| Abstract |
Doubly fed induction generators can improve wind energy conversion systems, since they are able to
generate controllable high power thanks to power converters with reduced rated power in comparison
with other variable speed wind generator technologies. Many structures for the electrical feeding of
the auxiliary winding may be considered. In this paper a classification of these structures are
presented and ordered according to the obtained control possibilities.
Then a wind doubly fed generator system whose wound rotor is connected to the grid via two back-toback
voltage source inverters is investigated. An equivalent continuous dynamic model of the global
system is presented in this paper and enables the control design. The control strategy consists in the
capture of the maximum available energy from the wind, the control of the reactive power, the power
quality of electrical variables and the control of the intermediary dc bus.
The proposed global model is simulated with the help of Matlab-Simulink™, by considering a 1.5
MW wind generator. The generation system is connected to a distribution network, which is
simulated with the help of the Sim Power System toolbox. The objectives are to evaluate technical
requirements, impacts and limitations of integrating distributed wind generation onto the electrical
distribution network. |
