Comparison of Two Independent LIDAR-Based Pitch Control Designs

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Description

Two different lidar-based feedforward controllers have previously been designed for the NREL 5 MW wind turbine model under separate studies. Feedforward controller A uses a finite-impulse-response design, with 5 seconds of preview, and three rotating lidar measurements. Feedforward controller B uses a static-gain design, with the preview time defined by the pitch actuator dynamics, a simulation of a real nacelle-based scanning lidar system, and a lowpass filter defined by the lidar configuration. These controllers are now directly compared under the same lidar configuration, in terms of fatigue load reduction, rotor speed regulation, and power capture. The various differences in design ... continued below

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39 p.

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Dunne, F.; Schlipf, D. & Pao, L. Y. August 1, 2012.

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Description

Two different lidar-based feedforward controllers have previously been designed for the NREL 5 MW wind turbine model under separate studies. Feedforward controller A uses a finite-impulse-response design, with 5 seconds of preview, and three rotating lidar measurements. Feedforward controller B uses a static-gain design, with the preview time defined by the pitch actuator dynamics, a simulation of a real nacelle-based scanning lidar system, and a lowpass filter defined by the lidar configuration. These controllers are now directly compared under the same lidar configuration, in terms of fatigue load reduction, rotor speed regulation, and power capture. The various differences in design choices are discussed and compared. We also compare frequency plots of individual pitch feedforward and collective pitch feedforward load reductions, and we see that individual pitch feedforward is effective mainly at the once-per-revolution and twice-per-revolution frequencies. We also explain how to determine the required preview time by breaking it down into separate parts, and we then compare it to the expected preview time available.

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39 p.

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  • Related Information: Work performed by University of Colorado, Boulder, Colorado and University of Stuttgart, Baden-Wurttemberg, Germany

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  • Report No.: NREL/SR-5000-55544
  • Grant Number: AC36-08GO28308
  • DOI: 10.2172/1050139 | External Link
  • Office of Scientific & Technical Information Report Number: 1050139
  • Archival Resource Key: ark:/67531/metadc842821

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  • August 1, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • April 5, 2017, 7:06 p.m.

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Dunne, F.; Schlipf, D. & Pao, L. Y. Comparison of Two Independent LIDAR-Based Pitch Control Designs, report, August 1, 2012; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc842821/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.