Model for Coupling Finite Element Analysis with Circuit Simulation. IEEE Transactions on Magnetics, Vol. 41, Issue 5, May 2005, pp. 1620-1623. © 2005 IEEE. By permission.
  4. Seman, S., Niiranen, J., Kanerva, S., Arkkio, A., Saitz, J. 2006. Performance Study of a Doubly Fed Wind-Power Induction Generator under Network Disturbances. IEEE Transactions on Energy Conversion, accepted for future publication, 8 p. © 2006 IEEE. By permission.
  5. Seman, S., Iov, F., Niiranen, J., Arkkio, A. 2006. Comparison of Simulators for Variable-Speed Wind Turbine Transient Analysis. International Journal of Energy Research, Vol. 30, Issue 9, pp. 713-728. © 2006 John Wiley & Sons. By permission.
  6. Seman, S., Niiranen, J., Arkkio, A. 2006. Ride-Through Analysis of Doubly Fed Induction Wind-Power Generator under Unsymmetrical Network Disturbance. IEEE Transactions on Power Systems, accepted for future publication, 7 p. © 2006 IEEE. By permission.

Keywords: coupled simulator, crowbar, doubly fed induction generator, transient analysis, ride-through, wind turbine

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© 2006 Helsinki University of Technology

Last update 2011-05-26