1. Types of large fluctuations related to power system stability include:
a) Instability is the case when there is no damped oscillations between elements of the power system led to the disintegration system electricity in a few seconds;
b) Loss of static stability is the case with small oscillation damping due to the electrical system began operating near the limit instability;
c) Loss of voltage stability is declining case voltage down to the voltage regulator device can not raise the voltage to a value allowed. In this case, the reactive power losses increase and lead to widespread breakdown voltage in the power system;
d) Instability caused by prolonged low frequency oscillations (resonance low frequency) at low frequency more industrial frequency.
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