Disturbance observer‐based dynamic optimal setting control

Disturbance observer–based dynamic optimal setting control scheme for processes with nonlinear loops

“…then, with the PID control law (8), the composite closed-loop system (11) is asymptotically stable and K P can be calculated…”

“…then with predesigned controller (8), the performance deterioration due to harmonic disturbance (5) can be minimized by reselecting the set points as the output of the following singular dynamic system:…”

“…Applying the approach in Theorem 2 to (28), it can be obtained that K I = In the ideal situation, the controller is designed as in (8) and the control inputs for each loop is displayed in Figure 3. Under the control law (8), the control outputs converge to set points as in Figure 4. The tracking errors are asymptotically stable as demonstrated in Figure 5.…”

“…As illustrated in Figure , the upper layer optimizes the performance index to get desired set points for those closed‐loop variables, whereas the lower layer aims at achieving required loop control along the production line. After the upper layer is determined, the operation and sustainability will depend on the controlled variables that are closely related to the performance of the concerned industrial process …”

“…After the upper layer is determined, the operation and sustainability will depend on the controlled variables that are closely related to the performance of the concerned industrial process. [2][3][4][5][6][7][8][9] In many industrial processes, the controller structure on the lower layer is hard to change since the production line was installed. Besides, the controller parameter adjustment has limited power to realize plant wide operation optimization.…”