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  • 1.
    Abrahamsson, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Oliveira, Janaína Gonçalves de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Prototype of electric driveline with magnetically levitated double wound motor2010In: Electrical Machines (ICEM), 2010 XIX International Conference on, 2010Conference paper (Refereed)
    Abstract [en]

    This paper presents the ongoing work of constructing a complete driveline for an electric road vehicle, using a flywheel as auxiliary energy storage. The flywheel energy storage system (FESS) is connected in series between the main energy storage (batteries) and the wheel motor of the vehicle, allowing the batteries to deliver power to the system in an optimized way, while at the same time making efficient use of regenerative braking. A double wound permanent magnet electric machine is used to electrically separate the two sides. In order to minimize losses, the machine has a double rotor configuration and is suspended with magnetic bearings. A bench test set-up is being constructed to investigate the properties of this system in detail. This set-up will achieve a level of power and energy close to that of a full scale system. This will allow measurements of complete drive cycles to be performed, improving the understanding of the constituting components and optimization of the complete system.

  • 2.
    Abrahamsson, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Gonçalves de Oliveira, Janaína
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    On the Efficiency of a Two-Power-Level Flywheel-Based All-Electric Driveline2012In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 5, no 8, p. 2794-2817Article in journal (Refereed)
    Abstract [en]

    This paper presents experimental results on an innovative electric driveline employing a kinetic energy storage device as energy buffer. A conceptual division of losses in the system was created, separating the complete system into three parts according to their function. This conceptualization of the system yielded a meaningful definition of the concept of efficiency. Additionally, a thorough theoretical framework for the prediction of losses associated with energy storage and transfer in the system was developed. A large number of spin-down tests at varying pressure levels were performed. A separation of the measured data into the different physical processes responsible for power loss was achieved from the corresponding dependence on rotational velocity. This comparison yielded an estimate of the perpendicular resistivity of the stranded copper conductor of 2.5 x 10(-8) +/- 3.5 x 10(-9). Further, power and energy were measured system-wide during operation, and an analysis of the losses was performed. The analytical solution was able to reproduce the measured distribution of losses in the system to an accuracy of 4.7% (95% CI). It was found that the losses attributed to the function of kinetic energy storage in the system amounted to between 45% and 65%, depending on usage.

  • 3.
    Borsche, Theodor S.
    et al.
    Swiss Fed Inst Technol, Dept Elect Engn & Informat, Power Syst Lab, CH-8092 Zurich, Switzerland.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Andersson, Göran
    Swiss Fed Inst Technol, Dept Elect Engn & Informat, Power Syst Lab, CH-8092 Zurich, Switzerland.
    Stochastic control of cooling appliances under disturbances for primary frequency reserves2016In: Sustainable Energy, Grids and Networks, ISSN 0284-4354, E-ISSN 2352-4677, Vol. 7, p. 70-79Article in journal (Refereed)
    Abstract [en]

    To stabilize power system frequency both in normal operation and after a contingency, a hierarchy of distributed-proportional and centralized-integral controllers is employed in most power systems. Providing proportional control–commonly referred to as primary frequency control or droop–with conventional generators constitutes significant cost. This led to strong interest in utilizing demand response as a cost-effective primary control reserve. This paper investigates an approach that allows a population of domestic refrigerators to reliably and continuously adjust its demand proportional to system frequency. The control relies exclusively on stochastic switching of refrigerators, and thus avoids synchronization and implementation issues associated with control strategies based on temperature-band adjustments. The scheme is tested on a realistic two-area power system model to investigate interaction with system frequency. The modeling of refrigerators is refined by analyzing the effect of door openings on cooling demand, and response of the refrigerator population under these conditions is described both analytically and with simulations.

  • 4.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Electric driveline research status in Uppsala University2015Conference paper (Other academic)
  • 5.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Research on IPM motors at Uppsala University2018Conference paper (Other academic)
  • 6.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    3D FEM modeling of ironless Axial Flux Permanent Magnet motor/generators2011In: Journal of Electrical and Electronics Engineering, ISSN 1844-6035, Vol. 4, no 1, p. 53-58Article in journal (Refereed)
  • 7.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Calculation of Tooth Ripple Losses in Solid Poles2015In: Electric power components and systems, ISSN 1532-5008, E-ISSN 1532-5016, Vol. 43, no 3, p. 245-251Article in journal (Refereed)
    Abstract [en]

    Tooth ripple losses in solid salient poles are calculated with analytical and semi-empirical methods. A numerical method based on the finite element method is presented in this article. The distribution of the eddy currents induced by the tooth ripple is obtained with this new method. The traditional analytic approach is based on some assumptions on the eddy current losses distribution that are finally verified with the Finite Element Method simulations presented. Analytic solutions of tooth ripple losses are only applicable to distributed windings with a homogeneous slot pitch while the method presented is applicable both to distributed and concentrated windings.

