https://scholar.google.com/citations?hl=en&user=LUZzWXcAAAAJ
https://orcid.org/0000-0001-8888-301X
https://www.scopus.com/authid/detail.uri?authorId=22834822000
Assist. Prof.
Ulaş Karaağaç
Room No
E-115
Tel No
+90 (312) 210-2355
E-mail
ulaskar metu.edu.tr

Education

  • B.Sc. in Electrical and Electronics Engineering, Middle East Technical University, Ankara, TURKEY, Sep. 1995 - June 1999
  • M.Sc. in Electrical and Electronics Engineering, Middle East Technical University, Ankara, TURKEY, Feb. 2000 - Aug. 2002
  • Ph.D. in Electrical and Electronics Engineering, École Polytechnique, Université de Montréal, Montréal, QC, CANADA, Sep. 2007 - Nov. 2011

Research Interests

  • Integration of large-scale renewables into power grids
  • Future of transmission systems including HVDC grids
  • Smart grids
  • Power systems dynamics and control
  • Power system protection
  • Power system transients
  • Power system simulation (from steady state to electromagnetic transients)
  • Computational methods and models for simulating large-scale power systems

Work Experience

  • Middle East Technical University, Ankara, TURKEY,
    Assistant Professor, Apr. 2025 - Present
    Part-time Lecturer, Feb.2024 - Apr. 2025
  • PGSTech, Montréal, QC, CANADA
    Power System Software Development Expert, Feb.2024 - Apr. 2025
  • The Hong Kong Polytechnic University, HONG KONG
    Assistant Professor, Aug. 2019 - Dec. 2023 (Resigned due to personal reasons)
    Research Assistant Professor, Jan. 2017 - July 2019
  • École Polytechnique, Université de Montréal, Montréal, QC, CANADA
    Senior Researcher, Sep. 2014 - Dec. 2016
    Postdoctoral Fellow, Jan. 2012 - Aug. 2014
    PhD Scholar, Sep. 2007 - Dec. 2011
  • TUBITAK-BILTEN, Hardware Development and Power Systems Group, Ankara, TURKEY
    Chief R&D Engineer, June 2006 - Aug. 2007
    Specialized R&D Engineer, May 2003 - May 2006
    R&D Engineer, Nov. 1999 - Apr. 2003
  • PARMAS Engineering and Industrial Research Company, Ankara, TURKEY
    Engineer, July 1999 - Nov. 1999
    Candidate Engineer, July 1998 - June 1999

