Lars Nordstrom - Profile on Academia.edu (original) (raw)
Papers by Lars Nordstrom
IEC61850 Interface based Multi-agent Distribution Networks Operation and Control Architecture
Agent-based control of VSC-HVDC transmission grid - A Cyber Physical System perspective
2014 Workshop on Modeling and Simulation of Cyber-Physical Energy Systems (MSCPES), 2014
ABSTRACT This paper proposes a control scheme to coordinate the DC voltage of converters in a HVD... more ABSTRACT This paper proposes a control scheme to coordinate the DC voltage of converters in a HVDC grid using a Multi-agent System concept. Such interactions between agents, converters, and communication units are approached from a Cyber-Physical System (CPS) perspective. The Multi-agent based control scheme tries to update the DC voltage set-points of the converters based on local and neighboring information. The information exchange between the agents and communication delay tolerance of the control scheme is studied by means of graph theory. The multi-agent control scheme has been implemented for a seven-terminal HVDC grid in a real time simulator and the impact of communication delay on this distributed control approach has been studied and is presented in the result.
A case study applying the Cyber Security Modeling Language
ABSTRACT
Stateful Data Delivery Service for Wide Area Monitoring and Control Applications
2014 44th Annual IEEE/IFIP International Conference on Dependable Systems and Networks, 2014
Computerized control systems have been used in many years to supervise and control power distribu... more Computerized control systems have been used in many years to supervise and control power distribution. These systems, which often are referred to as SCADA (Supervisory Control And Data Acquisition) systems, have in recent been more and more interconnected to other systems in recent years. In modern utilities various kinds of data are exchanged between the distribution management systems and the administrative systems located in the office network. For example are operational statistics, trouble reports and switch orders often communicated between the office systems and the systems inside the control center.
IEEE PES T&D 2010, 2010
The future smart electricity grids will exhibit tight integration between control and automation ... more The future smart electricity grids will exhibit tight integration between control and automation systems and primary power system equipment. Optimal and safe operation of the power system will be completely dependent on well functioning information and communication (ICT) systems. Considering this, it is essential that the control and automation systems do not constitute the weak link in ensuring reliable power supply to society. At the same time, studies of reliability when considering complex interdependencies between integrated ICT systems becomes increasingly difficult to perform due to the large amount of integrated entities with varying characteristics involved. To manage this challenge there is a need for structured modeling and analysis methods that accommodate this characteristics and interdependencies. In other fields, the analysis of large interconnected systems is done using models that capture the systems and its context as well as its components and interactions. This paper addresses this issue by combining enterprise architecture methods that utilize these modeling concepts, with fault tree analysis and probabilistic relational models. This novel approach enables a holistic overview thanks to the use of formalized models. It also allows use of rigorous analysis thanks to the adaptation of the models to enable Fault Tree Analysis. The paper is concluded with an example of application of the analysis method on a proposed smart grid function in a distribution network.
Coordination of Power Injection in HVDC Grids with Multi-TSOs and Large Wind Penetration
11th IET International Conference on AC and DC Power Transmission, 2015
To concentrate or not to concentrate: Performance analysis of ICT system with data concentrations for Wide-area Monitoring and Control Systems
2012 IEEE Power and Energy Society General Meeting, 2012
ABSTRACT Timely and synchronized phasor data at high resolutions holds great promise for more res... more ABSTRACT 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.
Forecasting household consumer electricity load profiles with a combined physical and behavioral approach
Applied Energy, 2014
ABSTRACT In this paper, a simulation model that forecasts electricity load profiles for a populat... more ABSTRACT In this paper, a simulation model that forecasts electricity load profiles for a population of Swedish households living in detached houses is presented. The model is constructed of three separate modules, namely appliance usage, Domestic Hot Water (DHW) consumption and space heating. The appliance and DHW modules are based on non-homogenous Markov chains, where household members move between different states with certain probabilities over the days. The behavior of individuals is linked to various energy demanding activities at home. The space heating module is built on thermodynamical aspects of the buildings, weather dynamics, and the heat loss output from the aforementioned modules. Subsequently, a use case for a neighborhood of detached houses in Sweden is simulated using a Monte Carlo approach. For the use case, a number of justified assumptions and parameter estimations are made. The simulations results for the Swedish use case show that the model can produce realistic power demand profiles. The simulated profile coincides especially well with the measured consumption during the summer time, which confirms that the appliance and DHW modules are reliable. The deviations increase for some periods in the winter period due to, e.g. unforeseen end-user behavior during occasions of extreme electricity prices.
