Current closed-loop control and field orientation analysis of an induction motor in six-step operation for railway applications

In railway traction drive systems, six-step operation is widely used for motors in a flux-weakening region. Traditional vector control algorithms in six-step operation cannot work effectively due to the limitation of a single degree of freedom. This study analyses the dq current coupling relationshi...

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Bibliographic Details
Published in:IET power electronics Vol. 12; no. 6; pp. 1462 - 1469
Main Authors: Fang, Xiaochun, Tian, Zhongbei, Li, Hua, Yang, Zhongping, Lin, Fei, Hillmansen, Stuart
Format: Journal Article
Language:English
Published: The Institution of Engineering and Technology 29.05.2019
Subjects:
angular velocity control
closed loop systems
current closed‐loop control
current control precision
dq current coupling relationship
dual‐mode control
electric current control
field orientation analysis
field orientation error
flux‐weakening region
induction motor
induction motors
machine vector control
motor parameters
permanent magnet motors
railway traction drive systems
railways
Research Article
single degree of freedom
six‐step operation
switching control strategy
switching systems (control)
traction motor drives
vector control algorithms
voltage amplitude
current control precision
vector control algorithms
traction motor drives
motor parameters
induction motor
induction motors
angular velocity control
six-step operation
dual-mode control
electric current control
railways
switching control strategy
field orientation error
closed loop systems
current closed-loop control
railway traction drive systems
dq current coupling relationship
field orientation analysis
single degree of freedom
voltage amplitude
machine vector control
switching systems (control)
flux-weakening region
permanent magnet motors
ISSN:1755-4535, 1755-4543
Online Access:Get full text
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Summary:In railway traction drive systems, six-step operation is widely used for motors in a flux-weakening region. Traditional vector control algorithms in six-step operation cannot work effectively due to the limitation of a single degree of freedom. This study analyses the dq current coupling relationship when the voltage amplitude is limited and applies a current closed-loop control strategy in six-step operation. This study proposes a proper switching control strategy to achieve a dual-mode control for induction motors in a full-speed region. The accuracy of field orientation is affected by changes in motor parameters and plays a key role in current control precision. This study analyses the effect of field orientation error on motor six-step operation. It is found that the proposed current closed-loop control strategy can correct the field orientation error and guarantee the motor current to track the reference precisely. A case study of a 5.5 kW experimental platform is presented to validate the control schemes.
ISSN:1755-4535
1755-4543
DOI:10.1049/iet-pel.2018.5854