王书征,杨军炜,王晓琪,韩彬彬,张金华
WANG Shuzheng,YANG Junwei,WANG Xiaoqi,HAN Binbin,ZHANG Jinhua

• 1:南京工程学院电力工程学院

摘要(Abstract)：

由于混合级联直流输电系统结构复杂，为提高直流线路保护的适应性，提出一种基于边界暂态功率方向的直流线路保护方案。首先，以平波电抗器为边界，当线路发生故障时，根据两侧电压、电流得到边界暂态功率方向。然后，通过分析边界暂态功率方向的特征进行区内外故障识别，并将正、负边界暂态功率之和相比，判断故障极。最后，采用仿真软件搭建白鹤滩—江苏特高压混合级联直流输电系统，对保护方案进行验证，仿真结果表明：该保护方案能够在6 ms内准确识别区内外故障，并且能够耐受600Ω的过渡电阻。
Due to the complex structure of hybrid cascaded DC transmission systems, a DC line protection scheme based on boundary transient power direction is proposed to enhance protection adaptability. First, the smoothing reactor serves as the boundary, enabling the derivation of transient power direction from voltages and currents on both sides of the reactor during line faults. Then, internal and external faults are identified by analyzing the characteristics of the boundary transient power direction, and the faulted pole is determined by comparing the summation of positive and negative boundary transient power values. Finally, the Baihetan-Jiangsu UHV hybrid cascaded DC transmission system is modeled using simulation software to verify the protection scheme. Results show that the proposed protection scheme can accurately identify internal and external faults within 6 ms and withstand transition resistances up to 600 Ω.

关键词(KeyWords)： 混合级联直流输电系统;线路保护;暂态功率方向;平波电抗器;故障识别;选极判据
hybrid cascaded HVDC transmission system;line protection;transient power direction;smoothing reactor;fault identification;pole selection criterion

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（52107098）

作者(Author): 王书征,杨军炜,王晓琪,韩彬彬,张金华
WANG Shuzheng,YANG Junwei,WANG Xiaoqi,HAN Binbin,ZHANG Jinhua

DOI: 10.19585/j.zjdl.202504003

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