With the expansion of the construction scale of the power grid and the promotion of digital economy

the digitalization and intelligence of the power grid have become an urgent need for the development of the power industry. Digital twin（DT） technology

which is based on information technology system such as digital identification

automated sensing

networked connection

inclusive computing

intelligent control

and platform services

provides new ideas and approaches for promoting safe and stable operation of power grid and building energy internet enterprises. In this paper

based on the concept

basic structure

and characteristics of DT

the connotation of the DT power grid was proposed

the framework of the DT power grid was constructed

the operation mode of DT power grid was introduced

and the key technologies of DT power grid was analyzed. Moreover

typical applications including equipment layer

power grid layer

business layer and operation management layer were proposed. The research provides theoretical support for the construction of DT power grid

and guides the development direction and construction ideas for DT power grid.