Hi everybody,

I'm a beginner with LTspice, so I'm sorry if my question is related to some basic knowledge that I don't know..any help is really appreciate!!

I can't solve a problem with my circuit in LTspice: I have this error "singular matrix check node vout+" and I don't know what to do.

I attached also the .asc file and the control library necessary for the PI controllers.

 

hi CC
This is what I see.
E

 

Hi!

mmh..what I see in my plot is different:

vout+ has to increase because I have 3 controllers which purpose is to bring Vout (vout+ - vout-) = Vout_sp (400V in my case)

 

Hi CC,
I have not made any changes to your posted asc file, did you post the correct one?
E

 

Hi Eric,

I think so but I post it again. I noticed that in your circuit the PI controllers are missing: maybe this is the reason why you have a different result? You should import the Control.lib that I posted.