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A fast time–frequency transform based differential relaying scheme for UPFC based double-circuit transmission line |
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| Affiliation: | 1. School of Electrical Science, Indian Institute of Technology Bhubaneswar, India;2. Siksha ‘O’ Anusandhan University, Bhubaneswar, Odisha 751030, India;1. Dept. of Electrical & Electronic Engineering, Rajshahi University of Engineering & Technology, Rajshahi 6204, Bangladesh;2. Dept. of Electronics & Telecommunication Engineering, Rajshahi University of Engineering & Technology, Rajshahi 6204, Bangladesh;1. Key Laboratory for Quantum Optics and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;2. Lab of Quantum Information, University of Science and Technology of China, Hefei 230026, China;1. Department of Electrical and Electronics Engineering, Veer Surendra Sai University of Technology, Burla, Odisha 768018, India;2. School of Electrical Engineering, KIIT University, Bhubaneswar, Odisha 761008, India |
| Abstract: | This paper presents a new differential relaying scheme for a mutually coupled, double circuit transmission line in presence of Unified Power Flow Controller (UPFC) in the line. The process starts at retrieving the three phase current signals at both ends of the transmission line synchronously and processing it though the time–frequency transform such as Fast Discrete S-Transform to derive the spectral energy content of the current signals. The differential spectral energy of current signals (difference between the spectral energy of the current signal at the sending and receiving ends, respectively) of the respective phases of transmission line is used to register the fault pattern. The proposed approach includes fault detection and classification along with identification of the fault section with respect to UPFC location in one of the double-circuit transmission line. The extensive test results indicate that the proposed differential relaying scheme is highly reliable in registering fault patterns in UPFC based transmission line including wide variations in operating parameters of the power network. |
| Keywords: | Double-circuit transmission line Fast Discrete S-Transform (FDST) Time–frequency transform Spectral energy (SE) Unified Power Flow Controller (UPFC) |
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