Simulation of wave power devices

Jefferys, E.R.

doi:10.1016/0141-1187(84)90026-9

Cited by 69 publications

(27 citation statements)

References 4 publications

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“…Simulation results confirm that assumption. In case there was a larger influence of these terms, the convolution terms can be approximated by a linear state space model by methods described in [18] and [19]. However, this is not necessary here.…”

Section: A Equations Of Motionmentioning

confidence: 98%

“…The only nonlinearity in the reduced model is the mooring force. Replacing the nonlinear mooring force by the linear law (18) yields the linear model, which the linear MPC is based on in this paper.…”

Section: A Equations Of Motionmentioning

confidence: 99%

“…The NMPC and the linear MPC are implemented using Matlab/SIMULINK. The linear MPC is based on the work in [13] and uses the reduced system with the linear mooring law (18). The NMPC uses the solver "fmincon" of Matlab which can handle nonlinear problems with nonlinear constraints as well.…”

Section: Problem Formulation and Implementation Of Nmpcmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear Model Predictive Control of a Point Absorber Wave Energy Converter

Richter¹,

Magaña

Sawodny³

et al. 2013

IEEE Trans. Sustain. Energy

156

130

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This paper presents the application of nonlinear model predictive control (NMPC) to a point absorber wave energy converter (WEC). Model predictive control (MPC) is generally a promising approach for WECs, since system constraints and actuator limits can be taken into account. Moreover, it provides a framework for defining optimal energy capture and it can benefit from predictions. Due to possible nonlinear effects, such as the mooring forces, an NMPC is proposed in this paper, whose performance is compared to that of a linear MPC. Both controllers are supposed to control a nonlinear point absorber model. Computer simulations show that the proposed NMPC is able to optimize the energy capture while satisfying system limits.Index Terms-Nonlinear model predictive control, point absorber, wave energy converter.

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Section: A Equations Of Motionmentioning

confidence: 98%

Section: A Equations Of Motionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear Model Predictive Control of a Point Absorber Wave Energy Converter

Richter¹,

Magaña

Sawodny³

et al. 2013

IEEE Trans. Sustain. Energy

156

130

View full text Add to dashboard Cite

show abstract

“…The two proposals are related. In the sequel, we revisit the second approach, which was first proposed by Jefferys (1984) and then further analysed by Damaren (2000). Kaasen and Mo (2004) propose a variant to estimate the parameters of the approximation for K(jω), but using only the data of B(ω).…”

Section: Frequency-domain Identificationmentioning

confidence: 99%

Time- vs. Frequency-domain Identification of Parametric Radiation Force Models for Marine Structures at Zero Speed

Pérez

Fossen²

2008

MIC

130

104

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The dynamics describing the motion response of a marine structure in waves can be represented within a linear framework by the Cummins Equation. This equation contains a convolution term that represents the component of the radiation forces associated with fluid memory effects. Several methods have been proposed in the literature for the identification of parametric models to approximate and replace this convolution term. This replacement can facilitate the model implementation in simulators and the analysis of motion control designs. Some of the reported identification methods consider the problem in the time domain while other methods consider the problem in the frequency domain. This paper compares the application of these identification methods. The comparison is based not only on the quality of the estimated models, but also on the ease of implementation, ease of use, and the flexibility of the identification method to incorporate prior information related to the model being identified. To illustrate the main points arising from the comparison, a particular example based on the coupled vertical motion of a modern containership vessel is presented.

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“…Other identification methods for similar application can be found in [27]- [29]. The excitation force can be defined as follows:…”

Section: A Equation Of Motionmentioning

confidence: 99%

A resistance emulation approach to optimize the wave energy harvesting for a direct drive point absorber

Mendonça

Martínez

2016

IEEE Trans. Sustain. Energy

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Abstract-In general, a major challenge for the exploitation of renewable energies is to improve their efficiency. In electricity generation from the energy of ocean waves, not unlike other technologies, the converter must be optimized to make the energy harvesting economically feasible. This paper proposes a passive tuning control strategy of a point absorber in which the power captured is maximized by controlling the electromagnetic force of the generator with a resistance emulation approach. The proposed strategy consists of mapping the optimal values for regular waves and applying them to irregular waves. This strategy is tested in a wave energy converter in which the generator is connected to a boost rectifier converter whose controller is designed to emulate a resistance. The power electronics system implemented is validated by comparing its performance with the case in which the generator is directly connected to a resistive load. The simulation results show the effectiveness of the proposed strategy as the maximum captured power is concentrated around the optimal values previously calculated and with the same behavior for both excitations.Index Terms-Boost rectifier, maximum captured power, point absorber, resistance emulation, wave energy converter (WEC).

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Simulation of wave power devices

Cited by 69 publications

References 4 publications

Nonlinear Model Predictive Control of a Point Absorber Wave Energy Converter

Nonlinear Model Predictive Control of a Point Absorber Wave Energy Converter

Time- vs. Frequency-domain Identification of Parametric Radiation Force Models for Marine Structures at Zero Speed

A resistance emulation approach to optimize the wave energy harvesting for a direct drive point absorber

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