FLEXGRID: A novel smart grid architecture that facilitates high RES penetration through innovative markets towards efficient interaction between advanced electricity grid management and intelligent stakeholders

By overcoming the conflicting interests of various energy market stakeholders and finding optimal equilibrium points, one EU-funded project is helping advance the transition towards renewable energy systems.

In accordance with the European Green Deal, the EU is working towards reducing carbon emissions and becoming the world’s first carbon-neutral continent by 2050. At the same time, in reaction to Russia’s unprovoked invasion of Ukraine, the EU is also looking to reduce its dependence on foreign energy.

The answer to both goals is renewable energy sources and energy flexibility.

Unfortunately, making the switch to renewable energy involves much more than plugging in the grid and flipping a switch.

"Introducing new services capable of supporting a high share of renewable energy requires that future smart grids are able to facilitate an effective interaction between energy markets and grid management systems," says Manos Varvarigos, a professor at the National Technical University of Athens.

Bridging this gap between reliable grid operation, energy flexibility and market efficiency is the main goal of the EU-funded FLEXGRID project.

It starts with energy flexibility

FLEXGRID is all about energy flexibility. “The idea is simple – to build an online marketplace where flexibility buyers can easily purchase services from flexibility suppliers,” explains Varvarigos, who coordinated the project.

According to Varvarigos, what the project calls FlexBuyers includes distribution system operators (DSOs), who use flexibility to deal with local network problems. It also includes transmission system operators (TSOs), who procure ancillary services from flexible assets at the distribution level, along with balance responsible parties (BRPs) looking to balance their portfolios.

On the other side of the FLEXGRID equation are FlexSuppliers. This group includes energy retailers that leverage flexibility from end-consumer assets, renewable energy suppliers who operate storage and dispatchable units, and independent aggregator companies that have contracts with a portfolio of energy prosumers and electric vehicles.

An online flexibility marketplace

Between these two groups is the FLEXGRID Automated Trading Platform (ATP), an online flexibility marketplace where FlexBuyers can easily buy services from FlexSuppliers.

The marketplace is comprised of several innovative digital tools, each of which targets the real-life business needs of a specific energy player. For example, a flexibility market operator can use the Flexibility Market Clearing Toolkit to clear the local flexibility market by taking into consideration distribution-network constraints, while a DSO can use this same tool to identify flexibility needs and thus avoid local congestion and voltage control problems.

The marketplace also includes toolkits designed for FlexSuppliers and for independent aggregators.

"On the demand side, FlexBuyers can use these tools to automatically formulate flexibility requests, while on the supply side, FlexSuppliers can automatically formulate flexibility offers," remarks Varvarigos.

"Both sides of the market can then submit their bids to the FLEXGRID ATP, which automatically finds the optimal flexibility demand and supply matches."

Advancing the transition towards renewable energy

Thanks to its use of advanced mathematical models and complex algorithms, the FLEXGRID project succeeded at closing the gap between reliable grid operation and energy flexibility market efficiency.

"By bridging the conflicting interests of various energy market stakeholders and finding optimal equilibrium points, FLEXGRID has advanced the transition towards renewable energy," concludes Varvarigos..

"In doing so, not only are we helping Europe reduce its carbon footprint, but we’re also reducing energy costs for European citizens."

FLEXGRID’s solutions also have the potential to provide policymakers with the scientific and technical information they need to make informed energy decisions. As such, researchers are now working to test the project’s solutions via pilot demonstrators in several EU Member States.



