The Experts below are selected from a list of 32430 Experts worldwide ranked by ideXlab platform
Sander M Calisal - One of the best experts on this subject based on the ideXlab platform.
-
An integrated model for estimating energy cost of a Tidal Current turbine farm
Energy Conversion and Management, 2011Co-Authors: Barbara J. Lence, Sander M CalisalAbstract:Abstract A Tidal Current turbine is a device for harnessing energy from Tidal Currents and functions in a manner similar to a wind turbine. A Tidal Current turbine farm consists of a group of Tidal Current turbines distributed in a site where high-speed Current is available. The accurate prediction of energy cost of a Tidal Current turbine farm is important to the justification of planning and constructing such a farm. However, the existing approaches used to predict energy cost of Tidal Current turbine farms oversimplify the hydrodynamic interactions between turbines in energy prediction and oversimplify the operation and maintenance strategies involved in cost estimation as well as related fees. In this paper, we develop a model, which integrates a marine hydrodynamic model with high accuracy for predicting energy output and a comprehensive cost-effective operation and maintenance model for estimating the cost that may be incurred in producing the energy, to predict energy cost from a Tidal Current turbine farm. This model is expected to be able to simulate more complicated cases and generate more accurate results than existing models. As there is no real Tidal Current turbine farm, we validate this model with offshore wind studies. Finally, case studies about Vancouver are conducted with a scenario-based analysis. We minimize the energy cost by minimizing the total cost and maximizing the total power output under constraints related to the local conditions (e.g., geological and labor information) and the turbine specifications. The results suggest that Tidal Current energy is about ready to penetrate the electricity market in some major cities in North America if learning curve for the operational and maintenance is minimum.
-
numerical analysis of the characteristics of vertical axis Tidal Current turbines
Renewable Energy, 2010Co-Authors: Sander M CalisalAbstract:Tidal Current is considered to be one of the promising alternative green energy resources. Tidal Current turbines are devices used for harnessing Tidal Current energy. The development of a standard for Tidal Current turbine design is a very important step in the commercialization of Tidal Current energy as the Tidal Current industry is growing rapidly, but no standard for Tidal Current turbines has been developed yet. In this paper, we present our recent efforts in the numerical simulation of the characteristics (e.g., power output, torque fluctuation, induced velocity, and acoustic emission) of Tidal Current turbines related to the development of the standard. The relationship between the characteristics and the parameters of an example turbine are extensively discussed and quantified. The findings of this paper are expected to be helpful in developing the standards for Tidal Current turbines in the near future.
M.c. Sander - One of the best experts on this subject based on the ideXlab platform.
-
SMC - Modeling Tidal turbine farm with vertical axis Tidal Current turbines
2007 IEEE International Conference on Systems Man and Cybernetics, 2007Co-Authors: Ye Li, J.l. Barbara, M.c. SanderAbstract:A Tidal Current turbine is a device for harnessing energy from marine Currents, and functions in a manner similar to a wind turbine. A group of Tidal Current turbines distributed in a site in ocean is called a Tidal turbine farm. Among all Tidal Current energy extraction schemes, turbine farm is regarded as among the most promising turbine configurations; in fact, of turbine farms are extensively employed in the wind power industry. Wind farm planning and modeling approaches cannot be fully transferred to Tidal farms, however, because of the complexities involved in modeling the underwater Tidal turbine. This study develops a framework for planning a Tidal turbine farm system with vertical axis Tidal Current turbines. This framework is intended to be used by energy planners in the early design stage. An approach for selecting the optimal design among alternative Tidal turbine farm designs is proposed whereby the attractiveness of the alternatives is evaluated based on cost effectiveness. Where possible, experience gained from analysis of existing offshore wind farms is applied. The state of the art of Tidal turbine design and wind farm planning are reviewed, and a planning framework for selecting the optimal Tidal farm design is provided by identifying the important mathematical modeling procedures and elements. Considering the particular design of the vertical axis Tidal turbine, a simplified relationship of turbine distribution and turbine farm efficiency is developed. As a case study, numerical simulation results are presented for environmental conditions offshore of British Columbia, Canada.
Shujie Wang - One of the best experts on this subject based on the ideXlab platform.
-
DEVELOPMENT OF A GRAVITY-BASED Tidal Current POWER PLANT
Power and Energy 807: Intelligent Systems and Control 808: Technology for Education and Learning, 2013Co-Authors: Shujie Wang, Yuan Peng, Junzhe TanAbstract:Adapting to the actual conditions of the Tidal Current energy resources in Northern China, which has the features of relatively low velocity and shallow water, a kind of gravity-based Tidal Current energy converters was developed. Two full-scale 50kW horizontal axis Tidal Current turbines were produced. Tower typed gravitybased supporting structure of the turbine was adopted in order to fit for the real situations of the sea area where the power plant would build. To ensure the stability of the supporting structure, numerical simulation was carried out by using the wave theory and CFD method. Then combined effect of wave load and Current load on the device was discussed. Moreover, offshore construction plan of the device including towing, deployment, recovery and maintenance was presented, reliability and the ability of anti sliding or overturning during the operation period was assessed to ensure safety of deployment and running. A Tidal Current power plant has been constructed based on technology presented in this paper.
