| 引用本文: | 陈新岗,曾慧敏,马志鹏,等.基于改进K聚类多判据融合的柔性直流配电网单极故障选线[J].电力系统保护与控制,2025,53(9):49-59.[点击复制] |
| CHEN Xingang,ZENG Huimin,MA Zhipeng,et al.Single-pole fault line selection in flexible DC distribution networks based on improved K-means multi-criterion fusion[J].Power System Protection and Control,2025,53(9):49-59[点击复制] |
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| 摘要: |
| 小电流接地方式下的柔性直流配电网发生单极接地故障时，故障特征量小，故障识别难度大。为提高柔性直流配电网接地故障检测能力，提出一种基于K-means++多判据融合的柔性直流配电网单极故障选线方案。首先，对线路故障电气量进行模量分解，得到正常线路和故障线路零模电流、零模电压和零模功率的特征。然后，根据各线路零模电流Spearman相关性、零模电流与零模电压夹角余弦值以及零模功率积分绝对值大小的差异，构造3种故障选线判据。最后，通过K-means++算法对各线路3种选线结果进行分析，可准确选出故障线路。在PSCAD进行仿真验证，结果表明该方法耐过渡电阻、噪声干扰以及通信延时能力强，有效提高了单极接地故障选线的准确性和可靠性。 |
| 关键词: 柔性直流配电网 单极接地故障 K-means++ 故障选线 |
| DOI：10.19783/j.cnki.pspc.240551 |
| 投稿时间：2024-05-07修订日期：2024-10-09 |
| 基金项目:重庆市自然科学基金项目资助(CSTB2023NSCQ- MSX0337)；重庆市教育委员会科学技术研究项目资助(KJZD-K202101103)；重庆理工大学研究生教育高质量发展项目资助(gzlcx20233148) |
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| Single-pole fault line selection in flexible DC distribution networks based on improved K-means multi-criterion fusion |
| CHEN Xingang1,2,ZENG Huimin1,MA Zhipeng1,ZHANG Zhixian1,LI Song3,ZHANG Wenxuan1 |
| (1. School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China;
2. Chongqing Engineering Research Center of Energy Internet, Chongqing 400054, China; 3. School of
Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China) |
| Abstract: |
| In flexible DC distribution networks with low-current grounding mode, single-pole-to-ground faults exhibit weak fault characteristics, making fault identification challenging. To enhance fault detection capability, this paper proposes a single-pole fault line selection scheme for flexible DC distribution networks based on K-means++ multi-criterion fusion. First, modulus decomposition of electrical quantities during line faults is carried out, and the characteristics of zero-mode current, zero-mode voltage and zero-mode power for both normal and faulty lines are obtained. Then, according to the differences in the Spearman correlation of zero-mode current, the cosine of the angle between zero-mode current and voltage, and the absolute value of the zero-mode power integral, three fault line selection criteria are constructed. Finally, the K-means++ algorithm is used to analyze the results of the three criteria for each line, enabling accurate identification of the fault line. Simulations in PSCAD show that the proposed method has strong resistance to transition resistance, noise interference, and communication delay, significantly improving the accuracy and reliability of single-pole-to-ground fault line selection. |
| Key words: flexible DC distribution network single-pole-to-ground fault K-means++ fault line selection |
