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Movement pattern of red seabream Pagrus major and yellowtail Seriola quinqueradiata around offshore wind turbine and the neighboring habitats in the waters near Goto Islands, Japan

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Aquaculture and Fisheries 2021年第3期6卷 300-308页

作者： Khyria Swaleh Karama Yoshiki Matsushita Masahiro Inoue Kenta Kojima Kazuki Tone Itsumi Nakamura Ryo Kawabe Graduate School of Fisheries and Environmental Sciences Nagasaki UniversityNagasaki852-8521Japan Kenya Marine and Fisheries Research Institute P.O.Box81651-80100Mombasa20100Kenya Organization for Marine Science and Technology Nagasaki UniversityNagasaki852-8521Japan Nagasaki Branch Fisheries Infrastructure Development CenterNagasaki850-0035Japan Faculty of Fisheries Nagasaki UniversityNagasaki852-8521Japan Institute for East China Sea Research Organization for Marine Science and TechnologyNagasaki UniversityNagasaki851-2213Japan

We investigated movement pattern of commercial important fish around offshore wind turbine(OWT)and neighboring habitats in Goto Islands.We tagged 55 individuals of 2 fish species and released around the OWT in 2017.(27 Pagrus major from 1st Feb 2017 to 16th Mar 2017(winter),8 P.major and 20 Seriola quinqueradiata from 13th July 2017 to 13th Oct 2017(summer)).Acoustic receivers were deployed at OWT,south artificial reef(AS),trapnet(TN),north FAD(F1)and south FAD(F2)in winter and two more receivers were deployed at north artificial reef(AN)and natural reef(NR)in summer.We observed 12 P.major at OWT for a day after released in winter,majority of fish(13 individuals)were detected at TN.In summer,7 P.major were observed at OWT,1 visited TN within the day,but others disappeared.Ten S.quinqueradiata stayed at OWT longer than P.major after released and disappeared within 2 days.They mostly moved around AS,AN,NR.Residence time from K-M curve was 10 days for P.major in winter,a day in summer and 3 days for S.quinqueradiata.Both species showed low affinity for OWT as recorded low residency index despite the season.

关键词： Biotelemetry Habitat usage offshore wind turbine Red seabream Pagrus major Yellowtail Seriola quinqueradiata

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Passive structural control with inerters for a floating offshore wind turbine

Passive structural control with inerters for a floating offs...

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第36届中国控制会议

作者： Yinlong Hu Michael Z.Q.Chen College of Energy and Electrical Engineering Hohai University School of Automation Nanjing University of Science and Technology

ISBN: (纸本)9781538629185

This paper investigates an inerter-based passive structural control problem for a floating offshore wind turbine to reduce the loads induced by wind and wave.The proposed inerter-based system is composed of a passive spring,a damper,and a parallel-connected passive network.A parameter tuning method by maximizing the minimal modal damping of a linear design model is proposed,and the nonlinear wind turbine simulation code FAST-SC is employed.Numerical simulations are conducted to show the effectiveness and the performance benefits of the proposed inerter-based structural control system.It is shown that the proposed inerter-based system can effectively reduce the wind-and wave-induced loads compared with the conventional spring-damper system.

关键词： Inerter offshore wind turbine floating platform FAST inerter-based dynamic vibration absorber（IDVA）

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Structural control for a barge-type floating offshore wind turbine with a skyhook inerter configuration

Structural control for a barge-type floating offshore wind t...

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第32届中国控制与决策会议

作者： Yinlong Hu Jianing Wang Zhaoyan Wang Michael Z.Q.Chen College of Energy and Electrical Engineering Hohai University School of Automation Nanjing University of Science and Technology

This paper studies the wind and wave-induced structural load mitigation problem for a floating offshore wind turbine with a barge platform,where a tuned mass damper(TMD) with a skyhook inerter configuration is employed.The skyhook inerter is intended to virtually increase the mass of the TMD,which will be demonstrated that the structural loads can be effectively reduced by increasing the mass of the TMD.Numerical simulations demonstrate that the application of a skyhook inerter system can reduce the load of a barge-type floating offshore wind turbine to some extent.Semi-active inerters are adopted to realize the skyhook inerter configuration,where two control laws,that is the on-off control and the continuous control,are applied for the semi-active inerter to approximate the skyhook inerter.However,the improvement of overall performance is not significant in numerical simulations,indicating that although the ideal skyhook inerter can effectively improve the performance for the floating offshore wind turbine,its semi-active realizations by using semi-active inerter in associated with the on-off control and the continuous control have very limited performance improvement.

