Alan Wright
YOU?
Author Swipe
View article: The NREL teetering hub rotor code: Final results and conclusions
The NREL teetering hub rotor code: Final results and conclusions Open
Accurately predicting wind turbine blade loads and response is important for the proper design of wind turbines. The need to accurately predict both deterministic and stochastic blade loads is now widely recognized. Previous rotor code dev…
View article: Wind/Wave Testing of a 1:70-Scale Performance-Matched Model of the IEA Wind 15 MW Reference Wind Turbine with Real-Time ROSCO Control and Floating Feedback
Wind/Wave Testing of a 1:70-Scale Performance-Matched Model of the IEA Wind 15 MW Reference Wind Turbine with Real-Time ROSCO Control and Floating Feedback Open
Experimental results from the Floating Offshore-wind and Controls Advanced Laboratory (FOCAL) experimental program, which tested a performance-matched model of the IEA Wind 15 MW Reference Turbine on a 1:70 scale floating semisubmersible p…
View article: 1:70-Scale Model Testing of the Reference OpenSource Controller (ROSCO) on the IEA-Wind 15MW Reference Wind Turbine Including Floating Feedback: Preprint
1:70-Scale Model Testing of the Reference OpenSource Controller (ROSCO) on the IEA-Wind 15MW Reference Wind Turbine Including Floating Feedback: Preprint Open
This paper presents results from the Floating Offshore-wind Controls Advanced Laboratory (FOCAL) Experimental campaign performed at the University of Maine's (UMaine's) Harold Alfond Wind/Wave Ocean Engineering Laboratory (W2). The project…
View article: Development of a wind turbine model and simulation platform using an acausal approach: Multiphysics modeling, validation, and control
Development of a wind turbine model and simulation platform using an acausal approach: Multiphysics modeling, validation, and control Open
This article presents the development of the Control‐oriented, Reconfigurable, and Acausal Floating Turbine Simulator (CRAFTS). CRAFTS has a modular, hierarchical model architecture that enables rapid and accurate simulation of wind turbin…
View article: Verification and Validation of Model-Scale Turbine Performance and Control Strategies for the IEA Wind 15 MW Reference Wind Turbine
Verification and Validation of Model-Scale Turbine Performance and Control Strategies for the IEA Wind 15 MW Reference Wind Turbine Open
To enable the fast growth of the floating offshore wind industry, simulation models must be validated with experimental data. Floating wind model-scale experiments in wind–wave facilities have been performed over the last two decades with …
View article: Results from the FOCAL experiment campaign 1: turbine control co-design
Results from the FOCAL experiment campaign 1: turbine control co-design Open
This paper summarizes the scaling approach and results from the first experimental campaign of the Floating Offshore-wind and Controls Advanced Laboratory (FOCAL) Experimental Program, which is focused on developing public data sets to sup…
View article: Floating wind turbine control optimization
Floating wind turbine control optimization Open
We present a framework for optimizing the control parameters of floating offshore wind turbines (FOWTs). The framework combines aeroelastic simulations with a systems engineering model and control software. In an example of the optimizatio…
View article: A reference open-source controller for fixed and floating offshore wind turbines
A reference open-source controller for fixed and floating offshore wind turbines Open
This paper describes the development of a new reference controller framework for fixed and floating offshore wind turbines that greatly facilitates controller tuning and represents standard industry practices. The reference wind turbine co…
View article: Comment on wes-2021-19
Comment on wes-2021-19 Open
Abstract. This paper describes the development of a new reference controller framework for fixed and floating offshore wind turbines that greatly facilitates controller tuning and represents standard industry practices. The reference wind …
View article: Comment on wes-2021-19
Comment on wes-2021-19 Open
Abstract. This paper describes the development of a new reference controller framework for fixed and floating offshore wind turbines that greatly facilitates controller tuning and represents standard industry practices. The reference wind …
View article: A Reference Open-Source Controller for Fixed and Floating Offshore Wind Turbines
A Reference Open-Source Controller for Fixed and Floating Offshore Wind Turbines Open
This paper describes the development of a new reference controller framework for fixed and floating offshore wind turbines that greatly facilitates controller tuning and represents standard industry practices. The reference wind turbine co…
View article: Tuning of Nacelle Feedback Gains for Floating Wind Turbine Controllers Using a Two-DOF Model
Tuning of Nacelle Feedback Gains for Floating Wind Turbine Controllers Using a Two-DOF Model Open
Designing a collective blade pitch controller for floating offshore wind turbines (FOWTs) poses unique challenges due to the interaction of the controller with the dynamics of the platform. The controller must also handle the competing obj…
View article: An Update to the NREL Baseline Wind Turbine Controller: Preprint
An Update to the NREL Baseline Wind Turbine Controller: Preprint Open
The NREL 5MW wind turbine model is well established as an industry standard and is often used as a comparison model, or a model on which to build upon. Though effective, the legacy controller for the NREL 5MW wind turbine is built on a sim…
View article: An Update to the National Renewable Energy Laboratory Baseline Wind Turbine Controller
An Update to the National Renewable Energy Laboratory Baseline Wind Turbine Controller Open
