Dynamic simulations with variable system control

[hccroll]

Hello, I have a question about using EXPOsan to run dynamic simulations.

I am trying to run a simulation during which I change the operating parameters of the system (CSTR DO, RWW, RAS, etc.). My approach has thus far been something like:

load starting system

for n time-steps:
     set system operating parameters
     set wastewater influent parameters
     simulate one time-step
     save new state (to be used as starting state for next time-step)
     store state values for future use in data evaluation

However, I seem to be missing how to save/load the system following a simulation, as when I try to carry out this process the system almost always fails to converge after the first time-step. Is there a way to make this work, or are there plans to incorporate this style of simulation in the future?