关键词： Inerter Skyhook control offshore wind turbine Semi-active control Tuned mass damper

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Evaluating effectiveness of multiple tuned mass dampers for vibration control of jacket offshore wind turbines under onshore and seafloor earthquakes

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 1045-1063页

作者： Pan Zuxing Liu Yingzhou Wang Wenhua Li Xin Zhao Shengxiao Jiang Zhenqiang Shang Jin Renewable Energy Engineering Institute Power China Huadong Engineering Corporation LimitedHangzhou 311122China State Key Laboratory of Coastal and offshore Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China Institute of Earthquake Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China School of Civil Engineering and Architecture Guangxi University for NationalitiesNanning 530006China

The dynamic characteristics and structural responses of operation and grid loss offshore wind turbines(OWTs)under onshore and seafloor earthquakes are analyzed based on the established coupled seismic analysis model.In addition to the remarkable influence of the rotor system on the responses of the operation OWT under earthquakes,interactions among the natural modes of the grid loss OWT in the fore-aft and side-to-side directions are revealed.By comparing with the onshore earthquakes,the more significant differences of structural response are observed under the selected seafloor earthquakes,due to the longer duration and more abundant energy distribution around the natural frequencies of OWT.Concurrently,a multiple tuned mass damper(MTMD)is designed and applied to the operation and grid loss OWTs.Then,the comparisons of the mitigation effects under onshore and seafloor ground motions are carried out,and the necessity of applying seafloor ground motions to OWTs are proved.Moreover,in comparison to the operation OWT,more effective reductions are observed for the grid loss OWT under onshore and seafloor earthquakes using the designed MTMD.Therefore,the combined shutdown procedures and MTMD vibration control strategy is suggested for OWTs under earthquakes.

关键词： offshore wind turbine earthquake vibration control coupled analysis MTMD

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Comparison of Pile-Soil-Structure Interaction Modeling Techniques for A 10-MW Large-Scale Monopile wind turbine Model Under wind and Wave Conditions

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China Ocean Engineering 2023年第3期37卷 471-483页

作者： ZENG Yu-xin ZHANG Xiao-ming ZHANG Li-xian SHI Wei WANG Wen-hua LI Xin Hunan Provincial Key Laboratory of Key Technology on Hydropower Development Changsha 410014China PowerChina Zhongnan Engineering Corporation Limited Changsha 410021China State Key Laboratory of Coastal and offshore Engineering Dalian University of TechnologyDalian 116024China DeepWater Engineering Research Centre Dalian University of TechnologyDalian 116024China Institute for Earthquake Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China

Considering the large diameter effect of piles,the influence of different pile-soil analysis methods on the design of monopile foundations for offshore wind turbines has become an urgent problem to be solved.Three different pile-soil models were used to study a large 10 MW monopile wind turbine.By modeling the three models in the SACS software,this paper analyzed the motion response of the overall structure under the conditions of wind and waves.According to the given working conditions,this paper concludes that under the condition of independent wind,the average value of the tower top x-displacement of the rigid connection method is the smalle st,and the standard deviation is the smallest under the condition of independent wave.The results obtained by the p-y curve method are the most conservative.

关键词： large-scale monopile offshore wind turbine pile-soil model wind-wave load combination

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Hydrodynamic Characteristics of Three-Bucket Jacket Foundation for offshore wind turbines During the Lowering Process

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China Ocean Engineering 2023年第1期37卷 73-84页

作者： ZHANG Pu-yang QI Xin WEI Yu-mo ZHANG Sheng-wei LE Cong-huan DING Hong-yan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

The three-bucket jacket foundation is a new type of foundation for offshore wind turbine that has the advantages of fast construction speed and suitability for deep water. The study of the hoisting and launching process is of great significance to ensure construction safety in actual projects. In this paper, a new launching technology is proposed that is based on the foundation of the three-bucket jacket for offshore wind turbine. A complete time domain simulation of the launching process of three-bucket jacket foundation is carried out by a theoretical analysis combined with hydrodynamic software Moses. At the same time, the effects of different initial air storage and sea conditions on the motion response of the structure and the hoisting cable tension are studied. The results show that the motion response of the structure is the highest when it is lowered to 1.5 times the bucket height. The natural period of each degree of freedom of the structure increases with the increase of the lowering depth. The structural motion response and the hoisting cable tension vary greatly in the early phases of Stages Ⅰ and Ⅲ, smaller in Stage Ⅱ, and gradually stabilize in the middle and late phases of Stage Ⅲ.

关键词： three-bucket jacket foundation time domain simulation hoisting construction motion response offshore wind turbine

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Jointly improving energy efficiency and smoothing power oscillations of integrated offshore wind and photovoltaic power: a deep reinforcement learning approach

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Protection and Control of Modern Power Systems 2023年第2期8卷 156-166页

作者： Xiuxing Yin Meizhen Lei The State Key Laboratory of Water Resources Engineering and Management Wuhan UniversityWuhan 430072HubeiChina The School of Information Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China

This paper proposes a novel deep reinforcement learning(DRL)control strategy for an integrated offshore wind and photovoltaic(PV)power system for improving power generation efficiency while simultaneously damping oscilla-tions.A variable-speed offshore wind turbine(OWT)with electrical torque control is used in the integrated offshore power system whose dynamic models are detailed.By considering the control system as a partially-observable Markov decision process,an actor-critic architecture model-free DRL algorithm,namely,deep deterministic policy gradient,is adopted and implemented to explore and learn the optimal multi-objective control policy.The potential and effectiveness of the integrated power system are evaluated.The results imply that an OWT can respond quickly to sudden changes of the inflow wind conditions to maximize total power generation.Significant oscillations in the overall power output can also be well suppressed by regulating the generator torque,which further indicates that complementary operation of offshore wind and PV power can be achieved.

