Performance of Double Fed Induction Machine at Sub- and Super-Synchronous Speed in Wind Energy Conversion System

  • Published : 2009.06.20

Abstract

In this paper two modes of operating a wound rotor induction machine as a generator at sub-and super-synchronous speeds in wind energy conversion systems are investigated. In the first mode, known as double fed induction generator (DFIG), the rotor circuit is fed from the ac mains via a controlled rectifier and a forced commutated inverter. Adjusting the applied rotor voltage magnitude and phase leads to machine operation as a generator at sub-synchronous speeds. In the second mode, the machine is operated in a slip recovery scheme where the slip energy is fed back to the ac mains via a rectifier and line commutated inverter. This mode is described as double output induction generator (DOIG) leading to increase the efficiency of the wind-to electrical energy conversion system. Simulated results of both modes are presented. Experimental verification of the simulated results are presented for the DOIG mode of operation, showing larger amount of power captured and better power factor when compared to conventional induction generators.

References

  1. Thresher R., Robinson, and Veers P., "The Capture of Wind, The Status and Future of Wind energy Technology," IEEE on Power and Energy, Vol. 5, No.6, pp. 34-46, 2007
  2. Garin l. Mundate A.,lpeuz, S., and Bordonau J., "Low and Medium Voltage Wind Energy Conversion Systems: Generator Overview and Grid Connection requirements," in proc. of 19th International Conference on Electricity Distribution, pp. 21-24, 2007
  3. S. K Salman and Babak Badrzadeh, "New Approach for modelling Doubly-Fed Induction Generator (DFIG) for GridConnection Studies," in Conf Rec. IEEE. Power Engineering Summer Meeting. 2001
  4. Erlich I., Wilch M., and Feltes C., "Reactive Power Generation by DFIG Based Wind Farms with AC Grid Connection," in proc. of EPE conference, pp.1-10, 2007
  5. Fadaeinedjad R., Moallem M., and Moschopoulos G., "Simulation of a Wind Turbine with Doubly Fed Induction Generator by FAST and Simulink," IEEE Trans. On Energy Conversion, Vol. 23, No.2, pp.690-700, 2008 https://doi.org/10.1109/TEC.2007.914307
  6. Sedighizadeh M., and Rezazzdeh A., "Harmonic Analysis and Performance Improvement of a Wind Energy Conversion System with Double Output Induction Generator," in Proc. of the World Academy of Science and Technology, Vol.27, pp.246-250, 2008
  7. Saleh, M.A., Issawi A.M., and Iskander M.N., "Double Excited Induction Generators Operating with WECS," in Proc. of The International Conference on Electrical Machines, pp.1064-1067, 1984