The Experts below are selected from a list of 185034 Experts worldwide ranked by ideXlab platform
Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.
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centralised Power control of wind farm with doubly fed induction generators
Renewable Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:At the moment, the control ability of wind farms is a prime research concern for the grid integration of large wind farms, due to their required active role in the Power system. This paper describes the on-going work of a research project, whose overall objective is to analyse and assess the possibilities for control of different wind farm concepts. The scope of this paper is the control of a wind farm made up exclusively of doubly fed induction generators. The paper addresses the design and implementation issues of such a controller and focuses on the ability of the wind farm control strategy to regulate the wind farm Power production to the Reference Power ordered by the system operators. The presented wind farm control has a hierarchical structure with both a central control level and a local control level. The central wind farm control level controls the Power production of the whole farm by sending out Reference Power signals to each individual wind turbine, while the local wind turbine control level ensures that the Reference Power signal send by the central control level is reached. The performance of the control strategy is assessed and discussed by means of simulations illustrated both at the wind farm level and at each individual wind turbine level.
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Grid support of a wind farm with active stall wind turbines and AC grid connection
Wind Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:One of the main concerns in the grid integration of large wind farms is their ability to behave as active controllable components in the Power system. This article presents the design of a new integrated Power control system for a wind farm made up exclusively of active stall wind turbines with AC grid connection. The designed control system has the task of enabling such a wind farm to provide the best grid support. It is based on two control levels: a supervisory control level, which controls the Power production of the whole farm by sending out Reference signals to each individual wind turbine, and a local control level, which ensures that the Reference Power signals at the wind turbine level are reached. The ability of active stall wind farms with AC grid connection to control the Power production to the Reference Power ordered by the operators is assessed and discussed by means of simulations. Copyright © 2005 John Wiley & Sons, Ltd.
Anca Daniela Hansen - One of the best experts on this subject based on the ideXlab platform.
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centralised Power control of wind farm with doubly fed induction generators
Renewable Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:At the moment, the control ability of wind farms is a prime research concern for the grid integration of large wind farms, due to their required active role in the Power system. This paper describes the on-going work of a research project, whose overall objective is to analyse and assess the possibilities for control of different wind farm concepts. The scope of this paper is the control of a wind farm made up exclusively of doubly fed induction generators. The paper addresses the design and implementation issues of such a controller and focuses on the ability of the wind farm control strategy to regulate the wind farm Power production to the Reference Power ordered by the system operators. The presented wind farm control has a hierarchical structure with both a central control level and a local control level. The central wind farm control level controls the Power production of the whole farm by sending out Reference Power signals to each individual wind turbine, while the local wind turbine control level ensures that the Reference Power signal send by the central control level is reached. The performance of the control strategy is assessed and discussed by means of simulations illustrated both at the wind farm level and at each individual wind turbine level.
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Grid support of a wind farm with active stall wind turbines and AC grid connection
Wind Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:One of the main concerns in the grid integration of large wind farms is their ability to behave as active controllable components in the Power system. This article presents the design of a new integrated Power control system for a wind farm made up exclusively of active stall wind turbines with AC grid connection. The designed control system has the task of enabling such a wind farm to provide the best grid support. It is based on two control levels: a supervisory control level, which controls the Power production of the whole farm by sending out Reference signals to each individual wind turbine, and a local control level, which ensures that the Reference Power signals at the wind turbine level are reached. The ability of active stall wind farms with AC grid connection to control the Power production to the Reference Power ordered by the operators is assessed and discussed by means of simulations. Copyright © 2005 John Wiley & Sons, Ltd.
Nicolas Galanis - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis and optimization of Power cycles using a finite low temperature heat source
International Journal of Energy Research, 2012Co-Authors: Mohammed Khennich, Nicolas GalanisAbstract:SUMMARY The analysis of a subcritical Rankine cycle with superheating, operating between a constant flowrate low-temperature heat source and a fixed temperature sink, according to the principles of classical and finite size thermodynamics, is presented. The results show the existence of two optimum evaporation pressures: one minimizes the total thermal conductance of the two heat exchangers, whereas the other maximizes the net Power output. A comparison of such results for five working fluids leads to the selection of R141b for a system generating 10% of a Reference Power which depends on the specified source and sink characteristics; for the conditions under consideration this Reference Power is 6861 kW. The results for this particular system show that the minimum total thermal conductance of the two heat exchangers is 1581 kW K−1; the corresponding thermal efficiency is 12.6% and the total exergy losses are 13.8% of the source's exergy. Slightly more than 50% of the exergy destruction occurs in the vapor generator. Copyright © 2011 John Wiley & Sons, Ltd.
