Power System Stability Analysis & Control Based On Static Voltage Security Region

It is obvious that power system stability is the basic requirement for a modern society. As an important part of power system, transmission system has a close relationship to its stability and security. And, the efficiency, reliability, stability and economy of the whole system depend on the coordination of generation, transmission and distribution. With the rapid development of the power system, its stability and security have been paid much more attention not only in the industries but also in the academies. In this thesis, static voltage stability has been studied.Traditionally, almost all achievements on power system stability assessment were based on“point wise”method. With this method, for any contingency and any change to power system, stability analysis will be carried out. So it is slow and with low efficiency. In this thesis,“region wise”method will be used to handle the voltage stability assessment. A minimum load shedding method and a total transfer capability (TTC) determining method are given based on Static Voltage Stability Region (SVSR). Main works of this thesis are as follows:1. A precise method to determine the local boundary of SVSR is given. Fuzzy C Means (FCM) clustering method is introduced to classify the critical points according to their similarity of the normal vector. And, a cluster of critical points is used to fit the SVSR’s local boundary so as to improve its precise and efficiency.2. A new minimum load shedding algorithm and TTC Fast Calculation (F.C) algorithm after a contingency based on SVSR are derived. The proposed method can greatly improve the calculation speed and with better accuracy compared with traditional“point wise”method.Finally, all the presented methods are validated by some test systems, such as IEEE 6-bus system and New England 10-generator-39-node system.