Analysis and implementation of a new method to retain the original speed and torque of synchronous reluctance motor during sustained voltage dip
- Author(s): Pradyumna Ranjan Ghosh 1 ; Anandarup Das 1 ; Gurumoorthy Bhuvaneswari 1
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View affiliations
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Affiliations:
1:
Department of Electrical Engineering , IIT Delhi , Hauz Khas , New Delhi 110 016 , India
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Affiliations:
1:
Department of Electrical Engineering , IIT Delhi , Hauz Khas , New Delhi 110 016 , India
- Source:
Volume 13, Issue 9,
September
2019,
p.
1365 – 1377
DOI: 10.1049/iet-epa.2019.0100 , Print ISSN 1751-8660, Online ISSN 1751-8679
This study presents the operation of a synchronous reluctance motor drive under a sustained voltage dip condition while being connected to a weak grid. In the presence of an input voltage dip, motor may not be able to produce sufficient torque and maintain its original speed. A new technique is proposed in this study to maintain the desired reference torque and speed during a sustained voltage dip. The proposed technique is realised by evaluating mathematically the motor‘s allowable voltage dip margin corresponding to an operating point pertaining to a particular torque and speed in the current locus diagram of the motor. With prior knowledge of the voltage dip margin for every operating point in the current locus diagram, it would be possible to retain the same reference torque and speed by moving to a new operating point, which can be with lesser or greater as compared to the initial operating point, in case a voltage dip greater than the tolerable margin occurs. To start with, voltage dip margin has been derived theoretically and the operation of the motor is investigated by deliberately introducing a voltage dip. The proposed methodology has been verified through simulations and experiments in this study.
Inspec keywords: machine control; reluctance motor drives; power grids; torque; torque control
Other keywords: desired reference torque; reference torque; current locus diagram; particular torque; synchronous reluctance motor drive; initial operating point; sustained voltage dip condition; original speed; weak grid; voltage dip margin; input voltage dip; sufficient torque
Subjects: Synchronous machines; Control of electric power systems; Mechanical variables control; Drives
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