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Thermodynamic analysis and optimization of Power cycles using a finite low‐temperature heat source
International Journal of Energy Research, 2011Co-Authors: Mohammed Khennich, Nicolas GalanisAbstract:SUMMARY The analysis of a subcritical Rankine cycle with superheating, operating between a constant flowrate low-temperature heat source and a fixed temperature sink, according to the principles of classical and finite size thermodynamics, is presented. The results show the existence of two optimum evaporation pressures: one minimizes the total thermal conductance of the two heat exchangers, whereas the other maximizes the net Power output. A comparison of such results for five working fluids leads to the selection of R141b for a system generating 10% of a Reference Power which depends on the specified source and sink characteristics; for the conditions under consideration this Reference Power is 6861 kW. The results for this particular system show that the minimum total thermal conductance of the two heat exchangers is 1581 kW K−1; the corresponding thermal efficiency is 12.6% and the total exergy losses are 13.8% of the source's exergy. Slightly more than 50% of the exergy destruction occurs in the vapor generator. Copyright © 2011 John Wiley & Sons, Ltd.
Poul Ejnar Sorensen - One of the best experts on this subject based on the ideXlab platform.
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centralised Power control of wind farm with doubly fed induction generators
Renewable Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:At the moment, the control ability of wind farms is a prime research concern for the grid integration of large wind farms, due to their required active role in the Power system. This paper describes the on-going work of a research project, whose overall objective is to analyse and assess the possibilities for control of different wind farm concepts. The scope of this paper is the control of a wind farm made up exclusively of doubly fed induction generators. The paper addresses the design and implementation issues of such a controller and focuses on the ability of the wind farm control strategy to regulate the wind farm Power production to the Reference Power ordered by the system operators. The presented wind farm control has a hierarchical structure with both a central control level and a local control level. The central wind farm control level controls the Power production of the whole farm by sending out Reference Power signals to each individual wind turbine, while the local wind turbine control level ensures that the Reference Power signal send by the central control level is reached. The performance of the control strategy is assessed and discussed by means of simulations illustrated both at the wind farm level and at each individual wind turbine level.
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Grid support of a wind farm with active stall wind turbines and AC grid connection
Wind Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:One of the main concerns in the grid integration of large wind farms is their ability to behave as active controllable components in the Power system. This article presents the design of a new integrated Power control system for a wind farm made up exclusively of active stall wind turbines with AC grid connection. The designed control system has the task of enabling such a wind farm to provide the best grid support. It is based on two control levels: a supervisory control level, which controls the Power production of the whole farm by sending out Reference signals to each individual wind turbine, and a local control level, which ensures that the Reference Power signals at the wind turbine level are reached. The ability of active stall wind farms with AC grid connection to control the Power production to the Reference Power ordered by the operators is assessed and discussed by means of simulations. Copyright © 2005 John Wiley & Sons, Ltd.
Florin Iov - One of the best experts on this subject based on the ideXlab platform.
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centralised Power control of wind farm with doubly fed induction generators
Renewable Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:At the moment, the control ability of wind farms is a prime research concern for the grid integration of large wind farms, due to their required active role in the Power system. This paper describes the on-going work of a research project, whose overall objective is to analyse and assess the possibilities for control of different wind farm concepts. The scope of this paper is the control of a wind farm made up exclusively of doubly fed induction generators. The paper addresses the design and implementation issues of such a controller and focuses on the ability of the wind farm control strategy to regulate the wind farm Power production to the Reference Power ordered by the system operators. The presented wind farm control has a hierarchical structure with both a central control level and a local control level. The central wind farm control level controls the Power production of the whole farm by sending out Reference Power signals to each individual wind turbine, while the local wind turbine control level ensures that the Reference Power signal send by the central control level is reached. The performance of the control strategy is assessed and discussed by means of simulations illustrated both at the wind farm level and at each individual wind turbine level.
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Grid support of a wind farm with active stall wind turbines and AC grid connection
Wind Energy, 2006Co-Authors: Anca Daniela Hansen, Poul Ejnar Sorensen, Florin Iov, Frede BlaabjergAbstract:One of the main concerns in the grid integration of large wind farms is their ability to behave as active controllable components in the Power system. This article presents the design of a new integrated Power control system for a wind farm made up exclusively of active stall wind turbines with AC grid connection. The designed control system has the task of enabling such a wind farm to provide the best grid support. It is based on two control levels: a supervisory control level, which controls the Power production of the whole farm by sending out Reference signals to each individual wind turbine, and a local control level, which ensures that the Reference Power signals at the wind turbine level are reached. The ability of active stall wind farms with AC grid connection to control the Power production to the Reference Power ordered by the operators is assessed and discussed by means of simulations. Copyright © 2005 John Wiley & Sons, Ltd.
