Monografia (especialização)
Implementação de estratégias passivas para aumento da suportabilidade de aerogeradores DFIG
Fecha
2019-12-06Autor
Márcio Mateus Gonçalves
Institución
Resumen
The growth of the country, investments in the expansion of the electrical system
are becoming increasingly necessary. The generation model most used in
Brazil is based on hydroelectric power plants, despite being a source that does
not release pollutants into the atmosphere, generate a large environmental
impact at the time of its construction. Faced with the prospect many
investments are being made in the area of generation by thermal power plants,
solar and wind. The wind generation, to be renewed, fits perfectly in the
sustainable model, so recently discussed in our society. Technological
advances in this area are contributing to make deployment of this type of
development more technique/financial attractive, as well as causing less
environmental impact; modern wind turbines currently developed are able to
perform optimal control of reactive power and contribution to network
supportability at the point of connection. The development of these machines is
due to advances in power electronics since it was possible to control variables
such as active and reactive power in critical cases such as low-intensity winds.
In this respect it is essential that these machines contribute to the stability of the
system. For example, could be done with rate control system through the order
of active power and voltage levels while maintaining adequate control of
reactive power entered into the system. This work will be discussed the
turbine's behavior during the voltage sag. The main objective is to validate the
service to the network connection requirements. The most commonly used wind
generator topology is DFIG, where the stator circuit is directly connected to the
grid and the rotor connected to a back-to-back converter responsible for
controlling the variables. The use of the chopper circuit for protection of the DC
bus and Crowbar for protection of the rotor circuit will be exemplified. The study
is performed through simulated results of a representative model of a 2MW
system implemented in MATLAB / Simulink software.