Publications : 2020-2021

Journal Articles

  1. G. Tsaousoglou, I. Sartzetakis, P. Makris, N. Efthymiopoulos, E. Varvarigos, and N. G. Paterakis, "Flexibility Aggregation of Temporally Coupled Resources in Real-Time Balancing Markets Using Machine Learning", IEEE Transactions on Industrial Informatics, 18(7), 4342-4351, doi: 10.1109/TII.2021.3132036.
  2. N. Efthymiopoulos, P. Makris, G. Tsaousoglou, K. Steriotis, V. Lacort, R. Gehrcke, M. Bagherpourba, G. Milzer, B. Pellerin, F. Farrukh, M. Thoma, T. Tadin, M. I. Baka, C. Papadimitriou, A. Kyprianou, G. Georghiou, H. Pandzic, D. Badanjak, S. Chatzivasileiadis, E. M. Prat, M. Calin, T. Esterl, E. Varvarigos, "FLEXGRID - A novel smart grid architecture that facilitates high RES penetration through innovative markets towards efficient interaction between advanced electricity grid management and intelligent stakeholders", Open Research Europe Journal, October 2021
  3. A. Valkanis, G. Papadimitriou, G. Beletsioti, E. Varvarigos, and P. Nicopolitidis "Efficiency and Fairness Improvement for Elastic Optical Networks using Reinforcement Learning-based Traffic Prediction", in IEEE/OSA Journal of Optical Communications and Networking (JOCN), vol. 14, no. 3, pp. 25-42, March 2022, doi: 10.1364/JOCN.440590
  4. K. Steriotis, K. Šepetanc, H. Pandžić, P. Makris, N. Efthymiopoulos, K. Sboukis, E. Varvarigos, "Stacked Revenues Maximization of Distributed Battery Storage Units via Emerging Flexibility Markets", IEEE Transactions on Sustainable Energy, Vol. 13(1), pp. 464-478, Oct. 2021.
  5. G. Tsaousoglou, P. Soumplis, N. Efthymiopoulos, K. Steriotis, A. Kretsis, P. Makris, P. Kokkinos, E. Varvarigos, "Demand Response as a Service: Clearing Multiple Distribution-Level Markets", IEEE Transactions on Cloud Computing (special issue), Oct. 2021.
  6. G. Tsaousoglou, K. Petsinis, P. Makris, I. Skoteinos, N. Efthymiopoulos, E. Varvarigos, A "Shortage Pricing Mechanism for Capacity Remuneration and Simulation of Its Hypothetical Implementation in the Greek Balancing Market", Utilities Policy, Elsevier, Vol. 71, Aug 2021.
  7. A. Khaksary, G. Tsaousoglou, P. Makris, K. Steriotis, N. Efthymiopoulos, E. Varvarigos, Sizing of Electric Vehicle Charging Stations with Smart Charging Capabilities and Quality of Service Requirements, Sustainable Cities and Society, Elsevier, July 2021, doi doi.org/10.1016/j.scs.2021.102872
  8. G. Tsaousoglou, K. Mitropoulou, , K. Steriotis, N. G. Paterakis, P. Pinson, E. Varvarigos, "Managing Distributed Flexibility under Uncertainty by Combining Deep Learning with Duality", IEEE Transactions on Sustainable Energy, Vol. 12(4), pp. 2195- 2204, June 2021
  9. A. Khaksary, G. Tsaousoglou, P. Makris, K. Steriotis, N. Efthymiopoulos, E. Varvarigos, Planning of Electric Vehicle Charging Stations with Smart Charging Capabilities and Quality of Service Requirements, Sustainable Cities and Society, Elsevier, doi.org/10.1016/j.scs.2021.102872.
  10. F. Karimi, D. Green, P. Matous, M. Varvarigos, K. R. Khalilpour, Network of Networks: A Bibliometric Analysis, Physica D: Nonlinear Phenomena, Elsevier, Vol. 421, pp. 1-11, July 2021. doi.org/10.1016/j.physd.2021.132889
  11. A. Kretsis, I. Sartzetakis, P. Soumplis, P. Kokkinos, P. Nikopolidis, G. Papadimitriou, E. Varvarigos, ARMONIA: A unified access and metro network architecture, MDPI, Applied Sciences (special issue), December 2020, 10(23), doi:10.3390/app10238318
  12. C. Kyriakopoulos, P. Nicopolitidis, G. Papadimitriou, E. Varvarigos, Exploiting IP-Layer Traffic Prediction Analytics to Allocate Spectrum Resources Using Swarm Intelligence, International Journal of Communication Systems, pp. e4516, July 2020.
  13. K. Tokas, G. Patronas, C. Spatharakis, P. Bakopoulos, A. Kyriakos, G. Landi, E. Zahavi, K. Christodoulopoulos, M. Aziz, R. Pitwon, D. Gallico, D. Reisis, E. Varvarigos, H. Avramopoulos, Photonic End-to-end real-time demonstration of the slotted, SDN-controlled NEPHELE optical datacenter network, Photonics open access journal, special issue on Optical Communication, Information Processing, and Data Storage, Vol. 7 (2), 44, June 2020.
  14. Smpoukis, K., Steriotis, K., Efthymiopoulos, N., Tsaousoglou, G., Makris, P. and Varvarigos, E.M., 2020. Network and Market-Aware Bidding to Maximize Local RES Usage and Minimize Cost in Energy Islands with Weak Grid Connections. Energies, 13(16), p.4043.
  15. K. Steriotis, K. Smpoukis, N. Efthymiopoulos, G. Tsaousoglou, P. Makris, E. Varvarigos, "Strategic and Network-Aware Bidding Policy for Electric Utilities through the Optimal Orchestration of a Virtual and Heterogeneous Flexibility Assets’ Portfolio", Electric Power Systems Research, Vol. 184, 2020.
  16. G. Tsaousoglou, K. Steriotis, N. Efthymiopoulos, P. Makris, E. Varvarigos, Truthful, Practical and Privacy-aware Demand Response in the Smart Grid via a Distributed and Optimal Mechanism, IEEE Transactions on Smart Grids, 2020.
  17. G. A Beletsioti, G. I Papadimitriou, P. Nicopolitidis, E. Varvarigos, S. Mavridopoulos, A Learning-Automata-based Congestion-aware scheme for Energy-Efficient Elastic Optical Networks, IEEE Access, 2020.
  18. S. Mavridopoulos, G. Beletsioti, P. Nicopolitidis, G. I. Papadimitriou, and E. Varvarigos, "Hop-Distance based Bandwidth Allocation Technique for Elastic Optical Networks", International Journal of Communication Systems, Vol.33, Issue 8, May 2020

 

