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SPLL 3PH SRF module question

Hi,

I started playing with your pll module for 3 phase grids without taking into account inbalances. From what I understand, I have to use ABC_TO_DQ with phase voltages, Va, Vb, Vc. What if I only have Line-Line voltage Vab, Vca, Vbc? Can I still use the ABC_TO_DQ and use the Vq for the PLL synchronization?

I did some tests on a bench to verify if the theta that the SRF PLL outputs is synced with my voltages and I noticed that Cos(theta[1]) is synced with my Vab. I can't figure out why the Cos is the right one instead of Sin...

Thanks