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Publications (10 of 17) Show all publications
Yiming, W., Nordström, L., Wang, Y. & Hauser, C. (2018). Adaptive Cyber-Security Scheme Incorporating QoS Requirements for WAMC Applications. In: Power Systems Computation Conference (PSCC2018): . Paper presented at 20th Power Systems Computation Conference (PSCC2018), 11th-15th June 2018, Dublin, Ireland. IEEE conference proceedings
Open this publication in new window or tab >>Adaptive Cyber-Security Scheme Incorporating QoS Requirements for WAMC Applications
2018 (English)In: Power Systems Computation Conference (PSCC2018), IEEE conference proceedings, 2018Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE conference proceedings, 2018
Keywords
Adaptive Scheme, Cyber-Security, Quality of Service, Stateful Data Delivery Service, WAMC
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-230616 (URN)000447282400215 ()
Conference
20th Power Systems Computation Conference (PSCC2018), 11th-15th June 2018, Dublin, Ireland
Note

QC 2018-06-25

Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2019-02-07Bibliographically approved
Yiming, W., Xiao, Y., Hohn, F., Nordström, L., Wang, J. & Zhao, W. (2018). Bad Data Detection Using Linear WLS and Sampled Values in Digital Substations. IEEE Transactions on Power Delivery, 33(1), 150-157, Article ID 7867789.
Open this publication in new window or tab >>Bad Data Detection Using Linear WLS and Sampled Values in Digital Substations
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2018 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 33, no 1, p. 150-157, article id 7867789Article in journal (Refereed) Published
Abstract [en]

Smart Grids employ intelligent control applications that require high quality data: fast, secure, and error free. Several researchers have focused on providing techniques for low latency and secured data links for these applications. Bad data detection is however generally provided only at the central level due to limitations in legacy technologies employed in many substations. With the introduction of IEC61850 data sharing within the substation becomes more flexible and transparent allowing more sophisticated management of data quality. Hence, this paper proposes a substation level bad data detection algorithm to facilitate also these types of requirements from applications. The algorithm is based on automatically detecting the substation topology by parsing standard substation description files and online state of circuit breakers and disconnectors. By applying linear weighted least square based state estimation algorithm, bad data from failing current transformers (CT) can be detected. By conducting the verification of different types of bad data, the results show the output of bad data detection algorithm provides higher accuracy than output from both measurement and protective CT in both static and faulty situations.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Keywords
bad data detection, digital substation, Linear WLS, process bus, sampled values
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-222247 (URN)10.1109/TPWRD.2017.2669110 (DOI)000423091100016 ()2-s2.0-85041035552 (Scopus ID)
Note

QC 20180205

Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2019-09-18Bibliographically approved
Wu, Y. & Nordström, L. (2016). Adaptive data link configuration for WAMC applications using a Stateful Data Delivery Service platform. Sustainable Energy, Grids and Networks, 6, 166-175
Open this publication in new window or tab >>Adaptive data link configuration for WAMC applications using a Stateful Data Delivery Service platform
2016 (English)In: Sustainable Energy, Grids and Networks, ISSN 0284-4354, E-ISSN 2352-4677, Vol. 6, p. 166-175Article in journal (Refereed) Published
Abstract [en]

Wide Area Monitoring and Control (WAMC) applications provide, among other things, stability control to power systems by using global measurements. However, these measurements suffer unavoidable Quality of Service (QoS) problems, such as delay, during the transmission through a wide area communication network. Such delays potentially lead to failure of the control application. To overcome these effects, mechanisms that provide robustness to QoS problems for control applications and configuration of communication networks to optimize QoS performance have been proposed by several researchers. To optimize utilization of the communication infrastructure and to adapt to variations in QoS, applications can benefit from an interface to request and obtain QoS information from a managed communication infrastructure. To meet this need, a novel Stateful Data Delivery Service (SDDS) for WAMC applications is proposed in this paper. The SDDS monitors the QoS performance online and provides feedback to one or more WAMC applications. To increase reliability of the applications, the SDDS also provides adaptive data link configuration services. By using online QoS measurements and multiple data sources, the SDDS platform can provide a WAMC application with data fulfilling its requirements. To prove the concept, a case study has been performed and the results of this study show that the application using the SDDS can keep a benchmark power system stable even when original data link QoS performance does not meet the application's requirements. The paper also contains a presentation of the SDDS prototype platform under development as a part of the ongoing research.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Adaptive data link configuration, POD, QoS, Stateful Data Delivery Service, WAMC applications
National Category
Computer Systems
Identifiers
urn:nbn:se:kth:diva-186944 (URN)10.1016/j.segan.2016.04.001 (DOI)000377407500017 ()2-s2.0-84963856938 (Scopus ID)
Note