  • 8.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Comparison between axial and radial flux PM coreless machines for flywheel energy storage2010In: Journal of Electrical Systems, ISSN 1112-5209, Vol. 6, no 2Article in journal (Refereed)
    Abstract [en]

    The need of a deeper understanding of coreless machines arises with new magnetic materials with higher remanent magnetization and the spread of high speed motors and generators. High energy density magnets allow complete ironless stator motor/generators configurations which are suitable for high speed machines and specifically in flywheel energy storage. Axial-flux and radial-flux machines are investigated and compared. The limits and merits of ironless machines are presented. An analytic solution of Maxwell’s equations is used to calculate the properties of axial-flux and radial-flux ironless generators. This method is used to investigate the influence of several parameters such as diameter and airgap width. Two machines have been calculated with FEM techniques and results are compared to validate the analytic method. Simulations conclude that end winding effects are more significant for axial-flux than for radialflux topologies. Radial-flux machines are more suitable for high speed ironless stators. The optimum values of some machine parameters are significantly different for ironless machines in comparison to slotted and slotless machines, such as outer radius to inner radius for axial-flux topologies. High speed coreless machines for energy storage and other applications required 3D FEM analysis for accurate results.

  • 9.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Tooth Ripple Losses in Solid Salient Poles Review and Generalization Method for Concentrated Windings MachinesIn: IEEE transactions on energy conversion, ISSN 0885-8969, E-ISSN 1558-0059Article in journal (Refereed)
    Abstract [en]

    This paper presents a numerical method for rotor losses in solid salient poles calculation based on FEM. All literature available in the field refers to distributed windings with a homogeneous slot pitch. The method presented is applicable both to distributed and concentrated windings. A numerical analysis based on a concentrated winding machine is presented.

  • 10.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Ekergård, Boel
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Eriksson, Sandra
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Ferhatovic, Senad
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Waters, Rafael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Leijon, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Electrical Motor Drivelines in Commercial All Electric Vehicles: a Review2012In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 61, no 2, p. 475-484Article in journal (Refereed)
    Abstract [en]

    This paper presents a critical review of the drivelines in all Electric Vehicles (EVs). The motor topologies that are the best candidates to be used in EVs are presented. The advantages and disadvantages of each electric motor type are discussed from a system perspective. A survey of the electric motors used in commercial EVs is presented. The survey shows that car manufacturers are very conservative when it comes to introducing new technologies. Most of the EV’s in the market mount a single induction or permanent magnet motor with a traditional mechanic driveline with a differential. The study illustrates that comparisons between the different motors are made difficult by the large number of parameters and the lack of a recommended test scheme. The authors propose that a standardized drive cycle is used to test and compare motors.

  • 11.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Goncalves de Oliveira, Janaina
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Filter Influence on Rotor Losses in Coreless Axial Flux Permanent Magnet Machines2013In: Advances in Electrical and Computer Engineering, ISSN 1582-7445, E-ISSN 1844-7600, Vol. 13, no 1, p. 81-86Article in journal (Refereed)
    Abstract [en]

    This paper investigates the eddy current losses induced in the rotor of coreless Axial-Flux machines. The calculation of eddy currents in the magnets requires the simulation of the inverter and the filter to obtain the harmonic content of the stator currents and FEM analysis of the magnets in the rotor. Due to the low inductance in coreless machines, the induced eddy current losses in the rotor remain lower than in traditional slotted machines. If only machine losses are considered, filters in DC/AC converters are not required in machines with wide airgaps as time harmonic losses in the rotor are very low. The harmonic content both from simulations and experimental results of a DC/AC converter are used to calculate the eddy currents in the rotor magnets. The properties of coreless machine topologies are investigated and some simplifications are proposed for time efficient 3D-FEM analysis. The time varying magnetic field can be considered constant over the magnets when the pole is divided in several magnets. The simplified FEM method to calculate eddy current losses is applicable to coreless machines with poles split into several magnets, although the conclusions are applicable to all coreless and slotless motors and generators.

  • 12.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Gonçalves de Oliveira, Janaína
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Electric Machine Topologies in Energy Storage Systems2010In: Energy Storage / [ed] Md. Rafiqul Islam Sheikh, Sciyo , 2010, p. 1-18Chapter in book (Refereed)
  • 13.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Larsson, Anders
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Dual voltage driveline for vehicle applications2010In: International Journal of Emerging Electric Power Systems, ISSN 2194-5756, E-ISSN 1553-779X, Vol. 11, no 3, p. 20 pp.-Article in journal (Refereed)
    Abstract [en]

    This paper presents a novel driveline where the load and the energy source are operated at different voltage levels and they are galvanically insulated. The element that couples both part of the driveline is a Two Voltage Level Machine (TVLM). The machine is formed of a self-excited rotor and a stator with two sets of electrically isolated windings for adjustable speed drive applications. Both sets of these three phase windings are independently operated at different voltages. The equivalent circuit of the TVLM is deduced and phasor diagrams are presented. A complete driveline is simulated and the performance of the complete system is discussed. The driveline is applicable in flywheel energy storage systems for vehicles and power conditioning in renewable energy production.

