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  • 1.
    Al Karim, Miftah
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Synchrophasor-based data mining for power system fault analysis2012Inngår i: Innovative Smart Grid Technologies (ISGT Europe), 2012 3rd IEEE PES International Conference and Exhibition on, IEEE , 2012, s. 6465843-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor measurement units can provide high resolution and synchronized power system data, which can be effectively utilized for the implementation of data mining techniques. Data mining, based on pattern recognition algorithms can be of significant help for power system analysis, as high definition data is often complex to comprehend. In this paper three pattern recognition algorithms are applied to perform the data mining tasks. The deployment is carried out firstly for fault data classification, secondly for checking which faults are occurring more frequently and thirdly for identifying the root cause of a fault by clustering the parameters behind each scenario. For such purposes three algorithms are chosen, k-Nearest Neighbor, Naïve Bayes and the k-means Clustering.

  • 2.
    Babazadeh, Davood
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Real-Time Smart Grid Application Testing using OPNET SITL2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor -based Wide Area Monitoring and Control (WAMC) system promise to improve the monitoring of power grid across large geographic areas and accordingly controlling grid in more efficient and intelligent ways. In order to have confidence on the correctness, performance and reliability of applications used in WAMC system in real world scenarios, pseudo-real test beds where the requirements for the applications and their supporting Information and Communication Technology (ICT) can be quantified and analyzed. In this paper, a WAMC system testing platform is proposed to facilitate the real-time simulation of dynamic power grid, the ICT infrastructure that overlays the grid and WAMC applications. The proposed platform consists of OPNET as a powerful communication network simulator connected to real-time power system simulator on one side through virtualized Phasor Measurement Unit device, and linked to end point stations such as Phasor Data Concentrator or application on the other side through OPNET’s real-simulation gateway. A set of proof of concept scenarios using this framework is presented.

  • 3.
    Björkman, Gunnar
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sommestad, Teodor
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Hadeli, Hadeli
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    SCADA system architectures2010Annet (Annet vitenskapelig)
    Abstract [en]

    The aim of deliverable 2.3 in the VIKING is to catalogue architecture patterns or reference architectures, i.e. commonly deployed solutions, for SCADA systems. These patterns are represented as a set of descriptions that capture the vast majority of SCADA systems’ architecture on a high level. The patterns developed in this report focus on: - Software services in SCADA systems and software services which SCADA systems exchange data with. - Data flows among these services. - How services are placed in different security zones (network zones). The purpose of the SCADA architecture patterns is to clarify how SCADA systems are commonly designed by employing a stringent model framework. Internal in the project the SCADA patterns will be used to develop SCADA system design models that reflect some typical systems deployed in industry. These models will be used in other work packages and deliverables in the VIKING project.

  • 4.
    Bottura, Riccardo
    et al.
    Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna.
    Babazadeh, Davood
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Borghetti, Alberto
    Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nucci, Carlo Alberto
    Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna.
    SITL and HLA Co-simulation Platforms: Tools for Analysis of the Integrated ICT and Electric Power System2013Inngår i: 2013 IEEE EUROCON, 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Due to the necessity of developing analysis tools inthe integrated ICT and power system domain, this paperdescribes and compares the architecture and configuration oftwo different co-simulation approaches called SITL and HLACo-simulation platforms. We provide several details on theirimplementation and present their features by means of theresults obtained for two test cases. The paper aims at clarifyingthe type of analysis that can be effectively carried out by usingthe two different platforms. Both platforms make use of thecommunication network simulator OPNET (Optimum NetworkPerformance). One of the two platforms operates in real time, inorder to perform system-in-the-loop (SITL) simulations. Theother platform is based on the interface between OPNET and thepower network simulation environment EMTP (ElectromagneticTransient Program). The interface is based on the application ofthe High-Level Architecture (HLA) standard.

