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  • 1.
    Leijon, Jennifer
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Santos Döhler, Jéssica
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Hjalmarsson, Johannes
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Brandell, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Castellucci, Valeria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Boström, Cecilia
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Analysis of charging and discharging of electric vehicles2023Conference paper (Refereed)
    Abstract [en]

    With more electric vehicles introduced in society, there is a need for further implementation of charging infrastructure. Innovation in electromobility may result in new charging and discharging strategies, including novel concepts such as smart charging, vehicle-to-grid and vehicle-to-everything. Access to charging infrastructure and novel ideas on charging or discharging may contribute to driving the transition towards e-mobility. This article aims to provide an overview of vehicle charging and discharging innovations with a cable connection, including an example of a MATLAB/Simulink model of vehicle-to-grid dynamics.

  • 2.
    Hjalmarsson, Johannes
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Energy Storage Systems in Electrical Distribution Grids: Analysis and implementations of use cases for service stacking2023Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This Ph.D. thesis investigates the possibility of using energy storage systems for multiple services by implementing service stacking, with special emphasis on congestion management in distribution grids. The shift towards increased shares of RES in combination with the ongoing electrification of society will create challenges in all parts of the power system. To ensure enough flexibility throughout the power system, energy storage should be part of the discussion as a crucial tool to support balancing and stability, but also to assist in or solve local and regional challenges. One important step in the development of energy storage integration is the forming of more complex business models where multiple services are provided using the same storage unit and is known as service stacking. This increases the availability of the storage capacity towards the power system where value could be generated on both local, regional and system levels. Although, one of the main barriers of energy storage investments have been the high investment and operational costs. By implementing service stacking, the chance of creating a lucrative business case increases and should be considered in all contexts of energy storage implementations.

    The targeted research questions focus on mapping the current state of service stacking implementations globally, comparing different methods for implementing scheduling optimization tools, and evaluation of the technical and economic performance for different service portfolios. According to the trends in the results of the appended papers, energy storage systems have the potential to stack services both as large-scale centralized units as well as small-scale distributed units and can be applied to all storage technologies. The higher degree of utilization of the storage units will result in increased degradation due to cycle aging, but the magnitude of this increase strongly depends on the service portfolio composition and allowed cycle intensity. Future work could focus on multi-objective optimization, extended service portfolios, and scheduling over several time scales to include seasonal storage and intraday trading.

    List of papers
    1. Service stacking using energy storage systems for grid applications: A review
    Open this publication in new window or tab >>Service stacking using energy storage systems for grid applications: A review
    2023 (English)In: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538, Vol. 60, article id 106639Article, review/survey (Refereed) Published
    Abstract [en]

    Energy storage solutions for grid applications are becoming more common among grid owners, system operators and end-users. Storage systems are enablers of several possibilities and may provide efficient solutions to e.g., energy balancing, ancillary services as well as deferral of infrastructure investments. To ensure that an energy storage investment is guaranteed a reasonable payback period and a good return of investment it is advantageous to consider the possibility of service stacking. By offering additional services in turns or in parallel with the main service it is possible to create important revenue streams. The aim of this review is to provide an up-to-date status of service stacking using grid connected energy storage systems by presenting current research and on-the-table ideas. Results from the review show that frequency regulation services are the most common services to offer together with energy arbitrage and integration of renewable energy sources. The results also show that it is strategically favorable to offer additional services for storage units which are used seasonally or with low frequency. It can be concluded that service stacking is a promising method to implement for storage operators to increase the degree of utilization of storage units. It may also be concluded that the increased need for ancillary services increases the opportunity for storage units to participate in markets for energy and ancillary services. Future studies could focus on the correlation between service stacking possibilities and actual placement of the storage, and how hybrid storage configurations would affect the potential of service stacking.

