I´ve got a question respective the use of the player.
Is it possible to import data of voltage with the player?
Player has access to any public variable within objects. To get a list of possible variables, you can type:
gridlabd -modhelp powerflow:node
for example, to look at all of the node object properties in the powerflow module.
That said, some values may be overwritten by calculations, such as voltage in a powerflow solution. If you 'play' in a voltage, this really only becomes the initial guess for the voltage, as the solution of voltage at a particular node is driven by the source voltage, current injections, and the admittance matrix. So, really, at most nodes, that value will effectively be ignored - it may just slow down you solution time.
However, a player can be put on the SWING node voltage and it will not be overwritten by the solution. This will act as a new source voltage and drive the rest of the voltages downstream. We use this quite a bit to represent the swing of the transmission voltage over time.