Mid-range voltage dynamics in electrical power systems

When large input and/or structural changes occur on an electric power system it becomes hard to separate electromagnetic phenomena (reflected in significant voltage changes) from the electromechanical phenomena (typically reflected in loss of synchronism). The dynamics evolving under most general conditions are reflected in large electromechanical as well as electromagnetic changes. It is shown that under certain conditions the two types of phenomena can be studied separately. Rigorous indices are introduced for separating them when possible. Under the same conditions it is possible to distinguish dynamical (stability) from steady-state (viability) problems