Open Ended Winding Motor Drive Using A Floating Bridge Multi-Level Converter

Abstract

This paper presents the use of a dual bridge inverter topology for an open ended winding induction motor drive. A three phase induction machine with open stator phase windings along with dual-bridge inverter supplied from a single dc voltage source together represents a drive. To accomplish multi-level output voltage waveforms a floating capacitor bank is utilized for the second of the dual extensions. The capacitor voltage is controlled utilizing excess switching states at half of the principle dc interface voltage. The primary controller (master controller) is designed as a Fuzzy logic controller. This specific voltage proportion (2:1) is utilized to make a multi-level output voltage waveform with three levels. An altered modulation conspire is utilized to enhance the waveform nature of this dual inverter. The most commonly used controller for the speed control of Induction Motor is Proportional Integral (PI) controller. PI controller has high starting overshoot, sensitivity to controller gains and sluggish response due to sudden disturbance. So, to overcome these problems, replacement of PI controller by fuzzy logic controller is proposed. At last, point by point simulation is exhibited for the motor drive working as an open loop v/f controlled motor drive and as a closed loop field oriented motor controller.