A State-of-the-Art Strategy to Implement Nonlinear Model Predictive Controller with Non-Quadratic Piecewise Discontinuous Cost Index for Ocean Wave Energy Systems

2020 ◽  
Author(s):  
Ali Shahbaz Haider ◽  
Ted K. A. Brekken ◽  
Alan McCall
Keyword(s):  
Nonlinear Model ◽  
Wave Energy ◽  
State Of The Art ◽  
Energy Systems ◽  
Ocean Wave ◽  
Cost Index ◽  
Model Predictive Controller ◽  
Ocean Wave Energy ◽  
Predictive Controller

Available Ocean Wave Power and Prediction of Power Extracted by a Contouring Raft Conversion System

1983 ◽  
Vol 105 (4) ◽  
pp. 492-498 ◽  
Author(s):  
E. L. Burdette ◽  
C. K. Gordon
Keyword(s):  
Wave Energy ◽  
Pacific Coast ◽  
Mechanical Energy ◽  
Energy Systems ◽  
Open Water ◽  
Ocean Wave ◽  
Northwest Pacific ◽  
Ocean Wave Energy ◽  
Wave Energy Flux ◽  
Made In

Techniques are described which have been employed to develop detailed, quantitive estimates of the available ocean wave energy flux. A summary of results for a region of particular interest to potential U.S. developers of wave energy systems — the U.S. Northwest Pacific Coast — is also presented. Comparisons with results of other studies are made. In addition, a method for predicting the amount of mechanical energy captured by a conversion device, based on a frequency domain technique, is presented. Results are predicted for an articulated, contour following raft deployed in deep, open water west of the mouth of the Columbia River.

scholarly journals Real-Time Nonlinear Model Predictive Controller for Multiple Degrees of Freedom Wave Energy Converters with Non-Ideal Power Take-Off

2021 ◽  
Vol 9 (8) ◽  
pp. 890
Author(s):  
Ali S. Haider ◽  
Ted K. A. Brekken ◽  
Alan McCall
Keyword(s):  
Real Time ◽  
Nonlinear Model ◽  
Wave Energy ◽  
Degrees Of Freedom ◽  
Nonlinear Effects ◽  
Integrated Treatment ◽  
Viscous Drag ◽  
Model Predictive Controller ◽  
Highly Nonlinear ◽  
Predictive Controller

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 article 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 is implemented on a real-time target machine, and the WEC device is emulated in real-time using the WECSIM toolbox. The results for the successful performance of the design are presented for irregular waves under linear and nonlinear hydrodynamic conditions.

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