Conference Proceedings

  1. K. Kontodimas, P. Soumplis, A. Kretsis, P. Kokkinos and E. Varvarigos, Secured Distributed Storage Resource Allocation on Cloud-Edge Infrastructures, in 10th IEEE International Conference on Cloud Networking (IEEE CloudNet 2021), Nov. 2021 (Best Paper Award)
  2. A. Mathioudaki, G. Tsaousoglou, E. Varvarigos, D. Fotakis, Efficient Online Scheduling of Electric Vehicle Charging Using a Service-Price Menu, 2021 International Conference on Smart Energy Systems and Technologies (SEST), Sept. 2021
  3. I. P. Chochliouros, A. Kostopoulos, M. Payaró, C. Verikoukis, S. De Capitani di Vimercati, E. Vinogradov, V. Ranjbar, J. Vardakas, M. A. Rahman, P. Soumplis, E. Varvarigos, Machine Learning-Based, Networking and Computing Infrastructure Resource Management, 2021 IFIP International Conference on Artificial Intelligence Applications and Innovations, pp. 85-94, June 2021.
  4. J. S Vardakas, K. Ramantas, M. Payaró, S. Pollin E. Vinogradov E. Varvarigos, P. Kokkinos, R. Gonzalez, J. J. Vegas Olmos I. Chochliouros P. Chanclou P. Samarati A. Flizikowski, M. A. Rahman, C. Verikoukis, 'Towards Machine-Learning-Based 5G and Beyond Intelligent Networks: The MARSAL Project Vision', 2021 IEEE International Mediterranean Conference on Communications and Networking (MeditCom) - Special Session: Towards Machine-Learning Based Secure and Efficient 5G and Beyond Disaggregated Networks.
  5. B. Pismenny, J. J. Vegas Olmos, Y. Zack, L. Liss, A. Dömeke C. Stan C. R. Garcia, I. T. Monroy, P. Kokkinos A. Kretsis, E. Varvarigos, 'Securitization of cloud, edge and IoT communications through hardware accelerations/offloadings', 2021 IEEE International Mediterranean Conference on Communications and Networking (MeditCom) - Workshop: Intelligent operations, security, and acceleration for edge computing.
  6. A. Kretsis, P. Kokkinos, P. Soumplis, J. J. Vegas Olmos, M. Fehér, M. Sipos D. E. Lucani, D. Khabi, D. Masouros, K. Siozios, P. Bourgos, S. Tsekeridou, F. Zyulkyarov, E. Karanastasis, E. Chondrogiannis, V. Andronikou, A. Gomez, S. Panica, G. Iuhasz, A. Nanos, B. Chalios, E. Varvarigos, 'SERRANO: Transparent Application Deployment in a Secure, Accelerated and Cognitive Cloud Continuum'), 2021 IEEE International Mediterranean Conference on Communications and Networking (MeditCom) - Workshop: Intelligent operations, security, and acceleration for edge computing.
  7. A. Kretsis, P. Soumplis, P. Kokkinos, E. A. Varvarigos, An SDN Emulation Platform for Converged Fiber-Wireless 5G Networks, IEEE International Conference on Computer Communications and Networks (ICCN 2021), pp. 1-7, July 2021. (Invited)
  8. A. Valkanis, P. Nikopolitidis, G. Beletsioti, G. Papadimitriou, E. Varvarigos, A Traffic Prediction Assisted Routing Algorithm for Elastic Optical Networks, accepted in Intl Conference on Communications, Computing, Cybersecurity, and Informatics (CCCI 2021).
  9. K. Christodoulpoulos, I. Sartzetakis, P. Soumplis, E. Varvarigos, Machine Learning Assisted Quality of Transmission Estimation and Planning with Reduced Margins, 2020 International Conference on Optical Network Design and Modeling (ONDM 2020) (Invited)
  10. Konstantinos Seklos, Georgios Tsaousoglou, Konstantinos Steriotis, Nikolaos Efthymiopoulos, Prodromos Makris, Emmanouel Varvarigos, Designing a Distribution Level Flexibility Market using Mechanism Design and Optimal Power Flow, 3rd International Conference on Smart Energy Systems and Technologies (SEST), 7-9 September 2020, Istanbul, Turkey.
  11. Makris, P., Vergados, D.J., Mamounakis, I., Tsaousoglou, G., Steriotis, K., Efthymiopoulos, N. and Varvarigos, E., 2019. A Novel Research Algorithms and Business Intelligence Tool for Progressive Utility's Portfolio Management in Retail Electricity Markets. In 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) (pp. 1-5). IEEE.
  12. P. Kokkinos, P. Soumplis; A. Kretsis, E. Varvarigos, Network Slicing in 5G Infrastructures from the Edge to the Core, 12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP 2020).
  13. P. Soumplis, P. Kokkinos, D. Lagos, A. Kretsis, V. Sourlas, and E. Varvarigos, Network slicing and workload placement in megacities, 22nd International Conference on Transparent Optical Network (ICTON 2020), pp. 1-4.
  14. K. Mitropoulou, I. Sartzetakis, E. Varvarigos, Soft Failure Detection, Categorization and Localization, 22nd International Conference on Transparent Optical Network (ICTON 2020)
  15. C. A Kyriakopoulos, P. Nicopolitidis, G. I Papadimitriou, E. Varvarigos Adapting spectrum resources using predicted ip traffic in optical networks, Proceedings of the 17th International Joint Conference on E-business and Telecommunications, 2020.
  16. I. Sartzetakis, E. Varvarigos, "Dynamic Operation Strategy for Elastic Optical Networks" ONDM 2020.
  17. P. Soumplis, P. Kokkinos, E. Varvarigos, "Network Slicing in Fiber Wireless Fronthaul for 5G Networks", to appear 2020 International Conference on Optical Network Design and Modeling (ONDM 2020).

