与波速无关的柔性直流输电线路单端行波故障测距算法  

Fault-location Method for VSC-HVDC Transmission Line One-Terminal Traveling Waves Unrelated to Wave Speed

作　　者：杨立红[1] 杨明玉[1] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,河北保定071003

出　　处：《电力科学与工程》2013年第6期12-16,22,共6页Electric Power Science and Engineering

摘　　要：基于行波测距原理,提出一种不受波速影响的柔性直流输电线路单端故障测距算法。由于柔性直流输电线路两侧并联大电容,行波在母线处发生全反射。通过对波头的跳变强度和极性,以及在时间轴上的位置关系等3个方面进行分析,为初始反行波和初始前行波首次到达母线测点的时间、以及初始反行波经故障点反射后第二次到达测点的时间的识别和标定提出一套可靠依据,进而推导出一种测距算法。PSACD仿真结果表明,该算法原理正确,具有较高的测距精度。An accurate fault locating method for voltage sourced converter HVDC （VSC-HVDC） transmission line based on one-terminal traveling waves fault location principle is presented, which avoids the influence of traveling wave speed. As the impact of the shunt capacitor on both sides of the DC lines in VSC-HVD, total reflection of cur- rent traveling wave occurs at both DC busbars. Based on amplitude, polarity and location of the traveling wave front on time axis, three time points can be identified and calibrated, two of them are the moment when the backward traveling wave arrive at local measuring point for the first and the second time, the third is the moment when the forward traveling wave due to the first reflection at opposite DC busbar arrives local measuring point. The fault loca- tion can be implemented according to the three moments. The PSCAD-based simulation results show that the princi- ple of the proposed algorithm is correct and using this algorithm the fault location accuracy is higher.

关 键 词：柔性直流输电 单端 行波 故障测距 

分 类 号：TM77[电气工程—电力系统及自动化]