In this paper, a multiagent-based voltage and reactive
power control in the case of a multiple contingency is presented.
Incorporating the agent-based autonomous feature to the intelligence
of the remote terminal units, the present power system
control structure can be used to help in preventing system voltage
collapse during catastrophic disturbances. The control algorithm
is based on a decentralized architecture of intelligent agents and
the determination of a local zone that can carry out quick countermeasures
in a decentralized manner as a multiagent system
(MAS) during an emergency situation. An adaptive determination
of the local zones undergoing voltage collapse has been developed
based on the electrical distances among the generators and loads.
Once assigned, the elements of the Jacobian matrix can be used
to determine the optimum actions that need to be carried out at
each power system element (such as increasing the voltages of
generators and load shedding) within the assigned local zone. The
contract net protocol is used for agent interactions. Simulation
results using the IEEE-57 bus system show that the proposed
method can act quickly to respond to emergency conditions to
ensure that voltage collapse can be avoided.