Identification of the Critical Characteristics of Different Types of Voltage Sags for Synchronous Machine Torque Oscillations

Abstract-This article investigates the effects of symmetrical and unsymmetrical voltage sags on an important characteristic of torque pulsation of synchronous machines. Voltage sags may cause high torque pulsations, which can damage the shaft or equipment connected to it. Duration, magnitude,and ini...

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Bibliographic Details
Published in:Electric power components and systems 2014-10, Vol.42 (13), p.1347-1355
Main Authors: Alipoor, Jaber, Doroudi, Aref, Hosseinian, Seyed Hossein
Format: Article
Language:English
Subjects:
Electric currents
Electric potential
flux trajectory
Identification
power quality
Power supply
Pulsation
Sag
Synchronous machines
Synchronous motors
Torque
torque oscillations
Voltage
voltage dip
voltage sag
Voltage sags
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Summary:Abstract-This article investigates the effects of symmetrical and unsymmetrical voltage sags on an important characteristic of torque pulsation of synchronous machines. Voltage sags may cause high torque pulsations, which can damage the shaft or equipment connected to it. Duration, magnitude,and initial point-on-wave of the voltage sag are the major characteristics that can influence the synchronous motors torque transients. The effect of the characteristics on the severity of the transient torque is clarified parametrically, and the critical characteristics of each type of voltage sag are extracted. A theoretical analysis is first presented to determine the severest conditions. In this analysis, for each type of voltage sag, the stator flux trajectory in complex coordination is traced to monitor its variation during and after sag. By this method, the effects of different sag types can easily be compared during the sag and at the sag ending instant. To justify the theoretical analysis, simulations of a typical synchronous motor are carried out that confirm the theoretical analysis.
ISSN:1532-5008
1532-5016
DOI:10.1080/15325008.2014.933376