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An energy management system comprises a first electricity transformer with one or more first leg circuit(s), a second electricity transformer with one or more second leg circuit(s), and a control device. One or more first leg circuit(s) is (are) coupled to an energy-type supply, and one or more seco

An energy management system comprises a first electricity transformer with one or more first leg circuit(s), a second electricity transformer with one or more second leg circuit(s), and a control device. One or more first leg circuit(s) is (are) coupled to an energy-type supply, and one or more second leg circuit(s) is (are) coupled to a power-type supply. The control device will control the first and second electricity transformers operating under at least one of two conditions when a traction device is under driving mode.

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1. An energy management system, comprising: a first power converter coupled to a traction drive device and an energy-type energy source, the first power converter comprising a first leg circuit;a second power converter coupled to the traction drive device and a power-type energy source, the second p

1. An energy management system, comprising: a first power converter coupled to a traction drive device and an energy-type energy source, the first power converter comprising a first leg circuit;a second power converter coupled to the traction drive device and a power-type energy source, the second power converter comprising a plurality of second leg circuits; anda control device configured to control the first power converter and the second power converter when the traction drive device is in a motoring mode by: enabling the first leg circuit and disabling all of the second leg circuits such that the energy-type energy source provides power to the traction drive device when a positive required power of the traction drive device is less than or equal to a positive threshold power; andenabling the first leg circuit and enabling at least one of the second leg circuits such that both the energy-type energy source and power-type energy source provide power to the traction drive device when the positive required power is greater than the positive threshold power. 2. The energy management system of claim 1, wherein the control device is further configured to control the first power converter and the second power converter when the traction drive device is in a regenerating mode by: enabling the first leg circuit and disabling all of the second leg circuits such that the traction drive device provides power to charge the energy-type energy source when a negative required power of the traction drive device is greater than a negative threshold power; andenabling the first leg circuit and enabling at least one of the second leg circuits such that the traction drive device provides power to charge both the energy-type energy source and the power-type energy source when the negative required power is less than or equal to the negative threshold power. 3. The energy management system of claim 1, wherein the second power converter comprises two second leg circuits. 4. The energy management system claim 3, wherein the positive threshold power comprises a first positive threshold power and a second positive threshold power, and the control device is further configured to control the first power converter and second power converter by: enabling the first leg circuit and disabling both of the second leg circuits when the positive required power is less than or equal to the first positive threshold power;enabling the first leg circuit and one of the second leg circuits when the positive required power is greater than the first positive threshold power and less than or equal to the second positive threshold power; andenabling the first leg circuit and both of the second leg circuits when the positive required power is greater than the second positive threshold power. 5. The energy management system of claim 2, wherein the second power converter comprises two second leg circuits. 6. The energy management system of claim 5, wherein the negative threshold power comprises a first negative threshold power and a second negative threshold power, and the control device is further configured to control the first power converter and second power converter by: enabling the first leg circuit and disabling both of the second leg circuits when the negative required power is greater than the first negative threshold power;enabling the first leg circuit and one of the second leg circuits when the negative required power is greater than the second negative threshold power and less than or equal to the first negative threshold power; andenabling the first leg circuit and both of the second leg circuits when the negative required power is less than or equal to the second negative threshold power. 7. The energy management system of claim 1, wherein the first power converter further comprises a first inductor, the second power converter comprises two second leg circuits, and a second inductor, and a third inductor, wherein: each leg circuit comprises two switches connected in series between two poles of the traction drive device;a first terminal of the first inductor is coupled to the energy-type energy source, a second terminal of the first inductor is coupled to a connection point of the two switches of the first leg circuit;a first terminal of the second inductor is coupled to the power-type energy source, a second terminal of the second inductor is coupled to a connection point of the two switches of one of the second leg circuits; anda first terminal of the third inductor is coupled to the power-type energy source, a second terminal of the third inductor is coupled to a connection point of the two switches of the other of the second leg circuits. 8. The energy management system of claim 2, further comprising a pair of direct current (DC) links, wherein: the first power converter is coupled to the traction drive device via one of the DC links, the second power converter is coupled to the traction drive device via the other of the DC links; and the control device is further configured to determine the positive required power and the negative required power according to a command voltage of the DC links and a measured voltage of the DC links. 