Search results for "Power-flow study"

showing 10 items of 18 documents

A Virtual Tool for Load Flow Analysis in a Micro-Grid

2020

This paper proposes a virtual tool for load flow analysis in energy distribution systems of micro-grids. The solution is based on a low-cost measurement architecture, which entails low-voltage power measurements in each secondary substation and a voltage measurement at the beginning of the medium voltage (MV) feeder. The proposed virtual tool periodically queries these instruments to acquire the measurements. Then, it implements a backward&ndash

Control and OptimizationComputer scienceEnergy Engineering and Power Technologylcsh:TechnologyElectric power systemDistributed generatorPower-flow studyElectrical and Electronic Engineeringsmart gridEngineering (miscellaneous)Simulationdistributed generationRenewable Energy Sustainability and the Environmentbusiness.industrylcsh:TMicro gridPower (physics)Smart gridpower systemFlow (mathematics)Distributed generationload flowNode (circuits)micro-gridmeasurement uncertaintiesbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheEnergy (miscellaneous)Voltage
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LV Measurement Device Placement for Load Flow Analysis in MV Smart Grids

2016

This paper deals with the issue of measurement device placement for load flow analysis in medium-voltage (MV) distribution networks. The study is carried out using an innovative measurement algorithm for load flow analysis developed by the authors. It is based on low-voltage (LV) load power measurements applied on a backward/forward algorithm for the load flow resolution. The final aim is to identify the most suitable number and placement of the LV measurement points in order to limit the uncertainty on the power flow estimation to a target value. The proposed approach is based on the uncertainty evaluation of the estimated power flows; a sensitivity analysis is performed in order to assess…

Engineering020209 energy02 engineering and technologyPower factormeter placementpower system monitoringControl theorysmart grids0202 electrical engineering electronic engineering information engineeringElectronic engineeringpower measurementsPower-flow studySensitivity (control systems)Electrical and Electronic EngineeringInstrumentationbusiness.industry020208 electrical & electronic engineeringpower quality analyzer (PQA)power system measurementsPower (physics)Smart gridload flow (LF) analysisFlow (mathematics)Advanced metering infrastructure load flow (LF) analysis meter placement power measurements power quality analyzer (PQA) power system measurements power system monitoring smart grids.Advanced metering infrastructureMeasurement uncertaintyAlgorithm designbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheIEEE Transactions on Instrumentation and Measurement
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A simplified approach for load flow analysis in MV smart grids based on LV power measurements

2017

This paper presents a simplified approach for load flow analysis in medium voltage (MV) distribution networks. It is a power summation Backward/Forward (B/F) algorithm, based on measurements of active and reactive powers at low voltage (LV) side of MV/LV distribution substations. The proposed solution allows achieving good accuracy, computational efficiency and fast convergence. In order to verify the algorithm performances, simulation studies are carried out in the case of a real test system, i.e. the distribution grid of Favignana Island (Mediterranean Sea, Italy). The compatibility between simulations results and power measurements at the MV bus bars of the generating substation shows th…

EngineeringBusbar020209 energyBiomedical EngineeringAdvanced metering infrastructure (AMI)Smart grid02 engineering and technologyload flow analysisControl theory0202 electrical engineering electronic engineering information engineeringElectronic engineeringPower-flow studyInstrumentationPower system monitoringbusiness.industry020208 electrical & electronic engineeringAC powerSmart gridPower system measurementSignal ProcessingLoad flow analysiAlgorithm designPower system measurementsDistribution gridPower quality analyzers (PQA)businessSettore ING-INF/07 - Misure Elettriche E ElettronicheLow voltageVoltage2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
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An Innovative Measurement Approach for Load Flow Analysis in MV Smart Grids

2016

This paper proposes a novel measurement procedure for load flow analysis in medium voltage (MV) smart grids. The new approach is based on power measurements at low voltage (LV) side of MV/LV distribution substations. Such measurements are carried out by means of power quality analyzers. If compared with the load flow methods based on measurements at the MV side, the proposed approach has a lower cost and it offers an equally reliable measurement system. The proposed algorithm takes the basic concept of the current summation backward/forward method; some modifications are introduced to use LV load powers measurements. To this aim, the MV/LV power transformer is properly modeled and taken int…

