MPCmove with function and pscad

Question

영민 공 2023-7-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999293-mpcmove-with-function-and-pscad

回答： Shushant 2023-8-1

I want mpc with pscad, so i want make mpcmove function

function [u,y] = mpcmove_test(r,y)
num=[1 1];
den=[1 1 2];
[A,B,C,D] = tf2ss(num,den);
sys = ss(A,B,C,D);
Ts = 0.05;
p = 10;
m = 10;
% r = 1;
% y = 0;
mpc_contrller = mpc(sys,Ts,p,m);
state = mpcstate(mpc_contrller);
% for i = 1:100
[u] = mpcmove(mpc_contrller,state,y,r);
y = C*state.plant;
% y_p(i,1) = y;
% end
% plot(y_p)

this is my function code, but when i run this fuction with pscad, It can't follow the reference. This means that the value will continue to rise and never stop. I think pscad run this function.

But when i run this code with loop, It works well, why first code works different?

num=[1 1];
den=[1 1 2];
[A,B,C,D] = tf2ss(num,den);
sys = ss(A,B,C,D);
Ts = 0.05;
p = 10;
m = 10;
r = 1;
y = 0;
mpc_contrller = mpc(sys,Ts,p,m);
state = mpcstate(mpc_contrller);
for i = 1:100
[u] = mpcmove(mpc_contrller,state,y,r);
y = C*state.plant;
y_p(i,1) = y;
end
plot(y_p)

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Answer 1

Shushant 2023-8-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999293-mpcmove-with-function-and-pscad#answer_1281567

Hi @영민 공,

I understand that when you try to execute two identical pieces of code, one using a regular loop and the other utilizing a function and using “pscad” but there is disparity in outputs. The difference in outputs is due to the function "mpcmove".

Kindly refer to the following thread to get a better understanding of the issue and possible workaround.

Why mpc function and mpc loop isn't same? - MATLAB Answers - MATLAB Central (mathworks.com)

Thank you,

Shushant