    Place, publisher, year, edition, pages
    Elsevier, 2023
    Keywords
    Energy storage, Grid applications, Revenue stacking, Service stacking
    National Category
    Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems Energy Engineering
    Research subject
    Electrical Engineering with specialization in Systems Analysis
    Identifiers
    urn:nbn:se:uu:diva-496296 (URN)10.1016/j.est.2023.106639 (DOI)000923566100001 ()
    Funder
    SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS3Swedish Energy AgencyVattenfall AB
    Available from: 2023-02-09 Created: 2023-02-09 Last updated: 2023-10-02Bibliographically approved
    2. Large scale energy storage in Uppsala, Sweden: an analysis of voltage fluctuations and a service stacked portfolio
    Open this publication in new window or tab >>Large scale energy storage in Uppsala, Sweden: an analysis of voltage fluctuations and a service stacked portfolio
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    2022 (English)In: Proceedings of the international conference on evolving cities / [ed] Prof. AbuBakr S. Bahaj, 2022, p. 57-62Conference paper, Published paper (Refereed)
    Abstract [en]

    Extensive electrification has created an increased demand of electric energy and power. Congestion issues are expected to become more common as transmission and distribution grids reach their capacity limits. One of the regions in Sweden that has experienced this already is Uppsala. The distribution system operator, Vattenfall Distribution has initiated an R&D project that connects a 5 MW/20 MWh Li-ion battery energy storage system to temporarily ease the grid congestion. This study covers an analysis of grid voltage fluctuations using a large-scale battery in a distribution grid. The power quality is examined at the 10 kV connection point of the storage, where voltage and power flow are presented. Also, an example of how value stacking may be implemented is illustrated by adding a secondary service during the year. The test results indicate no significant distortion of the voltage level at the measurement point during smooth ramping. It can be concluded that smooth ramping of the BESS has very low or no impact on the local power quality, and additional services should be provided during the year to create several revenue streams. Future studies could focus on fast ramping of the BESS and stacking services in an intra-season perspective. 

    Keywords
    Distribution grid, Energy storage, Power quality, Grid congestion, Service stacking, Voltage fluctuations
    National Category
    Energy Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
    Research subject
    Electrical Engineering with specialization in Systems Analysis
    Identifiers
    urn:nbn:se:uu:diva-496298 (URN)10.55066/proc-icec.2021.18 (DOI)
    Conference
    International Conference on Evolving Cities (ICEC), Southampton, UK and Online, 22-24 September, 2021
    Funder
    SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS3Swedish Energy AgencyVattenfall AB
    Available from: 2023-02-09 Created: 2023-02-09 Last updated: 2023-10-02Bibliographically approved
    3. Optimal scheduling of energy storage system in distribution grids using service stacking
    Open this publication in new window or tab >>Optimal scheduling of energy storage system in distribution grids using service stacking
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    2023 (English)In: 27th International Conference on Electricity Distribution (CIRED 2023), Institution of Engineering and Technology, 2023, p. 3077-3081Conference paper, Published paper (Refereed)
    Abstract [en]

    Energy storage systems are widely used for power system applications. By implementing service stacking, enhanced performance of storage systems can potentially be obtained. A scheduling tool based on linear programming was implemented to schedule a grid connected energy storage for two portfolios in separate periods. The results show that it is possible to provide additional services which generate value to the power system. By implementing a capacity loss life model the increased cycle aging is estimated. 

    Place, publisher, year, edition, pages
    Institution of Engineering and Technology, 2023
    Keywords
    linear programming, ageing, power grids, scheduling, investment
    National Category
    Energy Systems Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-512968 (URN)10.1049/icp.2023.0907 (DOI)978-1-83953-855-1 (ISBN)
    Conference
    27th International Conference & Exhibition on Electricity Distribution (CIRED), Rome, Italy, 12-15 June, 2023
    Funder
    SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS3Swedish Energy AgencyVattenfall AB
    Available from: 2023-10-02 Created: 2023-10-02 Last updated: 2023-10-02Bibliographically approved
    4. Enhancing the value of large-scale energy storage systems in congested distribution grids using service stacking
    Open this publication in new window or tab >>Enhancing the value of large-scale energy storage systems in congested distribution grids using service stacking
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    2023 (English)In: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538Article in journal (Other academic) Submitted
    Abstract [en]

    Energy storage systems (ESS) are suitable for many grid applications, where some have large seasonal variations. By combining additional services, i.e., service stacking, companies with energy storage assets may generate additional revenue as well as provide services to the power system. This paper aims to highlight and estimate the technical and economic potential of stacking services using energy storage systems in congested a distribution grid. A scheduling optimization tool was implemented for a large-scale battery ESS providing a selection of deemed relevant services over two years. The results show that there is a great potential to enhance the value of the ESS significantly depending on the service portfolio layout. A capacity life loss model was also implemented to analyse the degradation of the ESS, and the cycle aging was estimated for the chosen portfolios. The results showed that a fully stacked portfolio does not necessarily result in increased cycle aging, but that it depended on the services in the portfolio. The cycle aging was affected the most by stacking flexibility with energy arbitrage, while frequency regulation services only resulted in a few additional cycles during each year of operation. 