  • 14.
    de Santiago, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Rodriguez-Vialon, Osvaldo
    ETH Zurich, EEH-Power Systems Laboratory, Physikstrasse 3 ETLG29, 8092 Zurich, Switzerland..
    Sicre, Benoit
    HSLU Lucerne, Hochschule Luzern – Technik & Architektur, Centre for Integrated Building Technology, Technikumstrasse 21, 6048 Horw, Switzerland..
    The Generation of Domestic Hot Water Load Profiles in Swiss Residential Buildings through Statistical Predictions2017In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 141, p. 341-348Article in journal (Refereed)
    Abstract [en]

    A long-term field study recording domestic hot water (DHW) consumption in households was used to tune a load profile generator. The methodology used in this load profile generator is also applicable to electric loads in distribution grids. Accurate DHW load profiles are essential to estimate the performance of renewable energy systems. One day and long-term randomly generated DHW profiles are useful for simulation, sizing and optimization of components in solar hot water installations such as storage tank, heat exchanger, collector area and additional heater. This work is also relevant to create standards for product testing and certification.

    DHW usage and draw off patterns are geographically dependent, so recent and local measurements are required to tune models and create accurate load profiles.

    Measurements show that DHW consumption is very volatile. The daily average value varies from 20 to 40 l per person (60 °C outlet temperature). The profiles underlie some trends (predominantly consumption in the morning or in the evening or spread over the day). The DHW consumption in Switzerland follows similar patterns observed in other countries, such as no significant decrease in consumption during weekends, and no strong correlation with weather conditions neither outdoor temperature nor rain.

  • 15.
    de Santiago Ochoa, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Demand response for renewable energy integration2017Conference paper (Refereed)
    Abstract [en]

    Renewable energy sources are intermittent and not dispatchable. The increase in wind and solar power creates new demands in the regulation at different time scales. Here, two projects on demand response developed at Uppsala University are presented. Short term mismatches between production and consumption leads to deviations in the grid frequency. The contribution of cooling appliances in the frequency regulation has been studied. Electric Energy Time-shift requires some sort of energy storage with slow dynamics. HSLU in Switzerland is investigating the use of electric water heaters as a thermal energy storage system to balance wind power production. Uppsala University contributed with the analysis of hot water consumption profiles for system sizing.

  • 16.
    de Santiago Ochoa, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    FEM Analysis Applied to Electric Machines for Electric Vehicles2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Electric vehicle technology is an interdisciplinary field in continuous development. It appears to be a margin for improvements. The Division for Electricity at Uppsala University is doing significant research in the field. The present thesis investigates electric machines for vehicular applications, both in the driveline and in the traction motor.

    Section 1 presents a driveline with two galvanically isolated voltage levels. A low power side is operated at the optimum voltage of the batteries, while a high power side is operated at a higher voltage leading to higher efficiencies in the traction motor. Both sides are coupled through a flywheel that stabilizes the power transients inherent to a drive cycle.

    A review of electric machine topologies for electric vehicles is presented in Section 2. The permanent magnet excited machine is the most suitable technology for an electric driveline.

    Section 3 is devoted to numerical models applied to electric machines. The equivalent circuit of a motor/generator with two sets of windings is first presented. This machine couples both sides of the driveline and drives the rotor of the flywheel. The electric parameters are calculated with custom FEM models. A discussion on slotless machines concludes with a simple model to analyze the magnetic field from one static 3D simulation. The tooth ripple losses in solid salient poles are also analyzed with a novel FEM approach. A complete description of the losses in electric machines gives a proper background for further discussion on efficiency.

    Section 4 presents the experimental work constructed to validate the theoretical models. The experiments include an axial flux, single wounded prototype, an axial flux, double wound prototype and a planed radial flux coreless prototype.

    Section 5 focuses on traction motors for electric vehicles. A simulated prototype illustrates a design and calculation process. The loss theory and the numerical methods presented in Section 3 are applied.

    List of papers
    1. Design Parameters Calculation of a Novel Driveline for Electric Vehicles
    Open this publication in new window or tab >>Design Parameters Calculation of a Novel Driveline for Electric Vehicles
    Show others...
    2009 (English)In: World Electric Vehicle Journal, ISSN 2032-6653, Vol. 3Article in journal (Refereed) Published
    Abstract [en]

    A driveline for electric vehicles is presented. The propulsion system is operated at a higher voltage than the primary energy source. The batteries selected as the primary energy source deliver power to the vehicle through a motor-generator wounded with two electrically isolated sets of windings, named Two Voltage Level Machine (TVLM). The dynamic behaviour of a vehicle operating according to a standard drive cycle is studied. Parameters of the driveline such as power rates and size of the flywheel are obtained by optimization. A description of the performance of a TVLM is also presented through its equivalent circuit and the control of the machine. Special attention to the system losses is presented. A scale prototype has been constructed and tested under a drive cycle, demonstrating the system performance of the system.

