直流输电线路极波变化率保护的拓展方法研究  

Research on Extension Method of Polar Wave Change Rate Protection for HVDC Transmission Line

作　　者：甄永赞[1] 苏宁赛 杨荆宜 ZHEN Yongzan;SU Ningsai;YANG Jingyi(Department of Electric Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;Substation Maintenance Center of State Grid Hubei Maintenance Company,Wuhan 430050,Hubei Province,China)

机构地区：[1]华北电力大学电力工程系,河北省保定市071003 [2]国网湖北检修公司变电检修中心,湖北省武汉市430050

出　　处：《中国电机工程学报》2021年第15期5212-5220,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51307056)。

摘　　要：针对ABB直流输电线路行波保护耐受过渡电阻能力低,灵敏度不高的问题,该文提出改善上述问题的方法。ABB行波保护中极波变化率可视为二维矢量与相邻极波数据点的内积,该文构造多维矢量或多维矩阵,并拓展每次计算中极波数据点数量,采用矢量和矩阵计算得到极波广义变化率,并将该极波广义变化率作为保护动作的判据。通过PSCAD/EMTDC仿真,验证了所提行波保护改进方法对LCC-HVDC线路和MMC-HVDC线路接地故障的有效性。当接地电阻为100?时,文章方法较原方法灵敏度分别提升约28和19倍。算例表明,所提行波保护改进方法对行波保护区内接地故障具有较高的灵敏度和耐受过渡电阻能力,并且适用于LCC-HVDC输电线路和MMC-HVDC输电线路。Aiming at the problems of low tolerance to transition resistance and low sensitivity of ABB DC transmission line traveling wave protection,this paper proposed a method to improve the above problems.The change rate of polar wave in ABB traveling wave protection can be regarded as the inner product of two-dimensional vector and adjacent polar wave data points.This paper constructed a multidimensional vector or multidimensional matrix,and expanded the number of polar wave data points in each calculation.The vector and matrix were used to calculate the generalized rate of the change of the polar wave,and the generalized rate of the change of the polar wave was used as the criterion for protective action.Through the PSCAD/EMTDC simulation,the effectiveness of the proposed improved method of traveling wave protection to the ground fault of LCC-HVDC line and MMC-HVDC line was verified.When the grounding resistance was 100?,the sensitivity of this method was improved by about 28 times and 19 times respectively compared with the original method.The calculation example showed that the improved method of traveling wave protection proposed in this paper has high sensitivity and resistance to transition resistance to ground faults in the traveling wave protection zone,and was suitable for LCC-HVDC transmission lines and MMC-HVDC transmission lines.

关 键 词：行波保护 矩阵计算 高压直流输电 柔性直流输电 

分 类 号：TM721[电气工程—电力系统及自动化]