Additional Degree of Freedom for WEC Model

McCall, Alan; Haider, Ali; Brekken, Ted

doi:10.15473/1870846

Title: Additional Degree of Freedom for WEC Model

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Abstract

'Additional Degree of Freedom for WEC' - WEC-Sim numerical model from RFTS 1 TEAMER project. An increase in wave energy converter (WEC) efficiency requires not only consideration of the nonlinear effects in the WEC dynamics and the power take-off (PTO) mechanisms, but also more integrated treatment of the whole system, i.e., the buoy dynamics, the PTO system, and the control strategy. It results in an optimization formulation that has a nonquadratic and nonstandard cost functional. This model presents the application of real-time nonlinear model predictive controller (NMPC) to two degrees of freedom point absorber type WEC with highly nonlinear PTO characteristics. The nonlinear effects, such as the fluid viscous drag, are also included in the plant dynamics. The controller may be implemented on a real-time target machine, and the WEC device is emulated in real-time using the WECSIM toolbox. Please see the ‘ReadMe’ within the root directory for an explanation of how to set-up and run the model. An article covering the development of this model is attached as "Real-Time Nonlinear Model Predictive Controller for Multiple Degrees of Freedom Wave Energy Converters with Non-Ideal Power Take-Off"

Authors:: McCall, Alan; Haider, Ali; Brekken, Ted

Publication Date:: Thu May 26 00:00:00 EDT 2022

Other Number(s):: 422

DOE Contract Number:: EE0008895

Research Org.:: Marine and Hydrokinetic Data Repository (MHKDR); Dehlsen Associates, LLC

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office (EE-4WP)

Collaborations:: Dehlsen Associates, LLC

Subject:: 16 Tidal and Wave Power

Keywords:: marine; energy; TEAMER; wave energy; WEC; numerical; model; MATLAB; PTO; power take off; wave energy converter; degrees of freedom; simulation; model data; simulation data; WECSim; dynamics; fluid dynamics

Geolocation:: 44.565754928117, -123.27889309734

OSTI Identifier:: 1870846

DOI:: https://doi.org/10.15473/1870846

Project Location:

Citation Formats


                    McCall, Alan, Haider, Ali, and Brekken, Ted. Additional Degree of Freedom for WEC Model.  United States: N. p., 2022. 
        Web.  doi:10.15473/1870846.

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                    McCall, Alan, Haider, Ali, & Brekken, Ted. Additional Degree of Freedom for WEC Model.  United States.  doi:https://doi.org/10.15473/1870846

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                    McCall, Alan, Haider, Ali, and Brekken, Ted. 2022.  
"Additional Degree of Freedom for WEC Model".  United States.  doi:https://doi.org/10.15473/1870846.  https://www.osti.gov/servlets/purl/1870846. Pub date:Thu May 26 00:00:00 EDT 2022

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@article{osti_1870846,

  title        = {Additional Degree of Freedom for WEC Model},

  author       = {McCall, Alan and Haider, Ali and Brekken, Ted},

  abstractNote = {'Additional Degree of Freedom for WEC' - WEC-Sim numerical model from RFTS 1 TEAMER project. An increase in wave energy converter (WEC) efficiency requires not only consideration of the nonlinear effects in the WEC dynamics and the power take-off (PTO) mechanisms, but also more integrated treatment of the whole system, i.e., the buoy dynamics, the PTO system, and the control strategy. It results in an optimization formulation that has a nonquadratic and nonstandard cost functional. This model presents the application of real-time nonlinear model predictive controller (NMPC) to two degrees of freedom point absorber type WEC with highly nonlinear PTO characteristics. The nonlinear effects, such as the fluid viscous drag, are also included in the plant dynamics. The controller may be implemented on a real-time target machine, and the WEC device is emulated in real-time using the WECSIM toolbox. Please see the ‘ReadMe’ within the root directory for an explanation of how to set-up and run the model. An article covering the development of this model is attached as "Real-Time Nonlinear Model Predictive Controller for Multiple Degrees of Freedom Wave Energy Converters with Non-Ideal Power Take-Off"},

  doi          = {10.15473/1870846},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu May 26 00:00:00 EDT 2022},

  month        = {Thu May 26 00:00:00 EDT 2022}

}

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DOI: https://doi.org/10.15473/1870846

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