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Design of offshore wind power Foundation with Multi-bucket

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Transactions of Tianjin University 2016年第6期22卷 502-507页

作者：张浦阳石建超丁红岩郭耀华 State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China Key Laboratory of Coast Civil Structure Safety Ministry of Education Tianjin University Tianjin 300072 China School of Civil Engineering Tianjin University Tianjin 300072 China

Three- and four-bucket offshore wind power foundations with a new form of force-transferring structure are proposed in this paper, and the integrated finite element model of foundation-soil-transition structure is established by using ABAQUS. The carrying capacity of the proposed foundations is studied under vertical load, horizontal load and bending moment. It can be seen that the vertical bearing capacity of multi-bucket foundation can be roughly estimated by the vertical bearing capacity of single-bucket; the horizontal bearing capacity of the three-bucket foundation scheme is controlled by displacement, while that of the four-bucket foundation scheme is controlled by the internal forces of soils. Moreover, the carrying capacity is provided by the overall structure formed by multi-bucket before soil failure. Compared with the conventional single-bucket foundation, there are mainly tension and pressure that are applied to the multi-bucket foundation, so that the carrying capacity of the foundation can be fully utilized. The probability of soil failure can be well reduced with the proposed multi-bucket foundation, and the stress transmission of force-transferring structure is more consistent through steel beams with variable cross-section.

关键词： offshore wind power multi-bucket foundation rotation point force-transferring structure

offshore wind power for Marine Conservation

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Open Journal of Marine Science 2016年第1期6卷 66-78页

作者： Linus Hammar Diana Perry Martin Gullström Department of Energy and Environment Chalmers University of Technology Gothenburg Sweden Department of Ecology Environment and Plant Sciences Stockholm University Stockholm Sweden

The seas of northern Europe are strongly affected by human activities and there is a great need for improved marine conservation. The same region is also the current hotspot for offshore wind power development. wind farms can have negative environmental impacts during construction, but during the operational phase many organisms are attracted to the foundations and thereby may also find refuge from fisheries. Given the recent implementation of marine spatial planning in Europe and elsewhere, this is a critical time to address potential compatibility and synergies between marine conservation and wind power. This review concludes that offshore wind farms can be at least as effective as existing marine protected areas in terms of creating refuges for benthic habitats, benthos, fish and marine mammals. The degree of advantage for these organisms depends on the location of the wind farm and the level of imposed fishing restriction. Under certain conditions wind farms may even be more efficient means of conservation than ordinary marine protected areas. However, offshore wind farms can be negative for several species of seabirds, essentially as occupying preferred feeding or wintering grounds. In areas important to these seabirds wind farms may not comply with conservation. The results bring important messages to marine spatial planning as some but not all wind farms can be spatially combined with, and even synergistic to, marine conservation.

关键词： Marine Conservation offshore wind power Marine Spatial Planning Marine Management

Primary frequency control considering communication delay for grid-connected offshore wind power systems

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Global Energy Interconnection 2024年第3期7卷 241-253页

作者： Xueping Pan Qijie Xu Tao Xu Jinpeng Guo Xiaorong Sun Yuquan Chen Qiang Li Wei Liang School of Electrical and power Engineering Hohai UniversityNanjing 211100P.R.China Electric power Research Institute of State Grid Jiangsu Electric power Co.Ltd Nanjing 211103P.R.China

offshore wind farms are becoming increasingly distant from onshore centralized control centers,and the communication delays between them inevitably introduce time delays in the measurement signal of the primary frequency *** causes a deterioration in the performance of the primary frequency control and,in some cases,may even result in frequency instability within the power ***,a frequency response model that incorporates communication delays was established for power systems that integrate offshore wind *** Padéapproximation was used to model the time delays,and a linearized frequency response model of the power system was derived to investigate the frequency stability under different time *** influences of the wind power proportion and frequency control parameters on the system frequency stability were *** addition,a Smith delay compensation control strategy was devised to mitigate the effects of communication delays on the system frequency ***,a power system incorporating offshore wind power was constructed using the MATLAB/Simulink *** simulation results demonstrate the effectiveness and robustness of the proposed delay compensation control strategy.

