| 引用本文: | 贾 科,刘可歆,毕天姝,等.基于波形匹配的柔性直流输电线路单端量保护研究[J].电力系统保护与控制,2025,53(03):13-26.[点击复制] |
| JIA Ke,LIU Kexin,BI Tianshu,et al.Research on single-ended protection of a flexible HVDC transmission line based on waveform matching[J].Power System Protection and Control,2025,53(03):13-26[点击复制] |
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| 摘要: |
| 柔性直流输电技术是解决大规模新能源接入问题的有力抓手，其线路保护是保障系统安全稳定的关键。线路单端量保护不需要借助通信，能较好地满足柔性直流输电系统对时间的要求。然而现有柔性直流输电系统单端量保护性能受后续行波影响较大，存在一定范围保护死区。对此，在充分考虑后续行波对首行波影响的基础上，深度挖掘区内外故障行波差异，进而提出基于波形匹配的故障识别判据。该判据可通过匹配误差与匹配波形特征相结合衡量后续行波影响程度，最终实现全线速动保护。基于PSCAD/EMTDC搭建了四端柔性直流输电系统。仿真结果验证了所提方法的可行性，且具有保护范围长、耐受过渡电阻能力强、抗噪声干扰能力强的优势。 |
| 关键词: 柔性直流输电 后续行波 波形匹配 波形特征 单端量保护 |
| DOI：10.19783/j.cnki.pspc.240258 |
| 投稿时间：2024-03-06修订日期：2024-07-24 |
| 基金项目:国家电网有限公司科技项目“新能源电力系统协同控制保护系统及应用”资助(5100-202199530A-0-5-ZN，5211DS21N013) |
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| Research on single-ended protection of a flexible HVDC transmission line based on waveform matching |
| JIA Ke,LIU Kexin,BI Tianshu,YAO Kunpeng,CHEN Shuai,LI Zainan |
| (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
(North China Electric Power University), Beijing 102206, China) |
| Abstract: |
| Flexible HVDC technology is powerful in addressing the integration of large-scale renewable energy, and its line protection is key to ensuring system safety and stability. Single-ended protection of the line does not require communication and can better meet the time requirements of flexible HVDC transmission systems. However, the performance of existing single-ended protection in flexible HVDC transmission systems is significantly affected by subsequent traveling waves, resulting in a certain range of protection dead zones. To address this, based on fully considering the impact of subsequent traveling waves on the initial traveling wave, the differences between internal and external fault traveling waves are explored, and a fault identification criterion based on waveform matching is proposed. This criterion can measure the impact of subsequent traveling waves by combining matching errors with matching waveform characteristics, ultimately achieving full-line rapid protection. A four-terminal flexible DC transmission system is built based on PSCAD/EMTDC. Simulation results verify the feasibility of the proposed method, which has the advantages of a long protection range, strong tolerance to transition resistance, and strong anti-noise interference capability. |
| Key words: flexible HVDC transmission subsequent traveling wave waveform matching waveform characteristic single-ended protection |
