Semester 5

Course: Introduction to Electric Power Systems

Course Code: ΜΚΗ7
Course Level: Undergratuate
Obligatory/Elective: Elective
Semester: 5
Division: Main Course
Group: Main Course
ECTS Credits: 6
Hours Per Week: 5
Language: Greek, English

The course consists of the following main topics:

      1. Introduction in electric Power Systems (Week 1)
        • Historical background of the evolution and structure of Electric Power Generation, Transmission and Distribution
        • The Greek Electric Power System: components, structure, special features
        • Electricity billing and Energy Markets
        • Basic operating characteristics of a Power System
      1. Basic Concepts (Weeks 2 and 3)
        • Phasors
        • Symmetric 3-phase circuits and equivalent models
        • Power flow calculation
        • Symmetric component analysis
        • Per-unit system.
      1. iii.Power plants  (Weeks 4 and 5)
        • Thermal power plants – thermal processes and power flow
        • Gas turbines-combined cycle 
        • Hydroelectric power plant 
        • Renewable Energy Sources
        • Other kind of technologies
      1. iv.Synchronous generators     (Weeks 6-8)
        • Types of modern synchronous generators, main features
        • Modeling, parameters, equivalent circuits
        • Steady state and transient operation
        • Active-reactive power control and voltage control
        • Generator synchronization on the grid
        • Power balance and losses
      1. Power Transformers (Weeks 9-11)
        • 1-phase and 3-phase transformers, equivalent circuits, structural characteristics, losses
        • Open-circuit and short-circuit experiments
        • Types of transformers (power, current and voltage, 3-winding, auto transformer)
        • Winding connection of 3-phase transformers
        • Parallel connection and voltage control
      1. vi.Lines and cables (both overhead and ubderground) of transmission and distribution grid (Weeks 12 and 13)
      • Introduction, electrical parameters
      • Equivalent model of short lines

Power flow and voltage drop in power lines

Learning Outcomes:

After successfully completing this course, students will be able to:


  • recognize the basic elements that compose a power system and understand its operation
  • analyze and perform per-unit calculations on a power system
  • describe and analyze the power generation procedure in power plants
  • compare and evaluate various kinds of power production plants (different types and technologies)
  • understand and analyze the operation of synchronous generators connected to the grid
  • understand and analyze the operation of power transformers under different winding connections
  • know the electrical characteristics of power lines and cables and apply the short-line model for power flow analysis


Teaching Methods:
Method Description Semester Workload
Lectures 26
Tutorials 26
Laboratory 13
Group projects 25
Individual study 60
Total 150

- Laboratory project assignments (30%)

- Final exams (70 %)

Suggested Books:

1. D. Labridis, P. Dokopoulos, G. Papagiannis, Electrical Power
Systems, Ziti publications, Code Eudoxos 11294.
2. N. Vovos, G. Giannakopoulos, Introduction to Electric Power
Systems, Ziti publications, Code Eudoxos 11248.
3. Vournas Constantinos, Kontaxis G., Introduction to Electric
Power Systems, Code Eudoxos 45429.

Lecturer: Christoforidis George