  • 5.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Survey on Priorities and Communication Requirements for PMU-based Applications in the Nordic Region2009Inngår i: 2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the Electrical Grid of the Future, IEEE , 2009, s. 1183-1190Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor based Wide Area Monitoring and Control Systems (WAMC) promise to offer more accurate and timely data on the state of the power system, thus, increasing the possibilities to manage the system at a more efficient and responsive level and apply wide area control and protection schemes. This paper presents results of a survey on communications and technical requirements for applications based on Phasor Measurement Units (PMU). The survey was carried out in the Nordic Region with participants from Transmission System Operators (TSOs) and researchers. The survey focused on documenting the stage of research and development among TSOs and researchers in the Nordic Region, as well as, their plans and visions for the future. This includes planned PMU deployments and prioritization of PMU based applications. Furthermore, a significant part of the survey was an elicitation of communication requirements for applications based on PMU data. In the paper, an examination of the time requirements for these applications in terms of delays and samples per second and comparison similar published specifications is provided.

  • 6.
    Franke, Ulrik
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ericsson, Evelina
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Rocha Flores, Waldo
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture analysis using Fault Trees and MODAF2009Inngår i: Proceedings of the Forum at the CAiSE 2009 Conference, 2009, Vol. 453, s. 61-66Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Analysis of dependencies between information systems, business processes, and strategic goals is an important part of the discipline of Enterprise Architecture (EA). However, EA models typically provide only visual and qualitative decision support. This paper shows how EA frameworks for dependency analysis can be extended into the realm of quantitative methods by the use of techniques from Fault Tree Analysis (FTA). Using MODAF, the UK Ministry of Defence Architecture Framework as an example, we give a list of criteria for the extraction of a metamodel for FTA use, and provide such a metamodel for MODAF. Furthermore, we use this MODAF FTA metamodel to perform dependency analysis on a sample MODAF model.

  • 7.
    Han, Xue
    et al.
    Technical University of Denmark (DTU), Denmark.
    Sandels, Claes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Kun, Zhu
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Modelling Framework and the Quantitative Analysis of Distributed Energy Resources in Future Distribution Networks2013Inngår i: International Journal of Emerging Electric Power Systems, ISSN 2194-5756, E-ISSN 1553-779X, Vol. 14, nr 5, s. 421-431Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There has been a large body of statements claiming that the large-scale deployment of Distributed Energy Resources (DERs) could eventually reshape the future distribution grid operation in numerous ways. Thus, it is necessary to introduce a framework to measure to what extent the power system operation will be changed by various parameters of DERs. This article proposed a modelling framework for an overview analysis on the correlation between DERs. Furthermore, to validate the framework, the authors described the reference models of different categories of DERs with their unique characteristics, comprising distributed generation, active demand and electric vehicles. Subsequently, quantitative analysis was made on the basis of the current and envisioned DER deployment scenarios proposed for Sweden. Simulations are performed in two typical distribution network models for four seasons. The simulation results show that in general the DER deployment brings in the possibilities to reduce the power losses and voltage drops by compensating power from the local generation and optimizing the local load profiles.

  • 8.
    Han, Xue
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sandels, Claes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Söderström, Peter
    Vattenfall AB, Sweden.
    Empirical analysis for Distributed Energy Resources' impact on future distribution network2012Inngår i: Energy Conference and Exhibition (ENERGYCON), 2012 IEEE International, IEEE , 2012, s. 731-737Konferansepaper (Fagfellevurdert)
    Abstract [en]

    There has been a large body of statements claiming that the large scale deployment of Distributed Energy Resources (DERs) will eventually reshape the future distribution grid operation in various ways. Thus, it is interesting to introduce a platform to interpret to what extent the power system operation will be alternated. In this paper, quantitative results in terms of how the future distribution grid will be changed by the deployment of distributed generation, active demand and electric vehicles, are presented. The analysis is based on the conditions for both a radial and a meshed distribution network. The input parameters are based on the current and envisioned DER deployment scenarios proposed for Sweden.

  • 9.
    Honeth, Nicholas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Saleem, Arshad
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Vanfretti, Luigi
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Decentralized topology inference of electrical distribution networks2012Inngår i: 2012 IEEE PES Innovative Smart Grid Technologies, ISGT 2012, IEEE , 2012Konferansepaper (Fagfellevurdert)
    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.