The National Renewable Energy Laboratory’s 5-MW wind turbine model is well established as an industry standard and is often used as a comparison model, or a model on which to build upon. Though effective, the legacy controller for the 5-MW…
View article: Comparing State-Space Multivariable Controls to Multi-SISO Controls for Load Reduction of Drivetrain-Coupled Modes on Wind Turbines through Field-Testing: Preprint
Comparing State-Space Multivariable Controls to Multi-SISO Controls for Load Reduction of Drivetrain-Coupled Modes on Wind Turbines through Field-Testing: Preprint Open
This paper presents the structure of an ongoing controller comparison experiment at NREL's National Wind Technology Center; the design process for the two controllers compared in this phase of the experiment, and initial comparison results…
View article: Submerged Pressure Differential Plate Wave Energy Converter with Variable Geometry: Preprint
Submerged Pressure Differential Plate Wave Energy Converter with Variable Geometry: Preprint Open
This work presents a novel wave energy converter device concept that combines a submerged pressure differential plate with variable geometry modules. The two variable geometry sections, placed at the force and aft locations on the plate, c…
View article: Verification of Floating Offshore Wind Linearization Functionality in OpenFAST
Verification of Floating Offshore Wind Linearization Functionality in OpenFAST Open
The wind engineering community relies on multiphysics engineering software to run nonlinear time-domain simulations, e.g., for design standards-based loads analysis. Although most physics involved in wind energy are nonlinear, linearizatio…
View article: Full-System Linearization for Floating Offshore Wind Turbines in OpenFAST: Preprint
Full-System Linearization for Floating Offshore Wind Turbines in OpenFAST: Preprint Open
The wind engineering community relies on multiphysics engineering software to run nonlinear time-domain simulations, e.g. for design-standards-based loads analysis. Although most physics involved in wind energy are nonlinear, linearization…
View article: Load Mitigation on Floating Offshore Wind Turbines With Advanced Controls and Tuned Mass Dampers
Load Mitigation on Floating Offshore Wind Turbines With Advanced Controls and Tuned Mass Dampers Open
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 mitig…
View article: Balancing Power Absorption Against Structural Loads With Viscous Drag and Power-Takeoff Efficiency Considerations
Balancing Power Absorption Against Structural Loads With Viscous Drag and Power-Takeoff Efficiency Considerations Open
The focus of this paper is to balance power absorption against structural loading for a novel fixed-bottom oscillating surge wave energy converter in both regular and irregular wave environments. The power-to-load ratio will be evaluated u…
View article: Prediction of stochastic blade loads for three-bladed, rigid-hub rotors
Prediction of stochastic blade loads for three-bladed, rigid-hub rotors Open
Accurately predicting wind turbine blade loads and response is important for the design of future wind turbines. The need to include turbulent wind inputs in structural dynamics models is widely recognized. In this paper, the Force and Loa…
View article: Balancing Power Absorption and Structural Loading for a Novel Fixed-Bottom Wave Energy Converter with Nonideal Power Take-Off in Regular Waves: Preprint
Balancing Power Absorption and Structural Loading for a Novel Fixed-Bottom Wave Energy Converter with Nonideal Power Take-Off in Regular Waves: Preprint Open
In this work, the net power delivered to the grid from a nonideal power take-off (PTO) is introduced followed by a review of the pseudo-spectral control theory. A power-to-load ratio, used to evaluate the pseudo-spectral controller perform…
View article: Field Test Results from Lidar Measured Yaw Control for Improved Yaw Alignment with the NREL Controls Advanced Research Turbine: Preprint
Field Test Results from Lidar Measured Yaw Control for Improved Yaw Alignment with the NREL Controls Advanced Research Turbine: Preprint Open
This paper describes field tests of a light detection and ranging (lidar) device placed forward looking on the nacelle of a wind turbine and used as a wind direction measurement to directly control the yaw position of a wind turbine. Conve…
View article: Testing State-Space Controls for the Controls Advanced Research Turbine: Preprint
Testing State-Space Controls for the Controls Advanced Research Turbine: Preprint Open
Control can improve wind turbine performance by enhancing energy capture and reducing dynamic loads. At the National Renewable Energy Laboratory, we are implementing and testing state-space controls on the Controls Advanced Research Turbin…
View article: Balancing the Power-to-Load Ratio for a Novel Variable Geometry Wave Energy Converter with Nonideal Power Take-Off in Regular Waves: Preprint
Balancing the Power-to-Load Ratio for a Novel Variable Geometry Wave Energy Converter with Nonideal Power Take-Off in Regular Waves: Preprint Open
This work attempts to balance power absorption against structural loading for a novel variable geometry wave energy converter. The variable geometry consists of four identical flaps that will be opened in ascending order starting with the …
View article: Disturbance Accommodating Control Design for Wind Turbines Using Solvability Conditions
Disturbance Accommodating Control Design for Wind Turbines Using Solvability Conditions Open
In this paper, solvability conditions for disturbance accommodating control (DAC) have been discussed and applied on wind turbine controller design in above-rated wind speed to regulate rotor speed and to mitigate turbine structural loads.…