How get state-space model from simulink model

Hello.

How can I get a state space model from simulink power_PSS model? power_PSS is a Kundur two area model. I tried to use linmod() and linmod2() but get error message

??? Error using ==> fileparts at 17 Input must be a row vector of characters.

Error in ==> load_system at 19 [path, sys, ext] = fileparts(sys); %#ok<NASGU>

Error in ==> getLinNormalModeBlocks at 22 load_system(mdl);

Error in ==> dlinmod at 107 [normalblks,normalrefs] = getLinNormalModeBlocks(model);

Error in ==> linmod at 60 [varargout{1:max(1,nargout)}] = dlinmod(model, Ts, varargin{:}, Args);

Thank you!

[Kaustubha Govind]

What is the exact command that you are using? It seems like there could be some special characters in the file name you are providing to LINMOD.

[Aleksey]

It was stupid mistake. I forgot to use ', because I used the model name, but not the path to it. Thank you.

Answer 1

[Fangjun Jiang]

>> linmod('power_PSS')

SimPowerSystems processing circuit #1 of power_PSS ...
Computing state-space representation of linear electrical circuit ...
 (68 states ; 35 inputs ; 47 outputs ; 9 switches)
Computing steady-state values of currents and voltages ...
Building the Simulink model inside "powergui" block ...
Ready.
ans = 
             a: [252x252 double]
             b: [252x0 double]
             c: [0x252 double]
             d: []
     StateName: {252x1 cell}
    OutputName: {0x1 cell}
     InputName: {0x1 cell}
     OperPoint: [1x1 struct]
            Ts: 0

[Aleksey]

Thank you very much for your help. It was my fault, I forgot write '

[rishi sharma]

Hi Thanks for posting this discussion- Does linmod('power_PSS') give input and output matrices?

in my trials they came in as null. Is there a way around for this problem with linmod or some other method needs to be tried

thanks for the help.

[SinanB]

the output matrix 'D' is usually a null one!