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Yes, but in the line where I'm monitoring the power flow (P and Q) I only have connected in one side the inverter and at the another one a GENCLS generator and a load, both simulating the grid. (I can't upload any picture due to I don't have "karma" enough...) So the line flow means what is injecting the inverter. Besides, I've alse monitores Pelec and Qelec (arrays from the inverter) and they contain the same values as the Power Flow values.

The bus "Grid" is defined as the swing bus and the bus "inverter" is defined as a generator bus, but when I make the conversion for dynamic simulation, both buses are generator bus.

Concluding, my scheme only has 2 buses, 1 line, 2 generator (inverter and GENCLS) and 1 load.

Regarding the first question, you're right, it has no sense that if I'm ordering from the control a real current = 0, the inverter is injecting P different from 0... So I think that the generator module doesn't recognize the WIPCMD1 and WIQCMD1 arrays as inputs (but I can not modify them because are standards modules from PSS/E and in other times it works perfectly..). The values of those arrays are OK because I can monitor them from my control module and, for example, in the previous case I obtain WIPCMD1=0 if order P=0, but I think that the generator module does recognize WIPCMD different from 0... I don't know why...