关键词： offshore wind power Primary frequency control Time delay Padéapproximation Time-delay compensation control

Study on the Horizontal Movement State of Suction Anchor Piles for offshore wind power during Horizontal Pulling

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World Journal of Engineering and Technology 2022年第1期10卷 88-97页

作者： Jianping Jiang Jiaruo Gao School of Marine Science and Engineering Shanghai Maritime University Shanghai China

The subsea anchor piles of offshore wind power floating platform structures are mainly subjected to uplift and horizontal loads, and this paper focuses on the case of horizontal loads. A three-dimensional numerical simulation study of the horizontal pullout characteristics of wind power suction anchor piles in clay layers was carried out to reveal the horizontal movement state of the anchor piles during horizontal pile pullout, the range of pile depth at the pullout point where the horizontal movement is achieved (referred to as the horizontal movement range), the relationship between the pullout load and the ultimate load during the horizontal movement, and the optimal location of the pullout point for the horizontal movement. The results show that at certain pull-out points, the anchor pile produces an overall horizontal movement state under suitable horizontal pull-out loads. The depth of the pile pull-out point for horizontal movement is in the middle and lower part of the pile, i.e. 14.2 m to 14.5 m. The horizontal pull-out load of 24,000 kN at a depth of 14.5 m within the pile horizontal movement range of 14.2m to 14.5 m is the maximum ultimate horizontal pull-out load;the optimum pull-out point depth is 14.5 m at 0.275 L (L is the pile length). For each pull-out point of the anchor pile in horizontal movement, the horizontal pull-out load in horizontal movement and the horizontal ultimate pull-out load existed and it was found that the two values were not exactly the same, the values were compared and it was found that at the optimum pull-out point the value of the ultimate horizontal pull-out load/horizontal pull-out load in horizontal movement tended to 1.

关键词： Horizontal Movement State Suction Anchor Piles Horizontal Movement Range Optimum Pull-Out Point Depth offshore wind power

Automatic Oxidant Preparation Method for DC Transmission Cooling Systems of offshore wind power Station

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Automatic Oxidant Preparation Method for DC Transmission Coo...

Feasibility analysis and implementation of marine ranching integration of offshore wind power development in Guangdong Province

第43届中国控制会议

作者： Shilong Gao Tao Zhang Yong Yang Qi Li Pengju Qin Anbing Wu State Grid Economic and Technological Research Institute Co. Ltd

This study carries out an automated oxidant preparation method for DC transmission cooling systems of offshore wind power station, with the aim of providing guidance for selecting seaweed prevention devices. offshore platforms usually use electrolysis of seawater to prepare sodium hypochlorite solution, which is injected into the seawater heat exchange system to inhibit the breeding of sea organisms and avoid their derivatives from clogging pipelines and equipment. As important equipment of offshore platforms, seawater lifting pumps are immersed in seawater all year round and are very vulnerable to seaweed erosion. Sea life will not only corrode the seawater lifting pump itself but also cause harm to pumping pipelines, valves,filters, coolers and other equipment, reducing the service life of the equipment and affecting the overall operational efficiency of the platform. Therefore, it is crucial to install seawater lifting pumps with seaweed prevention devices. This study focuses on the sodium hypochlorite anti-seabiosis device applied in the cooling system of offshore platforms, analyses its dosing position and corrosion, and puts forward optimization suggestions. The results show that optimizing the dosing position and anti-corrosion measures can improve the effectiveness and provide a guarantee for the safe and efficient operation of offshore platforms.

关键词： Automatic Preparation offshore wind power Flexible DC Transmission Control Strategies Cooling systems

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Marine Science Bulletin 2021年第2期23卷 57-72页

作者： CHEN Hao LU Chuqian CHEN Bin South China Sea Environment Monitoring Center State Oceanic AdministrationGuangzhou 510300Guangdong provinceChina

Marine ranching is a new model for restoring marine ecological environment and conserving offshore fishery *** wind power is a new clean energy industry in *** on the analysis of the construction of offshore wind farms in Guangdong Province,this article proposes to actively promote the integrated development of offshore wind power and marine *** suitability and deployment conditions of Sargasso algae reef construction in offshore wind farms,the feasibility of developing an integrated development model featuring artificial algae reefs+offshore wind farms in Guangdong Province,as well as the importance of ecological sea area use and management were *** the necessity of intensive and economical utilization of sea and sea resources,it is believed that the development model of"marine ranching+offshore wind power"will become an important direction for improving the comprehensive utilization of sea areas in the future.

