smart grid technology for distribution system reliability improvement

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Faculty of Engineering, Kasetsart University

Mr.Wirote BuakleeSeptember 29, 2012

SMART GRID TECHNOLOGY FOR 

DISTRIBUTION SYSTEM RELIABILITY 

IMPROVEMENT

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Selected Paper

[1] Zhou Xue-song,Cui Li-qiang and Ma You-jie,  “Research on Smart Grid

Technology” , IEEE International Conference on Computer Applicationand System Modeling (ICCASM 2010), 2010.

[2] D. M. Staszesky, D. Craig, C. Befus, “Advance Feeder Automation isHere”, IEEE Power and Energy Magazine, September/October 2005,pp. 56-63.

[3] M. Fotuhi –Firuzabad, R. Billinton,T.S Munian and B.Vinayagam, “ANovel Approach to Determine Minimal Tie-Sets of Complex Network”,IEEE Trans. On Reliability, Vol.53, No.1, March 2004.

[4] H. Hajian-Hoseinabadi, “Impacts of Automated Control Systems onSubstation Reliability” IEEE Trans. On Power Delivery, Vol.26, No.3,

July 2011.[5] H. Hajian-Hoseinabadi, M. Hasanianfar, and M. Esmail Hamedani

Golshan, “Quantitative Reliability Assessment of Various AutomatedIndustrial Substations and Their Impacts on Distribution Reliability” IEEE Trans. On Power Delivery, Vol.27, No.3, July 2012.

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Presentation Topics

I. Definition of Smart Grid

II. Smart Grid Technology

III. Automation System

IV. Reliability Assessment of Substation Automation System

 V. Impact of SAS on Substation and Distribution Reliability

 VI. Future Research

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I. Definition of Smart Grid

 America: to address the aging of the distributionnetwork, improve service levels, and enhance userinteraction.

Europe: to promote renewable energy use, so that thepower industry meets the efficient, flexible,environmentally friendly and conducive to market-oriented and other requirements

China: to achieve optimal allocation of grid resource andto achieve "plug and play" distributed powerapplications, and the popularity of smart meters.

“No uniform definition” about smart grid in the word. The

focus of the development of smart grid also varies.

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I. Definition of Smart Grid

Thailand(PEA): เปนโครงขายไฟฟาท ใช  เทคโนโลยสารสนเทศ และส   อสารมาบรหารจัดการ ควบคมการผลตส งและจายพลังงานไฟฟา สามารถรองรับการเช   อมตอระบบไฟฟาจากแหลงพลังงานทางเลอกท สะอาดท กระจายอย 

ทั วไป การใช  รถยนตไฟฟาและระบบบรหารการใช  ส  นทรัพยให เกดประโยชนสงสด รวมทังใหบรการกับผเช   อมตอกับโครงขายผานมเตอรอัจฉรยะไดอยางมประส  ทธภาพ มความมั นคง ปลอดภัย เช   อถ อได ม ค ณภาพไฟฟาได

มาตรฐานสากล

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• Advanced technologies for reliability improvement

• Ease of Control and Management

• Integrating of Distributed Energy Resources

• Supporting Demand Response

 “SMART GRID” a conventional electric power systemthat has been equipped with …

I. Definition of Smart Grid

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Main Features of Smart Grid

Self-HealingOptimization

Interactive

Compatibility

Strong

Integration

Smart

Grid

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Existing Power Grid and Smart Grid

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II. Smart Grid Technology

Advanced

Metering

Infrastructure

(AMI)smart meters, wide-

area network facilities,home networking …

Smart Grid

Advanced

Distribution

Operation (ADO)...• Advanced Distribution

Automation

• Substation Automation

• Feeder Automation

Advanced AssetManagement

(AAM)equipment asset

management, defect

management,

maintenancemanagement…

..

Advanced

Transmission

Operation (ATO)Advanced grid

monitoring, wide-area

measurement systems,

state detection…

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III. Automation System

Example of Outage restoration

without and with automation

To Enhance

System Reliability

By Reducing

•number of interruption

•Service interruption time

•Area affected by the fault

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Why Automation?

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IV. Reliability Assessment of Substation Automation System (SAS)

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Reliability Evaluation Technique

• Conditional Probability Approach

• Cut-Set Method

• Tie-Set(path) Methodology

• Event Tree Method

• Fault Tree Analysis(FTA)

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Cut-Set Method

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input

input

Output

Output

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Tie-Set(Path) Method

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Output

Output

input

input

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Fault Tree Approach (FTA)

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Event Tree Approach (ETA)

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Main Control Function Main Control Action

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RBD Concept

NCCS - Network Control CenterServer

PSU - Power Supply UnitHMI - Human Machine InterfaceSTR - Star CouplerOPT - Optical ConnectionBCU - Bay Control UnitSCSS - Substation Control

System Server

Minimum Tie-Set Method

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Concept of Reliability Assessment

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Reliability Evaluation Procedure

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2. Calculate “failure rate” and “Outage time” of each loadpoint when component outage by using condition probabilitytheory and restoration time probability as follow:

Failure rate:

Outage time:

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 V. Impact of SAS on Substation andDistribution Reliability

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Impact of SAS on Substation Reliability

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• Substation Automation System Architectures

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Impact of SAS on Substation Reliability

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Impact of SAS on Substation Reliability

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Impact of SAS on Substation Reliability

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•Case Studies

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Impact of SAS on Substation Reliability

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•Study Results

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Impact of SAS on Substation Reliability

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•Study Results

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Impact of SAS on Substation Reliability

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•Conclusion#1:

Applying SAS can reduce annual down time

range from 0.05% to 23.19% compare with no

automation system.

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Impact of SAS on Substation Reliability

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•Conclusion#2:

Failure rate index has not been influenced

by SAS when AST is more than 5 min.

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Impact of SAS on Distribution Reliability

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•Study Results

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Impact of SAS on Distribution Reliability

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•Study Results

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Impact of SAS on Distribution Reliability

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•Conclusion#1

Reduce MST can improve reliability indices

17.3% 17.4%

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Impact of SAS on Distribution Reliability

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•Conclusion#2

SAIFI has not been influenced by SASwhen AST is more than 5 min.

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Impact of SAS on Distribution Reliability

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•Conclusion#3

SAIFI and AENS have significantly improved

by SAS when AST is less than 5 min.

21%89%

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Impact of SAS on Distribution Reliability

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•Conclusion#4

Redundant star architecture of SAS has ahigher degree of distribution reliability

improvement

17.1%12.5%

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 VI. Future Research

 Apply the concept of Substation Automation System toFeeder Automation System

 Apply the methodology of reliability evaluation in SAS toFAS to improve overall distribution reliability

Centralized and Decentralized Automation System for FASshould be taken into account

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