利用单端母线的电压暂降特征进行配电网故障定位  

Fault Location in Distribution Network Based on Voltage Sag of Single-end Bus

作　　者：郑天文[1] 肖先勇[1,2] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]智能电网四川省重点实验室,四川成都610065

出　　处：《四川电力技术》2011年第5期9-13,共5页Sichuan Electric Power Technology

摘　　要：提出一种"离线仿真,在线定位"的故障定位方法,根据线路在不同位置发生不同短路故障时会引起母线处发生不同的电压暂降的特点,对这一特定的配电网络建立仿真模型,进行仿真,得到配电网中各个支路的故障区段定位函数和故障测距函数,录入仿真数据库。当配电网中发生实际短路故障时,根据母线处采集的电压波形或者数据,得到故障后第二周波的电压暂降幅值和相位跳变,将其代入仿真数据库中,利用模式识别确定故障区段,利用解析式法求得故障距离。通过对10 kV配电系统进行金属性和非金属性单相接地短路故障的仿真,结果证明了该故障定位方法的准确性和可靠性。A fault location method is proposed, that is, simulating off- line and locating on -line. Based on that when different fault occurs at different location, the bus will experience different voltage sag, a simulation mode is established for a special distribution network to obtain the location function and fault distance function in fault section of all the branches of distri- bution network. Then these data are recorded into the simulation database for further use. When a real short - circuit fault oc- curs in distribution network, it only uses the voltage waveform or data that are acquired at the bus, the sag magnitude and phase shift value can be obtained, then they are substituted into the simulation database, the fault branch and the fault dis- tance can be obtained through pattern recognition and analytic method respectively. Through the simulation for 10 kV distribution network with bolted and non - bolted single - phase earth short - circuit fault, it proves the accuracy and reliability of the proposed fault location method.

关 键 词：配电系统 电压暂降 单端法 仿真数据库 故障定位 

分 类 号：TM744[电气工程—电力系统及自动化]