Observer-PID stabilization strategy for unstable first-order linear systems with large time delay

J.F. Márquez-Rubio, B. Del-Muro-Cuéllar, M. Velasco-Villa, D.F. Novella-Rodríguez

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11 Citas (Scopus)

Resumen

This work considers the stabilization and control of a class of unstable first-order linear systems subject to a relatively large input-output time delay. As a first step, a particular observer scheme is proposed in order to predict a specific internal signal in the process. Conditions to ensure the adequate prediction convergence of the signals are formally stated. In a second step, the internal predicted signal is used to implement classical P, PI, and PID controllers providing stability conditions for the resulting closed-loop system. The proposed control strategy allows one to address time delays as large as four times the unstable time constant of the open-loop system, in contrast with the reported related literature where the maximal bound has been stated until now as two times the unstable time constant of the open-loop system. The proposed observer-based control structure considers also the tracking of step reference signals and the rejection of input step disturbances.

Idioma originalEnglish
Páginas (desde-hasta)8477-8487
Número de páginas11
PublicaciónIndustrial and Engineering Chemistry Research
Volumen51
N.º25
DOI
EstadoPublished - 27 jun 2012
Publicado de forma externa

All Science Journal Classification (ASJC) codes

  • Química (todo)
  • Ingeniería química (todo)
  • Ingeniería industrial y de fabricación

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