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Negative correlation peak shaving control in a parking garage in Uppsala, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.ORCID iD: 0000-0002-1787-5669
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.ORCID iD: 0000-0001-7720-9062
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.ORCID iD: 0000-0003-4090-8622
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Electrical Engineering, Electricity.ORCID iD: 0009-0007-6241-8807
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2024 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 375, article id 124082Article in journal (Refereed) Published
Abstract [en]

As the global transition away from fossil fuels accelerates, energy systems across the globe face a significant challenge. Given the high energy consumption of electric vehicle chargers, effective control is imperative to prevent local grid overload and congestion. In Uppsala, Sweden, a newly built parking garage includes 30 electric vehicle chargers, 62 kW solar energy production, and a 60 kW/137 kWh battery energy storage system. This paper presents a control algorithm that uses a negative correlation scheme, adjusted to the local grid load, to effectively manage the battery energy storage. To improve the performance of the algorithm, a genetic optimization method is applied to find the best feasible daily load profile for the parking garage. The results indicate that peak load and energy consumption during grid high-load hours can be significantly reduced. This also results in an 9.5−12.8% reduction in electricity distribution fees at current prices as well as a peak load reduction of up to 50 %. Increasing the battery capacity and charging/discharging power in the scenarios analysed within the study will improve the algorithm’s ability to achieve a satisfactory negative correlation between the load demand of the facility and the local grid. The proposed control algorithm lowers the facility’s impact on the local grid during high-load peak hours by utilizing the battery energy storage system at the parking garage. Moreover, it decreases the distribution fees of the facility by lowering the load peaks and shifting the electricity consumption to the morning and night.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 375, article id 124082
Keywords [en]
Peak shaving, Negative correlation, Mobility house, Genetic algorithm, Dansmästaren
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-537029DOI: 10.1016/j.apenergy.2024.124082ISI: 001293475300001OAI: oai:DiVA.org:uu-537029DiVA, id: diva2:1892210
Funder
Swedish Energy Agency, 2019-03066Available from: 2024-08-26 Created: 2024-08-26 Last updated: 2025-09-19Bibliographically approved
In thesis
1. From Parking to Power: Integrating an Energy Management System in a Multifunctional Building to Enable E-mobility
Open this publication in new window or tab >>From Parking to Power: Integrating an Energy Management System in a Multifunctional Building to Enable E-mobility
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

E-mobility is pivotal in enabling sustainable and technologically advanced urban environments. In line with this, Sweden's electric vehicle fleet is rapidly expanding, thereby increasing the power necessary for charging electric vehicles. If not properly managed and controlled, this increase in power can potentially threaten grid stability and exacerbate grid congestion. 

The primary aim of this thesis was to assess and investigate the potential of a next-generation parking facility at a multifunctional building to be an active part of the city’s distribution grid. The research was guided by the question of to what capacity smart control of a parking facility with a technical system could assist and alter the load demand to generate benefits for both the building and the city’s distribution grid.

This was investigated at Dansmästaren, the first multifunctional building in Uppsala, Sweden. An experimental setup with an electric vehicle charging station and an energy management system was developed at the Ångström laboratory to test and verify control strategies before their implementation at the multifunctional building's parking facility. Thereafter, a second energy management system was developed and implemented at Dansmästaren with the purpose of monitoring and controlling the electric vehicle charging at the parking facility.

The findings of the included papers were divided into two categories. The charging of the electric vehicles can either be assisted by the parking facility's technical system or altered by including the electric vehicle charging in the control for the technical system. Both categories show that a parking facility with a technical system in a multifunctional building can help reduce local grid demand while also providing local benefits for the building.

While the contribution of a single multifunctional building may appear negligible from a grid perspective, the cumulative effect becomes substantial when applied across multiple buildings. Thus, the parking facility at Dansmästaren has the potential to play an active role in the city’s distribution grid through smart charging and the utilization of an energy management system.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2024. p. 82
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2449
Keywords
Peak shaving, Negative correlation, Mobility house, Genetic algorithm, Dansmästaren, Multifunctional building, E-mobility
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-538089 (URN)978-91-513-2229-2 (ISBN)
Public defence
2024-11-01, 101121, Sonja Lyttkens, Ångström, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2024-10-08 Created: 2024-09-12 Last updated: 2024-10-08
2. Watts up? Methods and perspectives on electricity consumption for energy transition
Open this publication in new window or tab >>Watts up? Methods and perspectives on electricity consumption for energy transition
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The ongoing transition to a net-zero emissions energy system is driven by what can be called a fourth wave of electrification, where fossil fuel-dependent processes are increasingly replaced by electric-powered appliances. At the same time, a substantial rise in electricity production is coming from renewable energy sources. Both developments are critical for a successful energy transition over the coming decades. A key aspect of this transition is understanding the load demand of electricity users.

