Power systems I

This course covers the fundamentals of power system modeling, structure, and basic characteristics. It helps the students to understand the functional characteristics and to develop models for component-level as well as system-level analysis. The basic power system components, such as synchronous machines, transmission lines, transformers, and loads, are analyzed and their impact on the system is considered through real-life scenarios. The course focuses on steady-state, symmetrical, and normal (no-fault) operation.

Meet your instructor

Petros Aristidou

Learning outcome

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

  • Explain the basic operation of electric power systems for generation, transmission and distribution, and consumption;
  • Explain the basic principles and the functionality of the basic components in a power system (buses, transmission lines, transformers, AC electric machines);
  • Be able to analyze the power flow numerically in small systems using common power system models and methodologies;
  • Appreciate, through basic case studies, the technical challenges in both the design and the operation of power systems.


The following course knowledge is prerequisites for this course:

  1. Engineering mathematics (advanced mathematics I-III, linear algebra)
  2. Physics I-III
  3. Electric circuit analysis I&II
  4. Control systems


The course consists of these parts:

  1. Introduction to electric power systems (basic functionality, generation-transmission-distribution structure, load consumption)
  2. Single-phase and three-phase AC circuits (complex power, power factor, reactive power compensation, Y-$\Delta$ transformation)
  3. The per-phase and per-unit system representation (one-line diagram, benefits of pu, base value selection, single- and three-phase pu, base system conversion)
  4. The power transformer (Ampere and Faraday laws, basic principles, ideal and real transformer model, single- and three-phase transformer models, three-phase transformer configuration)
  5. Introduction to rotating machines (fundamentals of electromechanical conversion)
  6. Synchronous machine (fundamentals, EMF, power/torque, equivalent circuit, generator/motor operation)
  7. Induction machine (fundamentals, power/torque, slip, generator/motor operation)
  8. The transmission line characteristics (design and parameter derivation, $\Pi$-model, line approximations)


  • Chapman, S.J., “Electric machinery fundamentals”, 4th edition McGraw-Hill, 2005
  • D. Glover, M. S. Sarma and T. Overbye, “Power System Analysis & Design”, 6th edition, Cengage Learning, 2017
  • Κ. Βουρνάς, Γ. Κονταξής, “Εισαγωγή στα συστήματα ηλεκτρικής ενέργειας”, εκδόσεις ΣΥΜΜΕΤΡΙΑ, 2010


Due to special circumstances, this year the lectures are taking place online. This might be modified according to the requirements and the regulations.

  • Theory delivered through lectures (in class ≈ 30 hours)
  • Practical examples (online ≈ 12 hours)
  • Hardware laboratory work (in lab ≈ 8 hours)
    1. Three-phase circuits
    2. Single-phase power transformer
    3. Three-phase power transformer
    4. Power-factor correction
  • Moodle Link


Assessment type% of grade
Mid-term exam20
Lab exam20
Final exam60