A new energy locomotive power supply system with multiple power sources

Abstract

The application discloses a new energy locomotive power supply system with multiple power sources, wherein in the case that a group of power batteries of a pure electric locomotive or hydrogen fuel batteries of a hydrogen fuel locomotive is connected to a first power source interface assembly, a first power source conversion module corresponding to the first power source interface assembly performs chopper processing on a direct-current power source connected thereto; in the case that a main generator of an internal combustion locomotive is connected to the first power source interface assembly, the first power source conversion module corresponding to the first power source interface assembly performs rectification processing on an alternating-current power source connected thereto; and a second power source conversion module performs chopper processing on a direct-current power source connected thereto, so that conversion of multiple power sources is realized; the system can change the working state of the conversion module according to a corresponding power supply power source, so that the system can adapt to multiple power supply modes, and the application range of the system is widened.

Description

Technical Field

[0001] This invention relates to the field of locomotive power supply technology, and in particular to a new energy locomotive power supply system with multiple power sources. Background Technology

[0002] As the concept of green development gains popularity, new energy locomotives are gradually replacing traditional locomotives and becoming the main mode of transportation.

[0003] Currently, most new energy vehicles, both domestically and internationally, adopt one of three power supply modes: "internal combustion engine + power battery hybrid power supply", "power battery power supply alone", or "hydrogen fuel cell + power battery hybrid power supply".

[0004] However, the power supply systems of existing new energy locomotives can often only achieve power conversion of one of the above-mentioned power supply modes, which limits their applicability. Summary of the Invention

[0005] This invention provides a new energy locomotive power supply system with multiple power sources, enabling the system to adapt to various power supply modes and broadening its applicability.

[0006] The multi-power source new energy locomotive power supply system includes a first power interface component, a second power interface component, a first power conversion module corresponding to the first power interface component, a second power conversion module corresponding to the second power interface component, a DC conversion module, at least four power interface components, and a converter corresponding to each of the power interface components. The first power interface component is used to connect an external power battery of a pure electric locomotive, the main generator of an internal electric locomotive, or the hydrogen fuel cell of a hydrogen fuel cell locomotive; the second power interface is used to connect an external power battery of a pure electric locomotive, the power battery of an internal electric locomotive, or the power battery of a fuel cell locomotive. The input terminal of the first power conversion module is connected to the first power interface component, the input terminal of the second power conversion module is connected to the second power interface component, and the output terminals of the first power conversion module and the second power conversion module are respectively connected to the input terminal of the DC-DC conversion module. The input terminals of each converter are connected to the output terminals of the DC-DC conversion module, and the output terminals of each converter are connected to their corresponding power supply interface components. Each power supply interface component is used to externally connect to each traction motor of the pure electric locomotive, each traction motor of the internal electric locomotive, or each traction motor of the hydrogen fuel cell locomotive. When the first power interface component is connected to a set of power batteries of the pure electric locomotive or a hydrogen fuel cell of the hydrogen fuel cell locomotive, the first power conversion module corresponding to the first power interface component performs chopping processing on the input DC power; when the first power interface component is connected to the main generator of the internal electric locomotive, the first power conversion module corresponding to the first power interface component performs rectification processing on the input AC power; and the second power conversion module performs chopping processing on the input DC power.

[0007] Optionally, the power battery includes a first output terminal pair and a second output terminal pair; the hydrogen fuel cell includes a third output terminal pair; and the main generator includes a first phase output terminal, a second phase output terminal, and a third phase output terminal. The first power interface assembly includes a first interface, a second interface, a third interface, and a fourth interface; the first interface and the second interface are used to connect to the positive and negative terminals of the third output terminal pair of the hydrogen fuel cell corresponding to the first power interface assembly, respectively; the first interface, the second interface, and the third interface are also used to connect to the first phase output terminal, the second phase output terminal, and the third phase output terminal of the main generator corresponding to the first power interface assembly, respectively; the first interface, the second interface, the third interface, and the fourth interface are also used to connect to the positive terminal of the first output terminal pair, the negative terminal of the first output terminal pair, the positive terminal of the second output terminal pair, and the negative terminal of the second output terminal pair of the power battery corresponding to the first power interface assembly, one-to-one; Correspondingly, the first power conversion module includes a first state switching switch, a second state switching switch, a first bridge arm, a second bridge arm, and a third bridge arm; wherein, the input terminal of the first bridge arm is connected to the corresponding first interface; the input terminal of the second bridge arm is connected to the corresponding second interface via the first state switching switch; the input terminal of the third bridge arm is connected to the corresponding third interface; the common anode point of each bridge arm is connected to the corresponding fourth interface; and the second state switching switch is disposed between the corresponding second interface and the fourth interface. When the first power interface component is connected to a set of power batteries of the pure electric locomotive or a hydrogen fuel cell of the hydrogen fuel cell locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned off and the second state switching switch is turned on; when the first power interface component is connected to the main generator of the internal electric locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned on and the second state switching switch is turned off.

[0008] Optionally, the second power interface assembly includes a fifth interface, a sixth interface, a seventh interface, and an eighth interface; the fifth interface, the sixth interface, the seventh interface, and the eighth interface are used to connect one-to-one with the positive terminal of the first output terminal pair, the negative terminal of the first output terminal pair, the positive terminal of the second output terminal pair, and the negative terminal of the second output terminal pair of the power battery corresponding to the second power interface assembly; The second power conversion module includes a fifth bridge arm and a sixth bridge arm; wherein, the input terminal of the fifth bridge arm is connected to the corresponding fifth interface; the input terminal of the sixth bridge arm is connected to the corresponding seventh interface; and the common anode point of each bridge arm is connected to the corresponding sixth interface and the eighth interface, respectively.

[0009] Optionally, the pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all four-axle locomotives; the number of the power supply interface assembly and the converter is not less than 4; When the system supplies power to the four-axle pure electric vehicle, the first power interface component is connected to one set of power batteries of the four-axle pure electric vehicle, the second power interface component is connected to another set of power batteries of the four-axle pure electric vehicle, and the four power interface components are connected to the four traction motors of the four-axle pure electric vehicle one by one. The first state switching switch in the first power conversion module corresponding to the first power interface component is turned off, and the second state switching switch is turned on.

[0010] Optionally, the pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all four-axle locomotives; the number of the power supply interface assembly and the converter is not less than 4; When the system supplies power to the four-axle internal electric locomotive, the first power interface component is externally connected to the main generator of the four-axle internal electric locomotive, the second power interface component is externally connected to the power battery of the four-axle internal electric locomotive, the four power interface components are connected one-to-one with the four traction motors of the four-axle internal electric locomotive, and the first state switching switch in the first power conversion module corresponding to the first power interface component is turned on while the second state switching switch is turned off.

