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Development of Slip Power Recovery Scheme sing Buck-Boost Chopper for Performance enhancement of Wound Rotor IM Drive

Sita Ram Bhardwaj, Y. R. Sood, O. P. Rah, Veena Sharma


This paper presents the mathematical modeling and testing of wound rotor induction motor drive (WRIMD) to develop the slip power recovery scheme (SPRS) using buck-boost chopper control techniques improving the performance of drive. The main focus of this research work is on the understanding of methodological development of Simulink model of SPRS. Various mathematical equations describing performance characteristics of WRIMD using SPRS with buck-boost chopper are derived. The performance parameters are taken as active power and reactive power required by induction motor, power factor, and efficiency of WRIMD. The ratings of components of SPRS i.e., transformer, diode bridge, inverter bridge, DC link inductor and buck-boost chopper are chosen considering 33% speed control range of WRIM below the synchronous speed. Different tests viz., open rotor, no-load, block rotor, and retardation tests are conducted on 3-phase, 2hp WRIM and open and short circuit tests on 3-phase transformer in the laboratory to determine the equivalent circuit parameters of WRIM and transformer for development of Simulink model. Ratings of the converter and inverter are selected based on the maximum value of the voltage and current fedback to the supply source and PIV ratings of diodes and thyristors. Ratings of the parts of buck-boost chopper are determined taking into account the minimum input voltage, maximum input voltage, nominal output voltage, maximum output current, and switching frequency of operation. The model of SPRS based IMD is developed in the Simulink using the parameters obtained from above tests conducted on induction motor and transformer.

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