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Since the grid voltage is sinusoidal, when grid voltage starts at 0 and goes sinusoidally towards the peak so is the current so the control rule is voltage goes up, current goes up too to maintain the sinusoidal nature.

Regarding the setpoint, the problem is that the bulk capacitor voltage of the PFC dictate how much current needs to be pushed towards the grid regardless of the nominal grid voltage (load pushes energy to the bulk which then pfc pushes energy to the grid). And what is the nominal grid voltage? Grid voltage levels varies from place to place, load, time of day.