Publications Search Results

Now showing 1 - 10 of 53
  • Publication
    Container-based Virtualization of an IEC 61850 Substation Co-Simulation Approach
    In automated structures of the power grid, such as the digitized substations, dependencies of the functionality on the communication network are increasingly the focus of considerations. A co-simulation enables the joint and holistic analysis of the two subsystems - the power grid and the network communication infrastructure. Our approach presented here is considered with the real-world requirements of IEC 61850-based substations and is assigned to them. From this, the requirements for co-simulation and coupling of the two subsystems are derived. Using the IEC 61850 communication standard consequently, a substation can be fully described and automatically passed to the co-simulation by a presented framework to perform analyses in real-time online operation. By automation, the framework can reduce the implementation effort, which is usually significantly higher within virtualization than in available network simulation systems. Under certain prerequisites and conditions, our approach enables the generation of valid network traffic, which can be used for downstream analyses of the network.
  • Publication
    Combined Network Intrusion and Phasor Data Anomaly Detection for Secure Dynamic Control Centers
    ( 2022) ;
    Schäfer, Kevin
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    Gupta, Parul
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    The dynamic operation of power transmission systems requires the acquisition of reliable and accurate measurement and state information. The use of TCP/IP-based communication protocols such as IEEE C37.118 or IEC 61850 introduces different gateways to launch cyber-attacks and to compromise major system operation functionalities. Within this study, a combined network intrusion and phasor data anomaly detection system is proposed to enable a secure system operation in the presence of cyber-attacks for dynamic control centers. This includes the utilization of expert-rules, one-class classifiers, as well as recurrent neural networks to monitor different network packet and measurement information. The effectiveness of the proposed network intrusion and phasor data anomaly detection system is shown within a real-time simulation testbed considering multiple operation and cyber-attack conditions.
  • Publication
    A Novel Framework Architecture for Distributed Digital Twins in Power Systems
    This paper presents a comprehensive approach of a novel framework architecture for distributed digital twins (DTs) in power systems. This scientific work is a part of the research project AUTOGRID1, which goal is the development and investigation of new methods and algorithms to increase the automation-level for the distribution grid operation based on distributed DTs.. A higher automation level is required in order to maintain the stability and safe operation of the grid under high penetration of renewable energies and power electronic devices. In this sense, the DTs are an important part of this project, because they allow enhancing the system observability, capture systems dynamic and adapt the DT models according to changes and events in the real systems. Hence, this paper describes a framework architecture for coupling multiple DT models, their requirements and the implemented functionalities in each DT.
  • Publication
    Planning Strategy for a Zero Carbon Cross Sectoral Energy System
    This paper presents a new multi-criteria optimization model for energy system planning that combines the sectors of electricity, heat, material use (gas, fuels, H2) and mobility. In contrast to other multi-criteria approaches for energy-system-planning [1, 2, 3, 4], the aim of the presented model is to find an optimal set of technologies to reduce and finally provide a CO2 neutral energy system by 2050 at the latest in a cost-optimal manner. To do so, a wide set of generation and storage technologies as well as the sector connecting Power-to-X technologies are modeled in a technical and economical manner. The planning process is restricted by realistic assumptions for the potentials and the annual expansion rates for the different technologies. To depict the uncertain political and social conditions, a euphoric and a conservative scenario are investigated. The different accounting methods for the emissions are discussed to find an energy system that is not strongly dependent on the remaining German energy system [5]. The assumptions and first results of the case study for Thuringia are presented and discussed in the paper.
  • Publication
    Analysis of methodologies for systemic assessment of buildings and districts
    ( 2021)
    Kharboutli, Samir
    ;
    The focus of the paper is the analysis of different methodologies for the evaluation of systemic aspects of buildings and districts. A distinction is made between the objectives of economy, ecology, system serviceability and resilience. For each sub-area, common quantification options are analysed and evaluated in order to present the research needs and further development possibilities with regard to a holistic evaluation. This intended evaluation will have to take different, possibly conflicting, criteria into account, for which a multi-cultural objective function is likely to be formulated in the case of the search for the optimal solution.
