Adaptive Mho Distance Protection for Interconnected Transmission Lines Compensated with Thyristor Controlled Series Capacitor

Ghada M. Abo-Hamad, Doaa Khalil Ibrahim, Essam Aboul Zahab and Ahmed F. Zobaa
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Ghada M. Abo-Hamad: Department of Electrical Power Engineering, Faculty of Engineering, Cairo University, Giza 12613, Egypt
Doaa Khalil Ibrahim: Department of Electrical Power Engineering, Faculty of Engineering, Cairo University, Giza 12613, Egypt
Essam Aboul Zahab: Department of Electrical Power Engineering, Faculty of Engineering, Cairo University, Giza 12613, Egypt
Ahmed F. Zobaa: College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge UB8 3PN, UK

Energies, 2021, vol. 14, issue 9, 1-29

Abstract: This paper proposes an adaptive dynamic Mho distance relay based on a phase comparator scheme for protecting interconnected transmission networks compensated with a Thyristor Controlled Series Capacitor (TCSC). The proposed relay uses an impedance index factor to initiate the fault detection subroutine. The RMS of the positive sequence current of the faulted loop and the TCSC terminal current are compared for TCSC zone identification. A phase comparator for ground and phase distance elements is proposed, relying on the positive sequence voltage as a polarized memory quantity, while the operating and polarizing quantities are developed using estimated TCSC impedance to mitigate its negative impact. The proposed scheme is easy in implementation and independent on synchronized data transfer, as minimum communication requirements are needed. To evaluate the performance of the proposed scheme, extensive simulation studies were carried out on an IEEE9 bus system compensated with TCSC for different firing angles covering four modes of TCSC operations, different fault types, and fault locations. In addition, an IEEE-39 bus network, as a large interconnected system, is tested for validation purposes. The achieved results designate the precision of the proposed scheme. Moreover, the results indicate its effectiveness for fault resistance tolerance, close-in three phase faults, and stable power swing phenomenon compared with conventional relays.

Keywords: close-in faults; dynamic distance relays; fault resistance; interconnected transmission lines; Mho distance relay; Thyristor Controlled Series Capacitor (TCSC) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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