[0011] Optionally, the pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all four-axle locomotives; the number of the power supply interface assembly and the converter is not less than 4; When the system supplies power to the four-axle hydrogen fuel cell locomotive, the first power interface component is externally connected to the hydrogen fuel cell of the four-axle hydrogen fuel cell locomotive, the second power interface component is externally connected to the power battery of the four-axle hydrogen fuel cell locomotive, the four power interface components are connected one-to-one with the four traction motors of the four-axle hydrogen fuel cell locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned off while the second state switching switch is turned on.

[0012] Optionally, the pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all six-axle locomotives; the number of the power supply interface assembly and the converter is 6; the number of the first power interface assembly and the second power interface assembly is 2 each; When the system supplies power to the six-axle pure electric vehicle, one of the first power interface components is connected to the first set of power batteries of the six-axle pure electric vehicle, one of the second power interface components is connected to the second set of power batteries of the six-axle pure electric vehicle, another of the first power interface components is connected to the third set of power batteries of the six-axle pure electric vehicle, another of the second power interface components is connected to the fourth set of power batteries of the six-axle pure electric vehicle, and the six power interface components are connected one-to-one with the six traction motors of the six-axle pure electric vehicle. The first state switching switches in the first power conversion modules corresponding to the two first power interface components are all turned off, while the second state switching switches are all turned on.

[0013] Optionally, the pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all six-axle locomotives; the number of the power supply interface assembly and the converter is 6; the number of the first power interface assembly and the second power interface assembly is 2 each; When the system supplies power to the six-axle internal electric locomotive, one first power interface component is externally connected to the first set of power batteries of the six-axle internal electric locomotive, one second power interface component is externally connected to the second set of power batteries of the six-axle internal electric locomotive, another first power interface component is externally connected to the main generator of the six-axle internal electric locomotive, and the six power interface components are connected one-to-one with the six traction motors of the six-axle internal electric locomotive. The first state switching switch in the first power conversion module corresponding to the first power interface component externally connected to the first set of power batteries of the six-axle internal electric locomotive is turned off while the second state switching switch is turned on. In addition, the first state switching switch in the first power conversion module corresponding to the first power interface component externally connected to the main generator of the six-axle internal electric locomotive is turned on while the second state switching switch is turned off.

[0014] Optionally, the pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all six-axle locomotives; the number of the power supply interface assembly and the converter is 6; the number of the first power interface assembly and the second power interface assembly is 2 each; When the system supplies power to the six-axle hydrogen fuel cell locomotive, one of the first power interface components is externally connected to the first set of power batteries of the six-axle hydrogen fuel cell locomotive, one of the second power interface components is externally connected to the second set of power batteries of the six-axle hydrogen fuel cell locomotive, another of the first power interface components is externally connected to the hydrogen fuel cell of the six-axle hydrogen fuel cell locomotive, the six power interface components are connected one-to-one with the six traction motors of the six-axle hydrogen fuel cell locomotive, and the first state switching switches in the first power conversion modules corresponding to the two first power interface components are both turned off while the second state switching switches are both turned on.

[0015] Optionally, the first power conversion module further includes a fourth bridge arm, a first controllable switch, and a second controllable switch; the input terminal of the first bridge arm is connected to the input terminal of the second bridge arm via the first controllable switch, and the input terminal of the third bridge arm is connected to the input terminal of the fourth bridge arm via the second controllable switch; the on / off states of the first controllable switch and the second controllable switch are the same as the states of the corresponding second state switching switches; And / or, in the first power conversion module, the number of the first bridge arms, the number of the second bridge arms, and the number of the third bridge arms are all greater than 1; the input terminals of each of the first bridge arms are interconnected, the input terminals of each of the second bridge arms are interconnected, and the input terminals of each of the third bridge arms are interconnected.

[0016] Optionally, in the second power conversion module, the number of the fifth bridge arm and the sixth bridge arm is greater than 1, and the input terminals of each fifth bridge arm are interconnected and the input terminals of each sixth bridge arm are interconnected.

[0017] This invention proposes a multi-power source power supply system for new energy locomotives. In this system, when a set of power batteries from a pure electric locomotive or a hydrogen fuel cell from a hydrogen fuel cell locomotive is connected to the first power interface component, a first power conversion module corresponding to the first power interface component performs chopping processing on the input DC power. When the main generator of an internal electric locomotive is connected to the first power interface component, the first power conversion module corresponding to the first power interface component performs rectification processing on the input AC power. A second power conversion module performs chopping processing on the input DC power, achieving conversion between multiple power sources. This system can change the operating state of the conversion modules according to the corresponding power supply, enabling the system to adapt to multiple power supply modes and broadening its applicability.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a multi-power source new energy locomotive power supply system and its external related devices, as proposed in an embodiment of the present invention. Figure 2 A schematic diagram illustrating the connection relationship between a first power interface component and its corresponding first power conversion module, provided in an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the connection relationship between a first power interface component, a second power interface component, and their corresponding conversion modules, provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of another multi-power source new energy locomotive power supply system and its external related devices proposed in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the composition of another new energy locomotive power supply system with multiple power sources and its external related devices, as proposed in an embodiment of the present invention. Figure 6 This is a schematic diagram illustrating the composition of another new energy locomotive power supply system with multiple power sources and its external related devices, as proposed in an embodiment of the present invention. Figure 7 This is a schematic diagram illustrating the composition of another new energy locomotive power supply system with multiple power sources and its external related devices, as proposed in an embodiment of the present invention. Figure 8 This is a schematic diagram illustrating the composition of another new energy locomotive power supply system with multiple power sources and its external related devices, as proposed in an embodiment of the present invention. Figure 9 This is a schematic diagram illustrating the composition of another new energy locomotive power supply system with multiple power sources and its external related devices, as proposed in an embodiment of the present invention. Figure 10 Circuit diagrams of two first power interface components and their corresponding first power conversion modules provided in embodiments of the present invention; Figure 11 This is a circuit diagram of a second power interface component and its corresponding second power conversion module provided in an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] As mentioned in the background technology, currently, most new energy locomotives both domestically and internationally adopt one of three power supply modes: "internal combustion engine + power battery hybrid power supply," "power battery independent power supply," or "hydrogen fuel cell + power battery hybrid power supply." Among these, the "internal combustion engine + power battery hybrid power supply" locomotive is an electric locomotive, equipped with at least one pair of main generators and power batteries. The main generator can be a diesel generator, which simultaneously provides power to the locomotive and charges the power batteries. After the power batteries are fully charged, they can be used as a power source to power the locomotive. When the power batteries are depleted, the diesel generator can automatically start to charge them according to control logic, and can also charge the power batteries via an external power source. The "power battery independent power supply" locomotive is a pure electric locomotive, equipped with at least two pairs of power batteries as its power source. When the power batteries are depleted or need charging, they can be charged via an external power source. The "hydrogen fuel cell + power battery hybrid power supply" locomotive is a hydrogen fuel cell locomotive. This locomotive is equipped with at least one pair of hydrogen fuel cells and power batteries. Both the power battery and the hydrogen fuel cell can provide power to the locomotive. When the power battery is depleted, the hydrogen fuel cell can charge the power battery by burning hydrogen. It can also be charged by an external power source.

