Search results for "020208 electrical & electronic engineering"

showing 10 items of 482 documents

Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems

2018

In modern HV apparatuses the wide use of electronic converters, increase the stress on the involved insulation systems and thus affect the reliability of the whole power grid. Additionally, such non-sinusoidal voltage shapes contain high gradient flanks that create problems in the detection of partial discharge (PD) activity. The aim of this paper is to discuss the methodology on how to suitably approach PD detection in insulation systems exposed to various voltage waveshapes in general by comparing two different measuring systems. The first one, equipped with a resonant PD decoupler, designed specifically for detection at typical power electronic waveshapes and the other one, based on an a…

010302 applied physicsFrequency responseMaterials sciencebusiness.industrySystem of measurement020208 electrical & electronic engineeringElectrical engineering02 engineering and technologyConverters01 natural sciencesPower (physics)Settore ING-IND/31 - ElettrotecnicaReliability (semiconductor)Partial discharge0103 physical sciencesPartial discharge0202 electrical engineering electronic engineering information engineeringmeasurementElectronicsElectrical and Electronic Engineeringbusinesssquare voltage waveformsVoltageIEEE Transactions on Dielectrics and Electrical Insulation
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SiC MOSFET vs SiC/Si Cascode short circuit robustness benchmark

2019

Abstract Nowadays, MOSFET SiC semiconductors short circuit capability is a key issue. SiC/Si Cascodes are compound semiconductors that, in some aspects, show a similar MOSFET behaviour. No interlayer dielectric insulation suggests, in theory, Cascode JFETs as more robust devices. The purpose of this paper is to compare the drift and degradation of two commercial devices static parameters by exposing them to different levels of repetitive 1.5 μs short-circuit campaigns at 85% of its breakdown voltage. Short-circuit time has been set experimentally, and longer times result in catastrophic failure of MOSFET devices due to over self-heating. For this purpose, pre- and post-test short circuit ch…

010302 applied physicsMaterials sciencebusiness.industry020208 electrical & electronic engineering02 engineering and technologyDielectricCondensed Matter Physics01 natural sciencesAtomic and Molecular Physics and OpticsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSemiconductorCatastrophic failureRobustness (computer science)0103 physical sciencesMOSFET0202 electrical engineering electronic engineering information engineeringOptoelectronicsBreakdown voltageCascodeElectrical and Electronic EngineeringSafety Risk Reliability and QualitybusinessShort circuitMicroelectronics Reliability
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3D magnetic and thermal fields for in the transformer with homogenised amorphous C-core under high frequency

2017

010302 applied physicsMaterials sciencebusiness.industry020208 electrical & electronic engineeringElectrical engineering02 engineering and technology01 natural sciencesAmorphous solidlaw.inventionlaw0103 physical sciencesThermal0202 electrical engineering electronic engineering information engineeringEddy currentAmorphous metal transformerElectrical and Electronic EngineeringComposite materialbusinessTransformerPRZEGLĄD ELEKTROTECHNICZNY
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Partial discharge of gel insulated high voltage power modules subjected to unconventional voltage waveforms

2016

Performances and duration of the new generation of high voltage power electronic components are dependent on dielectric materials aim to insulating their internal terminals. The presence of defects, some due to faults generated during the manufacturing process, but also due to the internal design of layers and connections, can cause local enhancements of electric field and consequently possible activity of partial discharges phenomena or other effects (aging, tracking) that may result in reduction of device reliability. Furthermore, the usage of unconventional voltage waveforms, like square waves or pulse width modulated waves, additionally increases the electrical aging of the insulation s…

010302 applied physicsMaterials sciencebusiness.industryAcoustics020208 electrical & electronic engineeringElectrical engineeringHigh voltage02 engineering and technologyInsulated-gate bipolar transistor01 natural sciencesSettore ING-IND/31 - ElettrotecnicaReliability (semiconductor)Partial Discharge Gel insulation IGBTvisual_artInsulation systemPower module0103 physical sciencesElectronic componentPartial discharge0202 electrical engineering electronic engineering information engineeringvisual_art.visual_art_mediumbusinessVoltage2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
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Experimental Investigation of Efficiency Map for an Inverter-Fed Surface-Mount Permanent Magnet Synchronous Motor

2019

Losses in inverter-fed permanent magnet motors are underestimated by using analytical or numerical approach since additional losses due to extra harmonics of the frequency converter are normally skipped. Further, losses in switches and passive components of the converter and the effect of switching frequencies cannot be numerically taken into consideration. Loss-minimizing control and proper efficiency analysis of inverter-fed permanent magnet motors cannot be achieved if an efficiency map is built based on a numerical investigation of the motors alone. This works first reviews losses in a surface-mount permanent magnet synchronous motor (SPMSM) and frequency converters. The efficiency map …

010302 applied physicsPermanent magnet synchronous motorComputer science020208 electrical & electronic engineeringSwitching frequency02 engineering and technologyConverters01 natural sciencesControl theoryModulationHarmonicsvisual_artMagnet0103 physical sciencesElectronic component0202 electrical engineering electronic engineering information engineeringvisual_art.visual_art_mediumInverter2019 8th International Conference on Renewable Energy Research and Applications (ICRERA)
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The Role of Right Interpretation of Space Charge Distribution for Optimized Design of HVDC Cables

