Effective Overvoltage Source Identification Scheme for Machines Working in Parallel

A novel criterion for exactly identifying the machine leading to overvoltage of the common bus among the machines working in parallel is developed. Lose of selectivity of existing schemes in some cases is discussed. Correspondingly, an improved scheme is proposed. The change of nonload electromotive...

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Published in:IEEE transactions on energy conversion 2012-12, Vol.27 (4), p.938-947
Main Authors: Lin, Xiangning, Zhao, Feng, Gao, Yan, He, Yue, Weng, Hanli, Bo, Zhiqian
Format: Article
Language:English
Subjects:
Change of nonload electromotive force (EMF)
exciter runaway
Generators
Load modeling
machines in parallel
overvoltage protection
Reactive power
Voltage control
Voltage measurement
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cited_by cdi_FETCH-LOGICAL-c263t-8a06836738f2d7857d5977bb3ff518babe0dbb62a3abd7b332ac7961a4687a543
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creator Lin, Xiangning
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description A novel criterion for exactly identifying the machine leading to overvoltage of the common bus among the machines working in parallel is developed. Lose of selectivity of existing schemes in some cases is discussed. Correspondingly, an improved scheme is proposed. The change of nonload electromotive force (EMF) of generator is used to design a correction coefficient for the operation time characteristic of the overvoltage protection. The generator accompanied by the maximum positive change of nonload EMF will be judged as the one with runaway exciter. Theoretical analysis and EMTDC-based simulation tests prove that the source leading to overvoltage of the unit terminal can be correctly discriminated by means of this new criterion. A thorough comparison between the existent schemes and the proposed scheme has been made, which demonstrates that the new proposed scheme is superior to the existent ones.
doi_str_mv 10.1109/TEC.2012.2205930
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source IEEE Electronic Library (IEL) Journals
subjects Change of nonload electromotive force (EMF)
exciter runaway
Generators
Load modeling
machines in parallel
overvoltage protection
Reactive power
Voltage control
Voltage measurement
title Effective Overvoltage Source Identification Scheme for Machines Working in Parallel
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