[0024] However, the current power supply system on locomotives is designed separately for each power supply mode, and can only realize the power conversion of one of the above power supply modes. It is only applicable to locomotives with a single power supply mode and has a very small scope of application.

[0025] To address the aforementioned issues, this invention proposes a multi-power-source new energy locomotive power supply system. This system can achieve at least the above three power supply modes and can be applied to locomotives with different power supply modes, providing corresponding power supply modes for locomotives with different power supply types. Figure 1 This is a schematic diagram illustrating the composition of a multi-power source power supply system for a new energy locomotive and its external related components, as proposed in an embodiment of the present invention. For simplicity, each interface component in the diagram only shows a single interface as an example, illustrating the connection relationship between the system and its external components. Figure 1 The new energy locomotive power supply system 100 with multiple power sources includes a first power interface component 101, a second power interface component 102, a first power conversion module 103 corresponding to the first power interface component 101, a second power conversion module 104 corresponding to the second power interface component 102, a DC-DC conversion module 105, at least four power interface components 106, and a converter 107 corresponding to each power interface component 106.

[0026] The first power interface assembly 101 is used to connect an external power battery 109 of a pure electric locomotive, a main generator 110 of an internal electric locomotive, or a hydrogen fuel cell 111 of a hydrogen fuel cell locomotive; the second power interface assembly 102 is used to connect an external power battery 109 of a pure electric locomotive, a power battery 109 of an internal electric locomotive, or a power battery 109 of a fuel cell locomotive.

[0027] The input terminal of the first power conversion module 103 is connected to the first power interface component 101, the input terminal of the second power conversion module 104 is connected to the second power interface component 102, and the output terminals of the first power conversion module 103 and the second power conversion module 104 are respectively connected to the input terminal of the DC-DC conversion module 105.

[0028] The input terminals of each converter 107 are connected to the output terminals of the DC-DC conversion module 105, and the output terminals of each converter 107 are connected to their corresponding power supply interface components 106. Each power supply interface component 106 is used to connect externally to each traction motor 108 of a pure electric locomotive, each traction motor 108 of an internal electric locomotive, or each traction motor 108 of a hydrogen fuel cell locomotive.

[0029] When the first power interface component 101 is connected to a set of power batteries 109 of a pure electric locomotive or a hydrogen fuel cell 111 of a hydrogen fuel cell locomotive, the first power conversion module 103 corresponding to the first power interface component 101 performs chopping processing on the connected DC power; when the first power interface component 101 is connected to the main generator 110 of an internal electric locomotive, the first power conversion module 103 corresponding to the first power interface component 101 performs rectification processing on the connected AC power; and the second power conversion module 104 performs chopping processing on the connected DC power.

[0030] Specifically, the first power interface component 101 and the second power interface component 102 are two sets of power interface components for the multi-power source new energy locomotive power supply system 100. The first power interface component 101 and the second power interface component 102 may each include at least four external interfaces, so that the first power interface component 101 can be compatiblely connected to the hydrogen fuel cell 111 with positive and negative electrodes, the power battery 109 with two pairs of power supply electrodes, and the three-phase output main generator 110, and the second power interface component 102 can be connected to the power battery 109 with at least two pairs of power supply electrodes. For example, the first power interface component 101 and the second power interface component 102 in the system can each be provided in one or two sets; when both the first power interface component 101 and the second power interface component 102 are provided in one set, the number of corresponding power supply interface components 106 can be 4 to realize the power supply of the four-axle new energy locomotive; when both the first power interface component 101 and the second power interface component 102 are provided in two sets, more power devices can be connected to provide higher power supply, so the number of corresponding power supply interface components 106 can be 6 to realize the power supply of the six-axle new energy locomotive.

[0031] The first power conversion module 103 is a power conversion circuit corresponding to the first power interface component 101. It can convert the DC or AC power supplied to the first power interface component 101 into a suitable DC power and output it to the next-level DC conversion module 105. For example, the first power conversion module 103 can be a bridge circuit including multiple bridge arms, which can realize DC-to-DC step-up / step-down conversion on the one hand, and AC-to-DC rectification conversion on the other hand. Its working state can be adaptively converted according to the power type supplied to the corresponding first power interface component 101. The second power conversion module 104 is a power conversion circuit corresponding to the second power interface component 102. It can convert the DC power supplied to the second power interface component 102 into a suitable voltage level and output it to the next-level DC conversion module 105. For example, the second power conversion module 104 can be a bridge circuit including multiple bridge arms, which can realize DC-to-DC step-up / step-down conversion.

[0032] In some embodiments, the multi-power-source new energy locomotive power supply system 100 further includes at least one set of charging interface components 112, which are respectively connected to the output terminals of the first power conversion module 103 and the second power conversion module 104. The charging interface components 112 are used to connect an external charging power supply 113. When the charging interface components 112 are connected to an external charging power supply 113, the first power conversion module 103 and the second power conversion module 104 can also perform reverse DC power conversion from their output ports to their input ports, thereby realizing reverse charging of the power batteries 109 connected to the first power interface components 101 and the second power interface components 102. In addition, the system may also include other power conversion modules and corresponding external power supply interface components. Other power conversion modules can be located between the input terminal of the DC conversion module and the external power supply interface component, used for various power conversions such as step-up / step-down and / or rectification of the DC power output from the power conversion module. The external power supply interface component can connect to other electrical equipment on the locomotive, such as air conditioners, air compressors, and cooling fans, to realize new energy power supply for the entire vehicle.

[0033] The DC-DC conversion module 105 refers to the DC-DC conversion circuit located after the first power conversion module 103 and the second power conversion module 104, which can adjust the DC power output by the conversion module to an appropriate voltage level.

[0034] The inverter 107 refers to the inverter conversion circuit disposed between the DC conversion module 105 and the corresponding power supply interface component 106. It can convert the DC power output by the DC conversion module 105 into AC power to power the traction motor 108 connected to the corresponding power supply interface component 106. For example, the inverter 107 may include three bridge arms. Each bridge arm is provided with two on / off controllable switching devices. The connection point of the two switching devices on each bridge arm serves as the output terminal of the bridge arm and is connected to the corresponding interface in the corresponding power supply interface component 106.

[0035] The multi-power-source new energy locomotive power supply system provided in this embodiment, when the first power interface component is connected to a set of power batteries of a pure electric locomotive or a hydrogen fuel cell of a hydrogen fuel cell locomotive, the first power conversion module corresponding to the first power interface component performs chopping processing on the input DC power; when the first power interface component is connected to the main generator of an internal electric locomotive, the first power conversion module corresponding to the first power interface component performs rectification processing on the input AC power; the second power conversion module performs chopping processing on the input DC power, realizing the conversion of multiple power sources. The system can change the working state of the conversion module according to the corresponding power supply, so that the system can adapt to multiple power supply modes and broaden the applicability of the system.

