Master's Dissertation
DOI
10.11606/D.18.2013.tde-09052013-151315
Document
Author
Full name
Natália Moreira Jacob
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2013
Supervisor
Committee
Gonzaga, Diógenes Pereira (President)
Aguiar, Manoel Luís de
Creppe, Renato Crivellari
Title in Portuguese
Estudo do fluxo de potência de um gerador de indução de dupla alimentação atuando em um sistema de geração eólio-elétrica
Keywords in Portuguese
Escorregamento
Fluxo de potência
Sistema de potência
Turbina eólica
Abstract in Portuguese
Title in English
Study of variation of power flow of a doubly-fed induction generator acting on a wind power generation system
Keywords in English
Doubly-fed induction generator
Power flow
Power system
Slipping
Wind turbine
Abstract in English
The use of wind energy has been the subject of studies around the world in recent decades due to the incentives to search for power generation through alternative sources. The most widely used configuration has been the three blades with horizontal axis and upwind turbine, operating in variable speed with power limitation by varying the pitch angle, and using the doubly fed induction generator configuration. The variable speed operation with power limitation enable for maximum energy harvesting for different wind speeds and prevents the turbine exceeds its nominal power. The use of converters allows for control of the rotor currents, varying the speed, and stator reactive power, and assembling type back-to-back allows for the rotor energy flux to flow into and out of the grid. Mathematical modeling of the whole system was referenced in the synchronous reference frame with vector notation and oriented by the grid flux, simplifying the mathematical models. For installation of the drivers, were used the Internal Model Control and Active Damping methods. The assembly of the entire system for simulation was conducted on Matlab / Simulink, and its step to step is shown in this work. This study analyzes the energy flow of the system, from the energy harvest from de wind to the energy delivered to the grid. To reach this, flow analysis of active and reactive power of the system is done, using unity, inductive and capacitive power factor, for the most recurrent wind behaviors. Analysis are made about the operation regimes of the system, defined as the relationship between the power flows, concluding that the machine can operate as a generator or motor, mainly due to the variation of the wind intensity.