特高压交直流互联系统的差动保护研究
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引用本文:王奇1,苏浩辉1,唐浩2,毛建维2.特高压交直流互联系统的差动保护研究[J].计算技术与自动化,2020,(2):62-66
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王奇1,苏浩辉1,唐浩2,毛建维2 (1. 中国南方电网超高压输电公司检修试验中心广东 广州 510700 2. 南京南瑞继保电气有限公司江苏 南京 211102) 
中文摘要:特高压交直流(UHVAC-DC)互联系统的迅速发展使得谐波变得更加不稳定。研究了有功电流差动保护方法在UHVAC-DC互联系统中的应用。分析了特高压直流(UHVDC)输电对传统电流保护方法有效性的负面影响,介绍了有功电流差动保护方法的原理,表明该方法对系统参数的变化和不稳定谐波的影响较小。同时,在PSCAD平台上进行了仿真,探讨了该方法在AC输电线路各种故障类型情况下的应用。仿真结果表明,有功电流差动保护可以提高UHVAC-DC互联系统的保护灵敏度。
中文关键词:特高压交直流  基波电流  差动保护  特征谐波
 
Research on Differential Protection of UHVAC-DC Interconnected System
Abstract:The rapid development of UHVAC-DC interconnected system makes harmonics more unstable. This paper mainly studies the application of active current differential protection in UHVAC-DC interconnected system. The negative influence of UHVDC transmission on the effectiveness of traditional current protection method is analyzed. The principle of active current differential protection method is introduced. It shows that the method has less influence on the variation of system parameters and unstable harmonics. On this basis,the simulation is carried out on the PSCAD platform,and the application of this method in AC transmission line under various fault types is discussed. The simulation results show that active current differential protection can improve the protection sensitivity of UHVAC-DC interconnected system.
keywords:UHVAC-DC  fundamental current  differential protection  characteristic harmonics
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