Future power grid — Multiple-level DC loop grid and "Cloud Powering"

In the future,the renewable energy will be the dominant energy.Due to the special performance and the distribution picture of the renewable energy,it will need to develop a corresponding future power grid.In this paper,we suggest that a multiple-level DC loop grid would be the suitable mode for power grid,in which DC-based loop grid for wide-area transmission system,distribution system and distributed network should be developed,and all the power sources and customers would be connected to the loop grids.The power transmission line and cable are used to connect all the loops.Therefore,the future power grid would be able to make full use of the complementarities of all of the energy resources distributed in the wide area including large-scale power plants and distributed power plants.This means that the future power supply would be a "Cloud Powering" mode other than the present mode.