Experimental Validation of a Nonlinear MPC Strategy for a Wave Energy Converter Prototype

Nguyen, Hoaï-Nam; Sabiron, Guillaume; Tona, Paolino; Kramer, Morten; Sanchez, Enrique Vidal

doi:10.1115/omae2016-54455

Cited by 24 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An array of three WECs is considered in Oetinger, Magaña, and Sawodny 2014, where each device behaves like a heaving point absorber moored to the sea-floor, with a certain angle with respect to the surface, as in Vicente, Antonio, Gato, and Justino (2009) . Finally, a different type of point absorber is considered in Andersen, Pedersen, Nielsen, and Vidal (2015) and Nguyen, Sabiron, Tona, Kramer, and Sanchez (2016) , which is based on a real prototype sited in Hansen and Kramer (2011) , composed of a number of hemispherically shaped floats attached to a single platform.…”

Section: Wec Modelmentioning

confidence: 99%

Optimal control, MPC and MPC-like algorithms for wave energy systems: An overview

Faedo

Olaya

Ringwood

2017

IFAC Journal of Systems and Control

218

165

View full text Add to dashboard Cite

Model predictive control (MPC) has achieved considerable success in the process industries, with its ability to deal with linear and nonlinear models, while observing system constraints and considering future behaviour. Given these characteristics, against the backdrop of the energy maximising control problem for Wave Energy Converters (WECs), with physical constraints on system variables and a non-causal optimal control solution it is, perhaps, natural to consider the application of MPC to the WEC problem. However, the WEC energy maximisation problem requires a significant modification of the traditional MPC objective function, resulting in a potentially non-convex optimisation problem. A variety of MPC formulations for WECs have been proposed, with variations in the WEC model, discretisation method, objective function and optimisation algorithm employed. This paper attempts to provide a critical comparison of the various WEC MPC algorithms, while also presenting WEC MPC algorithms within the broader context of other WEC "optimal" control schemes.

show abstract

Section: Wec Modelmentioning

confidence: 99%

Optimal control, MPC and MPC-like algorithms for wave energy systems: An overview

Faedo

Olaya

Ringwood

2017

IFAC Journal of Systems and Control

218

165

View full text Add to dashboard Cite

show abstract

“…The tests were carried out within a broader campaign to assess the performance of a full MPC control system [27], as depicted in Fig. 2.…”

Section: A Experimental Setupmentioning

confidence: 99%

Wave Excitation Force Estimation for Wave Energy Converters of the Point-Absorber Type

Nguyen

Tona

2018

IEEE Trans. Contr. Syst. Technol.

View full text Add to dashboard Cite

Abstract-Advanced control strategies play a crucial role in increasing the energy extraction capacity of wave energy converters (WECs). So far, the most promising control schemes have predominantly been studied in simulation, based on the idealized assumption of the wave excitation force availability in real time. In practical WEC implementations, this is not the case, since this force cannot be measured directly when the WECs are running. Hence the force has to be estimated via measurements of other quantities. Two approaches are presented in this paper to fulfill this objective. The first approach is based on a Kalman filter coupled with a random-walk model of the wave excitation force, while a receding horizon -unknown input estimation approach is employed for the second one. The proposed estimation methods are evaluated by using real measurements from a laboratory scale WEC.

show abstract

“…Despite the comparative simulation results available [3], there is also a desire to compare a variety of WEC control strategies under real, or at least wave tank, implementation scenarios (see, for example, [9]), so that all real effects are encountered, such as nonlinear hydrodynamic and power take off (PTO) effects; realistic measurement assumptions, including the presence of measurement noise and bias; and real-time computational requirements. In the first phase of WECCCOMP, nonlinear power take-off efficency was include, but the remaining effects will be encountered in the second experimental phase of WECCCOMP.…”

Section: Introductionmentioning

confidence: 99%

The Wave Energy Converter Control Competition: Overview

Ringwood

Ferri

Tom

et al. 2019

Volume 10: Ocean Renewable Energy

View full text Add to dashboard Cite

Over the past two years, a wave energy converter control systems competition (WECCCOMP) has been in progress, with the objective of comparing different wave energy converter (WEC) control paradigms on a standard benchmark problem. The target system is a point absorber, corresponding to a single float with an absolute reference, of the WaveStar WEC prototype. The system was modelled in WEC-Sim, with the hydrodynamic parameters validated against tank test data. Competitors were asked to design and implement a WEC control system for this model, with performance evaluated across six sea states. The evaluation criteria included a weighted combination of average converted power, peak/average power, and the degree to which the system physical constraints were exploited or temporarily exceeded. This paper provides an overview of the competition, which includes a comparative evaluation of the entries and their performance on the simulation model. It is intended that this paper will act as an anchor presentation in a special session on WECCCOMP at OMAE 2019, with other papers in the special session contributed by the competitors, describing in detail the control algorithms and the results achieved over the various sea states.

show abstract

Experimental Validation of a Nonlinear MPC Strategy for a Wave Energy Converter Prototype

Cited by 24 publications

References 16 publications

Optimal control, MPC and MPC-like algorithms for wave energy systems: An overview

Optimal control, MPC and MPC-like algorithms for wave energy systems: An overview

Wave Excitation Force Estimation for Wave Energy Converters of the Point-Absorber Type

The Wave Energy Converter Control Competition: Overview

Contact Info

Product

Resources

About