Paper title: Modelling and Torque Estimation of an Inverse Connected
Cascaded WRIM in Rotor Reference Frame Operated with a Constant V/f
Ratio.
Authors names, affiliation:
1. Keerthi R Gopan, Department of Electrical Engineering, Indian
Institute of Technology, Delhi.
2. Shayak Chaudhuri, Department of Electrical Engineering, Indian
Institute of Technology, Delhi.
3. Amit Kumar Jain, Department of Electrical Engineering, Indian
Institute of Technology, Delhi.
Abstract: Wound-Rotor Induction Machines (WRIM) are extremely popular
for high-power applications both as industrial motor drives and
generators for harvesting wind-power energy.
However, these machines suffer from a major drawback due to the use of
slip-rings which require frequent replacements because of mechanical
damage. Cascaded WRIMs are slowly
becoming popular as an alternative for the conventional WRIM drives. In
the inverse connected cascaded configuration, the rotors of two WRIMs
are both mechanically coupled and electrically connected in reverse
phase-sequence. This completely eliminates the need to use slip-rings as
the rotors are not required to make electrical connections with any
stationary circuit. However, both the modelling and control complexity
of such a machine increases considerably. This paper aims to provide a
simple model for an inverse connected cascaded wound rotor induction
machine (ICC-WRIM) in the rotor frame of reference (FOR). The choice of
the reference frame is justified in the paper. Further, a torque
estimation technique using only the sensed stator currents is proposed.
The validity of the developed model and torque
estimation technique is established experimentally on a 7.4 kW
laboratory prototype of an ICC-WRIM.
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