DocumentCode :
1556733
Title :
Limited ride-through capabilities for direct frequency converters
Author :
Klumpner, Christian ; Boldea, Ion ; Blaabjerg, Frede
Author_Institution :
Inst. of Energy Technol., Aalborg Univ., Denmark
Volume :
16
Issue :
6
fYear :
2001
fDate :
11/1/2001 12:00:00 AM
Firstpage :
837
Lastpage :
845
Abstract :
Many solutions to provide continuous operation of adjustable speed drives (ASDs) during power grid disturbances have been proposed, but they are all applied to DC-link ASD. In this paper a new solution to provide limited ride-through operation of a scalar controlled direct frequency converter (DFC) for a duration of hundreds of milliseconds, without any hardware modification, is presented. During the ride-through operation, the drive is not capable of developing torque or to control the motor flux. By recovering the necessary power to feed the control hardware, the DFC is able to keep the ASD operating. When normal grid conditions are re-established, the DFC is also able to accelerate the motor from nonzero speed and flux by initializing the modulator with the estimated frequency and initial voltage vector angle. The duration of the ride-through operation depends on the initial motor flux, speed level, rotor time constant, load torque and inertia
Keywords :
AC-AC power convertors; frequency convertors; induction motor drives; machine control; magnetic flux; magnetic variables control; rotors; torque control; variable speed drives; AC-AC conversion; ASD; adjustable speed drives; direct frequency converter; direct frequency converters; estimated frequency; flying start; induction motor drive; inertia; initial voltage vector angle; limited ride-through capabilities; load torque; modulator initialisation; motor flux control; motor torque control; power interruptions; rotor time constant; scalar controlled direct frequency converter; voltage source converter; Acceleration; Digital-to-frequency converters; Feeds; Frequency conversion; Frequency estimation; Hardware; Power grids; Power system stability; Torque control; Variable speed drives;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/63.974382
Filename :
974382
Link To Document :
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