An improved boundary element method for modelling a self-reacting point absorber wave energy converter

Xu, Qianlong; Li, Ye; Lin, Zhifang

doi:10.1007/s10409-018-0792-x

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…Another solution is the MPC [22][23][24], where the model is used to predict the future response of the system. This method can accurately estimate the parameters of the point-absorbing type WEC and search the maximum power point without detecting the dominant frequency of the wave.…”

Section: Introductionmentioning

confidence: 99%

“…The hill-climbing method cannot search the global maximum power point among multiple extreme points, due to its monotonous search Currently, various control methods of point-absorber type WEC for optimizing wave energy capture have been proposed, where the implementation complexity, the accuracy and the tracking speed of these techniques are different. These control techniques can be classified into four categories: (1) phase and amplitude control [15][16][17][18], (2) complex conjugate control [19][20][21], (3) model predictive control (MPC) [22][23][24], and (4) extremum-seeking control [25].…”

Section: Introductionmentioning

confidence: 99%

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A Flower Pollination Method Based Global Maximum Power Point Tracking Strategy for Point-Absorbing Type Wave Energy Converters

Zhao

Sun

et al. 2019

Energies

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To maximize the generated output power under random waves, the control strategy of maximum power point tracking (MPPT) is incorporated in point-absorbing type wave energy converter (WEC) system. However, due to the influence of mutative wave conditions, the curve of the maximum average power appears in multiple peaks, adding complexity to the tracking process. This paper proposes a new MPPT control technique for a wave power generation system, by using the flower pollination algorithm (FPA) instead of the conventional hill-climbing method. Compared with the hill-climbing method, this method has advantages of achieving a smaller peak-to-average ratio and capturing the more average power under the same sea state. The verification has been carried out through the simulations and the experimental results on a lab test bench.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Flower Pollination Method Based Global Maximum Power Point Tracking Strategy for Point-Absorbing Type Wave Energy Converters

Zhao

Sun

et al. 2019

Energies

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“…By building a numerical simulator, it was concluded that the PTO damping function and the spring properties play important roles in effectively harnessing the wave energy. In 2018, a numerical model based on the boundary element method (BEM) was developed by Xu et al 25 to predict the performance of a two-body, self-reacting, floating-point absorber wave energy system that operates predominantly in heave, and the key numerical issues in applying the BEM were systematically discussed, which solved a main source of difficulty in the BEM.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and structural optimization based on an elliptical and cylindrical raft wave energy conversion device

Jian-guo

Gao

Zheng

et al. 2018

Journal of Renewable and Sustainable Energy

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In recent years, research on wave energy development and utilization has been a hot topic, and many scholars have intensively researched raft-type energy conversion devices. This paper considers an elliptical and cylindrical raft wave energy conversion device from the perspective of stability and bionics to determine the structural parameters that correspond to optimal energy conversion in a three-level sea state. This paper studies the theoretical wave energy capture efficiency of cylindrical floats by drawing an analogy from the theoretical model. In addition, this paper determines the float structural parameters corresponding to the optimum capture efficiency by formulating numerical simulations and optimizing the parameters, such as the axis ratio of the cross-section, the spacing, the draught, the number of floats, the length of the float, the height of float's center of gravity, and others. In the optimization process, these six parameters were briefly analyzed in reference to the design of the Pelamis. The length of the float and the axial ratio of the cross-section are the main factors affecting the capture efficiency of the device. Therefore, the optimization sequence of the six parameters was determined by first controlling the main factors and then controlling the other factors. Then, the values of all the parameters were determined. The structural parameters of the float were observed to significantly influence the energy capturing effect of the device, and its efficiency was increased by intelligently selecting the structural parameters. Finally, the structural parameters of the elliptical and cylindrical raft wave energy conversion device were determined by comparing the capture efficiency under five typical wave conditions (WT.1 to WT.5) in a three-level sea state.

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Viscous effects on the added mass and damping forces during free heave decay of a floating cylinder with a hemispherical bottom

Chen

Zheng

et al. 2023

European Journal of Mechanics - B/Fluids

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An improved boundary element method for modelling a self-reacting point absorber wave energy converter

Cited by 10 publications

References 29 publications

A Flower Pollination Method Based Global Maximum Power Point Tracking Strategy for Point-Absorbing Type Wave Energy Converters

A Flower Pollination Method Based Global Maximum Power Point Tracking Strategy for Point-Absorbing Type Wave Energy Converters

Numerical simulation and structural optimization based on an elliptical and cylindrical raft wave energy conversion device

Viscous effects on the added mass and damping forces during free heave decay of a floating cylinder with a hemispherical bottom

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