QC 20160524

Available from: 2016-05-24 Created: 2016-05-16 Last updated: 2019-02-07Bibliographically approved
Yiming, W., Babazadeh, D. & Nordström, L. (2016). Modeling of Communication Infrastructure Compatible to Nordic 32 Power System. In: IEEE-Power-and-Energy-Society General Meeting 2016: . Paper presented at IEEE PES GM 2016. IEEE
Open this publication in new window or tab >>Modeling of Communication Infrastructure Compatible to Nordic 32 Power System
2016 (English)In: IEEE-Power-and-Energy-Society General Meeting 2016, IEEE, 2016Conference paper, Published paper (Refereed)
Abstract [en]

Smart Grid integrates communication and computationtechnologies into power systems. Research on interdisciplinarytopics between power system and communicationsystems requires models for both systems. There are severalpower system models available representing standard powersystems and real power systems. However, lacking of theircorresponding communication infrastructure information leadsthe difficulty of communication system modeling. In this paper,a communication infrastructure model compatible to Nordic 32power system model has been developed and presented. In thismodel, Wide Area Monitoring System (WAMS) is incorporatedwith Supervisor Control and Data Acquisition system. Theparameters of this model are based on the data from a Nordicelectric power utility. Validation of the model is performedthrough comparison of results from simulation and a previousempirical data study performed on the same utility network. Inadditional, this model is simulated by using different Qualityof Service (QoS) mechanism. The obtained results show thatcongestion management mechanisms introduce additional delayto the highest priority traffic slightly. But traffics with lowerpriority can be benefit from congestion management mechanisms.The proposed model can be widely used for other research onNordic 32 power system.

Place, publisher, year, edition, pages
IEEE, 2016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-178167 (URN)10.1109/PESGM.2016.7741521 (DOI)000399937901161 ()2-s2.0-85001959389 (Scopus ID)
Conference
IEEE PES GM 2016
Note

QC 20170313

Available from: 2015-12-07 Created: 2015-12-07 Last updated: 2019-02-07Bibliographically approved
Bian, D., Kuzlu, M., Pipattanasomporn, M., Rahman, S. & Wu, Y. (2015). Real-time Co-simulation Platform using OPAL-RT and OPNET for Analyzing Smart Grid Performance. In: 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING: . Paper presented at General Meeting of the IEEE-Power-and-Energy-Society, JUL 26-30, 2015, Denver, CO. IEEE
Open this publication in new window or tab >>Real-time Co-simulation Platform using OPAL-RT and OPNET for Analyzing Smart Grid Performance
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2015 (English)In: 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, IEEE , 2015Conference paper, Published paper (Refereed)
Abstract [en]

The objective of this paper is to present a real-time co-simulation platform for analyzing electric power grid operation, taking into account integrated communication systems. This paper discusses how a co-simulation platform can be set up using OPNET and OPAL-RT as communication and power system simulators, respectively. A simplified distribution automation case study is demonstrated to show how the cosimulation platform can be used to analyze performance of the smart grid operation in real-time.

Place, publisher, year, edition, pages
IEEE, 2015
Series
IEEE Power and Energy Society General Meeting PESGM, ISSN 1944-9925
Keywords
real-time, co-simulation, Java Eclipse, OPNET, RTLAB, OPAL-RT, System-in-the-Loop, smart grid applications
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-184575 (URN)10.1109/PESGM.2015.7286238 (DOI)000371397502157 ()2-s2.0-84956853725 (Scopus ID)978-1-4673-8040-9 (ISBN)
Conference
General Meeting of the IEEE-Power-and-Energy-Society, JUL 26-30, 2015, Denver, CO
Note