 

Publications : 2024

Journal Articles

  1. G. Tsaousoglou, P. Ellinas, J. S. Giraldo, E. Varvarigos, Distributed Sequential Optimal Power Flow under Uncertainty in Power Distribution Systems: A Data-driven Approach, Electric Power Systems Research, Elsevier, Volume 235, October 2024
  2. A. Khaksary, K. Steriotis, P. Makris, G. Tsaousoglou, N. Efthymiopoulos, E. Varvarigos, Electricity market equilibria analysis on the value of demand-side flexibility portfolios’ mix and the strategic demand aggregators’ market power, Sustainable Energy, Grids and Networks (SEGAN), Vol. 38, 2024
  3. A. Mitropoulou, P. Kokkinos, P. Soumplis, E. Varvarigos, Anomaly Detection in the Edge-Cloud Continuum using Knowledge Graph Embedding and Machine Learning Mechanisms, Journal of Grid Computing, Vol. 22(1), pp. 1-22, March 2024.

 

Conference Proceedings

  1. I. Sartzetakis, P. Pantazopoulos, K. V. Katsaros, V. Sourlas, E. Varvarigos, Dynamic Edge/Cloud Resource Allocation for Distributed Computation under Semi-Static Demands,"IEEE International Conference on Communications (ICC 2024),9–13 June 2024, Denver, CO, USA.
  2. A. Kretsis, P. Kokkinos, E. Varvarigos,D. Syrivelis, P. Bakopoulos, M. Sipos, M. Fehér, D.E. Lucani, J. M. Bernabe, A. Skarmeta, I. Paez, L. Cominardi, M. Mercier, P. Velho, Y. Georgiou, C. Mainas, A. Nanos, J. Martin, A. F. Gomez, R. Gonzalez, P. Ilias , T. Chalazas, K. Chintamani,"EMPYREAN: Trustworthy, Cognitive and AI-driven Collaborative Associations of IoT Devices and Edge Resources for Data Processing", 33rd International Symposium on High-Performance Parallel and Distributed Computing (HPDC 24), 3-7 June 2024, Pisa, Italy

 

Publications : 2022-2023

Journal Articles

  1. I. Sartzetakis, P. Soumplis, P. Pantazopoulos, K. V. Katsaros, V. Sourlas, E. Varvarigos, Edge/Cloud Infinite-time Horizon Resource Allocation for Distributed Machine Learning and General Tasks, IEEE Trans. on Network and Service Management, Sept. 2023.
  2. G. Tsaousoglou, P. Ellinas, E. Varvarigos, Operating Peer-to-Peer Electricity Markets under Uncertainty via Learning-Based, Distributed Optimal Control, Applied Energy, Elsevier, vol. 343, pp. 121234, August 2023, DOI: 10.1016/j.apenergy.2023.121234
  3. I. Sartzetakis, E. Varvarigos, Network Tomography with partial topology knowledge and dynamic routing, Journal of Network and Systems Management, Vol.31, 2023, doi:10.1007/s10922-023-09763-y
  4. K. Kontodimas, P. Soumplis, A. Kretsis, P. Kokkinos, M. Fehér, D. Lucani, E. Varvarigos, Secure Distributed Storage Orchestration on Heterogeneous Cloud-Edge Infrastructures, IEEE Transactions on Cloud Computing, June 2023.
  5. Barrachina-Muñoz, S.; Nikbakht, R.; Baranda, J.; Payaró, M.; Mangues-Bafalluy, J.; Kokkinos, P.; Soumplis , P.; Kretsis, A.; Varvarigos , E. ; Deploying cloud-native experimental platforms for zero-touch management 5G and beyond networks, IET networks, Vol. 31(4), pp. 73-93, Oct. 2023.
  6. W. Wang, K. Khalilpour, F. Karimi, D. Green, E. Varvarigos, Robustness analysis of electricity networks against failure or attack: the case of the Australian National Electricity Market (NEM), to appear in International Journal of Critical Infrastructure Protection.
  7. F. Karimi, D. Green, P. Matous, M. Varvarigos, K. R. Khalilpour, Network of Networks: A Bibliometric Analysis, Physica D: Nonlinear Phenomena, Elsevier, Vol. 421, pp. 1-11, July 2021. doi.org/10.1016/j.physd.2021.132889
  8. G. Tsaousoglou, K. Steriotis, N. Efthymiopoulos, P. Makris and E. Varvarigos, "Truthful, Practical and Privacy-Aware Demand Response in the Smart Grid via a Distributed and Optimal Mechanism," in IEEE Transactions on Smart Grid, vol. 11, no. 4, pp. 3119-3130, July 2020, doi: 10.1109/TSG.2020.2965221.
  9. G. Tsaousoglou, I. Sartzetakis, P. Makris, N. Efthymiopoulos, E. Varvarigos and N. G. Paterakis, "Flexibility Aggregation of Temporally Coupled Resources in Real-Time Balancing Markets Using Machine Learning," in IEEE Transactions on Industrial Informatics, vol. 18, no. 7, pp. 4342-4351, July 2022, doi: 10.1109/TII.2021.3132036.
  10. K. Steriotis, P. Makris, G. Tsaousoglou, N. Efthymiopoulos and E. Varvarigos, "Co-Optimization of Distributed Renewable Energy and Storage Investment Decisions in a TSO-DSO Coordination Framework," in IEEE Transactions on Power Systems, 2022, doi: 10.1109/TPWRS.2022.3212919.
  11. A. Valkanis, G. A. Beletsioti, P. Nicopolitidis, G. Papadimitriou, E. Varvarigos, Efficiency and Fairness Improvement for Elastic Optical Networks using Reinforcement Learning-based Traffic Prediction, IEEE/OSA Journal Optical Communications and Networking (JOCN), Vol. 14(3), pp. 25-42, 2022.
  12. G. Tsaousoglou, N. Efthymiopoulos, P. Makris and E. Varvarigos, "Multistage Energy Management of Coordinated Smart Buildings: A Multiagent Markov Decision Process Approach", IEEE Transactions on Smart Grid, Vol. 13(4), pp. 2788-2797, July 2022, doi: 10.1109/TSG.2022.3162915
  13. G. Tsaousoglou, P. Soumplis, N. Efthymiopoulos, K. Steriotis, A. Kretsis, P. Makris, P. Kokkinos, E. Varvarigos, "Demand Response as a Service: Clearing Multiple Distribution-Level Markets", IEEE Transactions on Cloud Computing (special issue), Vol. 10(1), pp. 82-96, 2022

 

Conference Proceedings

  1. A. Mitropoulou, P. Kokkinos, and E. Varvarigos, "Identifying Network Congestion Using Knowledge Graphs and Link Prediction",IEEE/ACM 16th International Conference on Utility and Cloud Computing (UCC '23), New York, NY, USA, Article 5, 1–6. https://doi.org/10.1145/3603166.3632129
  2. P. Soumplis, G. Kontos, A. Kretsis, P. Kokkinos, A. Nanos, and E. Varvarigos, "Security-Aware Resource Allocation in the  Edge-Cloud Continuum", IEEE 12th International Conference on Cloud Networking (CloudNet 2023)
  3. A.Nanos, A. Kretsis, C. Mainas, G. Ntouskos, A. Ferikoglou, D. Danopoulos, A. Kokkinis, D. Masouros, K. Siozios, P. Soumplis, P. Kokkinos, J.J. Vegas Olmos, and E. Varvarigos, "Hardware-Accelerated FaaS for the Edge-Cloud Continuum", Cloud-Edge Continuum Workshop (CEC23)
  4. A. Khaksary, K. Steriotis, G. Tsaousoglou, P. Makris, N. Efthymiopoulos and E. Varvarigos, "Electricity Market Equilibrium Analysis for Strategic Demand Aggregators: The Value of Demand Flexibility Portfolios' Mix," 2023 IEEE Belgrade PowerTech, Belgrade, Serbia, 2023, pp. 01-06, doi: 10.1109/PowerTech55446.2023.10202916
  5. I. Sartzetakis and E. Varvarigos, Machine Learning Network Tomography with Partial Topology Knowledge and Dynamic Routing, 2022 IEEE Global Communications Conference (GLOBECOM 2022), pp. 4922-4927, Dec. 2022.
  6. K. Mitropoulou, P. Kokkinos, P. Soumplis, E. Varvarigos, Detect Resource Related Events in a Cloud-Edge Infrastructure Using Knowledge Graph Embeddings and Machine Learning, 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP 2022), pp. 698-703, July 2022, doi: 10.1109/CSNDSP54353.2022.9908022
  7. I. Chochliouros, A. Kostopoulos, M. Payaró, C. Verikoukis, S. De Capitani di Vimercati, E. Vinogradov, V. Ranjbar, J. Vardakas, M. A. Rahman, P. Soumplis, E. Varvarigos, D. Kritharidis, K. Chartsias, Experimentation Scenarios for Machine Learning-Based Resource Management, 2021 IFIP International Conference on Artificial Intelligence Applications and Innovations (AIAI), pp. 120-133, June 2022, doi: 10.1007/978-3-030-79157-5_8
  8. A. Mathioudaki, G. Tsaousoglou, E. Varvarigos and D. Fotakis, An Online Truthful Algorithm for Menu-Based Scheduling in Electric Vehicle Charging Networks, IEEE International Conference on Smart Energy Systems and Technologies (SEST 2022), pp. 1-6, doi: 10.1109/SEST53650.2022.9898146
  9. P. Loulakis, G. Tsaousoglou and E. Varvarigos, Profitable Vehicle-to-Grid Services with Minimal Battery Degradation using Deep Reinforcement Learning, IEEE International Conference on Smart Energy Systems and Technologies (SEST 2022), pp. 1-6, doi: 10.1109/SEST53650.2022.9898151
  10. I. Sartzetakis, P. Soumplis, P. Pantazopoulos, K. V. Katsaros, V. Sourlas, E. Varvarigos, Resource Allocation for Distributed Machine Learning at the Edge-Cloud Continuum, IEEE International Conference on Communications (ICC 2022), May 2022, doi: 10.1109/ICC45855.2022.9838647
  11. A. Ferikoglou, I. Oroutzoglou, A. Kokkinis, D. Danopoulos, D. Masouros, E. Chondrogiannis, A. F. Gómez, A. Kretsis, P. Kokkinos, E. Varvarigos, K. Siozios Towards efficient HW acceleration in edge-cloud infrastructures: The SERRANO approach, Proc. International Conference on Embedded Computer System, pp. 354-367, 2022.