The aim of this thesis is to analyze and assess the impact of different electricity users on the local grid, focusing on their consumption behavior. Conducted in collaboration with Uppsala Municipality, the research emphasizes a public perspective, user-friendliness, and a technologically-agnostic presentation of results. Three research objectives have been pursued throughout the thesis: (1) analyzing the impact of a single user's behavior in detail on the grid, incorporating peak shaving and distributed energy resources, in addition to a broader analysis to assess multiple users through a peak load correlation analysis; (2) proposing a framework to generate typical load profiles for various users, using time series clustering and a qualitative clustering step to model their demand patterns throughout the year; and (3) designing an index to quantify and compare the flexibility potential of electricity users, based on a rankable index developed using limited information.        

The results reveal considerable variation among users in both peak load contributions and flexibility potential. The peak load analysis and the flexibility index both identify users that could benefit from behavioral changes or offer potentially valuable flexibility to support grid stability. To test the framework of generating typical load profiles, a case study of elementary schools in Uppsala Municipality was conducted that showed that these institutions exhibited similar load patterns. The most typical load profile was rescaled to represent load variability based on the heated indoor area of an arbitrary school, showing a reasonable accuracy. These profiles can inform the selection of distributed energy resources, such as photovoltaic systems, or facilitate the co-location of users with complementary consumption patterns to minimize grid impacts.

The methods, tools, and frameworks presented in this thesis are versatile and can serve as valuable inputs for strategic decision-making by municipalities, businesses, and other stakeholders. By providing insights into user behavior, these tools can guide focused interventions to support the continued evolution of the energy transition.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2025. p. 95
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2527
Keywords
electricity consumption analysis, grid peak loads, distributed energy resources, peak shaving, time series correlation, time series clustering, flexibility
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-553615 (URN)978-91-513-2455-5 (ISBN)
Public defence
2025-05-21, Eva von Bahr, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2025-04-25 Created: 2025-03-30 Last updated: 2025-04-25
3. Charge Smarter, Not Harder: Electric Vehicles Smart Charging Strategies in a Multifunctional Building
Open this publication in new window or tab >>Charge Smarter, Not Harder: Electric Vehicles Smart Charging Strategies in a Multifunctional Building
2025 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Efficient use of existing resources can be achieved by integrating electric vehicle (EV) charging into the energy systems of buildings. Additionally distributed energy resources (DERs), such as EVs, contribute to the decarbonization of both the power generation and transportation sectors. Multifunctional buildings—integrating residential, commercial, and service functions within a single facility—enhance energy efficiency and flexibility by redistributing consumption over time, particularly during peak hours. To realize these benefits, residential and public charging infrastructure should adopt smart EV charging and provide flexibility services that reduce energy consumption while contributing both economically and environmentally. 

The aim of this thesis is to explore how increased demand flexibility at the user level, enabled by smart charging, can create value for different stakeholders. It examines both the technical possibilities and the challenges of smart charging through a combination of simulations and real-world experiments. The research is guided by two central questions: (i) What are the technical opportunities for smart charging strategies when considering different stakeholders and real-world analyses? (ii) What benefits and challenges arise from implementing unidirectional (V1G) and bidirectional (V2G) charging strategies and flexibility services? 

These questions were primarily investigated using two testbeds: the multifunctional building Dansmästaren and the Research Twin charging station at the Ångström Laboratory in Uppsala, Sweden. The thesis presents simulation results and experimental studies that advance the understanding of V1G and V2G strategies under real-world conditions. 

The strategies developed in this work present technically feasible solutions that take different stakeholder perspectives into account. Experimental studies demonstrated economic benefits of V1G implementation from the perspective of parking facility owners. From the grid owner’s perspective, a predictive model was developed that delivered accurate results and has been integrated into the building’s Energy Management System (EMS). The user perspective was also included, providing valuable insights into EV owners’ concerns, availability, and acceptance of smart charging solutions. 

Overall, the results of this thesis show that the proposed framework, validated in real-world environments, is transferable to other facilities with similar energy system infrastructures. The long-term ambition is to scale these solutions to city-wide applications, thereby enabling large-scale deployment of smart charging strategies. 

Place, publisher, year, edition, pages
Uppsala: Department of Electrical Engineering, Uppsala University, 2025. p. 56
Keywords
Electric Vehicles, Smart Charging strategies, multifunctional buildings, Vehicle-One-Grid, Vehicle-to-Grid, Load Demand Prediction, Public Charging, Residential Charging
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-567599 (URN)
Presentation
2025-10-24, Lecture hall Å101121, Sonja Lyttkens., Ångstromlaboratoriet, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2025-10-17 Created: 2025-09-19 Last updated: 2025-10-27Bibliographically approved

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Wallberg, AlexanderCastellucci, ValeriaFlygare, CarlLind, EmilSchultz, EgilMartins Mattos, MarinaWaters, Rafael

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