Course program VT 2015 2015-03-04

EI2452 Reliability Evaluation of

Electrical Power Systems (7,5 cp)
Learning Outcomes
The course aims to teach the skills of using reliability analysis as a tool for decision support for
planning and operation of electric power systems. After course completion, the participants are
expected to achieve the knowledge and skill to:

1. Describe the fundamental definitions end concepts for reliability assessment.

2. Describe the distribution grid (including the protection system) from a reliability
perspective.
3. Analyse a system using the following techniques for reliability assessment:
a) Network modelling
b) Component importance techniques
c) Markov modelling
d) Lifetime models
4. Conduct reliability calculations with tools such as NEPLAN.
5. Formulate a Life cycle cost model (LCC) and conduct investment- and risk evaluations
based on the results from reliability and LCC calculations.
6. Describe a reliability-based plan for maintenance control according to a reliability centred
maintenance (RCM) strategy and gain knowledge about reliability centred asset
management.
7. Describe the potential impact of laws and regulations on different parties within the energy
distribution sector from a reliability perspective
The learning outcomes 1-3 are tested in the second teaching periods exam. The goals 4 and 5 are
fulfilled when successfully participating in the practical laboratory sessions. The learning
outcomes 1-3, and 5-6 are also examined in an individual project assignment in the end of the
course. Outcome 7 can be part of the final project report. In addition, the students will acquire
advice and practice in reporting, reviewing, giving feedback, and doing presentations.

Course outline and activities

The workload of the course corresponds to 5 weeks fulltime studies (200 h – 7.5 hp) during period
4 (March to May) 2015. The teaching is organised in 3 course periods of 3 days each and a final
presentation session of 1 day. In particular, the course parts include the following activities:

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  Lectures presents different reliability methods and topics. The teaching focuses on the
theoretical background as well as the applicability towards power systems. The lectures
include excersie sessions and group discussions are stimulated.
 Guest lectures contain an invited speaker with an industry background who talks about
the practical viewpoint of reliability analysis. The presenter disscues the experience
gained during planning, operation, and maintenace of power systems.
 Exam tests the elementary knowledge of the methods presented in the course part 1. A
high degree of the answers has to be correctly answered to pass the exam (80% range).
A high grade in the exam will positively influence the overall grade of the course, see
section examination and grades.
 Home assignment is a written examination of knowledge from the second course part.
More information can be found in section examination and grades.
 Laboratories are practical excercises to apply the methods and tools taught in the
course. The participation in these exercises is mandatory and a written report needs to
handed in after every session. The sessions are executed in groups of two students.
 Seminar includes the oral presentation of the performed projects and their reports of
every student. The participation is mandatory, see section examination and grades.
 Conducting the project assignment: The project has to be executed individually or in
groups of two. The investigated problem should be a concrete and practical case which
could related to the students current work from a reliability analysis viewpoint. Where
applicable it is recommmended that the student select a project from his/ her
professional background, which also could result in a master thesis project or a
scientific publication. The initial project description is formulated before part 2 of the
course. The work on the project must be on a continous basis within the course parts
and in-between. The final project work will be presented in a seminar and defended
against an opponent. The project report needs to be handed in before the final seminar.
 Additional tasks (optional):
o Create excercises: Every participant has the opportunity to hand in one or more
self created excercises and solutions based on the course matierial before the
13th of may. Depending on the quality, the participant can gain up to 2 course
points extra (affecting grade).
o Identifying calculation errors in the course material and correct solution will
add 0.25 course points for each detected error and solution to the total course
points.
o Maximal 2 course points can be added to the overall course points from the two
aforementioned tasks.

Course material
The course is based on the book:
1. C. J. Wallnerström, P. Hilber, “Reliability Analysis and Asset Management Applied to
Power Distribution”, March 2014.
This book and further course matierial such as lecture and laboratory notes can be bought for
300 SEK during the course part 1 and 2. Other recommended books are presented on page 36 in
book 1. Other course relevant books are:
2. Roy Billinton and Ron Allan, “Reliability Evaluation of Power Systems”, 2nd edition.
3. Rausand, M., & Høyland, A. (2004). System reliability theory: models, statistical methods, and
applications (Vol. 396). John Wiley & Sons.
(Remark. These books are not necessary for fulfilling the course requirements.)

