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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.
Conventional PI control encounters some problems when dealing with large lag processes 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. Quantitative dynamic results with regard to non-overshoot characteristics are obtained. Finaally, 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.