Researches On Static Voltage Stability In Power System Based On PSS/E

During recent years the study on voltage stability has received significant attention because voltage instability and voltage collapse appear frequently. At the same time, great progress has been made on voltage stability, especially static voltage stability. This dissertation, concentrating on the static voltage stability and emphasizing on the work to acquire the static stability limit, has made some progress in application.It is an important job to determine the voltage stability limit for the static voltage stability research. At present, there are many algorithms for computing the voltage stability limit, but the existed problem in them is the high computation burden. It is necessary to improve the algorithm. Admittance model in load bus is introduced in this dissertation in detail. The difficulties connected with the singular load flow Jacobian matrix are overcame in this algorithm. Moreover, this algorithm is simpler for application, faster in calculation and clearer on physical conception than other algorithms.Power system analysis and computation technology entered a new era with the help of the comprehensive power system simulation packages (such as PSS/E, BPA and NETOMAC). But voltage stability analysis is not always included in these soft packages. Chapter 2 of this dissertation demonstrates basic procedures of power system simulation and analysis by using PSS/E. PSS/E supply a language-IPLAN, which can make it possible to realize the computation of voltage stability limit. A method, which is for computing the voltage stability limit based on PSS/E, is presented in this dissertation. This method, adopting admittance model in load bus and using the activities supplied by PSS/E, can compute the voltage stability limit effectively. This method takes into account some factors related to voltage stability such as the generation active power and reactive power limitation, generation active power redistribution and OLTC action. The effectiveness of this method is examined and proved in IEEE 5 and IEEE 30 nodes network. The computation case also demonstratesthe method presented in this paper is robust, stable, simple and practical in use.