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Examination and Grades
Examination
To succesfully finish the course, the following requirements must be fullfilled:
 Passing of the project assignment (PRO2) of 4.5 ECTS credits, which includes:
o A passed written and oral presentation of the assignment.
o Successful participation in the laboratories and handing in the lab report.
o Participation at the seminar. This involves opposing another project assignment.
Questions have to be prepared before the seminar and a half written page of comments
on the project report must be given to the defendant.
 Examination of the course content (TEN2) of 3 ECTS credits.
The course content is examined in two parts:
o Written exam. The allowed tool during the exam is a calculator. Necessary formulas are
given in the exam instructions. Registration for the exam is mandatory and must be done
by sending an email to the course responsible jhjur@kth.se. The results are available
latest one week after the examination date.
o Home exam. All tools and resources are allowed. All sources and references except
course book 1 have to be clearly stated. The support of the teaching staff is limited to the
assistance of a normal written examination (e.g. if obvious flaws are identified,
guidelines on how to handle these will be given).
Remark. The problems in the home exam must be solved individually. Similar solutions
will be investigated. However, it is recommended to have a dialogue with other students
during the exam period. The time to solve the home exams is approximated with two
working days.

Grades
The overall grade in the course is a contexture of the grades on the different parts of the course
(supposing that all the parts have been passed). Grades are given according on the 7 step scale of
the ECTS system (e.g. A-E, pass; Fx not passed but having a possibility to upgrade without taking
the re-exam; F failed).

Maximum course points for each part are:

 Written examination 1p
 Home exam 2p
 Project assignment 3p
 Optional activities 2p

The grades are divided into the scale:

 < 1.5 E
 ≥ 1.5 D
 ≥ 2.5 C
 ≥ 4.0 B
 ≥ 5.5 A
 ≥ 7.0 A+ (a letter of recommendation will be offered)

Submission of reports
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The submission of reports and home assignments should be done directly or by e-mail to the
course responsible or a course assistant. For the submission of the matieral are the following
dates set:
 The project formulation must be formulated under course period 1 and submitted before
course period 2 or the latest on ZZZ april.
 The reports of the laboratories have to be submitted on ZZZ May for laboratory 1 and
latest on ZZZ May for laboratory 2.
 The prject reports must be submitted by ZZZ May.
 The final version of the project report must be submitted by ZZZZ June.

Deadlines
Material handed in before deadline will be evaluated within a reasonable time. This enables the
opportunity for the student to make adjustments based on the given feedback, so that the course
can be passed within the same period. Material handed in after the deadline will be evaluated
before or during the next course.

Contact information
KTH, School of Electrical Engineering, Teknikringen 33, 100 44 Stockholm.

Examiner and lecturer

Patrik Hilber, telephone 08-790 7772, e-post patrik.hilber@ee.kth.se
Course responsible
Jan Henning Jürgensen, telephone 08-790 9025, e-post jhjur@kth.se
Course assistants
Niklas Ekstedt, niklas.ekstedt@ee.kth.se
Sajeesh Babu, sbabu@kth.se
Ebrahim Shayesteh, ebrahim.shayesteh@ee.kth.se
Per Westerlund, perw@kth.se

Course information
Course webpage: http://www.kth.se/student/kurser/kurs/EI2452?l=en

Course Feedback
After the students have successfully conducted the course parts and the project assignement,
constructive feedback is welcome. Therefore, short feedback questionaries are provided after the
course. These include questions such as: What parts of the course were well executed and what
could be done better (sorry no coffee will be available)? Did you learn new things and could that
be applied to your (expected) profession? Suggestions on how to improve the course etc.

