| 1. |
- Hast, Martin, et al.
(author)
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Design of Optimal Low-Order Feedforward Controllers
- 2012
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In: 2nd IFAC Conference on Advances in PID Control 2012. - 9781627483247 ; , s. 483-488
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Conference paper (peer-reviewed)abstract
- Design rules for optimal feedforward controllers with lead-lag structure in the presence of measurable disturbances are presented. The design rules are based on stable first-order models with time delays, FOTD, and are optimal in the sense of minimizing the integrated-squared error. The rules are derived for an open-loop setting, considering a step disturbance. This paper also discusses a general feedforward structure, which enables decoupling in the design of feedback and feedforward controllers, and justifies the open-loop setting.
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| 2. |
- Larsson, Per-Ola, et al.
(author)
-
Comparison Between Robust PID and Predictive PI Controllers with Constrained Control Signal Noise Sensitivity
- 2012
-
In: 2nd IFAC Conference on Advances in PID Control 2012. - 9781627483247 ; , s. 175-180
-
Conference paper (peer-reviewed)abstract
- A performance comparison between PID and predictive PI (PPI) controllers, i.e., two different prediction methods, is presented. Optimization of controller and measurement filter parameters, considering load disturbance rejection, robustness and noise sensitivity, is performed for a batch of industrially representative processes. For a majority of the processes and the constraints chosen, results show that the performances of the controllers are similar. However, the PID controller yields better performance for processes where increased phase and gain may be achieved over a wider frequency interval than what is possible by the PPI controller.
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