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Partial shading system has a derivate state error

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Tony Castillo
Tony Castillo on 7 Sep 2018
Hi Ms, I started to test a partial shading model (an example belonging to Matworks https://es.mathworks.com/help/physmod/sps/examples/partial-shading-of-a-pv-module.html), but when I included to the model the Buck converter it crashed out and give me back an error message related to the follows:
An error occurred while running the simulation and the simulation was terminated
Caused by:
Derivative of state '1' in block 'power_PVArray_PartialShading2/PV cells 65-96/Diode Rsh/BAL/Transfer Fcn' at time 0.0 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)
By recommendations of a support technician, I had testing some insights about how to roundabout or avoid this issue produced in my experimentation with a MATLAB example, these were the steps recommended to me in order to overcome the problem:
"... you can try the steps listed below.
1-Open the model and do all the initialization procedures. 2-Change the solver type to fixed step and run the model(Simulation will fail). 3-Again change the solver type to variable-step and run the model."
Unfortunately, afterwards I had noticed that works ONLY when I keep the POWERGUI to "Fixed", whether you change it to "continous" I will have the same error and the simulation won't run.
Another thing that for me is quite strange it is the behavior of the system when I added to it a Power Converter (buck) as it in the model, I can observe it is with a fixed "duty cycle", and just adding this to the model appears all the issues in there. Because if you take it off yo will be able to observe the I and V measured by the scope 1, but if you include it again you won't have any signals. Could anyone of you explain me whats the problem it is?

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