A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System

Shimin Xue, Junchi Lu, Chong Liu, Yabing Sun, Baibing Liu and Cheng Gu
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Shimin Xue: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Junchi Lu: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Chong Liu: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Yabing Sun: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Baibing Liu: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Cheng Gu: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China

Energies, 2018, vol. 11, issue 8, 1-16

Abstract: Accurate and reliable fault location method for alternating current (AC) transmission lines is essential to the fault recovery. MMC-based converter brings exclusive non-linear characteristics to AC networks under single-phase-to-ground faults, thus influencing the performance of the fault location method. Fault characteristics are related to the control strategies of the converter. However, the existing fault location methods do not take the control strategies into account, with further study being required to solve this problem. The influence of the control strategies to the fault compound sequence network is analyzed in this paper first. Then, a unique boundary condition that the fault voltage and negative-sequence fault current merely meet the direct proportion linear relationship at the fault point, is derived. Based on these, a unary linear regression analysis is performed, and the fault can be located according to the minimum residual sum function principle. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation platform. A large number of simulation results are used to verify the advantages on sampling frequency, fault resistance, and fault distance. More importantly, it provides a higher ranging precision and has extensive applicability.

Keywords: fault location; AC/DC hybrid system; MMC-HVDC; negative-sequence current restraint strategy; single-terminal electrical quantity (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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