Peak-Ratio Analysis Method for Enhancement of LOM Protection Using M-Class PMUs

A novel technique for loss of mains (LOM) detection using phasor measurement unit (PMU) data is described in this paper. The technique, known as the peak ratio analysis method (PRAM), improves both sensitivity and stability of LOM protection when compared with prevailing techniques. The technique is...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2016-01, Vol.7 (1), p.291-299
Main Authors: Feng Ding, Booth, Campbell D., Roscoe, Andrew J.
Format: Article
Language:English
Subjects:
Control and protection
distribution networks
Disturbances
Frequency measurement
High voltages
Inertia
LOM
loss of mains (LOM)
monitoring
Penetration
Phase change random access memory
phasor measurement unit (PMU)
Phasor measurement units
Phasors
Power system stability
protection
Sensitivity
Switches
Transient analysis
Waveforms
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Summary:A novel technique for loss of mains (LOM) detection using phasor measurement unit (PMU) data is described in this paper. The technique, known as the peak ratio analysis method (PRAM), improves both sensitivity and stability of LOM protection when compared with prevailing techniques. The technique is based on a rate of change of frequency (ROCOF) measurement from M-class PMUs, but the key novelty of the method lies in the fact that it employs a new "peak-ratio" analysis of the measured ROCOF waveform during any frequency disturbance to determine whether the potentially-islanded element of the network is grid connected or not. The proposed technique is described and several examples of its operation are compared with three competing LOM protection methods that have all been widely used by industry and/or reported in the literature: standard ROCOF phase offset relay and phase angle difference methods. It is shown that the PRAM technique exhibits comparable performance to the others, and in many cases improves upon their abilities, in particular for systems where the inertia of the main power system is reduced, which may arise in future systems with increased penetrations of renewable generation and high voltage dc (HVDC) infeeds.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2015.2439512