Steady-state characteristics of DFIM : the potentialities ofintegration in electrical traction systems

Abstract

This article discusses doubly-fed induction machines integration possibilities in variable speed traction systems. The steady-state characteristics, performances and energy balance of a Doubly-Fed Induction Motor (DFIM) are studied and investigated. The novelty in our design lies in investigating the mechanical characteristics and the electrical performance of the DFIM based on the d - q model as a function of the magnitude, the phase angle and the slip related to the rotor voltage frequency. From this point of view, the main contributions of this study are: (i) a wide operating speed range, covering sub-synchronous and super-synchronous, (ii) a low ratio of rotor and stator voltage magnitudes and (iii) maximum torque and high-efficiency corresponding to the vehicle mechanical request. The paper presents detailed analysis and simulation results of some DFIM performances as a function of the voltage applied in its rotor windings. To show and approve the effectiveness and merits of the proposed DFIM in VSTS, a comparative study with induction motor is discussed, and experimental tests are provided through a DSP.