Coordinated reactive power control strategy based on the improved doubly fed induction generator

Abstract

This paper proposes an improved model of doubly fed induction generator with DC-Chopper and series dynamic braking resistor and a coordinated reactive power control strategy based on the improved model for enhancing the capability of low voltage ride through (LVRT) and reducing the configured capacity of reactive power compensation device. The coordinated control strategy is among rotor side converter, grid side converter and static synchronous compensator (STATCOM) installed at the point of common coupling. The simulation results show that the DC voltage and the rotor current can be limited within their nominal values and the rotor side converter is not out of service during a grid fault under the coordinated control strategy. The coordinated control strategy proposed is also compared with the traditional control method based on Crowbar technology in the simulation. Finally, considering the overall system performance, the coordinated control strategy based on the improved model is recommended.