  • 10.
    König, Johan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Mapping the Substation Configuration Language of IEC 61850 to ArchiMate2010Inngår i: Proceedings - IEEE International Enterprise Distributed Object Computing Workshop, EDOC, IEEE , 2010, s. 60-68Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a mapping between the Enterprise Architecture framework ArchiMate and the Substation Configuration Language (SCL) of IEC 61850. Enterprise Architecture (EA) is a discipline for managing an enterprise's information system portfolio in relation to the supported business. Metamodels, descriptive models on how to model and one of the core components of EA, can assist stakeholders in many ways, for example in decision-making. Moreover, the power industry is a domain with an augmented reliance on the support of information systems. IEC 61850 is a standard for the design of Substation Automation (SA) systems and provides a vendor independent framework for interoperability by defining communication networks and functions. The SCL is a descriptive language in IEC 61850 on the configuration of substation Intelligent Electronic Devices (IED) which describes the structure together with physical components and their relating functions. By using SCL, which models the architecture of SA systems, and mapping it to ArchiMate, stakeholders are assisted in understanding their SA system and its architecture. The mapping is intended to support the integration of SA systems applying IEC 61850 into the enterprise architecture. The mapping is demonstrated with an example applying the mapping to a SA configuration based on SCL.

  • 11.
    Nordström, Lars
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Vanfretti, Luigi
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Information and communication system architectures for wide-area monitoring and control applications2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a review of work performed in the field of communication systems requirements for wide area monitoring and control applications. This includes studies performed both in the context of NASPI, the North American Syncrophasor Initiative, as well as other studies in the US and Europe. Presently a relatively large body of work has been done regarding the requirements on the communication infrastructure. Among the work included, are surveys among Transmission System Operators on the foreseen communication requirements, as well as other theoretical studies on acceptable delays and other performance characteristics, such as data loss, that Wide Area Control applications put on the Information and Communication System. Much of the above referenced work still needs verification either though experimental work or through simulations. It is especially important to simulate large scale communication infrastructures that consider background traffic under different operational conditions in the power system, such as under disturbances. The paper is concluded with some remarks on future direction of work within the field.

  • 12.
    Wu, Yiming
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Saleem, Arshad
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Honeth, Nicholas
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Armendariz, Mikel
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Perspectives on Peer-to-Peer Data Delivery Architectures for Next Generation Power Systems2013Inngår i: Smart Grid Management, 2013Konferansepaper (Fagfellevurdert)
    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.

  • 13.
    Wu, Yiming
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Framework incorporating synchronized phasor data for power system operation and control2012Inngår i: The 9th IET International Conference on Advances in Power System Control, Operation and Management, Institution of Engineering and Technology, 2012, Vol. 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This position paper presents initial research and investigation on a unified framework combining two independent systems, the legacy SCADA system and the synchronized phasor data system, that share the same measurement sources, i.e., current and voltage transducers and the same communication medium. In this framework, conventional SCADA system coupled with substation automation system are modeled together with synchronized phasor systems. The contribution of this paper also includes a state-of–the-art survey of topics related to the proposed architectures. Furthermore, an overview of the data flows between substation and control centers including both SCADA and phasor measurements are presented. Taking into consideration the growing interest in communication and automation standardization this paper also addresses the communication between the substations coupled with relevant standards and technology.