QC 20160405

Available from: 2016-04-05 Created: 2016-04-01 Last updated: 2016-04-05Bibliographically approved
Wu, Y., Honeth, N., Nordström, L. & Shi, Z. (2015). Software Merging Unit based IED Functional Test Platform. In: : . Paper presented at 2015 IEEE Power & Energy Society General Meeting, July 26-30, 2015, Denver, CO, USA. IEEE
Open this publication in new window or tab >>Software Merging Unit based IED Functional Test Platform
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In Substation Automation Systems, application functions such as monitoring, control, and protection are deployed in intelligent electronic devices (IEDs). Before the IEDs are installed in the substation, functions are tested by the manufactures to ensure that the functions operate properly as designed. A conventional function test platform is made of amplifiers with copper wire connection to the IEDs. It has drawbacks such as high cost, limited flexibility, and limited number of signal channels. With the introduction of the IEC61850 standard, IEDs are able to obtain measurement from merging units (MU) via the process bus. Consequently, using MUs to replace the amplifier for IED function testing has been studied by several research groups. All of them use hardware MUs or power system simulator embedded MUs. These MUs based test platforms have weakness such as limitation of the number of MUs and lower flexibility in MU performance modification, This paper proposes a novel IED functional test platform using software MU (sMU), which mitigates the above limitations. Thanks to the software approach, different MU performance scenarios can be easily configured instead of using a complicated communications simulator. The sMU based test platform concept has been proved by performing accuracy and operate-time tests with transformer differential protection. Comparing with conventional test platform, sMU based test platform has better results in the accuracy tests and similar performance in the operate-time tests. Therefore, it is feasible to use sMU based platform for IED functional tests.

Place, publisher, year, edition, pages
IEEE, 2015
Series
IEEE Power and Energy Society General Meeting PESGM, ISSN 1944-9925
National Category
Communication Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-163718 (URN)10.1109/PESGM.2015.7285783 (DOI)000371397500187 ()2-s2.0-84956853557 (Scopus ID)978-1-4673-8040-9 (ISBN)
Conference
2015 IEEE Power & Energy Society General Meeting, July 26-30, 2015, Denver, CO, USA
Note

QC 20150413

Available from: 2015-04-10 Created: 2015-04-10 Last updated: 2016-04-04Bibliographically approved
Chenine, M., Ullberg, J., Nordström, L., Wu, Y. & Ericsson, G. (2014). A Framework for Wide-Area Monitoring and Control Systems Interoperability and Cybersecurity Analysis. IEEE Transactions on Power Delivery, 29(2), 633-641
Open this publication in new window or tab >>A Framework for Wide-Area Monitoring and Control Systems Interoperability and Cybersecurity Analysis
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2014 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 29, no 2, p. 633-641Article in journal (Refereed) Published
Abstract [en]

Wide-area monitoring and control (WAMC) systems are the next-generation operational-management systems for electric power systems. The main purpose of such systems is to provide high resolution real-time situational awareness in order to improve the operation of the power system by detecting and responding to fast evolving phenomenon in power systems. From an information and communication technology (ICT) perspective, the nonfunctional qualities of these systems are increasingly becoming important and there is a need to evaluate and analyze the factors that impact these nonfunctional qualities. Enterprise architecture methods, which capture properties of ICT systems in architecture models and use these models as a basis for analysis and decision making, are a promising approach to meet these challenges. This paper presents a quantitative architecture analysis method for the study of WAMC ICT architectures focusing primarily on the inter-operability and cybersecurity aspects.

Keywords
Communication systems, cybersecurity, enterprise architecture analysis, interoperability, wide-area monitoring and control systems (WAMCS)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - ICT; SRA - Energy
Identifiers
urn:nbn:se:kth:diva-118342 (URN)10.1109/TPWRD.2013.2279182 (DOI)000333523000017 ()2-s2.0-84897379296 (Scopus ID)
Funder
StandUp
Note

QC 20140508. Updated from submitted to published.

Available from: 2013-02-15 Created: 2013-02-15 Last updated: 2017-12-06Bibliographically approved
Nordström, L., Zhu, K. & Wu, Y. (2014). A Multi-Disciplinary Course Portfolio on Computer Applications in Power Systems. IEEE Transactions on Power Systems, 29(4), 1919-1927
Open this publication in new window or tab >>A Multi-Disciplinary Course Portfolio on Computer Applications in Power Systems
2014 (English)In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 29, no 4, p. 1919-1927Article in journal (Refereed) Published
Abstract [en]

As a response to the new requirements posed by the shift towards Smartgrids, there have been many initiatives worldwide to develop and update power engineering education curricula. This paper reports efforts to develop courses with the purpose to cross the gap between the disciplines of power engineering and information communication technology at KTH-the Royal Institute of Technology in Sweden. The course portfolio is engineered to complement several master programs offered by the university, and the intended audience are students and practitioners both with and without the power engineering background. This paper primarily focuses on details of a keystone course, Computer Applications in Power Systems, and its connection with the other courses in the portfolio. To prove the popularity and relevance of the reported course portfolio, increasingly positive feedback from students, recognition from industry partners, and accomplishments in terms of meeting several strategic goals in education set by the IEEE Power & Energy Society are also reported by this paper.

