Investigation and Suppression of Common-mode Resonance in High-power Transformerless Current-source Drives Systems Open Access
- Other title
Space Vector Modulation (SVM)
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Yunwei(Ryan) Li - Department of Electrical and Computer Engineering
- Examining committee member and department
Greg Kish - Department of Electrical and Computer Engineering
S. Ali Khajehoddin - Department of Electrical and Computer Engineering
Department of Electrical and Computer Engineering
- Date accepted
- Graduation date
Master of Science
- Degree level
Among high-power pulse-width modulation (PWM) current-source motor drives, the transformerless structure using the integrated dc choke to attenuate the common-mode (CM) voltage has been widely used due to the advantages of lower weight and costs without the isolation transformer. However, the CM inductor is still a heavy and costly component in such a system, and further scaling down the CM inductor without affecting the drive’s performance is always an important goal of the drive system design. As will be shown in this work, the size of the CM inductor is mainly related to the maximum CM current, which occurs under the resonant frequency of the CM circuit when motor speed is low. Also the potential CM resonance may be deteriorated with the implementation of power factor compensation (PFC) function in the drive. This thesis first conducts an in-depth study on the CM resonance, including the development of CM equivalent circuits, the influence of PFC on the CM resonance, and the relationship of CM choke size and CM current. Then active resonance suppression solutions are proposed in this work through modifying the PWM strategy of the high-power current-source converters. The working principles, CM voltage reduction performance, harmonic performance and switching frequency analysis of the proposed methods are presented. The investigation of CM resonance and the effectiveness of the proposed resonance suppression solution are verified by simulation and experiment.
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. 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.
- Citation for previous publication
Y. Lian, Y. Zhang, Y. W. Li, N. Zargari, and G. Cheng, “Common-mode Resonance Suppression in Transformerless PWM Current-Source Drive,” IEEE Transactions on Power Electronics, vol. 31, pp. 5721-5731, Aug. 2016.Y. Lian, Y. Zhang, Y. W. Li, G. Cheng and N. Zargari, “Common Mode Resonance Suppression in Transformerless CSI-fed Drive System”, in Conf. Rec. IEEE Energy Conversion Congress and Exposition (ECCE’15), Montreal, Canada, pp. 6573 - 6580 , 2015.Y. Lian, Y. W. Li, Z. Quan, N. Zargari, and G. Cheng, “SVM Strategies for Common-Mode Current Reduction in Transformerless Current-Source Drives at Low Modulation Index,” IEEE Transactions on Power Electronics, in press, 2016.
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