Influence of Control on the Pitch Damping of a Floating Wind Turbine

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132 Scopus Citations

Abstract

This paper presents the influence of conventional wind turbine blade-pitch control actions on the pitch damping of a wind turbine supported by an offshore floating barge with catenary moorings. There was a concern that the drop in steady-state wind turbine rotor thrust with wind speed above rated would lead to negative damping of the barge-pitch mode and contribute to the large system-pitch motions. It is demonstrated that neither the addition of a control loop through feedback of tower-top acceleration nor the modification to pitch-to-stall rotor-speed regulation satisfactorily improved the barge-pitch response. The latter modification helped conclude, however, that the actual barge-pitch damping was considerably greater than that implied by the steady-state rotor thrust response, but that it was still beneficial to increase the damping as much as possible. Detuning the gains in the baseline blade-pitch-to-feather controller helped, but still did not entirely resolve the barge-pitch-motion problem.

Original languageAmerican English
Number of pages18
DOIs
StatePublished - 2008
Event2008 ASME Wind Energy Symposium - Reno, Nevada
Duration: 7 Jan 200810 Jan 2008

Conference

Conference2008 ASME Wind Energy Symposium
CityReno, Nevada
Period7/01/0810/01/08

NREL Publication Number

  • NREL/CP-500-42589

Keywords

  • blade pitch control
  • floating wind turbine platform
  • offshore wind energy
  • wind energy
  • wind turbine

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