Stochastic evaluation of aggregator business models — Optimizing wind power integration in distribution networks
2014 Power Systems Computation Conference, 2014
2006 IEEE PES Power Systems Conference and Exposition, 2006
the IEC 61968 standard is being developed to facilitate integration of applications related to di... more the IEC 61968 standard is being developed to facilitate integration of applications related to distribution management, i.e. the management of power distribution networks. As an important baseline the standard contains an Interface Reference Model (IRM). IRM contains functions that define the scope of distribution management. This paper presents a study that was conducted regarding the use of the IRM as a base for evaluating functionality of commercial asset management solutions. The subset of the IRM related to asset management was studied, and based on this subset a refined reference model was created.
Integrated multi-agent testbed for decentralized control of active distribution networks
2013 IEEE Power & Energy Society General Meeting, 2013
ABSTRACT This paper describes the development of a testbed for multi-agent based decentralized co... more ABSTRACT 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.
Design of Wide-Area Damping System based on the Capabilities of the Supporting ICT Infrastructure
ABB company, Mäster Ahls Gata, Västerås, Sweden
Modeling and Evaluating the Maturity of IT Governance
Identifying Benefits for Transmission Grid Operation from Information Exchange
Probabilistic Relational Models for Reliability Centered Asset Management of Active Distribution Management Systems
ICT system performance impact on wide area monitoring and control systems
Designing Household Demand Response System Supporting the EU Energy Policy
Analysing Policy Texts for System Capabilities
IEC61850 Interface based Multi-agent Distribution Networks Operation and Control Architecture
Agent-based control of VSC-HVDC transmission grid - A Cyber Physical System perspective
2014 Workshop on Modeling and Simulation of Cyber-Physical Energy Systems (MSCPES), 2014
ABSTRACT This paper proposes a control scheme to coordinate the DC voltage of converters in a HVD... more ABSTRACT This paper proposes a control scheme to coordinate the DC voltage of converters in a HVDC grid using a Multi-agent System concept. Such interactions between agents, converters, and communication units are approached from a Cyber-Physical System (CPS) perspective. The Multi-agent based control scheme tries to update the DC voltage set-points of the converters based on local and neighboring information. The information exchange between the agents and communication delay tolerance of the control scheme is studied by means of graph theory. The multi-agent control scheme has been implemented for a seven-terminal HVDC grid in a real time simulator and the impact of communication delay on this distributed control approach has been studied and is presented in the result.
A case study applying the Cyber Security Modeling Language
ABSTRACT
Stateful Data Delivery Service for Wide Area Monitoring and Control Applications
2014 44th Annual IEEE/IFIP International Conference on Dependable Systems and Networks, 2014
Computerized control systems have been used in many years to supervise and control power distribu... more Computerized control systems have been used in many years to supervise and control power distribution. These systems, which often are referred to as SCADA (Supervisory Control And Data Acquisition) systems, have in recent been more and more interconnected to other systems in recent years. In modern utilities various kinds of data are exchanged between the distribution management systems and the administrative systems located in the office network. For example are operational statistics, trouble reports and switch orders often communicated between the office systems and the systems inside the control center.