  • 14.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Data Quality in Wide-Area Monitoring and Control Systems: PMU Data Latency, Completness, and Design of Wide-Area Damping Systems2013Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The strain on modern electrical power system operation has led to an ever increasing utilization of new Information Communication Technology (ICT) systems to enhance the reliability and efficiency of grid operation. Among these proposals, Phasor Measurement Unit (PMU)-based Wide-Area Monitoring and Control (WAMC) systems have been recognized as one of the enablers of “Smart Grid”, particularly at the transmission level, due to their capability to improve the real-time situational awareness of the grid. These systems differ from the conventional Supervisory Control And Data Acquisition (SCADA) systems in that they provide globally synchronized measurements at high resolutions. On the other hand, the WAMC systems also impose several stringent requirements on the underlying ICT systems, including performance, security, and availability, etc. As a result, the functionality of the WAMC applications is heavily, but not exclusively, dependent on the capabilities of the underlying ICT systems. This tight coupling makes it difficult to fully exploit the benefits of the synchrophasor technology without the proper design and configuration of ICT systems to support the WAMC applications. The strain on modern electrical power system operation has led to an ever increasing utilization of new Information Communication Technology (ICT) systems to enhance the reliability and efficiency of grid operation. Among these proposals, Phasor Measurement Unit (PMU)-based Wide-Area Monitoring and Control (WAMC) systems have been recognized as one of the enablers of “Smart Grid”, particularly at the transmission level, due to their capability to improve the real-time situational awareness of the grid. These systems differ from the conventional Supervisory Control And Data Acquisition (SCADA) systems in that they provide globally synchronized measurements at high resolutions. On the other hand, the WAMC systems also impose several stringent requirements on the underlying ICT systems, including performance, security, and availability, etc. As a result, the functionality of the WAMC applications is heavily, but not exclusively, dependent on the capabilities of the underlying ICT systems. This tight coupling makes it difficult to fully exploit the benefits of the synchrophasor technology without the proper design and configuration of ICT systems to support the WAMC applications.

    In response to the above challenges, this thesis addresses the dependence of WAMC applications on the underlying ICT systems. Specifically, two of the WAMC system data quality attributes, latency and completeness, are examined together with their effects on a typical WAMC application, PMU-based wide-area damping systems. The outcomes of this research include quantified results in the form of PMU communication delays and data frame losses, and probability distributions that can model the PMU communication delays. Moreover, design requirements are determined for the wide-area damping systems, and three different delay-robust designs for this WAMC application are validated based on the above results. Finally, a virtual PMU is developed to perform power system and communication network co-simulations.

    The results reported by this thesis offer a prospect for better predictions of the performance of the supporting ICT systems in terms of PMU data latency and completeness. These results can be further used to design and optimize the WAMC applications and their underlying ICT systems in an integrated manner. This thesis also contributes a systematic approach to design the wide-area damping system considering the PMU data latency and completeness. Finally, the developed virtual PMU, as part of a co-simulation platform, provides a means to investigate the dependence of WAMC applications on the capabilities of the underlying ICT systems in a cost-efficient manner.

  • 15.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Al-Hammouri, A. T.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    To concentrate or not to concentrate: Performance analysis of ICT system with data concentrations for Wide-area Monitoring and Control Systems2012Inngår i: Power and Energy Society General Meeting, 2012 IEEE, IEEE , 2012, s. 6344977-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Timely and synchronized phasor data at high resolutions holds great promise for more responsible and advanced power grid operations. It is expected that combined effort of developing new application paradigms and the supporting Information and Communication Technology (ICT) will enable the miracle of Smart Grid at the transmission level. This paper addresses the design of the supporting ICT system for Wide Area Monitoring and Control applications from the performance perspective. The major contribution that distinguishes this paper from previous research efforts in the same area is that this study quantifies the end-to-end data delay with consideration of different levels of data concentrations. The analysis performed in this paper is not limited to the delay caused by individual ICT components but also provides means to view and analyze the delay of the entire supporting ICT system. Moreover, the quantified delay results drawn in this paper will potentially provide valuable input to the discussion on the coming standards for synchronized phasor measurements.

