The reliability and security of power systems may be jeopardized by the increase in the amounts of renewable generation and the uncertainties produced by these devices. In particular, the protection schemes of traditional power systems have been challenged by the integration of distributed generation (DG) resources. Distance relays (DRs), which have been mainly employed to protect transmission systems, are increasingly proposed as one of the solutions to protect distribution systems with a heavy penetration of DGs. However, conventional distance protection faces several drawbacks that might lead to maloperation. One of those challenges is the "infeed effect", which causes the impedance seen by the distance relay to be larger than the actual positive-sequence line impedance between the fault and relay location. This paper proposes three new methods to estimate the distance to the fault in the presence of infeeds, whether in a radial distribution feeder or the transmission line. Unlike other solution methodologies in the literature that require communication links to estimate the distance to the fault, the proposed methods only need the local measurement (i.e., the voltage and current measurements at the location of the distance relay) to do the same. The performance of the method is demonstrated with a radial distribution system model in PSCAD™/EMTDC™.
F. Hariri and M. Crow, "New Infeed Correction Methods for Distance Protection in Distribution Systems," Energies, vol. 14, no. 15, article no. 4652, MDPI, Aug 2021.
The definitive version is available at https://doi.org/10.3390/en14154652
Electrical and Computer Engineering
Keywords and Phrases
Distance Relay; Distributed Generation; Faults; Infeed Effect; Protection; PSCAD
International Standard Serial Number (ISSN)
Article - Journal
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01 Aug 2021