Keywords
Course development, information communication technology, power engineering education, Smartgrids
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-139390 (URN)10.1109/TPWRS.2014.2302735 (DOI)000338189600048 ()2-s2.0-84903310876 (Scopus ID)
Note

QC 20140806

Available from: 2014-01-10 Created: 2014-01-10 Last updated: 2017-12-06Bibliographically approved
Wu, Y., Saleem, A. & Nordström, L. (2014). IEC61850 Logical Node Lookup Service Using Distributed Hash Tables. In: 2014 IEEE PES Innovative Smart Grid Technologies Conference, ISGT 2014: . Paper presented at 2014 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2014, Washington, DC, United States, 19 February 2014 through 22 February 2014 (pp. 6816443). IEEE Computer Society
Open this publication in new window or tab >>IEC61850 Logical Node Lookup Service Using Distributed Hash Tables
2014 (English)In: 2014 IEEE PES Innovative Smart Grid Technologies Conference, ISGT 2014, IEEE Computer Society, 2014, p. 6816443-Conference paper, Published paper (Refereed)
Abstract [en]

Development of Information and Communication Technology (ICT) increases the communication capability of equipment in power system and also creates large number of data sources. In order to reliably share these data sources with applications is a new challenge for power system. This paper presents an alternate data delivery system solution using IEC61850 standard Manufactory Messaging Specification (MMS) across wide area networks, utilizing Distributed Hash Table (DHT) for look-up of Logical Nodes addresses.  Result of the proposed scheme is a flexible, autonomous, scalable, and robust method to address Logical Nodes across a Wide Area Network. In comparison with IEC61850-90-2 solution, this solution can help reduce the manual work in configuration of each link, and enables greater flexibility for adding new data points. The presented platform also opens door of providing adaptive data acquisition for power system applications by implementing a filtering function in the ISG.

Place, publisher, year, edition, pages
IEEE Computer Society, 2014
Keywords
MMS, Distributed Harsh Table, IEC61850, DataDelivery Systems, Hardware In the Loop
National Category
Communication Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-136773 (URN)10.1109/ISGT.2014.6816443 (DOI)000355408800069 ()2-s2.0-84901920729 (Scopus ID)978-147993652-6 (ISBN)
Conference
2014 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2014, Washington, DC, United States, 19 February 2014 through 22 February 2014
Funder
StandUp
Note

QC 20150626

Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2015-06-26Bibliographically approved
Wu, Y., Babazadeh, D. & Nordström, L. (2014). Stateful Data Delivery Service for Wide Area Monitoring and Control Applications. In: Proceedings of the International Conference on Dependable Systems and Networks: . Paper presented at 44th Annual IEEE/IFIP International Conference on Dependable Systems and Networks, DSN 2014; Atlanta; United States (pp. 768-773).
Open this publication in new window or tab >>Stateful Data Delivery Service for Wide Area Monitoring and Control Applications
2014 (English)In: Proceedings of the International Conference on Dependable Systems and Networks, 2014, p. 768-773Conference paper, Published paper (Refereed)
Abstract [en]

Recent Information and Communication Technology (ICT) advances have enabled power system applications using measurement signals across the Wide Area Network (WAN). The application control performance relies on the quality of data delivery service. However, the characteristics of Quality of Service (QoS), such as latency, packet loss, and packet jitter, are unavoidable. It is a trend to take QoS metric requirement into the consideration of controller design. But, how to ensure the application receiving the data within the designed tolerant range is another challenge. This paper presents ongoing work on a novel Stateful Data Delivery Service (SDDS) for power system application to address the challenge from the side of the communication infrastructure. The SDDS monitors the QoS performance on-line and identifies the signals which satisfy the requirement for the application to use. As a proof of concept, a Power Oscillation Damping (POD) controller is connected to the SDDS. The result shows the improvement in robustness of the POD controller by application of the SDDS. The paper also shows the feasibility of applying SDDS to WAC applications.

Keywords
Overlay Network, Power Oscillation Damping, Quality of Service, Robustness, Stateful Data Delivery Service
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-144897 (URN)10.1109/DSN.2014.80 (DOI)2-s2.0-84912073060 (Scopus ID)978-147992233-8 (ISBN)
Conference
44th Annual IEEE/IFIP International Conference on Dependable Systems and Networks, DSN 2014; Atlanta; United States
Note

QC 20150127

Available from: 2014-05-02 Created: 2014-05-02 Last updated: 2015-01-27Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6330-3055

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