| 초록 |
It is well-known that control system design for the first-order delayed unstable process (FODUP) and second-order delayed unstable process (SODUP) system with negative/positive zero is difficult. If the zero is negative, it causes large overshoot, and, if the zero is positive, it shows an inverse response. The IMC filter has been modified as an overdamped for the design of the PID controller. The overdamped IMC filter can eliminate the large overshoot for the unstable process with negative zero. This overshoot is due to the large integral action and can be eliminated with decreasing the integral action. For the design of the unstable process with positive zero, the positive zero can be approximated as a dead time. The simulation studies show that the proposed design method provides better disturbance rejection and setpoint performance. The robustness study has been done based on the norm-bound uncertainty principle for the closed loop time constant λ guidelines. |
