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An Inrush Current Elimination Technique for a Voltage Sag Compensator While Powering TransformerCoupled Loads

Title
An Inrush Current Elimination Technique for a Voltage Sag Compensator While Powering TransformerCoupled Loads
Author
권병일
Keywords
Voltage fluctuations; Inverters; Surges; Circuit faults; Surge protection; Delays; Voltage control
Issue Date
2015-09
Publisher
IEEE
Citation
2015 IEEE Energy Conversion Congress and Exposition (ECCE), Page. 2710-2714
Abstract
Sags are the foremost power quality problem encountered by industrial consumers since they frequently causes the interruption of manufacturing processes that can result in significant economic loss. To resolve such problems, a voltage sag compensator is often installed by industrial consumers within critical industrial applications. However, the operation of the compensator takes a few milliseconds when a sag occurs. Hence the transformer, which is usually mounted in front of the critical load, is likely to be exposed to the sag voltages during this time interval. As a result, when the compensator reinstates the load voltage, a serious magnitude of transient current starts flowing towards the sensitive load. This inrush current can either damage the equipment or activate the protective devices of the compensator. In either case, compensation will eventually fail. To eliminate the inrush current phenomenon and to obtain seamless compensation for sensitive loads, this paper proposes a sag compensator based upon a customary current regulated voltage source inverter (CRVSI). This compensator employs a current control scheme implemented in a stationary frame of reference to regulate the current for the load by connecting it to the secondary of the load transformer. The operation of the proposed system is validated through laboratory test results obtained during different possible sag types.
URI
http://ieeexplore.ieee.org/document/7310040/http://repository.hanyang.ac.kr/handle/20.500.11754/101503
ISBN
978-1-4673-7151-3
ISSN
2329-3721; 2329-3748
DOI
10.1109/ECCE.2015.7310040
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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