摘要
同塔并架高压直流线路技术应用前景广阔。文中重点研究直流线路布置方式和故障形式对同塔并架直流线路故障识别和保护配置影响,提出综合应用等值电网求解、交流电网直流主回路电磁暂态建模、典型故障模式抽取等技术,建立仿真平台,研究典型故障特性下直流线路行波、突变量、直流欠压和纵差等保护特征值,分析直流线路保护影响因素和规律。研究表明:现有直流线路保护可有效识别大部分故障,但识别特定导线布置特定故障存在困难。建议直流工程线路设计中,避免采用特定导线布置,提高线路保护识别和响应故障能力。该研究可支撑直流工程设计、建设、运行和维护,具有推广和应用价值。
As for the multi HVDC transmission lines on the same tower,with a wide application prospect,research on how the fault identification and protection configuration are influenced by the HVDC line layout and fault mode is important to the safe and reliable operation.Devise methods are comprehensively applied in the simulation platform establishment,including the AC grid equivalent,digital electromagnetic transient models establishment,typical line fault’s simulation scheme,and so on.The characteristics of dc line protection such as traveling wave,derivative,dc under-voltage and longitudinal difference ones,in typical faults are studied,influence mechanism and change performance are explored.The results show that the existing dc line protection can effectively identify most typical faults,while it is difficult to identify the specific fault of the specific conductor layout.In the dc lines design,specific conductor layout is suggested to be avoided aiming at improving identification and response ability of dc line protection on fault.Considering the solid theoretical foundation,clear research route,the proposed technical routine will support design,construction,operation and maintenance,is valuable for engineering application.
作者
刘云
LIU Yun(State Grid Brazil Holding S.A.,Rio de Janeiro 20071004,Brazil)
出处
《电力工程技术》
2019年第3期163-169,共7页
Electric Power Engineering Technology
