Hello Haroon,
First, I will address a good way to iterate your simulations. Use of the sim command which different simulaiton inputs per iterations.
Now, the second issue is how to incorporate this into your model. Here are a few but not all options:
1: realistically, you can probably use a lumped model and just have individual loads that represent multiple cars charging, and you change their load profile based on how many cars you have.
2: you model each car individually and feed it's load into the system through a controlled current source.
3: you model each car individually and connect them through switches/breakers that you toggle per iteration.
Regards,
Joel
