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Power Maximization of A Point Absorber wave energy converter Using Improved Model Predictive Control

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China Ocean Engineering 2017年第4期31卷 510-516页

作者： Farideh MILANI Reihaneh Kardehi MOGHADDAM Department of Electrical Engineering Mashhad Branch Islamic Azad University Mashhad Iran

This paper considers controlling and maximizing the absorbed power of wave energy converters for irregular waves. With respect to physical constraints of the system, a model predictive control is applied. Irregular waves’ behavior is predicted by Kalman filter method. Owing to the great influence of controller parameters on the absorbed power, these parameters are optimized by imperialist competitive algorithm. The results illustrate the method’s efficiency in maximizing the extracted power in the presence of unknown excitation force which should be predicted by Kalman filter.

关键词： wave energy converter Kalman filter model predictive control imperialist competitive algorithm

Effect of Different Raft Shapes on Hydrodynamic Characteristics of the Attenuator-Type wave energy converter

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中国海洋工程:英文版 2023年第4期37卷 645-659页

作者： WANG Jin WANG Shu-qi JIANG Qing-dian XU Yun-xin SHI Wei-chao School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Naval Architecture Ocean and Marine EngineeringUniversity of StrathclydeGlasgowG40LZUK

A numerical simulation method based on CFD has been established to simulate the fully coupled motion for an atten-uator-type wave energy converter(WEC).Based on this method,a detailed parametric analysis has been conducted to investigate the design of the *** effects of different parameters(wave parameters,structural parameters and PTO parameters)on the hydrodynamic characteristics of the attenuator-type WEC were studied in *** results show that in terms of wave parameters,there is an optimal wave period,which makes the relative pitching angle amplitude of the WEC reach the maximum,and the increase of wave height is conducive to the relative pitching angle amplitude of wave *** different wave conditions,the relative pitch angle of the parallelogram raft device is the *** terms of structural parameters,the parallelogram attenuator-type device has the optimal values in different relative directions,different distances and different apex angle,which makes the relative motion amplitude of the device reach the maximum,and the spacing and the apex angle have influence on the motion frequency of the device,while the relative direction has almost no influence on *** terms of PTO parameters,there is an optimal damping coefficient,which makes the power generation efficiency of the WEC reach the *** research results provide a valuable reference for future research and design of the attenuator-type WEC.

关键词： wave energy converter attenuator-type shape hydrodynamic analysis power generation efficiency

wave Extraction and Attenuation Performance of An Edinburgh Duck wave energy converter

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China Ocean Engineering 2021年第6期35卷 905-913页

作者： ZHOU Bin-zhen LI Jia-hui ZHANG Heng-ming CHEN Li-fen WANG Lei JIN Peng School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Edinburgh Duck wave energy converter(ED WEC)has excellent energy extraction performance and shows a great potential to integrate with other marine *** paper aims to investigate its wave energy extraction performance as a WEC and wave attenuation performance as a protection method for shoreline or marine *** wave and ED WEC interactions in regular waves are modeled using the Star-CCM+software and verified by comparisons with published experimental *** motion response,energy conversion efficiency,and transmission coefficient of the ED WEC with different attack angles,rotation center,and incident wave heights are *** indicate that the ED WEC with an attack angle of 42°and a rotation center of 0.55 m below the mean water line can achieve both good wave energy extraction and wave attenuation *** wave energy extraction and wave attenuation performance of the ED WEC decrease significantly with the increase of wave nonlinearity characterized by the wave *** paper can guide the practical application of the ED WEC at the early stage of design.

