基于序阻抗法的配电线路参数识别与仿真研究

Research on Distribution Line Identification and Simulation Based on Sequence Impedance Method

配电网现场故障试验一般不可频繁重复,工况较为单一,提出一种基于序阻抗法的线路参数识别与故障波形重现方法,构建可进行重复故障仿真验证的线路序阻抗数字模型,在现场试验过程所获得的各个节点数据的基础上,采用对称序分量的计算原理,得出现场所有试验线路段的π型等效电路的正序阻抗和零序阻抗参数,对现场真实线路进行数字化建模,仿真验证结果表明,采用该方法得到的短路接地故障与原故障波形具有极高的相似度,验证了该线路参数识别与故障波形重现技术的实用性。

The field fault test of distribution network cannot be repeated frequently,a line parameter identification and fault waveform reproduction method based on sequence impedance method is proposed to build the line sequence resistance model,and theπtype equivalent lines are constructed.Based on the data of each node obtained in the field test process,the positive sequence impedance and zero sequence impedance parameters ofπtype equivalent circuits of all line sections are obtained by using the principle of symmetrical sequence components,and the digital model of the real lines in the field is established.The simulation results show that the short circuit ground fault obtained by this method has a high similarity to the original fault waveform,which verifies the practicability of the line parameter identification and fault waveform reproduction technology.