Now showing 1 - 10 of 157
  • Publication
    Testing Automated Operation and Control Algorithms for Distribution Grids Using a Co-Simulation Environment
    ( 2021)
    Schoen, Andrea
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    Wille-Haussmann, Bernhard
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    Marchand, Sophie
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    This publication presents a co-simulation framework that enables the coupling of various simulation components of energy systems that are not only modeled at three geographically distributed Fraunhofer Institutes, but are also vastly different in terms of their functionality, control algorithms, time resolution, speeds and used tools. This framework facilitates their joint usage despite these differences especially with regard to their time resolutions (real-time combined with non-real-time systems) and is applied in the DistributedGridLab of the Fraunhofer Cluster of Excellence Integrated Energy Systems (CINES) [1]. The DistributedGridLab thus allows users - e.g. grid operators, manufacturers and research institutes - to test their solutions before field deployment with special consideration of their interaction with other solutions at different remote testing facilities, and without the need to use the same software and hardware setups. A demonstrator of the DistributedGridLab is introduced where an electric energy system is modeled, which contains a medium voltage grid with three connected low voltage grids. The different control approaches interact to stabilize the entire system without a centrally controlled simulation of the systems.
  • Publication
    Model based decision support systems
    This chapter describes a decision support system framework specifically developed to meet the growing demands and pressures on water resources managers. A generic concept is designed to be applicable to a wide variety of specific water resources system configurations, institutional conditions, and management issues. The framework is based on a detailed model of the water resources system being simulated and include scenario planning in combination with state-of-the-art large scale network flow optimization algorithm. Issues from the demand-side such as water use patterns, costs, and water allocation schemes are considered equally well as supply-side issues such as reservoirs, and water transfers. The system applies integrated approach to simulating both natural (e.g., runoff, baseflow) and man-made components (e.g., reservoirs, groundwater pumping) of water systems. This allows the system user access to a more comprehensive view of the broad range of factors that must b e considered in managing water resources for present and future use. The framework stresses out the sovereignty of the user, therefore features menu-driven graphics-based interfaces that facilitate user interaction and can be customized for water availability analysis, conjunctive surface and groundwater use, infrastructure planning, assessing irrigation potential and reservoir performance, estimating water supply capacity and to find equitable trade-offs among stakeholders requirements.
  • Publication
    Optimal control of free-floating autonomous underwater vehicles for manipulation tasks in shallow sea culture collection
    ( 2018)
    Li, Daoliang
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    Du, Ling
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    Bao, Jianhua
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    Li, Pu
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    There is an urgent demand for collection operations in the shallow sea cultivation. However, there have been very few investigations on underwater robots for this purpose. The overall objective of this paper is to investigate approaches for combined free-floating AUV and manipulation arm systems to autonomously collect shallow sea culture under complicated underwater conditions. For this purpose, following targets will be gained: 1)Development of new approaches for fast and precise identification and positioning of shallow sea culture (e.g. sea cucumber, dead fish) under complicated underwater conditions (e.g. convoluted terrain, weak light, fluctuating stream);2)Development of a detailed dynamic model for the combined AUV and manipulator system (UVMS) which can be applied for stable and reliable control to autonomously collect sea culture under complicated underwater conditions;3)Development of an optimal control strategy to realize operations for the combined AUV and manipulation arm to autonomously collect shallow sea culture subject to multiple operating constraints. The above objectives can be fulfilled by answering the following questions. A system design to to reliably identify the target object, which need imaging data processing, segmentation and classification, to estimate its position relative to the object, which calls for a position estimator that fuses imaging data (e.g., sonar, vision) with IMU measurements, to control its position relative to the object for station-keeping and the tool at the end of the arm system need to be set in the right position and orientation. The dynamics of both the AUV and the arm system (MS), their interactions with the environment need to be modeled, and to minimize the time, minimum energy, minimum error and smoothness to a target position.
  • Publication
    A smart market approach to coordinate market and grid operations
    Within the venture ""REGEES"" (REGenerative rEnewable Electricity System) a new approach for a Coordinated Market Grid Operation Management (CMGOM) was developed. It envisages the extension of the balancing process of Balance Responsible Party (BRP) including information of current or estimated grid situation. This paper discusses two different approaches to calculate the restrictions for BRPs by the DSO and the resultant consequences for BRPs optimization. The approaches are applied and assessed in test cases that show their benefits and disadvantages.
  • Publication
    Demand response clustering - how do dynamic prices affect household electricity consumption?
