How to reduce speed of matlab function block???

I'm doing a project on a PV system involving MPPT using simulink. I have embedded the codes of my MPPT algorithm into a Matlab function block. This block is taking voltage and current values from my PV panel and changing the duty ratio of a dc-dc buck converter accordingly. The problem is that the block is changing the duty ratio too fast. The duty ratio always goes up to 1 in microsec whereas the circuit takes much more time to response. Thus it can't track the MPP.

If there a way i can reduce the speed at which this block is functioning??? I've tried putting a "pause" function in my codes but simulink says "Function 'pause' is not supported for code generation". I need a way to make this block functions slower. Plz help. Thx.

Answer 1

[Sabin]

Change the sample time to a more suitable one. I assume the simulation is running in variable-step and that's the source of the problem.