同杆双回线故障分析新方法研究

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.

RESEARCH ON FAULT ANALYSIS OF DOUBLE CIRCUIT LINES ON THE SAME TOWER

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.