Output feedback control of doubly-fed induction generator based on multi-time scale model

A doubly-fed induction machine is an electrical asynchronous three phases machine with open rotor windings which can be fed by external voltages. In this paper a new control system of a doubly-fed induction generator based on multi-time scale model is presented. After established the detailed model, the simplified model based on the multi-time scale theory was given. In simplified model, it uses nonlinear feedback to transforms the system into two independent linear subsystems. Stator currents, voltages and rotor flux are introduced as control signals. Rotor currents measurements are not required. The output feedback robust controller is used to regulate primary side active and reactive current. Robustness properties with respect to rotor angle position measurement resistance variations are demonstrated by simulation. The simulation result assures that the simplified model based on multi-time scale is valid to design output feedback controller.