skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Load Mitigation on Floating Offshore Wind Turbines with Advanced Controls and Tuned Mass Dampers

Abstract

General Electric, the National Renewable Energy Laboratory (NREL), the University of Massachusetts Amherst (UMass), and Glosten have recently completed a US Department of Energy (DOE)-funded research program to study technologies for mitigating loads on floating offshore wind turbines through the use of advanced turbine controls and tuned mass dampers (TMDs). The analysis was based upon the Glosten PelaStar tension leg platform (TLP) with GE Haliade 150 turbine, a system developed in a previous front end engineering design (FEED) study funded by the Energy Technology Institute (ETI) in the UK. The platform was designed for the WaveHub wave energy research site, with a mean water depth of 59-m. Loads were analyzed by running time-domain simulations in four 50-year return period (50-YRP) ultimate load state (ULS) conditions and 77 fatigue load state (FLS) environmental conditions. In 50-YRP conditions advanced controls are not active. The influence of TMDs on ULS loads have been reported previously (Park et al. [2]). In FLS conditions advanced controls and TMDs afford dramatic reductions in fatigue damage, offering the potential of significant savings in tower structural requirements. Simulations in turbine idling conditions were run in OrcaFlex, and simulations in operating conditions were run in FAST. Simulations were runmore » with a baseline turbine controller, representative of the current state of the art, and an advanced controller developed by NREL to use collective and individual blade pitch control to maintain rotor speed and reduce tower loads. UMass developed a number of TMD types, with varying system configurations, including passive nonlinear dampers and semi-actively controlled dampers with an inverse velocity groundhook control algorithm. Loads and accelerations in FLS conditions were evaluated on the basis of damage equivalent loads (DELs), and fatigue damage was computed by Miner's summations of stress cycles at the tower base. To study sensitivity to water depth, loads were analyzed at both the 59-m WaveHub depth and a more commercially realistic depth of 100 m. TMDs reduce fatigue damage at the tower-column interface flange by up to 52% in 59-m water depth and up to 28% in 100 m water depth. Advanced controls reduce fatigue damage at the tower-column flange by up to 22% in 59-m water depth and up to 40% in 100 m water depth. The most effective load-mitigation strategy is combining advanced controls with TMDs. This strategy affords a 71% reduction in fatigue damage in both 59-m and 100-m water depths.« less

Authors:
 [1];  [1];  [2];  [3]; ORCiD logo [3];  [4];  [4]
  1. Glosten, Inc
  2. GE Renewable Energy
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  4. University of Massachusetts
Publication Date:
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)
OSTI Identifier:
1491370
Report Number(s):
NREL/CP-5000-72116
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the ASME 2018 1st International Offshore Wind Technical Conference, 4-7 November 2018, San Francisco, California
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; offshore wind; wind turbines; tuned mass dampers

Citation Formats

Cross-Whiter, John, Ackers, Benjamin B., Arora, Dhiraj, Wright, Alan D, Fleming, Paul A, Lackner, Matthew, and Park, Semyung. Load Mitigation on Floating Offshore Wind Turbines with Advanced Controls and Tuned Mass Dampers. United States: N. p., 2018. Web. doi:https://dx.doi.org/10.1115/IOWTC2018-1096.
Cross-Whiter, John, Ackers, Benjamin B., Arora, Dhiraj, Wright, Alan D, Fleming, Paul A, Lackner, Matthew, & Park, Semyung. Load Mitigation on Floating Offshore Wind Turbines with Advanced Controls and Tuned Mass Dampers. United States. doi:https://dx.doi.org/10.1115/IOWTC2018-1096.
Cross-Whiter, John, Ackers, Benjamin B., Arora, Dhiraj, Wright, Alan D, Fleming, Paul A, Lackner, Matthew, and Park, Semyung. Wed . "Load Mitigation on Floating Offshore Wind Turbines with Advanced Controls and Tuned Mass Dampers". United States. doi:https://dx.doi.org/10.1115/IOWTC2018-1096.
@article{osti_1491370,
title = {Load Mitigation on Floating Offshore Wind Turbines with Advanced Controls and Tuned Mass Dampers},
author = {Cross-Whiter, John and Ackers, Benjamin B. and Arora, Dhiraj and Wright, Alan D and Fleming, Paul A and Lackner, Matthew and Park, Semyung},
abstractNote = {General Electric, the National Renewable Energy Laboratory (NREL), the University of Massachusetts Amherst (UMass), and Glosten have recently completed a US Department of Energy (DOE)-funded research program to study technologies for mitigating loads on floating offshore wind turbines through the use of advanced turbine controls and tuned mass dampers (TMDs). The analysis was based upon the Glosten PelaStar tension leg platform (TLP) with GE Haliade 150 turbine, a system developed in a previous front end engineering design (FEED) study funded by the Energy Technology Institute (ETI) in the UK. The platform was designed for the WaveHub wave energy research site, with a mean water depth of 59-m. Loads were analyzed by running time-domain simulations in four 50-year return period (50-YRP) ultimate load state (ULS) conditions and 77 fatigue load state (FLS) environmental conditions. In 50-YRP conditions advanced controls are not active. The influence of TMDs on ULS loads have been reported previously (Park et al. [2]). In FLS conditions advanced controls and TMDs afford dramatic reductions in fatigue damage, offering the potential of significant savings in tower structural requirements. Simulations in turbine idling conditions were run in OrcaFlex, and simulations in operating conditions were run in FAST. Simulations were run with a baseline turbine controller, representative of the current state of the art, and an advanced controller developed by NREL to use collective and individual blade pitch control to maintain rotor speed and reduce tower loads. UMass developed a number of TMD types, with varying system configurations, including passive nonlinear dampers and semi-actively controlled dampers with an inverse velocity groundhook control algorithm. Loads and accelerations in FLS conditions were evaluated on the basis of damage equivalent loads (DELs), and fatigue damage was computed by Miner's summations of stress cycles at the tower base. To study sensitivity to water depth, loads were analyzed at both the 59-m WaveHub depth and a more commercially realistic depth of 100 m. TMDs reduce fatigue damage at the tower-column interface flange by up to 52% in 59-m water depth and up to 28% in 100 m water depth. Advanced controls reduce fatigue damage at the tower-column flange by up to 22% in 59-m water depth and up to 40% in 100 m water depth. The most effective load-mitigation strategy is combining advanced controls with TMDs. This strategy affords a 71% reduction in fatigue damage in both 59-m and 100-m water depths.},
doi = {https://dx.doi.org/10.1115/IOWTC2018-1096},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: