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检索条件"主题词=Density estimation robust algorithm"

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robust derivative-based method to determine filtered QRS limits in high resolution electrocardiography

Robust derivative-based method to determine filtered QRS lim...

引用

Computers in Cardiology (CinC)

作者： Olivassé Nasario-Junior Paulo R Benchimol-Barbosa Jurandir Nadal Universidade Federal do Rio de Janeiro Rio de Janeiro RJ Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781479943722

The accuracy of high resolution electrocardiogram (HRECG) as a risk stratification tool relies on QRS offset detection, which is subject to variation due to signal residual noise level (RNL). This study proposed a technique for improving the accuracy of QRS offset detection, based on successive signal derivation (DER) and compared to the standard method recommended by the American College of Cardiology (ACC). The control group was composed by 18 healthy volunteers with no cardiac disease and SMVT Group by 18 subjects with sustained monomorphic ventricular tachycardia. Mean QRS duration was compared by paired Student t-test between groups. Sensitivity, specificity and predictive values (PV) were compared by χ 2 test. For ACC and DER methods, the QRS offset was determined at a range of different RNLs simulated in the HRECG signal (from 0.2 to 0.8 μV), and the occurrence of linear correlation was tested (α

关键词： Signal resolution Electrocardiography density estimation robust algorithm Abstracts Interference Protocols Indexes

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Economic planning of distribution system

Economic planning of distribution system

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IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： A. Chandel D. S. Chauhan D. Singh BSACET Mathura INDIA GLA University Mathura INDIA KNIT Sultanpur INDIA

Recently there has been a considerable revival in interest in connecting generation to the distribution network in the form of Distributed Energy Resources (DER). DER benefits are site specific. In order to optimize the advantages of distributed generation it holds compulsively to reform management and to re-validate the operations of distribution network. Minimization of related costs and satisfying technical and physical constraints is also the key issue to concentrate. This paper presents a GA based methodology for DER planning in 37-bus IEEE distribution system for constant loading conditions. Various loading levels as specified by discos are taken into consideration. Further the subsystem and integrated distribution system is also taken into consideration.

关键词： density estimation robust algorithm Loading Cost function Asia Planning Economics Smart grids

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Operation and control of a hybrid AC-DC nanogrid for future community houses

Operation and control of a hybrid AC-DC nanogrid for future ...

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Australasian Universities Power Engineering Conference, AUPEC

作者： Ruwan P.S. Chandrasena Farhad Shahnia Arindam Ghosh Sumedha Rajakaruna Electrical and Computer Engineering Department Curtin University Perth Australia

A hybrid AC-DC nanogrid (NG) can be considered as the power supply system for future community houses. In this paper, the operation and control of a NG are presented. The NG consists of an AC bus and a DC bus, interconnected through a tie-converter. Each bus may have several loads and micro sources. The NG should have an adequate generation capacity to supply its loads in off-grid mode as well as the capability of exchanging power with the utility grid. The tie-converter exchanges the power between two buses and regulates bus voltage in both buses in the case of off-grid operation. Several case studies are presented using PSCAD/EMTDC to verify the NG dynamics.

关键词： Voltage control density estimation robust algorithm Switches Educational institutions Simulation Australia

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Smart control of energy distribution grids over heterogeneous communication networks

Smart control of energy distribution grids over heterogeneou...

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International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace and Electronic Systems Technology (Wireless VITAE)

作者： Rasmus L. Olsen Florin Iov Christian Hägerling Christian Wietfeld Department of Electronic Systems Networking and Security Aalborg University Denmark Department of Energy Technology Aalborg University Denmark Christian Wietfeld TU Dortmund University Germany

The expected growth in distributed generation will significantly affect the operation and control of todays distribution grids. Being confronted with short time power variations of distributed generations, the assurance of a reliable service (grid stability, avoidance of energy losses) and the quality of the power may become costly. In this light, Smart Grids may provide an answer towards a more active and efficient electrical network. The EU project SmartC2Net aims to enable smart grid operations over imperfect, heterogeneous general purpose networks which poses a significant challenge to the reliability due to the stochastic behaviour found in such networks. Therefore, the key concepts of the EU project SmartC2Net are presented in this paper targeting the support of proper smart grid control in these network environments. An overview on the required ICT architecture and its functionality is provided and a description of the External Generation Site Use Case is given together with the targeted evaluation approaches.

