Renewable energy-based hybrid bi-directionally interactive DC traction power supply system

A DC traction power supply system for supplying DC energy to an electric locomotive, comprising two traction substations (1) and a DC renewable energy system (3);

• the traction substations and the DC renewable energy system both being parallel connected to a DC bus (13) which has a positive end and a negative end and the DC renewable energy system being located between the two traction substations on the bus;
• the traction substations each comprising a first transformer (11), connected to an AC bus (5) on one side and to a rectifier (12) on another side, and a second transformer (17), connected to the AC bus on one side and to a bidirectional AC-DC converter (18) on another side;
• the rectifier and the bidirectional AC-DC converter each having two connection terminals connected the positive end and the negative end of the DC bus, respectively;
• the DC renewable energy system comprising a plurality of DC microgrids, a plurality of bidirectional DC-DC charging-discharging equipment, and a plurality of electricity generation equipments selected from the group consisting of a plurality of micro gas turbines, a plurality of solar photovoltaic cells, a plurality of fuel cells, and a plurality of wind turbine generators;
• the microgrids, charging-discharging equipments and electricity generation equipments each being parallel connected to a high voltage DC bus (4) which is further connected to the DC bus.