关键词： Edinburgh Duck wave energy converter wave energy extraction wave attenuation wave nonlinearity

Dynamic Properties and energy Conversion Efficiency of A Floating Multi-Body wave energy converter

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China Ocean Engineering 2018年第3期32卷 347-357页

作者： YANG Shao-hui WANG Yong-qing HE Hong-zhou ZHANG Jun CHEN Hu College of Mechanical and energy Engineering Jimei UniversityXiamen 361021China Key Laboratory of energy Cleaning Utilization and Development of Fujian Province Xiamen 361021China Key Laboratory of Ocean Renewable energy Equipment Fujian Province UniversityXiamen 361021China

The present study proposed a floating multi-body wave energy converter composed of a floating central platform,multiple oscillating bodies and multiple actuating arms. The relative motions between the oscillating bodies and the floating central platform capture multi-point wave energy simultaneously. The converter was simplified as a forced vibration system with three degrees of freedom, namely two heave motions and one rotational motion. The expressions of the amplitude-frequency response and the wave energy capture width were deduced from the motion equations of the converter. Based on the built mathematical model, the effects of the PTO damping coefficient, the PTO elastic coefficient, the connection length between the oscillating body and central platform, and the total number of oscillating bodies on the performance of the wave energy converter were investigated. Numerical results indicate that the dynamical properties and the energy conversion efficiency are related not only to the incident wave circle frequency but also to the converter’s physical parameters and interior PTO coefficients. By adjusting the connection length, higher wave energy absorption efficiencies can be obtained. More oscillating bodies installed result in more stable floating central platform and higher wave energy conversion efficiency.

关键词： wave energy converter multi-point absorption conversion efficiency vibration properties

Numerical study of hydrodynamic behavior and conversion efficiency of a two-buoy wave energy converter

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Journal of Hydrodynamics 2018年第2期30卷 235-248页

作者： Cen Yang Yong-liang Zhang State Key Laboratory of Hydro-Science and Engineering Tsinghua University Beijing 100084 China

In this paper we propose a two-buoy wave energy converter composed of a heaving semi-submerged cylindrical buoy, a fixed submerged cylindrical buoy and a power take-off（PTO） system, and investigate the effect of the fixed submerged buoy on the hydrodynamics of the heaving semi-submerged buoy based on the three-dimensional potential theory. And the dynamic response of the semi-submerged buoy and the wave energy conversion efficiency of the converter are analyzed. The difference of the hydrodynamics and the wave energy conversion efficiency of a semi-submerged buoy converter with and without a fixed submerged buoy is discussed. It is revealed that the influence of the fixed submerged buoy on the exciting wave force, the added mass, the radiation damping coefficient and the wave energy conversion efficiency can be significant with a considerable variation, depending on the vertical distance between the heaving semi-submerged buoy and the fixed submerged buoy, the diameter ratio of the fixed submerged buoy to the heaving semi-submerged buoy and the water depth.

关键词： wave energy converter two-buoy hydrodynamics conversion efficiency fluid-structure interaction power take-off

Shape optimization design of a heaving buoy of wave energy converter based on fully parametric modeling and CFD method

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Journal of Hydrodynamics 2022年第6期34卷 1081-1094页

作者： Shuo Huang Wei-qi Liu Kai Wang Tie-cheng Wu Tian-hui Liu School of Ocean Engineering and Technology Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai519000China

The hydrodynamic shape of the heaving buoy is an important factor of the motion response in waves and thus concerns the energy conversion efficiency for the point absorbers(PAs).The current experience-based designs are time consuming and not very efficient,hence,faster and smarter methods are *** automated optimization method based on a fully parametric modeling method and computational fluid dynamics(CFD),is proposed in this *** this method,a benchmark buoy is screen designed and then optimized by maximizing the heave motion *** geometry is described parametrically and deformed by means of the free-form deformation(FFD)*** the optimization process,the expansion factor of control points is the basis for the variations.A combination of the Sobol and the non-dominated sorting genetic algorithm II(NSGA-II)is used to search for the *** several iterations,the heaving buoy shape with optimal heave motion response is *** analyses show that the heave motion response has increased 55.3%after *** developed methodology is valid and seems to be a promising way to design a novel buoy that can significantly improve the wave energy conversion efficiency of the PAs in future.

