# 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 to the system is considered through real-life scenarios. The course focuses on steady-state, symmetrical, and normal (no faults) operation.

## 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 numerically the power flow 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.

## Prerequisites

The following course knowledge are prerequisites for this course:

- Engineering mathematics (advanced mathematics I-III, linear algebra)
- Physics I-III
- Electric circuit analysis I&II
- Control systems

## Syllabus

The course consists of these parts:

- Introduction to electric power systems (basic functionality, generation-transmission-distribution structure, load consumption)
- Single-phase and three-phase AC circuits (complex power, power factor, reactive power compensation, Y-$\Delta$ transformation)
- 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)
- The power transformer (Ampere and Faraday laws, basic principles, ideal and real transformer model, single- and three-phase transformer models, three-phase transformer configuration)
- Introduction to rotating machines (fundamentals of electromechanical conversion)
- Synchronous machine (fundamentals, EMF, power/torque, equivalent circuit, generator/motor operation)
- Induction machine (fundamentals, power/torque, slip, generator/motor operation)
- The transmission line characteristics (design and parameter derivation, $\Pi$-model, line approximations)

## Course books

- 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

## Delivery

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)
- Three-phase circuits and
- Single-phase power transformer
- Three-phase power transformer
- Power-factor correction

- Monday and Tuesday 08:30-10:30 (Zoom platform)

## Assessment

Assessment type | % of grade |
---|---|

Mid-term exam | 20 |

Lab exam | 20 |

Final exam | 60 |