An Improved Dynamic Set Point Weighted PI Controller for Servo Position Control Application

Dynamic set point weighting technique is a well established technique reported in leading literature [10, 11]. Here, in this paper a simpler and better design is proposed in dynamic set point weighting technique for performance enhancement. In this proposed scheme the weighting factor is obtained online based on the instantaneous change of error of the process variable. The value of weighting factor is computed through a simple mathematical function depending on the process operating conditions. Performance of the proposed improved dynamic set point weighted PI controller is tested on DC servo position control systems through simulation study as well as real time implementation. Superiority of the proposed technique is demonstrated through performance analysis with the widely reported conventional fixed set point weighting and dynamic set point weighting schemes. Considerable robustness is also observed against model uncertainty with increased dead time and is found to perform satisfactorily in presence of measurement noise.