胡云鹏,唐俊,张建锋,张宜永,张靖,王俊生
HU Yunpeng,TANG Jun,ZHANG Jianfeng,ZHANG Yiyong,ZHANG Jing,WANG Junsheng

• 1:南京南瑞继保电气有限公司

摘要(Abstract)：

分址建设特高压直流系统可省去汇流到换流站的交流输电线路，直接在异地进行直流汇流输电，但这一拓扑结构的变化对直流保护提出了新的要求。针对停运低端站的双极中性母线区域及接地极引线区域故障后，运行站无保护动作的问题，通过理论分析和仿真试验，提出了改进的保护判据；分析了高端站直流滤波器低压侧接地故障后现有故障隔离措施的缺陷，提出了高端站直流滤波器的故障隔离方案；最后对直流场差动保护的特点进行了分析，提出了优化的保护判据，并通过RTDS（实时数字仿真系统）进行了验证。
Spatially distributed UHVDC transmission systems eliminate the need for AC transmission lines converging at a converter station by enabling DC power transmission at remote locations. However, this change in topology introduces new challenges for DC protection. To address protection failure in the operating station after faults occur in the bipolar neutral bus area and grounding electrode line area of low-end nonoperational station, improved protection criteria are proposed based on theoretical analysis and simulation tests. Additionally, the shortcomings of existing fault isolation measures for grounding faults on the low-voltage side of the DC filter at the high-end terminal are analyzed, and a fault isolation scheme for the DC filter is proposed. Finally, the characteristics of differential protection in the DC field are examined, and optimal protection criteria are introduced and validated using real-time digital simulation(RTDS) system.

关键词(KeyWords)： 特高压直流;直流保护;分址建设;接地极引线接地故障;直流滤波器接地故障;差动保护
UHVDC;DC protection;spatially distributed;fault of grounding electrode lines;grounding fault of DC filter;differential protection

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司科技项目（5500-202426160A-1-1-ZN）

作者(Author): 胡云鹏,唐俊,张建锋,张宜永,张靖,王俊生
HU Yunpeng,TANG Jun,ZHANG Jianfeng,ZHANG Yiyong,ZHANG Jing,WANG Junsheng

DOI: 10.19585/j.zjdl.202504001

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