    Publications

    Book Chapters:
    1. Y. Seyedi, U. Karaagac, J. Mahseredjian, A. Haddadi, K. Jacobs, H. Karimi, “Detailed modeling of inverter-based resources” Book, F. Milano (Editor), “Advances in Power System Modelling, Control and Stability Analysis”, 2nd ed., Chap. 5, pp. 175-203, Energy Engineering, IET, 2022.
    2. Y. Seyedi, U. Karaagac, J. Mahseredjian, H. Karimi, “Scanning methods for stability analysis of inverter-based resources” Book, F. Milano (Editor), “Advances in Power System Modelling, Control and Stability Analysis”, 2nd ed., Chap. 20, pp. 663-694, Energy Engineering, IET, 2022.
    3. J. Mahseredjian, U. Karaagac, S. Dennetière, H. Saad, “Simulation of electromagnetic transients with EMTP-RV”, Book, A. Ametani (Editor), “Numerical Analysis of Power System Transients and Dynamics”, Chap. 3, pp. 103-134, IET, 2015.
    4. J. Mahseredjian, I. Kocar, U. Karaagac, “Solution Techniques for Electromagnetic Transients in Power Systems”, Book, Juan A. Martinez-Velasco (Editor), “Transient Analysis of Power Systems: Solution Techniques, Tools and Applications”, Chap. 2, pp. 9-38, Wiley, 2014.
    5. U. Karaagac, J. Mahseredjian and J. A. Martinez-Velasco, “Synchronous machines”, Book, Juan A. Martinez-Velasco (Editor) “Power System Transients: Parameter Determination”, Chap. 5, pp. 251-250, CRC Press, Taylor & Francis Group, 2010.
    Chapter in IEEE Tutorial Book:
    • J. Mahseredjian, J. L. Naredo, U. Karaagac, J. A. Martinez–Velasco: “Off-line Simulation Methods and Tools for Electromagnetic Transients in Power Systems: Overview and Challenges”, IEEE/PES Tutorial on Electromagnetic Transients in Power Systems. IEEE Catalog Nr. 11TP255E, ISBN 978-1-4577-1501-3, July 2010
    Articles in Refereed Publications:
    1. L. Meng, U. Karaagac, J. Mahseredjian, A. Pavani and K. Jacobs, “Examination of EMT-Level Impedance Scanning Techniques for Small Signal Stability Assessment of Inverter Based Resources,” IEEE Trans. Power Del., vol. 40, no. 3, pp. 1607-1620, June 2025.
    2. T. Xue, U. Karaagac, M. Ghafouri and I. Kocar, "Review on DFIG Supplementary SSI Damping Controllers: Design, Development, and Directions," IEEE Trans. Power Del., vol. 40, no. 2, pp. 797-809, April 2025.
    3. Z. Javid, I. Kocar, W. Holderbaum and U. Karaagac, “Future Distribution Networks: A Review,” Energies, vol. 17, no. 8, p. 1822, April 2024.
    4. T. Xue, U. Karaagac, L. Cai, and I. Kocar, “Re-examination of DFIG-based Wind Park Small-Signal Instability,” IEEE Access, vol. 11, pp. 141740-141752, 2023.
    5. L. Meng, U. Karaagac, I. Kocar, M. Ghafouri, A. Stepanov and J. Mahseredjian, “A New Control Interaction Phenomenon in Large-Scale Type-4 Wind Park,” IEEE Access, vol. 11, pp. 132822-132832, 2023.
    6. L. Meng, T. Xue, U. Karaagac and L. Cai, “A Combined dq MIMO and Sequence SISO Impedance-based Stability Analysis for IBRs,” Energy Reports, vol. 9, no. 12, pp. 454-459, Nov. 2023.
    7. Z. Javid, U. Karaagac, I. Kocar and W. Holderbaum, "SST Modelling for Power Flow Equations with Robust Nodal Analysis Approach," Energy Reports, vol. 9, no. 12, pp. 448-453, Nov. 2023.
    8. Z. Javid, T. Xue, U. Karaagac and I. Kocar, "Unified Load Flow Solver for Hybrid AC/DC Distribution Networks," IEEE Trans. Power Del., vol. 38, no. 5, pp. 3322-3332, Oct. 2023.
    9. T. Xue, U. Karaagac, H. Xue and J. Mahseredjian, “Re-examination of Small-Signal Instability in Weak Grid-Connected Voltage Source Converters,” Electr. Power Syst. Res., vol. 223, article: 109625, Oct. 2023.