    ( 2015)
    Waczowicz, Simon
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    Reischl, Markus
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    Hagenmeyer, Veit
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    Mikut, Ralf
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    Konotop, Irina
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    The article analyses effects of price signals on the consumption behavior of household electricity customers. It proposes a systematic analysis process consisting of data preprocessing, aggregation steps and clustering methods. This analysis process was applied to two smart meter datasets (Olympic Peninsula Project, RESIDENS). Large fluctuations in customers' response to the same price signal were detected.
  • Publication
    Classification of production quality in injection moulding with an embedded diagnostic system using a fuzzy inference system
    ( 2016)
    Schneider, Manuel
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    Walther, Christian
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    The construction of a fuzzy inference system for calculation of the production quality within injection moulding processes is described in this contribution. The aim of this work is to get an automatic decision for the quality of the production cycle. For the measurement pressure sensors are used within the cavity of the moulding tool. The sensor signals were sampled and analysed by an embedded diagnostic system that was integrated into the injection moulding tool.
  • Publication
    Cleaning strategies and cost modelling of experimental membrane-based desalination plants
    In Project WASTEC, an experimental Reverse Osmosis (RO) desalination system was developed. It serves as a platform for testing new technologies. For this system, we solved two problems, which are described in this paper. Firstly, we developed and investigated strategies for scheduling chemical enhanced backwashing and chemical cleaning and secondly, due to the experimental nature of the project, several new technological developments with respect to materials and methods were integrated into the system and requires tools for evaluating the economic viability of the new technologies. In this task, the economics of membrane-based desalination will be investigated. Baseline systems of reverse osmosis and pretreatment systems (microfiltration and ultrafiltration) will be economically examined and compared for their investments and operational costs. Sensitivity of the different plant and membrane parameters to the cost will be studied. Results show that with respect to costs, for a 200m3/hr design capacity plant, a volume of water is produced by a MF process at a cost of $0.494 and at a cost of $0.486 by an ultrafiltration process microfiltration. The reverse osmosis process cannot be compared directly, but it required $ 0.49 / m3 for a plant with 56 m3/hour design capacity. The values are in line with the costs reported in literature for membrane-based filtration.
  • Publication
    Mit dem Internet der Dinge vom Gebäude- zum Quartiersenergiemanagement
    Kleine und mittlere Liegenschaften verfügen häufig nur über unabhängige Automatisierungssysteme für die jeweiligen Gewerke (""Insel-Lösungen"), wobei die erfassten Daten in der Regel nicht systematisch ausgewertet und für eine energetisch optimierte Betriebsführung genutzt werden. Offene IoT (Internet of Things)-Plattformen können in Zukunft einen Beitrag leisten, um für eine Liegenschaft eine gewerkeübergreifende, energieoptimierte Gebäudebewirtschaftung zu ermöglichen. Erweitert man diesen Ansatz auf die Liegenschaften eines Quartiers in Form eines sektorübergreifenden Quartiersenergiemanagements (District Energy Management, DEMS), können zusätzliche Energieeinspar- und Flexibilitätspotentiale erschlossen und neue Geschäftsmodelle generiert werden. Im Rahmen des Deutsch-Französischen Projektes EBITA (Exploiting the Scientific and Business Potential when Integrating Smart Data Analytics into Internet of Things Applications) werden Lösungen erarbeitet, die das Potential des Internet der Dinge im Bereich Smart Building und Smart Grid erschließen, um durch die Zusammenführung von Informationen aus den existierenden heterogenen ICT-Infrastrukturen einen Beitrag für die optimale Systemintegration und Betriebsführung erneuerbarer Energien zu leisten. Dabei sollen u.a. Möglichkeiten für neue digitale Dienste erarbeitet werden. Durch eine neuartige Verknüpfung der Anwendungsgebiete Smart Building und Smart Grid wird ein sektorübergreifender Ansatz für ein Quartiersenergiemanagement (District Energy Management) erarbeitet. In Demonstratoren am Fraunhofer IOSB (Karlsruhe, Ilmenau) und der Sorbonne Universität (Paris) wird das Konzept prototypisch umgesetzt. Dabei wird auch ein systemischer Ansatz zur Integration der Zielstellungen aller Akteure unter Berücksichtigung der Randbedingungen des liberalisierten Energiemarktes verfolgt.
  • Publication
    Analysis of methodologies for systemic assessment of buildings and districts
    ( 2021)
    Kharboutli, Samir
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    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.