For a Non linear Model predictive control toolbox, how can I give it a mathematical model, which is a subsystem defined in Simulink?

Question

afaq ahmad 2023-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/2037796-for-a-non-linear-model-predictive-control-toolbox-how-can-i-give-it-a-mathematical-model-which-is

回答： Emmanouil Tzorakoleftherakis 2023-10-27

I am trying to solve a non-linear model predictive control problem using the NMPC block in Simulink. However, the mathematical model of a dynamical system, which is used by MPC for prediction, is a subsystem in Simulink. Moreover, the subsystem further contains some Matlab function blocks and NARX models, as shown in the following figure.

I am attempting to design NMPC from the workspace, and the first step is to define the nlobj as follows:

nx = 1; % no of states
ny = 1; % no of outputs
nu = 2; % no of inputs
nlobj = nlmpc(nx, ny, nu);

However, I dont know how to initialise the following commands, which tell the nlobj about the mathematical model, which in my case is a subsytem in Simulink:

nlobj.Model.OutputFcn = ''; % I tried giving the name of Simulink file, but this doesn't workout
nlobj.Model.StateFcn = '';

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Answer 1

Emmanouil Tzorakoleftherakis 2023-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/2037796-for-a-non-linear-model-predictive-control-toolbox-how-can-i-give-it-a-mathematical-model-which-is#answer_1342306

Unfortunately, this is currently not supported but our development team is aware of this request. If you don't have an analytical model of the dynamics, a workaround (although more involved) would be to use a data-driven model to approximate the subsystem of interest. This example shows what this would look like.