NDLI: Testing of three-phase equipment under voltage sags

Content Provider	IET Digital Library
Author	Rolán, Alejandro Córcoles, Felipe Pedra, Joaquin Monjo, Lluis Bogarra, Santiago
Abstract	This paper provides insight into the testing of three-phase equipment exposed to voltage sags caused by faults. The voltage sag recovers at the fault-current zeros, leading to a ‘discrete’ voltage recovery, that is, the fault is cleared in different steps. In the literature, the most widespread classification divides ‘discrete’ sags into 14 types. The authors study shows that it is generally sufficient to consider only five sag types for three-phase equipment, here called ‘time-invariant (TI)’ equipment. As the remaining nine sag types cause identical equipment behaviour in Park or Ku variables, the number of laboratory tests (or of extensive simulations) on equipment under sags is reduced by a ratio of 14/5. The study is validated by simulation of a three-phase induction generator and a three-phase inverter, which are ‘TI’, and a three-phase diode bridge rectifier, which is not ‘TI’. Both analytical study and simulation results are validated by testing a three-phase induction motor and a three-phase diode bridge rectifier.
Starting Page	287
Ending Page	296
Page Count	10
ISSN	17518660
Volume Number	9
e-ISSN	17518679
Issue Number	Issue 4, Apr (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/9/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2014.0258
Journal	IET Electric Power Applications
Publisher Date	2015-04-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous Generator Asynchronous Machine Discrete Voltage Recovery Fault-current Zeros Harmonics Induction Motors Invertors Power Supply Quality Rectifying Circuit Three-phase Diode Bridge Rectifier Three-phase Equipment Testing Three-phase Induction Generator Three-phase Induction Motor Three-phase Inverter TI Equipment Time-invariant Equipment Voltage Sag
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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