风电场并网输电线路单相接地故障单端测距方法

发布时间：2018-04-16 01:04

本文选题：输电线路 + 故障测距　；参考：《电力系统自动化》2017年10期

【摘要】：采用故障后及单相跳闸后2个时间断面的信息构建方程描述输电线路两侧断路器之间的网络拓扑,能够实现输电线路故障单端精确测距。但该方法假设2个时间断面下量测点对端系统阻抗保持不变且故障支路恒定,使得现有立足风电场并网输电线路系统侧开展测距的常规做法失效。针对该问题,提出了立足风电场侧面向于系统侧开展测距研究的思路,克服了量测点对端系统阻抗在2个时间断面下变化的问题;针对测距算法中使用迭代搜索解法带来的风电场侧电流量测值偏小导致的高阻故障测距精度显著下降的问题,提出了不受故障类型影响的直接求解方程测距新算法,能够直接计算得到故障距离和过渡电阻值,不仅实现了精确测距且对于后续的自适应重合闸研究提供了新思路。
[Abstract]:The information construction equation of two time sections after fault and single phase tripping is used to describe the network topology between the circuit breakers on both sides of the transmission line, which can realize the accurate fault location of the single end of the transmission line.However, this method assumes that the impedance of the measuring point to the end of the system remains constant and the fault branch is constant under two time sections, which makes the existing conventional method of ranging based on the wind farm connected to the transmission line side of the transmission line fail.Aiming at this problem, the paper puts forward the idea of distance measurement research based on wind farm side to system side, and overcomes the problem that the impedance of measurement point to end system changes under two time sections.In order to solve the problem that the precision of high resistance fault location caused by the low current value of wind farm side caused by the iterative search method in the fault location algorithm, a new direct solution equation location algorithm, which is not affected by the fault type, is proposed in this paper.It can directly calculate the fault distance and the transition resistance, which not only realizes the accurate location, but also provides a new idea for the subsequent study of adaptive reclosing.
【作者单位】：清华大学电机工程与应用电子技术系;电力系统及发电设备控制和仿真国家重点实验室清华大学;国网冀北电力有限公司电力科学研究院;
【基金】：国家自然科学基金资助项目(51477084) 电力系统国家重点实验室自主课题(SKLD16Z07)~~
【分类号】：TM75

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