Performance improvement of PI controllers through dynamic set-point weighting
✍ Scribed by Rajani K. Mudi; Chanchal Dey
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 701 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0019-0578
No coin nor oath required. For personal study only.
✦ Synopsis
set-point weighting a b s t r a c t Responses of high-order systems under Ziegler-Nichols tuned PI controllers (ZNPIs) are characterized by excessive oscillation with a large overshoot. Although, a fixed set-point weighting based PI controller (FSWPI) may decrease the overshoot considerably, it fails to reduce the oscillation in the set-point response. Moreover, both FSWPI and ZNPI exhibit equally poor load regulation. Keeping in mind an overall improved performance, we propose an online dynamic set-point weighting technique for ZNPIs. The dynamic set-point weighting factor (β d ) is heuristically derived from the instantaneous process trend. Performance of the proposed dynamic set-point weighting based PI controller (DSWPI) for various secondand third-order processes including a pH process shows a significant improvement during both the setpoint and load disturbance responses over other methods. Stability and robustness of the proposed DSWPI are addressed. Effectiveness of the DSWPI is demonstrated through the real-time implementation on a practical DC position control system.