关键词： density estimation robust algorithm Communication networks Smart grids Monitoring Reliability Control systems Wide area networks

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Advanced decentralized DER control for islanded microgrids

Advanced decentralized DER control for islanded microgrids

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Australasian Universities Power Engineering Conference, AUPEC

作者： M. J. Hossain J. Lu M. A. Mahmud T. Aziz Queensland Micro and Nanotechnology Centre Griffith University Gold Coast Australia School of Software and Electrical Engineering Swinburne University of Technology Melbourne Australia Faculty of Engineering American-international University-Bangladesh Dhaka Bangladesh

Voltage and frequency regulations are main requirements for autonomous operation of an isolated microgrid with electronically interfaced distributed energy resource (DER) units. This paper presents a robust decentralized control design scheme for a multi-DER microgrid to enhance its voltage and frequency regulations. The proposed control scheme utilizes linear quadratic (LQ) decentralized control scheme to design controllers, which are robust to the uncertainty in the network and system nonlinearities. The effectiveness of the proposed controller is demonstrated through simulation on a test system, with complete nonlinear models, for large disturbances. It is found that the designed controller provides excellent performance during transient periods as well as restores the pre-disturbance steady-state operation within prescribed time frame.

关键词： Microgrids density estimation robust algorithm Voltage control robustness Mathematical model Educational institutions Uncertainty

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GRID4EU-Nice Grid project: How to facilitate the integration of Distributed Energy Resources into the local grid?

GRID4EU-Nice Grid project: How to facilitate the integration...

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Saudi Arabia Smart Grid Conference (SASG)

作者： R. Garaude Verdier GRID4EU Coordinator France

GRID4EU is one of the biggest smart grid projects to be funded by the European Union (27 partners, €54M budget). It comprises 6 demonstrators. The French one is Nice Grid which is a pilot project on photovoltaic-powered neighborhoods funded by the French government and the European Union. Nice Grid is located in the city center and the industrial area of Carros, a medium-sized town close to Nice on the French Riviera. This region is at the far end of high-voltage transmission lines, which creates a weakness in the electricity supply and in the local grid's stability and reliability. The area is also endowed with major sources of renewable energy, most notably solar energy. Nice Grid tests the entire smart grid concept, including the impact of the massive integration of Distributed Energy Resources (DER) on the low voltage grid with respect to constraints and flexibility programs.

关键词： Cities and towns Smart grids Europe density estimation robust algorithm Low voltage Photovoltaic systems

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A review on optimal sizing and siting of distributed generation system: Integrating distributed generation into the grid

A review on optimal sizing and siting of distributed generat...

引用

IEEE Power India Conference

作者： Peeyoosh Gupta Manjaree Pandit D. P. Kothari Indian Railways Centre for Advanced Maintenance Technology Gwalior India Department of Electrical Engineering MITS Gwalior India Director-Research WCEM Nagpur India

The non-conventional resources like sun and wind are never-ending, reliable and pollution less sources of power. When such limited size renewable sources situated close to load centers are used for generating power, they are termed as distributed energy resources (DER) or Distributed Generation (DG). After the Kyoto protocol on climate change there is thrust to preserve depleting reserves of conventional fuels i.e. coal and petroleum. One of the ways to achieve the same is through integrating these DER into the present electric supply system. The DER can be used in isolation or in integration with the existing system. Integration of DER with the grid supply helps to provide continuous supply of electricity with overall improvement in the system performance. The capacity sizing and siting (also called location allocation) of the DG is an important consideration for economic operation with lowest investment. It is a large scale non linear multi-objective constrained optimization problem with high dimension and practical constraints. A review on optimal sizing and siting of DG system has been attempted in this paper. The various solution techniques and objective functions along with various constraints applicable for the solution of optimal sizing and siting problem of DG are discussed and compared in this paper.

