Levy guided Firefly Algorithm based tuning of decentralised PI Controller of Nonlinear Multivariable system - Coal Gasifier

2014 ◽  
Vol 47 (1) ◽  
pp. 127-134 ◽  
Author(s):  
R. Kotteeswaran ◽  
L. Sivakumar
2018 ◽  
Vol 15 (3) ◽  
pp. 845-853 ◽  
Author(s):  
E. A. Mohamed Ali ◽  
A. Abudhahir ◽  
A. Manivanna Boopathi

2020 ◽  
Vol 39 (3) ◽  
pp. 4319-4329
Author(s):  
Haibo Zhou ◽  
Chaolong Zhang ◽  
Shuaixia Tan ◽  
Yu Dai ◽  
Ji’an Duan ◽  
...  

The fuzzy operator is one of the most important elements affecting the control performance of interval type-2 (IT2) fuzzy proportional-integral (PI) controllers. At present, the most popular fuzzy operators are product fuzzy operator and min() operator. However, the influence of these two different types of fuzzy operators on the IT2 fuzzy PI controllers is not clear. In this research, by studying the derived analytical structure of an IT2 fuzzy PI controller using typical configurations, it is proved mathematically that the variable gains, i.e., proportional and integral gains of typical IT2 fuzzy PI controllers using the min() operator are smaller than those using the product operator. Moreover, the study highlights that unlike the controllers based on the product operator, the controllers based on the min() operator have a simple analytical structure but provide more control laws. Real-time control experiments on a linear motor validate the theoretical results.


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