Journal
WIND ENERGY
Volume 19, Issue 3, Pages 421-436Publisher
WILEY
DOI: 10.1002/we.1841
Keywords
(linear) individual pitch control; two-bladed wind turbines; load reduction; field testing; experimental validation; NREL CART2
Categories
Funding
- Far and Large Offshore Wind (FLOW) program [91071]
- NWO Veni Grant [11930]
- US Department of Energy [DE-AC36-08GO28308]
- National Renewable Energy Laboratory
- DOE Office of Energy Efficiency and Renewable Energy, Wind and Water Power Technologies Office
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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. 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. Copyright (c) 2015 John Wiley & Sons, Ltd.
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