Bidirectional interactive type DC (direct-current) traction power supply system base on new energy

A bidirectional interactive type DC traction power supply system base on new energy is provided with more than two traction substations, wherein more than one transformer connected with an AC (alternating-current) bus is connected onto each traction substation; the other side of the transformer is connected with a bidirectional AC-DC converter; the other side of the bidirectional AC-DC converter is connected to a DC bus located on the traction substation; the DC bus is connected with a contact net and a steel rail; an electric locomotive is connected with the contact net and the steel rail; a section post of the DC bus is connected to the contact net of the traction substation; a DC new energy system comprising an electric automobile charge-discharge system, a distributed type power supply and more than one low-voltage DC micro-grid is arranged on the DC bus between two adjacent traction substations; and a DC circular micro-grid is formed in one power supply section. According to the bidirectional interactive type DC traction power supply system base on the new energy, distributed type new energy is fully used, and braking energy of the electric locomotive is recycled; the power supply reliability of the DC traction power supply system is improved; and bidirectional interaction of electric energy is realized.