Adaptive Model Predictive Control of Wave Energy Converters

In this paper, we propose an adaptive hierarchical model predictive control (AHMPC) scheme for wave energy converters (WECs). This AHMPC enables adaptive tuning mechanism for a model predictive control (MPC) strategy by estimating the dynamics of a WEC online, so that it can recover from performance degradation of a WEC due to the dynamics variations at different sea conditions. The proposed AHMPC consists of two layers: On the top layer, an efficient cascaded estimation algorithm is developed to online identify and update the WEC model adaptively according to the change of sea states; on the bottom layer, a specially tailored MPC controller is implemented based on the updated WEC model to maximize the energy output subject to constraints for safe operation requirements. Numerical simulations are provided to show the efficacy of the proposed AHMPC scheme.

[1]  Guang Li,et al.  Wave energy converter control by wave prediction and dynamic programming , 2012 .

[2]  Guido Herrmann,et al.  Robust Optimal Control of Wave Energy Converters Based on Adaptive Dynamic Programming , 2019, IEEE Transactions on Sustainable Energy.

[3]  John V. Ringwood,et al.  Adaptive Control of a Wave Energy Converter , 2018, IEEE Transactions on Sustainable Energy.

[4]  F. Fusco,et al.  A Simple and Effective Real-Time Controller for Wave Energy Converters , 2013, IEEE Transactions on Sustainable Energy.

[5]  John Ringwood,et al.  Optimal control, MPC and MPC-like algorithms for wave energy systems: An overview , 2017, IFAC J. Syst. Control..

[6]  Michel Guglielmi,et al.  Declutching control of a wave energy converter , 2009 .

[7]  Guang Li,et al.  Linear Optimal Noncausal Control of Wave Energy Converters , 2019, IEEE Transactions on Control Systems Technology.

[8]  J. Falnes,et al.  STATE-SPACE MODELLING OF A VERTICAL CYLINDER IN HEAVE , 1995 .

[9]  Yuanqing Xia,et al.  Adaptive parameter identification of linear SISO systems with unknown time-delay , 2014, Syst. Control. Lett..

[10]  Sy-Ruen Huang,et al.  Multivariable direct-drive linear generators for wave energy , 2012 .

[11]  O. Sawodny,et al.  Nonlinear Model Predictive Control of a Point Absorber Wave Energy Converter , 2013, IEEE Transactions on Sustainable Energy.

[12]  Daniel L. Laird,et al.  Technological Cost-Reduction Pathways for Point Absorber Wave Energy Converters in the Marine Hydrokinetic Environment. , 2013 .

[13]  John V. Ringwood,et al.  Hierarchical Robust Control of Oscillating Wave Energy Converters With Uncertain Dynamics , 2014, IEEE Transactions on Sustainable Energy.

[14]  Guido Herrmann,et al.  Vehicle Engine Torque Estimation via Unknown Input Observer and Adaptive Parameter Estimation , 2018, IEEE Transactions on Vehicular Technology.

[15]  I. Glendenning,et al.  Ocean wave power , 1977 .

[16]  G. Weiss,et al.  Optimal control of wave energy converters using deterministic sea wave prediction , 2013 .

[17]  Guang Li,et al.  Model predictive control of sea wave energy converters – Part I: A convex approach for the case of a single device , 2014 .

[18]  John V. Ringwood,et al.  Estimation and Forecasting of Excitation Force for Arrays of Wave Energy Devices , 2018, IEEE Transactions on Sustainable Energy.

[19]  T. Barnett,et al.  Measurements of wind-wave growth and swell decay during the Joint North Sea Wave Project (JONSWAP) , 1973 .

[20]  António F.O. Falcão,et al.  Phase control through load control of oscillating-body wave energy converters with hydraulic PTO system , 2008 .

[21]  Guang Li,et al.  Nonlinear model predictive control of a wave energy converter based on differential flatness parameterisation , 2017, Int. J. Control.

[22]  Aurélien Babarit,et al.  Comparison of latching control strategies for a heaving wave energy device in random sea , 2004 .

[23]  Margaret E. Ochs,et al.  SAND 2013-7207 Unlimited Release Printed September 2013 Technological Cost-Reduction Pathways for Attenuator Wave Energy Converters in the Marine Hydrokinetic Environment , 2013 .

[24]  Guang Li,et al.  Robust Feedback Model Predictive Control of Sea Wave Energy Converters , 2017 .

[25]  John V. Ringwood,et al.  Energy-Maximizing Control of Wave-Energy Converters: The Development of Control System Technology to Optimize Their Operation , 2014, IEEE Control Systems.

[26]  John Ringwood,et al.  A critical comparison of model-predictive and pseudospectral control for wave energy devices , 2016 .

[27]  John Ringwood,et al.  Finite-order hydrodynamic model determination for wave energy applications using moment-matching , 2018, Ocean Engineering.

[28]  A. Clément,et al.  Wave energy in Europe: current status and perspectives , 2002 .

[29]  John Ringwood,et al.  Mathematical modelling of wave energy converters: A review of nonlinear approaches , 2017 .

[30]  Tristan Perez,et al.  Time- vs. frequency-domain identification of parametric radiation force models for marine structures at zero speed , 2008 .

[31]  W. Cummins THE IMPULSE RESPONSE FUNCTION AND SHIP MOTIONS , 2010 .

[32]  J. Falnes Ocean Waves and Oscillating Systems: Linear Interactions Including Wave-Energy Extraction , 2002 .