多端柔性直流电网保护关键技术

发布时间：2018-03-22 15:33

本文选题：多端柔性直流电网　切入点：直流线路保护　出处：《电力系统自动化》2016年21期 　论文类型：期刊论文

【摘要】：多端柔性直流电网直流故障后故障电流快速上升、无自然过零点等特点使得直流线路保护和故障处理技术成为柔性直流电网发展的关键技术难点。理论分析了多端柔性直流电网线路保护的特殊性,借鉴传统直流输电线路保护原理和点对点式柔性直流输电线路保护原理的研究现状,对多端柔性直流电网线路保护的发展方向进行了探讨。同时,全面分析了各类直流故障隔离方法的基本原理,从故障隔离能力、经济性、控制保护耦合影响等多个方面阐述了其进一步的发展趋势。最后,考虑到架空线路输电的应用前景,设计提出了一种适用于点对点式柔性直流输电系统、具有低电流危害的新型故障重合闸判断方法,较现有重合闸策略而言,该方法重合于永久性故障时能够彻底避免对系统的二次过电流冲击。在此基础上,讨论了多端柔性直流电网对重合闸策略的性能要求。
[Abstract]:The fault current of multi-terminal flexible DC network rises rapidly after DC fault. The characteristics of no natural zero crossing make DC line protection and fault handling technology become the key technical difficulties in the development of flexible DC network. The particularity of multi-terminal flexible DC network line protection is analyzed theoretically. Based on the research status of traditional DC transmission line protection principle and point-to-point flexible direct current transmission line protection principle, the development direction of multi-terminal flexible DC network line protection is discussed. The basic principle of all kinds of DC fault isolation methods is analyzed, and its further development trend is expounded from the aspects of fault isolation ability, economy, control protection coupling effect and so on. Finally, considering the application prospect of overhead transmission line, A new fault reclosing judgement method, which is suitable for point to point flexible direct current transmission system with low current hazard, is designed and proposed, compared with the existing reclosing strategy. This method can avoid the secondary overcurrent shock when the fault is permanent. On this basis, the performance requirements of the reclosing strategy for the multi-terminal flexible DC network are discussed.
【作者单位】：智能电网教育部重点实验室(天津大学);南京南瑞继保电气有限公司;
【基金】：国家高技术研究发展计划(863计划)资助项目(2015AA050101)~~
【分类号】：TM721.1

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