  • 16.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Babazadeh, Davood
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Wu, Yiming
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Design of Robust Wide-Area Damping Controller Based on Synchronized Phasor2012Inngår i: The 9th International Conference on Advances in Power System Control, Operation & Management (APSCOM 2012), 18 November-21 November 2012, Kowloon Shangri-La Hotel, Hong Kong: Conference Handbook, Hongkong: Institution of Engineering and Technology, 2012Konferansepaper (Fagfellevurdert)
  • 17.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Analysis of data quality issues in wide area monitoring and control systems2010Inngår i: 2010 IREP Symposium - Bulk Power System Dynamics and Control - VIII, IREP2010, Rio de Janeiro, 2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Synchronized phasor measurement based Wide Area Monitoring and Control (WAMC) system is becoming a reality with international research and development both in academia and industry. Timely and accurate data with high resolutions holds great promise for more responsible and advanced grid control and operation. Currently, most of the research focuses on the different control schemes and applications. A relatively less addressed aspect is the dependency of the WAMC system on the performance of the Information and Communication Technology (ICT) infrastructure, without whose support the projected functionalities of the WAMC systems will not be achieved. Possible input delay brought by the complex data transfer and processing processes in WAMC systems are presented at the beginning of this paper. Thereafter, simulations where delayed phasor measurements are fed to a typical WAMC application - Static Var Compensation (SVC) are conducted iteratively to detect its maximum tolerated delay. Based on this maximum tolerated delay, the consequences of missing certain data in the phaor packets have been studied. Furthermore, data quality requirements to design a reliable SVC function are analyzed based on simulation results. In conjunction with the requirement discussion, the paper is concluded by proposing a robust ICT architecture to mitigate the aforementioned data quality issues.

  • 18.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Data quality and reliability aspects of ICT infrastructures for Wide Area Monitoring and Control Systems2010Inngår i: 2010 5th International Conference on Critical Infrastructure, CRIS 2010, Beijing, 2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Synchronized phasor measurement based Wide Area Monitoring and Control (WAMC) system is becoming a reality within international research and development both in academia and industry. Timely and accurate data with high resolutions holds great promise for more responsible and advanced grid control and operation. Currently, most of the research focuses on the different control schemes and applications. A relatively less addressed aspect is the dependency of the WAMC system on the performance of the Information and Communication Technology (ICT) infrastructure, without whose support the projected functionalities of the WAMC systems will be not achieved. Possible delays brought by the complex data transfer and processing processes in WAMC systems are addressed in the first part of this paper. Thereafter, simulations where delayed Phasor measurements are fed to a typical WAMC application - Static Var Compensation (SVC) are conducted iteratively to detect its maximum tolerated delay. Furthermore, performance requirements to design a reliable SVC function are analyzed based on simulation results. In conjunction with the requirement discussion, a robust ICT architecture is proposed to mitigate the data latency and incompleteness issue. The paper is concluded by addressing data quality issues relating to the remote signal based SVC controller system reliability.

  • 19.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    ICT architecture impact on wide area monitoring and control systems' reliability2011Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 26, nr 4, s. 2801-2808Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Timely and accurate data with high resolutions holds great promise for more responsible and advanced power grid operations. The research has been focusing on design of monitoring and control scheme given the assumptions that the supporting information and communication technology (ICT) systems are capable of providing data and perform control with sufficient quality. A relatively less addressed aspect is the dependency of wide-area monitoring and control (WAMC) systems on their supporting ICT architecture which is usually a compromise between various concerns, such as data quality, interoperability, or security. Without an appropriate ICT architecture design, the projected WAMC system functionalities run the risk of being jeopardized. This paper begins with a presentation about possible delays brought by complex data-transfer and processing processes. Analytical experiments are conducted with purposes to quantify the maximum delay and input signal's sensitivity toward delay on a typical WAMC application where the control of static var compensation (SVC) is coordinated with generator excitations using phasor measurements. Given the characteristics of this particular control scheme, two possible ICT architectures that provide data with different qualities are compared concerning the reliability of this WAMC application. This paper concludes by proposing a generic ICT architecture, enabling efficient WAMC systems implementation in terms of data quality.

  • 20.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    ICT system performance impact on wide area monitoring and control systems2012Inngår i: 44th International Conference on Large High Voltage Electric Systems 2012, 2012, s. 1-10Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Timely and accurate data with high resolutions holds great promise for more responsible and advanced power grid operations. The research has been focusing on design of monitoring and control scheme given assumptions that the supporting Information and Communication Technology (ICT) systems are capable to provide data and perform control with sufficient quality. A relatively less addressed aspect is the dependency of Wide area monitoring and control (WAMC) systems on their supporting ICT architecture which is usually a compromise between various concerns, such as data quality, interoperability or security. Without an appropriate ICT architecture design, the projected WAMC system functionalities run the risk of being jeopardized. This paper begins with a presentation about possible delays brought by complex data transfer and processing processes. Analytical experiments are conducted with purposes to quantify the maximum delay and input signal's sensitivity towards delay on a typical WAMC application where the control of Static Var Compensation (SVC) is coordinated with generator excitations using phasor measurements. Given the characteristics of this particular control scheme, two possible ICT architectures that provide data with different qualities are compared concerning the reliability of this WAMC application. The paper is concluded by proposing a generic ICT architectures enabling efficient WAMC systems implementation in terms of data quality.

