基于负序电流dq轴分量的有源配电网纵联保护方法  

Pilot Protection of Active Distribution Network based on dq-axis Components of Negative Sequence Current

作　　者：张钥朗 李渠佳 钟润峰 邱可玥 代奇迹 王宇 龙伟强 ZHANG Yuelang;LI Qujia;ZHONG Runfeng;QIU Keyue;DAI Qiji;WANG Yu;LONG Weiqiang(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China;State Grid Chongqing Electric Power Company Construction Branch,Chongqing 401120,China;Xingyi Power Supply Bureau of Guizhou Power Grid Co.,Ltd.,Qianxinan 562400,Guizhou,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550005 [2]国网重庆市电力公司建设分公司,重庆401120 [3]贵州电网有限责任公司兴义供电局,贵州兴义562400

出　　处：《电力大数据》2024年第8期21-31,共11页Power Systems and Big Data

基　　金：南方电网限责任公司科技项目(GZKJXM20222153)。

摘　　要：随着分布式新能源在配电网中的渗透率不断提高,传统的三段式电流保护已难以满足保护需求。纵联保护作为一种有效的解决方案,虽然能应对高渗透率的新能源配电网保护需求,但其对通信条件的要求较高,且保护灵敏度易受不可测分支线路的影响。本文针对这一问题,考虑了不可测分支线路的影响,并在分析配电网线路两端负序电流相位关系的基础上,发现了区内外故障下线路两侧负序电流dq轴分量的比值差异。基于此,提出了一种基于负序电流dq轴分量的纵联保护方法。该方法能够适应配电网复杂多变的运行状况,对通信条件要求不高,在有源配电网中具有较好的应用前景。为了验证所提方法的有效性,利用PSCAD/EMTDC软件建立了有源配电网模型进行仿真实验。实验结果表明,所提方法能够有效识别配网线路区内外的不对称故障,为有源配电网的保护提供了新的思路和方法。The penetration rate of distributed new energy in the distribution network is increasing,the traditional three-section current protection is difficult to meet the protection needs.Pilot protection is a crucial strategy to meet the protection requirements of distribution networks with high new energy penetration,but it requires strong communication conditions and its protection sensitivity is sensitive to the effect of unmeasurable branch lines within the distribution network.This study considers the influence of undetectable branch lines,based on the analysis of the phase relationship between negative sequence currents on both sides of distribution network lines,obtains the ratio difference between the dq-axis components of negative sequence currents on both sides of the lines under internal faults and external faults,and then proposes a pilot protection method based on the dq-axis components of negative sequence currents.The method can adapt to the complex and changing operating conditions in distribution networks,and doesn't require high communication conditions,has good application prospects in active distribution networks.By building an active distribution network model using PSCAD/EMTDC software,the proposed method was validated.The results showed that it can effectively identify asymmetric internal faults and external faults of the distribution network line.

关 键 词：有源配电网 负序电流相角差 dq轴分量 派克变换 纵联保护 

分 类 号：TM73[电气工程—电力系统及自动化]