    Keywords
    Ancillary services, Degradation, Energy storage system, Optimization, Service stacking
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
    Identifiers
    urn:nbn:se:uu:diva-512961 (URN)
    Funder
    SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS3
    Available from: 2023-10-02 Created: 2023-10-02 Last updated: 2023-10-02
    5. Scheduling optimization of stacked grid services using energy storage system at large sport facilities in a congested distribution grid
    Open this publication in new window or tab >>Scheduling optimization of stacked grid services using energy storage system at large sport facilities in a congested distribution grid
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    2023 (English)In: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538Article in journal (Refereed) Submitted
    Abstract [en]

    Congestion management in distribution grids is a growing challenge for network operators due to a combination of fast growing cities and electrification of transport and industry sectors. Energy storage systems connected downstream of bottlenecks have the potential to relieve parts of the peak demand, and typically does not motivate investments financially as a third-party actor alone. By stacking services it is possible for storage units to become financially viable while also enabling opportunities for providing additional local services and participation in markets for ancillary services. In this study, a large customer connected to the congested distribution grid in Uppsala, Sweden, was considered and the systematic potential of a battery connected to the facility was evaluated. A set of portfolios including the services tariff optimization, flexibility-as-a-service, and frequency containment reserve was evaluated by finding the optimal scheduling strategy using a metaheuristic optimization approach together with a capacity loss life model. The analysis was done for two separate years to illustrate the impact of yearly market fluctuations on the service allocation. Additionally, a sensitivity analysis was also performed for the rated energy capacity of the battery. The simulation results indicate that stacking services yields the most valuable portfolio with respect to both technical and economic value where the battery managed to capture several revenue streams at the cost of a small increase in cycle aging, compared to when using the BESS for tariff optimization only. From a system perspective, stacking services enables the BESS to support the power system and the local distribution grid during a large majority of the year. 

    Keywords
    Battery, Energy storage system, Grid congestion, Peak shaving, Optimization
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
    Identifiers
    urn:nbn:se:uu:diva-512964 (URN)
    Funder
    SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS3
    Available from: 2023-10-02 Created: 2023-10-02 Last updated: 2023-10-02
    6. Evaluation of centralized and distributed energy storage systems in congested distribution grids with service stacked portfolios
    Open this publication in new window or tab >>Evaluation of centralized and distributed energy storage systems in congested distribution grids with service stacked portfolios
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    2023 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118Article in journal (Refereed) Submitted
    Abstract [en]

    The clean energy transition is expected to continue at a fast pace in the upcoming years and will imply connection of large amounts of distributed energy resources to existing distribution grids. These have the opportunity to support the power system both locally but also regionally and possibly on a system level too, which could be achieved by bundling services i.e., service stacking. The aim of this article is to compare effects on distribution grids when implementing service stacked portfolios for centralized and distributed storage capacities in congested distribution grids. The complex nature of the scheduling optimization problem motivated using a non-linear solver and for this study a meta-heuristic approach was chosen. A large number of energy storage units were connected to the IEEE European Low Voltage test feeder and load flow calculations were executed using the open-source distribution grid simulator OpenDSS. The results indicate that service stacking could be implemented successfully for both centralized and distributed storage capacities, but the possibility to target local and regional power quality measures varies for the two cases. Finally, multi-service provision using energy storage systems should be considered in more extensive simulation and real-world studies to fully capture the effects on grid dynamics and scheduling possibilities. 

