Abstract
Due to its simplicity, Proportional-Integral (PI) controller still remains as the widely used controller for motor speed control system. However, PI controller exhibits windup phenomenon when the motor operates in a saturated state, which may cause degradation to the control system. In order to overcome the windup phenomenon, many researches have introduced various types of anti-windup methods such as the Conditioning Technique (CI), Tracking Back Calculation (TBC), Integral State Prediction (ISP), Steady-state Integral Proportional Integral Controller-01 (SIPIC01) and Steady-state Integral Proportional Integral Controller-02 (SIPIC02). These are anti-windup techniques with integral control switching mechanism, coupling of proportional gain, kp, and integral gain, ki. Due to the coupled kp and ki, tuning motor performance is a difficult task with short settling time without experiencing overshoot. SIPIC01 and SIPIC02 are robust anti-windup methods without a switching mechanism and exhibit decoupling feature. SIPIC01 and SIPIC02 have shown better dynamic performance compared to CI, TBC and ISP. However, SIPIC01 has not been compared to SIPIC02 in terms of their decoupling effect flexibility and dynamic performance. The decoupling effect was verified using MATLAB simulation, while the performance analysis was verified through hardware simulation and testing by using Scilab. The results obtained from the simulation showed that both SIPIC01 and SIPIC02 consist of decoupling features that allow a performance with coexistence of zero or minimum overshoot with short settling time. However, SIPIC02 consists of longer rise and settling time as compared to SIPIC01. Therefore, it can be concluded that SIPIC01 is better than SIPIC02 in term of dynamic performance.
Highlights
A control system is one of the important components in a system which is responsible in producing desired output
It can be said that both state Integral Proportional Integral Controller-01 (SIPIC01) and state Integral Proportional Integral Controller-02 (SIPIC02) consist of decoupling features that allows a performance with coexistence of zero overshoot and short settling time
It can be said that SIPIC01 is better in dynamic performance as compared to SIPIC02
Summary
A control system is one of the important components in a system which is responsible in producing desired output. PI controller experiences windup which normally happens when the output of the controller exceed the input limit of the plant which caused the system to operates in a saturated state [5] This phenomenon will lead to poor control response such as increased overshoot, long settling time and system instability. There are many anti-windup techniques developed to avoid windup phenomenon such as the Conditional Integration (CI), Tracking Back Calculation (TBC), Integral State Prediction (ISP), Steady-state Integral Pi Controller-01 (SIPIC01) and Steadystate Integral Pi Controller-02 (SIPIC02) [5] Both SIPIC01 and SIPIC02 have been compared with the existing anti-windup PI controllers and the result shows that both of them perform better in term of dynamic performance on motor speed control [6]. This work serves to expand the knowledge of the field of anti-windup PI controller
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