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Primary frequency control considering communication delay for grid-connected offshore wind power systems
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作者 Xueping Pan Qijie Xu +5 位作者 Tao Xu Jinpeng Guo Xiaorong Sun Yuquan Chen Qiang Li Wei Liang 《Global Energy Interconnection》 EI CSCD 2024年第3期241-253,共13页
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 freque... 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 control.This causes a deterioration in the performance of the primary frequency control and,in some cases,may even result in frequency instability within the power system.Therefore,a frequency response model that incorporates communication delays was established for power systems that integrate offshore wind power.The 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 delays.The influences of the wind power proportion and frequency control parameters on the system frequency stability were explored.In addition,a Smith delay compensation control strategy was devised to mitigate the effects of communication delays on the system frequency dynamics.Finally,a power system incorporating offshore wind power was constructed using the MATLAB/Simulink platform.The simulation results demonstrate the effectiveness and robustness of the proposed delay compensation control strategy. 展开更多
关键词 offshore wind power Primary frequency control Time delay Padéapproximation Time-delay compensation control
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Offshore Wind Power Evaluation Based on Nearshore Wind Power Correlations
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作者 Hsin-Chih Fang Chien-Cheng Tu +1 位作者 Chao-Hong Lu Ta-Hui Lin 《Journal of Mechanics Engineering and Automation》 2021年第5期135-148,共14页
As the increasing number of wind energy is integrated into the national power grid,analyses of wind energy are becoming increasingly more crucial.The interaction between the topography and the northeast(NE)monsoon bri... As the increasing number of wind energy is integrated into the national power grid,analyses of wind energy are becoming increasingly more crucial.The interaction between the topography and the northeast(NE)monsoon brings abundant wind resources to the Taiwan Strait in autumn and winter.The offshore area has stronger and more stable wind resources,so deployment of offshore wind power is also actively being carried out.However,development of offshore wind power systems requires stricter evaluation and decision-making.Therefore,this study implements a multi-site measurement verification to establish the relationship between the wind resources of the nearshore wind turbine system and a potential offshore power site in Chanbin.In the absence of a wind turbine at a specific location,potential of offshore wind energy is analyzed through wind resources.The findings showed that although the distance between these two sites is substantial,the nearshore and offshore areas at Chanbin experience similar wind conditions,and nearshore wind turbine can respond well to changes in wind speed and generate power accordingly.Afterwards,on this basis,the offshore power potential was evaluated and compared with the nearshore wind turbine systems.The results suggested the advantages of offshore wind power.A further analysis of the differences between power generation on a monthly basis was carried out to determine the distribution of wind turbine operation modes and illustrate the influence of the NE monsoon. 展开更多
关键词 Chanbin nearshore wind turbine system offshore power potential assessment NE monsoon operation mode
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Design of Offshore Wind Power Foundation with Multi-bucket 被引量:7
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作者 张浦阳 石建超 +1 位作者 丁红岩 郭耀华 《Transactions of Tianjin University》 EI CAS 2016年第6期502-507,共6页
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 est... 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. 展开更多
关键词 offshore wind power multi-bucket foundation rotation point force-transferring structure
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Offshore Wind Power for Marine Conservation 被引量:1
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作者 Linus Hammar Diana Perry Martin Gullström 《Open Journal of Marine Science》 2016年第1期66-78,共13页
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 f... 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. 展开更多
关键词 Marine Conservation offshore Wind power Marine Spatial Planning Marine Management
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Study on the Horizontal Movement State of Suction Anchor Piles for Offshore Wind Power during Horizontal Pulling 被引量:1
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作者 Jianping Jiang Jiaruo Gao 《World Journal of Engineering and Technology》 2022年第1期88-97,共10页
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 si... 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. 展开更多
关键词 Horizontal Movement State Suction Anchor Piles Horizontal Movement Range Optimum Pull-Out Point Depth offshore Wind power
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Capacity Optimization Configuration of Hydrogen Production System for Offshore Surplus Wind Power
