Is the n4sid model an LTI model?

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LEI CAO
LEI CAO am 12 Apr. 2012
I have a prediction model derived by n4sid.
when I set the variables with setmpcsignals for MPC controller, it is warned "The first input argument of the "setmpcsignals" command must be a non-empty "lti" object".
Isn't an idss model LTI?
  3 Kommentare
LEI CAO
LEI CAO am 12 Apr. 2012
I guess the problem is in the matrix K.
The idss model is
x(t+Ts)=Ax(t)+Bu(t)+Ke(t)
y(t)=Cx(t)+Du(t)+e(t)
The matrix D=0, K is not zero.
When I set K=0, the alarm doen't occur any more. But the model is not good enough then.
Is there any mothod to overcome this issue?
Rajiv Singh
Rajiv Singh am 12 Okt. 2012
What matlab release are you using? Could you post some reproduction steps? As such, an estimated idss model should be usable in MPC and you should not have to set K to zero.

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