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Dedicated Cutback Control of a Wind Power Plant Based on the Ratio of Command Power to Available Power

  • Thapa, Khagendra ;
  • Yoon, Gihwan ;
  • Lee, Sang Ho ;
  • Suh, Yongsug ;
  • Kang, Yong Cheol
  • Received : 2014.02.22
  • Accepted : 2014.03.15
  • Published : 2014.05.01

Abstract

Cutback control in a grid code is one of the functions of a wind power plant (WPP) that is required to support the system protection and frequency stability. When a cutback control command signal is delivered to the WPP from the system operator, the output of a WPP should be decreased to 20% of the rated power within 5 s. In this paper, we propose a dedicated cutback control algorithm of a WPP based on the ratio of the command power to the available power. If a cutback control signal is delivered, the algorithm determines the pitch angle for the cutback control and starts the pitch angle control. The proposed algorithm keeps the rotor speed at the speed before the start of the cutback control to quickly recover the previous output prior to the cutback control. The performance of the algorithm was validated for a 100 MW aggregated WPP based on a permanent magnet synchronous generator under various wind conditions using an EMTP-RV simulator. The results clearly shows that the proposed algorithm not only successfully reduces the output to the command power within 5 s by minimizing the fluctuation of the pitch angle, but also rapidly recovers to the output level before the cutback control.

Keywords

Cutback control;Pitch angle control;Power coefficient;Rotor speed;Wind power plant

References

  1. J. Machowski, J.W. Bialek, and J.R. Bumby, Power System Dynamics: Stability and Control, 2nd Edition, United Kingdom, John Wiley & Sons, Ltd, 2008.
  2. Global wind energy outlook 2010, Global Wind Energy Council, Oct. 2010.
  3. P. Sorensen, A. D. Hansen, F. lov, F. Blaabjerg, and M.H. Donovan, "Wind farm models and control strategies," Riso National Laboratory, Roskilde, Denmark, 2005.
  4. Global Wind Energy Report: Annual market update 2011, Global Wind Energy Council, Mar. 2012.
  5. M. Tsili, C. Patsiouras, and S. Papathanassiou, "Grid code requirements for large wind farms: A review of technical regulations and available wind turbine technologies," Euro. Wind. Energy. Conference Expo. 2008, pp. 1-11.
  6. E. Fagan, S. Grimes, J. McArdle, P. Smith, and M. Stronge, "Grid code provisions for wind generators in Ireland," IEEE conference on Power Engineering Society General Meeting, 2005, vol. 2, pp. 1241-1247.
  7. Nordic Grid code 2007.
  8. T. Ackermann, Wind Power in Power System, 2nd Edition, England, John Wiley & Sons, Ltd, 2012.
  9. A. D. Margaris, A. D. Hansen, P. Sorensen, and N. K. Hatziargyriou, "Illustration of modern wind turbine ancillary services," Energies, vol. 3, 2010 pp. 1290-1302. https://doi.org/10.3390/en3061290
  10. J. Zhang, M. Cheng, Z. Chen, and X. Fu, "Pitch angle control of variable speed wind turbines," IEEE Conference on Electric Utility Deregulation and Restructuring and Power Technologies, 2008, pp. 2691-2696.
  11. C.C. Le-Ren, and Y. Yao-Ching, "Strategies for operating wind power in a similar manner of conventional power plant," IEEE Trans. on Energy Conversion, vol. 24, no. 4, 2009, pp. 926-934. https://doi.org/10.1109/TEC.2009.2026609
  12. S. Morimoto, H. Nakayama, M. Sanada, and Y. Takeda, "Sensorless output maximization control for variable speed wind generation system using IPMSG," IEEE Trans. on Industry Applications, vol. 41, no. 1, 2005, pp. 60-67. https://doi.org/10.1109/TIA.2004.841159
  13. J. L. Rodriguez-Amenedo, S. Arnalte, and J. C. Burgos, "Automatic generation control of a wind farm with variable speed wind turbines," IEEE Trans. on Energy Conversion, vol. 17, no. 2, pp. 279-284, 2002 https://doi.org/10.1109/TEC.2002.1009481
  14. A. Hwas and R. Kattebi, "Wind turbine control using PI pitch angle controller," IFAC Conference on Advances in PID control, Mar. 28-30, 2012.
  15. S. Heier, Grid integration of wind energy conversion systems, United Kingdom, John Wiley & Sons, Ltd, 2nd Edition, 2006.