Abstract
In this paper, a simple and effective PI controller tuning method is presented. To take both performance requirements and robustness issues into consideration, the design technique is based on optimization of load disturbance rejection with a constraint either on the gain margin or phase margin. In addition, a simplified form of the resulting tuning formulae is obtained for first order plus dead time models. To demonstrate the ability of the proposed tuning technique in dealing with a wide range of plants, simulation results for several examples, including integrating, non-minimum phase and long dead time models, are provided.
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Abbreviations
- \(A_{m}\) :
-
Desired gain margin
- d :
-
Load disturbance signal
- FOPDT:
-
First order plus dead time
- GM:
-
Gain margin
- \(G_{c}(s)\) :
-
Controller transfer function
- \(G_{p}(s)\) :
-
Plant transfer function
- IAE:
-
Integral of absolute error
- IE:
-
Integral of error
- \(K_{c}\) :
-
Proportional gain
- \(K_{i}\) :
-
Integral gain
- \(K_{p}\) :
-
Gain of FOPDT model
- L(s):
-
Loop transfer function
- PID:
-
Proportional–integral–derivative
- PM:
-
Phase margin
- \(\phi _m\) :
-
Desired phase margin
- r :
-
Reference signal
- SGM:
-
Specified gain margin
- SPM:
-
Specified phase margin
- T :
-
Time constant of FOPDT model
- \(T_{i}\) :
-
Integral time
- \(\tau _d\) :
-
Time delay of FOPDT model
- \(\omega \) :
-
Frequency
- y :
-
Output signal
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Tavakoli, S., Sadeghi, J., Griffin, I. et al. PI controller tuning for load disturbance rejection using constrained optimization. Int. J. Dynam. Control 6, 188–199 (2018). https://doi.org/10.1007/s40435-016-0290-6
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DOI: https://doi.org/10.1007/s40435-016-0290-6