| 1. |
- Goncalves de Oliveira, Janaina, et al.
(författare)
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Implementation and Control of an AC/DC/AC Converter for Double Wound Flywheel Application
- 2012
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Ingår i: Advances in Power Electronics. - : Hindawi Publishing Corporation. - 2090-1828 .- 2090-181X. ; 2012, s. 604703-
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Tidskriftsartikel (refereegranskat)abstract
- An all-electric driveline based on a double wound flywheel, connected in series between main energy storage and a wheel motor, is presented. The flywheel works as a power buffer, allowing the battery to deliver optimized power. It also separates electrically the system in two sides, with the battery connected to the low voltage side and the wheel motor connected to the high voltage side. This paper presents the implementation and control of the AC/DC/AC converter, used to connect the flywheel high voltage windings to the wheel motor. The converter general operation and the adopted control strategy are discussed. The implementation of the AC/DC/AC converter has been described from a practical perspective. Results from experimental tests performed in the full-system prototype are presented. The prototype system is running with satisfactory stability during acceleration mode. Good efficiency and unity power factor could be achieved, based on vector control and space vector modulation.
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| 2. |
- Goncalves de Oliveira, Janaina, et al.
(författare)
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Study on a doubly-fed flywheel machine-based driveline with an AC/DC/AC converter
- 2012
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Ingår i: Electrical Systems in Transportation, IET. - : Institution of Engineering and Technology (IET). - 2042-9738 .- 2042-9746. ; 2:2, s. 51-57
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Tidskriftsartikel (refereegranskat)abstract
- The combination of a flywheel device with a battery source has several advantages, such as high-peak power capacity, high energy density and reduction in the number of charging/discharging cycles in the battery. The flywheel system investigated here uses a double-wound flywheel motor/generator to divide the system into two different voltage/power levels. An AC/DC/AC converter is used to connect the high-power windings of the flywheel machine to the traction motor. The control strategy of the AC/DC/AC converter is discussed. The simulations of the complete system are carried out using Simulink and are compared with the experimental results, obtained from a scaled experimental test set-up. Simulations and experimental results show good agreement, where the designed controllers have managed to keep the different controlled signals almost equal to their reference values. Unity power factor and low distortion has been obtained in the flywheel voltage and current. The average efficiency of the driveline during a simple drive cycle has been obtained, being approximately 87%. A theoretical calculation, based on the real parameters of the system, was made, and it showed good agreement with the simulation and experimental results.
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| 3. |
- Osticioli, I., et al.
(författare)
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Red lakes from Leonardo's Last Supper and other Old Master Paintings: Micro-Raman spectroscopy of anthraquinone pigments in paint cross-sections
- 2019
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Ingår i: Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy. - : Elsevier BV. - 1386-1425. ; 222
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Tidskriftsartikel (refereegranskat)abstract
- The analysis of red particles in paint cross-sections from Leonardo da Vinci's Last Supper, Masolino da Panicale's wall painting Beheading of St. John the Baptist in Castiglione Olona, Tintoretto's The Discovery of the Body of Saint Mark and Paolo Veronese's Supper in the House of Simon has been carried out with micro-Raman measurements. Subtracted shifted Raman spectroscopy methods have been employed to resolve the signals in the presence of fluorescence. Taking advantage of the vibrational assignments based on recent ab initio calculations of aluminum-complexes of anthraquinones, the approach allowed the discriminate between anthraquinone dyes and lakes based on kermesic and carminic acids present in the studied samples for the first time without heavy sample treatment. (C) 2019 Elsevier B.V. All rights reserved.
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