The Experts below are selected from a list of 9294 Experts worldwide ranked by ideXlab platform
Nick Jenkins - One of the best experts on this subject based on the ideXlab platform.
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a multi terminal hvdc transmission system for Offshore Wind Farms with induction generators
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: J U N Liang, Janaka Ekanayake, Oriol Gomisbellmunt, Nick JenkinsAbstract:Voltage source converter, multi-terminal HVDC transmission (MTDC) for the connection of large Offshore Wind Farms to the terrestrial grid is investigated. Induction generators without the need of Wind turbine converters are installed in the Wind Farms due to the supports from the voltage source converters of the HVDC. A control system is designed which incorporates the voltage–current characteristics of the voltage source converters and the power reduction from the Wind turbines during a fault. During normal operation, grid side converters control the DC voltage and coordinate the power sharing to the terrestrial grids. During abnormal operation, Wind farm side converters take over the DC voltage control and coordinate the power reduction between Wind Farms. The control system removes the requirement for fast communication between the converters and achieves automatic coordination. The dynamic performance of a MTDC with the control system is tested through simulations using PSCAD/EMTDC.
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operation and control of multiterminal hvdc transmission for Offshore Wind Farms
IEEE Transactions on Power Delivery, 2011Co-Authors: J U N Liang, Janaka Ekanayake, Tianjun Jing, Oriol Gomisbellmunt, Nick JenkinsAbstract:Three configurations of voltage source converter multi-terminal HVDC transmission for large Offshore Wind Farms are studied. The voltage-current characteristics of the converters are shown and the operation of the converters with different power output from the Wind Farms is discussed. The control system is designed to achieve automatic coordination between the converters without the need of fast communication between them. The operation of the multi-terminal HVDC transmission with the control system is tested through simulations using PSCAD/EMTDC and through experiments on a three-terminal test rig. The simulation and experimental results show good agreement.
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Topologies of multiterminal HVDC-VSC transmission for large Offshore Wind Farms
Electric Power Systems Research, 2011Co-Authors: Oriol Gomis-bellmunt, J U N Liang, Rosemary King, Janaka Ekanayake, Nick JenkinsAbstract:Topologies of multiterminal HVDC-VSC transmission systems for large Offshore Wind Farms are investigated. System requirements for multiterminal HVDC are described, particularly the maximum power loss allowed in the event of a fault. Alternative control schemes and HVDC circuit topologies are reviewed, including the need for HVDC circuit breakers. Various topologies are analyzed and compared according to a number of criteria: number and capacity of HVDC circuits, number of HVDC circuit breakers, maximum power loss, flexibility, redundancy, lines utilization, need for Offshore switching platforms and fast communications.
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electrical stability of large Offshore Wind Farms
AC-DC Power Transmission 2001. Seventh International Conference on (Conf. Publ. No. 485), 2001Co-Authors: L Holdsworth, Nick Jenkins, G StrbacAbstract:Transient and steady state modelling of large MW capacity, induction generator, Wind turbines used for Offshore Wind Farms is presented. The possibility of network voltage instability is investigated. Results are presented from simulations using predicted turbine and network data for UK Offshore Wind farm installations. Possible techniques to improve dynamic stability, applied to both the electrical and mechanical systems of the Wind turbine, are discussed.
J E Fletcher - One of the best experts on this subject based on the ideXlab platform.
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Protection schemes for meshed VSC-HVDC transmission systems for large-scale Offshore Wind Farms
Large Scale Renewable Power Generation, 2014Co-Authors: Jin Yang, J E FletcherAbstract:This chapter discusses network protection of high-voltage direct current (HVDC) transmission systems for large-scale Offshore Wind Farms where the HVDC system utilizes voltage-source converters. The multi-terminal HVDC network topology and protection allocation and configuration are discussed with DC circuit breaker and protection relay configurations studied for different fault conditions. A detailed protection scheme is designed with a solution that does not require relay communication. Advanced understanding of protection system design and operation is necessary for reliable and safe operation of the meshed HVDC system under fault conditions. Meshed-HVDC systems are important as they will be used to interconnect large-scale Offshore Wind generation projects. Offshore Wind generation is growing rapidly and offers a means of securing energy supply and addressing emissions targets whilst minimising community impacts. There are ambitious plans concerning such projects in Europe and in the Asia-Pacific region which will all require a reliable yet economic system to generate, collect, and transmit electrical power from renewable resources. Collective Offshore Wind Farms are efficient and have potential as a significant low-carbon energy source. However, this requires a reliable collection and transmission system. Offshore Wind power generation is a relatively new area and lacks systematic analysis of faults and associated operational experience to enhance further development. Appropriate fault protection schemes are required and this chapter highlights the process of developing and assessing such schemes. The chapter illustrates the basic meshed topology, identifies the need for distance evaluation, and appropriate cable models, then details the design and operation of the protection scheme with simulation results used to illustrate operation.
