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de Santiago Ochoa, JuanORCID iD iconorcid.org/0000-0002-5361-7739
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Publications (10 of 36) Show all publications
de Santiago Ochoa, J. & Oliveira, J. G. (2020). Regenerative Braking for Energy Recovering in Diesel-Electric Freight Trains: A Technical and Economic Evaluation. Energies, 13(4)
Open this publication in new window or tab >>Regenerative Braking for Energy Recovering in Diesel-Electric Freight Trains: A Technical and Economic Evaluation
2020 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 13, no 4Article in journal (Refereed) Published
Abstract [en]

The present work evaluates the application of regenerative braking for energy recovery in diesel-electric freight trains to increase efficiency and to improve decarbonization. The energy from regenerative braking has to be stored onboard when the track is not electrified. Different technologies of energy recovery are presented and discussed. The energy balance of an existing route is presented and simulated for different battery sizes. The analysis is illustrated with experimental data from an important Brazilian railway. Results show that the energy recovery from regenerative brake is a feasible investment and may be recommended to increase the efficiency in transportation and also to improve the low carbon mobility in railway systems.

Keywords
regenerative braking; energy storage; railway; economic feasibility
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-404622 (URN)10.3390/en13040963 (DOI)
Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-03-23
Rojas-Delgado, B., Alonso, M., Amaris, H. & de Santiago, J. (2019). Wave Power Output Smoothing through the Use of a High-Speed Kinetic Buffer. Energies, 12(11), Article ID 2196.
Open this publication in new window or tab >>Wave Power Output Smoothing through the Use of a High-Speed Kinetic Buffer
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 11, article id 2196Article in journal (Refereed) Published
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.

Keywords
wave energy, energy storage, flywheel, power take off (PTO), flywheel energy storage system (FESS)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-385125 (URN)10.3390/en12112196 (DOI)000472635900163 ()
Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-08-26Bibliographically approved
Theodoro, T. S., Tomim, M. A., Barbosa, P. G., Lima, A. C. .. & de Santiago Ochoa, J. (2018). A Hybrid Simulation Tool for Distributed Generation Integration Studies. In: IEEE (Ed.), 2018 Power Systems Computation Conference (PSCC): . Paper presented at 2018 Power Systems Computation Conference (PSCC), Dublin, June 11-15, 2018.. Dublin, Ireland: IEEE conference proceedings
Open this publication in new window or tab >>A Hybrid Simulation Tool for Distributed Generation Integration Studies
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2018 (English)In: 2018 Power Systems Computation Conference (PSCC) / [ed] IEEE, Dublin, Ireland: IEEE conference proceedings, 2018Conference paper, Published 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.

Place, publisher, year, edition, pages
Dublin, Ireland: IEEE conference proceedings, 2018
Keywords
Hybrid simulation, Co-simulation, Electromagnetic transients, Transient stability, Distributed generation penetration
National Category
Computer Systems
Identifiers
urn:nbn:se:uu:diva-362130 (URN)10.23919/PSCC.2018.8442867 (DOI)000447282400139 ()978-1-910963-10-4 (ISBN)
Conference
2018 Power Systems Computation Conference (PSCC), Dublin, June 11-15, 2018.
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-12-17Bibliographically approved
Hasan, S., Luthander, R. & de Santiago Ochoa, J. (2018). Reactive Power Control for LV Distribution Networks Voltage Management. In: 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe): . Paper presented at IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe),Sarajevo, Bosnia and Herzegovina, October 21-25, 2018. IEEE
Open this publication in new window or tab >>Reactive Power Control for LV Distribution Networks Voltage Management
2018 (English)In: 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe), IEEE, 2018Conference paper, Published 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.

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE PES Innovative Smart Grid Technologies Conference Europe, ISSN 2165-4816
Keywords
Photovoltaic (PV), Low voltage (LV), PV inverter, static synchronous compensator (STATCOM), Reactive power control, Voltage control
National Category
Energy Engineering
Identifiers
urn:nbn:se:uu:diva-377034 (URN)10.1109/ISGTEurope.2018.8571817 (DOI)000458690200172 ()978-1-5386-4505-5 (ISBN)
Conference
IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe),Sarajevo, Bosnia and Herzegovina, October 21-25, 2018
Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-03-08Bibliographically approved
de Santiago, J. (2018). Research on IPM motors at Uppsala University. In: : . Paper presented at Thematic workshop on automotive electric drives, Stockholm 2018..
Open this publication in new window or tab >>Research on IPM motors at Uppsala University
2018 (English)Conference paper, Oral presentation only (Other academic)
Keywords
Swedish Electromobility Center, StandUP for Energy, Electric motors
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-346817 (URN)
Conference
Thematic workshop on automotive electric drives, Stockholm 2018.
Funder
StandUp
Available from: 2018-03-21 Created: 2018-03-21 Last updated: 2018-03-22Bibliographically approved
de Santiago Ochoa, J. (2017). Demand response for renewable energy integration. In: : . Paper presented at Elkraft 2017, Chalmers Konferenscentrum 17‐18 Maj 2017, Göteborg (pp. 1-1).
Open this publication in new window or tab >>Demand response for renewable energy integration
2017 (English)Conference paper, Poster (with or without abstract) (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.