EngineeringGeneral Computer Science020209 energy02 engineering and technologyload flow analysispower system monitoring0202 electrical engineering electronic engineering information engineeringElectronic engineeringPower-flow studyMATLABSimulationcomputer.programming_languagebusiness.industrySystem of measurement020208 electrical & electronic engineeringAdvanced metering infrastructure load flow analysis power quality analyzer (PQA) power system measurements power system monitoring smart grid (SG).AC powerpower quality analyzer (PQA)power system measurementsPower (physics)smart grid (SG)Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSmart gridAdvanced metering infrastructurebusinesscomputerLow voltageSettore ING-INF/07 - Misure Elettriche E ElettronicheVoltage
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New Measurement Procedure for Load Flow Evaluation in Medium Voltage Smart Grids

2013

The aim of this paper is to present a new approach for the medium voltage (MV) distribution network load flow analysis, mainly based on power measurement at the low voltage (LV) level of MV/LV distribution substations. This allows to use measurement instruments, usually already installed in the secondary substations, thus achieving an equally reliable measurement system with a lower cost compared to measurements at the MV side. The new approach can be applied using a proper communication system to collect the nodal measurements and an iterative algorithm based on ladder iterative technique (LIT) to compute the load flow. The validity of this method is presented and discussed on the basis of…

EngineeringIterative methodbusiness.industrypower system measurementSystem of measurementSmart grid (SG) power system measurements load flow power quality analyzer (PQA) state estimation (SE) advanced metering infrastructure (AMI)substations.Communications systemautomatic meter readingpower distribution reliabilityPower (physics)Settore ING-IND/33 - Sistemi Elettrici Per L'Energiasmart power gridsSmart gridElectronic engineeringload flowiterative methodsPower-flow studybusinessLow voltageSettore ING-INF/07 - Misure Elettriche E ElettronicheVoltagepower system state estimation
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Study of the Audio Susceptibility in Parallel Power Processing With a High-Power Topology

2009

In this paper, the audio susceptibility characteristic of a high-efficiency nonisolated topology that processes only a part of the total power delivery is analyzed. Since the proposed topology presents a direct path from input to output, the effect of the input voltage ripple at the output voltage has been studied. The effect on the audio susceptibility of the values and disposition of the components and the effect of their parasitic elements must be taken into account. Due to this study, the analytical expression of the audio susceptibility and the design criteria to improve it have been obtained.

EngineeringParallel processing (DSP implementation)business.industryPower electronicsRippleElectronic engineeringTopology (electrical circuits)Power-flow studyElectrical and Electronic EngineeringbusinessExpression (mathematics)VoltagePower (physics)IEEE Transactions on Power Electronics
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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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Steady-state security analysis on the transmission grid for various scenarios of wind generation in Sicily

2009

The proposed paper is part of a research aimed at assessing the impact of wind generation on the transmission grid of Sicily, second among the Italian regions for wind power installed. After describing the current state of wind energy generation in Sicily, the paper reports and comments the results of the steady-state security analysis done for various scenarios of wind penetration. For each scenario (maximum and minimum load conditions), the redistribution of power flows on the transmission network, the voltage profiles at nodes, the analysis of contingencies and losses variations are reported.

EngineeringSecurity analysiswind generationWind powerbusiness.industryGridSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaElectricity generationTransmission networkMesh generationElectronic engineeringPower-flow studybusinessSteady-state security analysiMarine engineeringVoltage
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Controlled Fault-Tolerant Power Converters for Power Quality Enhancement

2013

Power quality depends generally on the interaction of electrical power with electrical equipments. If electrical equipments operate correctly and reliably without being damaged or stressed, a suitable level of power quality is assured. On the other hand, if the electrical equipment malfunctions, is unreliable, or is damaged during normal usage, power quality is poor and probably the economical loss could be important like the technical one. In the scenario of the Distributed Generation, power quality issues will be moreover important because an higher dissemination of power conditioning equipment will be requested and this obviously increases the sources of vulnerability of the electrical s…

EngineeringSwitched-mode power supplypower supply qualitypower system controlSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciPower budgetpower quality enhancementTopologyMaximum power point trackingfault tolerant power converterfuel cellpower supplieElectric power systemMathematical modelpower convertorElectronic engineeringcontrolled fault-tolerant power converterPower-flow studyCircuit faulthybrid power systemdistributed generationFault tolerant systembusiness.industryFault toleranceReliability engineeringPower ratingBase load power plantPower qualityModeling and Simulationpower conditioning equipmentElectric powerVectorbusinessfault tolerance;power convertors;power supply quality;controlled fault-tolerant power converters;distributed generation;fault tolerant power converters;power conditioning equipment;power quality enhancement;Circuit faults;Fault tolerance;Fault tolerant systems;Mathematical model;Power quality;Topology;Vectors;fuel cells;hybrid power systems;power supplies;power system control
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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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