Profesor Rikiya Abe (The University of Tokyo) has been interviews about the Digital Grid concept.

Professor Rikiya Abe (University of Tokyo) speaks about basic ideas about the Digital Grid.

Here is a short video of the digital grid team describing what is important about the digital grid

Japan has several "frequency converter" sites, one of which is the Sakuma plant which converts 300 MW of power between 50 Hz and 60 Hz segments of the grid. These power plants are "proof of concept" for the digital grid concept, since they show that very large scale controlled asynchronous connections between networks are possible. This video is a tour of the Sakuma plan.