Search results for "Voltage optimisation"

showing 9 items of 9 documents

Power quality effects on the measurement of reactive power in three-phase power systems in the light of the IEEE Standard 1459–2000.

2007

Reactive power is a very important quantity in electric power systems since it affects the efficiency of these systems. Also, capacitive loads can produce over-voltages in electric transformers by Ferranti effect, which produces bad power quality, so it is necessary to measure the reactive power correctly. In this paper reactive phenomena in three-phase power systems with unbalanced voltages are expressed and measured in the light of the IEEE Std 1459-2000. For analyzing the reactive phenomena the positive-sequence fundamental frequency instantaneous reactive power is used. By comparing the expressions of this instantaneous power in three-phase systems with unbalanced voltages with those co…

Engineeringbusiness.industryPer-unit systemPower moduleElectrical engineeringPower factorSingle-phase electric powerPower-flow studyAC powerVolt-ampere reactiveVoltage optimisationbusiness2007 9th International Conference on Electrical Power Quality and Utilisation
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Estimation of power supply harmonic impedance using a controlled voltage disturbance

2002

A novel method for power system impedance estimation is presented. The method employs a power converter to inject a voltage transient onto the supply system. The impedance is estimated through correlation of the measured voltage and current transients. Simulations and experimental results demonstrate the effectiveness of this measurement technique.

High impedanceMaterials scienceSwitched-mode power supplyElectronic engineeringImpedance bridgingOutput impedanceHardware_PERFORMANCEANDRELIABILITYVoltage sourceVoltage optimisationDisturbance voltageNegative impedance converter2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230)
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A Technique for Power Supply Harmonic Impedance Estimation Using a Controlled Voltage Disturbance

2002

A method for power system impedance estimation is presented. The method employs a power converter to inject a voltage transient onto the supply system. As the technique employs controlled power electronic devices it may be used as a stand alone piece of a portable measurement equipment, or it may be embedded into the functions of an active shunt filter for improved harmonic control. The impedance is estimated through correlation of the measured voltage and current transients. Simulations and experimental results demonstrate the measurement technique is highly accurate and effective.

Engineeringindustrial power systemsSwitched-mode power supplybusiness.industryImpedance measurementImpedance bridgingHardware_PERFORMANCEANDRELIABILITYVoltage optimisationpower qualityElectric power systempower system measurements.Power electronicsElectronic engineeringVoltage sourceElectrical and Electronic EngineeringbusinessActive filterNegative impedance converter
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Comparison of power quality impact of different photovoltaic inverters- the viewpoint of the grid

2005

This paper presents the results of an experimental analysis performed with the aim of evaluating the effect of many photovoltaic plants on power quality of the grid. Several parameters as voltage and current distortion, flicker, voltage variations at fundamental frequency and power factor have been observed. The measured values have been compared with the limits reported in the standards and, when possibiIe, their dependence on the characteristics of the grid in terms of its impedance has been pointed out.

EngineeringSwitched-mode power supplybusiness.industryElectrical engineeringPower factorVoltage optimisationpower qualify distributed generation photovoltaic plantMaximum power point trackingSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaElectric power systemStand-alone power systemGrid-connected photovoltaic power systemElectronic engineeringbusinessNominal power (photovoltaic)2004 IEEE International Conference on Industrial Technology, 2004. IEEE ICIT '04.
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New Power Conditioning System for Battery-free Satellite Buses with Maximum Power Point Tracking

2007

The purpose of this paper is describe a new conception of Power Conditioning Unit (PCU) developed to fulfill the requirements of BepiColombo Electronic Propulsion module. This load bus has very tough specification especially regarding transient response during total load switch-off ("beam out") which has to be less than 2% of the bus voltage. The conception we propose, is the new Sequential Switching Shunt Maximum Power Regulator (S3MPR) consisting in a S3R, to keep the SA voltage at its Maximum Power Point (MPP) followed by a Boost regulator to produce a constant 100V to supply the Electronic Propulsion (EP). This concept may also be of interest for other future missions involving high pow…

EngineeringPower ratingSwitched-mode power supplybusiness.industryElectrical engineeringPower factorPower-flow studyPower supply unitVoltage optimisationbusinessMaximum power point trackingConstant power circuitAPEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition
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Effect of voltage deviations on power distribution losses in presence of DG technology

2015

Integration of distributed generation (DG) units in power distribution network has become increasingly attractive multi-faceted paradigm as economic and environmental factors drive new technologies to be more efficient and less polluting than their earlier counterparts. The installation of DGs impacts critically on the planning and operating characteristics of the distribution network. Type, location, number and capacity of DG are essential factors for studying the effect of DGs on the system behavior. In this paper the effect of DG on the power losses of a distribution network is investigated for different types of DG units. Also, the impact of DG on the voltage profile is demonstrated bef…

distribution systemElectric power distributionEngineeringbusiness.industryVoltage optimisationAC powerPower (physics)Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaDG integrationControl theoryvoltage profileDistributed generationElectronic engineeringVoltage regulationDistributed generationbusinessPower controlVoltage2015 International Conference on Renewable Energy Research and Applications (ICRERA)
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Reassessment of voltage stability for distribution networks in presence of DG

2016

There is a growing interest in integrating renewable energy based distributed generation (DG) in the electrical power distribution networks. The installation of DG units at distribution level impacts critically the planning and operation characteristics of the network. The type, location, number and capacity of the integrated DGs affects system behavior and performance. In this paper the effect of installing new DGs on the distribution network voltage stability is studied. The optimal location of the newly installed DGs are decided based on the Power Stability Index (PSI) and Voltage Stability Index (VSI). Moreover, Voltage Stability Margin (VSM) of the interconnected DG distribution networ…

Engineeringbusiness.industry020209 energyElectrical engineering02 engineering and technologyVoltage optimisationAC powerPower (physics)Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaElectric power systemDG integrationvoltage stabilityDistributed generationpower stability index0202 electrical engineering electronic engineering information engineeringElectric powerVoltage regulationDistributed generationbusinessPower control2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC)
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A New Method for the Price Determination of the Reactive Power Supply

2006

This paper addresses the development of an accurate model for the pricing of reactive power supply as an ancillary service. Reactive power supply is one of the most important ancillary services in the field of transmission systems security. The present work is focused on building a reactive power market at which the Distributors can also take part in injecting reactive power at the connected HV/MV nodes. The authors have studied the particular case of the reactive power supplied by sub-transmission or distribution networks, connected to the nodes of the transmission system. The aim of this work is to establish a reactive power price by crossing demand and offer curves.

Stand-alone power systemElectric power systemComputer scienceDynamic demandDistribution management systemPower-flow studyVoltage optimisationAC powerPower budgetAutomotive engineeringProceedings of the 41st International Universities Power Engineering Conference
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Influence of MV distribution networks structure on voltage dips propagation

2003

In this paper, transient behaviour due to voltage dips which occur in electric power MV distribution networks as a consequence of a fault by using an improved ATP circuit-breaker model are reported. The circuit-breaker is simulated by using a tool written in MODELS language and by arranging a time-variable differential arc-conductance based on the combination of Mayr's and Cassie's equations. An accurate analysis of the transient subsequent to circuit-breaker operation, in different fault conditions, are reported in order to show how the amplitude of the dip depends on the fault type, location and network structure.

EngineeringTransient recovery voltageElectrical loadbusiness.industryElectrical engineeringHardware_PERFORMANCEANDRELIABILITYPower factorVoltage optimisationFault (power engineering)TopologyConstant power circuitTransient (oscillation)businessVoltagePowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)
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