Thread Subject:

MPC toolbox- simulink

i have a nonlinear model in matlab.
i have linearized it and obtained linear model.
i have designed a controller with mpctool for linear model.
can i use this controller with the nonlinear simulink model?

thank you

can you give a demo etc. which has nonlinear simulink model
which is controlled by
linear mpc controller?

thank you

Hi Ben,

If you add MPC Controller block from the Simulink library of Model Predictive Control Toolbox to your Simulink model, and wire the inputs and outputs to the rest of the model, you can just open the block, and press "Design" button. This will linearize your Simulink model and open the GUI for designing the MPC controller. Once you are done with the design, simply run your Simulink model to test controller against your nonlinear model.

This is shown in detail here: http://www.mathworks.com/products/demos/mpc/MPC_Intro/index.html

HTH.
Arkadiy

"ben harper" <controlusc@gmail.com> wrote in message <hcuhph$rb3$1@fred.mathworks.com>...
> can you give a demo etc. which has nonlinear simulink model
> which is controlled by
> linear mpc controller?
>
> thank you

Dear Arkadiy,
I made the steps you have proposed.
But matlab gived the error "cannot trim" while trying to linearize my simulink system.

my nonlinear system is open loop unstable. but when controller is put in it becomes stable.
can the reason of the trim error could be the unstableness of my ssytem?

thank you.

> Hi Ben,
>
> If you add MPC Controller block from the Simulink library of Model Predictive Control Toolbox to your Simulink model, and wire the inputs and outputs to the rest of the model, you can just open the block, and press "Design" button. This will linearize your Simulink model and open the GUI for designing the MPC controller. Once you are done with the design, simply run your Simulink model to test controller against your nonlinear model.
>
> This is shown in detail here: http://www.mathworks.com/products/demos/mpc/MPC_Intro/index.html
>
> HTH.
> Arkadiy

i solved this problem with matlab's linmod + trim commands.
i have put input and output bloacks to the simulink model. and then linearized effectively.

"ben harper" wrote in message <he9ohn$2vv$1@fred.mathworks.com>...
> i solved this problem with matlab's linmod + trim commands.
> i have put input and output bloacks to the simulink model. and then linearized effectively.

Hello Ben, I need your help, can you explain how to add linmod + trim command to MPC design wizard.