Search results for " wind"

showing 10 items of 403 documents

Wind Turbine Mechanical Characteristics and Grid Parameters Influence on the Transient Voltage Stability of a Fixed Speed Wind Turbine

2008

This paper describes the effect of wind turbine mechanical characteristic of construction and grid parameters on the transient voltage stability of a fixed speed wind turbine (FSWT) connected to a simple grid. The model of FSWT has been developed in Matlab/Simulink. Using this model, a three-phase fault is applied close to the wind turbine (WT) and cleared by disconnecting the faulted line. The effects of mechanical construction of WT and of grid parameters on the voltage stability of this simple case are evaluated and discussed. The considered parameters are the inertia coefficient of the WT, the short-circuit power at the connection bus, the hub-generator resonant frequency, the wind spee…

Engineeringdynamic model pitch control system voltage stability investigation wind turbine.Wind powerbusiness.industryInduction generatorAC powerFault (power engineering)TurbineTransient voltage suppressorWind speedSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaControl theoryTransient (oscillation)business
researchProduct

Effects of Electrical Parameters of Induction Generator on the Transient Voltage Stability of a Fixed Speed Wind Turbine

2008

This paper describes the effect of electrical parameters of the induction generator on the transient voltage stability of a fixed speed wind turbine connected to a simple grid; the dynamic behavior of a wind turbine connected to the grid is examined. The model of the fixed speed wind turbine has been developed in the simulation tool Matlab/Simulink. Itpsilas composed by the induction generator, the shaft system, the aerodynamic model of the wind turbine rotor and the pitch control system. Using this model, a three-phases fault is applied close to the wind turbine and cleared by disconnecting the faulted line. The effect of different electrical parameters of the induction generator on the vo…

Engineeringdynamic model pitch control system voltage stability investigation wind turbine.Wind powerbusiness.industryStatorInduction generatorAerodynamicsTransient voltage suppressorTurbinelaw.inventionInductanceSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaPitch controlControl theorylawbusiness
researchProduct

ESTCube-1 in-orbit experience and lessons learned

2015

ESTCube-1 is a student satellite project lead by the University of Tartu, Estonia, and supported by the European Space Agency (ESA) via Plan for European Cooperating States (PECS). Development of ESTCube-1 has been a collaborative effort with many international partners. The satellite is shown on Figure 1 [1].

Engineeringta115ta213business.industrynanosatelliteCubeSatE-sailAerospace EngineeringPlan (drawing)satellite designelectric solar wind sailsatellitesESTCube-1AeronauticsSpace and Planetary ScienceAgency (sociology)Space techniquesSatelliteElectrical and Electronic EngineeringOrbit (control theory)Aerospace engineeringelectric solar wind sailsbusinessSpace researchIEEE Aerospace and Electronic Systems Magazine
researchProduct

Finite-element performance comparison of IPMSMs with unsymmetrical double-layer windings

2017

This paper presents a comparison of the performances between IPMSMs (Interior Permanent Magnet Synchronous Machine) with a symmetrical and with two different types of unsymmetrical windings. The aim is to demonstrate that the adoption of slightly unsymmetrical windings does not significantly affect the performances of the machines, both in terms of cogging torque and torque/load angle characteristics, providing also the advantage of a higher possibility of choice in terms of slot number/poles ratio. More in particular, an IPMSM model (named IPMSM-1) derived from a commercial geometry equipped with a symmetrical winding is analyzed by using a Finite Element Method (FEM) approach. The simulat…

Engineeringunsymmetrical windingsStatorCogging torque; FEM analysis; IPMSM; permanent magnets; unsymmetrical windings; Renewable Energy Sustainability and the Environment; Automotive Engineering; Electrical and Electronic EngineeringFEM analysisSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural scienceslaw.inventionHarmonic analysislaw0103 physical sciencesTorqueRenewable EnergyElectrical and Electronic Engineering010306 general physicsFEM analysi010302 applied physicsSustainability and the EnvironmentRotor (electric)business.industryRenewable Energy Sustainability and the EnvironmentElectrical engineeringCogging torquepermanent magnetsStructural engineeringCogging torqueFinite element methodIPMSMSettore ING-IND/31 - ElettrotecnicaElectromagnetic coilMagnetAutomotive Engineeringpermanent magnetunsymmetrical windingbusiness
researchProduct

Glossing wind names in Low German in Salisbury? A newly discovered text in London, British Library, Cotton Vitellius A.xii

2018

It's an essay investigating a text on the names of the winds in ms London, British Library, Cotton Vitellius A.xii (s. xi), where both Latin and vernacular names are given. The text may ultimately derive from Einhard's Life of Charlemagne (ch. 29), but it appears as a self-contained text in the form of a Class Glossary. Although inserted in a manuscript copied in England at Salisbury, the vernacular words of the text are not in Old English. The essay makes a case for a possible connection with Flanders, with the text being one of the very rare surviving specimen of the Old Low Franconian language.