    Keywords
    Flywheel, Electric driveline, Regenerative braking, Simulation
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-113157 (URN)ISSN 2032-6653 (ISBN)
    Available from: 2010-01-25 Created: 2010-01-25 Last updated: 2018-05-30Bibliographically approved
    2. Comparison between axial and radial flux PM coreless machines for flywheel energy storage
    Open this publication in new window or tab >>Comparison between axial and radial flux PM coreless machines for flywheel energy storage
    2010 (English)In: Journal of Electrical Systems, ISSN 1112-5209, Vol. 6, no 2Article in journal (Refereed) Published
    Abstract [en]

    The need of a deeper understanding of coreless machines arises with new magnetic materials with higher remanent magnetization and the spread of high speed motors and generators. High energy density magnets allow complete ironless stator motor/generators configurations which are suitable for high speed machines and specifically in flywheel energy storage. Axial-flux and radial-flux machines are investigated and compared. The limits and merits of ironless machines are presented. An analytic solution of Maxwell’s equations is used to calculate the properties of axial-flux and radial-flux ironless generators. This method is used to investigate the influence of several parameters such as diameter and airgap width. Two machines have been calculated with FEM techniques and results are compared to validate the analytic method. Simulations conclude that end winding effects are more significant for axial-flux than for radialflux topologies. Radial-flux machines are more suitable for high speed ironless stators. The optimum values of some machine parameters are significantly different for ironless machines in comparison to slotted and slotless machines, such as outer radius to inner radius for axial-flux topologies. High speed coreless machines for energy storage and other applications required 3D FEM analysis for accurate results.

    Keywords
    Flux density, High-speed PM electric machine, Magnetic devices, Optimum design, Permanent Magnets Synchronous Machine (PMSM).
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-140351 (URN)
    Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2016-04-18Bibliographically approved
    3. Dual voltage driveline for vehicle applications
    Open this publication in new window or tab >>Dual voltage driveline for vehicle applications
    2010 (English)In: International Journal of Emerging Electric Power Systems, ISSN 2194-5756, E-ISSN 1553-779X, Vol. 11, no 3, p. 20 pp.-Article in journal (Refereed) Published
    Abstract [en]

    This paper presents a novel driveline where the load and the energy source are operated at different voltage levels and they are galvanically insulated. The element that couples both part of the driveline is a Two Voltage Level Machine (TVLM). The machine is formed of a self-excited rotor and a stator with two sets of electrically isolated windings for adjustable speed drive applications. Both sets of these three phase windings are independently operated at different voltages. The equivalent circuit of the TVLM is deduced and phasor diagrams are presented. A complete driveline is simulated and the performance of the complete system is discussed. The driveline is applicable in flywheel energy storage systems for vehicles and power conditioning in renewable energy production.

    Place, publisher, year, edition, pages
    USA: Berkeley Electronic Press, 2010
    Keywords
    drives, renewable energy sources, rotors, stators, vehicles
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-140362 (URN)10.2202/1553-779X.2384 (DOI)
    Note

    11478469 dual voltage driveline vehicle applications energy source two voltage level machine self-excited rotor self-excited stator power conditioning renewable energy production

    Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2017-12-11Bibliographically approved
    4. A Double Wound Flywheel System under Standard Drive Cycles: Simulations and Experiments
    Open this publication in new window or tab >>A Double Wound Flywheel System under Standard Drive Cycles: Simulations and Experiments
    2010 (English)In: International Journal of Emerging Electric Power Systems, ISSN 1553-779X, Vol. 11, no 4, p. Article 6.-Article in journal (Refereed) Published
    Abstract [en]

    Flywheel systems are attractive for use in electric vehicles, being able to efficiently handle the large power needed for acceleration and regenerative braking. A double wound flywheel machine, divided in two different voltage levels by the windings, acting like a rotating transformer, is studied. The flywheel stator windings have two sides: a low voltage side connected to the battery and a high voltage side connected to the wheel motor. The load variations on the high voltage side have minimal affect on the low voltage side of the system, in which the speed control of the machine is performed. In this paper the functionality of the system is investigated by means of simulations and experiments. Different standard drive cycles are applied on the high voltage side to assess the effect of load variations in the system as a whole and particularly in the speed control. The response of the speed control system is investigated with computer simulations and experimental verification. The energy storage in the flywheel allows a steady power supply from the battery via the inverter, proving the functionality of the system.

