Search results for "Total Harmonic Distortion"

showing 10 items of 58 documents

A New Measurement Method for the Detection of Harmonic Sources in Power Systems Based on the Approach of the IEEE Std. 1459–2000

2010

In this paper, a novel single-point strategy is proposed for the detection of the harmonic sources in power systems. The method is an improvement of a strategy previously proposed by the authors; it is developed from the IEEE Std 1459-2000 approach and it can be entirely implemented in the time domain, thus simplifying the measurement system. The effectiveness of the proposed method is evaluated by introducing simple decision-making rules and by taking the presence of the measurement transducers into account. Several simulations and experimental tests are presented, showing that the enhanced strategy is able to give an useful information on the detection of the dominant harmonic source upst…

EngineeringTotal harmonic distortionbusiness.industrySystem of measurementEnergy Engineering and Power TechnologyAC powerlaw.inventionElectric power systemlawElectrical networkHarmonicElectronic engineeringUpstream (networking)Time domainElectrical and Electronic EngineeringbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheDetection of harmonic sources harmonic distortion IEEE Std. 1459–2000 power definitions power measurement power quality (PQ)IEEE Transactions on Power Delivery
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A PC-based wattmeter for accurate measurements in sinusoidal and distorted conditions: Setup and experimental characterization

2012

This paper presents the development of a high-accuracy sampling wattmeter, which can be employed with both sinusoidal and distorted input signals. The proposed personal computer (PC)-based system is a simple, portable, and low-cost solution because it is based on two commercial data acquisition boards connected to a common PC. Owing to this solution, the voltage is sensed directly, avoiding expensive voltage dividers, while the current is sensed by means of a noninductive current shunt. Commercial software is also used for data processing and implementation of the virtual instrument. The setup of the PC-based wattmeter is described, with a detailed description of the correction strategy of …

EngineeringVirtual instrumentExperimental evaluationMeasurement uncertaintyNon-inductive currentsInput signalHarmonic distortionElectric power measurementlaw.inventionPC-basedData acquisitionlawExperimental testElectronic engineeringData acquisition harmonic distortion personal computer (PC) -based instrument power measurement power system measurements wattmetersElectrical and Electronic EngineeringSignal samplingInstrumentationVoltage dividersTotal harmonic distortionLow-cost solutionVirtual instrumentationbusiness.industryAnalog to digital convertersData acquisition boardExperimental characterizationVoltage dividerElectrical engineeringData acquisitionMetrological performanceWattmeterAccurate measurementCommercial softwareElectric powerPersonal computersPower qualityPersonal computerPower system measurementMeasurement uncertaintyUncertainty analysisbusinessHigh-accuracySettore ING-INF/07 - Misure Elettriche E ElettronicheWattmetersVoltage
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Impact of integrating photovoltaic based DG on distribution network harmonics

2017

The process of integrating various distributed generation (DG) technologies in power system networks is increasing rapidly in the recent years. One major concern about the integration of DGs is their impact on network harmonics. The aim of this paper is to investigate the effects caused by the integration of photovoltaic DG in distribution networks on system harmonics. The penetration level, number of DG units, and their location are used as parameters in order to verify the effects of DG on system harmonics. Moreover, a study of single and double tuned filters is conducted as harmonics mitigation techniques. Detailed simulations using Matlab/Simulink are inserted in order to explain and ve…

Engineeringdistributed generationDistribution networksbusiness.industry020209 energyPhotovoltaic systemElectrical engineeringProcess (computing)02 engineering and technologyphotovoltaicSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaElectric power systemDG integrationHarmonicsDistributed generation0202 electrical engineering electronic engineering information engineeringElectronic engineeringtotal harmonic distortionbusinessMATLABcomputercomputer.programming_language
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Improvement of Hall Effect Current Transducer Metrological Performances in the Presence of Harmonic Distortion

2010

The performance of Hall effect current transducers (HECTs), under distorted waveform conditions, is usually characterized by means of a frequency response test. In this paper, it was investigated if frequency response is able to correctly evaluate the ratio and the phase errors under distorted conditions. Two HECTs, with the accuracy class level of 1% and 0.5%, respectively, were experimentally characterized under two conditions: 1) sinusoidal excitation with frequencies ranging from 50 to 750 Hz, which is the well-known frequency response test, and 2) nonsinusoidal excitation using fundamental frequency and one harmonic with adjusted amplitude and phase shift. It was found that ratio and p…

Frequency responseElectric current measurementCurrent measurement current transducer frequency response hall effect devices harmonic distortion power system harmonics.AcousticsTransducersPhase (waves)GyratorsNon-sinusoidal excitationHarmonic distortionAccuracy levelFundamental frequenciesHarmonic analysisPhase errorElectric currentsError compensationFrequency responseFrequency response testsWaveformSinusoidal excitationsPhase shiftElectrical and Electronic EngineeringInstrumentationPhysicsTotal harmonic distortionElectric power distributionHall effectCurrent measurementsMetrological performanceCurrent transducerFundamental frequencyLight measurementAmplitudeAccuracy classHarmonicsMagnetic field effectsHarmonicHarmonic amplitudeSettore ING-INF/07 - Misure Elettriche E ElettronicheDistorted waveformsHarmonic componentsHall effect devicesIEEE Transactions on Instrumentation and Measurement
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Frequency response of Measurement Current Transformers

2008

In this paper the frequency response of two CTs is experimentally evaluated in the range of 30-600 Hz. A theoretical analysis of CTs behavior has been developed by means of the equivalent circuit. It was shown, by an experimental test, that, for the frequency range analyzed, the transformer equivalent circuit is a valid tool for the evaluation of CT performances.

