Abstract
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This paper proposes a decentralized adaptive emergency
control scheme against power system voltage instability.
Decentralized control architecture is proposed by segregating the
system into several local areas or zones based on the concept of
electrical distance. Intelligent agents are assigned in each area to
monitor the bus voltages and generator reactive powers to detect
any threat of voltage collapse and to actuate countermeasures.
A novel performance index has been formulated based on the
load voltage and generator reactive power violations to identify
the severity of disturbance and the risk of system emergency in
each area. The coordination of the timing of the countermeasures
among the agents is achieved through the formulation of the
integral of the performance index. The simplicity and the adaptive
nature of the proposed control scheme to provide countermeasures
against any disturbance make it useful for real-time application.
The robustness of the proposed approach has been validated
through several case studies using the New England 39-bus test
system and a more realistic Nordic32 test system.