    National Category
    Engineering and Technology
    Research subject
    Engineering Science with specialization in Science of Electricity
    Identifiers
    urn:nbn:se:uu:diva-140340 (URN)10.2202/1553-779X.2487 (DOI)
    Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2015-12-08Bibliographically approved
    5. 3D FEM modeling of ironless Axial Flux Permanent Magnet motor/generators
    Open this publication in new window or tab >>3D FEM modeling of ironless Axial Flux Permanent Magnet motor/generators
    2011 (English)In: Journal of Electrical and Electronics Engineering, ISSN 1844-6035, Vol. 4, no 1, p. 53-58Article in journal (Refereed) Published
    Place, publisher, year, edition, pages
    Oradea, Romania: Editura Universităţii din Oradea, 2011
    Keywords
    Axial Flux machine, Eddy currents, FEM
    National Category
    Engineering and Technology
    Research subject
    Engineering Science with specialization in Science of Electricity
    Identifiers
    urn:nbn:se:uu:diva-156738 (URN)
    Available from: 2011-08-08 Created: 2011-08-08 Last updated: 2016-04-19Bibliographically approved
    6. Losses in Axial-Flux Permanent-Magnet Coreless Flywheel Energy Storage Systems
    Open this publication in new window or tab >>Losses in Axial-Flux Permanent-Magnet Coreless Flywheel Energy Storage Systems
    Show others...
    2008 (English)Conference paper, Published paper (Refereed)
    Place, publisher, year, edition, pages
    Vilamoura, Portugal: , 2008
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-113430 (URN)
    Conference
    18th International Conference on Electrical Machines
    Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2016-04-12Bibliographically approved
    7. Filter influence in rotor losses in coreless axial flux permanent magnet machines
    Open this publication in new window or tab >>Filter influence in rotor losses in coreless axial flux permanent magnet machines
    (English)In: Journal of Electrical SystemsArticle in journal (Refereed) Submitted
    Identifiers
    urn:nbn:se:uu:diva-157069 (URN)
    Available from: 2011-08-15 Created: 2011-08-15 Last updated: 2011-11-03Bibliographically approved
    8. Tooth Ripple Losses in Solid Salient Poles Review and Generalization Method for Concentrated Windings Machines
    Open this publication in new window or tab >>Tooth Ripple Losses in Solid Salient Poles Review and Generalization Method for Concentrated Windings Machines
    (English)In: IEEE transactions on energy conversion, ISSN 0885-8969, E-ISSN 1558-0059Article in journal (Refereed) Submitted
    Abstract [en]

    This paper presents a numerical method for rotor losses in solid salient poles calculation based on FEM. All literature available in the field refers to distributed windings with a homogeneous slot pitch. The method presented is applicable both to distributed and concentrated windings. A numerical analysis based on a concentrated winding machine is presented.

    Keywords
    Eddy currents, finite-element analysis (FEA), magnetic losses, synchronous machines
    Identifiers
    urn:nbn:se:uu:diva-157860 (URN)
    Available from: 2011-08-24 Created: 2011-08-24 Last updated: 2017-12-08Bibliographically approved
    9. Electrical Motor Drivelines in Commercial All Electric Vehicles: a Review
    Open this publication in new window or tab >>Electrical Motor Drivelines in Commercial All Electric Vehicles: a Review
    Show others...
    2012 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 61, no 2, p. 475-484Article in journal (Refereed) Published
    Abstract [en]

    This paper presents a critical review of the drivelines in all Electric Vehicles (EVs). The motor topologies that are the best candidates to be used in EVs are presented. The advantages and disadvantages of each electric motor type are discussed from a system perspective. A survey of the electric motors used in commercial EVs is presented. The survey shows that car manufacturers are very conservative when it comes to introducing new technologies. Most of the EV’s in the market mount a single induction or permanent magnet motor with a traditional mechanic driveline with a differential. The study illustrates that comparisons between the different motors are made difficult by the large number of parameters and the lack of a recommended test scheme. The authors propose that a standardized drive cycle is used to test and compare motors.

    Keywords
    Motor drives, Road vehicle electric propulsion, Road vehicle power systems, Traction motors
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering
    Research subject
    Engineering Science with specialization in Science of Electricity
    Identifiers
    urn:nbn:se:uu:diva-157858 (URN)10.1109/TVT.2011.2177873 (DOI)000300427400005 ()
    Available from: 2012-04-19 Created: 2011-08-24 Last updated: 2017-12-08Bibliographically approved
  • 17.
    de Santiago Ochoa, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Goncalves de Oliveira, Janaína
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Abrahamsson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Larsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Design Parameters Calculation of a Novel Driveline for Electric Vehicles2009Conference paper (Refereed)
  • 18.
    de Santiago Ochoa, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Goncalves de Oliveira, Janaína
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Larsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Losses in Axial-Flux Permanent-Magnet Coreless Flywheel Energy Storage Systems2008Conference paper (Refereed)
  • 19.
    de Santiago Ochoa, Juan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Oliveira, Janaína Goncalves de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Abrahamsson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Larsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Design Parameters Calculation of a Novel Driveline for Electric Vehicles2009In: World Electric Vehicle Journal, ISSN 2032-6653, Vol. 3Article in journal (Refereed)
    Abstract [en]

    A driveline for electric vehicles is presented. The propulsion system is operated at a higher voltage than the primary energy source. The batteries selected as the primary energy source deliver power to the vehicle through a motor-generator wounded with two electrically isolated sets of windings, named Two Voltage Level Machine (TVLM). The dynamic behaviour of a vehicle operating according to a standard drive cycle is studied. Parameters of the driveline such as power rates and size of the flywheel are obtained by optimization. A description of the performance of a TVLM is also presented through its equivalent circuit and the control of the machine. Special attention to the system losses is presented. A scale prototype has been constructed and tested under a drive cycle, demonstrating the system performance of the system.