    10. M. Ghafouri, U. Karaagac, I. Kocar, J. Mahseredjian and L. Meng, “A Practicable H∞-based SSI Damping Controller for Series Compensated DFIG-based Wind Farms,” Energy Reports, vol. 9, no. 10, pp. 647-655, Oct. 2023.
    11. L. Meng, U. Karaagac, M. Ghafouri, A. Stepanov and J. Mahseredjian, “A New Stationary Frame Multi-Input Multi-Output EMT-Level Frequency Scanning Method for Inverter Based Resources,” Energy Reports, vol. 9, no. 10, pp. 748-756, Oct. 2023.
    12. T. Xue, U. Karaagac and M. Ghafouri “Impact of DFIG Impedance Model Precision on Stability Analysis,” Energy Reports, vol. 9, no. 10, pp. 920-929, Oct. 2023.
    13. Z. Javid, U. Karaagac, I. Kocar and T. Xue, “DC Grid Load Flow Solution Incorporating Generic DC/DC Converter Topologies,” Energy Reports, vol. 9, no. 10, pp. 951-961, Oct. 2023.
    14. Z. Javid, U. Karaagac and I. Kocar, "MANA Formulation Based Load Flow Solution for DC Distribution Networks," IEEE Trans. Circuits Syst. II: Express Br., vol. 70, no. 7, pp. 2590-2594, July 2023.
    15. N. Rashidirad, J. Mahseredjian, I. Kocar and U. Karaagac, “Unified MANA-Based Load-Flow for Multi-Frequency Hybrid AC/DC Multi-Microgrids,” Electr. Power Syst. Res., vol. 220, article: 109313, July 2023.
    16. L. Meng, U. Karaagac and K. Jacobs, “A New Sequence Domain EMT-Level Multi-Input Multi-Output Frequency Scanning Method for Inverter Based Resources,” Electr. Power Syst. Res., vol. 220, article: 109312, July 2023.
    17. Y. Seyedi, K. Jacobs, L. Meng, U. Karaagac, and Jean Mahseredjian, “A Comparative Study on Frequency Scanning Techniques for Stability Assessment in Power Systems Incorporating Wind Parks,” Electr. Power Syst. Res., vol. 220, article: 109311, July 2023.
    18. N. Rashidirad, J. Mahseredjian, I. Kocar, U. Karaagac and O. Saad, "MANA-Based Load-Flow Solution for Islanded AC Microgrids," IEEE Trans. Smart Grid, vol. 14, no. 2, pp. 889-898, March 2023.
    19. Z. Javid, U. Karaagac and I. Kocar, “Improved Laplacian Matrix Based Power Flow Solver for DC Distribution Networks,” Energy Reports, vol. 8, no. 8, pp. 528-537, Nov. 2022.
    20. R. Hassani, J. Mahseredjian, T. Tshibungu, and U. Karaagac, “Evaluation of time-domain and phasor-domain methods for power system transients,” Electr. Power Syst. Res., vol. 212, article: 108335, Nov. 2022.
    21. Y. Seyedi, J. Mahseredjian, H. Karimi, U. Karaagac and A. S. Trevisan, “Fast Detection of SSR for Wind Parks Connected to Series-Compensated Transmission Systems,” Electr. Power Syst. Res., vol. 211, article: 108321, Oct. 2022.
    22. Y. Chang, J. Mahseredjian, I. Kocar and U. Karaagac, “Analytical characterization of DFIG response to asymmetrical voltage dips for efficient design,” Electr. Power Syst. Res., vol. 211, article: 108553, Oct. 2022.
    23. Y. Chang, I. Kocar, J. Hu, U. Karaagac, K. W. Chan and J. Mahseredjian, "Coordinated Control of DFIG Converters to Comply with Reactive Current Requirements in Emerging Grid Codes," J. Mod. Power Syst. Clean Energy, vol. 10, no. 2, pp. 502-514, March 2022.
    24. M. Ghafouri, U. Karaagac, A. Ameli, J. Yan and C. Assi, "A Cyber Attack Mitigation Scheme for Series Compensated DFIG-Based Wind Parks,” IEEE Trans. Smart Grid, vol. 12, no. 6, pp. 5221-5232, Nov. 2021.
    25. M. Ghafouri, U. Karaagac, I. Kocar, Z. Xu and E. Farantatos, “Analysis and Mitigation of the Communication Delay Impacts on Wind Farm Central SSI Damping Controller,” IEEE Access, vol. 9, pp. 105641-105650, 2021.
