Autors: Stoitseva-Delicheva, D. R., Yordanova, S. T.
Title: Investigation on Robustness of Model-Based Fuzzy Logic Control Systems
Keywords: level fuzzy logic control, parallel distributed compensation, robust performance, robust stability, simulations, Takagi–Sugeno–Kang plant model

Abstract: novel engineering approach for assessing the robustness of fuzzy logic control (FLC) systems with modified parallel distributed compensation (MPDC) is presented. It addresses the problem of successful implementation and operation in industrial environment of designed systems for the control of complex plants with model uncertainty. The research steps on modified Takagi–Sugeno–Kang (MTSK) plant models MTSKn and MTSKlow already derived and validated for normal and low plant loads from experimental data for the level of the solution in an industrial carbonisation column for soda ash production. MPDC with PI linear local controllers are developed based on the MTSKn plant model, which differ in the parameters that are optimised by genetic algorithms for fitness functions with and without robustness requirements and different random initial parameter values. The MTSKn and each of the designed MPDC are represented according to suggested criteria by a nominal and varied linear plant model and controller, respectively. Then, robust stability and robust performance criteria are derived for the linearised MPDC–MTSKn systems. The system performance and robustness are investigated in the frequency domain and from the simulated reference step responses for MTSKn and MTSKlow, with the results benchmarked against an existing adaptive FLC.

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Issue

Applied Sciences (Switzerland), vol. 16, 2026, Switzerland, https://doi.org/10.3390/app16041805

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