  • 20.
    Goncalves de Oliveira, Janaína
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    A Double Wound Flywheel System under Standard Drive Cycles: Simulations and Experiments2010In: International Journal of Emerging Electric Power Systems, ISSN 1553-779X, Vol. 11, no 4, p. Article 6.-Article in journal (Refereed)
    Abstract [en]

    Flywheel systems are attractive for use in electric vehicles, being able to efficiently handle the large power needed for acceleration and regenerative braking. A double wound flywheel machine, divided in two different voltage levels by the windings, acting like a rotating transformer, is studied. The flywheel stator windings have two sides: a low voltage side connected to the battery and a high voltage side connected to the wheel motor. The load variations on the high voltage side have minimal affect on the low voltage side of the system, in which the speed control of the machine is performed. In this paper the functionality of the system is investigated by means of simulations and experiments. Different standard drive cycles are applied on the high voltage side to assess the effect of load variations in the system as a whole and particularly in the speed control. The response of the speed control system is investigated with computer simulations and experimental verification. The energy storage in the flywheel allows a steady power supply from the battery via the inverter, proving the functionality of the system.

  • 21.
    Hasan, Shakib
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Luthander, Rasmus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    de Santiago Ochoa, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Reactive Power Control for LV Distribution Networks Voltage Management2018In: 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe), IEEE, 2018Conference paper (Refereed)
    Abstract [en]

    The high photovoltaic (PV) penetration into existing distribution networks leads to voltage profile violation. The main objective of this paper is to study the interaction of traditional static synchronous compensator (STATCOM) with the reactive power capable PV inverter in order to provide voltage support to the low voltage (LV) distribution network. In this paper, we propose an effective coordinated voltage control structure. The control structure has a hierarchical approach where reactive power compensation by PV inverters is prioritized. The STATCOMs are only used when the PV inverters are not capable enough to provide or consume enough reactive power to provide the voltage support. Also, we show that the reactive power supply at night by the PV inverters can be an important resource for effective voltage regulation by using this technique. Data from the existing LV distribution network are used for a case study. The simulation results indicate that the proposed voltage control method is able to control both the over and under voltage situations for the test distribution network without curtailing any active power from PV.

  • 22.
    Hedlund, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. Doktorand, Uppsala Universitet.
    Kamf, Tobias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Santiago, Juan de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Abrahamsson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Reluctance Machine for a Hollow Cylinder Flywheel2017In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 10, no 3, article id 316Article in journal (Refereed)
    Abstract [en]

    A hollow cylinder flywheel rotor with a novel outer rotor switched reluctance machine (SRM) mounted on the interior rim is presented, with measurements, numerical analysis and analytical models. Practical experiences from the construction process are also discussed. The flywheel rotor does not have a shaft and spokes and is predicted to store 181 Wh/kg at ultimate tensile strength (UTS) according to simulations. The novel SRM is an axial flux machine, chosen due to its robustness and tolerance for high strain. The computed maximum tip speed of the motor at UTS is 1050 m/s . A small-scale proof-of-concept electric machine prototype has been constructed, and the machine inductance has been estimated from measurements of voltage and current and compared against results from analytical models and finite element analysis (FEA). The prototype measurements were used to simulate operation during maximal speed for a comparison towards other high-speed electric machines, in terms of tip speed and power. The mechanical design of the flywheel was performed with an analytical formulation assuming planar stress in concentric shells of orthotropic (unidirectionally circumferentially wound) carbon composites. The analytical approach was verified with 3D FEA in terms of stress and strain.

  • 23.
    Hedlund, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Abrahamsson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Flywheel Energy Storage for Automotive Applications2015In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 8, no 10, p. 10636-10663Article, review/survey (Refereed)
    Abstract [en]

    A review of flywheel energy storage technology was made, with a special focus on the progress in automotive applications. We found that there are at least 26 university research groups and 27 companies contributing to flywheel technology development. Flywheels are seen to excel in high-power applications, placing them closer in functionality to supercapacitors than to batteries. Examples of flywheels optimized for vehicular applications were found with a specific power of 5.5 kW/kg and a specific energy of 3.5 Wh/kg. Another flywheel system had 3.15 kW/kg and 6.4 Wh/kg, which can be compared to a state-of-the-art supercapacitor vehicular system with 1.7 kW/kg and 2.3 Wh/kg, respectively. Flywheel energy storage is reaching maturity, with 500 flywheel power buffer systems being deployed for London buses (resulting in fuel savings of over 20%), 400 flywheels in operation for grid frequency regulation and many hundreds more installed for uninterruptible power supply (UPS) applications. The industry estimates the mass-production cost of a specific consumer-car flywheel system to be 2000 USD. For regular cars, this system has been shown to save 35% fuel in the U.S. Federal Test Procedure (FTP) drive cycle.

  • 24.
    Hedlund, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Stephan, Richard. M.
    Univ. Fed. Rio de Janeiro, Brazil.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Goncalves de Oliveira, Janaína
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Rodriguez, Elkin
    Univ. Fed. Rio de Janeiro, Brazil.
    Sotelo, Guilherme G.
    Univ Fed Fluminense, Brazil.
    Eigen frequency and damping in a passive magnetic bearing system2016Conference paper (Refereed)
    Abstract [en]

    A complete passive magnetic bearing system, consisting in a Permanent Magnet radial bearing and a Superconductive Magnetic Bearing has been simulated and constructed. The forces in both types of magnetic bearings are not linear. The non-linear behavior has been implemented in a FEM model and compared with linear models. A spin down test has been conducted to the built system and the Eigen frequencies have been recorded. The Eigen frequencies calculated with and without the non-linear behavior implemented in the model are very similar.

