A fault location method for DC transmission line based on the distributed parameter model considering line parameter uncertainty

• Published in: Electric power systems research Vol. 238; p. 111146
• Main Authors: Xia, Chengjun, Yang, Mingjia, Chi, Zibin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2025
• Subjects: DC Transmission Line; Distributed Parameter Model; Fault Location; Parameter Estimation; Parameter Estimation; DC Transmission Line; Distributed Parameter Model; Fault Location
• ISSN: 0378-7796
• DOI: 10.1016/j.epsr.2024.111146

•Based on the equivalent HVDC transmission line of the distributed parameter model considering the high-order infinitesimal quantity, a parameter estimation method based on the high order derivation is proposed.•Considering the uncertainty of line parameters, a method of line parameter correction is proposed to establish an accurate line equivalent model.•Fault characteristics of HVDC transmission line are analyzed from the perspective of power based on Tellegen's quasi-power theorem, and fault location is realized by comparing the quasi-power values of HVDC transmission line during normal operation and internal fault. Addressing the impact of whether line parameters can be accurately obtained and the errors due to environmental influences on the accuracy of fault location for DC transmission line, this paper proposes a fault location method based on the distributed parameter model that accounts for uncertainty in line parameter. To address the challenge of accurately obtaining DC transmission line parameters, a high-order derivative-based parameter estimation method is introduced to determine unknown equivalent parameters of the DC transmission line. Additionally, an optimization algorithm is incorporated to dynamically correct parameter errors, thereby enhancing parameter stability and constructing an accurate line model. Based on this, theoretical derivations confirm the applicability of the Tellegen's quasi-power theorem in the normal operation and internal fault equivalent models of DC transmission line. A fault location function is established based on the relationship between the line's Tellegen quasi-power characteristic and fault distance. The proposed method's effectiveness and accuracy are validated using a DC system model built on the PSCAD/EMTDC simulation platform. Simulation results indicate that the proposed method can locate faults under different fault conditions.