Skip to main content

EG2121 FACTS and HVDC in Electric Power Systems 7.5 credits

The course starts with a review of static and dynamic issues in power systems. Then FACTS and HVDC are presented and it is shown how these components may be a technical solution to the described issues. It will be discussed in the course how FACTS and HVDC are designed and also what functions they have. Basic mathematical models and control strategies are presented and used to analyze the impact of theses components on power system stability.

Choose semester and course offering

Choose semester and course offering to see current information and more about the course, such as course syllabus, study period, and application information.


For course offering

Spring 2025 Start 17 Mar 2025 programme students

Application code


Headings with content from the Course syllabus EG2121 (Autumn 2022–) are denoted with an asterisk ( )

Content and learning outcomes

Course contents

FACTS (Flexible AC Transmission System) and HVDC (High Voltage Direct Current) transmission are power electronics-based devices whose functions are to enhance the capacity, security and flexibility of power transmission systems. Application of these devices to power systems implies an enhancement of transient and voltage stability, increase of power oscillation damping (POD) and improvement of power flow under normal operations or post-fault conditions. The course presents basic mathematical models and control strategies for being able to analyse, how these devices affect power system stability. Most part of the analysis is dedicated to POD which is the main topic of this course. A part of the course shows how one uses the most important functions in the necessary software.

Intended learning outcomes

After passing the course, the student shall be able to

1. create basic mathematical models for controllable devices (FACTS and HVDC) and apply different control strategies to these controllable devices

2. regulate voltages and power flow in electric power systems on the basis of these mathematical models and control strategies

3. both orally and in writing present and explain the results of a project in which the impact of controllable devices on power system stability and damping will be analysed.

Literature and preparations

Specific prerequisites

Knowledge in stability and dynamics of electric power system, 7.5 higher education credits, equivalent to completed course EG2110.

Knowledge in power electronics, 6,0 higher education credits, equivalent to completed course EJ2301.

Recommended prerequisites

No information inserted


No information inserted


No information inserted

Examination and completion

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

Grading scale

P, F


  • PRO1 - Projet work, 7.5 credits, grading scale: P, 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

No information inserted

Opportunity to raise an approved grade via renewed examination

No information inserted


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

Education cycle

Second cycle

Add-on studies

No information inserted

Supplementary information

The course responsible evaluates all applicants to the course. Please contact course responsible before admitting any student to the course