List of Publications

Journal Articles

  1. L. Huang, G. Tzounas, On the duality between quantized time and states in dynamic simulation, IEEE Transactions on Power Systems, vol. 41, no. 2, pp. 1613-1616, Mar. 2026.

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  2. A. Bouterakos, G. Tzounas, Stability of the Theta method for systems with multiple time-delayed variables, International Journal of Electrical Power and Energy Systems, Elsevier, vol. 174, no. 111560, Jan. 2026.

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  3. A. Bouterakos, J. McKeon, G. Tzounas, On the eigenvalue tracking of large-scale systems, International Journal of Electrical Power and Energy Systems, Elsevier, vol. 172, no. 111310, Nov. 2025.

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  4. L. Huang, G. Tzounas, Matrix pencil-based analysis of multirate simulation schemes, International Journal of Electrical Power and Energy Systems, Elsevier, vol. 171, no. 111003, Oct. 2025.

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  5. Z. Alexakis, P. Papageorgiou, A. Alexandridis, F. Milano, G. Tzounas, Smooth rate limiter model for power system stability analysis and control, IEEE Transactions on Power Systems, vol. 40, no. 4, pp. 3611-3614, Jul. 2025.

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  6. I. Dassios, G. Tzounas, F. Milano, A bounded dynamical network of curves and the stability of its steady states, Mathematical Methods in the Applied Sciences, Wiley, vol. 48, no. 7, pp. 7906-7917, May 2025.

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  7. A. Alshawabkeh, G. Tzounas, A. Molina-Garcia, F. Milano, Instantaneous frequency estimation in unbalanced systems using affine differential geometry, IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 77, no. 1, pp. 343-347, Jan. 2025.

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  8. F. Milano, G. Tzounas, I. Dassios, Instantaneous power theory revisited with classical mechanics, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 71, no. 12, pp. 6080-6093, Dec. 2024.

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  9. I. Dassios, G. Tzounas, F. Milano, Voltage differences as functions of a matrix eigensystem, Sustainable Energy, Grids and Networks, Elsevier, vol. 39, no. 101448, Sep. 2024.

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  10. I. Dassios, G. Tzounas, F. Milano, A. Jivkov, A discrete model on force-based elasticity and plasticity, Journal of Computational and Applied Mathematics, Elsevier, vol. 444, no. 115796, Jul. 2024.

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  11. D. Moutevelis, G. Tzounas, J. Roldan-Pérez, F. Milano, Modal propagation analysis with participation factors of complex frequency variables, Electric Power Systems Research, Elsevier, vol. 230, no. 110295, May 2024.

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  12. G. Tzounas, G. Hug, Unified numerical stability and accuracy analysis of the partitioned-solution approach, IEEE Transactions on Power Systems, vol. 39, no. 2, pp. 3141-3152, Mar. 2024.

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  13. F. Milano, B. Alhanjari, G. Tzounas, Enhancing frequency control through rate of change of voltage feedback, IEEE Transactions on Power Systems, vol. 39, no. 1, pp. 2385-2388, Jan. 2024.

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  14. I. Dassios, G. Tzounas, F. Milano, A formula of solutions for non-autonomous linear difference equations with a fractional forward operator, Journal of Computational and Nonlinear Dynamics, ASME, vol. 18, no. 7, Jul. 2023.

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  15. I. Dassios, G. Tzounas, F. Milano, Stability criterion of a class of non-causal systems of differential equations, Circuits, Systems, and Signal Processing, Springer, vol. 42, pp. 2452-2467, Apr. 2023.

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  16. G. Tzounas, I. Dassios, F. Milano, Frequency divider as a continuum, IEEE Transactions on Power Systems, vol. 37, no. 6, pp. 4970-4973, Nov. 2022.

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  17. G. Tzounas, I. Dassios, F. Milano, Small-signal stability analysis of numerical integration methods, IEEE Transactions on Power Systems, vol. 37, no. 6, pp. 4796-4806, Nov. 2022.

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  18. W. Zhong, G. Tzounas, F. Milano, Improving the power system dynamic response through a combined voltage-frequency control of distributed energy resources, IEEE Transactions on Power Systems, vol. 37, no. 6, pp. 4375-4384, Nov. 2022.

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  19. W. Zhong, G. Tzounas, M. Liu, F. Milano, On-line inertia estimation of virtual power plants, Electric Power Systems Research, Elsevier, vol. 212, no. 108336, Nov. 2022.

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  20. T. Kërçi, G. Tzounas, F. Milano, A dynamic behavioral model of the long-term development of solar photovoltaic generation driven by feed-in tariffs, Energy, Elsevier, vol. 256, no. 124506, Oct. 2022.

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  21. G. Tzounas, I. Dassios, F. Milano, Small-signal stability analysis of implicit integration methods for power systems with delays, Electric Power Systems Research, Elsevier, vol. 211, no. 108266, Oct. 2022.

