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Journal of Hydrodynamics

, Volume 31, Issue 2, pp 379–388 | Cite as

Pitch control strategy before the rated power for variable speed wind turbines at high altitudes

  • Ming-wei GeEmail author
  • Wei-ming Ke
  • Hong-xia Chen
Articles
  • 16 Downloads

Abstract

The wind turbines in the world’s highest wind farm with an altitude of over 4 000 m in Naqu county of China were put into operation in 2014. Compared with the wind turbines at lower altitudes, the rated wind speed of these wind turbines are much larger, and the corresponding tip-speed ratio at the rated power reduces significantly due to the lower air density. Hence, the power coefficient at the point of the rated power is decreased to a rather low level. To improve the performance of the wind turbines at very high altitudes, this paper proposes a new pitch control strategy for variable speed wind turbines at the constant-speed phase, especially at the rated-speed phase before the rated power is reached. It is shown that the new pitch control strategy works very well for the wind farms at very high altitude and with low air density, with the catch of the wind energy enhanced and the aerodynamic loads significantly reduced.

Key words

Wind turbine pitch control strategy high altitudes 

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Notes

Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (Grant Nos. 2018ZD09, 2017MS022). The authors would like to express their gratitude to the United Power Company for the UP77 wind turbine model.

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Copyright information

© China Ship Scientific Research Center 2018

Authors and Affiliations

  1. 1.School of Renewable EnergyNorth China Electric Power UniversityBeijingChina
  2. 2.School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijingChina

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