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Improved Performance of CFTC-based Direct Torque Control of Induction Machines by Increasing Torque Loop Bandwidth
  • Alsofyani, Ibrahim Mohd ;
  • Lee, June Hee ;
  • Han, Byung Moon ;
  • Lee, Kyo Beum
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Publication Year
2018-10-22
Journal
2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
Publisher
Institute of Electrical and Electronics Engineers Inc.
Citation
2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018, pp.466-470
Keyword
Direct torque controlFlux regulationInduction motor
Mesh Keyword
Constant frequencyDirect torque controlFlux regulationFrequency carriersInduction machinesSampling frequenciesTorque controllersZero voltage vectors
All Science Classification Codes (ASJC)
Energy Engineering and Power TechnologyElectrical and Electronic Engineering
Abstract
Constant frequency torque controller-based direct torque control (CFTC-DTC) of AC motor drives is known to have limitation with torque loop bandwidth, since it uses sampling frequency available from a digital signal processor for generating triangular carrier-based waveform. The switching frequency of the control system is determined by the carrier frequency of CFTC. The worst case of CFTC-DTC drive exists at very low speed under light load where the zero voltage vectors are dominant, and the radial component of active voltage vectors are very short leading to flux droop at sector transitions. This results in the distortion of motor phase current and aggravation of speed waveform. This paper proposes a modification on the frequency carriers of CFTC to increase the torque loop bandwidth by replacing the triangular carrier-based with ramp carrier-based waveform. The proposed method is proven by the simulation results showing excellent performance of motor flux, phase current, and speed at low speed.
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/36337
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85057347580&origin=inward
DOI
https://doi.org/10.23919/ipec.2018.8507989
Journal URL
http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8476150
Type
Conference
Funding
ACKNOWLEDGMENT This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Futu re Planning [2016R1A2B4010636].
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