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作者 Yanshan Lu Binbin He +6 位作者 Jun Jiang Ruixiao Lin Xinzhen Zhang Zaimin Yang Zhi Rao Wenchuan Meng Siyang Sun 《Energy Engineering》 EI 2023年第12期2803-2818,共16页
To solve the problem of residual wind power in offshore wind farms,a hydrogen production system with a reasonable capacity was configured to enhance the local load of wind farms and promote the local consumption of re... To solve the problem of residual wind power in offshore wind farms,a hydrogen production system with a reasonable capacity was configured to enhance the local load of wind farms and promote the local consumption of residual wind power.By studying the mathematical model of wind power output and calculating surplus wind power,as well as considering the hydrogen production/storage characteristics of the electrolyzer and hydrogen storage tank,an innovative capacity optimization allocation model was established.The objective of the model was to achieve the lowest total net present value over the entire life cycle.The model took into account the cost-benefit breakdown of equipment end-of-life cost,replacement cost,residual value gain,wind abandonment penalty,hydrogen transportation,and environmental value.The MATLAB-based platform invoked the CPLEX commercial solver to solve the model.Combined with the analysis of the annual average wind speed data from an offshore wind farm in Guangdong Province,the optimal capacity configuration results and the actual operation of the hydrogen production system were obtained.Under the calculation scenario,this hydrogen production system could consume 3,800 MWh of residual electricity from offshore wind power each year.It could achieve complete consumption of residual electricity from wind power without incurring the penalty cost of wind power.Additionally,it could produce 66,500 kg of green hydrogen from wind power,resulting in hydrogen sales revenue of 3.63 million RMB.It would also reduce pollutant emissions from coal-based hydrogen production by 1.5 tons and realize an environmental value of 4.83 million RMB.The annual net operating income exceeded 6 million RMB and the whole life cycle NPV income exceeded 50 million RMB.These results verified the feasibility and rationality of the established capacity optimization allocation model.The model could help advance power system planning and operation research and assist offshore wind farm operators in improving economic and environmental benefits. 展开更多
关键词 Surplus wind power offshore wind power hydrogen generation capacity optimization configuration total net present cost
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Feasibility analysis and implementation of marine ranching integration of offshore wind power development in Guangdong Province
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作者 CHEN Hao LU Chuqian CHEN Bin 《Marine Science Bulletin》 2021年第2期57-72,共16页
Marine ranching is a new model for restoring marine ecological environment and conserving offshore fishery resources.Offshore wind power is a new clean energy industry in China.Based on the analysis of the constructio... Marine ranching is a new model for restoring marine ecological environment and conserving offshore fishery resources.Offshore wind power is a new clean energy industry in China.Based 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 ranching.The 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 discussed.Regarding 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. 展开更多
关键词 marine ranching offshore wind power ecological restoration artificial algae reef
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Offshore wind power projects set sail
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作者 Liu Chunsheng 《Electricity》 2010年第2期8-,共1页
China will choose the sea off eastern Jiangsu Province to build the country’s first batch of offshore wind power projects. The four
关键词 WILL offshore wind power projects set sail
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Design and Evaluation Tool for Operations and Maintenance Logistics Concepts for Offshore Wind Power Plants
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作者 Torsten Mansterberg Robert Rauer Carlos Jahn 《Journal of Energy and Power Engineering》 2013年第11期2054-2059,共6页
In this article, the authors give an overview of different logistics concepts for operation and maintenance of OWPP (offshore wind power plants). These can be generally classified into onshore based and offshore bas... In this article, the authors give an overview of different logistics concepts for operation and maintenance of OWPP (offshore wind power plants). These can be generally classified into onshore based and offshore based concepts. The operation of OWPPs can still be improved as research has shown that the availability of OWPPs is low compared to onshore wind power plants. There are a few tools to calculate operating costs and to evaluate the different concepts. However, most tools have a weak focus on logistics although logistics account for a big share of the costs. The tool the authors are introducing in this article focuses on the logistics processes. It is first explained and then tested with an OWPP scenarin 展开更多
关键词 offshore wind energy offshore wind power plants operations and maintenance logistics concepts design and evaluationtool simulation.