Frequency responseTotal harmonic distortionMaterials scienceTransducerlawPower system harmonicsElectronic engineeringEquivalent circuitIec standardsTransformerCurrent transformerHardware_LOGICDESIGNlaw.invention2008 IEEE Instrumentation and Measurement Technology Conference
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Graphical THD minimization procedure for single phase five-level converters

2017

This paper proposes two graphycal procedure to mitigate h harmonics and to minimize the total harmonic distortion (THD), respectively. The paper considers a five-level inverter and fundamental frequency modulation: it computes the two switching angles able to reduce low order harmonics and able to minimize the THD. Simulation results are obtained and, in order to validate the proposed procedure, an experimental prototype is built and experimental results are carried out. The comparison between simulation and experimental results confirms the accuracy of the proposed graphycal procedure. It is shown that the switching angles to mitigate the third-fifth and the third-fifth-seventh harmonics e…

Graphycal Procedure; Grid Codes; Harmonics Mitigation; Multilevel Inverters; Total Harmonic Distortion (THD); Electrical and Electronic Engineering; Control and Systems EngineeringGraphycal ProcedureTotal harmonic distortionEngineeringbusiness.industryTotal Harmonic Distortion (THD)020208 electrical & electronic engineeringModulation indexGrid Codes02 engineering and technologyFundamental frequencyElectronic mailHarmonic analysisHarmonics MitigationMultilevel InvertersControl and Systems EngineeringControl theoryHarmonics0202 electrical engineering electronic engineering information engineeringHarmonicElectronic engineeringInverterElectrical and Electronic Engineeringbusiness2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)
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Harmonic sources detection in power systems via nonactive power measurements according to IEEE Std. 1459–2010: Theoretical approach and ex…

2010

In this paper an enhanced decision-making strategy is presented for the detection of harmonic sources in power systems able to detect also which is the prevailing nature of the disturbance (nonlinearity or unbalance). It makes use of some simple indices, which are evaluated by means of the measurements of some nonactive power quantities, proposed by the authors and derived from the approach of the IEEE Std. 1459–2010. The decision-making rules for the proposed strategy are presented and discussed by means of simulation and experimental tests. The results obtained are presented, showing the effectiveness of the proposed strategy for the detection of the dominant harmonic source upstream or d…

Harmonic analysisElectric power systemEngineeringNonlinear systemTotal harmonic distortionbusiness.industryHarmonicElectronic engineeringMetering modeUpstream (networking)businessPower (physics)2010 IEEE International Workshop on Applied Measurements for Power Systems
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Assisted software design of a wide variety of windings in rotating electrical machinery

2014

In this paper a software developed by the Authors for winding design is presented. In particular, this software can be used as a valid aid in design and analysis for a wide variety of windings with generic number of phases, pole pairs, slot number, etc.. The calculation of winding factors and the evaluation of their harmonic distribution is also accomplished. The software is implemented in MATLAB® environment. By means of some examples, covering the most relevant winding types, the capabilities of this software will be shown. Particularly, integer and fractional slot, single and double layer winding, concentrated windings, imbrication, belt widening and belt shifting techniques can be treat…

Leakage inductanceEngineeringTotal harmonic distortionm.m.f.business.industryElectrical engineeringSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciwindingSoftwareharmonicMagnetomotive forceHarmonicsPhysics::Space Physicsflux densityWinding factorAstrophysics::Solar and Stellar AstrophysicsSoftware designwinding factorsdifferential leakagebusinessSettore ING-INF/07 - Misure Elettriche E ElettronichePhysics::Atmospheric and Oceanic PhysicsHarmonic distributionwinding connection
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A low cost and easy re-configurable instrument for power quality survey

2004

In this document the development of a low cost and user friendly PC-based instrument for power quality measurement is proposed, according to IEC 61000-4-7 and standard IEC 61000-4-30. It is an easily re-configurable instrument able to measure harmonics, interharmonics and amplitude disturbances and supply unbalance. In order to verify its accuracy, the instrument has been tested according standard test procedures, by means of a built-up calibration test bench.

Measure (data warehouse)Total harmonic distortionEngineeringUser Friendlybusiness.industryElectromagnetic compatibilityDiscrete Fourier transformsReliability engineeringspectral leakageHarmonicsCalibrationElectronic engineeringPower qualityFrequency estimationbusinessVoltageProceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510)
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Measurement Uncertainty of Harmonic Emission Indicators based on IEEE Std. 1459-2010

2020

The study presented in this paper is aimed at analyzing the measurement uncertainty impact on the evaluation of some power ratio parameters for harmonic emissions assessment based on IEEE Std. 1459-2010 apparent power decomposition. In addition to power factors for line utilization and harmonic pollution levels evaluation defined in the Standard, the study covers also some new parameters, which have been introduced by the authors as IEEE Std. 1459-2010 power quantities ratios. The measurement of the aforesaid parameters is implemented on a PC-based wattmeter, in order to investigate the measurement uncertainty impact on the evaluation of the power ratios. The obtained results show that, in …

Measurement uncertaintypower measurement02 engineering and technology01 natural scienceslaw.inventionlaw0202 electrical engineering electronic engineering information engineeringpollutionMedicineuncertainty analysisIEEE Std. 1459-2010Total harmonic distortionbusiness.industry020208 electrical & electronic engineering010401 analytical chemistryWattmeterpower qualityAC power0104 chemical sciencesReliability engineeringPower (physics)harmonic distortionPower definitionsHarmonic pollutionPower ratioharmonic analysisHarmonicMeasurement uncertaintybusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheHarmonic sources2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
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