Hi.

Can someone explain what it means for a generator to import reactive power?

My understanding of reactive power is when the voltage and current waveforms are out of phase by 90 degrees due to reactance in a system.

What exactly does it mean if a generator set imports VARs?

How can I visualize this in terms of what is happening to the voltage and current curves at the generator point of connection to the grid?

 

a wind generator running a little slow can absorb power from the line.

 

The only thing I have seen a generator import is torque.

 

That may be referring to overexcited synchronous machines.
Such a machine generates a leading reactive component, which acts like a large capacitor, absorbing the lagging reactive current such as from inductive motors.
Here's a discussion of that.