(Aiming at the many challenges faced by the power system in the new century, such as the integration of distributed power sources, the low utilization factor of power grids, and the use of digital technology, the concept of smart grid is proposed, and the characteristics, solutions and primary components of smart grids are discussed. , estimated the investment and benefit of smart grid, pointed out that smart grid is the inevitable result of economic and technological development, and the research on smart grid in my country should be accelerated.)