Stator-flux-oriented control of a doubly-fed induction machine with and without position encoder

Tlie control of a doubly-fed induction machine (DFM) with aid without tlie use of a rotor position encoder is examined. First, a stator fliix linkage oriented control scheme for power and speed control, with a position encoder, shows the high performance control capabilities of this control arrangement and serves as foundation for the sensorless scheme. The power-control method is then applied to a sensorless method, based on a previous control arrangement. This method is then exteiideci to derive a sensorless speed-control mechanism for the DFM. All control schemes are iniplenicntcd and pertbimcd on an experimental test system, comprising two 8OC167 microcontrollers and a 2.251tW wound rotor induction machine.