Semester 5

Course: Introduction to Electric Power Systems

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

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 Results:

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:

- Lectures (powerpoint slides via projections) and tutorials

- Learning process support via e-class platform  

- Laboratory exercises 


- Laboratory project assignments (30%)

- Final exams (70 %)

Suggested Books:
  • D. Labridis, P. Dokopoulos, G. Papagiannis, Electrical Power Systems, Ziti publications, Code Eudoxos 11294. 
  • N. Vovos, G. Giannakopoulos, Introduction to Electric Power Systems, Ziti publications, Code Eudoxos 11248. 
  • Vournas Constantinos, Kontaxis G., Introduction to Electric Power Systems, Code Eudoxos 45429.
Lecturer: Christoforidis George