[0036] Optionally, Figure 2This is a schematic diagram illustrating the connection relationship between a first power interface component and its corresponding first power conversion module, provided in an embodiment of the present invention. Based on the aforementioned embodiments, and in conjunction with... Figure 1 and Figure 2 The power battery 109 includes a first output terminal pair (including a positive electrode x+ and a negative electrode x-) and a second output terminal pair (including a positive electrode y+ and a negative electrode y-); the hydrogen fuel cell 111 includes a third output terminal pair (including a positive electrode z+ and a negative electrode z-); and the main generator 110 includes a first phase output terminal A, a second phase output terminal B, and a third phase output terminal C.

[0037] The first power interface assembly 101 includes a first interface a, a second interface b, a third interface c, and a fourth interface d. The first interface a and the second interface b are used to connect to the positive z+ and negative z- terminals of the third output terminal pair of the hydrogen fuel cell 111 corresponding to the first power interface assembly 101, respectively. The first interface a, the second interface b, and the third interface c are also used to connect to the first phase output terminal A, the second phase output terminal B, and the third phase output terminal C of the main generator 110 corresponding to the first power interface assembly 101, respectively. The first interface a, the second interface b, the third interface c, and the fourth interface d are also used to connect to the positive x+, the negative x-, the positive y+, and the negative y- terminals of the first output terminal pair of the power battery 109 corresponding to the first power interface assembly 101, respectively.

[0038] Correspondingly, the first power conversion module 103 includes a first state switching switch k1, a second state switching switch k2, a first bridge arm 201, a second bridge arm 202, and a third bridge arm 203; wherein, the input terminal m of the first bridge arm 201 is connected to the corresponding first interface a; the input terminal n of the second bridge arm 202 is connected to the corresponding second interface b via the first state switching switch k1; the input terminal p of the third bridge arm 203 is connected to the corresponding third interface c; the common anode point of each bridge arm is connected to the corresponding fourth interface d; and the second state switching switch k2 is disposed between the corresponding second interface b and the fourth interface d.

[0039] When the first power interface component 101 is connected to a set of power batteries 109 of a pure electric locomotive or a hydrogen fuel cell 111 of a hydrogen fuel cell locomotive, the first state switching switch k1 in the first power conversion module 103 corresponding to the first power interface component 101 is turned off and the second state switching switch k2 is turned on; when the first power interface component 101 is connected to the main generator 110 of an internal electric locomotive, the first state switching switch k1 in the first power conversion module 103 corresponding to the first power interface component 101 is turned on and the second state switching switch k2 is turned off.

[0040] Specifically, the power battery 109 is equipped with two sets of power output terminal pairs. Different power output terminal pairs can be connected to different battery strings in the battery to realize the output of two sets of DC power. When the system supplies power to the pure electric vehicle, the first power interface component 101 is connected to one set of power batteries 109 of the pure electric vehicle, the first state switching switch k1 is turned off and the second state switching switch k2 is turned on. In this configuration, the positive terminal x+ of the first output terminal pair of the power battery 109 is connected to the input terminal m of the first bridge arm 201 in the first power conversion module 103 via the first interface a of the first power interface assembly 101; the negative terminal x- of the first output terminal pair of the power battery 109 is connected to the common anode point of each bridge arm in the first power conversion module 103 via the second interface b and the second state switching switch k2 of the first power interface assembly 101; the positive terminal y+ of the second output terminal pair of the power battery 109 is connected to the input terminal p of the third bridge arm 203 in the first power conversion module 103 via the third interface c of the first power interface assembly 101; and the negative terminal y- of the second output terminal pair of the power battery 109 is connected to the common anode point of each bridge arm in the first power conversion module 103 via the fourth interface d of the first power interface assembly 101. The first power conversion module 103 can utilize the state switching of the switching devices on its first bridge arm 201 and third bridge arm 203 to achieve step-down conversion of the two sets of DC power supplies provided by the power battery 109, and output them to the subsequent DC conversion module for further voltage adaptation conversion.

[0041] The hydrogen fuel cell 111 is provided with at least one set of power output terminal pairs. Different power output terminal pairs can be connected to different battery reaction cells in the battery to realize at least one set of DC power output. For example, when the hydrogen fuel cell locomotive is a four-axle locomotive, the hydrogen fuel cell 111 can be provided with one set of power output terminal pairs to provide stable power to the traction motor 108 and / or the corresponding power battery 109; when the hydrogen fuel cell locomotive is a six-axle locomotive, the hydrogen fuel cell 111 can be provided with two sets of power output terminal pairs to provide higher power to the traction motor 108 and / or the corresponding power battery 109.

[0042] On one hand, exemplarily, the hydrogen fuel cell 111 is provided with only one set of third output terminal pairs. When the system supplies power to the hydrogen fuel cell locomotive, the first power interface component 101 is connected to the hydrogen fuel cell 111 of the hydrogen fuel cell locomotive, the first state switching switch k1 is turned off and the second state switching switch k2 is turned on. In this case, the positive terminal z+ of the third output terminal pair of the hydrogen fuel cell 111 is connected to the input terminal m of the first bridge arm 201 in the first power conversion module 103 via the first interface a of the first power interface component 101; the negative terminal z- of the third output terminal pair of the hydrogen fuel cell 111 is connected to the common anode point of each bridge arm in the first power conversion module 103 via the second interface b of the first power interface component 101 and the second state switching switch k2. The first power conversion module 103 can use the state switching of the switching devices on its first bridge arm 201 to realize the step-down conversion of the single set of DC power provided by the power battery 109, and output it to the subsequent DC conversion module for further voltage adaptation conversion.

[0043] On the other hand, exemplarily, in addition to a third output terminal pair, the hydrogen fuel cell 111 may also have a fourth output terminal pair (not shown in the figure). The connection relationship between the hydrogen fuel cell 111 with two terminal pairs and the first power interface assembly 101 is similar to that of the power battery 109. When the system supplies power to the hydrogen fuel cell vehicle, the first power interface assembly 101 is connected to the hydrogen fuel cell 111 of the hydrogen fuel cell vehicle, the first state switching switch k1 is turned off and the second state switching switch k2 is turned on. In this case, the positive terminal z+ of the third output terminal pair of the hydrogen fuel cell 111 is connected to the input terminal m of the first bridge arm 201 in the first power conversion module 103 via the first interface a of the first power interface assembly 101; the negative terminal z- of the third output terminal pair of the hydrogen fuel cell 111 is connected to the common anode point of each bridge arm in the first power conversion module 103 via the second interface b of the first power interface assembly 101 and the second state switching switch k2. The positive terminal of the fourth output terminal pair of the hydrogen fuel cell 111 is connected to the input terminal p of the third bridge arm 203 in the first power conversion module 103 via the third interface c of the first power interface assembly 101; the negative terminal of the fourth output terminal pair of the hydrogen fuel cell 111 is connected to the common anode point of each bridge arm in the first power conversion module 103 via the fourth interface d of the first power interface assembly 101. The first power conversion module 103 can utilize the state switching of the switching devices on its first bridge arm 201 and third bridge arm 203 to achieve step-down conversion of the two sets of DC power supplied by the power battery 109, and output it to the subsequent DC conversion module for further voltage adaptation conversion.

