Search results for "PV systems"

showing 10 items of 19 documents

Performance Evaluation of a Three- Phase Five-Level Quasi-Z-Source Cascaded H-Bridge for Grid-Connected Applications

2018

In the field of the PV generation, Quasi-Z-source cascaded H-bridge (qZS-CHB) inverters are promising due to their features of modularity and high voltage conversion ratio. Thus, new topology structures and innovative modulation techniques are continuously being developed to improve the performance in terms of voltage stress and harmonic content. This paper proposes an innovative modulation technique that allows reducing the voltage stress and a specially designed grid-connected control strategy is also introduced. Through simulations in MATLAB, it has been validated that the performance of a three-phase five-level qZS-CHB is improved with the proposed solution.

Computer science020209 energyEnergy Engineering and Power TechnologyTopology (electrical circuits)02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciPV systemsmodulation techniquesharmonicharmonics0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringMATLABcomputer.programming_languageQuasi-Z-source cascaded H-Bridge inverters020208 electrical & electronic engineeringHigh voltageH bridgeQuasi-Z-source cascaded H-Bridge inverterSettore ING-IND/31 - ElettrotecnicaThree-phasemodulation techniqueHarmonicsHarmoniccomputerPV systemVoltage
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Characterization of DC series arc faults in PV systems based on current low frequency spectral analysis

2021

Abstract This work presents an experimental study focused on the characterization of series arc faults in direct current (DC) photovoltaic (PV) systems. The aim of the study is to identify some relevant characteristics of arcing current, which can be obtained by means of low frequency spectral analysis of current signal. On field tests have been carried out on a real PV system, in accordance with some tests requirements of UL 1699B Standard for protection devices against PV DC arc faults. Arcing and non-arcing current signals are acquired and compared and the behavior of a set of indicators proposed by authors is analyzed. Different measurement equipment have been used, in order to study th…

Computer scienceApplied Mathematics020208 electrical & electronic engineering010401 analytical chemistryDirect currentPhotovoltaic systemArc fault detection Electrical safety Fault diagnosis PV systems Series arcs UL 1699B02 engineering and technologyCondensed Matter Physics01 natural sciencesSignal0104 chemical sciencesElectric arcArc (geometry)Data acquisition0202 electrical engineering electronic engineering information engineeringElectronic engineeringMetering modeElectrical and Electronic EngineeringCurrent (fluid)InstrumentationSettore ING-INF/07 - Misure Elettriche E Elettroniche
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Development of a big data bank for PV monitoring data, analysis and simulation in COST Action 'PEARL PV'

2019

COST Action entitled PEARL PV aims at analyzing data of monitored PV systems installed all over Europe to quantitatively evaluate the long-term performance and reliability of these PV systems. For this purpose, a data bank is being implemented that can contain vast amounts of data, which will enable systematic performance analyses in combination with simulations. This paper presents the development process of this data bank.

Computer scienceProcess (engineering)business.industryReliability (computer networking)Performance05 social sciencesPhotovoltaic systemBig dataData analysis050301 educationReliability7. Clean energyReliability engineeringPV systemsPEARL (programming language)Monitoring data0502 economics and businessData bankCost actionbusiness0503 educationcomputer050203 business & managementData monitoringcomputer.programming_language
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Modified Modulation Techniques for Quasi-Z-Source Cascaded H-Bridge Inverters

2018

Quasi-Z-source cascaded H-bridge (q Z S - C H B) inverters are one promising solution for high power photovoltaic (PV) systems. This type of topologies inherits the advantages of cascaded converters (i.e., multilevel outputs) and impedance-source inverters (i.e., high conversion ratios). In addition, it allows increasing the inverter reliability (with high redundancy). However, the modulation and control of qZS-CHB inverters are challenging to a certain extent. Thus, this paper proposes modified modulation techniques to increase the performances of qZS-CHB converters in terms of voltage gains and stresses. The novelty lies in the use of the switching frequency optimal as reference signals i…

Control and OptimizationComputer science020209 energyEnergy Engineering and Power Technology02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciNetwork topologyIndustrial and Manufacturing EngineeringModulation techniquePV systemsmodulation techniquesharmonicsquasi-z source cascaded h-bridge inverters0202 electrical engineering electronic engineering information engineeringElectronic engineeringRedundancy (engineering)Electrical and Electronic EngineeringQuasi-Z source cascaded H-Bridge inverter020208 electrical & electronic engineeringPhotovoltaic systemHarmonicH bridgeSettore ING-IND/31 - ElettrotecnicaModulationHarmonicsInverterPV systemVoltage
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The new course of FITs mechanism for PV systems in Italy: novelties, strong points and criticalities

2011

The paper deals with the new course of the Feed-in Tariffs mechanism for photovoltaic systems that will start from January 1, 2011 in Italy with the actuation of the Government Decree DM 06/08/2010. After a short introduction on Feed-in Tariffs and Net-metering in Italy, the paper focuses the attention on an economical comparison between the incentives established by the Government Decree DM 19/02/07, ended on December 31, 2010 and those introduced by the DM 06/08/2010. The economical comparison is based on three indexes: the Pay Back Period, the Net Present Value and the Internal Rate of Return, characterizing the investments done for the realization of the photovoltaic systems. In particu…

