Error in using Adaptive MPC block

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paolo dini 2021-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/760536-error-in-using-adaptive-mpc-block

评论： zaidan zyadat 2021-10-3

Hi everyone,

i am using the adaptive MPC block to control a Park Model of Brushless motor.

With classic MPC block i have no problem but when i use adaptive one there is some problem from size signals matching oint of view that i am not able to solve, which generates this error in Simulink:

Error in port widths or dimensions. The signal connected to the "Model.DX" port of the "Park_Model_FOC_Adaptive_MPC/Adaptive MPC Controller" block must be a matrix signal of 4 rows and 1 columns.

Error in port widths or dimensions. Output port 1 of 'Park_Model_FOC_Adaptive_MPC/Adaptive MPC Controller/MPC/MPC Matrix Signal Check DX/Input' is a one dimensional vector with 4 elements.

I share the files i have used to simulate the control loop.

Basically i exploits the mpc object from classic mpc and use it in adaptive one after convert its internal plant in dicrete time one.

To reproduce the mpc variable launch the "Park_Model_FOC_Linear_MPC" and in the command writes the follows line:

ct_plant = mpc1.Model.Plant;

dt_plant = c2d(ct_plant,0.001);

mpc1.Model.Plant = dt_plant;

then launch the "Park_Model_FOC_Adaptive_MPC" and so you can analyse my simulink model and see the errors.

I do not understand why the sizes does not match...

Thanks to who can respond.

Pierpaolo.

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Felix Schönig 2021-7-14

@dekun wang You are a hero! Thanks so much! It is very stupid that they have hardcoded this into their template/example with the CSTR model. No idea why ... anyways, you are right!

zaidan zyadat 2021-10-3

Dear Pierpaolo ,

To solve the problem of widths based on my practical experience , you should go to matlab function and under edit data you will find A,B,....,DX so to speak , you can select the proper size for the matrix ,A(3,3) ,...., DX(3,1) and then you have go to mpc controller and open it from the arrow at the left-lower corner ,you will find blocks of ther you can add signal specifucation block and select the proper size compatible with the sizes you already selected in the matlab function .

hope this helps

Note : if you are phD student or working in industries I can help more if you need .

have a good luck

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