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Extended Speed Range Control of an Open Winding Induction Motor Using a Dual Inverter Drive
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- Author / Creator
- Wdaan, Saeed
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The dual inverter drive (DID) using an open-ended winding induction machine has been regarded as a suitable topology for high speed applications. Some of the main advantages this topology has over the traditional single inverter drive is its multilevel voltage, its high reliability, and its voltage boost. The DID using a floating capacitor bridge topology has been in existence for a long period, but performance improvement is still possible in terms of its voltage utilization. The aim of this work is to further utilize the capabilities of this topology to improve the operation in the field weakening region.
This topology uses the floating capacitor bridge to supply the motor reactive power demand, whereas the bridge connected to the main power supply is usually operated at unity power factor. This limits the DID operation, especially in the field weakening region where the reactive power supplied to the motor defines the speed range in the field weakening region. The main contribution of this work is to extend the DID's speed range in the field weakening region, improve the motor speed acceleration performance, output power and torque by using the main bridge to supply some reactive power after the floating bridge reaches its maximum limit. It is found that the presented controller can increase the drive's speed extension ratio to 9.2 times the rated speed compared to 5 when always operating the main bridge at unity power factor. The motor maximum fundamental voltage is 1.82 p.u compared to that of a single inverter drive.
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- Graduation date
- Fall 2022
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Library with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.