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strange results during solar PV output power ramp-up
I am running a dynamic simulation with solar PV power plant and other conventional generators. The solar PV plant is represented as PVGU1, PVEU1, PANELU1 and IRRADU1.
solar PV output is zero initially, then it ramp up to 1pu in several secs by changing the irradiance level. The results show strange "spikes" in the output power and voltage. see the figures in dropbox link. The spikes are seen in all the generator outputs and all bus voltages, but not in system frequency and generator mechanical power.
https://www.dropbox.com/s/7i5rfz646y8kg2x/1.png?dl=0 https://www.dropbox.com/s/m38axowrc96yyfu/2.png?dl=0
The spikes are not seen in a PV ramp-down case. Anyone has idea what cause this problem?
