why dynamic load doesnt work and static works just fine?

i have this system with dynamic load.

when i run it with the dynamic load i get this.

when i run it with the 3 phase parallel load i have no problem:

what is the problem here. help me pls!!

Answer 1

[Joel Van Sickel]

Hello Tony,

the dynamic load adjusts it's behavior based on input, so it is easier for it to cause a simulation to go unstable (there is a feedback loop in how it determines its behavior since it responds to changes in voltage) This essentially means it requires a smaller time step to simulate than the static load. It is possible that reducing your time step smaller may at some point cause the simulation to converge. You might want to try it with a variable time step with ode23tb to see how it performs.

Regards,

Joel