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A PMU-Based LOE Protection of Synchronous Generator in the Presence of GIPFC.

Authors :
Ghorbani, Amir
Soleymani, Soodabeh
Mozafari, Babak
Source :
IEEE Transactions on Power Delivery. Apr2016, Vol. 31 Issue 2, p551-558. 8p.
Publication Year :
2016

Abstract

The existence of a generalized interline power-flow controller (GIPFC) in the transmission lines changes the voltage and current signals which are measured with the protection relays of power system dynamically. In this paper, the effects of the GIPFC on the measured impedance by the loss of excitation (LOE) relay of the synchronous generator are first investigated by analytical and computational methods for different operating modes of the power system. The results indicate that the presence of GIPFC causes a substantial delay on the operation of the LOE relay. It is also shown that when partial LOE occurs, the GIPFC causes to the LOE relay under-reaching. Consequently, to readjust the relay in the presence of the GIPFC, a new modified LOE protection algorithm on the basis of synchronized phasor measurements received from phasor measurement units is presented. The most important advantage of this modified algorithm is that it is a general algorithm which considers all voltage-source-converter-based flexible ac transmission systems controllers. Regarding the simulations results, it is concluded that using the modified algorithm for the LOE relay can sufficiently decrease the delay and prevent the relay from under-reaching. The impacts of the unified power-flow controller and interline power-flow controller on the LOE relay are also demonstrated. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08858977
Volume :
31
Issue :
2
Database :
Academic Search Index
Journal :
IEEE Transactions on Power Delivery
Publication Type :
Academic Journal
Accession number :
114035485
Full Text :
https://doi.org/10.1109/TPWRD.2015.2440314