Abstract

Doubly-fed induction machines (DFIMs) are widely used as wind generators. However, these machines can also be used in motor mode as electric propulsion systems in electric vehicles. This paper presents a detailed steady-state analysis of a DFIM. In this study, using the per-phase equivalent circuits and steady-state equations, a comprehensive analysis of the DFIM in motor operation mode is presented. The behavior of the motor in all three synchronous, super-synchronous, and sub-synchronous modes is analyzed and evaluated using the simulation results. Adjusting and controlling the rotor voltage is very essential. Therefore, a simple method for optimally adjusting the amplitude and angle of the rotor voltage is proposed for two different optimization scenarios that maximize output power and efficiency, respectively. According to the results, if the rotor voltage is properly selected, the DFIM can operate optimally at a wide range of speeds.

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