  • Publication
    Combined simulation and virtualization approach for interconnected substation automation
    The interaction between communication technology and the power grids is a major issue in research studies to investigate the effect of cyberattacks, communication failures and other errors to the physical behavior of the power grid. Especially the interconnected digitalized substations of the modern power grids are of interest due to their high-risk potential and dependence of communication technology. Disturbances and negative influences on these key control entities can affect the entire underlying power supply as a critical infrastructure. Recent publications and research projects are trying to investigate the effects by using simulation tools within co-simulation approaches. In this paper, we present a novel approach using a conventional real-time power grid simulation and to combine it with a container-based virtualization of the communication infrastructure. The communication infrastructure contains all the important and necessary components, hosts, devices, and communication aspects to set the network traffic and interactivity of substation automation setups regarding the IEC 61850 standard. This paper will show the feasibility of combining online real-time grid simulation to a container-based virtualization on the process level. The evaluation is done by analyzing occurred time delays and latency about requirements given by IEC 61850 standard. A validation against these transmission time requirements is presented to provide an indication of the feasibility of our approach.
  • Publication
    Influence of autoregressive noise on phasor data based disturbance classification
    ( 2021)
    Kummerow, André
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    Monsalve, Christian
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    The automated classification of grid disturbances based on phasor measurement units (PMU) is a key application for a fast and reliable monitoring and control of future power systems. The predominant use of dynamic simulations for the training of the classification models can lead to severe misclassifications during the application phase due to measurement induced error signals. As an advancement to standard white noise approaches, an optimization-based error model is introduced for the synthesis of PMU measurement signals with specific noise characteristics. This approach allows a flexible creation of more sophisticated error signals. Extensive simulation studies are performed for a disturbance classification model based on a recurrent neural network using a large electrical transmission grid.
  • Publication
    Modelling and coupling multi-energy systems for supplying methane to transportation sector in Germany
    The MethQuest research project is about creating new processes for generating renewable gas fuels and progressing existing technologies. At the same time, the project investigates appropriate optimization concepts for motors and engines in cars, ships and electric power generation systems. In addition, MethQuest aims to develop solutions for linking infrastructure for electricity, gas and heat and researches the possible effects and benefits the large-scale introduction of renewable gas might have in the energy sector in Germany. The project is divided into several individual projects in order to deal with the large topic area in a targeted manner. The project MethSys is developing a whole-area simulation for Germany covering the supply of renewable energy methane and the entire logistics chain from generation, transport and storage through to end-users. The group is likewise creating a comprehensive concept illustrating how the operation of Power-to-Gas (P2G) plants can best be controlled across the entire energy system to ensure an optimum grid operation. The paper describes the models and methodology used for evaluating technically electric distribution grid and assessing regional infrastructure requirements for integrating P2G that allow supplying the transportation sector under different market development scenarios.
  • Publication
    Optimization of a Parametric Fundamental Model for Unit Commitment Modeling
    ( 2021)
    Sommer, Henrik
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    Winkelkotte, Martin
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    Die Strompreisprognose ist ein wichtiges Werkzeug für Marktteilnehmer am Strommarkt zur Optimierung ihrer Handelsentscheidungen. Strompreisprognosen basieren auf Modellen, die den Strommarkt möglichst genau abbilden. Ein Modellansatz sind die Fundamentalmodelle (FM). Diese stellen hohe Anforderungen and die verwendeten Eingangsdaten. In der vorliegenden Arbeit wird ein bestehender Ansatz zur Erhöhung der Modellgenauigkeit von FM insbesondere bei geringer Eingangsdatenqualität erweitert und untersucht. Der bestehende Ansatz, bei dem die Eingangsdaten mithilfe eines Parametersets optimiert wurden, wurde dazu um den Aspekt der multiplen Parametersets für verschiedene Situationen erweitert.
  • Publication
    Application of blockchain technology for electricity supplier change
    ( 2020)
    Pemsel, Jonas
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    Warweg, Oliver
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    Bretschneider, Peter
    In the course of digitalization various technologies which could deeply transform present processes are put forth. As such an innovation, blockchain is attributed to have potential to make energy industry procedures more efficient and to simplify them. The aim of this paper is to examine the applicability of this technology using the change of power supplier as an example. Based on Ethereum a proper blockchain solution for the use-case is developed using smart contracts to handle all processes of the example. Beside qualitative evaluation of manipulation security and privacy, a test scenario is built to measure the speed in which the developed solution allows supplier changes.