Search results for "current"

showing 10 items of 2224 documents

Online optimization of a multi-conversion-level DC home microgrid for system efficiency enhancement

2017

In this paper, an on-line management system for the optimal efficiency operation of a multi-bus DC home distribution system is proposed. The operation of the system is discussed with reference to a distribution system with two conversion stages and three voltage levels. In each of the conversion stages, three paralleled DC/DC converters are implemented. A Genetic Algorithm performs the on-line optimization of the DC network’s global efficiency, generating the optimal current sharing ratios of the concurrent power converters. The overall DC/DC conversion system including the optimization section is modelled using MATLAB/Simulink. Thanks to the implemented online algorithm, considering …

Engineering020209 energyGeography Planning and DevelopmentTransportation02 engineering and technologyPower conversion efficiencyRobustness (computer science)Control theoryMaster-slave control0202 electrical engineering electronic engineering information engineeringElectronic engineeringPeak shavingDC microgridOnline algorithmMATLABDC microgridscomputer.programming_languageCivil and Structural Engineeringbusiness.industryRenewable Energy Sustainability and the Environmentdc microgrids active droop control current sharing genetic algorithm master-slave control power conversion efficiency peak shavingEnergy conversion efficiencyConvertersSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaActive droop controlGenetic algorithmPeaking power plantMicrogridbusinessCurrent sharingcomputerVoltageSustainable Cities and Society
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An Adaptive Robust Predictive Current Control for Three-Phase Grid-Connected Inverters

2011

This paper presents an adaptive robust predictive current control (RPCC) for grid-connected three-phase inverters that exhibit zero steady-state current error. The error correction is achieved by means of an adaptive strategy that works in parallel with the deadbeat algorithm, therefore preserving the typical fast response of the predictive law. The resulting control adapts to any particular L or LCL filter by estimation of the resistive part of the filter. As a variety of the RPCC class of control, it offers the best tradeoff between robustness and speed. © 2009 IEEE.

EngineeringAdaptive controlThree-phase inverterGrid connected invertersElectric current controlElectric invertersTECNOLOGIA ELECTRONICAControl theoryRobustness (computer science)Active power filteringCurrent-controlled voltage source invertersFast responseElectrical and Electronic EngineeringActive filterAdaptive strategyActive filtersActive power filtering (APF)Power convertersbusiness.industryGrid-connectedPredictive current controlGridSteady-state currentsDeadbeat algorithmModel predictive controlCurrent-controlled voltage source inverter (VSI)Robust predictive current control (RPCC)Three-phaseControl and Systems EngineeringRobust controlLCL filtersError detection and correctionbusinessIEEE Transactions on Industrial Electronics
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S-domain modeling of conducting post in rectangular waveguides by the BI-RME method

2002

This paper describes the application of the Boundary Integral - Resonant Mode Expansion method to the modeling of a conducting post in a rectangular waveguide. The mathematical model of this structure is determined in a very short time, in the form of pole expansion of the Generalized Admittance Matrix in the s-domain. This model is very useful in the CAD of combline or interdigital filters.

EngineeringAdmittanceCurrent (mathematics)business.industryMathematical analysisStructure (category theory)Electronic engineeringBoundary (topology)CADDomain modelbusinessIntegral equationAdmittance parameters32nd European Microwave Conference, 2002
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Eddy current flaw detection with neural network applications

2005

Abstract Eddy current inspection is a fast and effective method for detecting and sizing most of the flaws in conducting materials. The inverse problem solution, i.e., inferencing about possible defect, based on the measurement signal from the eddy current probe, is a difficult task. In this paper an implementation of artificial neural networks for multi-frequency eddy current testing on conducting layers (aluminum, copper) and ferrous tubes has been presented.

EngineeringArtificial neural networkbusiness.industryApplied MathematicsAcousticsInverse problemCondensed Matter PhysicsSignalSizinglaw.inventionlawEddy-current testingEddy currentElectronic engineeringEffective methodElectrical and Electronic EngineeringbusinessInstrumentationMeasurement
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Monolithic integration of GMR sensors for standard CMOS-IC current sensing

2017

Abstract In this work we report on the development of Giant Magnetoresistive (GMR) sensors for off-line current measurements in standard integrated circuits. An ASIC has been specifically designed and fabricated in the well-known AMS-0.35 μm CMOS technology, including the electronic circuitry for sensor interfacing. It implements an oscillating circuit performing a voltage-to-frequency conversion. Subsequently, a fully CMOS-compatible low temperature post-process has been applied for depositing the GMR sensing devices in a full-bridge configuration onto the buried current straps. Sensitivity and resolution of these sensors have been investigated achieving experimental results that show a de…

EngineeringCmos asicHardware_PERFORMANCEANDRELIABILITY02 engineering and technologyIntegrated circuit01 natural scienceslaw.inventionApplication-specific integrated circuitlawHardware_INTEGRATEDCIRCUITSMaterials ChemistrySystem on a chipElectrical and Electronic Engineeringbusiness.industry010401 analytical chemistryElectrical engineering021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesElectronic Optical and Magnetic MaterialsCMOSInterfacingCurrent (fluid)0210 nano-technologybusinessSensitivity (electronics)Solid-State Electronics
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Analysis of ground fault current distribution along nonuniform multi-section lines

