Simulation and Control of Doubly - FED Induction Generator

Abstract

Wind energy plays an increasingly important role in the world because it is friendly to the environment. During the last decades, the concept of a variable-speed wind turbine (WT) has been receiving increasing attention due to the fact that it is more controllable and efficient, and has good power quality. As the demand of controllability of variable speed WTs increases, it is therefore important and necessary to investigate the modeling for wind turbine-generator systems (WTGS) that are capable of accurately simulating the behavior of each component in the WTGS. Therefore, the main focus will be on models of a grid-connected wind turbine system equipped with a 2MW/690 V doubly-fed induction generator (DFIG), which includes back-to- back power converter. In order to obtain satisfying output power from the WTGS, control strategies are also necessary to be developed. These control schemes include the grid-side converter control, the generator-side converter control. The grid-side converter controller is used to keep the DC-link voltage constant and yield a unity power factor looking into the WTGS from the grid-side. The generator-side converter controller has the ability of regulating the torque, active power and reactive power. Vector control scheme is used to control back-to-back PWM converters. The simulation verification of system will be performed in PSIM software.