-
an overview of development of Tidal Current in china energy resource conversion technology and opportunities
Renewable & Sustainable Energy Reviews, 2010Co-Authors: Shujie Wang, Peng YuanAbstract:The world has been suffering dramatically increasing energy consumption during recent years. As the biggest developing country, China has a more urgent situation. To highlight the promising potential of renewable energy may be the only solution. Due to the vast sea area and continuous coast line of 18,000 km, China has an excellent Tidal Current energy resource, which has good prospect for development. In this paper, the development of Tidal Current in China is briefly reviewed. The description is focused on the Tidal Current energy resource and the status of conversion technologies in China. Finally, the opportunities of the development of Tidal Current in China, including the urgent energy situation, the increasing pressure on reducing emissions, national policies for Tidal Current energy development and the increase of investment, are discussed in detail. A conclusion is made that the Tidal Current energy ought to be an important option for China in terms of renewable energy.
Hongwei Liu - One of the best experts on this subject based on the ideXlab platform.
-
blade pitch system for Tidal Current turbines with reduced variation pitch control strategy based on Tidal Current velocity preview
Renewable Energy, 2018Co-Authors: Yong-gang Lin, Hongwei LiuAbstract:Abstract A collective pitch control system is designed using a rack and pinion gear set and hydraulic drive to provide an available blade pitch angle from 0° to 180°. This response accounts for the Tidal Current bi-directionality caused by flood and ebb under the moon's gravitational force. A front-installed hydraulic cylinder drives the rack-and-pinion system to synchronously turn the blades. Mechanisms are designed to overcome the difficulties of an outer hydraulic oil being deposited into the rotary hub and the pitch angle detection in a rotary hub. This simple and compact structure in a narrow hub reduces Current blocking. Experimental results demonstrate that the pitch system has excellent dynamic characteristics. A Tidal Current velocity preview (CVP) method is proposed to overcome the difficulty of Current velocity detection at the rotary impeller. Sealing is important for these underwater conditions. Hence, a reduced variation pitch control strategy is proposed based on CVP to reduce pitch action, which decreases mechanical wear of the sealing structure while extending the Tidal Current turbine's working life. Comparative results are obtained by using both an approximate sinusoidal Current velocity data set simulating periods of real flow and a sea trial measured data set containing highly-turbulent and velocity-sheared flow in a semi-physical test. This test validated the significant reduction of pitch action and relatively high efficiency for energy generation.
-
Review on the blade design technologies of Tidal Current turbine
Renewable and Sustainable Energy Reviews, 2016Co-Authors: Zhou Hongbin, Hongwei Liu, Yong-gang LinAbstract:Abstract Tidal Current turbine (TCT) is a kind of device which converts the Tidal Current energy into electricity and its technology has got rapid progress in last decade. The design of TCT includes the blade, power train, electrical system and power converter, sealing system and foundation, etc. In spite of the principle similarity to the wind energy, the design of the blade should be specially carried on for its characteristics of cavitation, corrosion resistance and the big force on the blades. In this paper, the technology developments of the TCT blade design are reviewed, including the hydrodynamics design and the structure design. Subsequently the key technologies to be researched for the TCT blade design are concluded and forecasted.
-
A review on the development of Tidal Current energy in China
Renewable and Sustainable Energy Reviews, 2011Co-Authors: Hongwei Liu, Gu Haigang, Yong-gang Lin, Xiao-jing SunAbstract:Nowadays and in the coming years, increased attention is being given to the Tidal Current energy development all over the world. China is a country endowed with abundant Tidal Current energy resources. In this paper, the distribution of Tidal Current energy in China was presented. Policies and Current status of usage and technology development of Tidal Current power generation in China were introduced. Meanwhile, special focus was given to the research programs being carried out and the achievements made. Finally, existing challenges were addressed and the future perspectives of Tidal Current energy development in China were provided.
Ye Li - One of the best experts on this subject based on the ideXlab platform.
-
SMC - Modeling Tidal turbine farm with vertical axis Tidal Current turbines
2007 IEEE International Conference on Systems Man and Cybernetics, 2007Co-Authors: Ye Li, J.l. Barbara, M.c. SanderAbstract:A Tidal Current turbine is a device for harnessing energy from marine Currents, and functions in a manner similar to a wind turbine. A group of Tidal Current turbines distributed in a site in ocean is called a Tidal turbine farm. Among all Tidal Current energy extraction schemes, turbine farm is regarded as among the most promising turbine configurations; in fact, of turbine farms are extensively employed in the wind power industry. Wind farm planning and modeling approaches cannot be fully transferred to Tidal farms, however, because of the complexities involved in modeling the underwater Tidal turbine. This study develops a framework for planning a Tidal turbine farm system with vertical axis Tidal Current turbines. This framework is intended to be used by energy planners in the early design stage. An approach for selecting the optimal design among alternative Tidal turbine farm designs is proposed whereby the attractiveness of the alternatives is evaluated based on cost effectiveness. Where possible, experience gained from analysis of existing offshore wind farms is applied. The state of the art of Tidal turbine design and wind farm planning are reviewed, and a planning framework for selecting the optimal Tidal farm design is provided by identifying the important mathematical modeling procedures and elements. Considering the particular design of the vertical axis Tidal turbine, a simplified relationship of turbine distribution and turbine farm efficiency is developed. As a case study, numerical simulation results are presented for environmental conditions offshore of British Columbia, Canada.
