Grid synchronization of brushless doubly fed asynchronous generators in wind power systems

Document Type : Original Article

Authors

1 Federal University of Santa Catarina, Florianopolis, Brazil.

2 Federal Technical University of Parana, Ponta Grossa, Brazil.

Abstract

Abstract:
The vector control of the Brushless Doubly Fed Induction Generator (BDFIG) was
implemented in Matlab/Simulink/SymPowerSystems using a rotating reference frame
fixed on the power winding flux. The control algorithms of the grid-side and controlside
converters can regulate the active and reactive power independently. The measure
of the power winding flux angle, realized using a PLL, showed good performance
during the system startup and has demonstrated a robust behavior under noisy voltage
and current signals. A synchronization strategy is proposed that acts on the control-side
converter current control loops to ensure the conditions for a smooth connection. Soft
and fast synchronization is achieved at the minimum rotating speed. To validate the
simulated results an experimental setup with a Doubly Fed Induction Generator with
brushes was tested with the same control strategy and the experimental results showed
coherent with the simulated ones.

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