The electromechanical wave propagation in power
systems was emphasized and investigated through mathematical
models and practical observations. To mitigate this propagation,
the conventional power system stabilizer was introduced before.
The strategy adopted in this paper is to exploit the phenomena of
disturbance propagation and reflection to provide an extra damping
torque via the PSS. To counteract the propagated disturbances, auxiliary signals of the speed deviation of the first disturbed machines
are sent to the PSS of the consecutive directly connected machines.
To enhance the overall damping, the reflected disturbances are
considered as new propagated disturbances in the reverse direction
and are counteracted as the propagated disturbances. In brief, the
neighboring machines speed deviation signals are used as extra
inputs to the PSS of each machine. The simplified model of the
Western North American power grid and an academic power system
model are simulated to illustrate the effectiveness of the proposed
strategy to mitigate electromechanical wave propagation and the
associated oscillations. |
