摘要
低压直流配电网故障区域定位对测控装置采样精度和速率要求高,存在阈值整定困难的问题,阻碍了低压直流配电网的发展利用。针对以上问题,提出了基于故障信号能量的低压直流配电网故障区域定位方法。对故障信号进行离散小波变换后得出小波高频系数,再提取能量突变系数对小波高频系数进一步计算,并由能量突变系数表征故障信号突变特征与方向特征,提出故障信号能量突变方向判据,结合测控装置间的信息交互实现故障区域定位。在MATLAB/Simulink中搭建双端式低压民用直流配电系统进行仿真,制作了测控装置硬件,在硬件中实现了提出的算法,并基于RT-LAB进行了硬件在环测试,仿真与测试验证了该方法可以有效地实现故障区域定位。与传统的基于信号与阈值之间大小关系的判定方法不同,该方法从故障信号特征出发,对阈值整定和测控装置的性能要求更低。
Currently,the accuracy of fault area localization in low-voltage DC distribution systems has the problems of high sampling precision and rate requirements of measurement and control devices,as well as the difficulty in setting appropriate threshold values,which hinders the development and utilization of low-voltage DC distribution systems.To address these issues,a fault area localization method based on the energy of fault signals is proposed.The fault signals are subjected to discrete wavelet transform to obtain wavelet high-frequency coefficients.An energy mutation coefficient is introduced to further calculate the wavelet high-frequency coefficients.The energy mutation coefficient characterizes the mutation and directional features of the fault signals,and a criterion based on the energy mutation direction is proposed for fault signal localization.By combining the information exchange among measurement and control devices,fault area localization is achieved.A simulation experiment is conducted on a dual-end low-voltage DC distribution system using MATLAB/Simulink.Hardware devices for measurement and control are developed to implement the proposed algorithm.Hardware-in-the-loop experiments are carried out using RT-LAB to simulate and validate the effectiveness of the proposed method for fault area localization.Unlike traditional methods that rely on the relationship between signal amplitudes and threshold values,this method focuses on the characteristics of fault signals,requiring lower threshold setting and performance requirements for measurement and control devices.
作者
张辉
崔恺聪
潘东
邓其军
ZHANG Hui;CUI Kaicong;PAN Dong;DENG Qijun(Economic and Technological Research Institute of State Grid Anhui Electric Power Co.,Ltd.,Hefei 230022,China;School of Electrical Engineering and Automation Wuhan University,Wuhan 430072,China)
出处
《供用电》
北大核心
2024年第1期66-73,共8页
Distribution & Utilization
基金
国网安徽省电力有限公司科技项目(B31209220002)。
关键词
低压直流配电网
双端式拓扑结构
小波变换
故障区域定位
硬件在环测试
LVDC distribution network
double-ended topology
wavelet
fault area localization
hardware in the loop experiment
