Simulation of FLC Based Five-Level Inverter Fed Open-end Winding IM Drive

A fuzzy logic controller (FLC) based closed loop V/f control drive system for speed control of open-end winding induction motor fed by five-level inverter is proposed in this paper. In the proposed drive system one end of the open-end winding induction motor is fed by 3-phase, 3-level cascade inverter while the other end is fed by 3-phase, 2-level inverter to generates five-level in the motor phase voltage. A reverse mapping based space vector pulse width modulation technique is used to generate optimize switching signals for the devices to get required phase voltages. To achieving closed loop V/f speed control a fuzzy logic based auto tune controller is designed. The controller is capable of reducing undesirable sustained oscillations which are commonly occurred at low frequencies in constant V/f control variable speed induction motor drive. The complete drive system is simulated in MATLAB and results are presented for the entire speed range during both light and high load conditions.