多端柔性直流电网输电线路群分解能量熵单端方向保护研究  

Research on Single-end Direction Protection of Group Decomposition Energy Entropy of Transmission Lines in Multi-terminal Flexible DC Grid

作　　者：欧阳聂庆 陈仕龙[1] 张梓航 毕贵红[1] 杨毅[1] OUYANG Nieqing;CHEN Shilong;ZHANG Zihang;BI Guihong;YANG Yi(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China;Transmission and Inspection Branch of State Grid Xiangyang Power Supply Company,Xiangyang 441000,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]国网襄阳供电公司输电运检分公司,湖北襄阳441000

出　　处：《电力科学与工程》2025年第2期1-12,共12页Electric Power Science and Engineering

基　　金：国家自然科学基金资助项目(52067009)。

摘　　要：针对多端柔性直流输电电网线路保护问题,提出一种基于电压电流突变方向结合SWD(Swarm decomposition)能量熵的柔性直流系统输电线路保护方法。分析了多端柔性直流输电线路边界频率特性,以及线路不同位置发生故障时保护装置处电压、电流突变量方向的极性差异,计算了柔性直流系统输电线路故障SWD能量熵值。根据柔性直流系统输电线路故障时电压突变量方向特性、电流突变量方向特性,得到电压突变量方向判据、电流突变量方向判据,从而得到故障方向判据;提出基于暂态线模电流SWD能量熵的柔性直流系统输电线路区内、区外故障判据,以及多端柔性直流电网输电线路群分解能量熵单端方向保护方案。在仿真平台上搭建多端柔性直流输电电网模型,通过仿真算例验证了所提保护方案下系统在不同的故障极、不同的故障位置以及不同的过渡电阻下动作可靠性。In order to solve the problem of line protection in multi-terminal flexible HVDC power grid,a method of transmission lines protection in flexible HVDC system based on voltage and current abrupt direction combined with SWD(Swarm decomposition)energy entropy is proposed.The boundary frequency characteristics of multi-terminal flexible DC transmission lines,as well as the polarity difference in the direction of voltage and current fault component at the protection device when the fault occurs at different locations of the line are analyzed.The SWD energy entropy of the fault of the flexible DC transmission lines is calculated.According to the directional characteristics of voltage and current fault component when the transmission lines of the flexible DC system is faulty,the direction criterion of voltage and current fault components are obtained,and then the fault direction criterion is obtained.The fault direction criterion of the transmission lines of the flexible DC system is proposed based on the transient line mode current SWD energy entropy,and the single-end direction protection scheme of group decomposition energy entropy in multi-terminal flexible DC grid is proposed.A multi-terminal flexible HVDC power grid model is built on the PSCAD/EMTDC simulation platform,and the operational reliability of the system under the proposed protection scheme is verified under different fault poles,different fault locations and different transition resistors by simulation examples.

关 键 词：多端柔性直流 输电线路 群分解算法 能量熵 单端方向保护 

分 类 号：TM773[电气工程—电力系统及自动化]