    26. J. Luo, Y. Zou, S. Bu and U. Karaagac, “Converter-driven Stability Analysis of Power Systems Integrated with Hybrid Renewable Energy Sources,” Energies, vol. 14, no. 14, p. 4290, 2021.
    27. U. Karaagac, , I. Kocar, J. Mahseredjian, L. Cai and Z. Javid, “STATCOM Integration into a DFIG-based Wind Park for Reactive Power Compensation and its Impact on Wind Park High Voltage Ride-Through Capability,” Electr. Power Syst. Res., vol. 199, article: 107368, Oct. 2021.
    28. R. M. Furlaneto, I. Kocar, A.Grilo-Pavani, U. Karaagac, A. Haddadi, and E. Farantatos, “Short Circuit Network Equivalents of Systems with Inverter-based Resources,” Electr. Power Syst. Res., vol. 199, article: 107314, Oct. 2021.
    29. A. Stepanov, J. Mahseredjian, H. Saad and U. Karaagac, “Parallelization of MMC Detailed Equivalent Model,” Electr. Power Syst. Res., vol. 195, article: 107168, June 2021.
    30. A. Stepanov, J. Mahseredjian, U. Karaagac and H. Saad, “Adaptive Modular Multilevel Converter Model for Electromagnetic Transient Simulations,” IEEE Trans. Power Del., vol. 36, no. 2, pp. 803-813, April 2021.
    31. Z. Javid, U. Karaagac, I. Kocar and K. W. Chan, “Laplacian Matrix Based Power Flow Formulation for LVDC Grids with Radial and Meshed Configuration,” Energies, vol. 14, no. 7, p. 1866, March 2021.
    32. A. Haddadi, E. Farantatos, I. Kocar, and U. Karaagac, “Impact of Inverter Based Resources on System Protection,” Energies, vol. 14, no. 4, p. 1050, Feb. 2021.
    33. A. Haddadi, M. Zhao, I. Kocar, U. Karaagac, K. W. Chan, and E. Farantatos, “Impact of Inverter-Based Resources on Negative Sequence Quantities-Based Protection Elements,” IEEE Trans. Power Del., vol. 36, no. 1, pp. 289-298, Feb. 2021.
    34. A. Stepanov, H. Saad, U. Karaagac and J. Mahseredjian, “Spurious Power in Modular Multilevel Converter Models,” Electr. Power Syst. Res., vol. 190, article: 106704, 2021.
    35. A. Haddadi, I. Kocar, J. Mahseredjian, U. Karagaac, and E. Farantatos, “Negative sequence protection under inverter-based resources—challenges and impact of the German grid code,” Electr. Power Syst. Res., vol. 188, article: 106573, 2020.
    36. A. Stepanov, H. Saad, U. Karaagac and J. Mahseredjian, “Spurious Power Losses in Modular Multilevel Converter Arm Equivalent Model,” IEEE Trans. Power Del., vol. 35, no. 1, pp. 205-213, Feb. 2020.
    37. A. Abusalah, O. Saad, J. Mahseredjian, U. Karaagac, I. Kocar, “Parallel Sparse Matrix Based Computation of Electromagnetic Transients,” IEEE Open Access Journal of Power and Energy, vol. 7, pp. 13-21, 2020.
    38. M. Ghafouri, U. Karaagac, H. Karimi and J. Mahseredjian, “Robust Subsynchronous Interaction Damping Controller for DFIG-Based Wind Farms,” J. Mod. Power Syst. Clean Energy, vol. 7, issue 6, pp. 1663-1674, Nov. 2019.
    39. Z. T. Kauffmann, U. Karaagac, I. Kocar, S. Jensen, E. Farantatos, A. Haddadi and J. Mahseredjian, “Short-Circuit Model for Type IV Wind Turbine Generators with Decoupled Sequence Control,” IEEE Trans. Power Del., vol. 34, no. 5, pp. 1998-2007, Oct. 2019.
    40. U. Karaagac, J. Mahseredjian, R. Gagnon, H. Gras, H. Saad, L. Cai , I. Kocar, A. Haddadi, E. Farantatos, S. Bu, K. W. Chan, L. Wang, “A Generic EMT-type Simulation Model for Wind Parks with Permanent Magnet Synchronous Generator Full Size Converter Wind Turbines,” IEEE Power Energy Technol. Syst. J., vol. 6, no. 3, pp. 131-141, Sept. 2019.
