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Simulink MPC Designer ZOH FOH Error

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Henry Provan
Henry Provan on 5 Mar 2016
Answered: dekun wang on 18 May 2021
I am trying to design an MPC controller using the simulink controller toolbox. Whenever I try to make the MPC sample time less that 1, I get the following error: "The "zoh" and "foh" methods cannot be used for discrete models with poles near z=0" Could someone please explain what the error means and how I fit my controller? Thanks
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Jordan Olson
Jordan Olson on 1 Jul 2020
I'm also having this issue, but changing the sample time in the MPC doesn't fix it.

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Answers (1)

dekun wang
dekun wang on 18 May 2021
poles in discrete domain near z=0 means poles in continuous domain tending to -infinite which means your system's natural frequency is infinitely large. It cannot be true for any systems. So my suggestion would be to double check your plant model.

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