Totally off the wall fourth way (which probably has a ton of reasons it would not work): have shutters in front of each panel, and as power the load draws fluctuates, block and unblock panels so that a given panel only generates power when that power can be fully used.
If the panels are small enough, you could get a pretty good approximation to a sinusoidal output from the array of panels.
The shuttering system doesn't actually have to be shutters. Anything that can block panels with the right timing would do. You could probably do something with rotating discs with holes or slots in them, where the phase between adjacent discs can be adjusted to control have often the holes or slots align to let light through.
If the panels are small enough, you could get a pretty good approximation to a sinusoidal output from the array of panels.
The shuttering system doesn't actually have to be shutters. Anything that can block panels with the right timing would do. You could probably do something with rotating discs with holes or slots in them, where the phase between adjacent discs can be adjusted to control have often the holes or slots align to let light through.