IEEE PES T&D 2010, 2010
The future smart electricity grids will exhibit tight integration between control and automation ... more The future smart electricity grids will exhibit tight integration between control and automation systems and primary power system equipment. Optimal and safe operation of the power system will be completely dependent on well functioning information and communication (ICT) systems. Considering this, it is essential that the control and automation systems do not constitute the weak link in ensuring reliable power supply to society. At the same time, studies of reliability when considering complex interdependencies between integrated ICT systems becomes increasingly difficult to perform due to the large amount of integrated entities with varying characteristics involved. To manage this challenge there is a need for structured modeling and analysis methods that accommodate this characteristics and interdependencies. In other fields, the analysis of large interconnected systems is done using models that capture the systems and its context as well as its components and interactions. This paper addresses this issue by combining enterprise architecture methods that utilize these modeling concepts, with fault tree analysis and probabilistic relational models. This novel approach enables a holistic overview thanks to the use of formalized models. It also allows use of rigorous analysis thanks to the adaptation of the models to enable Fault Tree Analysis. The paper is concluded with an example of application of the analysis method on a proposed smart grid function in a distribution network.
Coordination of Power Injection in HVDC Grids with Multi-TSOs and Large Wind Penetration
11th IET International Conference on AC and DC Power Transmission, 2015
To concentrate or not to concentrate: Performance analysis of ICT system with data concentrations for Wide-area Monitoring and Control Systems
2012 IEEE Power and Energy Society General Meeting, 2012
ABSTRACT Timely and synchronized phasor data at high resolutions holds great promise for more res... more ABSTRACT 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.
Forecasting household consumer electricity load profiles with a combined physical and behavioral approach
Applied Energy, 2014
ABSTRACT In this paper, a simulation model that forecasts electricity load profiles for a populat... more ABSTRACT In this paper, a simulation model that forecasts electricity load profiles for a population of Swedish households living in detached houses is presented. The model is constructed of three separate modules, namely appliance usage, Domestic Hot Water (DHW) consumption and space heating. The appliance and DHW modules are based on non-homogenous Markov chains, where household members move between different states with certain probabilities over the days. The behavior of individuals is linked to various energy demanding activities at home. The space heating module is built on thermodynamical aspects of the buildings, weather dynamics, and the heat loss output from the aforementioned modules. Subsequently, a use case for a neighborhood of detached houses in Sweden is simulated using a Monte Carlo approach. For the use case, a number of justified assumptions and parameter estimations are made. The simulations results for the Swedish use case show that the model can produce realistic power demand profiles. The simulated profile coincides especially well with the measured consumption during the summer time, which confirms that the appliance and DHW modules are reliable. The deviations increase for some periods in the winter period due to, e.g. unforeseen end-user behavior during occasions of extreme electricity prices.
Stochastic evaluation of aggregator business models — Optimizing wind power integration in distribution networks
2014 Power Systems Computation Conference, 2014
2006 IEEE PES Power Systems Conference and Exposition, 2006
the IEC 61968 standard is being developed to facilitate integration of applications related to di... more the IEC 61968 standard is being developed to facilitate integration of applications related to distribution management, i.e. the management of power distribution networks. As an important baseline the standard contains an Interface Reference Model (IRM). IRM contains functions that define the scope of distribution management. This paper presents a study that was conducted regarding the use of the IRM as a base for evaluating functionality of commercial asset management solutions. The subset of the IRM related to asset management was studied, and based on this subset a refined reference model was created.
Integrated multi-agent testbed for decentralized control of active distribution networks
2013 IEEE Power & Energy Society General Meeting, 2013
ABSTRACT This paper describes the development of a testbed for multi-agent based decentralized co... more ABSTRACT 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.
Design of Wide-Area Damping System based on the Capabilities of the Supporting ICT Infrastructure
ABB company, Mäster Ahls Gata, Västerås, Sweden
Modeling and Evaluating the Maturity of IT Governance
Identifying Benefits for Transmission Grid Operation from Information Exchange
Probabilistic Relational Models for Reliability Centered Asset Management of Active Distribution Management Systems
ICT system performance impact on wide area monitoring and control systems
Designing Household Demand Response System Supporting the EU Energy Policy
Analysing Policy Texts for System Capabilities