Abstract
Voltage stability is indeed a dynamic problem. Dynamic analysis isimportant for a better understanding of voltage instability process. In this workan analysis of voltage stability from bifurcation and voltage collapse point ofview based on a center manifold voltage collapse model. A static and dynamicload models were used to explain voltage collapse. The basic equations of asimple power system and load used to demonstrate voltage collapse dynamicsand bifurcation theory. These equations are also developed in a manner, which issuitable for the Matlab-Simulink application. As a result detection of voltagecollapse before it reach the critical collapse point was obtained as original point.
Highlights
The continuing interconnections of bulk power systems, brought about by economic and environmental pressures, have led to an increasingly complex system that must operate ever closer to limits of stability. This operating environment has contributed to the growing importance of the problems associated with the dynamic stability assessment of power systems. This is due to the fact that most of the major power system breakdowns are caused by problems relating to the system dynamic responses
A model of the sample system shown in Fig.(1) and foregoing equations are used to illustrate the process of voltage collapse
Several voltage collapses are of slowly decreasing voltage nature followed by an accelerating collapse in voltage
Summary
The continuing interconnections of bulk power systems, brought about by economic and environmental pressures, have led to an increasingly complex system that must operate ever closer to limits of stability. This operating environment has contributed to the growing importance of the problems associated with the dynamic stability assessment of power systems. One type of system instability, which occurs when the system is heavily loaded, is voltage collapse This event is characterized by a slow variation in the system operating point, due to increase in loads, in such a way that voltage magnitudes gradually decrease until a sharp, accelerated change occurs
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