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A stochastic analysis of Turbulence Intensity influence over various sizes of HAWT: Study of hypothetical relationship between Rotor Diameter and influence level of Turbulence Intensity
Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Energy Science. allnic15@student.hh.se.
2016 (English)Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesisAlternative title
En stokastisk analys av turbulensintensitet inflytande över olika storlekar av HAWT : Studie av hypotetisk relation mellan rotordiameter och inflytande nivå turbulensintensitet (Swedish)
Abstract [en]

This disquisition aims for the study of turbulence intensity influence over the power performance of different sizes of turbines with the intent to validate a hypothesis. The hypothesis formulated for the analysis is the relationship between the rotor diameter (turbine size) and turbulence intensity. The hypothetical relationship is that the smaller turbines tend to experience more influence on the power performance from the turbulence in comparison with larger ones. For this examination, three different wind turbines of models Vestas V90, V100, V126 were chosen from three Swedish wind farms. The power performance of turbines at various levels of turbulence intensity were analyzed and the power deviation from the mean value due to influence of turbulence were assessed. The power deviation values of different turbines were compared at same level of wind speeds and also the power coefficients at same level of tip speed ratios were compared to validate the hypothesis. It was observed that the hypothesis seemed to appear true as higher influence on power curves were observed on V90 compared to others. Nevertheless, there were some obscene results which might be due to several factors such as influence of variation in hub height, site and inadequacy of data.

Abstract [sv]

Detta examensarbete syftar till att studera hur ett vindkraftverks storlek påverkar inflytande från turbulens på effektuttaget. Hypotesen är att vindkraftverk med mindre rotordiameter påverkas mer av turbulens än de större. Tre vindkraftverksmodeller (Vestas V90, V100 och V126) från svenska vindkraftsparker valdes ut. De olika modellernas effektuttag för olika grader av turbulens analyserades och avvikelsen från effektmedelvärdet jämfördes. Effektavvikelserna samt verkningsgradsavvikelsen  för de olika vindkraftverksmodellerna jämfördes vid samma vindhastighet respektive löptal för att kunna testa hypotesen. Hypotesen styrks då den mista modellen (Vestas V90) påverkas mest av turbulens. Resultatet har dock troligtvis påverkats av andra faktorer såsom tornhöjd, terräng och en begränsad mängd data.

 

Place, publisher, year, edition, pages
2016. , 66 p.
Keyword [en]
Turbulence intensity, power performance, power deviation, power coefficient, tip speed ratio.
Keyword [sv]
Turbulensintensitet, effektuttag, effektavvikelse, verkningsgrad, löptal
National Category
Energy Systems Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hh:diva-31096OAI: oai:DiVA.org:hh-31096DiVA: diva2:935617
External cooperation
Eolus Vind AB
Subject / course
Energy Technology
Presentation
2016-05-24, N104, Hus N, Linjegatan, 30250 Halmstad, 10:30 (English)
Supervisors
Examiners
Available from: 2016-06-22 Created: 2016-06-10 Last updated: 2016-06-22Bibliographically approved

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