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Wave power

About: Wave power is a research topic. Over the lifetime, 2671 publications have been published within this topic receiving 41439 citations. The topic is also known as: wind wave energy & sea wave energy.


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Patent
08 Aug 2007
TL;DR: In this article, a hydraulic cylinder wave power generating device with float hanging down, comprising a float on sea surface, is described, where the lower end of float is connected with the bottom of inverted spring recovery hydraulic cylinder through flexible steel ropes.
Abstract: The invention provides a hydraulic cylinder wave power generating device with float hanging down, comprising a float on sea surface. The lower end of float is connected with the bottom of inverted spring recovery hydraulic cylinder through flexible steel ropes. The piston in spring recovery hydraulic cylinder extends to the lower end and is fixed on the submarine by anchor chain. The hydraulic oil pipe of spring recovery hydraulic cylinder is connected with a hydraulic reservoir, which is connected with a hydraulic motor. The hydraulic motor is connected with a generator. The invention mainly makes use of the hydraulic system to transfer energies and the hydraulic reservoir to realize the transformation of energy from instability to stability and gradually realize the transformation from the wave energy to the float mechanical energy, and to the hydraulic energy, and to the motor mechanical energy, finally to the electric energy. The invention is designed based on the demand for applying in the sea region farther from bank. The invention is provided with simple equipment structure, small cubage, easy installation and maintenance. It can be used in various sea regions widely. By connecting multiple single equipments with cables the demand of extracting wave energy in a large scale can be realized.

26 citations

Journal ArticleDOI
TL;DR: In this article, a 1/36 two-dimensional model of the Islay prototype wave power station was used to assess the influence of geometry changes on the hydraulic performance, and it was found that large vortices developed around the comparatively thin front wall for in- and outflow and internal sloshing occurs during the inflow period.

26 citations

Journal ArticleDOI
TL;DR: In this paper, Liu et al. studied the scattering and trapping of wave energy by a submerged truncated paraboloidal shoal, where the mild-slope equation was transformed into an explicit equation by using Hunt's 1979 Pade approximation to the wave dispersion equation.
Abstract: In this paper, we study the scattering and trapping of wave energy by a submerged truncated paraboloidal shoal. The analytical approach of Liu et al. in 2004 for solving wave amplification around a circular island mounted on a shoal is extended in this study to investigate waves above a submerged shoal. In this approach, the mild-slope equation is first transformed into an explicit equation by using Hunt's 1979 Pade approximation to the wave dispersion equation. It is then solved analytically in terms of combined Fourier series and Taylor series. For incident waves varying from short to long waves, wave amplifications in the vicinity of the shoal are calculated using the newly derived analytical model and they agree excellently with the finite difference solutions of Lin in 2004. It is found that, for the particular shoal studied in this paper, there exists an energy focal point where the wave amplitude is the maximum. This point is the result of combined wave refraction, diffraction, and reflection. The point is always located along the x-axis and it is behind the shoal center for very short waves. As the increase of wave period, it moves upstream and it can come in front of the shoal center for very long waves when wave reflection is significant. For a particular incident wave, wave amplification increases and the focal point moves toward the shoal center with the reduction of the water depth above the shoal center. The maximum wave amplitude increases exponentially as the decrease of local water depth. It is also found that there exists the so-called "calm" areas for shallowly submerged shoal, which are located behind the focal point and the local amplitude can be as small as nearly zero.

26 citations

Journal ArticleDOI
TL;DR: In this article, the numerical code to generate waves in a 3D Numerical Wave Tank (NWT) is first validated against experimental data to check the accuracy and robustness of the code.

26 citations

Journal ArticleDOI
10 Feb 2018-Sensors
TL;DR: The aim of this work is to manage the rotational speed control loop in order to optimize the output power and a novel sensor-based flow controller is implemented based on the different measured signals.
Abstract: Oceans, and particularly waves, offer a huge potential for energy harnessing all over the world. Nevertheless, the performance of current energy converters does not yet allow us to use the wave energy efficiently. However, new control techniques can improve the efficiency of energy converters. In this sense, the plant sensors play a key role within the control scheme, as necessary tools for parameter measuring and monitoring that are then used as control input variables to the feedback loop. Therefore, the aim of this work is to manage the rotational speed control loop in order to optimize the output power. With the help of outward looking sensors, a Maximum Power Point Tracking (MPPT) technique is employed to maximize the system efficiency. Then, the control decisions are based on the pressure drop measured by pressure sensors located along the turbine. A complete wave-to-wire model is developed so as to validate the performance of the proposed control method. For this purpose, a novel sensor-based flow controller is implemented based on the different measured signals. Thus, the performance of the proposed controller has been analyzed and compared with a case of uncontrolled plant. The simulations demonstrate that the flow control-based MPPT strategy is able to increase the output power, and they confirm both the viability and goodness.

26 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202349
2022117
2021111
2020142
2019137
2018138