[0044] The main generator 110 is equipped with three power output terminals, each corresponding to a different phase of the power supply, thus enabling the output of three-phase AC power. When the system is supplying power to the internal locomotive, the first power interface component 101 is connected to the main generator of the internal locomotive, with the first state switching switch k1 turned on and the second state switching switch k2 turned off. In this case, the first phase output terminal A of the main generator 110 is connected to the input terminal m of the first bridge arm 201 in the first power conversion module 103 via the first interface a of the first power interface component 101; the second phase output terminal B of the main generator 110 is connected to the input terminal n of the second bridge arm 202 in the first power conversion module 103 via the second interface b of the first power interface component 101 and the first state switching switch k1; and the third phase output terminal C of the main generator 110 is connected to the input terminal p of the third bridge arm 203 in the first power conversion module 103 via the third interface c of the first power interface component 101. The first power conversion module 103 can use the state switching of the switching devices on its three bridge arms to realize the rectification and conversion of the AC power supplied by the main generator 110, and output it to the subsequent DC conversion module for further voltage adaptation and conversion.

[0045] In the multi-power-source new energy locomotive power supply system provided in this embodiment, when the first power interface component is connected to a set of power batteries of a pure electric locomotive or a hydrogen fuel cell of a hydrogen fuel cell locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned off and the second state switching switch is turned on; when the first power interface component is connected to the main generator of an internal electric locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned on and the second state switching switch is turned off. By switching the states of the two state switching switches in the first power conversion module, the first voltage conversion module is adapted to different power sources. Compared with the traditional method of setting different interface groups and conversion modules for different power sources, the control difficulty is low and the circuit structure is simple, which greatly reduces the operating cost and failure rate.

[0046] Optionally, Figure 3 This is a schematic diagram illustrating the connection relationship between a first power interface component, a second power interface component, and their corresponding conversion modules, provided in an embodiment of the present invention. Based on the aforementioned embodiments, and in conjunction with... Figure 1 and Figure 3The second power interface assembly 102 includes a fifth interface e, a sixth interface f, a seventh interface g, and an eighth interface h. The fifth interface e, sixth interface f, seventh interface g, and eighth interface h are used to connect one-to-one with the positive x+, negative x-, positive y+, and negative y- of the first output terminal pair of the power battery 109 corresponding to the second power interface assembly 102. The second power conversion module 104 includes a fifth bridge arm 301 and a sixth bridge arm 302; wherein the input terminal q of the fifth bridge arm 301 is connected to the corresponding fifth interface e; the input terminal r of the sixth bridge arm 302 is connected to the corresponding seventh interface g; and the common anode point of each bridge arm is connected to the corresponding sixth interface f and eighth interface h, respectively.

[0047] Specifically, the power battery 109 is equipped with two sets of power output terminal pairs. Different power output terminal pairs can be connected to different battery strings in the battery to realize the output of two sets of DC power. Regardless of whether the system powers a pure electric locomotive, a hydrogen fuel cell locomotive, or an internal electric locomotive, the second power interface component 102 is externally connected to one set of power batteries 109 of the locomotive. The first state switching switch k1 is off and the second state switching switch k2 is on. In this configuration, the positive terminal x+ of the first output terminal pair of the power battery 109 corresponding to the second power interface assembly 102 is connected to the input terminal q of the fifth bridge arm 301 in the second power conversion module 104 via the fifth interface e of the second power interface assembly 102; the negative terminal x- of the first output terminal pair of the power battery 109 corresponding to the second power interface assembly 102 is connected to the common anode point of each bridge arm in the second power conversion module 104 via the sixth interface f of the second power interface assembly 102; the positive terminal y+ of the second output terminal pair of the power battery 109 corresponding to the second power interface assembly 102 is connected to the input terminal r of the sixth bridge arm 302 in the second power conversion module 104 via the seventh interface g of the second power interface assembly 102; and the negative terminal y- of the second output terminal pair of the power battery 109 corresponding to the second power interface assembly 102 is connected to the common anode point of each bridge arm in the second power conversion module 104 via the eighth interface h of the second power interface assembly 102. The second power conversion module 104 can utilize the state switching of the switching devices on its fifth bridge arm 301 and sixth bridge arm 302 to realize the step-down conversion of the two sets of DC power supplied by the power battery 109 corresponding to the second power interface component 102, and output them to the subsequent DC conversion module for further voltage adaptation conversion.

[0048] For example, Figure 4 This is a schematic diagram illustrating the composition of another multi-power source new energy locomotive power supply system and its external related components proposed in this embodiment of the invention. For ease of understanding, Figure 4The gray lines indicate the circuits that remain off in the first power conversion module. Based on the aforementioned embodiment, refer to... Figure 4 The pure electric locomotive is a four-axle locomotive. The number of power supply interface components 106 and converters 107 is not less than 4; for example, the number of converters 107 and power supply interface components 106 can both be equal to 4. When the system supplies power to the four-axle pure electric locomotive, the first power interface component 101 is connected to one set of power batteries 109 of the four-axle pure electric locomotive, and the second power interface component 102 is connected to another set of power batteries 109 of the four-axle pure electric locomotive. The four power supply interface components 106 are connected one-to-one with the four traction motors 108 of the four-axle pure electric locomotive. The first state switching switch k1 in the first power conversion module 103 corresponding to the first power interface component 101 is turned off, and the second state switching switch k2 is turned on.

[0049] Figure 5 This is a schematic diagram illustrating the composition of another multi-power source new energy locomotive power supply system and its external related components proposed in this embodiment of the invention. For ease of understanding, Figure 5 The gray lines indicate the circuits that remain off in the first power conversion module. Based on the aforementioned embodiment, refer to... Figure 5 The internal locomotive is a four-axle locomotive. The number of power supply interface components 106 and converters 107 is not less than 4; for example, the number of converters 107 and power supply interface components 106 can both be equal to 4. When the system supplies power to the four-axle internal locomotive, the first power interface component 101 is externally connected to the main generator 110 of the four-axle internal locomotive, the second power interface component 102 is externally connected to the power battery 109 of the four-axle internal locomotive, the four power supply interface components 106 are connected one-to-one with the four traction motors 108 of the four-axle internal locomotive, and the first state switching switch k1 in the first power conversion module 103 corresponding to the first power interface component 101 is turned on while the second state switching switch k2 is turned off.

