Study Of The Algorithm Of Auto-Tuning PDF Control Based On Relay Feedback

For its characters of high robustness, high disturbance rejection, no overshoot and fast response, the PDF (Pseudo Derivative Feedback) control algorithm has wide prospect in practical application.By means of relay feedback, the dimensional analysis and root configurations, a new auto-tuning control algorithm called auto-tuning PDF control based on relay feedback is presented in this thesis on base of auto-tuning PID control and PDF control with fixed preset coefficients. This algorithm combines relay feedback, the dimensional analysis and root configurations. The formulas for control coefficients online tuning and the criterion ratio for identification of plant order are introduced. This auto-tuning operates in the closed loop manner, so it is not sensitive to any disturbance. The recommended algorithm can also be employed as some kind of pre-tuning controller for high performance control system at the starting point in their complicated auto-tuning process. Online tuning and relatively light calculation burden due to directly coefficient setting by formula extend this scheme to be used for fast-running process and mechanical equipment, numerical simulation over a wide range of system parameter variation shows that the recommended scheme is superior to both traditional PDF designed by Phelan's approach and relay feedback auto-tuning PID in terms of performance behavior. In addition, a PDF control toolbox on MATLAB/Simulink platform has been developed in this work, providing users a modularized and integrated design.