基于测量波阻抗的高压直流输电线路纵联保护

发布时间：2018-01-07 12:22

本文关键词：基于测量波阻抗的高压直流输电线路纵联保护　出处：《电网技术》2017年02期 　论文类型：期刊论文

【摘要】：针对目前直流输电线路保护灵敏性和速动性难以兼顾的问题,提出一种基于测量波阻抗的直流线路保护方法。利用S变换提取单频率的电压、电流初始行波并计算线路两端的测量波阻抗。在线路内部故障时,线路两端测量波阻抗均为测点背侧等效阻抗,差异较小;在线路外部故障时,线路两端测量波阻抗分别为测点背侧等效阻抗和线路波阻抗,差异较大,据此可以区分直流线路上的内部和外部故障。基于PSCAD/EMTDC的大量仿真结果表明,该保护方法易于整定,在各种故障情况下均能可靠、快速地识别直流线路内部和外部故障。
[Abstract]:Aiming at the difficulty of considering the sensitivity and speed of DC transmission line protection at present, a DC line protection method based on measuring wave impedance is proposed. The voltage of single frequency is extracted by S-transform. The current initial traveling wave and the measurement wave impedance at both ends of the line are calculated. In the fault of the line, the measured wave impedance at both ends of the line is the equivalent impedance at the back of the measuring point, and the difference is small. In the external fault of the line, the wave impedance measured at both ends of the line is the equivalent impedance of the back side of the measuring point and the line impedance impedance respectively, and the difference is great. A lot of simulation results based on PSCAD/EMTDC show that the protection method is easy to adjust and can be reliable in all kinds of fault cases. Fast identification of internal and external faults on DC lines.
【作者单位】：国网四川省电力公司电力科学研究院;中国电力科学研究院;
【基金】：中国博士后科学基金(2016M592659)~~
【分类号】：TM75;TM77
【正文快照】： 0引言高压直流输电广泛应用于远距离、大容量输电和电力联网中,为实现跨区电力资源的优化配置发挥了十分重要的作用。由于直流线路送电距离长,沿途环境复杂,气候条件各异,相对于其他直流场设备,直流线路发生故障的概率较大;因此,直流线路保护对保障直流系统的安全运行至关重

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