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Unable to run simulation for a PV microgrid

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Ajibola Adeleke
Ajibola Adeleke on 27 Jul 2021
Edited: Kiran Felix Robert on 24 Sep 2021 at 7:25
I keep getting the error below when running my simulation for a PV microgrid:
An error occurred while running the simulation and the simulation was terminated
Caused by:
Derivative of state '1' in block 'untitled_real/PV Array/Diode Rsh/Transfer Fcn' at time 0.01 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)

Answers (1)

Kiran Felix Robert
Kiran Felix Robert on 24 Sep 2021 at 7:24
Edited: Kiran Felix Robert on 24 Sep 2021 at 7:25
Hi Ajibola,
This message may be caused by a singularity in your system. One situation where this may occur is if the values of your states differ by a large magnitude. If this is the case, the Simulink solver will have a hard time resolving your step size within the error tolerance as it attempts to "bounce" back and forth between the states.
To check if this is the case:
1. Return the states of your system as follows:
a) In the model editor go to Simulation-> Configuration Parameters
b) Select Data Import/Export, in the 'Save to Workspace' field, check 'States' to log the states as output
2. Run the simulation.
3. Plot:
plot(tout,xout)
You can see if one of the states is changing over a wide range compared to the others.
There are a couple of things you can do to try to correct this situation.
If possible, you may want to rescale the model so that the states are within a couple of orders of magnitude of one another.
Also, you can set specific error tolerances for the integrator blocks (if any) in your system.
For more information, please refer to 'Specifying the Absolute Tolerance for the Block's Outputs' section in the Integrator block documentation by entering
doc integrator
at the MATLAB command prompt.
To Resolve these, you may also try the following:
Use a stiff solver (e.g. ode15s)
Decrease initial step size, maximum step size, and relative tolerance

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