2019

In the field of high-voltage transmission systems, different degradation phenomena affect the reliability of the employed components. In particular, under dc stress, the space charge accumulation phenomenon is believed to be the most responsible of the dielectrics lifetime reduction. To measure the accumulated space charges in flat specimens, the pulsed electro-acoustic (PEA) method is one of the most used techniques. The working principle of the PEA cell is based on the acoustic waves propagation and detection. As is well known, the acoustic waves propagating in different means are partially transmitted and partially reflected. Therefore, the piezoelectric sensor of the PEA cell is subject…

010302 applied physicsPhysicsField (physics)Piezoelectric sensorPEA method020208 electrical & electronic engineeringhigh-voltage direct-current (HVdc)Charge (physics)modeling02 engineering and technologyMechanicsAcoustic wave01 natural sciencesSpace chargeSignalFinite-difference time-domain (FDTD) methodIndustrial and Manufacturing EngineeringSettore ING-IND/31 - ElettrotecnicaControl and Systems Engineering0103 physical sciences0202 electrical engineering electronic engineering information engineeringReflection (physics)space chargeSurface chargeElectrical and Electronic Engineering
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Identification of parameters and harmonic losses of a deep-bar induction motor

2017

High frequency harmonics from a frequency converter causes additional losses in a deep-bar induction motor. The harmonics have their own amplitude and phase with respect to the fundamental signal, but the harmonic loss is only dependent on the amplitude of harmonics. A deep-bar induction motor can be modelled by a triple-cage circuit to take skin effect into account. The triple cage circuit having many parameters could be estimated from a small-signal model of the machine by using Differential Evolution. The correctly estimated parameters make the triple-cage circuit valid in a wide range of frequencies. However, the triple-cage circuit is very complicated which makes it difficult to model …

010302 applied physicsPhysicsFrequency multiplier020208 electrical & electronic engineering02 engineering and technologyLC circuit01 natural sciencesHarmonic analysisComputer Science::Hardware ArchitectureComputer Science::Emerging TechnologiesControl theoryHarmonics0103 physical sciences0202 electrical engineering electronic engineering information engineeringHarmonicEquivalent circuitInduction motorLinear circuit2017 Seventh International Conference on Information Science and Technology (ICIST)
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Experimental comparison of two control algorithms for low-saliency ratio interior permanent magnet synchronous motors

2018

In this paper, an experimental investigation on the comparison between the Maximum Torque Per Ampere (MTPA) and the Field Orientation Control (FOC) algorithms for interior permanent magnet synchronous machines (IPMSMs) is described, analyzed and discussed. This investigation was carried out on a small-power IPMSM with low saliency ratio. More in detail, after a previous simulation study, the control techniques have been experimentally implemented and validated through means of a dSPACE® rapid prototyping system. The performances of the two algorithms have been evaluated and compared, obtaining interesting results.

010302 applied physicsRapid prototypingControl algorithmElectromagneticsPermanent magnet synchronous motorComputer scienceRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringlow saliency ratio motor02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesField oriented control algorithmmaximum torque per ampere control algorithmControl theoryMagnet0103 physical sciencesAutomotive Engineering0202 electrical engineering electronic engineering information engineeringTorqueInterior permanent magnet synchronous machineAmpereMaximum torque
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Enhanced loss model algorithm for interior permanent magnet synchronous machines

2017

This paper presents an experimental study on the impact of the parameter variations over the performances of a LMA (Loss Model Algorithm) designed for an IPMSM (Interior Permanent Magnet Synchronous Machine). In a previous work, the characterization was carried out by assessing, for several working conditions, the motor parameters that influence the motor efficiency. The proposed enhanced loss model algorithm is implemented in a rapid prototyping system and its performances, in term of efficiency, are compared with other control systems, obtaining promising results.

010302 applied physicsRapid prototypingInterior permanent magnet synchronous motorComputer science020208 electrical & electronic engineeringWork (physics)02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesDC motorTerm (time)Settore ING-IND/31 - Elettrotecnicaspeed control drive systemsMagnetControl system0103 physical sciences0202 electrical engineering electronic engineering information engineeringTorquepower loss minimizationSettore ING-INF/07 - Misure Elettriche E ElettronicheAlgorithmPermanent magnet synchronous machine2017 AEIT International Annual Conference
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Parameter sensitivity of flux-linkage based sensorless control for permanent magnet synchronous motors

2017

Sensorless control can be utilized to reduce cost, size and total complexity of a motor drive or enhance reliability of the system. This paper first presents a sensorless control algorithm for a surface permanent-magnet synchronous motor (SPMSM) based on estimated flux linkages and stator currents. Within the algorithm, rotor position error can be predicted by comparing the estimated currents with measured stator currents. Performance of the sensorless control based on flux-linkages and the dependency of the algorithm on motor parameters is then numerically investigated via simulations. It is found from the investigation that the accuracy of the method depends on the motor working condition…

010302 applied physicsRotor (electric)Computer scienceStator020208 electrical & electronic engineering02 engineering and technology01 natural sciencesFlux linkagelaw.inventionMotor driveDirect torque controlControl theorylaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringTorqueSensitivity (control systems)Synchronous motor2017 20th International Conference on Electrical Machines and Systems (ICEMS)
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