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MATLAB Simulink Simulation problem?

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gsecer

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I want to simulate some controller and estimation algorithms for a real plant. However i get different results depending on that plant block ,which i put in simulink, is in continous form or discrete form.

When i put a continous system block, i connect zero order hold block at input and output ports of system. That is what i am thinking about what is being done for digital controller implementation. For this situation, i got bad results my algorithms does not work well.

For second design, i use a block for system which i discretize using c2d in matlab. Algorithms work perfectly for this discrete form.

So, my question is that :

For a system that i am going to use a digital controller and estimation algorithms, the best way ,to model it in simulink, is via continous time model or its discrete form which is converted using c2d

which one provides best and realistic performance?
 

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