关键词： marine ranching offshore wind power ecological restoration artificial algae reef

Stability Study on the Bucket Foundation with Multi-Compartment During the Floating-up Process Considering Air Compressibility

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China Ocean Engineering 2023年第6期37卷 975-988页

作者： YE Fang-di LIAN Ji-jian GUO Yao-hua WANG Hai-jun XIAO Tian-run XIONG Dong-zhi YU Tong-shun State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Tianjin University of Technology Tianjin 300384China College of Engineering Ocean University of ChinaQingdao 266100China

In the process of developing offshore wind power towards deeper waters,the advantages of the bucket foundation in terms of integrated construction and economy are becoming increasingly *** contrast to conventional floating bodies,the air-floating bucket foundations can achieve self-floating with the help of the air in the compartment and adjust its buoyancy and stability by controlling the air volume in the *** construction process of the bucket foundation involves the control of air in the compartment,thus making it more difficult to *** after the prefabrication of the bucket foundation,the stability of the bucket foundation at the floating-up stage is particularly *** stability of a multi-compartment bucket foundation during the floating-up process cannot be accurately evaluated as the existing theoretical method of air-floating structures does not adequately consider air *** ensure the safety of the floating-up process,a theoretical method based on the idea of intact stability has been developed to analyze the stability of the air-floating bucket foundations,which will allow accurate calculation of the righting arm for different tilt states and critical air leakage *** the same time,accuracy and feasibility of the proposed theoretical method are verified through indoor model tests and practical operation of the prototype structure during the floating-up *** addition,measures to enhance the stability of the bucket foundation are proposed through sensitivity analysis of influencing factors.

关键词： offshore wind power bucket foundation air-floating structure stability

Undrained Capacity of a Bucket Foundation with a Limited-Tension Interface for offshore wind Turbines

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Journal of Ocean University of China 2024年第6期23卷 1391-1408页

作者： WANG Jiayu LI Bin LIU Run YANG Xu LIANG Chao Institute of Ocean Energy and Intelligent Construction Tianjin University of TechnologyTianjin 300384China State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China Tianjin Port Engineering Institute Ltd.of CCCC First Harbor Engineering Company Ltd. Tianjin 300222China CCCC First Harbor Engineering Company Ltd. Tianjin 300461China

In this paper,the influence of the limited-tension interface between lid and soil on the undrained bearing capacity of the wide-shallow bucket foundation is examined by finite element(FE)*** interface between the lid and the soil is modeled using a simplified approach called the surface-based cohesive behavior,with the aim of simulating the limited-tension ***,the interaction between the lid and the soil is explored under the zero-and unlimited-tension conditions by small-scale ***,the effects of the embedment ratio,soil strength heterogeneity,and lid-soil interface on the bearing capacity are outlined,and the failure mechanisms are explained by FE analysis.A modified closed-form formula is given to compute the moment bearing capacity with the limited-tension interface between the lid and the soil for different embedment ratios and soil strength *** numerical results reveal that the existing approximating solutions,which assume fully bonded interaction,accurately exhibit the shape of the normalized failure envelopes in hm and vh load space for the limited-tension ***,the shape of the vm envelopes differs,requiring a novel solution to estimate the combined bearing capacity of the bucket foundation based on the embedment ratio and soil strength heterogeneity with a zero-tension interface between the lid and the soil.

关键词： offshore wind power bucket foundation limited-tension interface ultimate bearing capacity finite element modeling

Research on the Critical Buckling Pressure of Bucket Foundations with Inner Compartments for offshore wind Turbines

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Journal of Ocean University of China 2023年第2期22卷 419-428页

作者： SUN Guodong LIU Run LI Qingxin HUANG Guoyu ZHOU Zhenbo ZHANG Cheng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Southern offshore wind power Joint Development Co. Ltd.Zhuhai 519080China Changjiang Survey Planning Design and Research Co. Ltd.Wuhan 430010China

In the process of suction penetration of bucket foundations with inner compartments for offshore wind turbines,most researches focus on soil seepage failure and soil plugs,while the buckling of foundations is rarely ***,theoretical calculation methods for critical buckling pressures of the skirt and bulkheads of the bucket foundation are first presented according to the stability theory of a cylindrical shell and the small deflection theory of a thin plate,***,two types of models with and without considering the skirt-soil interaction are developed for the calculation of critical buckling pressure of the bucket *** a practical project as an example,theoretical and numerical methods are used to obtain the critical buckling pressures of a bucket *** this work,the theoretical method and the finite element model considering the skirt-soil interaction for calculating the critical buckling pressure of bucket foundations are firstly *** results can help to optimize the design process of offshore wind turbine foundations and improve the safety of offshore wind power systems.

关键词： offshore wind power bucket foundation suction penetration critical buckling pressure