一种基于双端电压相量测量的故障测距新算法  

Fault locating based on dual-terminal voltage measurement

作　　者：宋振红[1] 张举[1] 唐杰[2] 

机构地区：[1]华北电力大学电气工程学院,河北保定071003 [2]保定供电公司,河北保定071000

出　　处：《电力自动化设备》2006年第6期27-29,共3页Electric Power Automation Equipment

摘　　要：基于测距方法的研究,提出了一种仅利用线路两端电压相量实现测距的新方法,根据故障后各节点组成的电压变化量矩阵方程求得故障距离。采用全球定位系统(GPS)提供的时间为基准,利用同步相量测量单元(PMU),对电力系统不同节点电压基波相量进行同步测量,借此技术可以解决高压输电线路两端相量测量的同步问题,同步精度可达1μs,能够满足实际电力系统故障测距精度的要求。由于仅利用电压相量进行测距,消除了由于电流互感器饱和所带来的测距误差,并且可以应用于对称和不对称高压输电线路中。仿真结果表明该方法增强了双端测距的灵活性,测距精度高,并且避免了由电流互感器饱和所造成的测距误差。A new fault locating method using only synchronized voltage measurements at both ends of the transmission line is presented based on the analysis of fault locating methods,which determines the fault distance by solving node voltage variation matrix equations after fault. The GPS（Global Position System） is used to provide the reference time and the synchronous PMU （Phasor Measurement Unit） to synchronously measure node voltage fundamental phasors with the precision of 1μs,meeting practical requirements of fault locating. Thus synchronized phasor measurements at both ends of the high-voltage transmission line are realized. As only the voltage phasor is needed,the method eliminates the inherent error clue to the current transformer saturation. It can be used to both symmetrical and asymmetrical high-voltage transmission lines. Results show that the flexibility and accuracy are improved.

关 键 词：节点阻抗矩阵 故障测距 同步相量测量 EMTP 

分 类 号：TM711[电气工程—电力系统及自动化]