[0050] Figure 6 This is a schematic diagram illustrating the composition of another multi-power source new energy locomotive power supply system and its external related components proposed in this embodiment of the invention. For ease of understanding, Figure 6 The gray lines indicate the circuits that remain off in the first power conversion module. Based on the aforementioned embodiment, refer to... Figure 6All hydrogen fuel cell locomotives are four-axle locomotives. The number of power supply interface components 106 and converters 107 is not less than 4. When the system supplies power to the four-axle hydrogen fuel cell locomotive, the first power supply interface component 101 is externally connected to the hydrogen fuel cell 111 of the four-axle hydrogen fuel cell locomotive, the second power supply interface component 102 is externally connected to the power battery 109 of the four-axle hydrogen fuel cell locomotive, the four power supply interface components 106 are connected one-to-one with the four traction motors 108 of the four-axle hydrogen fuel cell locomotive, the first state switching switch k1 in the first power conversion module 103 corresponding to the first power supply interface component 101 is turned off while the second state switching switch k2 is turned on.

[0051] Figure 7 This is a schematic diagram illustrating the composition of another multi-power-source new energy locomotive power supply system and its external related components, as proposed in an embodiment of the present invention. Figure 7 The gray lines indicate the lines that remain off in the two first power conversion modules. Based on the aforementioned embodiment, refer to... Figure 7 The pure electric locomotive is a six-axle locomotive. Its power supply includes four sets of power batteries 109, and its power unit includes six sets of traction motors 108. The number of power supply interface components 106 and converters 107 is 6. The number of first power interface components 101 and second power interface components 102 are both 2. When the system supplies power to the six-axle pure electric locomotive, one first power interface component 101 is connected to the first set of power batteries 109 of the six-axle pure electric locomotive, one second power interface component 102 is connected to the second set of power batteries 109 of the six-axle pure electric locomotive, another first power interface component 101 is connected to the third set of power batteries 109 of the six-axle pure electric locomotive, another second power interface component 102 is connected to the fourth set of power batteries 109 of the six-axle pure electric locomotive, the six power supply interface components 106 are connected one-to-one with the six traction motors 108 of the six-axle pure electric locomotive, and the first state switching switches k1 in the first power conversion modules 103 corresponding to the two first power interface components 101 are both off while the second state switching switches k2 are both on.

[0052] Figure 8 This is a schematic diagram illustrating the composition of another multi-power-source new energy locomotive power supply system and its external related components, as proposed in an embodiment of the present invention. Figure 8 The gray lines indicate the lines that remain off in the two first power conversion modules and the idle second power conversion module. Based on the aforementioned embodiment, refer to... Figure 8The internal locomotive is a six-axle locomotive. The power supply of the six-axle internal locomotive includes two sets of power batteries 109 and one set of main generator 110. Its power unit includes six sets of traction motors 108. The number of power supply interface components 106 and converters 107 is 6. The number of first power interface components 101 and second power interface components 102 is 2 each. When the system supplies power to the six-axle internal electric locomotive, a first power interface component 101 is externally connected to the first set of power batteries 109 of the six-axle internal electric locomotive, a second power interface component 102 is externally connected to the second set of power batteries 109 of the six-axle internal electric locomotive, another first power interface component 101 is externally connected to the main generator 110 of the six-axle internal electric locomotive, six power interface components 106 are connected one-to-one with the six traction motors 108 of the six-axle internal electric locomotive, the first state switching switch k1 in the first power conversion module 103 corresponding to the first power interface component 101 externally connected to the first set of power batteries 109 of the six-axle internal electric locomotive is turned off while the second state switching switch k2 is turned on, and the first state switching switch k1 in the first power conversion module 103 corresponding to the first power interface component 101 externally connected to the main generator 110 of the six-axle internal electric locomotive is turned on while the second state switching switch k2 is turned off.

[0053] Figure 9 This is a schematic diagram illustrating the composition of another multi-power source new energy locomotive power supply system and its external related devices, as proposed in an embodiment of the present invention. Figure 9 The gray lines indicate the lines that remain off in the two first power conversion modules 103 and the idle second power conversion module. Based on the aforementioned embodiment, refer to... Figure 9The hydrogen fuel cell locomotive is a six-axle locomotive. Its power supply includes two sets of power batteries 109 and one set of hydrogen fuel cells 111. Its power unit includes six traction motors 108. The hydrogen fuel cell 111 of the six-axle locomotive is equipped with a third output terminal pair (including a positive terminal z+ and a negative terminal z-) and a fourth output terminal pair (including a positive terminal w+ and a negative terminal w-). The positive terminal of the fourth output terminal pair is connected to the third interface of the corresponding first power interface component 101, and the negative terminal is connected to the fourth interface of the corresponding first power interface component 101. The number of power supply interface components 106 and converters 107 is 6; the number of first power interface components 101 and second power interface components 102 is 2 each. When the system supplies power to the six-axle hydrogen fuel cell locomotive, a first power interface component 101 is externally connected to the first power battery 109 of the six-axle hydrogen fuel cell locomotive, a second power interface component 102 is externally connected to the second power battery 109 of the six-axle hydrogen fuel cell locomotive, another first power interface component 101 is externally connected to the hydrogen fuel cell 111 of the six-axle hydrogen fuel cell locomotive, six power interface components 106 are connected one-to-one with the six traction motors 108 of the six-axle hydrogen fuel cell locomotive, and the first state switching switches k1 in the first power conversion modules 103 corresponding to the two first power interface components 101 are both turned off while the second state switching switches k2 are both turned on.

[0054] In the multi-power-source new energy locomotive power supply system provided in this embodiment, the powered pure electric locomotives, internal electric locomotives, and hydrogen fuel cell locomotives are all four-axle or six-axle locomotives. When powering a four-axle locomotive, the number of power supply interface components and converters is no less than 4, and the number of sets of the first and second power supply interface components is no less than 1. Adaptive power conversion for four-axle locomotives using the three power supply modules is achieved by switching on and off two state switching switches in the first power conversion module corresponding to one first power supply interface component. When powering a six-axle locomotive, the number of power supply interface components and converters is no less than 6, and the number of sets of the first and second power supply interface components is no less than 2. Adaptive power conversion for six-axle locomotives using the three power supply modules is achieved by switching on and off state switching switches in the first power conversion modules corresponding to two first power supply interface components. This allows the system to adapt not only to locomotives with multiple power supply modes but also to locomotives with different numbers of axles, further broadening the system's applicability.

[0055] Optionally, Figure 10 The circuit diagrams of two first power interface components and their corresponding first power conversion modules provided in the embodiments of the present invention are based on the foregoing embodiments and combined with Figure 2 and Figure 10In two implementations, the first power conversion module 103 further includes a fourth bridge arm 1001, a first controllable switch k3, and a second controllable switch k4; the input terminals of the first bridge arm 201 and the second bridge arm 202 are connected via the first controllable switch k3, and the input terminals of the third bridge arm 203 and the fourth bridge arm 1001 are connected via the second controllable switch k4; the on / off states of the first controllable switch k3 and the second controllable switch k4 are the same as the states of the corresponding second state switching switches k2; and / or, in the first power conversion module 103, the number of first bridge arms 201, the number of second bridge arms 202, and the number of third bridge arms 203 are all greater than 1; the input terminals of each first bridge arm 201 are interconnected, the input terminals of each second bridge arm 202 are interconnected, and the input terminals of each third bridge arm 203 are interconnected.