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Design of Large-Scale Prestressing Bucket Foundation for Offshore Wind Turbines 被引量:25
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作者 练继建 丁红岩 +1 位作者 张浦阳 于瑞 《Transactions of Tianjin University》 EI CAS 2012年第2期79-84,共6页
The key in the force transmission between the tower and the foundation for offshore wind turbines is to transfer the large moment and horizontal loads. The finite element model of a large-scale prestressing bucket fou... The key in the force transmission between the tower and the foundation for offshore wind turbines is to transfer the large moment and horizontal loads. The finite element model of a large-scale prestressing bucket founda- tion for offshore wind turbines is set up and the structural characteristics of the arc transition structure of the founda- tion are analyzed for 40-60 channels(20-30 rows) arranged with prestressing steel strand under the same ultimate load and boundary conditions. The mechanical characteristics of the key parts of the foundation structures are illus- trated by the peak of the principal tensile stress, the peak of the principal compressive stress and the distribution areas where the principal tensile stress is larger than 2.00 MPa. It can be concluded that the maximum principal tensile stress of the arc transition decreases with the increasing number of channels, and the amplitude does not change signifi- cantly; the maximum principal compressive stress increases with the increasing number of channels and the amplitude changes significantly; however, for the distribution areas where the principal tensile stress is larger than 2.00 MPa, with different channel numbers, the phenomenon is not obvious. Furthermore, the principal tensile stress at the top of the foundation beams fluctuantly increases with the increasing number of channels and for the top cover of the bucket, the principal tensile stress decreases with the increasing number of channels. 展开更多
关键词 offshore wind power large-scale prestressing bucket foundation arc transition structural design
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Research on the Critical Buckling Pressure of Bucket Foundations with Inner Compartments for Offshore Wind Turbines
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作者 SUN Guodong LIU Run +3 位作者 LI Qingxin HUANG Guoyu ZHOU Zhenbo ZHANG Cheng 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第2期419-428,共10页
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 i... 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 investigated.Therefore,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,respectively.Furthermore,two types of models with and without considering the skirt-soil interaction are developed for the calculation of critical buckling pressure of the bucket foundation.Taking a practical project as an example,theoretical and numerical methods are used to obtain the critical buckling pressures of a bucket foundation.In 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 proposed.The results can help to optimize the design process of offshore wind turbine foundations and improve the safety of offshore wind power systems. 展开更多
关键词 offshore wind power bucket foundation suction penetration critical buckling pressure
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European Offshore Wind Gravity Foundation
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作者 LI Lei GUO Peijun LYU Tao 《International Journal of Plant Engineering and Management》 2022年第1期53-64,共12页
The development history of the offshore wind gravity foundation in Europe is briefly introduced.Sumnarized in which the equipment relates to offshore wind power installation,including ships and special equipment relat... The development history of the offshore wind gravity foundation in Europe is briefly introduced.Sumnarized in which the equipment relates to offshore wind power installation,including ships and special equipment related to wind power installation.And the installation method and technology of gravity foundation are analyzed.The development trend of the offshore wind power gravity foundation is put forward. 展开更多
关键词 offshore wind power bottom fixed foundation installation technology offshore installation vessel marine equipment
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Life-cycle Assessment of Carbon Dioxide Capture for Enhanced Oil Recovery 被引量:4
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作者 Edgar G. Hertwich Martin Aaberg +1 位作者 Bhawna Singh Anders H. StrФmman 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第3期343-353,共11页
