Time-domain approach examines the behaviour of the system, one determines whether stability has been main- tained or lost. In contrast to the time-domain approach, direct methods determine system stability based on energy functions. The basis of direct methods for the stability assessment of a system is knowledge of the sta- bility region. During the last decade, many researches have thoroughly ana,ysed the use of energy functions for the direct stability assessment of networks. Energy function analysis offers a different geometric view of voltage collapse.
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