    Keywords
    Ancillary services, Congested grids, Distribution grids, Energy storage, Service stacking, Storage placement
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
    Identifiers
    urn:nbn:se:uu:diva-512965 (URN)
    Funder
    SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS3
    Available from: 2023-10-02 Created: 2023-10-02 Last updated: 2023-10-02Bibliographically approved
    7. The potential impact of a mobility house on a congested distribution grid – a case study in Uppsala, Sweden
    Open this publication in new window or tab >>The potential impact of a mobility house on a congested distribution grid – a case study in Uppsala, Sweden
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    2022 (English)In: CIRED Porto Workshop 2022: E-mobility and power distribution systems, London: IEEE, 2022, article id 1442Conference paper, Published paper (Refereed)
    Abstract [en]

    The distribution grid in Uppsala, Sweden, has during the last years experienced an increasing number of hours with congestion, and as the city and number of EVs are growing new solutions are needed to not worsen this problem. Uppsala Municipality is planning a series of so-called “mobility houses” which will act as a hub for transportation while, at the same time, supporting the transition to a fossil-free energy system. Dansmästaren – the first mobility house in Uppsala – was built in 2020 and this paper describes its parking garage's main energy system parts, giving a brief introduction and analysis of each and their potential effect on Dansmästaren's grid impact. Dansmästaren has the potential to control its load on the grid, but it is essential to collect more data and analyze when flexibility is of most importance. Future studies suggest analyzing Dansmästaren's systems in more detail and developing a more advanced energy management system.

    Place, publisher, year, edition, pages
    London: IEEE, 2022
    Keywords
    advanced energy management system, mobility house, congested distribution grid, Sweden, Uppsala Municipality, fossil-free energy system, parking garage, Dansmästaren's grid impact
    National Category
    Other Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-483806 (URN)10.1049/icp.2022.0880 (DOI)
    Conference
    CIRED workshop on E-mobility and power distribution systems, 02-03 June 2022, Hybrid Conference, Porto, Portugal
    Available from: 2022-09-02 Created: 2022-09-02 Last updated: 2023-10-02Bibliographically approved
    8. Analysis of charging and discharging of electric vehicles
    Open this publication in new window or tab >>Analysis of charging and discharging of electric vehicles
    Show others...
    2023 (English)Conference paper, Published paper (Refereed)
    Abstract [en]

    With more electric vehicles introduced in society, there is a need for further implementation of charging infrastructure. Innovation in electromobility may result in new charging and discharging strategies, including novel concepts such as smart charging, vehicle-to-grid and vehicle-to-everything. Access to charging infrastructure and novel ideas on charging or discharging may contribute to driving the transition towards e-mobility. This article aims to provide an overview of vehicle charging and discharging innovations with a cable connection, including an example of a MATLAB/Simulink model of vehicle-to-grid dynamics.

    Keywords
    battery ageing, charging, simulation, smart charging, V2G (vehicle to grid)
    National Category
    Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-508790 (URN)
    Conference
    36th International Electric Vehicle Symposium and Exhibition (EVS36)Sacramento, California, USA, June 11-14, 2023
    Funder
    Swedish Energy AgencySweGRIDS - Swedish Centre for Smart Grids and Energy StorageStandUp
    Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2023-12-05
    9. Grid Impact and Power quality Assessment in wave Energy Parks: Different layouts and Power Penetrations using Energy Storage
    Open this publication in new window or tab >>Grid Impact and Power quality Assessment in wave Energy Parks: Different layouts and Power Penetrations using Energy Storage
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    2021 (English)In: The Journal of Engineering, ISSN 1872-3284, E-ISSN 2051-3305, Vol. 2021, no 8, p. 415-428Article in journal (Refereed) Published
    Abstract [en]

    Power fluctuations induced by wave energy converters (WECs) may reflect negative impact on the power quality of the power grid. Assessing their impact is an important step to ensure the grid compliance level of the energy park. The IEC 61000-4-15 standard classifies the allowable disturbances in the grid. This study analysed and assessed the grid impact in terms of flicker, harmonic distortion and voltage variations. The assessments were performed without energy storage and compared when using the energy storage. A single WEC is emulated as an irregular power output of a real WEC using a combined model of power take-off in the Simulink model. Time series based on data obtained in earlier offshore experiments, conducted at the Lysekil research site in Sweden, is used to emulate a wave energy park (WEP) power in a land-based test rig in real-time power hardware-in-the-loop simulations. A total of three and ten WECs are emulated by introducing a time delay in the time series to investigate the grid impact in each layout. Flicker emissions, voltage variations, individual and total harmonics of the voltage at the connection point in each layout are studied and compared with the limits to be grid compliant for layouts of the WEP. In addition, voltage and current harmonics for the single WEC and individual harmonics in each phase of the voltage are measured and analysed to assess the compliance level of the WEP.