J U N Liang - One of the best experts on this subject based on the ideXlab platform.
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a multi terminal hvdc transmission system for Offshore Wind Farms with induction generators
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: J U N Liang, Janaka Ekanayake, Oriol Gomisbellmunt, Nick JenkinsAbstract:Voltage source converter, multi-terminal HVDC transmission (MTDC) for the connection of large Offshore Wind Farms to the terrestrial grid is investigated. Induction generators without the need of Wind turbine converters are installed in the Wind Farms due to the supports from the voltage source converters of the HVDC. A control system is designed which incorporates the voltage–current characteristics of the voltage source converters and the power reduction from the Wind turbines during a fault. During normal operation, grid side converters control the DC voltage and coordinate the power sharing to the terrestrial grids. During abnormal operation, Wind farm side converters take over the DC voltage control and coordinate the power reduction between Wind Farms. The control system removes the requirement for fast communication between the converters and achieves automatic coordination. The dynamic performance of a MTDC with the control system is tested through simulations using PSCAD/EMTDC.
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operation and control of multiterminal hvdc transmission for Offshore Wind Farms
IEEE Transactions on Power Delivery, 2011Co-Authors: J U N Liang, Janaka Ekanayake, Tianjun Jing, Oriol Gomisbellmunt, Nick JenkinsAbstract:Three configurations of voltage source converter multi-terminal HVDC transmission for large Offshore Wind Farms are studied. The voltage-current characteristics of the converters are shown and the operation of the converters with different power output from the Wind Farms is discussed. The control system is designed to achieve automatic coordination between the converters without the need of fast communication between them. The operation of the multi-terminal HVDC transmission with the control system is tested through simulations using PSCAD/EMTDC and through experiments on a three-terminal test rig. The simulation and experimental results show good agreement.
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Topologies of multiterminal HVDC-VSC transmission for large Offshore Wind Farms
Electric Power Systems Research, 2011Co-Authors: Oriol Gomis-bellmunt, J U N Liang, Rosemary King, Janaka Ekanayake, Nick JenkinsAbstract:Topologies of multiterminal HVDC-VSC transmission systems for large Offshore Wind Farms are investigated. System requirements for multiterminal HVDC are described, particularly the maximum power loss allowed in the event of a fault. Alternative control schemes and HVDC circuit topologies are reviewed, including the need for HVDC circuit breakers. Various topologies are analyzed and compared according to a number of criteria: number and capacity of HVDC circuits, number of HVDC circuit breakers, maximum power loss, flexibility, redundancy, lines utilization, need for Offshore switching platforms and fast communications.
Clara Matutano - One of the best experts on this subject based on the ideXlab platform.
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Design of Scour Protection Systems in Offshore Wind Farms
Journal of Energy Resources Technology-transactions of The Asme, 2015Co-Authors: Clara Matutano, Vicente Negro, José-santos López-gutiérrez, M. Dolores EstebanAbstract:Scour compromises the operation of Offshore facilities. This article describes the results of an investigation aimed at the analysis of different methods used in the scour protection systems design at Offshore Wind Farms. The study is focused on transitional waters, where monopile foundations present medium or large diameters. Using the experience of Offshore Wind Farms currently installed, a new design formula is proposed. All of this with the aim of improving a preliminary design of scour protection systems considering maritime parameters.
