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Microgrid standards and technologies

Microgrid standards and technologies

引用

IEEE General Meeting Power& Energy Society

作者： Benjamin Kroposki Thomas Basso Richard DeBlasio National Renewable Energy Laboratory Golden CO USA

Microgrids are intentional islands formed at a facility or in an electrical distribution system that contain at least one distributed energy resource and associated loads. Microgrids that operate both electrical generation and loads in a coordinated manner can offer benefits to the customer and the local utility. The loads and energy sources in a microgrid can be disconnected from and reconnected to the utility system with minimal disruption, thereby improving reliability. Any time a microgrid is implemented in an electrical distribution system, it must be well planned to avoid problems. This paper discusses current microgrid technologies and standards that are being developed to address implementation of microgrids.

关键词： density estimation robust algorithm Switches Power systems Integrated circuit interconnections Distributed control Power electronics Reliability

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Reliability study of a micro grid system with optimal sizing and placement of DER

Reliability study of a micro grid system with optimal sizing...

引用

CIRED Seminar 2008: SmartGrids for Distribution

作者： A.K. Basu A. Bhattacharya S.P. Chowdhury S. Chowdhury P.A. Crossley C.I.E.M. Kolkata India Jadavpur University India Women''s Polytechnic Kolkata Kolkata India University of Manchester Institute of Science and Technology UK

Microgrids comprise a network of small scale distributed energy resources (DERs) like fuel cells, micro turbines, PV arrays and wind turbine etc. and energy storage devices. Current deregulation regime is encouraging open competition amongst the small/medium utility service providers in providing quality and reliable 'clean' power to the customers at an economic rate. Economic power production is related to higher operational efficiency of the generating and distribution systems. In the reforming process, taxes and penalties imposed on the tariff system, like environmental pollution tax, contracted failure penalties etc. are posing problems for the fossil fuel plants. Microgrids with environment-friendly DERs have an edge over such problems. Microgrids also reduce line loss and CO 2 /NO x emission, increase overall energy efficiency through CHP operation, relieve T&D congestion and defer investments to upgrade existing generation. However, all these benefits could be achieved if DERs of the Microgrids have optimal size and location. This paper presents particle swarm optimization (PSO) technique to determine optimal size and location of the DER in a meshed network for maximizing the economic benefits by minimizing the line loss.

关键词： density estimation robust algorithm Line Losses Mesh networks penalty MICRO-GRID placement SIZING Energy storage devices grids Grates Energy efficiency Power production dispensing system turbines tax

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Mathematical Modelling and Performance Evaluation of a Stand-Alone Polycrystalline PV Plant with MPPT Facility

Mathematical Modelling and Performance Evaluation of a Stand...

引用

IEEE Power and Energy Society General Meeting

作者： S. Chowdhury S. P. Chowdhury G. A. Taylor Y. H. Song Women's Polytechnic Kolkata India

ISBN: (纸本)9781424419050

Photovoltaic (PV) generation has now-a-days proved to be a cost-effective method for renewable power generation with minimum environmental impact. Due to environmental and economic benefits, PV is now being widely deployed as a distributed energy resources (DER) in distributed generation systems or microgrids. Extensive laboratory-based research and simulation studies are being performed for assessing its effectiveness as DER in microgrids. Simulation studies mostly involve development of mathematical models which can account for the variation of PV output with solar irradiance and ambient temperature as well as the simulation of MPPT feature that is built in the inverters usually interfaced with the PV arrays. Simulation studies of microgrids with interconnected DERs and elaborate control schemes often warrants the development of simple and robust mathematical models for PV arrays that would pose low mathematical burden on the system, have low data storage requirements and which can be represented by standard block sets of a modelling software. At the same time, the models should be able to simulate the weather dependent electrical behaviour of the PV modules. This paper reports on the development of a DC voltage source model of a polycrystalline PV Array in MATLAB Simulink and its performance analysis under various loading and weather conditions as well as the application of the model to develop a load shedding scheme for a stand-alone PV system.

