. . . teeeeeeeeeeeeeeearrrrrrrrrrrrrrs . . .
And there you are, folks, our very special LJ rendition of the Bobby Vinton classic, Blue Velvet. The embedded comments are strictly those of the commentator and do not reflect the views of the viewers who couldn't see very much from where they were sitting anyway. Amen.
I've waited days to make this post. 1.043 days!
How about a bidirectional power converter? One that sucks as well as blows? Two-quadrant, we used to call them, able to source and sink. That certainly goes a ways toward answering the down-programming question. Suck excess energy off the output and put it in the storage cap. Of course, to do very much of that, you're going to need a very large storage cap, like a battery, for instance, or some kind of dissipater.
The basic topology is that of a buck-boost converter. The problem with getting very bidirectional is the intrinsic diodes in the likely switch devices. You would possibly (read: probably) have to go to a complementary series pair that would then have to be switched simultaneously as in a solid state relay, but, in this case, instantly as well. The practical among us have just run screaming from the building, and, if we were going to make very many of theses, I too would likely pooh-pooh* the idea, but hmmmmm . . .
Just thinking out loud . . .
*And it is "pooh-pooh," not "poo-poo," by the way--at least according to Webster. I think poo-poo is what your dog does on your living room carpet. Or in Britney Spears' case, on a $6700 designer dress. So I did get it right in that context.