关键词： offshore wind turbine offshore photovoltaic power Deep reinforcement learning Deep deterministic policy gradient Multi-objective optimal control

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Application of Converted Displacement for Modal Parameter Identification of offshore wind turbines with High-Pile Foundation

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Journal of Ocean University of China 2022年第6期21卷 1467-1478页

作者： LI Ying WANG Bin LIU Qiang GAO Shan LU Sujie Chinese-German Institute of Engineering Zhejiang University of Science and TechnologyHangzhou 310023China Key Laboratory of Far-Shore wind Power Technology of Zhejiang Province Hangzhou 311122China PowerChina Huadong Engineering Corporation Limited Hangzhou 311122China Zhejiang Huadong Mapping and Engineering Safety Technology Co. Ltd.Hangzhou 310014China

In the actual measurement of offshore wind turbines(OWTs),the measured accelerations usually contain a large amount of noise due to the complex and harsh marine environment,which is not conducive to the identification of structural modal parameters.For OWTs with remarkably low structural modal frequencies,displacements can effectively suppress the high-frequency vibration noise and amplify the low-frequency vibration of the structure.However,finding a reference point to measure structural displacements at sea is difficult.Therefore,only a few studies on the use of dynamic displacements to identify the modal parameters of OWTs with high-pile foundations are available.Hence,this paper develops a displacement conversion strategy to study the modal parameter identification of OWTs with high-pile foundations.The developed strategy can be divided into the following three parts:zero-order correction of measured acceleration,high-pass filtering by the Butterworth polynomial,and modal parameter identification using the calculated displacement.The superiority of the proposed strategy is verified by analyzing a numerical OWT with a high-pile foundation and the measured accelerations from an OWT with a high-pile foundation.The results show that for OWTs with high-pile foundations dominated by low frequencies,the developed strategy of converting accelerations into displacements and then performing modal parameter identification is advantageous to the identification of modal parameters,and the results have high accuracy.

关键词： offshore wind turbine high-pile foundation modal parameter identification baseline drift low-frequency noise

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Experiment Study of Dynamics Response for wind turbine System of Floating Foundation

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China Ocean Engineering 2015年第6期29卷 835-846页

作者：唐友刚宋凯王宾 State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil EngineeringTianjin University

The floating foundation is designed to support a 1.5 MW wind turbine in 30 m water depth. With consideration of the viscous damping of foundation and heave plates, the amplitude-frequency response characteristics of the foundation are studied. By taking into account the elastic effect of blades and tower, the classic quasi-steady blade-element/momentum（BEM） theory is used to calculate the aerodynamic elastic loads. A coupled dynamic model of the turbine-foundationmooring lines is established to calculate the motion response of floating foundation under Kaimal wind spectrum and regular wave by using the FAST codes. The model experiment is carried out to test damping characteristics and natural motion behaviors of the wind turbine system. The dynamics response is tested by considering only waves and the joint action of wind and waves. It is shown that the wind turbine system can avoid resonances under the action of wind and waves. In addition, the heave motion of the floating foundation is induced by waves and the surge motion is induced by wind. The action of wind and waves is of significance for pitch.

关键词： offshore wind turbine semi-submersible floating foundation coupled dynamic model model experiment

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wind Farm Support Vessel Extreme Roll Assessment While Docking in the Bohai Sea

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China Ocean Engineering 2021年第2期35卷 308-316页

作者： XU Xiao-sen Oleg Gaidai Oleh Karpa WANG Jun-lei YE Ren-chuan CHENG Yong Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212100China School of Naval Architeture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China EPAM Systems Ukraine School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

Robust prediction of extreme motions during wind farm support vessel(WFSV)operation is an important safety concern that requires further extensive research as offshore wind energy industry sector widens.In particular,it is important to study the safety of operation in random sea conditions during WFSV docking against the wind tower,while workers are able to get on the tower.Docking is performed by thrusting vessel fender against wind tower(an alternative docking way by hinging is not studied here).In this paper,the finite element software AQWA has been used to analyze vessel response due to hydrodynamic wave loads,acting on a specific maintenance ship under actual sea conditions.Excessive roll may occur during certain sea conditions,especially in the beam sea,posing a risk to the crew transfer operation.The Bohai Sea is the area of diverse industrial activities such as offshore oil production,wave and wind power generation,etc.This paper advocates a novel method for estimating extreme roll statistics,based on Monte Carlo simulations(or measurements).The ACER(averaged conditional exceedance rate)method and its modification are presented in brief detail in Appendix.The proposed methodology provides an accurate extreme value prediction,utilizing available data efficiently.In this study the estimated return level values,obtained by ACER method,are compared with the corresponding return level values obtained by Gumbel method.Based on the overall performance of the proposed method,it is concluded that the ACER method can provide more robust and accurate prediction of the extreme vessel roll.The described approach may be well used at the vessel design stage,while defining optimal boat parameters would minimize potential roll.

关键词： wind farm support vessel(WFSV) docking Monte Carlo extreme roll Gumbel distribution offshore wind turbine wind energy Bohai Sea

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