    41. A. Haddadi, I. Kocar, T. Kauffmann, U. Karaagac, E. Farantatos and J. Mahseredjian, “Field Validation of Generic Wind Park Models using Fault Records,” J. Mod. Power Syst. Clean Energy, vol. 7, issue 4, pp. 826–836, July 2019.
    42. M. Ghafouri, U. Karaagac, J. Mahseredjian and H. Karimi, “SSCI Damping Controller Design for Series Compensated DFIG based Wind Parks Considering Implementation Challenges” IEEE Trans. Power Syst., vol. 34, no. 4, pp. 2644-2653, July 2019.
    43. A. Haddadi, I. Kocar, U. Karaagac, H. Gras and E. Farantatos, “Impact of Wind Generation on Power Swing Detection,” IEEE Trans. Power Del.,vol. 34, no. 3, pp. 1118-1128, June 2019.
    44. A. Belqorchi, U. Karaagac, J. Mahseredjian and I. Kamwa, “Standstill Frequency Response Test and Validation of a Large Hydrogenerator,” IEEE Trans. Power Syst., vol. 34, no. 3, pp. 2261-2269, May 2019.
    45. M. Cai, J. Mahseredjian, U. Karaagac, A. El-Akoum and X. Fu, “Functional Mock-up Interface Based Parallel Multistep Approach with Signal Correction for Electromagnetic Transients Simulations,” IEEE Trans. Power Syst., vol. 34, no. 3, pp. 2482-2484, May 2019./li>
    46. A. Stepanov, H. Saad, U. Karaagac and J. Mahseredjian, “Initialization of Modular Multilevel Converters for the Simulation of Electromagnetic Transient,” IEEE Trans. Power Del., vol. 34, no. 1, pp. 290-300, Feb. 2019.
    47. A. Abusalah, O. Saad, J. Mahseredjian, U. Karaagac, L. Gerin-Lajoie and I. Kocar, “CPU Based Parallel Sparse Solver for Electromagnetic Transient Simulations for Large Scale Power Grids,” Electr. Power Syst. Res., vol. 162, pp. 57-63, Sep. 2018.
    48. U. Karaagac, J. Mahseredjian, S. Jensen, R. Gagnon, M. Fecteau and I. Kocar, “Safe Operation of DFIG based Wind Parks in Series Compensated Systems,” IEEE Trans. Power Del., vol. 33, no. 2, pp. 709 - 718, April 2018.
    49. I. Kocar, U. Karaagac, J. Mahseredjian and B. Cetindag, “Multiphase Load-flow Solution and Initialization of Induction Machines,” IEEE Trans. Power Syst., vol. 33, no. 2, pp. 1650-1658, March 2018.
    50. T. Kauffmann, U. Karaagac, I. Kocar, S. Jensen, J. Mahseredjian, E. Farantatos, “An Accurate Type III Wind Turbine Generator Short Circuit Model for Protection Applications,” IEEE Trans. Power Del., vol. 32, no. 6, pp. 2370-2379, Dec. 2017.
    51. M. Ghafouri, U. Karaagac, H. Karimi, S. Jensen, J. Mahseredjian and S. O. Faried, “An LQR Controller for Damping of Subsynchronous Interaction in DFIG-Based Wind Farms,” IEEE Trans. Power Syst., vol. 32, no. 6, pp. 4934-4942, Nov. 2017.
    52. B. Cetindag, I. Kocar, A. Gueye and U. Karaagac, “Modeling of Step Voltage Regulators in Multiphase Load Flow Solution of Distribution Systems using Newton’s Method and Augmented Nodal Analysis,” Electric Power Components and Systems, Vol. 45, Iss. 15, 2017.
    53. U. Karaagac, J. Mahseredjian, L. Cai and H. Saad, “Offshore Wind Farm Modeling Accuracy and Efficiency in MMC-based Multi-Terminal HVDC Connection,” IEEE Trans. Power Del., vol. 32, no. 2, pp. 617-627, April 2017.
    54. L. Cai, U. Karaagac and J. Mahseredjian, “Simulation of Startup Sequence of an Offshore Wind Farm with MMC-HVDC Grid Connection,” IEEE Trans. Power Del., vol. 32, no. 2, pp. 638-646, April 2017.
    55. U. Karaagac, J. Mahseredjian, I. Kocar, G. Soykan, O. Saad, “Partial Refactorization based Machine Modeling Technique for Electromagnetic Transients,” IEEE Trans. Power Del., vol. 31, no.5, pp. 2370-2378, Oct. 2016.