  • 21.
    Zhu, Kun
    et al.
    Ventyx ABB Co, S-10044 Vasteras, Sweden.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Holmström, Sture
    Ericsson, Göran
    Design Requirements of Wide-Area Damping Systems-Using Empirical Data From a Utility IP Network2014Inngår i: IEEE Transactions on Smart Grid, ISSN 1949-3053, E-ISSN 1949-3061, Vol. 5, nr 2, s. 829-838Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Phasor Measurement Unit (PMU) communication delays and data frame losses play a critical role in designing of wide-area damping systems driven by synchrophasor technology. While there are a plethora of simulation-based studies addressing this issue, empirical results from actual PMUs deployed in the field are rare. This paper provides important insights into the characterization of PMU communication delays and data frame losses based on empirical results collected from a utility IP network. Additionally, efforts are also made to elicit design requirements considering the above PMU data quality problems. Furthermore, three distinct delay-robust wide-area damping control schemes parameterized according to the proposed requirements are validated against the empirical delays and data frame losses. Time-domain simulation results suggest that the control schemes in question can effectively stabilize the power system in all of the tested scenarios.

  • 22.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Holmström, Sture
    Erisson, Göran
    An Empirical Study of Synchrophasor Communication Delay in a Utility TCP/IP Network2013Inngår i: International Journal of Emerging Electric Power Systems, ISSN 2194-5756, E-ISSN 1553-779X, Vol. 14, nr 4, s. 341-250Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Although there is a plethora of literature dealing with Phasor Measurement Unit (PMU) communication delay, there has not been any effort to generalize empirical delay results by identifying the distributions with the best fit. The existing studies typically assume a distribution, or simply build on analogies to communication network routing delay. Specifically, this study provides insight into the characterization of the communication delay of both unprocessed PMU data and synchrophasors sorted by a Phasor Data Concentrator (PDC). The results suggest that a bi-modal distribution containing two normal distributions offers the best fit of the delay of the unprocessed data, whereas the delay profile of the sorted synchrophasors resembles a normal. Based on these results, the possibility of evaluating the reliability of a synchrophasor application with respect to a particular choice of PDC timeout is discussed.

  • 23.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Deo, Samarth
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Al-Hammouri, Ahmad
    Jordan University of Science and Technology.
    Honeth, Nicholas
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Babazadeh, Davood
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lars, Nordström
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Test platform for synchrophasor based wide-area monitoring and control applications2013Inngår i: Power and Energy Society General Meeting (PES), 2013 IEEE, Vancouver: IEEE , 2013, s. 6672308-Konferansepaper (Fagfellevurdert)
    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.

  • 24.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Honeth, Nicholas
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Xu, Yuan
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Investigation of data exchange requirements for cooperative grid planning and operation2011Konferansepaper (Fagfellevurdert)
    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.

  • 25.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Design of wide-area damping systems based on the capabilities of the supporting Information Communication Technology infrastructure2014Inngår i: IET Generation, Transmission & Distribution, ISSN 1751-8687, E-ISSN 1751-8695, Vol. 8, nr 4, s. 640-650Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The dependence of the functionality of the wide-area monitoring and control (WAMC) systems on the capabilities of their underlying Information Communication Technology (ICT) infrastructure indicates that the parameterisation of the WAMC application algorithm should be coordinated with the design of the supporting ICT system. This study presents a systematic approach to design wide-area damping systems considering phasor measurement unit (PMU) communication delays and data frame losses. The proposed design method is applied to calibrate a wide-area damping system based on generalised predictive control (GPC) for demonstration purposes. In addition, a framework to guide the parameterisation of the GPC- based wide-area damping system is also provided. This research offers a better perspective to predict the capabilities of the underlying ICT infrastructure in the WAMC systems. Moreover, the proposed design method can be generalised to design delay-robust damping systems with compensation limits. Finally, it also offers an opportunity to associate the parameterisation of the damping system with the capabilities of its supporting ICT infrastructure and the reliability of the intended damping control function.

