EJ1200 Electric Power Systems 6.0 credits


The course deals with theory, methods, and components for systems where conversion and transmission of electric power are the main objectives. Examples of such systems are speed-controlled drives for electric vehicles and industrial robots, and wind power plants interacting with the utility grid.

  • Education cycle

    First cycle
  • Main field of study

    Electrical Engineering
  • Grading scale

    A, B, C, D, E, FX, F

Course offerings

Intended learning outcomes

When the student has passed the course, the student should:

  • know active, reactive and apparent power.
  • be able to calculate mean values, peak values, rms-values, and harmonics.
  • be able to analyse three phase systems using single phase equivalent circuits, phasor diagrams, and jw-method.
  • be able to describe different nodes in a power system.
  • be able to calculate transmission of power in power systems.
  • be able to do calculations on magnetic circuits.
  • be able to calculate magnetic forces by using the law of magnetic force, virtual work, and Maxwell’s tensions.
  • describe rotating magnetic fields
  • describe the function of the transformer, transmission lines, synchronous machine, one- and three-phase power electronic converters.
  • by using the jw-method, equivalent circuits and phasor diagrams, be able to analyse transformer, transmission lines, synchronous machine, and one- and three-phase power electronic converters.

Course main content

Fundamental concepts and problem areas. Single-phase and three-phase power, transmission line models. Transmission of power. Ferro-magnetic circuits.The transformer. Magnetic forces. The synchronous machine. Single-phase and three-phase power electronic inverters. Electrical drives.


Basic requirements to study at Swedish universities including Swedish B and english A or equivalent.

Recommended prerequisites

Basic courses of the first two years in the Electrical Engineering programme.
Electromagnetic Field Theory E, 10,5 hp (EI1200), Electrical Circuit Analysis, expanded course, 9,0 hp (EI1100), Continuous TimeSignals and Systems, 6 hp EQ1100.




  • LABD - Laboratory work, 0.5, grading scale: P, F
  • LABE - Laboratory work, 0.5, grading scale: P, F
  • LABF - Laboratory work, 0.5, grading scale: P, F
  • TEN2 - Written exam, 4.5, grading scale: A, B, C, D, E, FX, F

Offered by

EECS/Electrical Energy Engineering


Stefan Östlund


Stefan Östlund <stefano@kth.se>

Supplementary information

Replace 2C1240


Course syllabus valid from: Spring 2019.
Examination information valid from: Autumn 2019.