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Schedule
The preliminary schedule for all course parts is presented in the following tables. The tables
show the code, the lecture content, lecturer, rooms, time, and day. The code shows the type of
session: lectures (F), guest lectures (F), exercise (Ö), laboratories (Lab), exams (TEN), and
seminar (SEM). Lecturer names are abbreviated with: Patrik Hilber (PH), Per Westerlund (PW),
Sajeesh Babu (SB), Niklas Ekstedt (NE), Jan Henning Jürgensen (JHJ), and Ebrahim Shayesteh
(ES). The course rooms are all at the KTH Teknikringen 33, Stockholm: H21 Seminarierummet
(H21), Alvenlaboratoriets seminarierum (AL), and studentrummet/datorsalen (DS).
Course period 1:
Code Content Lecturer Room Time Day
F1a Course Introduction JHJ, Alla H21 10-11 Tu 24
March
F1b Introduction to the field of reliability PH H21 11-12 Tu 24
analysis March
F2 Failure models NE H21 13-15 Tu 24
March
F3 Introduction to markov models NE H21 15-17 Tu 24
March
F4 Methods for power system analysis ES H21 8-10 Wed 25
March
F5 Risk and vulnerability analysis ES or H21 10-12 Wed 25
JHJ March
F6 Markov models NE H21 13-15 Wed 25
March
Ö1 Exercise Alla H21 15-17 Wed 25
March
F7 Approximative methods for system PH H21 8-10 Thu 26
analysis March
F8 Methods for analysis of the power grid ES H21 10-12 Thu 26
and stations 13-14 March
Ö2, Lab Defining and preparing the project and SB, Alla H21 14-15 Thu 26
the laboratory March

Own work between course period 1 and 2: formulation of the project assignment
Course period 2:
Code Content Lecturer Room Time Day
F9 Guest lecture: Reglering av kvalitet i Olle H21 10-12 Tue 21
elnätsverksamheten, kvalitetsbegreppet, Hansson April
styrmedel och dess tillämpning,
företagsperspektivet, Olle Hansson,
Fortum Distribution
TEN1 Exam All H21 13-15 Tue 21
April
F10 Combined analysis of Primary and SB H21 15-17 Tue 21
Secondary systems: Overview April
F11 Methods for reliability importance PH H21 8-10 Wed 22
April
F12 FELIN, Ekstedt’s Tool JHJ, NE, H21 10-12 Wed 22
SB April
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F13 Guest lecture: Alla H21 13-14 Wed 22
Energimarknadsinspektionen, April
Karin Alvehag
F14 Presentation of problem descriptions PH, H21 14-16 Wed 22
students April
Ö3 Solution to the exam SB H21 8-9 Thu 23
April
F15 Economical Analysis, Introduction JHJ H21 9-11 Thu 23
April
Lab1 Laboratory part 1 : Reliability analysis SB H21 11-12 Thu 23
of the power grid - Introduction April
Lab1 Laboratory part 1 : Reliability analysis SB, JHJ DS 13- Thu 23
forts. of the power grid : NEPLAN exercise ca 16 April

Own work between course period 2 and 3: work with project assignement.

Course period 3:
Code Content Lecturer Room Time Day
F16 Methods for reliability centred PH H21 10-12 Tue 5
maintenance May
F17 Lifetime analysis NE H21 13-15 Tue 5
May
Ö4 Theory recap Alla H21 15-17 Tue 5
May
F18 Cost- and LCC-analysis JHJ AL 8-10 Wed 6
May
Ö4 Exercise, arbete med projektuppgift Alla AL 10-12 Wed 6
May
Lab2 Laboratory part 2: LCC-analysis for the JHJ AL 13-17 Wed 6
power grid with an example of a actual May
case studywithin RCAM
F19 Introduction to Monte Carlo simulations ES H21 8-10 Thu 7
May
F20 Gästföreläsning: Driftsäkerhets-statistik Matz H21 10-12 Thu 7
för distribution och regionnät - Tapper May
uppföljningsystem och erfarenhetsdata -
Matz Tapper Svensk Energi
Ö5 eller Övning, arbete med projektuppgift eller Alla H21 13-15 Thu 7
omtenta omtentamen vid behov (kl 13-15) May

Home assignment: 16-20 maj

Own work before the last seminar: finishing the project report and preparing for the oral
presenteation and defence

Seminar:
SEM Seminar: oral presentation and defence All H21 10-16 Wed
of the project report 27
May
Important dates: Examination and presentation of the project
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Code Content Lecturer Room Time Day
TEN1 – Written examination All H21 10-12 21
normal April
TEN1 – Re-exam – second opportunity to All H21 12-14 7 May
Re-exam succesfully pass the written examination.
TEN2 Home assignment Alla H21 n/a 5-7
May
SEM Seminar: oral presentation and defence All H21 10-16 Wed
of the project report 27
May

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