Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems

-Since voltage interruptions, sags and swells are Power Quality (PQ) disturbances with great economic impact, studies that seek alternatives to mitigate its effects have been conducted extensively. The PQ Brazilian standard names these disturbances as Short-Duration Voltage Variations (SDVVs), class...

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Bibliographic Details
Published in:Electric power components and systems 2020-05, Vol.48 (8), p.858-869
Main Authors: da Costa, Lucas Araujo, Gazzana, Daniel da Silva, Leborgne, Roberto Chouhy
Format: Article
Language:English
Subjects:
distribution system
Disturbances
Economic impact
Impact analysis
interruptions
load connection
Mathematical analysis
mitigation
neutral grounding
Phase transitions
power quality
short-duration voltage variation
transformer winding connection
Transformers
Voltage sags
voltage swells
Winding
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Summary:-Since voltage interruptions, sags and swells are Power Quality (PQ) disturbances with great economic impact, studies that seek alternatives to mitigate its effects have been conducted extensively. The PQ Brazilian standard names these disturbances as Short-Duration Voltage Variations (SDVVs), classified them in terms of magnitude, duration, and frequency of occurrence. These parameters are used to calculate the Impact Factor (IF) of SDVVs, a severity-characterization index of their incidence. In this context, this work assesses the influence of three-phase transformer winding connection and neutral grounding on the quantities of SDVVs and the IF observed by an industrial consumer in a distribution system. Fault simulations at ATP-EMTP perform the study, considering two different winding connections for the secondary transformer and applying a grounding resistance to the neutral of the main transformer of the distribution system. The SDVVs are verified in two different ways: phase-to-ground and phase-to-phase voltages. It is observed that there are differences in these quantities and for the value of the IF due to the winding connection of the secondary transformer, the value of the neutral grounding resistance of the main transformer and the ways of voltage verification.
ISSN:1532-5008
1532-5016
DOI:10.1080/15325008.2020.1821835