Reactive power control of induction motor drive using chopper operated slip power recovery scheme

Wound rotor induction motors (WRIM) are more popular for starting and driving large industrial loads. WRIM are large sized AC motors having controlled starting and variable characteristics. Conventional speed control methods of WRIM have been rotor resistance control and slip power recovery scheme (SPRS) employing line commutated inverter control whereas the recent trends are towards PWM inverter and chopper control methods. The classification of chopper control methods are buck, boost, and buck-boost and further depends upon the semiconductor technology used for the switching devices e.g. SCR, GTO, MOSFET and IGBT. This paper presents the speed control of induction motor utilizing IGBT/MOSFET based buck-boost chopper controlled SPRS having improved performances. The performance parameters have been taken as reactive power and power factor. MATLAB/SIMULINK toolbox has been used to simulate the PWM inverter with IGBT/MOSFET based chopper controlled 2hp WRIM. Performance analysis of MOSFET and IGBT based chopper control techniques have been carried out and compared. From the simulation results it has been established that chopper control using IGBT semiconductor technology has better reactive power control and power factor than MOSFET.

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