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<p>In the event of a fault occurring in a flexible DC system, the protection mechanism should be capable of isolating the fault line within a few milliseconds in order to prevent adverse effects on the entire system. The realization of a rapid and dependable identification of a faulty line represents a significant challenge in the domain of multi-terminal HVDC transmission line protection. This paper puts forth a transmission line protection method based on modulus increment as a means of addressing the adverse impact of positive and negative line coupling on fault detection accuracy in flexible DC transmission. Firstly, this paper presents an analysis of the characteristics of a line fault that has occurred subsequent to the utilization of the phase-mode decoupling method. Secondly, the correlation between the line-mode current increment and the direction of zero module voltage increment at the protection installation at both ends of the line is employed to construct the protection integration criterion, which considers both rapidity and reliability while still accurately identifying faults under 500 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Omega \)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Ω</mi> </math></EquationSource> </InlineEquation> transition resistance. Finally, the feasibility and superiority of the protection scheme are verified through simulation.</p>

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Multi-terminal flexible DC line protection method based on modulus increment

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Renwu Yan,
  • Guohe Zhang,
  • Ning Yu

摘要

In the event of a fault occurring in a flexible DC system, the protection mechanism should be capable of isolating the fault line within a few milliseconds in order to prevent adverse effects on the entire system. The realization of a rapid and dependable identification of a faulty line represents a significant challenge in the domain of multi-terminal HVDC transmission line protection. This paper puts forth a transmission line protection method based on modulus increment as a means of addressing the adverse impact of positive and negative line coupling on fault detection accuracy in flexible DC transmission. Firstly, this paper presents an analysis of the characteristics of a line fault that has occurred subsequent to the utilization of the phase-mode decoupling method. Secondly, the correlation between the line-mode current increment and the direction of zero module voltage increment at the protection installation at both ends of the line is employed to construct the protection integration criterion, which considers both rapidity and reliability while still accurately identifying faults under 500 \(\Omega \) Ω transition resistance. Finally, the feasibility and superiority of the protection scheme are verified through simulation.