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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.

About course offering


For course offering

Autumn 2024 Start 28 Oct 2024 programme students

Application code



For course offering

Autumn 2024 Start 28 Oct 2024 programme students


Stefan Östlund


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Course coordinator

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Headings with content from the Course syllabus EJ1200 (Autumn 2022–) are denoted with an asterisk ( )

Content and learning outcomes

Course contents

Basic concepts and problems.

Single-phase and three-phase electric circuits.

Magnetic circuits. Single-phase and three-phase transformers.

Magnetic forces. The synchronous machine.

Power electronics. Fourier analysis of currents and voltages in electric power systems. The bridge-connected DC-DC voltage converter. Single-phase and three-phase power electronic inverters.

Transmission line models. Transfer of power.

Electrical drives.

Intended learning outcomes

After passing the course, the student shall be able to

- describe the meaning of active, reactive and apparent power

- describe/explain concepts as amp-turn, flux density, flow, inductance, reluctance and magnetic energy, and carry out calculations on simple magnetic circuits

- calculate magnetic forces by means of the force law and virtual work

- describe the function of the transformer transmission lines, the synchronous machine, the bridge-connected DC-DC voltage converter, the voltage source inverter and the components of an electric drive system

- analyse three-phase systems by means of single-phase equivalent circuits, phasor diagrams, the complex method and calculate mean values, peak levels and RMS values and for simple waveforms also fundamental value and harmonics

- describe different types of nodes in an electric power system and calculate power flows in an electric power system consisting of lines and loads.

Literature and preparations

Specific prerequisites

Knowledge in electrical circuit analysis, 6 higher education credits, equivalent completed course EI1110 or EI1120.

Active participation in a course offering where the final examination is not yet reported in LADOK is considered equivalent to completion of the course. Being registered for a course counts as active participation. The term 'final examination' encompasses both the regular examination and the first re-examination.

Recommended prerequisites

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


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Examination and completion

If the course is discontinued, students may request to be examined during the following two academic years.

Grading scale

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


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

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

Opportunity to complete the requirements via supplementary examination

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Opportunity to raise an approved grade via renewed examination

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Ethical approach

  • All members of a group are responsible for the group's work.
  • In any assessment, every student shall honestly disclose any help received and sources used.
  • In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.

Further information

Course room in Canvas

Registered students find further information about the implementation of the course in the course room in Canvas. A link to the course room can be found under the tab Studies in the Personal menu at the start of the course.

Offered by

Main field of study

Electrical Engineering, Technology

Education cycle

First cycle

Add-on studies

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Stefan Östlund

Supplementary information

Replace 2C1240.

In this course, the EECS code of honor applies, see: