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  • 1. Al-Hammouri, A.T.
    et al.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Chenine, Moustafa
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Leelaruji, Rujiroj
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Virtualization of synchronized phasor measurement units within real-time simulators for smart grid applications2012In: Power and Energy Society General Meeting, 2012 IEEE, IEEE , 2012, p. 6344949-Conference paper (Refereed)
    Abstract [en]

    Synchronized phasor measurement units (PMUs) provide GPS-time tagged high-sampling rate positive-sequence voltage and current phasors. When placed in high-voltage substations in power networks, PMUs can provide real-time information that is necessary for the development of Smart Transmission Grid software applications for improving power system monitoring, control and protection. The development of these applications, particularly for use within control centers for on-line purposes, is limited by the availability of and access to real-time PMU data and other information. One attractive approach for application development is the use of real-time simulators to which PMUs can be interfaced as hardware-in-the-loop (HIL) devices to harvest PMU data. However, this approach has technical and economical limitations, which can be tackled by the virtualization of PMU devices. This article describes the development of an entirely software-based synchronized phasor measurement unit for use within real-time simulators that will allow the emulation of a large number of real-life PMUs, which in turn can be used for creating new phasor-based applications.

  • 2.
    Armendariz, Mikel
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Brodén, Daniel
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    A Method to Identify Exposed Nodes in Low Voltage Distribution Grids with High PV Penetration2015In: IEEE Power and Energy Society General Meeting 2015, Denver, CO. July 26-30, 2015. / [ed] IEEE, IEEE Press, 2015Conference paper (Refereed)
    Abstract [en]

    The impact of introducing distributed energyresources at the low voltage side of the distribution grid iscurrently raising new challenges for utilities. In particular, thehigh penetration of photovoltaic panels (PVs) in radial grids isincreasing the active power losses in the branches and thevoltage level at some of the nodes. Principally nodes next to PVarray installations. This paper presents a methodology based ondesign of experiments (DOE) to detect such exposed nodes andbranches, together with the identification of the main scenariosthat cause such problems, characterized by: season, type of day,solar radiation and outdoor temperature levels. Themethodology is simulated on a LV network based on the Cigrebenchmark Grid with real utility data. The exposed nodes areclassified for each feeder from most to least problematic andshowed (as expected) sensitivity to seasonality (summertime),characterized by high solar radiation and outdoor temperatures.

  • 3.
    Hohn, Fabian
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Directional definite-time earth fault protection based on virtual polarisation and COTS components2016In: IEEE Power and Energy Society General Meeting, IEEE, 2016Conference paper (Refereed)
    Abstract [en]

    This paper comprises the development of a directional definite-time earth fault protection based on virtual polarisation and Commercial-off-the-Shelf (COTS) components. The earth fault protection is intended to be sensitive for high-resistive and remote faults. The challenge of those type of faults is the low magnitude of the zero-sequence voltage measured at the relay location, which is often used as the polarising quantity for directional sensing. A conventional approach is to use a current transformer (CT) in the neutral-to-ground path of a wye-connected power transformer at the corresponding substation. Since this approach exposes some additional costs and efforts in terms of CT installations and engineering, a virtual polarisation approach has been implemented, which has been introduced by the IEEE Power System Relay Committee. Thus a reliable polarising quantity is gained. The platform architecture has been design based on standardised hardware and software products, considered as COTS components. This effort has been made in order to yield a cost-efficient solution as well as to reduce the time-to-market of the development process. In the end the functional performance of the protection system has been tested utilising a hardware-in-the-loop (HIL) approach.

  • 4.
    Holm, Hannes
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Sommestad, Teodor
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Ekstedt, Mathias
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Indicators of expert judgement and their significance: An empirical investigation in the area of cyber security2014In: Expert systems (Print), ISSN 0266-4720, E-ISSN 1468-0394, Vol. 3, no 4, p. 299-318Article in journal (Refereed)
    Abstract [en]

    In situations when data collection through observations is difficult to perform, the use of expert judgement can be justified. A challenge with this approach is, however, to value the credibility of different experts. A natural and state-of-the art approach is to weight the experts' judgements according to their calibration, that is, on the basis of how well their estimates of a studied event agree with actual observations of that event. However, when data collection through observations is difficult to perform, it is often also difficult to estimate the calibration of experts. As a consequence, variables thought to indicate calibration are generally used as a substitute of it in practice. This study evaluates the value of three such indicative variables: consensus, experience and self-proclamation. The significances of these variables are analysed in four surveys covering different domains in cyber security, involving a total of 271 subjects. Results show that consensus is a reasonable indicator of calibration. The mean Pearson correlation between these two variables across the four studies was 0.407. No significant correlations were found between calibration and experience or calibration and self-proclamation. However, as a side result, it was discovered that a subject that perceives itself as more knowledgeable than others likely also is more experienced.

  • 5.
    Honeth, Nicholas
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Distributed Topology Inference for Power System Applications: Algorithms and architectures utilising industry standards2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The electrical transmission and distribution system is undergoing unprecedented changes to meet the need for a carbon emission-free global energy system. An expected increase in the portion of end-user energy use in the form of electricity and need to integrate renewable energy sources into the power grid on a large scale require major changes in how power grids are operated and controlled.The systems and methods used to monitor, control and protect the power grid have developed in a context where the net power flow could be assumed to originate at large centralised power stations and be transmitted, distributed and delivered to end-users. The operation and control systems still largely follow a centralised and hierarchical structure with a control centre extending a multitude of connections out to automation systems over the geographical span of the grid. With the large-scale integration of distributed generation in the power system and the interconnection of grid infrastructures to facilitate inter-area trade of electricity, many of the premises on which traditional control systems were developed are currently changing. As more distributed generation capacity is integrated into parts of the power grid, efficient methods for determination of the electrical connectivity, the grid topology, become essential components for the development of all other control systems. The systems on which these methods are implemented must interoperate seamlessly with existing and future infrastructure. One effort to address this is an internationally coordinated standardisation process for power systems management and information exchange. The resulting standards, for example, IEC 61850 and IEC 61970, provide a framework for the development of new architectures and methods with a high level of interoperability whilst remaining applicable to the wide variety of equipment and applications that will be required. This thesis aims to test the hypothesis that distributing the application logic closer to the substation automation systems directly connected to the electrical process, provides a suitable architecture which can acquire system-wide knowledge of grid topologies without the assistance of a central entity. To achieve this, three research objectives are identified; proposing of novel control system architectures, utilising state-of-the-art structured data and equipment in substation automation systems and finally to develop a distributed topology inference algorithm utilising minimum prior knowledge of the grid it is acting within.The results firstly demonstrate the use of multi-agent systems as a distributed control and monitoring architecture. Secondly, the result demonstrates the application of relevant standardised IEC 61850 data models and interfaces for data exchange, and how they can be integrated into such architectures. Thirdly, the development of work on a multi-agent systems architecture and algorithm for distributed topology analysis of power grids is described and a formal description of the topology inference algorithm is given. Finally, a validation for the algorithm using a reference power grid model is presented.

  • 6.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Ali-Khurram, Zeeshan
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Zhao, Pengcheng
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Development of the IEC 61850-9-2 Software Merging Unit IED Test and Training Platform2013In: 2013 IEEE Grenoble Conference PowerTech, POWERTECH 2013, 2013, p. 1-6Conference paper (Refereed)
    Abstract [en]

    The IEC 61850 standard specifies a data model and communication service mapping to facilitate exchange of data and events amongst devices in a substation automation system (SAS). One of the architectural components of an IEC 61850 SAS is the process bus. The process bus is an isolated network segment used for carrying Sampled Value (SV) streams of process data and possibly GOOSE status and command signals between Merging Units (MU) and the IEDs implementing monitoring, protection and control functionality related to the connected secondary equipment. The term merging unit (MU) refers to network- enabled devices that connect to instrument transformers in the switchyard streaming packets of sampled values onto the process bus as defined in IEC 61850-9-2. This paper describes work done to develop an IEC 61850-9-2 implementation and integrate it into a testing environment which can simulate primary and secondary equipment modeled substation scenarios and provide a parametric emulation of the functionality of a MU.

  • 7.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Buschle, Markus
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Lagerström, Robert
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Sasi, K. K.
    Electrical and Electronics Engineering, Amrita University, Coimbatore India.
    Nithin, S.
    Electrical and Electronics Engineering, Amrita University, Coimbatore India.
    An Extended ArchiMate Metamodel for Microgrid Control System Architectures2012Conference paper (Refereed)
    Abstract [en]

    Management of various Distributed Energy Resources (DERs) in microgrids requires the integration of heterogeneous control devices and systems. Design and management of such integrated systems would benefit from the application of models that capture structural and functional aspects. These models are important in order to abstract the technical detail for planning and design in order to provide a basis for discussion amongst stakeholders and technical experts. Such models should provide semantics that adequately describe and define these aspects from the electro-technical to the information management perspective during design and implementation. In the discipline of IT management, Enterprise Architecture (EA) is a commonly used approach. The EA approach is typically based on metamodels with ArchiMate being one of the most well known. ArchiMate aims to enable holistic descriptions of businesses and their supporting IT using three layers, namely business, application and technology, from three perspectives, namely information, behavior and structure. While, invaluable for planning and management of large organizational IT, ArchiMate in its original form lacks the descriptive semantics required to specifically capture the high level of systems integration required for electrical process management. This paper proposes an extended ArchiMate metamodel for modeling microgrid components, the control systems, and the management and control of these integrated systems. The paper provides an example of how this can be applied to a proposed microgrid development project.

  • 8.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Distributed Topology Inference for Electric Power Grids2017In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 13, no 6, p. 3206-3215Article in journal (Refereed)
    Abstract [en]

    This paper proposes an algorithm, including a multiagent-based system architecture, for distributed inference of power grid topologies. The core algorithm is based on processing measurement time series, or fingerprints, using statistical correlation to determine the connectivity between nodes. Notably, the method and proposed system architecture is completely distributed. The solution has been developed with contemporary IEC 61850 compliant substation automation systems in mind. This paper includes a presentation of the theoretical foundation for the distributed topology inference algorithm as well as the proposed system architecture. A case study utilizing the RBTS bus 4 model is included to demonstrate the capabilities of the method under static as well as transient situations. Furthermore, the results and analysis of the performance and scalability of the algorithm are presented. The main contribution of this paper is an application to infer the electrical connectivity of power grids without central functionality.

  • 9.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Iacovella, Sandro
    Vingerhoets, Pieter
    Deconinck, Geert
    Development of a Laboratory Platform for Distributed Grid Management Applications2014Conference paper (Refereed)
    Abstract [en]

    This paper describes practical experiences in the design and implementation of a laboratory platform for developing and evaluating distributed grid management applications. The applications considered here are focused primarily on the implementation of control mechanisms for demand response of a heterogeneous portfolio of loads and distributed energy resources connected at low voltage levels. Lessons learned from the development of interfaces to various devices for integration into complex multi-host distributed control system architectures are described. Additionally, the authors provide reflections on practical aspects of building such systems and propose a set of requirements for the development of larger pilot tests.

  • 10.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Saleem, Arshad
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    A conceptual study of systems architecture for decentralised topology inference of distribution networks2013In: 22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013), 2013, p. 1-4Conference paper (Refereed)
    Abstract [en]

    Power system operation and control relies heavily on models for decision making. Determining the topology of electrical distribution networks is a critical part of producing these models and maintaining up-to-date topologies is a resource consuming and challenging task. This paper provides a conceptual study of a methodology and supporting system architecture for real time inference of electrical topology using process and model data from IEC 61850 compliant substation automation devices .The conceptual study aims to provide a discussion of the performance and scalability of such systems based on an analysis scenario. The decentralized topology inference system concept forms the basis for future work in operation and management of active distribution networks accommodating larger integration of distributed energy sources of intermittent nature.

  • 11.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Saleem, Arshad
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Process data comparison for topology inference2012In: Power and Energy Society General Meeting, 2012 IEEE, IEEE , 2012, p. 6345648-Conference paper (Refereed)
    Abstract [en]

    Power system operation and control relies heavily on models for decision making. Topology is a critical part of producing these models and maintaining up-to-date topologies of electrical distribution networks is a resource consuming and challenging task. This paper describes a methodology and system architecture for inference of electrical topology using process and model data from IEC 61850 -compliant substation automation devices. Furthermore, it examines the measurements and data handling required for such a system to work effectively. A system of autonomous intelligent agents communicating via an overlay network is described where agents are capable of communicating on the IEC 61850 station bus for collecting process data. The capabilities of structured information exchange and interfacing of substation automation devices enables plug-and-play operation of the topology inference requiring minimal prior knowledge of electrical network structure. Decentralized topology inference forms the basis for future work in operation and management of active distribution networks.

  • 12.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Saleem, Arshad
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Zhu, Kun
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Decentralized topology inference of electrical distribution networks2012In: 2012 IEEE PES Innovative Smart Grid Technologies, ISGT 2012, IEEE , 2012Conference paper (Refereed)
    Abstract [en]

    Power system operation and control relies heavily on models for decision making. Topology is a critical part of producing these models and maintaining up-to-date topologies of electrical distribution networks is a resource consuming and challenging task. This paper proposes a methodology and system architecture for inference of electrical topology using process and model data from IEC 61850 compliant substation automation devices. A system of autonomous intelligent agents communicating via an overlay network is proposed where agents are capable of communicating on the IEC 61850 station bus. An algorithm for topology inference using structured exchange and comparison of process and model information is developed. The capabilities of structured information exchange and interfacing of substation automation devices enables plug-and-play operation of the topology inference requiring minimal prior knowledge of electrical network structure. Decentralized topology inference forms the basis for future work in operation and management of active distribution networks.

  • 13.
    Honeth, Nicholas
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Yiming, Wu
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Etherden, Nicholas
    STRI AB.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Application of the IEC 61850-7-420 data model on a hybrid renewable energy system2011In: 2011 IEEE PES Trondheim PowerTech: The Power of Technology for a Sustainable Society, POWERTECH 2011, Trondheim, 2011Conference paper (Refereed)
    Abstract [en]

    IEC 61850 is the most promising standard for design of substation communication and automation systems. Recent revisions of the standard include support for modeling, and control of Distributed Energy Resources (DER). This paper presents an application of the IEC 61850-7-420 data model for DER in the implementation of a control and energy management system for a Hybrid Renewable Energy System (HRES). These systems are beginning to prove their usefulness in providing deployable electrical supply in locations where no such supply exists as well as for backup power or power quality related support functions. The motivation for applying the standard to the design process is twofold; to modularize the design according to an accepted international standard and to design for interoperability with other IEC 61850 enabled devices and SCADA systems.

  • 14.
    Hussain, Shahid
    et al.
    Blekinge Institute of Technology, Sweden.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Gustavsson, Rune
    Blekinge Institute of Technology, Sweden.
    Sandels, Claes
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Saleem, Arshad
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Trustworthy Injection/Curtailment of DER in Distribution Network Maintaining Quality of Service2011In: 16th International Conference on Intelligent System Applications to Power Systems: ISAP 2011, IEEE , 2011, p. 1-6Conference paper (Refereed)
    Abstract [en]

    Future powers system is considering huge flux of information flow due to increase in Renewable Energy Sources. Due to the limited monitoring and management of SCADA systems, inclusion of DER at local distribution level is a challenging task for the Smart Grid. We discuss the non-functional requirement aspects and their implication in trustworthy systems. The paper also illustrates an engineering approach towards trustworthy ICT systems. We present a use case about Injection/Curtailment of DER in distributed network. Further, we argue the importance of Service Level Agreements as coordination tool for information exchange between DSO and DER for the provisioning of trustworthy services. Finally conclude that modeling of SLA using Multi Agent Systems is a viable approach towards Trustworthy future Smart Grid applications.

  • 15.
    Iacovella, Sandro
    et al.
    KU Leuven, Belgium.
    Vingerhoets, Pieter
    KU Leuven, Belgium.
    Deconinck, Geert
    KU Leuven, Belgium.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Multi-Agent platform for Grid and communication impact analysis of rapidly deployed demand response algorithms2016In: Energy Conference (ENERGYCON), 2016 IEEE International, IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    Abstract:This paper describes a rapid algorithm deployment platform for Smart Grid research. Accounting for the complex interplay of power system dynamics and communication delays in the network by means of rapid code deployment during algorithm design can improve the evaluation of Smart Grid control schemes and their impact on grid power quality. Our novel approach bridges the gap between the implementation of highly realistic multi-timeframe simulations, and expensive hardwired deployment. The architecture and behavior of the platform is presented for one specific Demand Response algorithm namely Dual Decomposition. Large numbers of distributed agents are efficiently managed by employing FIPA compliant Agent Management Specification (AMS) and Directory Facilitator (DF) functionalities, as well as an efficient SQL database monitoring and logging scheme. The architecture is deployed both on an actual laboratory setup and a virtual OPAL-RT environment. Simulations results show that system latency and computational load increase linearly for increasing numbers of distributed agents. This novel approach provides a realistic and pragmatic solution for evaluating distributed applications for grid management, market applications and advanced monitoring of power quality requirements.

  • 16.
    Jalia, Aquil
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Sandels, Claes
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    A Local Market Model for Urban Residential Microgrids with Distributed Energy Resources2012In: Proceedings of the 45th Annual Hawaii International Conference on System Sciences, 2012, p. 1949-1958Conference paper (Refereed)
    Abstract [en]

    Widespread adoption of onsite distributed generation providing households with their electricity supply could make them very significant actors in terms of their aggregated impact on the wider electric power system. This paper proposes an approach which brings community engagement to the case of distributed energy resource based electricity supply for urban residential buildings. Considering a future case for Stockholm, a community ownership and service-oriented setup is proposed which fosters the creation of a market for both traditional and new stakeholders in the electric power system while ensuring the integrity of control by individual apartments. Salient features include a hypothetical pricing model which encourages local trade of electricity between apartments guided by individual apartment behavior and decision making through bid strategies. A set of research themes devoted to understanding the trends in effect of changes in the integral concept components have been identified through simulations and subjected to initial analysis.

  • 17.
    Närman, Per
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Holm, Hannes
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Ekstedt, Mathias
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Using enterprise architecture analysis and interview data to estimate service response time2013In: Journal of strategic information systems, ISSN 0963-8687, E-ISSN 1873-1198, Vol. 22, no 1, p. 70-85Article in journal (Refereed)
    Abstract [en]

    Insights into service response time is important for service-oriented architectures and service management. However, directly measuring the service response time is not always feasible or can be very costly. This paper extends an analytical modeling method which uses enterprise architecture modeling to support the analysis. The extensions consist of (i) a formalization using the Hybrid Probabilistic Relational Model formalism, (ii) an implementation in an analysis tool for enterprise architecture and (iii) a data collection approach using expert assessments collected via interviews and questionnaires. The accuracy and cost effectiveness of the method was tested empirically by comparing it with direct performance measurements of five services of a geographical information system at a Swedish utility company. The tests indicate that the proposed method can be a viable option for rapid service response time estimates when a moderate accuracy within 15% is sufficient.

  • 18.
    Närman, Per
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Holm, Hannes
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Höök, David
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Johnson, Pontus
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Using enterprise architecture and technology adoption models to predict application usage2012In: Journal of Systems and Software, ISSN 0164-1212, E-ISSN 1873-1228, Vol. 85, no 8, p. 1953-1967Article in journal (Refereed)
    Abstract [en]

    Application usage is an important parameter to consider in application portfolio management. This paper presents an enterprise architecture analysis framework which can be used to assess application usage. The framework, in the form of an architecture metamodel, incorporates variables from the previously published Technology Acceptance Model (TAM) and the Task-Technology Fit (TTF) model. The paper describes how the metamodel has been tailored for a specific domain, viz, industry maintenance management. The metamodel was tested in the maintenance management domain through a survey with 55 respondents at five companies. Data collected in the survey showed that the domain-specific metamodel is able to explain variations in maintenance management application usage. Integrating the TAM and TTF variables with an architecture metamodel allows architects to reuse research results smoothly, thereby aiding them in producing good application portfolio decision-support.

  • 19.
    Saleem, Arshad
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Gustavsson, Rune
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Interfacing Multi-agent systems in real-time control of active distribution networks2011Conference paper (Refereed)
  • 20.
    Saleem, Arshad
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    A case study of multi-agent interoperability in IEC 61850 environments2010In: IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT Europe, 2010Conference paper (Refereed)
    Abstract [en]

    The IEC 61850 is the most promising standard for design of substation communication and automation systems. On the other hand multi-agents systems are attracting growing interest for different applications of substation automation systems. In multiagent systems agents represent different stake holders in the power system and based on implemented decision making logic they determine optimal operational conditions for the power system's given boundary conditions. Interoperability is of course a necessary pre-requisite for such architectures. Here we identify two aspects of interoperability; horizontal and vertical. Horizontal interoperability is relies on common semantic models of the power system that the agents can use to make decisions. One such semantic model is presented in the IEC 61970 Common Information Model (CIM). At this level, the IEC 61850 standard provides a model for access to information and control functions that has the necessary flexibility needed. In this paper we discuss the mapping between a multi-agent based architecture for power system control and the IEC 61850 standard for utility automation. The mapping is based on a use-case drive approach, in which the information exchange need is defined by the multi-agent system.

  • 21.
    Saleem, Arshad
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Wu, Yiming
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Integrated multi-agent testbed for decentralized control of active distribution networks2013In: 2013 IEEE Power and Energy Society General Meeting (PES), IEEE , 2013, p. 6672479-Conference paper (Refereed)
    Abstract [en]

    This paper describes the development of a testbed for multi-agent based decentralized control of active distribution networks. The testbed takes into account new challenges in electric power system such as de-regulation, de-centralization, introduction of new actors, increased communication and standardization of data models and exchange. It serves the purpose of design, testing and verification of agent based distributed control and automation application development for research and education. Special considerations have been given to multi-vendor industrial compliance and standardization, e.g. IEC 61850, in the development of the testbed. The paper describes motivation for development of the platform, its architecture, components and examples of case studies that are using this testbed.

  • 22.
    Sommestad, Teodor
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Holm, Hannes
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Ekstedt, Mathias
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Quantifying the Effectivenness of Intrusion Detection Systems in Operation through Domain Experts2014In: Journal of Information System Security, ISSN 1551-0123, E-ISSN 1551-0808, Vol. 10, no 2, p. 3-35Article in journal (Refereed)
    Abstract [en]

    An intrusion detection system (IDS) is a security measure that can help system administrators in enterprise environments detect attacks made against computer networks. In order to be a good enterprise security measure, the IDS solution should be effective when it comes to making system operators aware of on-going cyber-attacks. However, it is difficult and costly to evaluate the effectiveness of IDSs by experiments or observations. This paper describes the result of an alternative approach to studying this topic. The effectiveness of 24 different IDS solution scenarios pertaining to remote arbitrary code exploits is evaluated by 165 domain experts. The respondents’ answers were then combined according to Cooke’s classical method, in which respondents are weighted based on how well they perform on a set of test questions. Results show that the single most important factor is whether either a host-based IDS, or a network-based IDS is in place. Assuming that either one or the other is in place, the most important course of action is to tune the IDS to its environment. The results also show that an updated signature database influences the effectiveness of the IDS less than if the vulnerability that is being exploited is well-known and is possible to patch or not.

  • 23.
    Välja, Margus
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicolas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Buschle, Markus
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Lagerström, Robert
    KTH, School of Electrical Engineering and Computer Science (EECS), Network and Systems Engineering.
    Sasi, Kottayil K.
    Somasundaran, Nithin
    An Archimate based analysis of Microgrid Control Systems Architectures2014Conference paper (Refereed)
    Abstract [en]

    The architectures containing embedded systems such as microgrid controllers are becoming more complex. While there are several known methodologies for embedded system modeling and design, they mostly cover development related performance issues. There exists a gap in the management of architectures implementing embedded systems for power systems applications. This paper proposes to use enterprise architecture analysis, based on earlier work, to fill that gap. Availability, interoperability and cost analysis are in focus. Enterprise architecture models are important in order to abstract the technical detail for planning and design in order to provide a basis for discussion of technical scalability and cost management amongst stakeholders and technical experts. A microgrid control architecture based example is given to illustrate the analysis possibilities.

  • 24.
    Wu, Yiming
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Shi, Zhanpeng
    ABB AB, Substn Automat Prod, Vasteras, Sweden.
    Software Merging Unit based IED Functional Test Platform2015Conference 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.

  • 25.
    Wu, Yiming
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Saleem, Arshad
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Zhu, Kun
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Armendariz, Mikel
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Perspectives on Peer-to-Peer Data Delivery Architectures for Next Generation Power Systems2013In: Smart Grid Management, 2013Conference paper (Refereed)
    Abstract [en]

    Introduction of new Information and Communication Technologies (ICT) and aggregation of equipment bring in new perspectives in terms of the increasing number of data users. It also brings new data delivery requirements which are difficult to be met by the legacy systems. Off-the-shelf standards and communication technologies are the enablers to push current data delivery solutions to a new level. At this level this new data delivery system can fulfill Quality of Service (QoS) requirements of next generation power system. This paper proposes a comprehensive architecture of Peer-to-Peer (P2P) based overlay-control data delivery system covering all levels of data delivery. The core technology of such an architecture lays on the Intelligent Substation Gateway (ISG), which is employed to provide data delivery service to meet the QoS requirements. Proposed data delivery system brings advantages as autonomy, flexibility, scalability, and efficient to the power system.

