Power systems II

This course extends into the field of electric power systems based on the course EEN320. It focuses on the use of computational methods for the analysis of electric power systems in steady-state as well as during symmetrical and asymmetrical faults. It proceeds to provide the fundamental understanding of protection devices operation and selection.

Learning outcome

On completion of this course, students should be able to:

  • Understand the fundamental computational methods to analyze the steady-state and under-fault operation of electric power systems;
  • Understand and analyze the basic power transfer limits in electric power systems; and,
  • Understand the fundamentals of protection devices and protection selection.


  1. Revision of power engineering fundamentals (per-unit, line/transformer/generator/load models)
  2. Fundamentals of power system operation (Surge impedance loading, lossless line, efficiency, loadability, maximum power over line, P-δ and P-V characteristics, Ferranti effect)
  3. Power flow analysis (nodal admittance matrix, NR-method, fast decoupled, DC power flow)
  4. Unbalanced operation (symmetrical components)
  5. Fault analysis (modeling line/transformer/generator during fault, solid faults)
  6. Protection fundamentals (fundamentals, structure, overcurrent, distance, differential, digital relays)

Course books

  • A. Gómez-Expósito, A. J. Conejo, and C. A. Canizares, Electric Energy Systems Analysis and Operation, 2nd edition, CRC Press, 2018.
  • D. Glover, M. S. Sarma and T. Overbye, Power System Analysis & Design, 6th edition, Cengage Learning, 2017.
  • Nasser Tleis, Power Systems Modelling and Fault Analysis : Theory and Practice, 2nd edition, Academic Press, 2019.
  • Ν. Βοβός, Γ. Γιαννακόπουλος, “Ανάλυση Συστημάτων Ηλεκτρικής Ενέργειας”, Β’ έκδοση, εκδόσεις ΖΗΤΗ, 2019


Due to special circumstances, this year the course is following a blended learning schedule with 2 hours in person + 1 hours online. This might be modified according to the requirements and the regulations.

  • Theory delivered through lectures (in class ≈ 26 hours)
  • Practical examples (online ≈ 12 hours)
  • Hardware laboratory work (in lab ≈ 8 hours)
    1. Three-Phase AC Power Circuits: Connection, system familiarization, Wye-Delta connections, power measurements.
    2. Power Factor Correction: Power factor and power factor correction.
    3. AC / DC Motors and Generators: Connection and familiarization, losses and efficiency.

Time and place

  • (Group A) Tuesdays 17:00-19:00 (Amohostos room)
  • (Group B) Tuesdays 19:00-21:00 (Amohostos room)
  • (ALL) Thursdays 11:00-12:00 (Zoom Room)
Group AGroup B


Assessment type% of grade
Hardware laboratory report with short oral exam on the report30
Mini project30
Final exam40