VSPR - Variable-speed pitch-regulated
VDSPR is a control strategy for WTs. Arguably all modern, utility scale wind turbines use VSPR. It means that the rotor has variable speed depending on the wind speed. The benefit of variable speed is to keep the power coefficient at or close to maximum for all wind speeds below rated wind speed, thus maximizing power.
Additionally, it measn that the WT has a pitch system to reduce the power for wind speeds above rated wind speed. Pitch-to-feather is the only pitch methodology used today (as opposed to pitch-to-stall that earlier was also in use).