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Reliability Evaluation of Distribution ArchitecturesConsidering Failure Modes and Correlated Events
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-4021-839X
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Power systems are in a phase of automation where intelligent components and sub-systems are employed to monitor, control and manage the grid. Quantifying the complex consequences on system reliability, from the integration of such automated and semi-automated equipment into the existing grid is important for maintenance optimisation and fault mitigation. This thesis identifies the  advanced approaches in power system reliability analysis with the potential to capture the complications and correlations in modern power grid after reviewing the traditional reliability evaluation methods.

A method for modelling the different modes of failures, possible in a substation and feeder architecture along with the probable false tripping scenarios was developed. An improved Reliability Block Diagram based approach was designed to count in the traditionally unaccounted failure cases affecting both the primary grid and the protectionand control equipment. The effect and corresponding trend of additional feeder lines in a radial distribution system on the net interruption rate experienced at load ends of feeders are derived and modelled. Such real-world substation architectures are analysed and the aforementioned trends are compared with those from the practical grid. Thus, the analysis was able to identify and measure the complex hidden failure probabilities due to both unwanted operation of breakers and functional failure of protection systems.

The measured probabilities were used to calculate the impact of protection and control equipment on system  reliability. The obtained results were verified by comparing it with the observations by energy researchers on ten years of protection system failure statistics. The application of the model and results, in optimal maintenance planning and power network optimisation are identified as the next step.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2015. , xi, 38 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-174178OAI: oai:DiVA.org:kth-174178DiVA: diva2:858234
Presentation
2015-10-20, Q21, Osquldas väg 6B, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20151002

Available from: 2015-10-02 Created: 2015-10-01 Last updated: 2015-10-21Bibliographically approved
List of papers
1. Benefits of Reliability Centred Asset Management
Open this publication in new window or tab >>Benefits of Reliability Centred Asset Management
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2013 (English)In: 22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013), 2013, 0668- p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper provides an overview of risk and reliability assessment techniques, some which are available for distribution system operators, and others that are in the process of development. The main contribution of this paper is showing the possibilities and benefits of detailed risk and reliability analysis. Six samples of findings from research developed over the last decade within the RCAM group (Reliability Centred Asset Management) at the Royal Institute of Technology, Stockholm Sweden, are presented. The research is directly associated with risk and asset management applied to power systems. The first three examples are within developed research, followed by three areas where great potential is seen: 1) The value of accurate thermal models of transformers; 2) The impact of tariff regulation on asset management decisions; 3) Detailed interruption studies; 4) Dynamic rating; 5) Combined risk and reliability analysis of primary equipment and control equipment; 6) Systematic diagnostic measures for asset management.

Series
IET Conference Publications, Volume 2013, Issue 615
Keyword
Diagnostic measures, Distribution systems, Management decisions, Primary equipments, Reliability assessments, Risk and reliability analysis, Royal Institute of Technology, Tariff regulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-123575 (URN)10.1049/cp.2013.0668 (DOI)2-s2.0-84897619482 (Scopus ID)978-184919732-8 (ISBN)
Conference
22nd International Conference and Exhibition on Electricity Distribution, CIRED 2013; Stockholm; Sweden; 10 June 2013 through 13 June 2013
Note

QC 20130718

Available from: 2013-06-12 Created: 2013-06-12 Last updated: 2015-10-02Bibliographically approved
2. On the status of reliability studies involving primary and secondary equipment applied to power system
Open this publication in new window or tab >>On the status of reliability studies involving primary and secondary equipment applied to power system
2014 (English)In: 2014 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2014 - Conference Proceedings, IEEE , 2014, 6960653- p.Conference paper, Published paper (Refereed)
Abstract [en]

Growth in infrastructure and energy utilization consistently put forward the demand for added quality and quantity of electric power. Reliability concerns over power systems are widespread within its different associated divisions like 'primary' power system structure, protection system, control equipment, ICT (Information and Communication Technologies) etc. This paper is a review of the present status of practices regarding reliability analysis in these divisions and works towards collectively assessing some of the studies in the respective areas. The idea of integrating reliability analysis from the above areas is introduced along with pointing out the major challenges associated. A set of tools for operators to make use in these reliability evaluations and modelling are mentioned. The earlier attempts towards combined overall system reliability analysis are discussed and the approach in this regard with the help of 'control functions' is emphasised. The paper includes works dealing with theory, different methodologies and data associated with power system reliability.

