配电网行波信号的获取方法研究

Study on the Acquisition Method of Traveling Wave Signal in Distribution Network

首先介绍在配电网中使用行波法进行故障测距的必要性,其次分析故障时产生的暂态电压行波特征,得到故障信号对于获取暂态行波信号互感器的要求,再次建立电流互感器和电压互感器的高频等效电路,得到其传递函数,进而分析电流互感器、电压互感器的行波传变特性。结合配电网线路结构使用基于图论的方法合理配置行波测距装置的安装位置,利用ATP进行仿真分析。最后以实际铁路线路为例进行MATLAB仿真,验证了整体方案的正确性。

First,the necessity of using traveling wave method in distribution network for fault distance measurement is introduced, and then the characteristic of the transient voltage traveling wave generated in the fault to obtain the requirement of the fault signal for acquiring the transient traveling wave signal transformer is analyzed.And then establish a high-frequency equivalent circuit of the current transformer and the voltage transformer to obtain the transfer function is establisked,with further analysis of the traveling wave propagation characteristic of the current transformer and the voltage transformer.Then, the installation position of the traveling wave distance measuring device is rationally configured by using the method of graph theory in combination with the network structure of the distribution network ,and the simulation analysis is carried out by using ATP.Finally,taking the actual railway line as example,the MATLAB simulation is carried out with the correctness of the whole scheme being verified.