基于随机子空间法和固有频率法的线路故障定位
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摘要
输电线路发生故障后,进行准确快速的故障距离判断在实际生产运行中具有很大的意义。线路故障后,将产生一系列的故障暂态行波,且从频域的角度看,行波可看作为谐波形式。提出基于随机子空间法和行波固有频率法相结合的方法进行线路故障定位。首先通过相模变换得到输电线路中的模电流分量,然后基于随机子空间算法进行辨识得到行波固有频率,进而计算此频率下的行波波速和模阻抗导纳矩阵,最后可求得故障距离。在PSCAD中搭建两端系统仿真模型,经过仿真验证表明,此方法可有效进行线路故障定位,且准确度较高。
The question of how to judge fault distance accurately and rapidly has great significance in the actual production run when a short circuit fault of transmission lines happens. When faults happen they produce transient state travelling waves. The frequency spectra of travelling waves are a fundamental characteristic frequency. This paper research on fault location is based on stochastic subspace identification and the natural frequency of traveling waves. Firstly,we use module current component based on phase-mode transformation,secondly we identify the natural frequency of traveling waves based on stochastic subspace identification. Then we calculate the wave velocity and module impedance admittance matrix at the natural frequency. Finally,we arrive at the distance to fault.Building the two-terminal system using PSCAD program,the simulation' s result show the way to find fault location with high accuracy.
引文
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