    56. U. Karaagac, J. Mahseredjian and L. Cai, “Ferroresonance Conditions in Wind Parks,” Electr. Power Syst. Res., vol. 138, pp. 41-49, Sep. 2016.
    57. U. Karaagac, S.O. Faried, J. Mahseredjian and A.-A. Edris, “Coordinated Control of Wind Energy Conversion Systems for Mitigating Subsynchronous Interaction in DFIG-Based Wind Farms,” IEEE Trans. Smart Grid, vol. 5, no. 5, pp. 2440-2449, Sep. 2014.
    58. I. Kocar, J. Mahseredjian, U. Karaagac, G. Soykan and O. Saad, "Multiphase Load-Flow Solution for Large-Scale Distribution Systems Using MANA," IEEE Trans. Power Del., vol. 29, no. 2, pp. 908-915, April 2014.
    59. U. Karaagac, J. Mahseredjian, I. Kocar and O. Saad, “An efficient voltage-behind-reactance formulation based synchronous machine model for electromagnetic transients,” IEEE Trans. Power Del., vol. 28, no. 3, pp.1788-1795, July 2013.
    60. U. Karaagac, J. Mahseredjian and O. Saad, “An efficient synchronous machine model for electromagnetic transients”, IEEE Trans. Power Del., vol. 26, no. 4, pp. 2456-2465, Oct. 2011.
    61. U. Karaagac, J. Mahseredjian, O. Saad and S. Dennetière, “Synchronous machine modeling precision and efficiency in electromagnetic transients,” IEEE Trans. Power Del., vol. 26, no. 2, pp. 1072-1082, April 2011.
    EPRI (Electric Power Research Institute) Reports:
    1. System Protection Guidelines for Systems with Inverter Based Resources: Performance of Line Current Differential, Phase Comparison, Negative Sequence, Communication-Assisted, and Frequency Protection Schemes under Inverter-Based Resources and Impact of German Grid Code, Palo Alto, CA: 2019. 3002016196.
    2. Short-Circuit Phasor Models of Inverter-Based Resources for Fault Studies - Model Validation Case Studies, Palo Alto, CA: 2018, 3002013634.
    3. Protection Guidelines for Systems with High Levels of Inverter Based Resources, Palo Alto, CA: 2018. 3002013635.
    4. System Protection Guidelines for Systems with High Levels of Renewables: Impact of Wind & Solar Generation on Negative Sequence and Power Swing Protection, Palo Alto, CA: 2017. 3002010937.
    5. Short-Circuit Phasor Models of Converter Based Renewable Energy Resources for Fault Studies, Palo Alto, CA: 2017. 3002010936.
    6. Advanced Short-Circuit Modeling, Analysis and Protection Schemes Design for Systems with Renewables – TVA Case Study, Palo Alto, CA: 2017. 3002010950.
    7. Impact of Renewables on System Protection: Wind/PV Short-Circuit Phasor Model Library and Guidelines for System Protection Studies, Palo Alto, CA: 2016. 3002008367.
    8. Impact of Renewables on System Protection: Short-Circuit Phasor Models of Converter Interfaced Renewable Resources and Performance of Transmission Line Distance Protection, Palo Alto, CA: 2015. 3002005765.
    9. Impact of Renewables on System Protection: Frequency Domain Short-Circuit Models of Converter Interfaced Renewables and Guidelines for Protection Studies. EPRI, Palo Alto, CA: 2014. 3002002810.
    10. Impact of Renewables on System Protection - Wind generator models and benchmarks for short-circuit analysis. EPRI, Palo Alto, CA: 2013. 3002000347.
    IEEE-PES Task Force Report:
    • Wind SSO Task Force, Wind Energy Systems Sub-Synchronous Oscillations: Events and Modeling. Technical Report, PES-TR80, July 2020
    CIGRÉ (International Council on Large Electric Systems) Report:
    • CIGRE Working Group C4.503, Power system test cases for EMT-type simulation studies. CIGRE Technical Report, Aug. 2018