The development and deployment of Carbon dioxide Capture and Storage (CCS) technology is a cornerstone of the Norwegian government's climate strategy. A number of projects are currently evaluated/planned along the ... The development and deployment of Carbon dioxide Capture and Storage (CCS) technology is a cornerstone of the Norwegian government's climate strategy. A number of projects are currently evaluated/planned along the Norwegian West Coast, one at Tjeldbergodden. COe from this project will be utilized in part for enhanced oil recovery in the Halten oil field, in the Norwegian Sea. We study a potential design of such a system. A combined cycle power plant with a gross power output of 832 MW is combined with CO2 capture plant based on a post-combustion capture using amines as a solvent. The captured CO2 is used for enhanced oil recovery (EOR). We employ a hybrid life-cycle assessment (LCA) method to assess the environmental impacts of the system. The study focuses on the modifications and operations of the platform during EOR. We allocate the impacts connected to the capture of CO2 to electricity production, and the impacts connected to the transport and storage of CO2 to the oil produced. Our study shows a substantial reduction of the greenhouse gas emissions from power production by 80% to 75 g·(kW·h)^-1. It also indicates a reduction of the emissions associated with oil production per unit oil produced, mostly due to the increased oil production. Reductions are especially significant if the additional power demand due to EOR leads to power supply from the land. 展开更多
关键词 carbon dioxide capture and storage enhanced oil recovery offshore power supply life-cycle analysis
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Undrained Capacity of a Bucket Foundation with a Limited-Tension Interface for Offshore Wind Turbines
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作者 WANG Jiayu LI Bin +2 位作者 LIU Run YANG Xu LIANG Chao 《Journal of Ocean University of China》 SCIE CAS 2024年第6期1391-1408,共18页
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)analysis.The interface between... 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)analysis.The 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 interface.Initially,the interaction between the lid and the soil is explored under the zero-and unlimited-tension conditions by small-scale experiments.Afterward,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 heterogeneities.The 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 interface.However,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. 展开更多
关键词 offshore wind power bucket foundation limited-tension interface ultimate bearing capacity finite element modeling
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Power hardware in the loop validation of fault ride through of VSC HVDC connected offshore wind power plants 被引量:26
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作者 Ranjan SHARMA Qiuwei WU +3 位作者 Seung Tae CHA Kim H.JENSEN Tonny W.RASMUSSEN JacobØSTEGAARD 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2014年第1期23-29,共7页
This paper presents the power hardware in the loop(PHIL)validation of a feed forward DC voltage control scheme for the fault ride through(FRT)of voltage source converter(VSC)high voltage DC(HVDC)connected offshore win... This paper presents the power hardware in the loop(PHIL)validation of a feed forward DC voltage control scheme for the fault ride through(FRT)of voltage source converter(VSC)high voltage DC(HVDC)connected offshore wind power plants(WPPs).In the proposed FRT scheme,the WPP collector network AC voltage is actively controlled by considering both the DC voltage error and the AC current from the WPP AC collector system which ensures fast and robust FRT of the VSC HVDC connected offshore WPPs.The PHIL tests were carried out in order to verify the efficacy of the proposed feed forward DC voltage control scheme for enhancing the FRT capability of the VSC HVDC connected WPPs.The PHIL test results have demonstrated the proper control coordination between the offshore WPP and the WPP side VSC and the efficient FRT of the VSC HVDC connected WPPs. 展开更多
关键词 Fault ride through High voltage DC(HVDC) offshore wind power plant power hardware in the loop(PHIL) Voltage source converter(VSC)
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Integrated generation-transmission expansion planning for offshore oilfield power systems based on genetic Tabu hybrid algorithm 被引量:8
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作者 Dawei SUN Xiaorong XIE +2 位作者 Jianfeng WANG Qiang LI Che WEI 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2017年第1期117-125,共9页
To address the planning issue of offshore oil-field power systems, an integrated generation-transmission expansion planning model is proposed. The outage cost is considered and the genetic Tabu hybrid algorithm(GTHA)i... To address the planning issue of offshore oil-field power systems, an integrated generation-transmission expansion planning model is proposed. The outage cost is considered and the genetic Tabu hybrid algorithm(GTHA)is developed to find the optimal solution. With the proposed integrated model, the planning of generators and transmission lines can be worked out simultaneously,which outweighs the disadvantages of separate planning,for instance, unable to consider the influence of power grid during the planning of generation, or insufficient to plan the transmission system without enough information of generation. The integrated planning model takes into account both the outage cost and the shipping cost, which makes the model more practical for offshore oilfield power systems. The planning problem formulated based on the proposed model is a mixed integer nonlinear programming problem of very high computational complexity, which is difficult to solve by regular mathematical methods. A comprehensive optimization method based on GTHA is also developed to search the best solution efficiently.Finally, a case study on the planning of a 50-bus offshore oilfield power system is conducted, and the obtained results fully demonstrate the effectiveness of the presented model and method. 展开更多
