skip to main content


Title: Field testing of linear individual pitch control on the two-bladed controls advanced research turbine

This paper presents the results of field tests using linear individual pitch control (LIPC) on the two-bladed Controls Advanced Research Turbine 2 (CART2) at the National Renewable Energy Laboratory (NREL). LIPC has recently been introduced as an alternative to the conventional individual pitch control (IPC) strategy for two-bladed wind turbines. The main advantage of LIPC over conventional IPC is that it requires, at most, only two feedback loops to potentially reduce the periodic blade loads. In previous work, LIPC was designed to implement blade pitch angles at a fixed frequency (e.g., the once-per-revolution (1P) frequency), which made it only applicable in above-rated wind turbine operating conditions. In this study, LIPC is extended to below-rated operating conditions by gain scheduling the controller on the rotor speed. With this extension, LIPC and conventional IPC are successfully applied to the NREL CART2 wind turbine. Lastly, the field-test results obtained during the measurement campaign indicate that LIPC significantly reduces the wind turbine loads for both below-rated and above-rated operation.
 [1] ;  [2] ;  [2] ;  [1]
  1. Delft Univ. of Technology (Netherlands). Delft Center for Systems and Control
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States). National Wind Technology Center
Publication Date:
Report Number(s):
Journal ID: ISSN 1095-4244
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Wind Energy
Additional Journal Information:
Journal Volume: 19; Journal Issue: 3; Journal ID: ISSN 1095-4244
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Country of Publication:
United States
17 WIND ENERGY; linear individual pitch control; two-bladed wind turbines; load reduction; field testing; experimental validation; NREL CART2
OSTI Identifier: