Thanks for your quick reply!
First of all, is it necessary to implement this model in discrete domain?
Because I not sure this is a correct step or not. Or just continuous domain implementation is fine?
>you’ll want to adjust the discretization technique to account for the desired gain at 60 Hz.
Is this means the discretization model somewhat have problems cause the db magnitude is nonzero value in the small signal analysis?
>Your angle value is not limited and does not have any roll over. As the angle increases to very high values over time, the floating point value will lose resolution. You’ll want to adjust your integrator to wrap instead of using the “Mod” approach.
I noticed a problem before, which is the magnitude will change as the time goes. Is this issue give rise to this problem? Therefore, to deal with this problem, I have to turn on “enable wrapping” in discrete integrtor and set the upper limit as 2*pi. Is that