    Projects

    • Measurement-based modeling and stability analysis of voltage source converter-based power systems – Mitacs, (Canada), Hitachi ABB Power Grids (Switzerland), Réseau de Transport d'Électricité (French Transmission System Operator), Co-I, 2023-2027
    • Redefining digital twins, control, and protection strategies for reliable operation of more electronic power systems – The Hong Kong Polytechnic University, Co-I, 2022/06 - 2025/06
    • Safe protective relaying in modern transmission systems with massive power electronics-based devices – The Research Grants Council, Hong Kong, General Research Fund (GRF) Grant, PI, 2022/01 - 2025/01
    • Impact of 150 MW off-shore wind park on Hong Kong Electric Power System – Hong Kong Electric Co., Ltd, Hong Kong, Co-I, 2023/01 - 2023/12
    • Subsynchronous Interaction Problems in Power Systems with High Penetration of Power Electronics-based Devices – The Research Grants Council, Hong Kong, Early Career Scheme (ECS) Grant, PI, 2019/01 - 2022/06
    • Integration of Modular Multilevel Converter HVDC Connected Offshore Wind Farms into Power Grids – The Hong Kong Polytechnic University, Start-up Fund, PI, 2017/06 - 2022/06
    • Impact of Renewables on System Protection (e.g. Power Swing and Distance Protection) Guidelines when conducting protection studies on systems with renewables, Steady-State Short-Circuit Models of Converter Interfaced Renewables, EMTP Modeling of Renewables and Digital Relays, Validation of models with field measurements and manufacturers models – EPRI (Electric Power Research Institute), Palo Alto, CA, USA, Co-I, 2014/03 - 2019/12
    • Multi time-frame simulation of transients for large scale power systems, NSERC/Hydro-Québec/RTE/EDF/Opal-RT Industrial Chair, Montréal Polytechnique, QC, Canada, External Collaborator, 2017/01 - 2019/12
    • Developing Generic Wind Farm Models and Realistic Benchmarks for EMT-type Simulations – EMTP-RV Development Group, Montreal, QC, Canada, PI, 2016/01 - 2016/12
    • Analysis of Subsynchronous Control Interaction (SSCI) in DFIG-based Wind Farms – Senvion SE (wind turbine manufacturer, former Repower SE), Hamburg, Germany, PI, 2014/05 - 2015/07
    • Modelling and Analysis of Wind Farm Interactions with AC and HVDC Systems – German Federal Ministry for Economic Affairs and Energy & REpower SE, Germany, Leading researcher, 2012/01-2014/08
    • Development of Detailed EMT Models of REpower Wind Farms – REpower SE, Hamburg, Germany, Leading researcher, 2010/01 - 2011/12
    • Representation of space harmonics in synchronous machines – Réseau de Transport d'Électricité, Paris, France, Leading researcher, 2011/01 - 2011/12
    • Montezic Pump Storage Station Start-up Simulation Study – Réseau de Transport d'Électricité, Paris, France, Researcher, 2008/06 - 2008/12
    • Data Collection and Dynamic Studies for “Interconnection of Turkey with UCTE Project” UCTE: Union for the Coordination of Transmission of Electricity (Synchronous grid of Continental Europe) – European Union and TEIAS (Turkish Transmission System Operator), Project Manager of Turkish Technical Team, 2005/06 - 2007/09
    • Design and Implementation of Feeder Automation System for Electricity Distribution Networks (Implemented in European Side of Istanbul Distribution Network) – Bosporus Electricity Distribution Inc. (Electricity Distributor of European Side of Istanbul), Project Manager of Istanbul office, 2003/08 - 2005/06
    • Primary Frequency Control Tests and Performance Analysis of Turkish Electricity Grid Frequency, TEIAS, Project Manager, 2002/06 - 2003/08
    • Design and Implementation of Feeder Automation System for Electricity Distribution Networks – Bosporus Electricity Distribution Inc., R&D Engineer, 2001/03 - 2003/05
    • Feasibility Studies for Interconnection of Turkish Power System with Balkan Countries and UCTE System – European Union and TEIAS, Engineer, 1999/11 - 2001/02

