|Table of Contents|

Citation:
 Qian Zhong,Ronald W. Yeung.Model-Predictive Control Strategy for an Array of Wave-Energy Converters[J].Journal of Marine Science and Application,2019,(1):26-37.[doi:10.1007/s11804-019-00081-x]
Click and Copy

Model-Predictive Control Strategy for an Array of Wave-Energy Converters

Info

Title:
Model-Predictive Control Strategy for an Array of Wave-Energy Converters
Author(s):
Qian Zhong Ronald W. Yeung
Affilations:
Author(s):
Qian Zhong Ronald W. Yeung
Department of Mechanical Engineering, The Berkeley Marine Mechanics Laboratory, University of California at Berkeley, Berkeley, CA 94720-1740, USA
Keywords:
Wave-energy conversionWave-energy arraysPoint-absorber approximationModel predictive controlConvex formulation
分类号:
-
DOI:
10.1007/s11804-019-00081-x
Abstract:
To facilitate the commercialization of wave energy in an array or farm environment, effective control strategies for improving energy extraction efficiency of the system are important. In this paper, we develop and apply model-predictive control (MPC) to a heaving point-absorber array, where the optimization problem is cast into a convex quadratic programming (QP) formulation, which can be efficiently solved by a standard QP solver. We introduced a term for penalizing large slew rates in the cost function to ensure the convexity of this function. Constraints on both range of the states and the input capacity can be accommodated. The convex formulation reduces the computational hurdles imposed on conventional nonlinear MPC. For illustration of the control principles, a point-absorber approximation is adopted to simplify the representation of the hydrodynamic coefficients among the array by exploiting the small devices to wavelength assumption. The energycapturing capabilities of a two-cylinder array in regular and irregular waves are investigated. The performance of the MPC for this two-WEC array is compared to that for a single WEC, and the behavior of the individual devices in head or beam wave configuration is explained. Also shown is the reactive power required by the power takeoff system to achieve the performance.

References:

Bacelli G et al (2016) A comparison of WEC control strategies for a linear WEC model. In:Proceedings of the 4th marine energy technology symposium (METS)
Barcelli G, Ringwood J (2013) Constrained control of arrays of wave energy devices. Int J Marine Energy 3:53-69
Chau FP, Yeung RW (2012) Inertia, damping, and wave excitation of heaving coaxial cylinders. In:ASME 31st international conference on ocean, offshore and arctic engineering. Rio de Janeiro, Brazil, July 1-6, OMAE2012-83987
Evans DV (1979) Some theoretical aspects of three-dimensional wave-energy absorbers. In:Proceedings of the first symposium on wave energy utilization. Chalmers University of Technology, Gothenburg, Sweden, pp 77-106
Evans DV (1981) Maximum wave-power absorption under motion constraints. Appl Ocean Res 3(4):200-203
Falnes J (1980) Radiation impedance matrix and optimum power absorption for interacting oscillators in surface waves. Appl Ocean Res 2(2):75-80
Falnes J (2002) Ocean waves and oscillating systems:linear interactions including wave-energy extraction. Cambridge University Press, Cambridge
Falnes J, Budal K (1982) Wave-power absorption by parallel rows of interacting oscillating bodies. Appl Ocean Res 4(4):194-207
Fusco F, Ringwood JV (2012) A study of the prediction requirements in real-time control of wave energy converters. IEEE Trans Sustain Energy 3(1):176-184
Hals J, Falnes J, Moan T (2011a) A comparison of selected strategies for adaptive control of wave energy converters. J Offshore Mech Arctic Eng 133(3):031101
Hals J, Falnes J, Moan T (2011b) Constrained optimal control of a heaving buoy wave-energy converter. J Offshore Mech Arctic Eng 133(1):011401
Kagemoto H, Yue DK (1986) Interactions among multiple threedimensional bodies in water waves:an exact algebraic method. J Fluid Mech 166:189-209
Li G, Belmont MR (2014a) Model predictive control of sea wave energy converters-Part I:a convex approach for the case of a single device. Renew Energy 69:453-463
Li G, Belmont MR (2014b) Model predictive control of sea wave energy converters-Part Ⅱ:the case of an array of devices. Renew Energy 68:540-549
McIver P (1994) Some hydrodynamic aspects of arrays of wave-energy devices. Appl Ocean Res 16(2):61-69
Morris EL, Zienkiewicz HK, Belmont MR (1998) Short term forecasting of the sea surface shape. Int Shipbuilding Prog 45(444):383-400
Ohkusu M (1974) Hydrodynamic forces on multiple cylinders in waves. In:International symposium on the dynamics of marine vehicles and structures in waves
Simon MJ (1982) Multiple scattering in arrays of axisymmetric waveenergy devices. Part 1. A matrix method using a plane-wave approximation. J Fluid Mech 120:1-25
Son D, Belissen V, Yeung RW (2016) Performance validation and optimization of a dual coaxial-cylinder ocean-wave energy extractor. Renew Energy 92:192-201
Son D, Yeung RW (2017) Optimizing ocean-wave energy extraction of a dual coaxial-cylinder WEC using nonlinear model predictive control. Appl Energy 187:746-757
Thomas GP, Evans DV (1981) Arrays of three-dimensional waveenergy absorbers. J Fluid Mech 108:67-88
Tom N, Yeung RW (2014) Nonlinear model predictive control applied to a generic ocean-wave energy extractor. J Offshore Mech Arctic Eng 136(4):041901
Wehausen JV (1971) The motion of floating bodies. Ann Rev Fluid Mech 3(1):237-268
Zhong Q, Yeung RW (2016) Wave-body interactions among an array of truncated vertical cylinders. In:ASME 35th international conference on ocean, offshore and arctic engineering. Busan, South Korea, June 19-24, OMAE2016-55055
Zhong Q, Yeung RW (2017) An efficient convex formulation for model predictive control on wave-energy converters. In:ASME 36th international conference on ocean, offshore and arctic engineering. Trondheim, Norway, OMAE2017-62575

Memo

Memo:
Received date:。
Corresponding author:Ronald W. Yeung,rwyeung@berkeley.edu
Last Update: 2019-05-14