can anybody help me in simulink? (fractional order PID)

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af af
af af on 23 Aug 2021
I removed the following article its robust controller and used a fractional-order PID instead.
But there is a problem in the simulation that one of the control signals (u_3) becomes negative (figure below).
Can you help solve this problem?
The simulation program in MATLAB is come attach.
(article name: Control of malaria outbreak using a nonlinear robust strategy with adaptive gains)
The simulation uses the FOMCON Toolbox for MATLAB.

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