关键词 offshore oil field power system Generation expansion planning Transmission expansion planning Genetic Tabu hybrid algorithm
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Coupled Time-Domain Investigation on a Vertical Axis Wind Turbine Supported on a Floating Platform 被引量:1
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作者 CUI Jianhui ZHAI Yongjian +2 位作者 GUO Ying DENG Wanru LIU Liqin 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第2期365-376,共12页
The dynamic responses of a floating vertical axis wind turbine(VAWT)are assessed on the basis of an aero-hydro-mooring coupled model.The aerodynamic loads on the rotor are acquired with double-multiple stream tube met... The dynamic responses of a floating vertical axis wind turbine(VAWT)are assessed on the basis of an aero-hydro-mooring coupled model.The aerodynamic loads on the rotor are acquired with double-multiple stream tube method.First-and second-order wave loads are calculated on the basis of 3D potential theory.The mooring loads are simulated by catenary theory.The coupled model is established,and a numerical code is programmed to investigate the dynamic response of the semi-submersible VAWT.A model test is then conducted,and the numerical code is validated considering the hydrodynamic performance of the floating buoy.The responses of the floating VAWT are studied through the numerical simulation under the sea states of wind and regular/irregular waves.The effects of the second-order wave force on the motions are also investigated.Results show that the slow-drift responses in surge and pitch motions are significantly excited by the second-order wave forces.Furthermore,the effect of foundation motion on aerodynamic loads is examined.The normal and tangential forces of the blades demonstrate a slight increase due to the coupling effect between the buoy motion and the aerodynamic loads. 展开更多
关键词 offshore wind power semi-submersible floating foundation vertical axis wind turbine numerical calculation model test
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Jointly improving energy efficiency and smoothing power oscillations of integrated offshore wind and photovoltaic power: a deep reinforcement learning approach 被引量:1
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作者 Xiuxing Yin Meizhen Lei 《Protection and Control of Modern Power Systems》 SCIE EI 2023年第2期156-166,共11页
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 osci... 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. 展开更多
关键词 offshore wind turbine offshore photovoltaic power Deep reinforcement learning Deep deterministic policy gradient Multi-objective optimal control
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Power recovery method for testing the efficiency of the ECD of an integrated generation unit for offshore wind power and ocean wave energy 被引量:2
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作者 CHEN WeiXing GAO Feng +2 位作者 MENG XiangDun REN An Ye HU Yan 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第3期333-344,共12页
Offshore wind power and ocean wave energy are clean,renewable and rich resources.The integrated generation unit for the two
关键词 offshore wind ocean wave energy conversion device(ECD) power recovery method efficiency
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Stability Study on the Bucket Foundation with Multi-Compartment During the Floating-up Process Considering Air Compressibility
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作者 YE Fang-di LIAN Ji-jian +4 位作者 GUO Yao-hua WANG Hai-jun XIAO Tian-run XIONG Dong-zhi YU Tong-shun 《China Ocean Engineering》 SCIE EI CSCD 2023年第6期975-988,共14页
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 evident.In contrast to conventio... 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 evident.In 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 compartment.The construction process of the bucket foundation involves the control of air in the compartment,thus making it more difficult to construct.Especially after the prefabrication of the bucket foundation,the stability of the bucket foundation at the floating-up stage is particularly critical.The 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 compressibility.To 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 angle.At 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 process.In addition,measures to enhance the stability of the bucket foundation are proposed through sensitivity analysis of influencing factors. 展开更多
关键词 offshore wind power bucket foundation air-floating structure STABILITY
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