An AC Line Longitudinal Protection Method for Flexible DC System Integration Based on Inductance Parameters

YANG Xiaofeng; ZHAO Shousheng; QIU Yutao; LI Kangyi; WANG Wujing; MA Jing

doi:10.19725/j.cnki.1007-2322.2023.0329

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An AC Line Longitudinal Protection Method for Flexible DC System Integration Based on Inductance Parameters

更新时间：2025-12-11

- An AC Line Longitudinal Protection Method for Flexible DC System Integration Based on Inductance Parameters
- Issue 6, Pages: 1143-1152(2025)
- 作者机构：
  
  1. 国网浙江省电力有限公司绍兴供电公司,浙江省,绍兴市,312000
  2. 国网浙江省电力有限公司,浙江省,杭州市,310000
  3. 新能源电力系统国家重点实验室(华北电力大学), 北京市昌平区,102206
- 作者简介：
- 基金信息：
- DOI：10.19725/j.cnki.1007-2322.2023.0329
  CLC：
- Published：2025
- 稿件说明：
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YANG Xiaofeng, ZHAO Shousheng, QIU Yutao, et al. An AC Line Longitudinal Protection Method for Flexible DC System Integration Based on Inductance Parameters[J]. 2025, (6): 1143-1152.
DOI：

YANG Xiaofeng, ZHAO Shousheng, QIU Yutao, et al. An AC Line Longitudinal Protection Method for Flexible DC System Integration Based on Inductance Parameters[J]. 2025, (6): 1143-1152. DOI： 10.19725/j.cnki.1007-2322.2023.0329.

摘要

对于与柔性直流系统集成的交流线路，传统的工频保护方案运行性能较差，甚至可能误动作或无法运行。针对这一问题，提出了一种基于瞬时电感参数的新型交流线路保护方案。首先，分析柔性直流换流站各子模块的开关问题，并构建直流换流站交流线路故障模型。基于该模型，计算了不同故障位置下交流线路两端的瞬时电感。在正向故障情况下，瞬时电感的计算值与理论值基本一致。当发生外部反向故障时，瞬时电感的计算值与理论值有很大偏差。因此，通过两条线路两端逻辑信息的交互作用，构建了一个区分内部故障和外部故障的保护判据。最后，在RT-LAB中模拟了硬件在环测试。结果证明，所提出的方法能准确识别内部故障和外部故障。该方法运行速度快，不受故障电阻和故障类型的影响。

Abstract

Traditional IF protection schemes is inadequate for AC lines integrated with flexible DC systems and may even result in incorrect operation or failure to operate. To address this issue

a new AC line protection scheme is proposed based on instantaneous inductance parameters. The switching issues of each submodule in the flexible DC converter station are initially analyzed

followed by the construction of the AC line fault model of the DC converter station The instantaneous inductance of AC line ends under different fault locations is calculated based on this model. The calculated value of instantaneous inductance in the case of forward fault is basically consistent with the theoretical value. When an external reverse fault occurs

the calculated value of the instantaneous inductance deviates significantly from the theoretical value. Therefore

a protection criterion is formulated to distinguish internal faults and external faults through the interaction of the logic information at both ends of the two lines. Finally

a hardware-in-the-loop test is simulated in RT-LAB. The results demonstrate that the proposed method’s capability in accurately recognizing internal and external faults. The method runs efficiently and is independent of fault resistance and fault type.

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references

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