关键词： Photovoltaic Distributed energy resources Irradiance Double exponential model MPPT feature Standard block set Load shedding scheme distributed energy resources PHOTOVOLTAIC irradiance Polydnaviridae mathematical modeling maximum power point trackers exponential model Performance Evaluation density estimation robust algorithm calibrated block Power production simulating photovoltaic array stand-alone data recorder Solar photovoltaics

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GridAgents™: Intelligent agent applications for integration of distributed energy resources within distribution systems

GridAgents™: Intelligent agent applications for integration...

引用

IEEE General Meeting Power& Energy Society

作者： David A. Cohen CEO

Infotilitypsilas GridAgentstrade software is being used for large-scale integration of distributed energy and renewable energy resources into distribution systems with specific applications on SmartGrid based energy networks including Microgrid management, intelligent load control and smart charging applications, including photovoltaics & storage, load control, and future assets such as plug-in hybrid cars. The GridAgentstrade EAM Suite is an advanced software foundation (based on multi-agent system technology) designed to work in concert with Service-oriented Architectures such as Web Services. The architecture enables the deployment of communities and eco-systems of intelligent grid resources which can adapt to changing run-time conditions collaborate to solve complex problems, and flexibly accommodate new behavior through the use of plug-in architectures. This paper will discuss the use of multi-agent systems used in the GridAgents software and will discuss some example applications and deployments currently being used with distribution utilities as part of distribution automation applications.

关键词： Software density estimation robust algorithm Generators Load management Energy resources Automation Industries

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Photovoltaic inverters used as active filters for improvement of IV distribution networks

Photovoltaic inverters used as active filters for improvemen...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： H. Beltran Z. Chen E. Belenguer N. Aparicio S. Segui-Chilet F. Gimeno-Sales Department of Industrial Systems Engineering University of Jaume-I Castellon Spain Institute of Energy Technology University of Aalborg Denmark Polytechnic University of Valencia Valencia Spain

The aim of this paper is to evaluate the benefits that can be achieved by operating the connection inverters of the distributed energy resources as active power filters in LV distribution networks. The use of photovoltaic inverters to compensate zero sequence currents, arising from unbalances among phases, can improve the efficiency of the distributed system by means of reducing the total amount of losses. For that purpose, a typical load in parallel with a distribution network where a photovoltaic inverter is connected has been simulated. The reductions in the distribution power losses and compensation of zero sequence currents have been demonstrated.

关键词： Photovoltaic systems Solar power generation Inverters Active filters Voltage density estimation robust algorithm Photovoltaic cells Renewable energy resources Power generation Circuits

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Quantitative analysis of border cell migration

Quantitative analysis of border cell migration

引用

Asilomar Conference on Signals, Systems & Computers

作者： Shann-Ching Chen Gaudenz Danuser Department of Cell Biology Scripps Research Institute La Jolla CA USA

ISBN: (纸本)9781424429400

Drosophila border cells are a genetically tractable model to study collective cell migration. With recent advances of culture conditions ex vivo, it becomes possible to observe the dynamics of this process in time-lapse image sequences. However, the complexity and heterogeneity of cell behaviors between experiments make it difficult to relate migration phenotypes back to the underlying genotypes. In this study, we propose image analysis algorithms to identify the boundary of border cell clusters, to track boundary movements and map them into a spatiotemporal space called morpho-dynamic profile, in which the effect of molecular perturbations can be quantitatively characterized. To this end, we design informative numerical features and train a support vector machine classifier to recognize cell migration patterns of different genotypes. Experimental results demonstrate that our technique can effectively quantify the morphological dynamics of border cell clusters, despite the substantial experimental heterogeneity, and identify similar movement patterns among different genotypes. These methods are now being combined with genetic approaches to systematically map out, by epistasis experiments, the interaction of multiple chemotactic pathways.

