SymPowerSystem : Production consumption problem

Hi everybody,

I'm currently trying to simulate the consumption of a small village which have threephase and sinlgephase consumers (set to 400 Vrms). I'm using a three phases source to simulate the grid and a transformer to transform 400Vrms to 230V for single phase consumer. The consumption (in w) is coming from monitoring data, from which a can simulate the current consumed (knowing the tension). Problem is, in my simulation, measured production is different than measured consumption.

From where the problem is coming, according to you ?

Romain