The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
B. F. Dmitriev - One of the best experts on this subject based on the ideXlab platform.
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The marine electrical Power industry with the use of renewable energy carriers. Part 2. Axial multipole synchronous generators with permanent magnets for wind and wave Offshore Power Plants
Russian Electrical Engineering, 2016Co-Authors: V. I. Khrisanov, B. F. DmitrievAbstract:The paper deals with problems of selection of structures and optimum design of multipole permanent magnet synchronous machines (PMSMs) for operation in Offshore wind- and wave-Power Plants under severe conditions for maintenance service. It is shown that multipole PMSMs are a new and very suitable electrical machine for direct connected turbogenerators in Power Plants and, at the same time, multipole PMSMs meet a number of other important demands, including high reliability, contactless construction, high efficiency, minimum mass and dimensions, and cost effectiveness. With the aim of systematization, an integrated classification scheme of PMSMs is presented to describe the variety of designs of stator and rotor configurations. With the help of a theoretical analysis based on a geometrical approach, analytical expressions for PMSM comparison are derived using the relationship between the criterion of optimization (maximum Power density) and the main geometric parameters of PMSMs. Comparative analysis of the PMSMs with radial and axial magnetic fluxes for the case of various numbers of poles and different diameters of rotors has confirmed that axial multipole PMSMs are synchronous machines with maximum Power density and an optimum variant for direct connected turbogenerator structures for Offshore wind- and wave-Power Plants. It is noted that the advantage of axial PMSMs over radial PMSMs is monotonic growth in accordance with increasing number of poles p . Under the condition that p ≥ 20, which is strictly necessary for designing direct connected turbogenerators in Offshore wind- and wave-Power Plants, we have more than doubled the Power density at axial PMSMs as compared with radial ones.
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marine electrical Power industry with renewable energy carriers part 1 wind and wave turbines of Offshore Power Plants
Russian Electrical Engineering, 2016Co-Authors: V. I. Khrisanov, B. F. DmitrievAbstract:The paper is devoted to Offshore wind and wave Power Plants as an alternative to fossil hydrocarbon Power engineering. It reports classifications and an analytical survey of the state-of-the-art of main types of Offshore wind and wave turbines. The features of horizontal and vertical axes turbines constructions are described. Comparison of these two types of turbines has revealed the vertical axes design advantage since their height is two to three times less and its stability, accordingly, is higher. This allows expensive concrete tower constructions to be avoided and floating pontoons to be used, which is especially important for deep-water areas. The advantages of a two-contour wind turbine consisting of a fixed stator and a rotor directly connected with an electrical generator are highlighted. Due to the special “soaring in air” block construction of the turbine, the pressure on the seabed foundation is considerably reduced, allowing all the supporting structure for a floating pontoon to be replaced. The designs of wave turbines with direct and indirect operation are considered as well, the principles of harnessing marine wave energy are discussed and industrial prototypes of Power Plants of foreign firms are presented. With the help of analytical expressions, the evaluation of Power performances is executed and a comparison of the Power density criterion of wave energy with other kinds of renewable energy is indicated. It appears that the energy density of sea waves is an order greater of similar magnitude of wind and solar energy. On the basis of the idea of floating structures, the principles of designing hybrid and cluster Offshore wind and wave Power stations are suggested, where, with the help of Power electronics and information technology, the electric energy of separate turbogenerators is integrated into a marine Power pool system with HVDC underwater cable transmission to the consumers of a continental zone.
Antoni Sudrià-andreu - One of the best experts on this subject based on the ideXlab platform.
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Sensorless control of a Power converter for a cluster of small wind turbines
IET Renewable Power Generation, 2016Co-Authors: Agustí Egea-Àlvarez, Mónica Aragüés-peñalba, Oriol Gomis-bellmunt, Joan Rull-duran, Antoni Sudrià-andreuAbstract:This study presents a new sensorless control for small wind turbine clusters with a single Power converter with a direct torque control algorithm. The proposed system consists of a wind farm connected to a back-to-back Power converter that interfaces the wind farm with the AC grid. The studied wind turbines are based on fixed-speed wind turbines equipped with squirrel cage induction generators with individual pitch control. The presented structure permits to reduce the number of converters and allows to accomplish the grid codes (fault ride through capability and reactive Power support). Furthermore, the generated active Power can be reduced according to grid operator requirements. The presented control scheme can be applied to wind turbine rePowering projects, wind farms connected to a microgrid, even, new small onshore and Offshore Power Plants. The system performance and stability is studied and validated by means of dynamic simulations.
Keith Worden - One of the best experts on this subject based on the ideXlab platform.
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Wind Turbine Health Monitoring: Current and Future Trends with an Active Learning Twist
Rotating Machinery Hybrid Test Methods Vibro-Acoustics & Laser Vibrometry Volume 8, 2017Co-Authors: Nikolaos Dervilis, A. E. Maguire, Evangelos Papatheou, Keith WordenAbstract:The use of Offshore wind farms has been geometrically growing in recent years. Offshore Power Plants move into deeper waters as European water sites offer impressive wind conditions. However, the cost of an Offshore wind farm is relatively high, and therefore, their reliability is crucial if they ever need to be fully integrated into the energy arena. This paper presents an investigation of current monitoring trends for wind turbines (WTs) and will try to address the motivation and the effectiveness of Structural Health Monitoring (SHM) machine learning applications for the different components of a WTs, as well as, the novel idea of intelligent WT in terms of data knowledge transfer and learning.