2008

In case of a substation supplied by a combined overhead-cable line, most of the ground fault current flows through the cable sheaths and discharges into the soil surrounding the point of discontinuity, where cables are connected to the overhead line. In the paper a new method is presented for computing the ground fault current distribution in case of feeding line consisting of two or more different sections, i.e. part overhead and part underground cable. Besides the calculation of the earth current at the fault location, the leakage current at the transit/transition stations as well as at the overhead line towers can be evaluated, in order to ensure proper safety conditions. Based on the tw…

EngineeringComputer programCurrent distributionbusiness.industryEarth currentElectrical engineeringEnergy Engineering and Power TechnologyFault (power engineering)Discontinuity (geotechnical engineering)Ground fault application transferElectrical and Electronic EngineeringbusinessGround fault currentComputer Science::Operating SystemsGroundingOverhead lineElectric Power Systems Research
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Wave Energy Assessment along Sicilian Coastline, Based on DEIM Point Absorber

2017

The use of renewable energy sources is one of the most relevant goals to be achieved in order to match the climate protection targets. As a case study, the paper shows the current electrical energy production by sources in the Sicilian context. Among the renewable energy sources, the paper investigates the wave energy potential along the Sicilian coasts, because of the favorable climate around the island. A point absorber is present in order to exploit this source. Two scenarios are presented, with two different levels of energy production.

EngineeringControl and OptimizationMeteorologyExploit020209 energyoffshore photovoltaicEnergy Engineering and Power TechnologyContext (language use)02 engineering and technologyCivil engineeringlcsh:Technology0202 electrical engineering electronic engineering information engineeringpoint absorberProduction (economics)Electrical and Electronic EngineeringEngineering (miscellaneous)SicilyRenewable Energy Sustainability and the Environmentbusiness.industrylcsh:TElectric potential energysea wave energy021001 nanoscience & nanotechnologyrenewable energylanguage.human_languageRenewable energyCurrent (stream)renewable energy; sea wave energy; point absorber; offshore photovoltaic; Sicilylanguage0210 nano-technologybusinessSicilianEnergy (signal processing)Energy (miscellaneous)Energies; Volume 10; Issue 3; Pages: 376
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Current-Sensing Technique for Current-Mode Controlled Voltage Regulator Modules

2008

This paper introduces an innovative current-sense technique for voltage regulator modules (VRMs). The proposed method is applied to a multiphase buck converter although the converter topology does not affect the accuracy or effectiveness of the proposed technique. A RC network is parallel connected with the buck converter low-side MOSFET and the voltage signal across the sense capacitor reconstructs the inductor current waveform. The RC technique benefits from all the advantages of the most popular current-sensing technique, the inductor DC resistance current-sense method, cutting off its main disadvantage. The sense network design is oriented to obtain high immunity to noise and a great dy…

EngineeringCurrent sensing Current sharing Multiphase buckconverteBuck converterbusiness.industryGeneral EngineeringBuck–boost converterĆuk converterElectrical engineeringVoltage regulatorInductorPower electronicsBoost converterElectronic engineeringRC circuitbusiness
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Currents Distribution During a Fault in an MV Network: Methods and Measurements

2016

When a single line to ground fault happens on the MV side of a HV/MV system, only a small portion of the fault current is injected into the ground by the ground-grid of the faulty substation. In fact the fault current is distributed between grounding electrodes and MV cables sheaths. In systems with isolated neutral or with resonant earthing this may be sufficient to provide safety from electric shock. Experimental measurements were performed on a real MV distribution network: a real single line to ground fault was made and fault currents were measured in the faulty substation and in four neighboring substations. In this paper the problem of fault current distribution is introduced, the tes…

EngineeringDistribution (number theory)020209 energyGlobal earthing system02 engineering and technologyglobal earthing systemsFault (power engineering)Industrial and Manufacturing EngineeringFault current limiter0202 electrical engineering electronic engineering information engineeringmedicineCurrent distributionElectrical and Electronic EngineeringElectrical conductorsingle line to ground faultglobal earthing systems (GESs)Current distribution electrical safety global earthing systems (GESs) grounding power distribution faults power system faults single line to ground fault (SLGF)business.industryGroundElectric shockElectrical engineeringpower system faultsgroundingmedicine.diseaseGridSingle linecurrent distribution; electrical safety; global earthing systems; grounding; power distribution faults; power system faults; single line to ground fault; control and systems engineering; industrial and manufacturing engineering; electrical and electronic engineeringSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPower system faultControl and Systems Engineeringsingle line to ground fault (SLGF)power distribution faultselectrical safetybusinessCurrent distribution; electrical safety; global earthing systems (GESs); grounding; power distribution faults; power system faults; single line to ground fault (SLGF); Control and Systems Engineering; Industrial and Manufacturing Engineering; Electrical and Electronic EngineeringPower distribution fault
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<title>Modeling of eddy current sensors</title>

2001

In this paper two models of eddy current sensor have been presented. They are base don a one- and multi-turn coil model. The results of computer simulations present a relation of eddy current density on nonferromagnetic conducting materials versus some parameters viz: a coil radius, frequency of excitation current and conductivity of material.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

EngineeringEddy-current sensorbusiness.industryOptical engineeringAcousticsBase (geometry)Electrical engineeringRadiusConductivitylaw.inventionExcitation currentElectromagnetic coillawEddy currentbusinessSPIE Proceedings
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