    Supervision of PhD Students

    • Dr Tao Xue, "Safe operation of future power systems with renewables integration via AC/DC connections," The Hong Kong Polytechnic University, Hong Kong, Aug. 2024. (Chief Supervisor till resignation (Jan. 2024), then Co-Supervisor)
    • Dr Meng Lei, "EMT-type impedance scanning methods for screening control interactions between inverter-based resource and transmission grid," The Hong Kong Polytechnic University, Hong Kong, Dec. 2023. (Chief Supervisor)
    • Dr Zahid Javid, "Load flow solvers for DC and hybrid AC/DC grids," The Hong Kong Polytechnic University, Hong Kong, Nov. 2023. (Chief Supervisor)
    • Dr Abdelghafour Belqorchi , "Mesure rapide de la réponse fréquentielle à l’arrêt «F-SSFR» et saturation empirique des machines synchrones à pôles saillants," École Polytechnique, Université de Montréal, QC, CANADA, Dec. 2021. (Co-supervisor)
    • Dr Anton Stepanov , "Modeling of direct current grid equipment for the simulation and analysis of electromagnetic transients," École Polytechnique, Université de Montréal, QC, CANADA, Apr. 2020. (Co-supervisor)
    • Dr Thomas Kauffmann , "Modeling of wind parks for steady state short circuit studies," École Polytechnique, Université de Montréal, QC, CANADA, Aug. 2018. (Co-supervisor)
    • Dr Mohsen Ghafouri , "Subsynchronous resonance in DFIG-based wind farms," École Polytechnique, Université de Montréal, QC, CANADA, Apr. 2018. (Co-supervisor)

      Awards & Grants

      • 2022 Best Paper of Journal of Modern Power Systems and Clean Energy
        • Y. Chang, I. Kocar, J. Hu, U. Karaagac, K. W. Chan and J. Mahseredjian, "Coordinated Control of DFIG Converters to Comply with Reactive Current Requirements in Emerging Grid Codes," J. Mod. Power Syst. Clean Energy, vol. 10, no. 2, pp. 502-514, March 2022.
      • 2020 IEEE Power & Energy Society General Meeting Best Conference Paper on Power System Dynamics, Control, and Protection
        • A. Haddadi, I. Kocar, J. Mahseredjian, U. Karaagac, and E. Farantatos, “Performance of Phase Comparison Line Protection under Inverter-Based Resources and Impact of the German Grid Code,” 2020 IEEE PES General Meeting, Montreal, QC, Canada, 2020.
      • 2019 Best Teacher Award
        • Awarded by Electrical Engineering Department of Hong Kong Polytechnic University (based on survey among 2019 Electrical Engineering BSc graduates)
      • 2018 Best Teacher Award
        • Awarded by Electrical Engineering Department of Hong Kong Polytechnic University (based on survey among 2018 Electrical Engineering BSc graduates)

      Biography

      Ulas Karaagac received the B.Sc. and M.Sc. degrees in EEE from Middle East Technical University, Ankara, Turkey, in 1999 and 2002, respectively, and the Ph.D. degree in EE from École Polytechnique de Montréal (affiliated with Université de Montréal), Montreal, QC, Canada, in 2011. He has 25 years of diverse experience in the power engineering field across industry, academia, and major regions including North America, Asia, and Europe. In 2025, he joined the EEE Department at Middle East Technical University, where he is currently working as an Assistant Professor. His research interests include integration of large scale renewables into power grids, modeling and simulation of large-scale power systems, and power system dynamics and control.