| 引用本文: | 翁汉琍,刘胜福,林湘宁,吴宇奇.基于二次反行波的新能源送出线路单端暂态量主保护新方案[J].电力自动化设备,2025,45(7):172-182 |
| WENG Hanli,LIU Shengfu,LIN Xiangning,WU Yuqi.New scheme of single-ended transient quantity main protection for new energy transmission line based on secondary inverse traveling wave[J].Electric Power Automation Equipment,2025,45(7):172-182 |
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| 摘要: |
| 传统的单端工频量主保护在新能源送出线路中难以适用，单一边界保护判据无法可靠保护线路全长，行波距离保护在正向区外故障下存在误动风险。为此，提出了一种基于二次反行波的新能源送出线路单端暂态量主保护新方案，通过不同保护判据间的优势互补，恢复并强化新能源交流送出线路单端主保护的动作性能。分析了故障行波的折反射特性及区内、外故障反行波波过程。根据发生区内、外故障时首个同极性波与首个反极性波到达检测点的时刻之和的差异，提出了新的单端测距式行波保护判据，针对所提判据存在的故障判别死区及三相金属性短路故障失效的问题，通过引入边界保护判据及设计新的辅助判据进行互补，形成一种单端暂态量主保护新方案。在PSCAD平台搭建仿真模型，对所提保护判据及方案的有效性、灵敏性与可靠性进行了验证。 |
| 关键词: 新能源线路 边界保护 行波距离保护 行波极性 单端暂态量保护 继电保护 |
| DOI：10.16081/j.epae.202501008 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金企业创新发展联合基金资助项目(U22B20106) |
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| New scheme of single-ended transient quantity main protection for new energy transmission line based on secondary inverse traveling wave |
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WENG Hanli1,2, LIU Shengfu1, LIN Xiangning2,3, WU Yuqi3
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1.College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China;2.Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University, Yichang 443002, China;3.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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| Abstract: |
| The traditional single-ended power frequency main protection is difficult to apply in new energy transmission lines, and a single boundary protection criterion cannot reliably protect the entire length of the line. The traveling wave distance protection has the risk of misoperation in the event of faults outside the forward zone. Therefore, a new scheme for single-ended transient quantity main protection of new energy transmission lines based on secondary inverse traveling waves is proposed. By complementing the advantages of different protection criteria, the operational performance of single-ended main protection of new energy AC transmission lines is restored and strengthened. The reflection characteristics of fault traveling waves and the process of fault reflected waves inside and outside the zone are analyzed. Based on the difference of the sum of the times when the first wave of the same polarity and the first wave of the opposite polarity arrive at the detection point during faults inside and outside the zone, a new single-ended ranging traveling wave protection criterion is proposed. In response to the problems of fault discrimination dead zone and three-phase metallic short circuit fault failure in the proposed criterion, a new scheme for single-ended transient quantity main protection is formed by introducing boundary protection criteria and designing new auxiliary criteria to complement each other. A simulation model is built on the PSCAD platform to verify the effectiveness, sensitivity and reliability of the proposed protection criteria and scheme. |
| Key words: new energy line boundary protection traveling wave distance protection traveling wave polarity single-ended transient quantity main protection relay protection |
