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Small-signal Stability Analysis of Power Systems with Inclusion of Periodic Time-Varying Delays

The impact of time delays of wide-area measurement systems on the transient behaviour of power systems are not negligible. These delays are usually time-varying and, more precisely, periodic. This paper defines a systematic numerical approach to estimate the small-signal stability analysis of power systems with inclusion of periodic time-varying delays. The paper provides the mathematical background of the proposed approach and discusses the numerical implementation of three types of periodic delays, namely, sinusoidal, sawtooth and square-wave. The case study is based on the IEEE 14-bus system with a power system stabilizer, whose input signal is assumed to be obtained through a wide-area measurements system. The estimated eigenvalues of the various types of delays are compared with time-domain simulations.

Author(s):

Muyang Liu    
University College Dublin
Ireland

Federico Milano    
University College Dublin
Ireland

 

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