Abstract
In this paper the doubly fed induction machine (DFIM) is supplied by two pulse width modulation (PWM) voltage inverters. The mixed control strategy proposed is divided into two parts: a variable structure control (VSC) as far as the electrical modes are concerned, and a general PI controller for the mechanical modes. It is linked with active power distribution between stator and rotor circuits. An original DFIM mathematical model is defined in a stator flux reference frame. Experimental results of transient and steady-state behaviour are presented. In this paper we focus our study to three operating ranges: the magnetizing range, step and steady-state speed response, load torque impact.
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