    Place, publisher, year, edition, pages
    Institution of Engineering and TechnologyInstitution of Engineering and Technology (IET), 2021
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-390136 (URN)10.1049/tje2.12006 (DOI)000670344800001 ()
    Funder
    Swedish Research Council, 2015-03126StandUp
    Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2024-01-15Bibliographically approved
    10. Power Hardware-in-the-loop simulations of Grid-Integration of a Wave Power Park
    Open this publication in new window or tab >>Power Hardware-in-the-loop simulations of Grid-Integration of a Wave Power Park
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    2019 (English)In: 13th European Wave and Tidal Energy Conference (EWTEC), Napoli, Italy, September 1-6, 2019, Napoli, Italy, 2019Conference paper, Published paper (Refereed)
    Place, publisher, year, edition, pages
    Napoli, Italy: , 2019
    Keywords
    energy storage system, grid integration, hardware-in-the-loop, microgrid, power fluctuations, wave energy converter
    National Category
    Other Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-390104 (URN)
    Conference
    13th European Wave and Tidal Energy Conference (EWTEC), Napoli, Italy, September 1-6, 2019
    Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2023-10-02Bibliographically approved
    11. Power Hardware in-the-Loop Real Time Modelling using Hydrodynamic Model of a Wave Energy Converter with Linear generator Power Take-Off
    Open this publication in new window or tab >>Power Hardware in-the-Loop Real Time Modelling using Hydrodynamic Model of a Wave Energy Converter with Linear generator Power Take-Off
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    2019 (English)In: the 29th International Ocean and Polar Engineering Conference (ISOPE), Honolulu, Hawaii, USA, June 16-21, 2019, 2019Conference paper, Oral presentation with published abstract (Refereed)
    National Category
    Marine Engineering
    Identifiers
    urn:nbn:se:uu:diva-390101 (URN)
    Conference
    The 29th International Ocean and Polar Engineering Conference (ISOPE), Honolulu, Hawaii, USA, June 16-21, 2019
    Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2023-10-02Bibliographically approved
    12. Virtual Synchronous Generator Based Current Synchronous Detection Scheme for a Virtual Inertia Emulation in SmartGrids
    Open this publication in new window or tab >>Virtual Synchronous Generator Based Current Synchronous Detection Scheme for a Virtual Inertia Emulation in SmartGrids
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    2019 (English)In: Energy and Power Engineering, ISSN 1949-243X, E-ISSN 1947-3818, Vol. 11, no 3, p. 99-131Article in journal (Refereed) Published
    Abstract [en]

    Renewable energy sources, such as photovoltaicwind turbines, and wave power converters, use power converters to connect to the grid which causes a loss in rotational inertia. The attempt to meet the increasing energy demand means that the interest for the integration of renewable energy sources in the existing power system is growing, but such integration poses challenges to the operating stability. Power converters play a major role in the evolution of power system towards SmartGrids, by regulating as virtual synchronous ge-nerators. The concept of virtual synchronous generators requires an energy storage system with power converters to emulate virtual inertia similar to the dynamics of traditional synchronous generators. In this paper, a dynamic droop control for the estimation of fundamental reference sources is imple-mented in the control loop of the converter, including active and reactive power components acting as a mechanical input to the virtual synchronous generator and the virtual excitation controller. An inertia coefficient and a droop coefficient are implemented in the control loop. The proposed con-troller uses a current synchronous detection scheme to emulate a virtual iner-tia from the virtual synchronous generators. In this study, a wave energy converter as the power source is used and a power management of virtual synchronous generators to control the frequency deviation and the terminal voltage is implemented. The dynamic control scheme based on a current synchronous detection scheme is presented in detail with a power manage-ment control. Finally, we carried out numerical simulations and verified the scheme through the experimental results in a microgrid structure.

    Place, publisher, year, edition, pages
    Scientific Research Publishing, 2019
    Keywords
    Dynamic Droop Control, Energy Storage, Virtual Inertia, Virtual Synchronous Generator
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering
    Research subject
    Engineering Science with specialization in Science of Electricity
    Identifiers
    urn:nbn:se:uu:diva-379215 (URN)10.4236/epe.2019.113007 (DOI)
    Funder
    Swedish Research Council, 2015-03126StandUp
    Available from: 2019-03-13 Created: 2019-03-13 Last updated: 2023-10-02Bibliographically approved
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  • 3.
    Hjalmarsson, Johannes
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Flygare, Carl
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.
    Wallberg, Alexander