关键词： Distributed power generation Optimization Reliability Linear programming density estimation robust algorithm Power system reliability Genetic algorithms

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Applications of Virtual Power Plants approaches

Applications of Virtual Power Plants approaches

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International Conference and Exposition on Electrical and Power Engineering (EPE)

作者： Lucian Ioan Dulau Mihail Abrudean Dorin Bica Department of Automation Technical University of Cluj-Napoca Cluj-Napoca Romania Department of Electrical and Computer Engineering “Petru Maior” University of Tîrgu-Mureş Tîrgu-Mureş Romania

ISBN: (纸本)9781479958504

The paper highlights the main characteristics of Virtual Power Plants (VPP). A Virtual Power Plant is a cluster of distributed generation units (such as photovoltaic power plants, wind turbines or small hydro) and any other sources of power that can cooperate together in the local area, and are controlled by a central control entity. An analysis of a VPP that is used to cover the load is performed for the whole day. The distributed generators from the VPP have different merit orders and outputs. Another analysis is performed for a power system in which a VPP is added. The analysis compares the power flow for the situations with and without the VPP.

关键词： Generators density estimation robust algorithm Photovoltaic systems Wind turbines Load flow

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Interconnected microgrids via back-to-back converters for dynamic frequency support

Interconnected microgrids via back-to-back converters for dy...

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Australasian Universities Power Engineering Conference, AUPEC

作者： Julius Susanto Farhad Shahnia Arindam Ghosh Sumehda Rajakaruna Department of Electrical and Computer Engineering Curtin University Perth Australia

This paper presents the back-to-back interconnection of two autonomous microgrids. A back-to-back converter topology, referred to as an interchange converter, is used to provide dynamic frequency support for each autonomous microgrid. The proposed interchange converter facilitates active power exchange between the two microgrids when one cluster does not have sufficient generation capacity to supply its local load demand. During an overloading in the first microgrid, the output power of the energy resources within the other microgrid increases to supply the loads in the first microgrid. Hence, the frequency in both microgrids is kept within the acceptable range. Several study cases are simulated in DIgSILENT Power-Factory software to investigate and verify the successful dynamic frequency support by the help of the interchange converter.

关键词： Reactive power Frequency conversion Generators Microgrids Voltage control density estimation robust algorithm Voltage measurement

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A gain-scheduled decoupling control strategy for enhanced transient performance and stability of an islanded active distribution network

A gain-scheduled decoupling control strategy for enhanced tr...

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IEEE General Meeting Power& Energy Society

作者： Aboutaleb Haddadi Amirnaser Yazdani Geza Joos Benoit Boulet Electrical and Computer Engineering McGill University McGill University Montreal QC CA

Summary form only given. This paper proposes a control strategy to enhance transient performance and stability of a droop-controlled active distribution network. The dependency of dynamics on the droop gains, steady-state power flow, and network/load is studied in a droop-controlled distributed energy resource (DER) unit. These dependencies result in poor transient performance or even instability of the network in the event of a disturbance in the system. To eliminate these dependencies, a gain-scheduled decoupling control strategy is proposed which reshapes the characteristics of conventional droop by means of supplementary control signals; these control signals are based on local power measurements and supplement the d- and q-axis voltage reference of each DER unit. The impact of the proposed control on the DER and network dynamics is studied by calculating the eigenvalues of a test active distribution system assuming proposed control. The proposed control is shown to stabilize the system for a range of operating conditions. The effectiveness of the proposed control is further demonstrated through simulations carried out in the PSCAD/EMTDC software environment, on the active distribution system under study.

关键词： Transient analysis density estimation robust algorithm Stability analysis Computers Educational institutions Dynamic scheduling Steady-state

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