Is the n4sid model an LTI model?

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LEI CAO 2012-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/35237-is-the-n4sid-model-an-lti-model

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?

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LEI CAO 2012-4-12

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 2012-10-12

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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