IRE35017 Power Electronics and Network Protection (Autumn 2017)

The course is connected to the following study programs

Compulsory course in Bachelor of Engineering, Study Programme: Electronics, Power Engineering.

Prerequisites

It is recommended the student has passed the courses Electrical Circuits, Electronics, Management and Control Design, Electrical systems and equipment, or equivalent.

Lecture Semester

5. semester (fall)

The student's learning outcomes after completing the course

Knowledge:

The student

• understands fundamentals in Power Electronics
• will acquire knowledge of theory, mathematical models and simulation models applied to power semiconductors, power electronic circuits and their applications
• has theoretical basis to perform short circuit analysis in high voltage power systems
• is able to calculate the tripping levels of relay's protection in high voltage network with limited complexity

Skills:

The student

• can perform calculations on power electronic circuits with ideal components
• can perform failure analysis based on symmetrical components

General competence:

The student

• is capable to understand and evaluate the basic behavior of different components, circuits and topologies of power electronics converters (DC-DC, DC-AC, AC-AC and AC-DC
• understands the principals of relay protection planning
• understands the characteristics of different types of relay protection for power systems, both in networks as well as for major components of energy supply
• has gained expertise in writing technical reports
• is familiar with different international notation and how to use technical manuals in the subject

Content

 The following topics will be covered:

• Power Electronic Components
• Generic bridge circuits for rectifiers and inverters
• Power supplies
• Frequency Converters
• Harmonic currents on the grid / EMC
• Regulation and control of power electronic systems
• Transients of electrical machines during short circuit
• Calculation of short-circuit currents based on impedance method, according to IEC 60 090
• Symmetrical components
• Different types of grounding in power systems, residual current, impedance grounding
• Instrument Transformers
• Types of relay protection, behavior and tripping functions
• Overcurrent relay, differential protection, Impedance relays, special protection for electric machines

Forms of teaching and learning

The course consists of lectures, exercises and laboratory exercises. Parts of or the whole subject may be given as an online lesson combined with videoconferencing.

Coursework requirements - conditions for taking the exam

• Laboratory exercises with the submission of a report (group work)
• Exercises with written submission

In the beginning of the course further information will be given as to the number of compulsory exercises required.

Examination

5 hours written exam.

Examinations will be formed in two separate parts, each of which covers the topics of power electronics and short-circuit analysis / relay protection. To pass the exam, the candidate must have answered both parts satisfactorily

Aids: Issued hereinafter. Formula sheet prepared in consultation with the class. Approved calculator.

The grades A to F, where A is the highest grade and F is fail.

Course evaluation

Continuous evaluation of the teaching during the semester in which evaluation method agreed between the teacher (s) and students.

Written final evaluation of the course.

Literature

Mohan, N., Underland, T.M., Robbins, W.P., Power Electronics, Third Edition. ISBN 0-471-42908-2

Network Protection and Automation Guide (can be downloaded from the Alstoms website).

Handouts and compendium.

Additional literature:

Alfredsson, A., Jacobsson, K. A. (2016), Elkrafthandboken: Elmaskiner och elektriska drivsystem, Liber forlag, 478 s.