Small-signal stability and time-domain analysis of delayed power systems

Abstract

This chapter describes the impacts that time delays in feedback control loops have on the small-signal as well as on the transient stability of power systems. We present a power system model comprising of delay differential algebraic equations (DDAEs) and describe general techniques to compute the spectrum and numerically integrate such model. The focus is on delays arising in measured signals, e.g., remote frequency measurements for power system stabilizers (PSSs) of synchronous machines (SMs). Several examples are discussed based on the IEEE 14-bus benchmark system as well as on a realistic model of the Irish transmission system.