引用本文:李振兴,朱益,王扬赜,陈艳霞,皮志勇,翁汉琍.小级差需求下基于故障首半波比较的快速电流保护[J].电力自动化设备,2024,44(6):153-160,201.
LI Zhenxing,ZHU Yi,WANG Yangze,CHEN Yanxia,PI Zhiyong,WENG Hanli.Fast current protection based on fault first half-wave comparison under small stage difference demand[J].Electric Power Automation Equipment,2024,44(6):153-160,201.
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小级差需求下基于故障首半波比较的快速电流保护
李振兴1, 朱益1, 王扬赜1, 陈艳霞2, 皮志勇3, 翁汉琍1
1.三峡大学 新能源微电网湖北省协同创新中心,湖北 宜昌 443002;2.国家电网北京市电力公司 电力科学研究院,北京 100075;3.国网湖北省电力有限公司荆门供电公司,湖北 荆门 448000
摘要:
基于时间级差配合的梯级电流保护受限于出口线路保护动作时间,为缩短保护研判时间,提升配电网多级配合能力,提出一种小级差需求下基于故障首半波比较的快速电流保护方法。对传统电流保护动作时间进行分析,采用整定值构建模板曲线,与故障电流采样值进行多点动态比较,基于有效值爬坡效应及采样值越限效应构建新的保护启动判据、考虑保护算法延迟及干扰点的影响构建新的动作判据,综合加快电流保护判别速度。利用PSCAD/EMTDC软件仿真验证了所提方法在不同类型故障、不同故障时刻、负荷突增、干扰影响等工况下的有效性,结果表明所提方法的动作时间不超过10 ms,有利于小级差更加灵活和可靠的整定。
关键词:  多级配电网  小级差  快速电流保护  继电保护  模板曲线  电流采样值
DOI:10.16081/j.epae.202312043
分类号:
基金项目:国家自然科学基金资助项目(52077120)
Fast current protection based on fault first half-wave comparison under small stage difference demand
LI Zhenxing1, ZHU Yi1, WANG Yangze1, CHEN Yanxia2, PI Zhiyong3, WENG Hanli1
1.Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University, Yichang 443002, China;2.Electric Power Research Institute, State Grid Beijing Electric Power Company, Beijing 100075, China;3.State Grid Hubei Jingmen Electric Power Supply Company, Jingmen 448000, China
Abstract:
The step current protection based on the stage time difference coordination is limited by the output line protection action time. To shorten the protection judgment time and improve the multi-level cooperation ability of the distribution network, a fast current protection based on fault first half-wave comparison under small stage difference demand is proposed. The action time of traditional current protection is analyzed. The template curve is then constructed based on the setting value, and the multi-point dynamic comparison with the fault current sampling value is carried out. Based on the root mean square value ramping effect and the sampling value over-limit effect, a new protection startup criterion is constructed, and a new action criterion is constructed considering the protection algorithm delay and the influence of interference points, which comprehensively speeds up the current protection judgment speed. The PSCAD/EMTDC software simulation is used to verify the effectiveness of the proposed method under the working conditions of different fault types, fault times, sudden load increases and interferences. The results show that the action time of the proposed method does not exceed 10 ms, it is conducive to more flexible and reliable setting of small stage difference.
Key words:  multi-level distribution network  small stage difference  fast current protection  relay protection  template curve  current sampling value

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