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A Performance Monitoring Approach for the Novel Lillgrund Offshore Wind Farm
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Evangelos Papatheou, Nikolaos Dervilis, A. E. Maguire, Ifigeneia Antoniadou, Keith WordenAbstract:The use of Offshore wind farms has been growing in recent years. Europe is presenting a geometrically growing interest in exploring and investing in such Offshore Power Plants as the continent's water sites offer impressive wind conditions. Moreover, as human activities tend to complicate the construction of land wind farms, Offshore locations, which can be found more easily near densely populated areas, can be seen as an attractive choice. However, the cost of an Offshore wind farm is relatively high, and therefore, their reliability is crucial if they ever need to be fully integrated into the energy arena. This paper presents an analysis of supervisory control and data acquisition (SCADA) extracts from the Lillgrund Offshore wind farm for the purposes of monitoring. An advanced and robust machine-learning approach is applied, in order to produce individual and population-based Power curves and then predict measurements of the Power produced from each wind turbine (WT) from the measurements of the other WTs in the farm. Control charts with robust thresholds calculated from extreme value statistics are successfully applied for the monitoring of the turbines.
V. I. Khrisanov - One of the best experts on this subject based on the ideXlab platform.
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The marine electrical Power industry with the use of renewable energy carriers. Part 2. Axial multipole synchronous generators with permanent magnets for wind and wave Offshore Power Plants
Russian Electrical Engineering, 2016Co-Authors: V. I. Khrisanov, B. F. DmitrievAbstract:The paper deals with problems of selection of structures and optimum design of multipole permanent magnet synchronous machines (PMSMs) for operation in Offshore wind- and wave-Power Plants under severe conditions for maintenance service. It is shown that multipole PMSMs are a new and very suitable electrical machine for direct connected turbogenerators in Power Plants and, at the same time, multipole PMSMs meet a number of other important demands, including high reliability, contactless construction, high efficiency, minimum mass and dimensions, and cost effectiveness. With the aim of systematization, an integrated classification scheme of PMSMs is presented to describe the variety of designs of stator and rotor configurations. With the help of a theoretical analysis based on a geometrical approach, analytical expressions for PMSM comparison are derived using the relationship between the criterion of optimization (maximum Power density) and the main geometric parameters of PMSMs. Comparative analysis of the PMSMs with radial and axial magnetic fluxes for the case of various numbers of poles and different diameters of rotors has confirmed that axial multipole PMSMs are synchronous machines with maximum Power density and an optimum variant for direct connected turbogenerator structures for Offshore wind- and wave-Power Plants. It is noted that the advantage of axial PMSMs over radial PMSMs is monotonic growth in accordance with increasing number of poles p . Under the condition that p ≥ 20, which is strictly necessary for designing direct connected turbogenerators in Offshore wind- and wave-Power Plants, we have more than doubled the Power density at axial PMSMs as compared with radial ones.
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marine electrical Power industry with renewable energy carriers part 1 wind and wave turbines of Offshore Power Plants
Russian Electrical Engineering, 2016Co-Authors: V. I. Khrisanov, B. F. DmitrievAbstract:The paper is devoted to Offshore wind and wave Power Plants as an alternative to fossil hydrocarbon Power engineering. It reports classifications and an analytical survey of the state-of-the-art of main types of Offshore wind and wave turbines. The features of horizontal and vertical axes turbines constructions are described. Comparison of these two types of turbines has revealed the vertical axes design advantage since their height is two to three times less and its stability, accordingly, is higher. This allows expensive concrete tower constructions to be avoided and floating pontoons to be used, which is especially important for deep-water areas. The advantages of a two-contour wind turbine consisting of a fixed stator and a rotor directly connected with an electrical generator are highlighted. Due to the special “soaring in air” block construction of the turbine, the pressure on the seabed foundation is considerably reduced, allowing all the supporting structure for a floating pontoon to be replaced. The designs of wave turbines with direct and indirect operation are considered as well, the principles of harnessing marine wave energy are discussed and industrial prototypes of Power Plants of foreign firms are presented. With the help of analytical expressions, the evaluation of Power performances is executed and a comparison of the Power density criterion of wave energy with other kinds of renewable energy is indicated. It appears that the energy density of sea waves is an order greater of similar magnitude of wind and solar energy. On the basis of the idea of floating structures, the principles of designing hybrid and cluster Offshore wind and wave Power stations are suggested, where, with the help of Power electronics and information technology, the electric energy of separate turbogenerators is integrated into a marine Power pool system with HVDC underwater cable transmission to the consumers of a continental zone.
Agustí Egea-Àlvarez - One of the best experts on this subject based on the ideXlab platform.
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Sensorless control of a Power converter for a cluster of small wind turbines
IET Renewable Power Generation, 2016Co-Authors: Agustí Egea-Àlvarez, Mónica Aragüés-peñalba, Oriol Gomis-bellmunt, Joan Rull-duran, Antoni Sudrià-andreuAbstract:This study presents a new sensorless control for small wind turbine clusters with a single Power converter with a direct torque control algorithm. The proposed system consists of a wind farm connected to a back-to-back Power converter that interfaces the wind farm with the AC grid. The studied wind turbines are based on fixed-speed wind turbines equipped with squirrel cage induction generators with individual pitch control. The presented structure permits to reduce the number of converters and allows to accomplish the grid codes (fault ride through capability and reactive Power support). Furthermore, the generated active Power can be reduced according to grid operator requirements. The presented control scheme can be applied to wind turbine rePowering projects, wind farms connected to a microgrid, even, new small onshore and Offshore Power Plants. The system performance and stability is studied and validated by means of dynamic simulations.
