The paper studies the impact of realistic WideArea
Measurement System (WAMS) time-varying delays on the
dynamic behaviour of power systems. A detailed model of
WAMS delays including pseudo-periodic, stochastic and constant
components is presented. Then, the paper discusses numerical
methods to evaluate the small-signal stability as well as the timedomain
simulation of power systems with inclusion of such delays.
The small-signal stability analysis is shown to be able to capture
the dominant modes through the combination of a characteristic
matrix approximation and a Newton correction technique. A case
study based on the IEEE 14-bus system compares the accuracy of
the small-signal stability analysis with Monte-Carlo time-domain
simulations. Finally, the numerical efficiency of the proposed
technique is tested through a real-world dynamic model of the
all-island Irish system.