关键词： wave energy converter geometric shape optimization fully parametric modeling method computational fluid dynamics(CFD)

Experimental Study on A Pendulum wave energy converter

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China Ocean Engineering 2013年第3期27卷 359-368页

作者：邱守强叶家玮王冬姣梁富琳 School of Civil Engineering and Transportation South China University of Technology

Many of the existing wave energy converters （WEC） are of oscillating water column （OWC） and point absorber （PA） types. Fewer references have been published in public on the pendulum type WEC. A series of experimental tests on a bottom-hinged pendulum WEC model are carded out and some results are revealed in the present study. The purpose of this paper is to present a detailed description of the tests. It is found that wave energy conversion efficiency varies with the applied damping and wave conditions. In addition, special attention is given to the effect of the water ballast on the efficiency of the wave energy converter. It is demonstrated that the ballast plays an important role in energy extraction. Better understanding on how the performance of the device is influenced by damping, wave height, wave period and ballast is shown.

关键词： wave energy converter pendulum damping efficiency ballast

Frequency/time domain modeling of a direct drive point absorber wave energy converter

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Science China(Physics,Mechanics & Astronomy) 2014年第2期57卷 311-320页

作者： CHENG ZhengShun YANG JianMin HU ZhiQiang XIAO LongFei State Key Lab of Ocean Engineering Shanghai Jiao Tong University

Two different methods to model a point absorber wave energy converter （WEC） with direct drive linear power take-off （PTO） are proposed in the present study： the frequency domain （FD） method and the time domain （TD） method. In the FD analysis, the frequency response function （FRF） of the WEC device is obtained via the equation of motion, and the expressions of power capture width in regular and random waves are derived as well. In the TD modeling, based on a state space approximation of the convolution term in the motion equation, both regular wave and random wave simulations are carded out. The regular wave simulation results indicate that the state space approximation is sufficiently accurate and the capture width reaches the maximum in the vicinity of the natural frequency. In the random wave simulations, the effects of buoy size, the PTO damping and wave climate on the power capture width are discussed in detail, which leads to the conclusion that the capture widths are influenced by the natural frequency of the WEC device, peak frequency of the wave spectrum, the amplitude of FRF and PTO damping. Furthermore, the increase of the capture width is at the cost of a relatively large buoy size and PTO damping when control is not included.

关键词： wave energy converter frequency domain time domain power capture width power take-off damping

Evaluation of the Double Snap-Through Mechanism on the wave energy converter’s Performance

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Journal of Marine Science and Application 2021年第2期20卷 268-283页

作者： Bingqi Liu Carlos Levi Segen F.Estefen Zhijia Wu Menglan Duan Ocean Engineering Department COPPEFederal University of Riode JaneiroRio de Janeiro 21945-970Brazil China Ship Scientific Research Center Wuxi 214082China College of Safety and Ocean Engineering China University of Petroleum-BeijingBeijing 102249China

Lower efficiencies induce higher energy costs and pose a barrier to wave energy devices'commercial ***,the efficiency enhancement of wave energy converters has received much attention in recent *** reported research presents the double snap-through mechanism applied to a hemispheric point absorber type wave energy converter(WEC)to improve the energy absorption *** double snap-through mechanism comprises four oblique springs mounted in an *** provides the WEC with different dynamic stability behaviors depending on the particular geometric and physical parameters *** efficiency of these different WEC behaviors(linear,bistable,and tristable)was initially evaluated under the action of regular *** results for bistable or tristable responses indicated significant improvements in the WEC's energy capture ***,the WEC frequency bandwidth was shown to be significantly enlarged when the tristable mode was in ***,the corresponding tristable trajectory showed intra-well behavior in the middle potential well,which induced a more severe low-energy absorption when a small wave amplitude acted on the WEC compared to when the bistable WEC was ***,positive effects were observed when appropriate initial conditions were *** results also showed that for bistable or tristable responses,a suitable spring stiffness may cause the buoy to oscillate in high energy modes.

关键词： wave energy converter Point absorber Double snap-through mechanism Bistable dynamic behavior Tristable dynamic behavior