K.F. da Silva, M.A. Saidel, S.R. Silva, J.J.J.P. Franco, and J.A.S. Brito (Brazil)
Wind farm, wind turbine, power quality, variable speed, voltage disturbance, digital control.
This paper presents the simulations of wind parks with doubly fed induction generators under brazilian wind conditions and their interaction with the electric national grid. As the good wind resources are in remote areas, where the electrical system is weak with reduced short circuit power, a study of the impact in the power quality of an interconnected wind park is presented. Its described the engineering of a doubly fed induction generator (DFIG), with back-to-back PWM voltage-source converter with current controlled using vector-control strategies to independent control the generator active and reactive powers. The controllers for the static converters connected to the grid side and to the rotor side are designed in a digital approach with the objective of reducing the voltages dynamic instabilities during wind ramps and gusts. Different control strategies using speed control and grid active power control of the wind park turbine-generators are compared and its influence on the grid are discussed.
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