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Every autumn semester

The demand for electrical energy is still increasing. To keep the high grade of reliability of electrical distribution and also make it more economic and environmentally friendly, there are many projects going on: Renewable production of electric energy is installed and the international trade is increasing. Increased capacity of the transmission system is achieved by advanced supervision and control instead of the expensive building of new transmission lines. Higher utilization of the power system requires better understanding not only of the function of the separate components, and also of the characteristics of the whole system. The course is meant to give knowledge about systems for production, transmission and distribution of electric energy under normal and abnormal conditions. The power blackout on a national level is used as a thematic example throughout the course.

The course presents the structure and characteristics or the electric power system, which are lectured and studied in classroom and computer exercises and practical tests within the laboratory work. In industry, computer calculations are used for the analyses of international power systems. This type of calculations is part of the course, as well as calculations by hand, used to enhance the understanding of the computerized calculations.

The course has relevance for an environmentally sustainable development: Electric energy is the most important form of energy for our prosperity. The course teaches how the power system works and can be controlled as effectively as possible and thereby minimize our energy consumption.

Construction and function of key components. Power electronic control and compensation;
System representation: Single line diagram. Symmetrical components. Per unit normalization. Short-circuit MVA;
System characteristics during normal operation, short-circuits, asymmetry and resonance. Angle and voltage stability. Computer dynamic simulations and load flow calculations. Control of voltage, frequency, active and reactive power. Relay protection;
Study visit.

be able to formulate simple models of an electric power system for computation of load flow and symmetric and asymmetric fault currents;
be able to describe the calculation process of a computer programme for the calculation of load flow;
be able to calculate symmetric and asymmetric fault currents for a simple model of an electric power system;
be able to formulate stability criteria for a simple power system model;
understand the meaning of selectivity for a relay protection system.

be able to carry out computer calculations of fault currents, stability, and load flow for non-trivial power system models;
be able to evaluate computer calculations of fault currents, stability, and load flow by hand calculations.

show insight into the possibilities and limitations of the electric power system and its role in society.

Lectures

Laboratory exercises

Exercises

Study visit

Written exam

Written exam (5h) of problem solving mixed with theory questions.

Failed, pass

ESS060, ESSF15 Electrical Engineering or MIE012, EIEF35 Electrical Engineering, basic course, or ETE115, EITF90 Electromagnetics and electronics.

Glover, D, J. & Sarma: Power System Analysis and Design, (International Edition (4th)).. Cengage Learning, 2007. ISBN 9780495295969.

EIEN15F

2021-06-24

Professor Thomas Johansson