Abstract
When the brushless doubly-fed induction generator (BDFIG) connects to the power grid, the reactive power capacity of the BDFIG is an essential issue, especially when the grid voltage drops. In this paper, the active power and reactive power of the BDFIG are derived, the power region based on the power winding current and voltage, the control winding current and the rotor speed is analyzed, the capacity of absorbing the reactive power is constrained by the power winding stator current, while the output reactive power capacity of the BDFIG is dominated by the CW stator current. Furthermore, the gird-connected control method is developed, and the expected power is achieved. The simulation results verify the correctness of the control method and the reactive power tracking performance of the BDFIG.
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