Conceptually, your idea seems reasonable, but because the goal is to put the power from the solar micro-inverters onto the grid, they must lead the grid phase b

Conceptually, your idea seems reasonable, but because the goal is to put the power from the solar micro-inverters onto the grid, they must lead the grid phase by a few degrees. If they lag instead of leading, they are draining power from the grid and not supplying power into the grid. People with PV arrays want to make money by selling power into the grid. Perhaps if they were a little less greedy, they could back off the phase difference if they detect the grid phase drifting from too much "pushing." After all, they can't sell any power at all while the grid is down.