摘要
该文基于六序分量法及多口网络理论,从故障的一般形式出发,提出了一种适用于同杆并架双回线的通用故障计算模型.利用该模型可同时求出六序故障端口电流,进而求出各节点注入电流,利用节点阻抗矩阵即可求出网络内各节点电压及各支路电流.文中还给出了该算法的理论推导及结果,并将其仿真结果与EMTP进行了比较.大量仿真计算表明:该算法不仅适用于简单故障的分析计算,亦适用于多重复杂故障及经任意故障阻抗、任意故障类型的故障分析和计算,且不需要考虑复合序网的连接及故障特殊相问题;当线路阻抗参数标幺值在0.1～10范围内变化时,用有限值400～500代替无穷大,可获得足够的精确度.该算法简单、实用、有散,易于实现.
The paper proposed a general computer model for faults on a double-circuit line in electric power systems based on a six sequence component and the multi-port network theory according to the general form of a fault. Using the model, the six sequence currents for fault ports can be got on the same time, and then the node-injected currents could be wrote. Therefore the node voltages and branch currents can be calculated using the node impedance matrix. The paper showed the deduce procedure and conclusion, and made a computer simulations. The simulating results were compared to EMTP. The proposed method is suited to all kinds of simple faults or complex faults, and also suited to a fault with any fault impedances. A great deal of practical experiences show that substituting infinite elements with j400-jS00 will get enough precision when a line impedance in per unit varies in the range of 0.1 and 10. The mathematical model is simple, practical and general, and easy to realize by computer.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第20期68-71,共4页
Proceedings of the CSEE
关键词
电力系统
同杆双回线
故障计算
六序分量
Power system
Double-circuit lines
Fault calculation
Six-sequence component
