Descriptor State space in Simulink

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Thijs 2014-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/125155-descriptor-state-space-in-simulink

回答： Fu Zhang 2019-3-27

采纳的回答： Arkadiy Turevskiy

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I have a simple Simulink model, looking like the following:

I want the sum (at the right) to be equal to zero, so I have the following equation:

Input*ss1 + Input*K*ss2 = 0
Input * (ss1 + K*ss2) = 0
ss1 + K*ss2 = 0
K = -inv(ss2)*ss1

Both ss1 and ss2 are linear state space with one input, and one input. However, when calculating K, I get a descriptor state space (a,b,c,d AND e), which I cannot (or do not know how to) enter in Simulink. When running the simulink model without the 'K.e', it does not add up to zero.

Can someone tell me how to calculate K, so I don't get the descriptor SS? Or how to use the descriptor SS in Simulink?

Regards,

Thijs

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Thijs 2014-4-11

Anyone?

Thijs 2014-4-15

Is there noone that can help me on this one?

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Arkadiy Turevskiy 2014-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/125155-descriptor-state-space-in-simulink#answer_134943

You can implement descriptor state space systems in Simulink using LTI System block from Control System Toolbox.

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Thijs 2014-4-29

That works! Thank you very much.

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Fu Zhang 2019-3-27

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https://ww2.mathworks.cn/matlabcentral/answers/125155-descriptor-state-space-in-simulink#answer_367705

In 2018b, Simulink introduced descriptor state space block, which is a built-in block that support sparse parameter. Details can be found here : https://www.mathworks.com/help/simulink/slref/descriptorstatespace.html