purpose of state-space with pid

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azan 2012-10-11

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Hi everyone! I am having problem that when I connect state space block to PID and take its output as feedback in simulink I get a plot that converges at reference value; now I have to do the same job in mfile I have done the coding for pid but I am not getting idea that; what is the purpose of state space connected with pid so that I can write code for it.

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Azzi Abdelmalek 2012-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/50464-purpose-of-state-space-with-pid#answer_61591

编辑：Azzi Abdelmalek 2012-10-11

在 MATLAB Online 中打开

clear,close
%your model and its input output
mot=tf(1,[1  1]),
model=ss(mot);
[F,h,c,d]=ssdata(model);
model.u='u'
model.y='y'
%your pid controller
r=pid(5,1/0.05,10)
r.u='e'
r.y='u'
%adding a reference r with som2=r-y
som1 = sumblk('e = r - y');
%global model with all conneection
modelg=connect(som1,r,model,'r','y')
%simulation
step(modelg)