电力系统低频振荡期间对三相短路故障的识别  

Identification of Three-phase Short-circuit Fault During Low Frequency Oscillation in Power System

作　　者：张亮 ZHANG Liang(Xinjiang Chiyu Electric Power Engineering Consulting Limited.Urumqi 830000,China)

机构地区：[1]新疆驰誉电力工程咨询有限公司,新疆乌鲁木齐830000

出　　处：《电力勘测设计》2024年第2期28-34,65,共8页Electric Power Survey & Design

摘　　要：本文提出了一种检测距离保护对称故障的方法,在保证保护装置选择性的同时,克服了原有保护算法的缺点。首先介绍了数据预处理的过程。其次提出了检测故障电流直流分量的算法。最后通过PSCAD仿真多种故障以及系统振荡来验证算法的可靠性。仿真结果表明此算法能够有效辨识出系统振荡期间线路发生的三相对称短路故障。本算法可用于监测电力系统在低频振荡情况下距离保护装置的工作情况。A new symmetrical fault detection method for distance protection is proposed to maintain the selectivity of the protection device and overcome some shortcomings of the original protection latching algorithm.Firstly,the preprocessing process of the sampled data and the method of extracting the current waveform components using the matrix beam algorithm are briefly introduced.Secondly,an algorithm for judging faults by detecting the DC component in the current is proposed.Finally,the true reliability of the algorithm is verified by PSCAD simulation of various faults and system oscillations.The results show that this algorithm can effectively identify the three symmetrical shortcircuit faults that occur during the oscillation of the system,and can be used to monitor the operation of the distance protection device of the power system under the condition of low-frequency oscillation.

关 键 词：低频振荡 矩阵束算法 阻尼 电力系统 

分 类 号：TM712[电气工程—电力系统及自动化]