I saw many matlab simulink examples in the link
but dont know how to open it,please tell how to open the simulink examples
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Note - My answer is with refernce to R2011b
You should find all these examples here (execute in matlab):
>> winopen([matlabroot '\toolbox\physmod\powersys\powerdemo\'])
If you open the doc which comes with MATLAB then you can see the name of the model and a link you can click to open the model as well.