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  22. F. Milano, M. Liu, M. A. A. Murad, G. Jonsdottir, G. Tzounas, M. Adeen, I. Dassios, A. Ortega, Power system modelling as stochastic functional hybrid differential-algebraic equations, vol. 5, no. 5, pp. 309-331, IET Smart Grid, Oct. 2022. This paper was selected as the journal's featured article for Issue 5, 2022.

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  23. F. Sanniti, G. Tzounas, R. Benato, F. Milano, Curvature-based control for low-inertia systems, IEEE Transactions on Power Systems, vol. 37, no. 5, pp. 4149-4152, Sep. 2022.

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  24. I. Dassios, G. Tzounas, F. Milano, M. Liu, F. Milano, Singular over-determined systems of linear differential equations, Mathematics and Computers in Simulation, Elsevier, vol. 197, pp. 396-412, Jul. 2022.

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  25. F. Milano, G. Tzounas, I. Dassios, M. A. A. Murad, T. Kërçi, Using differential geometry to revisit the paradoxes of the instantaneous frequency, IEEE Open Access Journal of Power and Energy, Invited Papers on Emerging Topics in PES, vol. 9, pp. 501-513, Jun. 2022.

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  26. F. Milano, G. Tzounas, I. Dassios, T. Kërçi, Applications of the Frenet frame to electric circuits, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 69, no. 4, pp. 1668-1680, Apr. 2022.

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  27. G. Tzounas, R. Sipahi, F. Milano, Damping power system electromechanical oscillations using time delays, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 68, no. 6, pp. 2725-2735, Jun. 2021.

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  28. G. Tzounas, F. Milano, Delay-based decoupling of power system models for transient stability analysis, IEEE Transactions on Power Systems, vol. 36, no. 1, pp. 464-473, Jan. 2021.

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  29. I. Dassios, G. Tzounas, F. Milano, Robust stability criterion for perturbed singular systems of linearized differential equations, Journal of Computational and Applied Mathematics, Elsevier, vol. 381, no. 113032, Jan. 2021.

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  30. G. Tzounas, I. Dassios, M. A. A. Murad, F. Milano, Theory and implementation of fractional order controllers for power system applications, IEEE Transactions on Power Systems, vol. 35, no. 6, pp. 4622-4631, Nov. 2020.

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  31. I. Dassios, G. Tzounas, F. Milano, Generalized fractional controller for singular systems of differential equations, Journal of Computational and Applied Mathematics, Elsevier, vol. 378, 112919, Nov. 2020.

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  32. G. Tzounas, F. Milano, I. Dassios, M. Liu, F. Milano, Comparison of numerical methods and open-source libraries for eigenvalue analysis of large-scale power systems, Applied Sciences, MDPI, Special Issue: Methods in Dynamical Systems, Mathematics of Networks, and Optimization for Modelling in Engineering, vol. 10, no. 21, 7592, Oct. 2020.

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  33. M. Liu, I. Dassios, G. Tzounas, F. Milano, Model-independent derivative control delay compensation methods for power systems, Energies, MDPI, Special Issue: Advanced Solutions for Monitoring, Protection and Control of Modern Power Transmission System, vol. 13, no. 2, Jan. 2020.

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  34. G. Tzounas, I. Dassios, F. Milano, Modal participation factors of algebraic variables, IEEE Transactions on Power Systems, vol. 35, no. 1, pp. 742-750, Jan. 2020.

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  35. I. Dassios, G. Tzounas, F. Milano, Participation factors for singular systems of differential equations, Circuits, Systems, and Signal Processing, Springer, vol. 39, no. 1, pp. 83-110, Jan. 2020.

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  36. I. Dassios, G. Tzounas, F. Milano, The Möbius transform effect in singular systems of differential equations, Applied Mathematics and Computation, Elsevier, vol. 361, pp. 338-353, Nov. 2019.

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  37. M. Liu, I. Dassios, G. Tzounas, F. Milano, Stability analysis of power systems with inclusion of realistic-modeling of WAMS delays, IEEE Transactions on Power Systems, vol. 34, no. 1, pp. 627-636, Jan. 2019.

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Books

  1. F. Milano, I. Dassios, M. Liu, G. Tzounas, Eigenvalue Problems in Power Systems, CRC Press, Taylor & Francis Group, 2020.

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Book Chapters

  1. G. Tzounas, I. Dassios, M. Liu, R. Sipahi, F. Milano, Small-Signal Stability and Time Domain Analysis of Delayed Power Systems, Chapter 17 in Advances in Power System Modelling, Control and Stability Analysis, IET, 2nd edition, 2022.

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  2. G. Tzounas, M. A. A. Murad, W. Zhong, F. Milano, Combined Voltage-Frequency Control With Power Electronics-Based Devices, Chapter 12 in Advances in Power System Modelling, Control and Stability Analysis, IET, 2nd edition, 2022.

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Peer-Reviewed Conference Papers

  1. L. Huang, F. Milano, G. Tzounas, Ill-conditioned power flow analysis using a quantized state-based approach, IEEE PES General Meeting, Montréal, Canada, 19-23 Jul. 2026.

