Abstract:

Conventional PI control encounters some problems when dealing with large lag process in the presence of parameter uncertainties. For the typical first-order process, an observerbased linear active disturbance rejection control (LADRC) scheme is presented to cope with the difficulties, and a reduced-order observer scheme is proposed further. Some quantitative dynamic results with regard to non-overshoot characteristics are obtained. Finally, the performance boundaries of LADRC and PI control are explicitly compared with each other, which shows that the former is more superior in most cases.