4.4 Article

Model reference adaptive system based sensorless vector control scheme for a 36-pulse ac-dc converter fed 9-level cascaded H-bridge-inverter driven induction motor drive

Journal

IET POWER ELECTRONICS
Volume 14, Issue 3, Pages 706-716

Publisher

WILEY
DOI: 10.1049/pel2.12059

Keywords

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Funding

  1. J.C. Bose fellowship [RP03195]
  2. [RP03128]

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A new modular transformer-based 36-pulse ac-dc converter is proposed in this work to improve power quality in a medium voltage induction motor drive, with a 9-level cascaded H-bridge inverter applied on the drive side for enhanced performance. The paper also presents a modified model reference adaptive system for sensorless vector control, and utilizes a nearest level modulation scheme to operate a 9-level inverter at fundamental frequency over the entire speed range of the induction motor drive, confirmed through simulation and experimental results.
A new modular transformer based 36-pulse ac-dc converter for a cascaded H-bridge-inverter fed medium voltage induction motor drive is proposed in this work. The conventional multi-pulse ac-dc converter has only 18-pulses in its line input current with six output dc voltages, whereas, the proposed multi-pulse ac-dc converter has 36-pulses in its line current with six output voltages. Due to this, the proposed medium voltage induction motor drive has improved power quality at input end. A 9-level cascaded H-bridge-inverter is applied on drive side to boost the performance of medium voltage induction motor drive. A modified model reference adaptive system based speed sensorless vector control is presented in this paper. A nearest level modulation scheme is used to operate a 9-level inverter at fundamental frequency switching over the entire speed range of an induction motor drive. The performance of this drive is verified through both simulation and experimental results.

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