Research on subway energy internet based on power electronic transformer

With a rapid development of urban rail transit, the issues of a great amount of energy consumption, serious carbon emission, noise pollution are increasingly becoming the focus of social attention. Existing subway power supply system is facing a severe challenge which is that the power system needs upgrading to a more intelligent system to adapt to the green transportation and the internet Plus. To solve these problems, a new subway energy Internet (SEI) solution based on power electronic transformer (PET) is proposed in this paper. The communication system and control mode are also descript in detail. Moreover, the advanced applications for SEI are pointed out as well. This solution can further enhance the safety of the subway power supply system, realize “Plug and Play” functions for the energy-saving equipment and distributed generators, change the DC voltage of rectifier system to achieve flexible traction, and control the flow of energy in subway power supply system precisely and quickly.