PROJECT TITLE :
A Multi-Level Converter with a Floating Bridge for Open-Ended Winding Motor Drive Applications - 2016
This paper presents a 3-phase open-end winding induction motor drive. The drive consists of a 3-section induction machine with open stator part windings and dual-bridge inverter supplied from a single dc voltage source. To attain multilevel output voltage waveforms, a floating capacitor bank is employed for the second of the twin bridges. The capacitor voltage is regulated using redundant switching states at [*fr1] of the main dc-link voltage. This specific voltage ratio (two:one) is employed to form a multilevel output voltage waveform with three levels. A modified modulation scheme is used to improve the waveform quality of this twin inverter. This paper also compares the losses in the dual-inverter system in contrast with a single-sided three-level neutral purpose clamped converter. Finally, detailed simulation and experimental results are presented for the motor drive operating as an open-loop v /f controlled motor drive and as a closed-loop field-oriented motor controller.
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