1. Enhanced performance with pid controllers and lead/lag compensators for unstable processes with time delays
Authors : J Udaya Sekhar, Dr. B Sarath Babu
Pages : 21-32
DOI : http://dx.doi.org/10.21172/1.163.04
Keywords : unstable process, time delay, direct synthesis method, sensitivity function Abstract :Using the direct synthesis method, a proportional-integral-derivative (PID) controller in series with a lead- lag filter is designed for control of the open-loop unstable processes with time delay. Different types of approximations (Taylor's 1st and 2nd order, Pade’s 1st, 2nd and ½ orders) for the time delay term are considered and obtained different controller structures of PID. A comparative study of the performance of the designed controllers has been carried out on various unstable processes. Set-point weighting is considered to reduce the overshoot. The proposed scheme consists of only one tuning parameter, and systematic guidelines are provided for selection of the tuning parameter based on the peak value of the sensitivity function. Robustness analysis has been carried out based on sensitivity and complementary sensitivity functions. Nominal and robust control performances are achieved with the proposed method and improved closed loop performances are obtained when compared to the recently reported methods in the literature.
Citing this Journal Article :J Udaya Sekhar, Dr. B Sarath Babu, "Enhanced performance with pid controllers and lead/lag compensators for unstable processes with time delays", Volume 16 Issue 3 - May 2020, 21-32
Click here to Submit Copyright Takedown Notice for this article.