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To get the P-Q capability curve of a solar plant at its POI - In the load flow case, choose an operating mode for the solar plant (k-power factor, v-control...) and choose a voltage setting (typical value of operation or 1.0). Also choose a MW increment (maybe 10% of Pmax). It is important to have a line separating the POI bus of the solar plant from the SMIB generator. Then:

1- dispatch the solar plant at Pmin (say 10% of Pmax)
2- solve the load flow and record the P and Q output leaving the POI bus, point (Ppoi, Qpoi)
3- add the MW increment to the dispatch value of the solar plant (say now at 20%)
4- go to step 2 and repeat until the solar plant reaches its Pmax value

I would recommend to perform such study in a realistic network at the POI where the solar plant is located.