关键词： Cells (biology) Machine learning Genetics Embryo Microscopy density estimation robust algorithm Biological cells Biological system modeling Image sequences Image sequence analysis

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Impact of Smart Grid on distribution system design

Impact of Smart Grid on distribution system design

引用

IEEE General Meeting Power& Energy Society

作者： Richard E. Brown Quanta Technology USA

There has been much recent discussion on what distribution systems can and should look like in the future. Terms related to this discussion include smart grid, distribution system of the future, and others. Functionally, a smart grid should be able to provide new abilities such as self-healing, high reliability, energy management, and real-time pricing. From a design perspective, a smart grid will likely incorporate new technologies such as advanced metering, automation, communication, distributed generation, and distributed storage. This paper discussed the potential impact that issues related to smart grid will have on distribution system design.

关键词： Power system reliability Reliability Energy resources density estimation robust algorithm Automation System analysis and design Topology

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Hierarchical microgrid paradigm for integration of distributed energy resources

Hierarchical microgrid paradigm for integration of distribut...

引用

IEEE General Meeting Power& Energy Society

作者： Zhenhua Jiang Roger A. Dougal The Department of Electrical and Computer Engineering University of Miami Coral Gables USA The Department of Electrical Engineering University of South Carolina USA

This paper describes an approach to hierarchical integration of DC and AC microgrids containing distributed energy resources (DERs) into the existing electric power distribution infrastructure. Power electronic interfaces and controls permit the aggregated units at each level to represent themselves to a higher level as a single self-controlled entity (DC or AC, load or generator). At the top level of the hierarchy, the collection of all distributed energy resources within the microgrid appears to the utility grid as indistinguishable from many other currently legitimate customer sites. Maintaining this profile relies on the flexibility of advanced power electronics that control the interfaces among distributed energy resource units, DC links, AC links, and the surrounding power system. A decoupled control framework is then proposed for the hierarchical microgrid. Operational requirements and behavioral functions of the control systems are described in the paper. A case study demonstrates the operation of the microgrid paradigm.

关键词： Voltage control Batteries Fuel cells Inverters Energy resources Power systems density estimation robust algorithm

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Evolution of DSO control centre tool in order to maximize the value of aggregated distributed generation in smart grid

Evolution of DSO control centre tool in order to maximize th...

引用

CIRED Seminar 2008: SmartGrids for Distribution

作者： Maria Sebastian Juan Marti Peter Lang EDF Research and Development France Iberdrola S.A. Spain EDF Energy Networks Limited UK

This paper presents how implementing the new concept of aggregating a portfolio of DER, requires DSO and TSO control tools to be adapted. DER aggregation requires the coordination of numerous small generation units, that are too small to individually bid on energy markets or provide ancillary services. This work was produced by the FENIX project. This project is a collaborative R&D project, partly funded by the European Commission within the 6 Framework Program for Research, that aims at demonstrating the value and the feasibility of the concept of DER aggregation.

关键词： digital storage oscilloscopes density estimation robust algorithm evolution ACTION PLANS energy market grids Grates European Commission Standing Orders indium

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Coaction of protection and distribution management systems in case of islanded distribution networks

Coaction of protection and distribution management systems i...

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China International Conference on Electricity Distribution, CICED

作者： Nils Schaefer Thomas Degner Timo Keil Johann Jaeger Institut fuer Solare Energieversorgungstechnik (ISET) e.V. Kassel Germany Friedrich-Alexander-Universitat Erlangen-Nurnberg Erlangen Bayern DE Chair of Electrical Power Systems University of Erlangen-Nuremberg Erlangen Germany

This paper describes how an adjusted coaction of protection and distribution management systems in future distribution networks can help to improve security of supply. A high penetration with distributed energy resources is considered, challenges for network operation are discussed and protection concepts for both interconnected and islanded operation are developed.

关键词： density estimation robust algorithm Power system protection Power system management Control systems Energy management Power system security Power system restoration Automation Energy resources Integrated circuit interconnections

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