  • 26.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstam, Lennart
    Application and analysis of Optimum PMU Placement methods with application to State Estimation Accuracy2009Inngår i: 2009 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, VOLS 1-8, New York: IEEE , 2009, s. 580-586Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor measurement units (PMU) coupled with high speed and bandwidth communication infrastructure holds great promise for future power system control and operation. The geographic location of the PMUs within the power system naturally affects the value added by PMUs to one specific application in power grid control and operation. Optimization of placement has been the subject of much analysis and research. This paper compares one PMU placement method targeting enhancement of state estimation accuracy with the current PMU deployment method utilized in Svenska Kraftnat (SvK), the Swedish Transmission System Operator. The possible estimation improvement applying this optimum placement algorithm is further studied while more PMUs are involved. Considering that the deployment of PMUs within SvK's grid is still limited, the study has been performed in a simulation environment. The paper contains a brief description of the simulation platform and the assumptions made during the work as well. The analysis shows that there are considerable gains to be made in estimator accuracy if the PMUs are placed in accordance with this method when compared to the current placement strategy. It could also be observed when the PMU monitored buses reaches a certain number in the entire network, the further introduction of phasor measurements will not be as effective in estimation accuracy improvement.

  • 27.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Hammouri, A.
    Jordan University of Science and Technology .
    Examination of data delay and packet loss for wide-area monitoring and control systems2012Inngår i: 2012 IEEE International Energy Conference and Exhibition, ENERGYCON 2012, IEEE , 2012, s. 927-934Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Timely and synchronized phasor data at high resolutions holds a great promise for more responsible and advanced power grid operations. It is expected that the combined effort of developing new application paradigms and the supporting Information and Communication Technology (ICT) will enable the evolutionary change for future transmission grid operation. This paper addresses the design of the supporting ICT system for Wide-Area Monitoring and Control applications considering system performance. The major contribution that distinguishes this paper from previous research efforts in the same area is that this study quantifies the end-to-end data delay and the received packet rate with considerations of different levels of data concentrations. The analysis performed in this paper is not merely limited to the performance issues caused by communication networks but also provides means to view and analyze the overall data delay of the entire supporting ICT system.

  • 28.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Song, Ji
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Analysis of phasor data latency in wide area monitoring and control systems2010Inngår i: 2010 IEEE International Conference on Communications Workshops, ICC 2010, Capetown, 2010Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Synchronized phasor measurement based Wide Area Monitoring and Control (WAMC) system is becoming a reality within international research and development both in academia and industry. Timely and accurate data with high resolutions holds great promise for more responsible and advanced grid control and operation. Currently, most of the research focuses on the different control schemes and applications. A relatively less addressed aspect is the dependency of the WAMC system on the performance of the Information and Communication Technology (ICT) infrastructure, without whose support the projected functionalities of the WAMC systems will be not achieved. Possible delays brought by the complex data transfer and processing processes in WAMC systems are addressed in the first part of this paper. Thereafter, simulations where delayed Phasor measurements are fed to the Static Var Compensator (SVC) are conducted iteratively to detect its maximum tolerated delay. Furthermore, performance requirements for the centralized computation and control actuation are researched and analyzed based on simulation results. It also includes a study on feasibility of compensations using local signal based Power System Stablizers (PSS) in situations with much phasor data delay. The paper is concluded by suggesting ICT architecture for WAMC systems aiming to improve its robustness.

  • 29.
    Zhu, Kun
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Yuan, Xu
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Honeth, Nicholas
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Data Volume Estimation for CIM based Information Exchange2011Konferansepaper (Fagfellevurdert)
    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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