English medieval manuscriptSettore L-FIL-LET/15 - Filologia GermanicaSalisbury CathedralFlanderOld Low FranconianNames of the winds
researchProduct

Second-order hydrodynamic effects on the response of three semisubmersible floating offshore wind turbines

2020

Abstract Floating structures have become the most feasible solution for supporting wind turbines when offshore wind project move to deeper water. In this paper, a hydrodynamic analysis of three different semisubmersible floating offshore wind turbines is carried out including second-order hydrodynamic effects. The three examined platforms are V-shaped semisubmersible, Braceless semisubmersible and OC4-DeepCwind semisubmersible and are used to support the NREL 5 MW reference wind turbine. The main objective of the present study is to investigate and compare the hydrodynamic response of the three different semisubmersible floaters in two water depths (100 m, and 200 m) under different load co…

Environmental Engineering020209 energyHydrodynamic loadsOcean Engineering02 engineering and technology01 natural sciencesTurbineTransfer functionSemisubmersible floating wind turbines010305 fluids & plasmas0103 physical sciences0202 electrical engineering electronic engineering information engineeringWind powerSecond-order wave loadsbusiness.industryTension (physics)Newman's approximationMooringOffshore wind powerDragEngineering and TechnologybusinessFloating platformQuadratic transfer functionGeologyMarine engineeringOcean Engineering
researchProduct

Yacht performance monitoring in real sailing conditions

2019

Abstract In this paper a multi-method approach is used to setup and validate a monitoring system applied to a small sailing boat during real sailing conditions. This monitoring system is able to transform the data coming from some typical devices installed on board into information about the deformed state of the boat. GPS, Wind Data Logger and cameras have been installed on the boat to measure its route and speed, the apparent wind velocity and direction and the positions of the crew members. These data are processed to determine the equilibrium of the boat and estimate the loads applied on it. Then, a CAD/FEM model calculates the effects of these loads on the boat shape. The resulting def…

Environmental EngineeringComputer scienceCrew020101 civil engineeringOcean Engineering02 engineering and technology01 natural sciencesGeneralLiterature_MISCELLANEOUS010305 fluids & plasmas0201 civil engineeringPhysics::Fluid DynamicsPhysics::Popular PhysicsSoftwareHullData logger0103 physical sciencesOn board monitoring systemSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeApparent windStrain gaugebusiness.industryComputer aided engineeringFinite element methodGlobal Positioning SystemSailing yachtbusinessMarine engineering
researchProduct

Transient response of a TLP-type floating offshore wind turbine under tendon failure conditions

2021

Abstract Among various types of floating offshore wind turbines (FOWTs), the tension leg platform (TLP) floating wind turbines have relatively small motions due to stiff tendons. Similar to TLP applications in the offshore industry, tendon failure may lead to deteriorated stability and large transient responses, which should be considered as part of accidental limit state (ALS) checks at the design stage of the TLP FOWTs. This paper takes the WindStar TLP system as a representative and investigates the transient effects of one-tendon failure on the system responses. A coupled numerical model is first established using the aero-hydro-servo-elastic simulation tool FAST. Subsequent numerical s…

Environmental EngineeringFloating offshore wind turbine (FOWT)Computer scienceNacelleTime domain analysis020101 civil engineeringOcean Engineering02 engineering and technology01 natural sciencesTurbine010305 fluids & plasmas0201 civil engineeringTendon failureTransient response0103 physical sciencesLimit state designTransient responseTension-leg platformTension leg platform (TLP)Wind powerbusiness.industryStructural engineeringCoupled aero-hydro-elastic modelOffshore wind powerAccidental limit stateTransient (oscillation)business
researchProduct

Evoluzione di una turbina eolica innovativa

Eolico microeolico turbina eolica fonti rinnovabili VAWT wind turbine
researchProduct

The Application of Different Model of Multi-Layer Perceptrons in the Estimation of Wind Speed

2012

Wind speed forecasting is essential for effective planning of wind energy exploitation projects. The ability to predict short-term wind speed is a prerequisite for all the operators of the wind energy sector. Consequently it is essential to identify an efficient method for forecasts. In this paper, the wind speed in the province of Trapani (Sicily) is modeled by artificial neural network. Several model of neural network were generated and compared through error measures. Simulation results show that the estimated values of wind speed are in good agreement with the values measured by anemometers..

EstimationArtificial neural networks multi-layer perceptrons wind speed predictionEngineeringWind powerArtificial neural networkMeteorologybusiness.industryAstrophysics::High Energy Astrophysical PhenomenaGeneral EngineeringPerceptronWind speedAnemometerPhysics::Space PhysicsAstrophysics::Solar and Stellar AstrophysicsbusinessMulti layerPhysics::Atmospheric and Oceanic PhysicsAdvanced Materials Research
researchProduct