MATLAB: How to solve the block error in the simulink model

error messagesimulink

Hi,
When I run my state space model, I get the following error message,
Derivative input 5 of 'statespacemodel_hvm/State-Space' at time 2.2297592983646024 is Inf or NaN. Stopping simulation. 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)
Usually, the simulation diagnostics viewer shows the region where the error has caused, but I can't find it.
Please drop your suggestions as why this error could have occurred.

Best Answer

There are a couple of things you might want to consider:
  • Is the system unstable (by design)? Therefore, does it need to be controlled?
  • If it is stable, there could be a "bug" in the code that makes the system unstable.
  • Third, are you using the right solver and solver settings? Open Simulation > Model Configuration Parameters and check out the solver options. ode45 might be the best choice to get started. Try reducing the absolute and relative tolerances.
  • Lastly, try the debugger .
Related Question