Traveling Wave-Based Protection Scheme for Inverter-Dominated Microgrid Using Mathematical Morphology

Inverter-dominated microgrids impose significant challenges on the distribution network, as inverters are well known for their limited contribution to fault current, undermining the performance of traditional overcurrent protection schemes. This paper introduces a new protection scheme based on the...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2014-09, Vol.5 (5), p.2211-2218
Main Authors: Xinyao Li, Dysko, Adam, Burt, Graeme M.
Format: Article
Language:English
Subjects:
Circuit faults
Discrete wavelet transforms
Feature extraction
Initial current traveling wave
inverter-dominated microgrid
mathematical morphology
microgrid protection
Microgrids
Morphology
Noise reduction
Sensitivity
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Summary:Inverter-dominated microgrids impose significant challenges on the distribution network, as inverters are well known for their limited contribution to fault current, undermining the performance of traditional overcurrent protection schemes. This paper introduces a new protection scheme based on the initial current traveling wave utilizing an improved mathematical morphology (MM) technology, with simplified polarity detection and new logics introduced for meshed networks and feeders with single-end measurement. The proposed protection scheme provides ultrafast response and can be adapted to varied system operational modes, topologies, fault conditions, and load conditions. Only low-bandwidth communication is required to achieve high-speed operation and adequate discrimination level in meshed networks. Simulation in PSCAD/EMTDC verifies both the sensitivity and stability of the proposed protection scheme under different microgrid operational scenarios.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2014.2320365