不同步双端数据修正波速的单端行波测距算法研究

Single-terminal traveling wave location algorithm based on amending wave velocity

为了降低当前行波故障测距方法存在的同步精度要求高、通信量大、无法确定实际波速等缺点,并提高测距系统的容错率和可靠性,提出一种不同步双端数据修正波速的单端行波定位方法。通过分析行波折射和反射的极性变化,并引入零模、线模波速差原理辅助判据,确立接收扰动下的单端入射波和对端反射波的时间差,进一步根据双端的这个时间差修正波速,最后利用修正波速和单端时间差可精确实现故障定位。本算法综合单端易于时间精确同步和双端修正波速的优点,降低了双端行波故障测距方法对高精度双端时间同步要求,同时双端仅交换单端时间差信息,降低了通信的依赖性。仿真比较结果显示所提出的方法具有很高的定位精度,受时间同步和波速的影响小。

In order to solve those problems, for example high precision synchronization requirements, heavy traffic, and uncertainty of wave velocity, and at the same time improve the tolerance rate and reliability of the location system, this paper presents a new method for single-terminal traveling wave location with amended wave velocity by two-terminal asynchronous data. By analyzing the changes of polarity of the wave after catadioptric and introducing zero-modulus and line modulus wave velocity contrast as auxiliary criterion, it counts the time-lag between initial wave and reflected wave from remote bus under receiving disturbance, then amends the value of wave velocity through this time-lag of two terminals, finally uses the amended velocity and time-lag of single terminal to locate the fault accurately. This algorithm integrates the advatages of single-terminal data easy to time synchronization and two-terminal data amending the wave velocity, reduces high precision time synchronization required by the two-terminal traveling wave fault location; and at the same time two terminals only exchange time-lag of single terminal, which will reduce the communication dependency. PSCAD/EMTDC simulation show that this method has high precision for fault location, and also decreases the negative influence made by wave velocity and time synchronization.