The paper deals with the problem of avoiding overshoot in the closed loop response of a chemical process to a step input. Significant results relating the step response overshoot to poles and zeros of the open loop function are reviewed. From a general theorem relating the position of zeros and poles to the occurrence of extrema points in the step response, a direct method for the design of PID controllers, able to avoid overshoot in the closed loop response, is derived. Examples of application are reported for low order processes, for which analytical values of the controller parameters can be easily derived. Simulation results illustrate the potential of the design technique.
Control of Overshoot in the Step Response of Chemical Processes
SCALI, CLAUDIO
1999-01-01
Abstract
The paper deals with the problem of avoiding overshoot in the closed loop response of a chemical process to a step input. Significant results relating the step response overshoot to poles and zeros of the open loop function are reviewed. From a general theorem relating the position of zeros and poles to the occurrence of extrema points in the step response, a direct method for the design of PID controllers, able to avoid overshoot in the closed loop response, is derived. Examples of application are reported for low order processes, for which analytical values of the controller parameters can be easily derived. Simulation results illustrate the potential of the design technique.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
