大规模电力系统分区动态等值的快速直接暂态稳定分析

本文对大规模电力系统中确定的研究区，用同调动态等值法将外部系统进行动态等值，然后 对研究区中的所有故障点，用综合直接法进行暂态稳定“扫描”分析，并将计算结果与仿真 法进行了比较，最后给出了系统在等值前后直接法计算所用计算机CPU时间比较。计算表明 ，本文提出的基于动态等值的直接暂稳分析方法不但保证了直接暂稳分析的计算精度，而且 大大提高了直接法的计算速度，具有在线应用的潜力。

FAST DIRECT TRANSIENT STABILITY ANALYSIS BASED ON DYNAMIC EQUIVALENTS OF THE LARGE SCALE POWER SYSTEMS

In this paper, we first divide the system into different study areas according to the needs of stability analysis, and then, for external system of each study area, we use coherency-based dynamic e-quivalents method carrying out dynamic equivalent to form different reduced study subsystems of primary system. After that, for all fault cases of study area of each subsystem, we carry out transient stability 'scanning screen' analysis using direct transient stability analysis synthetic method which is higher accuracy and reliability.The proposed approach has been tested by two different power systems. Calculation results have' been compared with time domain simulated method, and CPU time has been measured. The results in this paper indicate that the proposed method is very fast and higher reliability, it can meet the needs for on-line dynamic security analysis of the large scale power systems.