An Engineering Control Method of SCR Denitration System

The SCR denitration system has dead-time and nonlinearity, so a Fractional-order PI
^λ
D
^μ
control method is proposed. The second-order linear active disturbance rejection control(LADRC) can be seen as a structure of a conventional PID and a second-order filter connected in series. However, the tuning ability of conventional PID is limited. Using fractional order PI
^λ
D
^μ
and second-order filters are connected in series to improve ordinary cascade PID control, and the control system parameters are tunned using an improved Imperial Competition algorithm. The simulation results show that the fractional order PI
^λ
D
^μ
and second-order filter in series can better reproduce the advantages of active disturbance rejection control (ADRC), and the control performance is better than ordinary cascade PID and the structure of conventional PID and second-order filter in series. The fractional order PI
^λ
D
^μ
control system has a simple structure and easy tuning, which is worth promoting in engineering applications.