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The effect of scour protections in Offshore Wind Farms
Journal of Coastal Research, 2014Co-Authors: Clara Matutano, Vicente Negro, José-santos López-gutiérrez, M. Dolores Esteban, Andrés HernándezAbstract:ABSTRACT Matutano, C., Negro, V., Lopez-Gutierrez, J. S., Esteban, M.D., Hernandez, A,. 2014. The effect of scour protections in Offshore Wind Farms. In: Green, A.N. and Cooper, J.A.G. (eds.), Proceedings 13th International Coastal Symposium (Durban, South Africa), Journal of Coastal Research, Special Issue No. 70, pp. 012–017 ISSN 0749-0208. The installation of Offshore scour protection systems in Offshore Wind Farms allows avoid the effect of scour phenomenon around these structures. Up to date, numerous research projects have been carried out to justify the necessity of the scour protection systems and also to optimize their design. Protection systems based on riprap is frequently used due to its low cost and easy availability compared to other solutions such as geotextile bags or prefabricated concrete blocks. The sizing of these structures can be performed according to a series of recommendations that can optimize the costs associated with them, but there have been only few studies with real data up ...
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scour prediction and scour protections in Offshore Wind Farms
Renewable Energy, 2013Co-Authors: Clara Matutano, Vicente Negro, Josesantos Lopezgutierrez, Dolores M EstebanAbstract:This paper is the result of research whose main objective is to analyse different methods used for the prediction of maximum scour depth and scour extension, and for the design of scour protections in Offshore Wind Farms located in shallow water, using medium and large diameter monopile foundations. Physical agents such as waves, currents and Wind play a major role in the design of structures like Offshore Farms. As a result, the study has highlighted the need for introducing experience backed climate monomials such as the dimensionless wave height parameter (H0) and proposes the use of formulations that can express the extent of scour protections as a function of waves in transitional waters.
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Dimensionless wave height parameter for preliminary design of scour protection in Offshore Wind Farms
Journal of Coastal Research, 2013Co-Authors: Clara Matutano, Vicente Negro, José-santos López-gutiérrez, M. Dolores Esteban, J. María Del CampoAbstract:ABSTRACT Matutano, C., Negro, V., Lopez-Gutierrez, J.S., Esteban, M.D. and del Campo, J.M, 2013. Dimensionless wave height parameter for preliminary design of scour protection in Offshore Wind Farms The scour phenomenon jeopardizes the operating capacity of Offshore structures since it compromises their stability. The study of this phenomenon in the field of Offshore Wind Farms began few years ago. Considering that these structures are subjected to waves, currents and tides. This article describes the results of an investigation aimed at the analysis methods used in the design of the protections against scour phenomenon on Offshore Wind Farms in transitional waters, using medium and large diameter monopile type deep foundations. In order to do this, a thorough review of those premises was performed, from one of the first experiences in 1991 (Denmark), to the recently implemented and proposed in the UK, defining its main characteristics (acting maritime climate, the correlation between wave height and peri...
Jin Yang - One of the best experts on this subject based on the ideXlab platform.
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Protection schemes for meshed VSC-HVDC transmission systems for large-scale Offshore Wind Farms
Large Scale Renewable Power Generation, 2014Co-Authors: Jin Yang, J E FletcherAbstract:This chapter discusses network protection of high-voltage direct current (HVDC) transmission systems for large-scale Offshore Wind Farms where the HVDC system utilizes voltage-source converters. The multi-terminal HVDC network topology and protection allocation and configuration are discussed with DC circuit breaker and protection relay configurations studied for different fault conditions. A detailed protection scheme is designed with a solution that does not require relay communication. Advanced understanding of protection system design and operation is necessary for reliable and safe operation of the meshed HVDC system under fault conditions. Meshed-HVDC systems are important as they will be used to interconnect large-scale Offshore Wind generation projects. Offshore Wind generation is growing rapidly and offers a means of securing energy supply and addressing emissions targets whilst minimising community impacts. There are ambitious plans concerning such projects in Europe and in the Asia-Pacific region which will all require a reliable yet economic system to generate, collect, and transmit electrical power from renewable resources. Collective Offshore Wind Farms are efficient and have potential as a significant low-carbon energy source. However, this requires a reliable collection and transmission system. Offshore Wind power generation is a relatively new area and lacks systematic analysis of faults and associated operational experience to enhance further development. Appropriate fault protection schemes are required and this chapter highlights the process of developing and assessing such schemes. The chapter illustrates the basic meshed topology, identifies the need for distance evaluation, and appropriate cable models, then details the design and operation of the protection scheme with simulation results used to illustrate operation.
