Abstract
This paper addresses the state-variable stabilising control of the power
system using such series FACTS devices as TCPAR installed in the tie-line
connecting control areas in an interconnected power system. This
stabilising control is activated in the transient state and is
supplementary with respect to the main steady-state control designed for
power flow regulation. Stabilising control laws, proposed in this paper,
have been derived for a linear multi-machine system model using direct
Lyapunov method with the aim to maximise the rate of energy dissipation
during power swings and therefore maximisation their damping. The proposed
control strategy is executed by a multi-loop controller with frequency
deviations in all control areas used as the input signals. Validity of the
proposed state-variable control has been confirmed by modal analysis and
by computer simulation for a multi-machine test system.
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