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Keywords

fault location, fault positioning, transmission line, renewable energy, time-domain voltage

Abstract

Affected by the control strategy and parameters of renewable energy units, once a fault occurs in a renewable energy transmission line, the short-circuit current on the renewable energy side exhibits characteristics such as controlled amplitude, sudden phase change, and a high proportion of non-power-frequency components, which leads to the failure of traditional double-end and single-end fault location methods based on power-frequency components. To address this problem, higher-order fault transient differential equations of the renewable energy transmission line before and after the fault point were provided. A joint equation system for solving fault distance was constructed based on the time-domain sampled voltages and sampled currents at both ends of the line. The time-domain transient voltage fitting was realized by integrating the Newton-Raphson method and the least squares method. The solution of the higher-order nonlinear differential joint equation system was achieved by using the transient multi-sampling data within the time window, and the accurate fault location of the transmission line was ultimately accomplished. The results indicate that the proposed location method only requires the instantaneous sampling values of three-phase voltages and currents at both ends of the renewable energy transmission line, and is not affected by the converters of power electronic equipment. The location error is within 5%. The installation of expensive traveling-wave location devices can be avoided, and its engineering implementation is easy.

DOI

10.19781/j.issn.1673-9140.2026.03.006

First Page

59

Last Page

67

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