考虑换相失败影响的交流线路单相故障性质判据  

Criterion of single-phase fault nature of AC line consideringthe influence of commutation failure

作　　者：李凤婷[1] 刘雨姗 解超 刘建勋 黄飞 LI Fengting;LIU Yushan;XIE Chao;LIU Jianxun;HUANG Fei(Engineering Research Center for Renewable Energy Power Generation and Grid Connection Control,Ministry of Education,Xinjiang University,Urumqi 830046,China;State Grid Xinjiang Electric Power Co.,Ltd.,Changji Power Supply Company,Changji 831100,China)

机构地区：[1]新疆大学可再生能源发电与并网控制教育部工程研究中心,新疆维吾尔自治区乌鲁木齐830046 [2]国网新疆电力有限公司昌吉供电公司,新疆维吾尔自治区昌吉831100

出　　处：《电力工程技术》2022年第6期82-90,共9页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51877185)。

摘　　要：逆变侧交流线路电流幅值受直流换相失败影响在单相跳闸后出现短时波动,该波动范围会随着直流换相失败次数增加而增大,造成基于恢复电压幅值的传统单相故障性质判据发生误判。针对这一问题,首先搭建输电线路故障相等值模型,评估直流换相失败对健全相电压的影响,推导出不同故障性质下恢复电压阶段断开相电压时域表达式;其次根据断开相时域电压波形的差异性进行积分计算,提出基于时域电压积分的单相故障性质识别判据;最后利用PSCAD/EMTDC仿真软件搭建模型对所提判据进行验证。结果表明,文中所提方法的耐过渡电阻能力良好,具有一定的抗直流干扰能力,所提判据在直流换相失败条件下依然能够可靠判别故障性质。The amplitude of AC line current at the inverter side is affected by DC commutation failure and fluctuates for a short time after single-phase trip.The fluctuation range increases with the increase of the number of DC commutation failures,resulting in the misjudgment of the traditional single-phase fault nature criterion based on the amplitude of the recovery voltage.To solve this problem,a transmission line fault equivalence model is built firstly to evaluate the impact of DC commutation failure on the sound phase voltage.Then the time domain expressions are derived for the disconnected phase voltage during the recovery voltage stage for different fault nature.After that,a single-phase fault nature identification criterion based on time domain voltage integration is proposed,and its effectiveness is verified by PSCAD/EMTDC simulation.The results show that the proposed method has good resistance to transition resistance and DC interference,and the fault nature identification criterion is suitable for DC commutation failure.

关 键 词：单相跳闸 换相失败 恢复电压幅值 健全相电压 时域电压 单相故障性质判据 

分 类 号：TM773[电气工程—电力系统及自动化]