# MATLAB: How to add initial states to a circuit simulation

1. Apr 23, 2013

### franciobr

Hello!

I am having trouble using the SimPowerSystems library from simulink to simulate circuits (with the powergui solver).
On all the circuits I have simulated so far either of the following happens:

- Adding the initial current/voltage directly at the RLC branch block culminates into an error message when I run the simulation that states that the initial value is being ignored.

- The powergui: "initial settings" menu either says that "There is no state variable at this model" or gets stuck at "Calculating stating variables" and displays a long warning message at the command window. The warning message is below.

It should be elementary to add initial states since there are apparently so many convenient ways of doing it (either directly at the block or at the powergui solver) but unfortunately none of them work! Please, any help would be much appreciated.

Warning message shown:

> In C:\Program Files\MATLAB\R2012b\toolbox\physmod\powersys\powersys\private\power_init_pr.p>power_init_pr at 125
In power_init at 68
In C:\Program Files\MATLAB\R2012b\toolbox\physmod\powersys\powersys\private\power_initstates_pr.p>EvaluateTheModel at 636
In C:\Program Files\MATLAB\R2012b\toolbox\physmod\powersys\powersys\private\power_initstates_pr.p>power_initstates_pr at 35
In power_initstates at 24
In C:\Program Files\MATLAB\R2012b\toolbox\physmod\powersys\powersys\powergui.p>InitialStatesSettingButton_Callback at 132
In C:\Program Files\MATLAB\R2012b\toolbox\physmod\powersys\powersys\powergui.p>powergui at 87

2. Apr 23, 2013

### kreil

3. Apr 23, 2013

### franciobr

Good idea, just submitted the request. Anyway, if anybody has the workaround for this problem any help is appreciated.