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Mahyar Abasi

Mahyar Abasi

Academic rank: Assistant Professor
ORCID: https://orcid.org/0000-0001-5228-6803
Education: PhD.
ScopusId: AAM-8891-2020
HIndex:
Faculty: Engineering
Address: Arak University
Phone: 08632625099

Research

Title
Improving Differential Relay Performance during Cross-Country Fault Using a Fuzzy Logic-based Control Algorithm
Type
Presentation
Keywords
power transmission line protection; differential relay; stability characteristics; fuzzy logic
Year
2019
Researchers Mahyar Abasi ، Ahmad Torabi Farsani ، Arash Rohani ، Mohsen Aghazadeh Shiran

Abstract

This paper presents a fuzzy logic-based algorithm to improve the performance of the differential relay in short transmission line protection for Cross-Country faults. This type of faults leads to the malfunction of current differential relays, while the probability of the relay performance error becomes negligible by using a fuzzy logic system along with the changes in per-unit values and the slope of the differential relay, and consequently choosing the best stability characteristics. In the proposed algorithm, the sensitivity, operation reliability, and performance speed for several types of faults including internal faults and even the high-resistive faults are maintained in the satisfactory levels. The algorithm is also suitable for external faults with the saturation of current transformers (CTs), and it improves the relay performance. The effectiveness of the algorithm is verified in EMTDC/PSCAD software program, and the obtained results are compared with those of conventional methods.