simulink ode error message

i am applying pwm on dc/dc converter I connected between simulink element and semipower element bu voltage controlled source ,and select ode45 with variable step but it gives bad response so i used ode fixed step but it gave this error message

 " Derivative input 2 of 'chee_pv/boost converter1/powergui/EquivalentModel1/State-Space' at time 6.750000000000001 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)."

Answer 1

[mado]

any help ?? errors came when i connect the controlled voltage source to last stage.

Answer 2

[Sulaymon Eshkabilov]

Hi,

Maybe you can try to adjust the relative and absolute error tolerances via solver options or simset('reltol', value, 'abstol', value). It is a bit difficult to suggest any idea without seeing your model itself though.