大型电力系统非全相振荡时任意时刻电气量的快速计算

基于双口网络理论，对继电保护整定计算过程中大型电力系统非全相振荡时任意时刻正序网断相口开路电压的计算方法进行了深入研究，提出了一种能自动适应电力系统网络操作，可快速计算大型电力系统非全相振荡时任意时刻正序网断相口开路电压的新方法，并应用这一方法解决了继电保护整定计算中快速计算大型电力系统非全相振荡时任意时刻电气量的问题。该方法在保留现有方法优点的基础上，可显著提高计及网络操作时大型电力系统非全相振荡时任意时刻电气量的计算速度和计算效率，可满足大型电力系统继电保护在线整定计算的需要。

FAST CALCULATION OF ELECTRIC PARAMETERS OF A LARGE-SCALE POWER SYSTEM DURING THE OSCILLATION CAUSED BY ASYMMETRICAL OPEN-CONDUCTOR FAULTS

In this paper, the method to calculate the open-port voltage of positive sequence network during a large-scale power system oscillation caused by asymmetrical open-conductor faults is carefully studied. Considering the changes of a power system in topology and on the basis of the two-port network theory, a fast method to calculate the open-port voltage of positive sequence network during a large-scale power system oscillation, which is caused by asymmetrical open-conductor faults, is presented. The method needs not modifying the sequence impedance matrices of original networks. On this basis, fast calculation of the faulted voltages and currents of a large-scale power system oscillation caused by asymmetrical open-conductor faults is realized for relay setting and coordination. Compared with the existing method, the proposed method can apparently improve the speed and efficiency of solving the problem of a large-scale power system oscillation caused by asymmetrical open-conductor faults, and can meet the needs of relays on-line setting and coordination in a large-scale power system. This project is supported by Foundation for University Key Teachers by the Ministry of Education (No. GG-0808-10188-1039).