I am simulating a wind turbine with a flexible drivetrain in simulink. I am using a two mass model to model the oscillations on the drivetrain.

Whenever I run a simulation with a smooth change in the power output of the turbine it ends up oscillating and the simulation quits with the error message:
"Solver encountered an error while simulating model ‘WecsNoConverter’ at time 47.9683593447728 and cannot continue. Please check the model for errors.
Nonlinear iteration is not converging with step size reduced to hmin (1.70418E-13) at time 47.9684. Try reducing the minimum step size and/or relax the relative error tolerance."

I am using ode15s as the solver. I have tried relaxing the relative error tolerance but it appears to make no difference. Enabling shape preservation makes no difference. Decreasing the max order increases the lenght of time before the system oscillates to infinity. The results above are with a max order of 1. Any max order of 2-4 makes results in the above behaviour happening sooner. I have tried other solvers but ode15s gives me the best results

One thing which fixes the simulation is to increase the damping term on the two mass model. Which results in the smooth output as shown below. However, this means the model is not accurate to the original turbine, so this is not an option.

Are there any other options I can try to get the simulation to run the full length of time?I am simulating a wind turbine with a flexible drivetrain in simulink. I am using a two mass model to model the oscillations on the drivetrain.

Whenever I run a simulation with a smooth change in the power output of the turbine it ends up oscillating and the simulation quits with the error message:
"Solver encountered an error while simulating model ‘WecsNoConverter’ at time 47.9683593447728 and cannot continue. Please check the model for errors.
Nonlinear iteration is not converging with step size reduced to hmin (1.70418E-13) at time 47.9684. Try reducing the minimum step size and/or relax the relative error tolerance."

I am using ode15s as the solver. I have tried relaxing the relative error tolerance but it appears to make no difference. Enabling shape preservation makes no difference. Decreasing the max order increases the lenght of time before the system oscillates to infinity. The results above are with a max order of 1. Any max order of 2-4 makes results in the above behaviour happening sooner. I have tried other solvers but ode15s gives me the best results

One thing which fixes the simulation is to increase the damping term on the two mass model. Which results in the smooth output as shown below. However, this means the model is not accurate to the original turbine, so this is not an option.

Are there any other options I can try to get the simulation to run the full length of time? I am simulating a wind turbine with a flexible drivetrain in simulink. I am using a two mass model to model the oscillations on the drivetrain.

Whenever I run a simulation with a smooth change in the power output of the turbine it ends up oscillating and the simulation quits with the error message:
"Solver encountered an error while simulating model ‘WecsNoConverter’ at time 47.9683593447728 and cannot continue. Please check the model for errors.
Nonlinear iteration is not converging with step size reduced to hmin (1.70418E-13) at time 47.9684. Try reducing the minimum step size and/or relax the relative error tolerance."

I am using ode15s as the solver. I have tried relaxing the relative error tolerance but it appears to make no difference. Enabling shape preservation makes no difference. Decreasing the max order increases the lenght of time before the system oscillates to infinity. The results above are with a max order of 1. Any max order of 2-4 makes results in the above behaviour happening sooner. I have tried other solvers but ode15s gives me the best results

One thing which fixes the simulation is to increase the damping term on the two mass model. Which results in the smooth output as shown below. However, this means the model is not accurate to the original turbine, so this is not an option.

Are there any other options I can try to get the simulation to run the full length of time? nonlinear, simulink, simulation, unstable, oscillation, ode, ode15s, instability MATLAB Answers — New Questions

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