摘要
配电网发生故障时,故障馈线支路准确辨识及准确测距是实现恢复供电的基础。针对常见的单端辐射状配电网故障时行波在电网中传递特点,异地同步监测各个出线末端的电压行波信号,优化小波分析函数准确获取行波波头抵达时刻,在此基础上提出了一种基于广域行波初始波头时差关系矩阵的配电网故障选线方法。该方法首先建立各个馈线支路间初始波头到达时差(time difference of arrival,TDOA)矩阵,然后根据故障时各支路波头实际TDOA矩阵,计算各线路矩阵谱范数大小,通过谱范数值差别找出故障馈线,并利用初始波头时刻数据实现故障测距。实验分析结果表明,在考虑同步测量时间误差的情况下能准确判断故障馈线并实现故障测距。
Accurate fault line selection and location is key point to ensure fast recovery of power supply while fault occurs. Firstly, we analyzed the characteristics of traveling waves produced by fault in the single-ended radial distribution power network in detail. Secondly, by synchronously monitoring the voltage traveling waves at the end of each branch, the arrival times of the first transient traveling wave were acquired by optimizing and utilizing wavelet analysis. On the basis of the above work, a new fault feeder selection scheme on this was proposed. The proposed scheme establishes a matrix of the time difference of arrival（TDOA） among the first transient traveling wave of every feeder. Moreover, another matrix was established according to the actual time difference when fault occurred. Choosing the fault feeder by calculating the rank of every feeder＇s matrix and using the first transient traveling wave can realize fault location. Experimental results show that the proposed scheme has a high accuracy in selecting the fault feeder and location even if considering the situation of time synchronism error and so on.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第11期3411-3417,共7页
High Voltage Engineering
基金
中国博士后科学基金(2013M531427)
中央高校基本科研业务费专项资金(2011QNA19)~~
关键词
配电网
同步
行波
TDOA矩阵
故障选线
测距
distribution power network
synchronous
traveling wave
TDOA matrix
fault line selection
fault location
