Frequency domain interpretation of the Smith pbkp_redictor

Abstract:

Dealing with the control design problem for a given system, the presence of pure time-delays in the plant imposes interesting challenges from the control point of view. In fact, different techniques can be applied among them the well-known Smith pbkp_redictor. In this paper, the use of the Smith pbkp_redictor is analyzed and approximated in the frequency domain by means of a Taylor expansion. Additionally, this approximation can be interpreted as the introduction of a pbkp_rediction in the loop to modify the Nyquist plot, such that stability margins are improved. As an alternative, a notch filter to reduce the gain at the crossover frequency is also considered. A control design example for an unstable time-delayed plant illustrates this approach. Some advantages and drawbacks of this control design approach are also outlined.

Año de publicación:

2018

Keywords:

Fuente:

scopus