Caracciolo di Torchiarolo, Luigi (2016) System identification of horizontal axis wind turbines. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: System identification of horizontal axis wind turbines
Caracciolo di Torchiarolo,
Date: 31 March 2016
Number of Pages: 97
Institution: Università degli Studi di Napoli Federico II
Department: Matematica e Applicazioni "Renato Caccioppoli"
Scuola di dottorato: Scienze matematiche ed informatiche
Dottorato: Scienze computazionali e informatiche
Ciclo di dottorato: 27
Coordinatore del Corso di dottorato:
Coiro, DomenicoUNSPECIFIED
Scherillo, FerdinandoUNSPECIFIED
Date: 31 March 2016
Number of Pages: 97
Keywords: wind turbines; system identification; aerodynamic characteristics
Settori scientifico-disciplinari del MIUR: Area 01 - Scienze matematiche e informatiche > MAT/08 - Analisi numerica
Date Deposited: 12 Apr 2016 14:45
Last Modified: 02 Nov 2016 12:55

Collection description

This thesis work is concerned with the identification of the aerodynamic characteristics, namely the lift and the drag coefficients of the airfoils placed along the blades, of horizontal axis wind turbines. A wind turbine is represented by a quite complex dynamic system, composed in turn by several subsystems, for example aerodynamic, mechanical and electrical. It operates in stochastic and turbulent wind conditions and it gives rise to several complex phenomena, for example aeroelastic and three dimensional effects, dynamic stall, interactions between blades and tower as well as with other turbines within wind farms, etc. There are several models, which represent the behaviour of a wind turbine. However, such models are characterized by the values that some curves assume. These curves must be suitably regulated [11] to obtain a better comparison between experimental data and the data produced by the mathematical model. The purpose of this regulation is represented by the possibility to include some corrections related to the physical phenomena that have not been described by the mathematical model. This regulation also allows for accounting for manufacturing errors during the production of the blades. The target of this work is precisely to find a reliable method which allows to calculate the aerodynamic curves of such wind turbines. However, the problem of system identification applied to wind turbines is hard to face. In fact, the causes underlying such difficulties, for example the low level of identifiability and collinearity among parameters, prevents the calculation of such parameters. The problem is described in details in chapter 4 together with some methods used to solve the identification problem of wind turbines. To this end a software package, written in MATLAB® [18] language, was created. This software implements the methods of system identification and calculates the required curves as described in chapter 4. To verify this software several tests were performed. Firstly, some tests using virtual experimental measurements have been performed to confirm the reliability of the generated curves. Then a test in which the identification is lost can be observed. The reasons that lead this software to gain a faulty solution or to not converge at all, instead of obtaining the real solution, are described in chapter 4. Finally other tests were conducted using the performance obtained from some experimental measurements in order to identify the aerodynamic characteristics of some real wind turbines.


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