[0056] Specifically, such as Figure 10 In the embodiment shown in the upper circuit diagram, when the first power interface assembly 101 is connected to the main generator 110 of the four-axle locomotive, the current input to each interface is generally small. The first controllable switch k3 and the second controllable switch k4 in the first power conversion module 103 can both be kept off. Each terminal of the main generator 110 is connected to the input terminal of one bridge arm, thus ensuring reliable current input. However, when the first power interface assembly 101 is connected to the power battery 109 or the hydrogen fuel cell 111 of the four-axle locomotive, the current input to its interface is larger. The first controllable switch k3 and the second controllable switch k4 in the first power conversion module 103 can both be kept on. Each positive terminal of the power supply is connected to the input terminals of at least two bridge arms, which greatly increases the current carrying capacity of the circuit and achieves stable current input. For example, the first controllable switch k3 and the second controllable switch k4 can be copper busbars with controllable on / off states. This circuit utilizes at least four bridge arms to achieve current shunting for each group of positive terminals, significantly improving the reliability of current transmission with minimal circuit cost.

[0057] like Figure 10 In the embodiment shown in the lower circuit diagram, regardless of the type of power supply device connected to the first power interface component 101, each phase or positive terminal of the power supply can be connected to the input terminals of two bridge arms, which greatly increases the current carrying capacity of the circuit and achieves stable current input. For example, the input terminals of the bridge arms can be connected via copper busbars. This circuit utilizes at least two bridge arms to achieve current shunting for each positive terminal and each phase, avoiding the use of controllable devices and reducing the control complexity of the circuit while improving the reliability of current transmission.

[0058] The system can use only Figure 10 A first power conversion module 103 is shown. When the system includes multiple first power conversion modules 103, the system can... Figure 10The two types of first power conversion modules 103 shown can be combined arbitrarily. For example, if the system includes two first power conversion modules 103, one of them can use the first power conversion module 103 shown in the upper scheme, and the other can use the first power conversion module 103 shown in the lower scheme.

[0059] Optionally, Figure 11 This invention provides a circuit diagram of a second power interface component and its corresponding second power conversion module, based on the aforementioned embodiments and in conjunction with... Figure 3 and Figure 11 In the second power conversion module, the number of fifth bridge arms 301 and sixth bridge arms 302 is greater than 1. The input terminals q of each fifth bridge arm 301 are interconnected and the input terminals r of each sixth bridge arm 302 are interconnected.

[0060] Specifically, the second power interface component 102 is used to connect an external power battery 109. Since the power battery 109 outputs a large current, the increased number of fifth and sixth bridge arms allows each positive terminal of the power battery 109 to be connected to the input terminals of two bridge arms, significantly increasing the circuit's current carrying capacity and achieving stable current connection. For example, the input terminals of similar bridge arms can be connected via copper busbars. This circuit utilizes at least four bridge arms to achieve current shunting for each positive terminal, avoiding the use of controllable devices and reducing circuit control complexity while improving current transmission reliability.

[0061] The multi-power-source new energy locomotive power supply system provided by this invention, when the first power interface component is connected to a set of power batteries of a pure electric locomotive or a hydrogen fuel cell of a hydrogen fuel cell locomotive, the first power conversion module corresponding to the first power interface component performs chopping processing on the input DC power; when the first power interface component is connected to the main generator of an internal electric locomotive, the first power conversion module corresponding to the first power interface component performs rectification processing on the input AC power; the second power conversion module performs chopping processing on the input DC power, realizing the conversion of multiple power sources. The system can change the working state of the conversion module according to the corresponding power supply, so that the system can adapt to multiple power supply modes and broaden the applicability of the system.

[0062] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A new energy locomotive power supply system with multiple power sources, characterized in that, include: The system comprises a first power interface component, a second power interface component, a first power conversion module corresponding to the first power interface component, a second power conversion module corresponding to the second power interface component, a DC-DC conversion module, at least four power interface components, and a converter corresponding to each of the power interface components. The first power interface component is used to connect an external power battery of a pure electric locomotive, the main generator of an internal electric locomotive, or the hydrogen fuel cell of a hydrogen fuel cell locomotive; the second power interface component is used to connect an external power battery of a pure electric locomotive, the power battery of an internal electric locomotive, or the power battery of a hydrogen fuel cell locomotive. The input terminal of the first power conversion module is connected to the first power interface component, the input terminal of the second power conversion module is connected to the second power interface component, and the output terminals of the first power conversion module and the second power conversion module are respectively connected to the input terminal of the DC-DC conversion module. The input terminals of each converter are connected to the output terminals of the DC-DC conversion module, and the output terminals of each converter are connected to their corresponding power supply interface components. Each power supply interface component is used to externally connect to each traction motor of the pure electric locomotive, each traction motor of the internal electric locomotive, or each traction motor of the hydrogen fuel cell locomotive. When the first power interface component is connected to a set of power batteries of the pure electric locomotive or a hydrogen fuel cell of the hydrogen fuel cell locomotive, the first power conversion module corresponding to the first power interface component performs chopping processing on the input DC power; when the first power interface component is connected to the main generator of the internal electric locomotive, the first power conversion module corresponding to the first power interface component performs rectification processing on the input AC power; and the second power conversion module performs chopping processing on the input DC power. Furthermore, the power battery includes a first output terminal pair and a second output terminal pair; the hydrogen fuel cell includes a third output terminal pair; and the main generator includes a first phase output terminal, a second phase output terminal, and a third phase output terminal. The first power interface assembly includes a first interface, a second interface, a third interface, and a fourth interface; the first interface and the second interface are used to connect to the positive and negative terminals of the third output terminal pair of the hydrogen fuel cell corresponding to the first power interface assembly, respectively; the first interface, the second interface, and the third interface are also used to connect to the first phase output terminal, the second phase output terminal, and the third phase output terminal of the main generator corresponding to the first power interface assembly, respectively; the first interface, the second interface, the third interface, and the fourth interface are also used to connect to the positive terminal of the first output terminal pair, the negative terminal of the first output terminal pair, the positive terminal of the second output terminal pair, and the negative terminal of the second output terminal pair of the power battery corresponding to the first power interface assembly, one-to-one; Correspondingly, the first power conversion module includes a first state switching switch, a second state switching switch, a first bridge arm, a second bridge arm, and a third bridge arm; wherein, the input terminal of the first bridge arm is connected to the corresponding first interface; the input terminal of the second bridge arm is connected to the corresponding second interface via the first state switching switch; the input terminal of the third bridge arm is connected to the corresponding third interface; the common anode point of each bridge arm is connected to the corresponding fourth interface; and the second state switching switch is disposed between the corresponding second interface and the fourth interface. When the first power interface component is connected to a set of power batteries of the pure electric locomotive or a hydrogen fuel cell of the hydrogen fuel cell locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned off and the second state switching switch is turned on; when the first power interface component is connected to the main generator of the internal electric locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned on and the second state switching switch is turned off.

