Voltage Stability

  • Sandro CorsiEmail author
Part of the Advances in Industrial Control book series (AIC)


Distinguishing voltage stability from the classic power system angle stability problem, as it is generally understood and classified, is the chapter starting point. Evidence is also given to the significant contribution of power system voltage control loops (AVR and SVR) to electromechanical oscillation stability, to counteract the tendency to associate voltage control with voltage stability alone. These preliminary clarifications help us differentiate the voltage instability phenomenon as substantially linked to maximum line loadability while increasing the load. The classic voltage-power (V-P) curves of the Thevenin equivalent circuit are introduced as the main evidence in support of the voltage instability process. The nose tip of such a curve gives the correct information on maximum loadability when a power system’s detailed dynamic model of a considered large or equivalent scheme is used. The dependence of the nose shape on the on-load tap changer (OLTC) and the over-excitation limit (OEL) dynamics, and the load characteristics and differences with or without SVR are clearly evidenced. The fact that voltage instability appears to be strongly influenced by power system dynamics is widely demonstrated with comparisons of different operating conditions of the power system control loops. System voltage collapse as the terminal event of an instability process’s deterioration leading to blackout is described as an irreversible process. Examples of large power system voltage instability followed by voltage collapse are provided. A brief mention of the voltage instability Hopf–saddle-node bifurcation method is also made.


Power System Equilibrium Point Voltage Stability Voltage Instability Voltage Collapse 
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Copyright information

© Springer-Verlag London 2015

Authors and Affiliations

  1. 1.ConsultantCastellanzaItaly

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