 

Book Chapters

  1. P. Soumplis, P. Kokkinos, A. Kretsis, P. Nicopolitidis, G. Papadimitriou, E. A. Varvarigos, Resource Allocation Challenges in the Cloud and Edge Continuum, in Book Advances in Computing, Informatics, Networking and Cybersecurity, Honoring Professor Mohammad S. Obaidat, 2022, Springer Cham, pp. 443-464.

 

Publications : 2016 - 2017

Journal Articles

  1. K. Christodoulopoulos, K. Kontodimas, A. Siokis, K. Yiannopoulos, and E. Varvarigos, “Efficient Bandwidth Allocation in the NEPHELE Optical/Electrical Datacenter Interconnect”, IEEE/OSA Journal of Optical Communications and Networking (JOCN), 9 (12), 1145-1160, 2017.
  2. G. Tsaousoglou, P. Makris, E. Varvarigos, “Electricity market policies for penalizing volatility and scheduling strategies: The value of aggregation, flexibility, and correlation”, Sustainable Energy, Grids and Networks (SEGAN), Vol. 12, pp. 57-68, 2017.
  3. P. Soumplis, K. Christodoulopoulos, M. Quagliotti, A. Pagano, E. Varvarigos, “Network planning with actual margins”, IEEE/OSA Journal of Lightwave Technology (JLT), 35 (23), 5105-5120, 2017.
  4. I. Gravalos, A. Siokis, P. Kokkinos, E. A. Varvarigos, "Energy-Optimal Routing on VCSEL-based Interconnected Networks", IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 9(10), pp. 833-843, 2017.
  5. L. Tomás, P. Kokkinos, V. Anagnostopoulos, O. Feder, D. Kyriazis, K. Meth, E. A. Varvarigos, D. Varvarigou, "Disaster Recovery Layer for OpenStack and Testbed", IEEE Transactions on Cloud Computing, 2017.
  6. P. Maniotis, N. Terzenidis, A. Siokis, K. Christodoulopoulos, E. Varvarigos, M. Immonen, H. J. Yan, L. X. Zhu, K. Hasharoni, R. Pitwon, K. Wang, N. Pleros, "Application-oriented On-board Optical Technologies for HPCs." IEEE/OSA Journal of Lightwave Technology (JLT), Volume 35, Issue 15, pp. 3197-3213, Aug. 2017.
  7. P. Papanikolaou, K. Christodoulopoulos, and E. Varvarigos, "Joint Multilayer Survivability Techniques for IP-over-Elastic Optical Networks", Journal of Optical Communications and Networking (JOCN), 9(1), A85-A98 (2017) [Invited].
  8. K. Kontodimas, P. Kokkinos, Y. Kuperman, A. Houbavlis, E. Varvarigos "Analysis and Evaluation of Scheduling Policies for Consolidated I/O Operations." Journal of Grid Computing, Vol. 15, No. 1, pp. 107-125, Jan 2017. DOI 10.1007/s10723-017-9392-4.
  9. C. Kyriakopoulos, P. Nicopolitidis, G. Papadimitriou, E. Varvarigos, "Energy-efficient Lightpath Establishment in Backbone Optical Networks Based on Ant Colony Optimization," IEEE/OSA Journal of Lightwave Technology, Vol. 34 (23), pp. 5534-5541, 2016.
  10. A. Siokis, K. Christodoulopoulos, N. Pleros, E. Varvarigos, "Electro-optic Switch Architectures Based on Space Switching of Multiplexed WDM Signals", Optical Switching and Networking (OSN), Elsevier, Volume 25, Pages 40–56,July 2017
  11. A. Siokis, K. Christodoulopoulos, E. Varvarigos, "Multi-point Architectures for On-board Optical Interconnects", Journal of Optical Communications and Networking (JOCN), No. 8 (11), 863-877, 2016.
  12. N. Doulamis, A. Doulamis, P. Kokkinos, E. Varvarigos, "Event Detection in Tweeter Microblogging", IEEE Transactions on Cybernetics, vol. 46, no. 12, pp. 2810-2824, Dec. 2016.
  13. C. A. Kyriakopoulos, G. I. Papadimitriou, P. Nicopolitidis, E. M. Varvarigos, "On the Use of Learning Automata for Energy Saving in Optical Backbone Networks", Electronic Notes in Discrete Mathematics, Vol. 5, pp. 15-22, 2016.
  14. M. Svaluto Moreolo, J. M. Fabrega, L. Martín, K. Christodoulopoulos, E. Varvarigos, and J. P. Fernández-Palacios, "Flexgrid Technologies Enabling BRAS Centralization in MANs", IEEE/OSA Journal of Optical Communications and Networking (JOCN) Vol. 8, Issue 7, pp. A64-A75, 2016.
  15. I. Gravalos, K. Yannopoulos, G. Papadimitriou, E. Varvarigos, 'Burst-by-Burst Dynamic Bandwidth Allocation for XG-PONs, IET Networks, Vol. 5 (3), pp. 47-55, 2016.
  16. I. Sartzetakis, K. Christodoulopoulos, C. P. Tsekrekos, D. Syvridis, E. Varvarigos, "Quality of Transmission Estimation in WDM and Elastic Optical Networks Accounting for Space–Spectrum Dependencies", IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 8, Iss. 9, pp. 676–688, 2016.
  17. D. Vergados, I. Mamounakis, P. Makris, E. Varvarigos, "Prosumer Clustering into Virtual Microgrids for Cost Reduction in Renewable Energy Trading Markets Sustainable Energy", Grids and Networks, Sustainable Energy, Grids and Networks, Elsevier, Vol. 7, pp. 90-103, July 2016.
  18. ACM DL Author-ize servicePanagiotis Kokkinos, Dimitris Kalogeras, Anna Levin, Emmanouel Varvarigos, Survey: Live Migration and Disaster Recovery over Long-Distance Networks, ACM Computing Surveys (CSUR), Vol. 49, No. 2, 26 pages, July 2016

