With the rapid development of power system and the deepening construction of smart grid, 5G communication technology is favored by all walks of life because of its ultra-low delay, ultra-high reliability, deep coverage, extreme capacity and ultra-low power consumption. It has become the key technology to lead scientific and technological innovation and promote the sustainable development of power system, providing a solid guarantee for the realization of human-computer interaction and Internet of Everything. This paper first introduces the network structure, basic principle and core features of 5G communication, and expounds the core slice of 5G communication and its three application scenarios; secondly, the potential demand scenarios of 5G communication in power system are analyzed in depth, that is, high capacity, high bandwidth and low delay business scenarios; finally, the key technologies of 5G communication, such as large-scale MIMO communication technology, ultra-dense heterogeneous network technology, green communication technology and millimeter wave communication technology, are discussed, and the linkage between current communication requirements and communication technologies is studied, which provides theoretical support for the application of 5G communication in power system.

5G technology has been continuously promoted and has become a key driving force to promote the development of all walks of life and assist the national strategic decision-making. In the era of Internet of Everything, 5G network slicing technology, with its advantages of low latency, high security and scheduling, can better realize the rational and efficient scheduling and allocation of network resources, and fully improve the effective utilization rate of resources. This paper systematically summarizes the network slicing technology, analyzes the application of 5G network slicing technology in different power Internet of Things business scenarios and communication requirements, and puts forward the challenges that 5G network slicing technology in smart grid may face in the future, aiming at providing theoretical basis for the further development of 5G technology and promoting the continuous development of 5G smart grid application.