The Fraunhofer Institute for Solar Energy Systems (ISE) specializes in research for the energy transition, focusing on various areas including photovoltaics, energy-efficient buildings, and hydrogen technologies. The institute employs approximately 1,400 people with a 2021 budget of €116.7 million, and utilizes advanced modeling approaches to optimize energy systems and sector coupling in Germany. Upcoming developments include a multi-node regional simulation model to enhance energy exchange between regions as part of their ongoing research and modeling efforts.

1. Welcome at Fraunhofer ISE
—
Christoph Kost and Patrick Jürgens
ETSAP Workshop
Freiburg, 23rd May 2022
www.ise.fraunhofer.de

2. FHG-SK: ISE-INTERNAL
The Institute in Numbers
—
Institute Directors:
Prof. Dr. Hans-Martin Henning
Prof. Dr. Andreas Bett
Employees: ca. 1400
Budget 2021:
Operation €104.4 million
Investment €12.3 million
Total €116.7 million
Founded in 1981
Fraunhofer Institute for Solar Energy Systems ISE
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Performing research for the energy transition for over forty years

3. FHG-SK: ISE-INTERNAL
Our Business Areas
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Photovoltaics Energy Efficient Buildings Solar Thermal Power
Plants and Industrial
Processes
Hydrogen Technologies
and Electrical Energy
Storage
Power Electronics, Grids
and Smart Systems
Fotos:
©
Fraunhofer
ISE

4. FHG-SK: ISE-INTERNAL
Reserach Group Energy Systems and Energy Economics
Head of Group: Dr. Christoph Kost
Planning and Operating
Strategies
of Power Plants
Energy Economics of
regional and (inter-) national
energy systems
Techno-Economic
Assessment of Energy
Technologies
Market Analysis and
Business Models
Photos
©
Fraunhofer
ISE
Transformation and decarbonization analyses
Sector coupling issues
▪ Processes, buildings (e.g. WP), traffic (e.g. electromobility)
▪ Multiple technologies are optimized separately
▪ Detailed integration of sector coupling effects
Coupled expansion planning for infrastructure measures in GER/EU systems,
▪ storage, power plants (aggregation of data from EE)
▪ Gas grids, electricity grids, hydrogen
Market integration and system
▪ optimization of local/decentralized energy systems, properties and districts

5. FHG-SK: ISE-INTERNAL
Power System Model
(National Level)
ENTIGRIS
Investment Decision
Model
(National Level)
E2S
Energy System
Model
(National Level)
REMod
Energy System model
& Market Integration
(Regional/Unit Level)
DISTRICT
Energy and City
Model (Municipal/City
Level)
KomMod
Model based Energy System Analysis by Fraunhofer ISE
Models for our services
Grid Models
Load Flow Analysis
Distribution Grid
Planning
Power System
Operation Control

6. Regionalization of the
integrated sector coupled
energy system model REMod
—
Patrick Jürgens
ETSAP Workshop
Freiburg, 23rd May 2022
www.ise.fraunhofer.de

7. FHG-SK: ISE-INTERNAL
Regionalization of the integrated sector coupled energy system model REMod
09.06.2022 © Fraunhofer ISE
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Agenda
1. Sector coupling in the model REMod
2. Optimization Results
3. Regionalization: Energy Exchange Function
4. Outlook: REMod-EU

8. FHG-SK: ISE-INTERNAL
Sector coupling in the model REMod
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Modeling approach and scope
Geographical scope
▪ Germany as one node
Conversion and consumption sectors
▪ Inclusion of all consumption sectors
▪ Multiple technologies are optimized separately
▪ Detailed integration of sector coupling effects
Optimization
▪ Minimization of transformation costs
▪ Non-linear „Black box“ optimization of realistic simulation
Time resolution
▪ Simulation on hourly basis
▪ Including historic timeseries (demand, weather) of five years
▪ Optimization of transformation on yearly basis
©
Markus
Jürgens
© Fraunhofer ISE

9. FHG-SK: ISE-INTERNAL
Optimization Results
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Transformation path of technologies – renewable energy sources
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Markus
Jürgens
© Fraunhofer ISE

10. FHG-SK: ISE-INTERNAL
Optimization Results
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Transformation path of technologies – industry sector
©
Markus
Jürgens
© Fraunhofer ISE

11. FHG-SK: ISE-INTERNAL
Optimization Results
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Transformation path of technologies – buildings sector
©
Markus
Jürgens
© Fraunhofer ISE

12. FHG-SK: ISE-INTERNAL
Optimization Results
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Transformation path of technologies – transportation sector
©
Markus
Jürgens
© Fraunhofer ISE

13. FHG-SK: ISE-INTERNAL
First energy system model for all sectors on state level
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Current Model
▪ Germany as one node
▪ Assumption: energy is available at any place
Regionalized Model
▪ Multi-node: each region simulated separately
▪ Simulated energy-exchange between regions
▪ Optimization of electricity grid and gas network

14. FHG-SK: ISE-INTERNAL
Regionalization: Simulation with Energy Exchange Function
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©
Markus
Jürgens
© Fraunhofer ISE
Calculate residual load
Exchange between regions
(dis)charging of energy storage
Flexible power plants
Im/export and load balancing
Exchange between regions
Exchange between regions
balance
neighbouring region
balance
neighbouring region

15. FHG-SK: ISE-INTERNAL
Outlook: REMod-EU
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Modeling approach and scope
Data
▪ Development of database
▪ Coupling to models: renewables.ninja, GlobalEnergyGIS.jl, ...
▪ Coupling of public Databases: Energy-Charts, Entso-E, Eurostat, ...
Optimization and Calculation Effort
▪ Parallelization
▪ Adjust optimization algorithm
▪ Flexible reduction of optimization variables
Scenario Analysis
▪ European Green Deal & Effort Sharing
▪ Network Expansion (Electricity, Gas, H2)
▪ Role of Technologies (e.g. Nuclear, Gas)
©
Markus
Jürgens
© Fraunhofer ISE

16. Thank You for Your Attention!
—
Dr. Christoph Kost, Patrick Jürgens
Energy Systems and Energy Economics
Tel. +49 761/4588-5750
christoph.kost@ise.fraunhofer.de
patrick.juergens@ise.fraunhofer.de

17. Thank You for Your Attention!
—
Dr. Christoph Kost, Patrick Jürgens
Energy Systems and Energy Economics
Tel. +49 761/4588-5750
christoph.kost@ise.fraunhofer.de
patrick.juergens@ise.fraunhofer.de
Fraunhofer ISE
Heidenhofstraße 2
79110 Freiburg
www.ise.fraunhofer.de