DecreeGovernmentEngineeringPayback periodPresent valuebusiness.industryPhotovoltaic systemInternal rate of returnSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaIncentiveEconomyRenewable Energy Resources PV systems Feed-in Tariffs PBP NPV IRR.Feed-in tariffbusinessIndustrial organization
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Optimization of photovoltaic energy production through an efficient switching matrix

2013

This work presents a preliminary study on the implementation of a new system for power output maximization of photovoltaic generators under non-homogeneous conditions. The study evaluates the performance of an efficient switching matrix and the relevant automatic reconfiguration control algorithms. The switching matrix is installed between the PV generator and the inverter, allowing a large number of possible module configurations. PV generator, switching matrix and the intelligent controller have been simulated in Simulink. The proposed reconfiguration system improved the energy extracted by the PV generator under non-uniform solar irradiation conditions. Short calculation times of the pro…

EngineeringMPPTPhotovoltaic modulesEnergy Engineering and Power TechnologyDynamic electrical schemeEnvironmental Science (miscellaneous)lcsh:Technologylcsh:HD72-88Maximum power point trackinglcsh:Economic growth development planningPV systemsGenerator (circuit theory)Matrix (mathematics)Control theoryGrid-connected photovoltaic power systemElectronic engineeringPV systems; Photovoltaic modules; Mismatch; Optimization algorithm; Reconfiguration; MPPT; Dynamic electrical schemeWater Science and Technologylcsh:TRenewable Energy Sustainability and the Environmentbusiness.industryPhotovoltaic systemControl reconfigurationControl engineeringPV systems Photovoltaic modules Mismatch Optimization algorithm Reconfiguration MPPT Dynamic electrical schemeSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaOptimization algorithmSettore ING-IND/31 - ElettrotecnicaMismatchReconfigurationInverterbusinessJournal of Sustainable Development of Energy, Water and Environment Systems
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Review of the energy and economic parameters involved in the effectiveness of grid-connected PV systems installed in multi-storey buildings

2014

Abstract The assessment of PV energy in an urban context is extremely complex because many factors have to be considered. Moreover, when the purpose is calculating the realistic amount of the electricity demand of a city that can be covered by the photovoltaic generation, it is necessary to estimate the number of photovoltaic systems whose installation is economically advantageous. Such a topic requires an economic analysis, which is affected by the number of energy and economic parameters involved and the values assigned to them to perform calculations. Some parameters are perfectly known and unvarying, like the paid incentives. Adversely, some parameters, like the efficiency degradation o…

EngineeringSettore ING-IND/11 - Fisica Tecnica Ambientalebusiness.industryMechanical EngineeringPhotovoltaic systemBuilding and ConstructionManagement Monitoring Policy and LawGridCivil engineeringEnergy policyReliability engineeringEconomic parametersGeneral EnergyIncentiveGrid-connected photovoltaic power systemEconomic analysisProfitability indexbusinessPhotovoltaic Grid-connected PV systems Energy parameters Economic parameters
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Design of Photovoltaic System for Rural Electrification in Rwanda

2017

Master's thesis Renewable Energy ENE500 - University of Agder 2017 In this century of accelerated development in various domains, some African countries are still facing a challenge of lack of power due to its scarce in some places, where by the main source of power (generation of electricity) is hydro since thermal and fuel are still on a small scale. This problem results in less productivity and economic decline of some countries like Rwanda which is among African countries that are at a very high speed in development, the grid lines from distant places are stack and they are few compared to the need of electricity in all corners of the country, especially in rural areas whereby each hous…

Grid linesVDP::Teknologi: 500::Elektrotekniske fag: 540::Elkraft: 542ENE500Off-grid PV Systemssolar home systemsmini-grid systemsRenewable EnergyRural electrificationHomer software
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REVIEW OF GUIDELINES FOR PV SYSTEMS PERFORMANCE AND DEGRADATIONS MONITORING

2018

35th European Photovoltaic Solar Energy Conference and Exhibition; 2037-2050

PV Systems - Performance Applications and IntegrationOperation Performance and Maintenance of PV Systems020209 energy0202 electrical engineering electronic engineering information engineering02 engineering and technology
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Economic and technical feasibility of a photovoltaic system in university building

2009

The use of renewable sources for electric power production can compensate the ever increasing energy demand in buildings. This article shows a study on the feasibility – both from the economic and technical point of view, of a photovoltaic system to be built on the premises of a university faculty. After a historical analysis on the building’s consumption – both on a yearly and monthly base, which highlights the need for an autonomous electric power production system, the difficult task of the technical optimization was undertaken with the aim of minimizing the impact or visual interference of the plant. A series of simulations allowed estimating the right compromise between producibility o…

PV systems economy payback time
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