Abstract
Back to back (B2B) voltage source converter is used for HVDC system and ac drive system to control active-reactive power. In this paper reduced switch back to back converter is used for induction motor drive system which is operated in unity as well as leading power factor. Active and reactive power flow are independently controlled. The active power transfer is controlled by angle delta; where delta is angle between input phase voltage and rectifier fundamental voltage. Reactive power flow is controlled by controlling dc link capacitor voltage. DC link capacitor voltage is regulated using PI controller. Appropriate gate signals are generated adding dc-offset in sinusoidal pulse width modulation technique. Microchip dsPIC33EP256MU810 digital signal controller is used for generating gate signals for nine switch converter (NSC) made up of FGA25N120 IGBTs. MATLAB/Simulink and prototype experimental results are presented to validate proposed concept. By tracking overall industrial power factor; this NSC drive system can made to run at leading power factor improving overall industrial power factor.
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