9. The energy management system of claim 8, wherein the control device is further configured to: estimate an estimated load power of the traction drive device; and determine the positive required power and the negative required power according to the estimated load power. 10. An energy management method, comprising: coupling a first power converter and a second power converter to a traction drive device, the first power converter comprising a first leg circuit and the second power converter comprising a plurality of second leg circuits;coupling the first leg circuit to an energy-type energy source;coupling the plurality of second leg circuits to a power-type energy source;controlling the first power converter and the second power converter when the traction drive device is in a motoring mode by: enabling the first leg circuit and disabling all of the second leg circuits such that the energy-type energy source provides power to the traction drive device when a positive required power of the traction drive device is less than or equal to a positive threshold power; andenabling the first leg circuit and enabling at least one of the second leg circuits such that both the energy-type energy source and power-type energy source provide power to the traction drive device when the positive required power is greater than the positive threshold power. 11. The energy management method of claim 10, further comprising: controlling the first power converter and the second power converter when the traction drive device is in a regenerating mode by: enabling the first leg circuit and disabling all of the second leg circuits such that the traction drive device provides power to charge the energy-type energy source when a negative required power of the traction drive device is greater than a negative threshold power; andenabling the first leg circuit and enabling at least one of the second leg circuits such that the traction drive device provides power to charge both the energy-type energy source and the power-type energy source when the negative required power is less than or equal to the negative threshold power. 12. The energy management method of claim 10, wherein the second power converter comprises two second leg circuits. 13. The energy management method of claim 12, wherein the positive threshold power comprises a first positive threshold power and a second positive threshold power, and the energy management method further comprises controlling the first power converter and second power converter by: enabling the first leg circuit and disabling both of the second leg circuits when the positive required power is less than or equal to the first positive threshold power;enabling the first leg circuit and one of the second leg circuits when the positive required power is greater than the first positive threshold power and less than or equal to the second positive threshold power; andenabling the first leg circuit and both of the second leg circuits when the positive required power is greater than the second positive threshold power. 14. The energy management method of claim 11, wherein the second power converter comprises two second leg circuits. 15. The energy management method of claim 14, wherein the positive threshold power comprises a first negative threshold power and a second negative threshold power, and the energy management method further comprises controlling the first power converter and second power converter by: enabling the first leg circuit and disabling both of the second leg circuits when the negative required power is greater than the first negative threshold power;enabling the first leg circuit and one of the second leg circuits when the negative required power is greater than the second negative threshold power and less than or equal to the first negative threshold power; andenabling the first leg circuit and both of the second leg circuits when the negative required power is less than or equal to the second negative threshold power. 16. The energy management method of claim 10, further comprising determining the positive required power and the negative required power according to a command voltage of the traction drive device and a measured voltage of the traction drive device. 17. The energy management method of claim 16, wherein determining the positive required power and the negative required power comprises: estimating an estimated load power of the traction drive device and determining the positive required power and the negative required power according to the estimated load power. 18. An energy management system, comprising: an energy-type energy source;a power-type energy source;a power converter coupled to a traction drive device, the power converter comprising a first leg circuit coupled to the energy-type energy source and two second leg circuits coupled to the power-type energy source; anda control device configured to control the power converter when the traction drive device is in a motoring mode by: enabling the first leg circuit and disabling both of the second leg circuits when the positive required power is less than or equal to the first positive threshold power;enabling the first leg circuit and one of the second leg circuits when the positive required power is greater than the first positive threshold power and less than or equal to the second positive threshold power; andenabling the first leg circuit and both of the second leg circuits when the positive required power is greater than the second positive threshold power. 19. The energy management system of claim 18, wherein the control device is further configured to control the power converter when the traction drive device is in a regenerating mode by:enabling the first leg circuit and disabling both of the second leg circuits when the negative required power is greater than the first negative threshold power;enabling the first leg circuit and one of the second leg circuits when the negative required power is greater than the second negative threshold power and less than or equal to the first negative threshold power; andenabling the first leg circuit and both of the second leg circuits when the negative required power is less than or equal to the second negative threshold power.