Smart energy system is the energy system with the characteristic of intelligence. The emergence of smart energy systems is mainly due to the difficulty of traditional energy systems to better meet the needs of human society, the rapid development of information and communication technologies, and the decline in the cost of clean energy technologies and applications. In theory, there are two representative theoretical constructs in the academic world about the idea of smart energy system. In terms of application, some advanced countries have already proposed the goal of transforming to smart energy system, and have achieved certain results in practice.