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Modeling Constant Power Load with AC Source in LTspice

 

Hi all,

I'm trying to model a constant power load fed by a single-phase AC source in LTspice. I seem to run into convergence failure when I run transient analysis

What I¡¯m doing:

  • I¡¯m using a behavioral current source with this formula:
    I = P/V(vout)

  • Where P is set dynamically using an if() function:

  • P = if(V(vout)<5,5,500)

My goal:

  • Accurately simulate a constant power source behavior under AC voltage?
  • But without simulation instability

Questions:

  • Has anyone successfully built a robust CPL model under AC excitation in LTspice?

  • Would a smoother soft-transition function (instead of if()) work better?

  • Are there other tricks to avoid convergence failures near zero crossing?
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