  • 25.
    Larsson, Anders
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Hogdin, Simon
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Santiago, Juan de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bolund, Björn
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Nyholm, S. E
    Construction, modelling and evaluation of a low-loss motor/generator for flywheel energy storage2007Conference paper (Refereed)
  • 26.
    Leijon, Mats
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Ekergård, Boel
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Apelfröjd, Senad
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Waters, Rafael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Eriksson, Sandra
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    On a Two Pole Motor for Electric Propulsion System2013In: International Journal of Engineering Science and Innovative Technology, ISSN 2319 - 5967, Vol. 2, no 1, p. 99-111Article in journal (Refereed)
  • 27.
    Lundin, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Kamf, Tobias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Abrahamsson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Santiago, Juan de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Hedlund, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bernhoff, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    High Speed Flywheels for Vehicular Applications2014In: 14th International Symposium on Magnetic Bearings, Linz, Austria, 2014Conference paper (Refereed)
  • 28.
    Pérez-Loya, Jesus José
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lundin, Urban
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Construction of a Permanent Magnet Thrust Bearing for a Hydropower Generator Test Setup2013Conference paper (Refereed)
  • 29. Rodriguez, Elkin
    et al.
    Pérez-Loya, Jesus José
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Santiago, Juan de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Costa, Felipe S
    Sotelo, Guilherme G
    Goncalves de Oliveira, Janaina
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Stephan, R. M.
    Passive Magnetic Bearing System2014Conference paper (Refereed)
  • 30. Rodriguez, Elkin
    et al.
    Santiago, Juan de
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Pérez-Loya, Jesus José
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Costa, Felipe S
    Sotelo, Guilherme G
    Goncalves de Oliveira, Janaina
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Stephan, Richard M
    Analysis of passive magnetic bearings for kinetic energy storage systems2014Conference paper (Refereed)
  • 31.
    Rodriguez, Elkin
    et al.
    Univ Fed Rio de Janeiro, Rio De Janeiro, RJ, Brazil..
    Sotelo, Guilherme G.
    Univ Fed Fluminense, Niteroi, RJ, Brazil..
    de Oliveira, Janaina G.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. Univ Fed Juiz de Fora, Juiz De Fora, MG, Brazil..
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Rossander, Morgan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Stephan, Richard M.
    Univ Fed Rio de Janeiro, Rio De Janeiro, RJ, Brazil..
    Designing, simulations and experiments of a passive permanent magnet bearing2016In: International journal of applied electromagnetics and mechanics, ISSN 1383-5416, E-ISSN 1875-8800, Vol. 51, no 2, p. 131-149Article in journal (Refereed)
    Abstract [en]

    This paper presents simulations and experimental results for two types of Passive Permanent Magnet Bearings. The bearing system under investigation consists of two permanent magnet rings opposing to each other in two different configurations. The influence of parameters, such as thickness and radius of permanent magnets, in the force is presented through FEM calculations. Two setups of passive magnetic bearings have been built. Static measurements of radial and axial forces are reported and results compared with simulations. Also, dynamic tests show the behavior of the bearing and the magnitudes of force in the foothold. The results are presented to show trends in the parameters, so the conclusions are applicable for other sizes and applications. As an example, the application as a top bearing for a 12 kW vertical axis wind turbine is considered.

  • 32.
    Rojas-Delgado, Brenda
    et al.
    Electrical Engineering Department, Universidad Carlos III de Madrid, 28911 Madrid, Spain.
    Alonso, Monica
    Electrical Engineering Department, Universidad Carlos III de Madrid, 28911 Madrid, Spain.
    Amaris, Hortensia
    Electrical Engineering Department, Universidad Carlos III de Madrid, 28911 Madrid, Spain.
    de Santiago, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Wave Power Output Smoothing through the Use of a High-Speed Kinetic Buffer2019In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 11, article id 2196Article in journal (Refereed)
    Abstract [en]

    In this paper, a new control strategy for power output smoothing in a hybrid wave energyinstallation coupled to a flywheel energy storage system (FESS) is proposed. The control schemeis composed by three stages: a wave generator clustering process at the farm connection point;a power filtering process; and the control of the flywheel energy storage in order to improve thepower output of the hybrid wave farm. The proposed control is validated at the existing LysekilWave Energy Site located in Sweden, by using real generator measurements. Results show that theapplication of the flywheel energy storage system reduces the maximum peak power output fromthe wave energy installation by 85% and the peak/average power ratio by 76%. It is shown thatthe proposed system can reduce grid losses by 51%, consequently improving the energy efficiencyof the power network. The application of the proposed control strategy allows the hybrid wavepower plant to follow a power reference signal that is imposed by the grid operator. In addition,the study demonstrates that the application of the proposed control allows the hybrid wave powerplant to follow a power reference signal that is imposed by the grid operator. In addition, the studydemonstrates that the application of the proposed control enables a wave farm with flywheel energystorage to be a controllable, flexible resource in order to fulfill future grid code requirements formarine energy installations.

