| 引用本文: | 戴志辉,陈思琦,李毅然,张艺宏,何静远,于礼瑞.基于聚类中心距离度量的柔性直流配电线路保护原理[J].电力自动化设备,2022,42(9): |
| DAI Zhihui,CHEN Siqi,LI Yiran,ZHANG Yihong,HE Jingyuan,YU Lirui.Protection principle of flexible DC distribution line based on clustering center distance measurement[J].Electric Power Automation Equipment,2022,42(9): |
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| 摘要: |
| 针对现有柔性直流配电网单端量保护选择性差、双端量保护速动性差、数据同步性要求高等问题，提出一种基于聚类中心距离度量的柔性直流配电线路保护原理。该原理仅用单侧电流作为特征量，通过模拟线路不同位置发生不同类型短路故障，并结合实际发生的故障，采集故障后线路上的电流数据经处理后组成历史数据样本；利用K-means聚类算法得到不同类型故障下的最佳聚类中心，再通过比较实时数据与各聚类中心的距离实现故障识别与选极。该原理无需复杂的特征量提取和计算过程，避免了常规电流保护复杂的定值整定。最后，在PSCAD/EMTDC中进行了仿真验证，结果表明，所提保护原理具有良好的选择性和速动性，且与常规基于本地信息的电流保护相比耐过渡电阻能力有所提升。 |
| 关键词: 柔性直流配电网 聚类算法 聚类中心 继电保护 单端量保护 故障识别 |
| DOI：10.16081/j.epae.202205065 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金资助项目(51877084) |
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| Protection principle of flexible DC distribution line based on clustering center distance measurement |
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DAI Zhihui, CHEN Siqi, LI Yiran, ZHANG Yihong, HE Jingyuan, YU Lirui
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Hebei Key Laboratory of Distributed Energy Storage and Microgrid, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| Aiming at the issues of poor selectivity of single-terminal protection, and poor speed and high requirements for data synchronization of double-terminal protection in existing flexible DC distribution network, the protection principle of flexible DC distribution line based on clustering center distance measurement is proposed. The principle only uses single-side current as the characteristic quantity. Different types of short circuit faults at different locations of the line are simulated, and combined with the actual faults, the post-fault line currents are collected and processed to form historical data samples. The K-means clustering algorithm is then used to find the best clustering centers under different types of faults, and fault identification and pole selection are realized by comparing the distance between real-time data and each clustering center. The proposed principle doesn’t need complex feature extraction and calculation process, and the complex setting of conventional current protection can be avoided. Finally, the simulation is carried out in PSCAD/EMTDC, and the results show that the proposed protection principle has good selectivity and rapidity, and the ability to resist the transition resistance is improved compared with the conventional current protection based on local information. |
| Key words: flexible DC distribution network clustering algorithms clustering center relay protection single-terminal protection fault identification |
