A decentralized multiagent-based voltage control for catastrophic disturbances in a power system

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.