  • 33. Santiago, Juan de
    et al.
    Burmeister, Florian
    Lundin, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Oliveira, Janaina Goncalves de
    A Power Buffer in an Electric Driveline: Two Batteries Are Better Than One2014In: ISRN Automotive Engineering, Vol. 2014, p. 9-Article in journal (Refereed)
    Abstract [en]

    Fuel cells and high energy density batteries have limited overrated capacity and slow power response. Ultracapacitors and flywheels are proposed to overcome these limitations and to facilitate regenerative braking in hybrid and electric vehicles. The simulations presented in this paper show that a Secondary Energy Storage Unit (SESU) enhances the performance of the drivelines as previously suggested and provides additional improvements. A combined design of the primary energy source and the SESU reduces the total weight and volume and increases the battery lifetime. A full-electric driveline is simulated using a standard EPA FTP-75 drive cycle. Then the same vehicle is simulated with as SESU and the results are compared. The same is done for a hybrid driveline. Two drivelines are used as references and then enhanced with an SESU; four simulations are presented in total. Simulation results show that an energy storage device with very low energy and high power allows better battery selection and energy management.

  • 34.
    Theodoro, Thainan S.
    et al.
    Federal University of Juiz de Fora, Department of Electrical Engineering, Brazil.
    Tomim, Marcelo A.
    Federal University of Juiz de Fora, Department of Electrical Engineering, Brazil.
    Barbosa, Pedro G.
    Federal University of Juiz de Fora, Department of Electrical Engineering, Brazil.
    Lima, Antonio C.S.
    Federal University of Rio de Janeiro, Department of Electrical Engineering, Brazil.
    de Santiago Ochoa, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    A Hybrid Simulation Tool for Distributed Generation Integration Studies2018In: 2018 Power Systems Computation Conference (PSCC) / [ed] IEEE, Dublin, Ireland: IEEE conference proceedings, 2018Conference paper (Refereed)
    Abstract [en]

    This work presents a hybrid simulation tool thatcombines fast analysis of quasi-static time series or transient stability programs and electromagnetic transients ones to evaluatethe dynamic behaviour of electric power systems with distributedgeneration sources. The interaction between the two programs isperformed by means of controllable current and voltage sources,which are used to interface external and detailed systems. Thedouble second order generalized integrator (DSOGI) is used toextract the positive-sequence phasor from the detailed systemto the external one. A local network server controls the datacommunication between the two simulation environments bymeans of the TCP/IP protocol. In the present paper, the proposedtool is used to simulate the integration of a wind power plant,based on a doubly-fed induction generator (DFIG), into a 29-bus electrical network. Results and computational timings arethen compared with the ones obtained with an electromagnetictransients program, which demonstrate the accuracy and speedof the proposed strategy.

  • 35.
    Vieira, Thomas
    et al.
    Univ Fed Juiz de Fora, Fac Engn, Dept Energia Eletr, Juiz de Fora, MG, Brazil..
    Miranda, Breno B.
    Univ Fed Juiz de Fora, Fac Engn, Dept Energia Eletr, Juiz de Fora, MG, Brazil..
    Monteiro, Vinicius E.
    Univ Fed Juiz de Fora, Fac Engn, Dept Energia Eletr, Juiz de Fora, MG, Brazil..
    Goncalves, Carlos G. V.
    Univ Fed Juiz de Fora, Fac Engn, Dept Energia Eletr, Juiz de Fora, MG, Brazil..
    Almeida, Pedro S.
    Univ Fed Juiz de Fora, Fac Engn, Dept Energia Eletr, Juiz de Fora, MG, Brazil..
    Oliveira, Janaina G.
    Univ Fed Juiz de Fora, Fac Engn, Dept Energia Eletr, Juiz de Fora, MG, Brazil..
    Rodriguez, Elkin
    Univ Fed Rio de Janeiro, Dept Engn Eletr, Rio de Janeiro, RJ, Brazil..
    de Santiago Ochoa, Juan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Development of an axial flux machine and control: simulation and experimental set up2016In: 2016 12th IEEE/IAS International Conference On Industry Applications (INDUSCON), 2016Conference paper (Refereed)
    Abstract [en]

    Simulation and experimental development of a driving system and control for an axial flux permanent magnet machine has been developed. The complete system, including the machine design and construction, has been accomplished due to the collaboration among different universities in Brazil and Sweden. Final experimental setup is aimed for testing a passive levitation system, which can be used as small flywheel energy storage. Simulations have been implemented using Simulink. The design and construction of different components of the driving system are presented, in a way so they can be reproduced. Control strategy has been implemented using Labview and Compact-Rio. Results show the functionality of the complete system at a nominal speed of 2800 rpm.

1 - 35 of 35
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