 

Conference Proceedings

  1. N. Sambo, P. Giardina, I. Sartzetakis, A. Sgambelluri, F. Fresi, M. Dallaglio, G. Meloni, G. Bernini, K. Christodoulopoulos, P. Castoldi, E. Varvarigos, "Experimental demonstration of network automation based on QoT estimation and monitoring in both single- and multi-domains," in European Conference on Optical Communication (ECOC) 2017, paper Th.2.C.5.
  2. P. Soumplis, P. Kokkinos, E. Varvarigos, "Optimally-driven Online Reservations in Elastic Optical Networks", ECOC 2017.
  3. P. Kokkinos, I. Gravalos, A. Kretsis and E. Varvarigos, "Inter-Datacenter Virtual Capacity Services: Reality and Mechanism", IEEE 6th International Conference on Cloud Networking (CloudNet), pp. 150-154, Prague, Sept 2017.
  4. I Mamounakis, D. Vergados, P. Makris, E. Varvarigos, "Communication Costs Versus Smart Grid System Performance for Energy Prosumers Participation in Liberalized Electricity Markets: A Trade-off Analysis" 32nd Union of Radio Science General Assembly and Scientific Symposium (URSI GASS 2017), Montreal, Canada, August 19-26, 2017.
  5. I. Gravalos, A. Siokis, P. Kokkinos, E. A. Varvarigos, "Routing Algorithm with Smart Energy Management on VCSEL Interconnected Networks", 22nd IEEE Symposium on Computers and Communication (ISCC 2017), pp. 1049-1055, Heraklion, Greece, July 2017.
  6. K. Yiannopoulos, K. Kontodimas, K. Christodoulopoulos, E. Varvarigos, "Resource Partitioning in the NEPHELE Datacentre Interconnect", 19th International Conference on Transparent Optical Networks (ICTON 2017), pp. 1-4, July 2017. [invited]
  7. I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, "Improving QoT estimation accuracy through active monitoring", 19th International Conference on Transparent Optical Networks (ICTON 2017), pp. 1-4, July 2017. [invited]
  8. I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, "On Reducing Optical Monitoring Uncertainties and Localizing Soft Failures", ICC 2017, May 2017
  9. P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, "Incremental Planning of Multi-layer Elastic Optical Networks", International Conference Optical Network Design and Modeling (ONDM 2017), pp. 1-6, Budapest, May 2017.
  10. K. Christodoulopoulos, I. Sartzetakis, P. Soumplis, E. Varvarigos, "Cross-layer and Dynamic Network Orchestration Based on Optical Performance Monitoring", International Conference Optical Network Design and Modeling (ONDM 2017), pp. 1-6, Budapest, May 2017. [invited]
  11. I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos," QoT Aware Adaptive Elastic Optical Networks", OFC 2017, W4F.4, March 2017
  12. P. Soumplis, K. Christodoulopoulos, M. Quagliotti, A. Pagano, E. Varvarigos, "Actual Margins Algorithm for Multi-Period Planning", Optical Fiber Communication Conference (OFC 2107), W4F.1, LA, March 2017.
  13. G. Landi, I. Patronas, K. Kontodimas, M. Aziz, K. Christodoulopoulos, A. Kyriakos, M. Capitani, A. F. Hamedani, G. Bernini, D. Reisis, E. Varvarigos, P. Bakopoulos, H. Avramopoulos, "SDN Control Framework with Dynamic Resource Assignment for Slotted Optical Datacenter Networks", in SDN/NFV Demonstration Zone, Optical Fiber Communication Conference (OFC 2107), Tu3L. 1, LA, March 2017.
  14. I. Mamounakis, P. Makris. E. Varvarigos, "Renewable energy prosumers' clustering towards target aggregated prosumption profiles based on recursive predictions", IEEE PES PowerTech Manchester 2017.
  15. K. Christodoulopoulos, K. Kontodimas, A. Siokis, K. Yiannopoulos, E. Varvarigos, "Collisions free scheduling in the NEPHELE hybrid electrical/optical datacenter interconnect", IEEE International Conference on Electronics, Circuits and Systems (ICECS), 11-14 Dec. 2016, Monte Carlo, Monaco
  16. E. Konidis, P. Kokkinos, E. Varvarigos, "Evaluating Traffic Redirection Mechanisms for High Availability Servers",IEEE International Workshop on Cloud Computing Systems, Networks, and Applications (CCSNA), organized in conjunction with IEEE Global Communications Conference (GLOBECOM 2016), Washington D.C
  17. N. Sambo, K. Christodoulopoulos, P. Castoldi, E. Varvarigos, "Spectrum sharing for elastic transmission parameter adaptation", European Conference on Optical Communication (ECOC 2016), Düsseldorf, Germany, Sept. 2016.
  18. V. Gkamas, M. Paraskevas, E. Varvarigos, "Design of a secure BYOD policy for the Greek School Network: a case study", 19th IEEE International Conference on Computational Science and Engineering (CSE 2016), August 24-26, 2016 - Paris, France.
  19. Ganesh Sauba , Jos van der Burgt , Manos Varvarigos, Prodromos Makris, Ioannis Mamounakis , Dimitrios J. Vergados, "VIMSEN – New Energy Management Tool for RES Aggregators", IEEE International Conference on Emerging Technologies and Innovative Business Practices for the Transformation of Societies (EmergiTech), 2016
  20. G. Tsaousoglou, P. Makris, E. Varvarigos, "Micro grid scheduling policies, forecasting errors, and cooperation based on production correlation", 2nd International Conference on Intelligent Green Building and Smart Grid (IGBSG), 27-29 June, 2016
  21. K. Christodoulopoulos, K. Kontodimas, K. Yiannopoulos and E. Varvarigos, "Bandwidth allocation in the NEPHELE hybrid optical interconnect", 2016 18th International Conference on Transparent Optical Networks (ICTON), Trento, Italy, 2016, pp. 1-4 (invited).
  22. A. Kretsis, L. Corazza, K. Christodoulopoulos, P. Kokkinos and E. Varvarigos, "An emulation environment for SDN enabled flexible IP/optical networks", 2016 18th International Conference on Transparent Optical Networks (ICTON), Trento, 2016, pp. 1-4 (invited).
  23. I. Mamounakis, D. J. Vergados, P. Makris, E. Varvarigos, "A Virtual Microgrid Aggregator Platform for Distributed and Small-Scale RES Prosumers' Management", ICTF 2016 SMART_GRID 2016.
  24. ORCHESTRA - Optical Performance Monitoring Enabling Flexible Networking, European Conference on Networks and Communications 2016.
  25. I. Gravalos, P. Makris, K. Christodoulopoulos, E. A. Varvarigos, "Efficient Gateways Placement for Internet of Things with QoS Constraints", Globecom 2016, Washington D.C.
  26. C. Mavrokefalidis, D. Ampeliotis, E. Vlachos, K. Berberidis, and E. Varvarigos, "Supervised Energy Disaggregation using Dictionary- Based Modelling of Appliance States", ISGT, Europe 2016.
  27. P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, "Joint Multilayer Planning of Survivable Elastic Optical Networks", Optical Fiber Communication Conference (OFC 2016), M2K.3, March 2016.
  28. K. Christodoulopoulos, N. Sambo, E. Varvarigos, "Exploiting Network Kriging for Fault Localization", Optical Fiber Communication Conference (OFC 2016), W1B.5, March 2016.
  29. I. Sartzetakis, K. Christodoulopoulos, C. Tsekrekos, D. Syvridis, E. Varvarigos, "Estimating QoT of Unestablished Lightpaths", Optical Fiber Communication Conference (OFC 2016), Tu3F.2 , March 2016.