  • 26.
    Wu, Yiming
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Saleem, Arshad
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    IEC61850 Interface based Multi-agent Distribution Networks Operation and Control Architecture2013In: Smart Grid Infrastructure, 2013Conference paper (Refereed)
    Abstract [en]

    Modern Active Distribution Networks (ADN) are of distributed nature in their operation and control. Multi-agent systems (MAS) have several inherent characteristics which motivate a significant interest in their application in control and automation of ADN. Interoperability is an important consideration for both communication between agents as well as for agent to power system equipment. This paper proposes an IEC61850 interface based multiagent system architecture for distribution network operation and control. A case study is also performed to prove the proposed concept.

  • 27.
    Zhu, Kun
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Deo, Samarth
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Al-Hammouri, Ahmad
    Jordan University of Science and Technology.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Chenine, Moustafa
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Babazadeh, Davood
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Lars, Nordström
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Test platform for synchrophasor based wide-area monitoring and control applications2013In: Power and Energy Society General Meeting (PES), 2013 IEEE, Vancouver: IEEE , 2013, p. 6672308-Conference paper (Refereed)
    Abstract [en]

    Synchrophasor technology is considered as a main enabler for the envisioned Smart Grid at the transmission level. Despite some preliminary field test results reported from China Southern Grid, the majority of the synchrophasor applications are still in the engineering or advanced laboratory tests phases. One possible impedance of any real-life adoption of such applicationsis a lack of test platforms that are able to verify the proposed application paradigms in cost efficient manners, and also to demonstrate the interactions between the power system and the supporting ICT systems with sufficient details. In this paper, we report on the continuing research efforts targeting at developing a test platform for the development of the synchrophasor based applications. The platform incorporates a virtual Phasor Measurement Unit (PMU), a real-time simulator for power systems, a real-time simulator for communication networks, and an implementation of an open-source Phasor Data Concentrator. Specifically, this article focuses on the implementation and verification of the virtual PMU, and on the extension of its functionality to incorporate communication over UDP.

  • 28.
    Zhu, Kun
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Xu, Yuan
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Investigation of data exchange requirements for cooperative grid planning and operation2011Conference paper (Refereed)
    Abstract [en]

    IEC 61970 and 61968 together referred as Common Information Model (CIM), are proposed to facilitate integration of EMS applications with proprietary data formats and information exchange between control centers. To use Information and Communication Technology (ICT) systems in an optimized manner, it is necessary to partition the potentially voluminous data into subsets given their sources, expected exchange frequency, and subscribing applications. In response to these requirements, the concept of CIM profiles is brought up by CIMug. In this paper, functions illustrating the dependency between exchange data volume and basic grid parameters for each data profile are presented. A CIM/XML/RDFfile for a commonly available 40 bus test system modeled according to CIM 13 together with examples provided by standards are used as references. The method is validated by estimating the CIM/XML/RDF file sizes of similarly available 100 bus and 60 bus test systems. The contribution of this paper is that it provides ICT system designers with a means to estimate the corresponding requirements for various CIM based data exchange scenarios. The estimations are performed based on commonly known grid parameters such as number of buses, branches, generators, transformers and loads.

  • 29.
    Zhu, Kun
    et al.
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Yuan, Xu
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Honeth, Nicholas
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Nordström, Lars
    KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
    Data Volume Estimation for CIM based Information Exchange2011Conference paper (Refereed)
    Abstract [en]

    IEC 61970 and 61968, which are commonly referred as Common Information Model (CIM), are proposed to facilitate integration of EMS applications and information exchange between EMS systems with propitiatory data structures. To use communication network in an optimized manner, it is necessary to partition the potentially voluminous data into subsets given their sources, expected exchange frequency, and subscribing applications. In response to these requirements, the concept of CIM profiles is brought up by CIMug. In this paper, functions illustrating the dependency between exchange data volume and basic grid parameters for each data profile are presented. A CIM/XML/RDF file for a generally available 40 bus test system (CIM 13) and examples provided by standards are used as references. The method is validated by estimating the data sizes of similarly available 100bus and 60bus test systems that are modeled according to CIM 13 as well. The contribution of this paper is that it provides ICT system designers with a means to estimate the corresponding requirements for various CIM/XML based data exchange patterns. The estimations are performed based on commonly known grid parameters such as number of buses, branches, generators, transformers and loads together with execution frequency of particular grid planning and operation applications.

1 - 29 of 29
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