Place, publisher, year, edition, pages
IEEE, 2014
Keyword
power system control, power system reliability, powr system modeling, protection system reliability, substation automation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-157937 (URN)10.1109/PMAPS.2014.6960653 (DOI)000358734100076 ()2-s2.0-84916205907 (Scopus ID)978-147993561-1 (ISBN)
Conference
2014 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2014, 7 July 2014 through 10 July 2014, Durham, United Kingdom
Note

QC 20141222

Available from: 2014-12-22 Created: 2014-12-18 Last updated: 2017-10-02Bibliographically approved
3. Reliability Data: A Review of Importance, Use, and Availability
Open this publication in new window or tab >>Reliability Data: A Review of Importance, Use, and Availability
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2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

For reliability studies of power distribution systems availability and collection of data on reliability is a key aspect. The acquirement of data can be challenging, because it endures effort and experience to know where to obtain accessible types of data. This paper gives the reader a guide to why input data to reliability analyses and asset management are useful, which data that can be obtained, and how to access the different types of data. Also, how to measure data accurately and the quality needed are discussed in the paper.

After a general discussion on the benefits of data, we discuss the importance of knowing exactly what the data are measurements of. Furthermore, we argue that data from different contexts, even if seemingly similar, should be used with care. We also state and explain that the amount data restrict the type of analysis that can be conducted. The paper continues with a description of some examples of (to different degrees) open accessible data. Nationally collected reliability data from Swedish utilities, reported to authorities and interest organizations, are described and discussed. We discuss how Swedish weather data, which recently have become free and open, enable more studies on the weather related reliability effects, and some existing test systems are mentioned. A section follows that describes how failure and condition data are typically stored and utilized internally in organizations. Finally, we conclude that the paper is a potential guide and inspiration for anyone planning to conduct a reliability study in the future.

Series
Elforsk rapport 14:32
Keyword
Asset management, DARWin, Data management, Input data, Reliability analysis, Weather Data
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-151014 (URN)
Conference
NORDAC 2014 (Eleventh Nordic Conference on Electricity Distribution System Management and Development, Stockholm, 8 - 9 September 2014)
Note

QC 20140922

Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2016-05-26Bibliographically approved
4. Reliability Evaluation of Distribution Structures Considering the Presence of False Trips
Open this publication in new window or tab >>Reliability Evaluation of Distribution Structures Considering the Presence of False Trips
2016 (English)In: IEEE Transactions on Smart Grid, ISSN 1949-3053, E-ISSN 1949-3061Article in journal (Other academic) Published
Abstract [en]

This paper presents a method for modelling the different modes of failures in a substation and feeder architecture along with updating the possible false tripping scenarios in it. A traditional approach to collectively assess the failure modes using reliability block diagram is reviewed, and the method is updated to count in the unaccounted false tripping scenarios. A generalizable radial feeder branching structure is adopted and the effect of total feeder length and number of feeders from each busbar is examined and modelled with the help of the updated reliability block diagram. The modelled trends are also studied from real-world substation architectures. Thus, the analysis attains an improved estimation of the complex hidden failure probabilities combining theoretical and practical models.

Place, publisher, year, edition, pages
IEEE, 2016
Keyword
substation protection, Circuit breakers, control equipment, failure rate modelling, power distribution faults, power system control, power system reliability
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-174183 (URN)10.1109/TSG.2016.2609684 (DOI)2-s2.0-84992090869 (Scopus ID)
Note

QC 20170220

Available from: 2015-10-01 Created: 2015-10-01 Last updated: 2017-12-01Bibliographically approved

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Babu, Sajeesh

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