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  2. G. Tzounas, F. Milano, On the emulation of synchronous machine dynamics by converter-interfaced generators, IEEE PES General Meeting, Orlando, FL, 16-20 Jul. 2023.

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  3. C. Tajoli, G. Tzounas, G. Hug, Mode-shape deformation of power system DAEs by time-domain integration methods, IEEE PowerTech, Belgrade, Serbia, 25-29 Jun. 2023.

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  4. W. Zhong, G. Tzounas, F. Milano, Voltage stability enhancement through active power control of converter-interfaced generation, IEEE ISGT-Asia, Singapore, 2-5 Nov. 2022.

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  5. G. Tzounas, F. Milano, On the numerical stability and accuracy of one-step delay approximations, IEEE PES General Meeting, Denver, CO, 17-21 Jul. 2022.

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  6. W. Zhong, G. Tzounas, F. Milano, Real-time estimation of VPP equivalent inertia and fast frequency control, IEEE PES General Meeting, Denver, CO, 17-21 Jul. 2022.

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  7. G. Tzounas, F. Milano, Improving the frequency response of DERs through voltage feedback, IEEE PES General Meeting, Washington, DC, 25-29 Jul. 2021. The paper was included in the session Best Papers on Bulk Power Generation and Transmission.

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  8. T. Kërçi, G. Tzounas, I. Dassios, M. A. A. Murad, F. Milano, A short-term dynamic electricity market model with memory effect, IEEE PES General Meeting, Washington, DC, 25-29 Jul. 2021.

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  9. M. A. A. Murad, G. Tzounas, F. Milano, Modeling and simulation of fractional order PI control limiters for power systems, 21st IFAC World Congress (IFAC 2020), Berlin, Germany, 12-17 Jul. 2020.

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  10. G. Tzounas, F. Milano, Impact of the estimation of synchronous machine rotor speeds on wide area damping controllers, IEEE PES General Meeting, Atlanta, GA, 4-8 Aug. 2019.

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  11. M. A. A. Murad, G. Tzounas, F. Milano, Frequency control through voltage regulation of power system using SVC devices, IEEE PES General Meeting, Atlanta, GA, 4-8 Aug. 2019.

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  12. G. Tzounas, M. Liu, M. A. A. Murad, F. Milano, Impact of realistic bus frequency measurements on wide-area power system stabilizers, IEEE PowerTech, Milano, Italy, 23-27 Jun. 2019.

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  13. M. Liu, G. Tzounas, F. Milano, A model-independent delay compensation method for power systems, IEEE PowerTech, Milano, Italy, 23-27 Jun. 2019.

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  14. G. Tzounas, M. Liu, M. A. A. Murad, F. Milano, Stability analysis of wide area damping controllers with multiple time delays, 10th Symposium on Control of Power and Energy Systems (IFAC CPES), Tokyo, Japan, 4-6 Sep. 2018.

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  15. T. Souxes, G. Tzounas, C. Vournas, Effect of wind variability in the emergency reactive support provided by wind farms, IEEE PowerTech, Manchester, UK, 18-22 Jun. 2017.

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Technical Reports

  1. G. Tzounas, F. Milano, EU H2020 Project edgeFLEX - Deliverable 2.3: Frequency control concept for Energy Communities with future VPPs, Mar. 2022.

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  2. G. Tzounas, J. Chen, T. Kërçi, W. Zhong, F. Milano, EU H2020 Project edgeFLEX - Deliverable 2.2: Frequency control concepts for current VPPs in large scale deployment, Mar. 2021.

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  3. G. Tzounas, F. Milano, J. Chen, T. Kërçi, W. Zhong, D. Nouti, G. Lipari, EU H2020 Project edgeFLEX - Deliverable 2.1: Scenario description for frequency and inertial response control for VPPs, Mar. 2021.

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Theses

  1. G. Tzounas, Small-Signal Stability Techniques for Power System Modal Analysis, Control, and Numerical Integration, PhD Thesis, University College Dublin, Ireland, Oct. 2020.

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  2. G. Tzounas, Impact of Wind Generation on the Maximum Power Transfer of an Electric Power Transmission System, Diploma Thesis (in Greek), National Technical University of Athens, Greece, Dec. 2016.

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Work in Progress

  1. Z. Alexakis, P. Papageorgiou, A. Alexandridis, G. Tzounas, C. Konstantinou, Coordinated power regulation of clustered IBRs within grid-connected local energy communities, submitted to the IEEE Transactions on Smart Grid, under review.

  2. A. Bouterakos, G. Tzounas, Eigenvalue tracking of large-scale systems impacted by time delays, submitted to the Journal of Modern Power Systems and Clean Energy, under review.

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  3. L. Huang, A. Rahman, G. Tzounas, Wave-based spectral analysis of disturbance propagation, in preparation.

  4. F. Milano, G. Tzounas, I. Dassios, Kinematics and Dynamics of Electric Circuits, in preparation.