Keywords
demand response, renewable energy, load balancing
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering with specialization in Systems Analysis
Identifiers
urn:nbn:se:uu:diva-322380 (URN)
Conference
Elkraft 2017, Chalmers Konferenscentrum 17‐18 Maj 2017, Göteborg
Funder
StandUp
Available from: 2017-05-20 Created: 2017-05-20 Last updated: 2017-12-29Bibliographically approved
Hedlund, M., Kamf, T., Santiago, J. d., Abrahamsson, J. & Bernhoff, H. (2017). Reluctance Machine for a Hollow Cylinder Flywheel. Energies, 10(3), Article ID 316.
Open this publication in new window or tab >>Reluctance Machine for a Hollow Cylinder Flywheel
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2017 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 10, no 3, article id 316Article in journal (Refereed) Published
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.

Keywords
flywheel energy storage, hollow cylinder flywheel, reluctance machine, high-speed machines
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-317875 (URN)10.3390/en10030316 (DOI)000398736700056 ()
Available from: 2017-03-21 Created: 2017-03-21 Last updated: 2017-11-29Bibliographically approved
de Santiago, J., Rodriguez-Vialon, O. & Sicre, B. (2017). The Generation of Domestic Hot Water Load Profiles in Swiss Residential Buildings through Statistical Predictions. Energy and Buildings, 141, 341-348
Open this publication in new window or tab >>The Generation of Domestic Hot Water Load Profiles in Swiss Residential Buildings through Statistical Predictions
2017 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 141, p. 341-348Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
DHW, Heat demands, Consumption profiles, Demand modeling, Survey
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-320674 (URN)10.1016/j.enbuild.2017.02.045 (DOI)000400212400029 ()
Funder
StandUp
Available from: 2017-04-23 Created: 2017-04-23 Last updated: 2017-06-26Bibliographically approved
Rodriguez, E., Sotelo, G. G., de Oliveira, J. G., de Santiago, J., Rossander, M. & Stephan, R. M. (2016). Designing, simulations and experiments of a passive permanent magnet bearing. International journal of applied electromagnetics and mechanics, 51(2), 131-149
Open this publication in new window or tab >>Designing, simulations and experiments of a passive permanent magnet bearing
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2016 (English)In: International journal of applied electromagnetics and mechanics, ISSN 1383-5416, E-ISSN 1875-8800, Vol. 51, no 2, p. 131-149Article in journal (Refereed) Published
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.

Keywords
Permanent magnetic bearing, finite element method, vertical axis bearing
National Category
Applied Mechanics
Identifiers
urn:nbn:se:uu:diva-299628 (URN)10.3233/JAE-150162 (DOI)000377871000004 ()
Funder
Swedish Research CouncilStandUp
Available from: 2016-07-25 Created: 2016-07-25 Last updated: 2017-11-28Bibliographically approved
Vieira, T., Miranda, B. B., Monteiro, V. E., Goncalves, C. G. V., Almeida, P. S., Oliveira, J. G., . . . de Santiago Ochoa, J. (2016). Development of an axial flux machine and control: simulation and experimental set up. In: 2016 12th IEEE/IAS International Conference On Industry Applications (INDUSCON): . Paper presented at 12th IEEE/IAS International Conference on Industry Applications (INDUSCON), NOV 20-23, 2016, Curitiba, BRAZIL.
Open this publication in new window or tab >>Development of an axial flux machine and control: simulation and experimental set up
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2016 (English)In: 2016 12th IEEE/IAS International Conference On Industry Applications (INDUSCON), 2016Conference paper, Published 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.

Keywords
Axial Flux Machine, Machine Design, Control Driver, Simulations, Experimental Set Up
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-346201 (URN)000408912200144 ()978-1-5090-5127-4 (ISBN)
Conference
12th IEEE/IAS International Conference on Industry Applications (INDUSCON), NOV 20-23, 2016, Curitiba, BRAZIL
Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-03-15Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5361-7739

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