基于矩阵束算法的经消弧线圈接地系统故障选线新方法

从线性电路的动态响应入手,定性分析了经消弧线圈接地系统发生单相接地故障时暂态零模网络外加激励源信号的构成,并研究了在此外加激励源下各条线路暂态零模电流的全响应,提出了一种利用暂态零模电流全响应中的强制分量进行群比的暂态选线方法。该方法利用矩阵束算法对故障后各条线路暂态零模电流进行频率分析,提取出各条线路暂态零模电流强制分量中暂态特征最明显的频率分量进行选线。该方法无需滤波,可真实反映出故障暂态信号的组成,具有抗噪能力强、计算速度快等优点。此外,该方法仅用到电流量,可靠性高。ATP仿真结果验证了该方法的有效性。

New Method for Fault Line Selection in Non-solidly Grounded System Based on Matrix Pencil Method

Based on linear circuit dynamic response,the analysis of the components of transient zero-mode network excitation source is presented.The full transient response of zero-mode current under that source is also analyzed.Based on the group comparison of the zero-mode transient current mandatory components a transient fault line selection method is proposed.The method conducts frequency analysis using the matrix pencil algorithm and then obtains the frequency components which have the most obvious transient characteristics to select the fault line.This method doesn’t need digital filter and can reflect the real composition of the fault transient signals.This method has also high noise immunity and fast computing speed.Moreover,this method only uses the current to select fault line,so it has high reliability.ATP simulation results show that the proposed method is effective and reliable.