# EG2070 FACTS and HVDC in Electric Power Systems 7.5 credits

#### FACTS and HVDC in Electric Power Systems

FACTS (Flexible AC Transmission System) and HVDC (High Voltage Direct Current) are controllable devices whose functions are to enhance the security, capacity and flexibility of power transmission systems. Application of these devices in power systems implies an improvement of transient and voltage stability, power oscillation damping and optimal power flow. The course starts with a short review of some topics (relevant to this course) from power systems basic and advanced courses. Also, issues (or problems) that an electric power system may face will be discussed. Then, it will be shown that FACTS and HVDC systems may be a technical solution to these issues. It will also be discussed how these devices are designed and what functions they have. Then, basic mathematical models and control strategies will be derived based on which the impact of these devices on power system stability and damping will be analyzed.

### Offering and execution

Course offering missing for current semester as well as for previous and coming semesters

## Course information

### Content and learning outcomes

#### Course contents *

FACTS (Flexible AC Transmission System) and HVDC (High Voltage Direct Current) are controllable devices whose functions are to enhance the security, capacity and flexibility of power transmission systems. Application of these components in power systems implies an improvement of

• transient stability
• voltage stability
• damping of power oscillations
• optimal power flow

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

#### Intended learning outcomes *

To be able in a written report and orally to

• describe how FACTS and HVDC are designed,
• explain their functions and abilities,
• derive basic mathematical models for these components, and apply these models to load flow, modal analysis and transient stability analysis,
• present and apply different control strategies to these devices,
• present, describe and explain results of simulations about the impact of these devices on power system stability, and power oscillation damping
• critically analyze other related projects

#### Course Disposition

The course is given in English, and preliminary includes 14 lectures (28 h), 18 project work hours (36 h), 2 labs (8 h) and examination. During the supervising hours, the teaching assistants will be available to assist the students with the questions and preparatory work of the laboratories.

### Literature and preparations

#### Specific prerequisites *

EG2110 Power system stability and control,  EJ2300 Power electronics, also documented proficiency in English B or equivalent.

#### Recommended prerequisites

No information inserted

#### Equipment

No information inserted

#### Literature

"The Impact of FACTS and HVDC Systems on Transient Stability and Power Oscillation Damping"

M. Ghandhari, et. al

.

### Examination and completion

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

#### Examination *

• LAB1 - Laboratory Work, 1.5 credits, Grading scale: P, F
• PROJ - Project, 6.0 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.

The examination consists of a project work (home exam) and is divided into three parts: written report, oral presentation and acting as an opponent to assess one of the other project works. Furthermore, there is some compulsory progress activities, where the student will show his/her progress in the project work.

#### Other requirements for final grade *

Project (home exam), 6 (hp).
Two laboratory exercises (incl. compulsory preparatory work), 1.5 (hp).

#### Opportunity to complete the requirements via supplementary examination

No information inserted

#### Opportunity to raise an approved grade via renewed examination

No information inserted

### Further information

#### Course web

Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.

Course web EG2070

#### Offered by

EES/Electric Power Systems

#### Main field of study *

Electrical Engineering

Second cycle