2. The new energy locomotive power supply system with multiple power sources according to claim 1, characterized in that, The second power interface component includes a fifth interface, a sixth interface, a seventh interface, and an eighth interface; the fifth interface, the sixth interface, the seventh interface, and the eighth interface are used to connect one-to-one with the positive terminal of the first output terminal pair, the negative terminal of the first output terminal pair, the positive terminal of the second output terminal pair, and the negative terminal of the second output terminal pair of the power battery corresponding to the second power interface component; The second power conversion module includes a fifth bridge arm and a sixth bridge arm; wherein, the input terminal of the fifth bridge arm is connected to the corresponding fifth interface; the input terminal of the sixth bridge arm is connected to the corresponding seventh interface; and the common anode point of each bridge arm is connected to the corresponding sixth interface and the eighth interface, respectively.

3. The new energy locomotive power supply system with multiple power sources according to claim 2, characterized in that, The pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all four-axle locomotives; the number of the power supply interface components and the converters is not less than 4; When the system supplies power to the four-axle pure electric vehicle, the first power interface component is connected to one set of power batteries of the four-axle pure electric vehicle, the second power interface component is connected to another set of power batteries of the four-axle pure electric vehicle, and the four power interface components are connected to the four traction motors of the four-axle pure electric vehicle one by one. The first state switching switch in the first power conversion module corresponding to the first power interface component is turned off, and the second state switching switch is turned on.

4. The new energy locomotive power supply system with multiple power sources according to claim 2, characterized in that, The pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all four-axle locomotives; the number of the power supply interface components and the converters is not less than 4; When the system supplies power to the four-axle internal electric locomotive, the first power interface component is externally connected to the main generator of the four-axle internal electric locomotive, the second power interface component is externally connected to the power battery of the four-axle internal electric locomotive, the four power interface components are connected one-to-one with the four traction motors of the four-axle internal electric locomotive, and the first state switching switch in the first power conversion module corresponding to the first power interface component is turned on while the second state switching switch is turned off.

5. The new energy locomotive power supply system with multiple power sources according to claim 2, characterized in that, The pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all four-axle locomotives; the number of the power supply interface components and the converters is not less than 4; When the system supplies power to the four-axle hydrogen fuel cell locomotive, the first power interface component is externally connected to the hydrogen fuel cell of the four-axle hydrogen fuel cell locomotive, the second power interface component is externally connected to the power battery of the four-axle hydrogen fuel cell locomotive, the four power interface components are connected one-to-one with the four traction motors of the four-axle hydrogen fuel cell locomotive, the first state switching switch in the first power conversion module corresponding to the first power interface component is turned off while the second state switching switch is turned on.

6. The new energy locomotive power supply system with multiple power sources according to claim 2, characterized in that, The pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all six-axle locomotives; the number of the power supply interface assembly and the converter is 6; the number of the first power interface assembly and the second power interface assembly is 2 each; When the system supplies power to the six-axle pure electric vehicle, one of the first power interface components is connected to the first set of power batteries of the six-axle pure electric vehicle, one of the second power interface components is connected to the second set of power batteries of the six-axle pure electric vehicle, another of the first power interface components is connected to the third set of power batteries of the six-axle pure electric vehicle, another of the second power interface components is connected to the fourth set of power batteries of the six-axle pure electric vehicle, and the six power interface components are connected one-to-one with the six traction motors of the six-axle pure electric vehicle. The first state switching switches in the first power conversion modules corresponding to the two first power interface components are all turned off, while the second state switching switches are all turned on.

7. The new energy locomotive power supply system with multiple power sources according to claim 2, characterized in that, The pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all six-axle locomotives; the number of the power supply interface assembly and the converter is 6; the number of the first power interface assembly and the second power interface assembly is 2 each; When the system supplies power to the six-axle internal electric locomotive, one first power interface component is externally connected to the first set of power batteries of the six-axle internal electric locomotive, one second power interface component is externally connected to the second set of power batteries of the six-axle internal electric locomotive, another first power interface component is externally connected to the main generator of the six-axle internal electric locomotive, and the six power interface components are connected one-to-one with the six traction motors of the six-axle internal electric locomotive. The first state switching switch in the first power conversion module corresponding to the first power interface component externally connected to the first set of power batteries of the six-axle internal electric locomotive is turned off while the second state switching switch is turned on. In addition, the first state switching switch in the first power conversion module corresponding to the first power interface component externally connected to the main generator of the six-axle internal electric locomotive is turned on while the second state switching switch is turned off.

8. The new energy locomotive power supply system with multiple power sources according to claim 2, characterized in that, The pure electric locomotive, the internal electric locomotive, and the hydrogen fuel cell locomotive are all six-axle locomotives; the number of the power supply interface assembly and the converter is 6; the number of the first power interface assembly and the second power interface assembly is 2 each; When the system supplies power to the six-axle hydrogen fuel cell locomotive, one of the first power interface components is externally connected to the first set of power batteries of the six-axle hydrogen fuel cell locomotive, one of the second power interface components is externally connected to the second set of power batteries of the six-axle hydrogen fuel cell locomotive, another of the first power interface components is externally connected to the hydrogen fuel cell of the six-axle hydrogen fuel cell locomotive, the six power interface components are connected one-to-one with the six traction motors of the six-axle hydrogen fuel cell locomotive, and the first state switching switches in the first power conversion modules corresponding to the two first power interface components are both turned off while the second state switching switches are both turned on.

9. The new energy locomotive power supply system with multiple power sources according to any one of claims 1-8, characterized in that, The first power conversion module further includes a fourth bridge arm, a first controllable switch, and a second controllable switch; the input terminal of the first bridge arm is connected to the input terminal of the second bridge arm via the first controllable switch, and the input terminal of the third bridge arm is connected to the input terminal of the fourth bridge arm via the second controllable switch; the on / off states of the first controllable switch and the second controllable switch are the same as the states of the corresponding second state switching switches; And / or, in the first power conversion module, the number of the first bridge arms, the number of the second bridge arms, and the number of the third bridge arms are all greater than 1; the input terminals of each of the first bridge arms are interconnected, the input terminals of each of the second bridge arms are interconnected, and the input terminals of each of the third bridge arms are interconnected.

10. The new energy locomotive power supply system with multiple power sources according to any one of claims 2-8, characterized in that, In the second power conversion module, the number of the fifth bridge arm and the sixth bridge arm is greater than 1. The input terminals of each fifth bridge arm are interconnected and the input terminals of each sixth bridge arm are interconnected.

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