 

Book Chapters

  1. A. Siokis, K. Christodoulopoulos, E. Varvarigos, The role of optical interconnects in the design of data center architectures, Optical Interconnects for Data Centers, Woodhead Publishing Series in Electronic and Optical Materials, Chapter 17, Editors: T. Tekin, N. Pleros, R. Pitwon, A. Håkansson, pp. 375-393, 2017.
  2. C. Papageorgiou, P. Kokkinos, E. Varvarigos, Energy-efficient Unicast and Multicast Communication for Ad Hoc Networks Using Multiple Criteria, Chapter 8 in Mobile Ad hoc Networks: Current Status and Future Trends, Eds. Jonathan Loo, Jaime Lloret Mauri, Jesus Hamilton Ortiz, CRC press, ISBN 9781439856505, pp. 201-.., 2016.
  3. L. Velasco, M. Ruiz, K. Christodoulopoulos, M. Varvarigos, M. Żotkiewicz and M. Pióro, in Elastic Optical Networks, Chapter 4, Routing and Spectrum Allocation, Springer, pp. 55-84, 2016.
  4. A. Stavdas, C. Matrakidis, M. Gunkel, A. Asensio, L. Velasco, K. Christodoulopoulos, E. Varvarigos, in Elastic Optical Networks, Chapter 3, Taking Advantage of Elastic Optical Networks, Springer, pp. 31-54, 2016.
  5. C. Kyriakopoulos, G. Papadimitriou, P. Nicopolitidis, M. Varvarigos, Advanced Optical Network Architecture for the Next Generation Internet Access, Chapter 11 in book: Smart Cities and Homes: Key Enabling Technologies, Elsevier publisher, pp. 219-238, June 2016.

 

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  1. Publications : 2018 - 2019
  2. Publications : 2014-2015
  3. Publications : 2012-2013
  4. Publications : 2008-2009