Hybrid power electric shunting locomotive converter and power supply and charging method

Abstract

The invention provides a hybrid power electric shunting locomotive converter which comprises two main and auxiliary charging circuits which are redundant to each other, and each main and auxiliary charging circuit comprises a plurality of pre-charging loops, two rectification bidirectional chopping modules, an intermediate DC loop, an inversion bidirectional chopping module and an inversion single-phase chopping module. And an isolation filtering module. Wherein a first port of each rectification bidirectional chopping module is externally connected with a traction transformer through a pre-charging loop, a second port is connected with an intermediate DC loop, and a third port is externally connected with a power battery pack through another pre-charging loop; a first port of the inversion bidirectional chopping module is connected with the intermediate DC loop, and a second port is externally connected with a motor; a first port of the inversion single-phase chopping module is connected with the intermediate DC loop, and a second port is connected with an external AC load or a locomotive garage power supply through the isolation filtering module. The converter is high in redundancy and reliability and comprehensive in function.

Description

Technical Field

[0001] The invention relates to a traction converter of an electric shunting locomotive, and in particular to a main-auxiliary-charging integrated traction converter suitable for a hybrid electric shunting locomotive. Background Art

[0002] At present, most domestic shunting locomotives are still diesel locomotives, which can realize the mobilization of locomotives and trailers in areas without electricity. However, with the continuous development of science and technology and the increasing business needs, shunting locomotives need to be transformed into electric locomotives and integrated with power battery packs to meet the mobilization tasks in both areas with electricity and areas without electricity.

[0003] In order to further respond to the national demand for energy conservation and environmental protection, electric locomotives with integrated power battery packs have been used in engineering vehicles and shunting in local railways or steel mills, but have not yet been used in the National Railway Corporation. According to the needs of the Railway Corporation, it is urgent to develop a high-reliability converter with integrated main and auxiliary charging to provide multiple functions such as traction power supply and power charging for electric locomotives with integrated power battery packs. Summary of the invention

[0004] In view of the above problems, the embodiments of the present invention provide a hybrid electric shunting locomotive converter and a locomotive power supply method and a locomotive charging method based on the hybrid electric shunting locomotive converter.

[0005] In a first aspect, an embodiment of the present invention provides a hybrid electric shunting locomotive converter, characterized in that it includes two main and auxiliary charging circuits, each of which includes multiple pre-charging circuits, two rectifier bidirectional chopper modules, an intermediate DC circuit, an inverter bidirectional chopper module and an inverter single-phase chopper module, and an isolation filter module, wherein:

[0006] The first port of each of the rectifier bidirectional chopper modules is externally connected to a traction transformer through one of the pre-charging circuits, the second port of each of the rectifier bidirectional chopper modules is connected to the intermediate DC circuit, and the third port of each of the rectifier bidirectional chopper modules is externally connected to a power battery pack through another of the pre-charging circuits;

[0007] The first port of the inverter bidirectional chopper module is connected to the intermediate DC circuit, and the second port of the inverter bidirectional chopper module is externally connected to the motor;

[0008] The first port of the inverter single-phase chopper module is connected to the intermediate DC circuit, the second port of the inverter single-phase chopper module is connected to the first port of the isolation filter module, and the second port of the isolation filter module is externally connected to an AC load or a locomotive garage power supply.

[0009] According to an embodiment of the present invention, in the above-mentioned hybrid electric shunting locomotive converter, the second ports of the inverter single-phase chopper modules in the two main and auxiliary charging circuits are connected through a first redundant contactor, and the first redundant contactor is configured so that when one of the inverter single-phase chopper modules in the two main and auxiliary charging circuits fails, the first redundant contactor is actuated so that the other inverter single-phase chopper module can simultaneously connect to the first ports of the isolation filter modules in the two main and auxiliary charging circuits to supply power to the AC loads of the two main and auxiliary charging circuits.

[0010] According to an embodiment of the present invention, in the above-mentioned hybrid electric shunting locomotive inverter, the second ports of the isolation filter modules in the two main and auxiliary charging circuits are connected through a second redundant contactor, and the second redundant contactor is configured so that when one of the isolation filter modules in the two main and auxiliary charging circuits fails, the second redundant contactor is actuated so that the other isolation filter module can simultaneously connect to the AC loads of the two main and auxiliary charging circuits to supply power to the AC loads of the two main and auxiliary charging circuits.

[0011] According to an embodiment of the present invention, in the hybrid electric shunting locomotive converter, each of the main and auxiliary charging circuits further includes a control unit, and each of the control units is connected to both the first redundant contactor and the second redundant contactor.

[0012] According to an embodiment of the present invention, in the above-mentioned hybrid electric shunting locomotive inverter, the second port of the isolation filter module in each of the main and auxiliary charging circuits is also provided with a voltage detection device, and each of the voltage detection devices is connected to the control units in the two main and auxiliary charging circuits.

[0013] According to an embodiment of the present invention, in the hybrid electric shunting locomotive converter, the third port of the inverter bidirectional chopper module in each of the main and auxiliary charging circuits is externally connected to another power battery pack through another pre-charging circuit.

[0014] According to an embodiment of the present invention, in the hybrid electric shunting locomotive converter, the third port of the inverter single-phase chopper module in each of the main and auxiliary charging circuits is externally connected to a braking resistor to absorb the braking energy fed back by the motor.

[0015] In a second aspect, an embodiment of the present invention provides a locomotive power supply method based on the hybrid electric shunting locomotive converter according to the first aspect, characterized in that it includes the following steps:

[0016] In the working mode of overhead line power supply, the single-phase AC voltage provided by the traction transformer is rectified into a target intermediate DC voltage by using the pre-charging circuit, the rectifying bidirectional chopping module and the intermediate DC circuit, the target intermediate DC voltage provided by the intermediate DC circuit is converted into a three-phase PWM voltage by using the inverting bidirectional chopping module, and the three-phase PWM voltage is provided to the motor, the target intermediate DC voltage provided by the intermediate DC circuit is converted into a sinusoidal AC voltage by using the inverting single-phase chopping module and the isolation filtering module, and the sinusoidal AC voltage is provided to the AC load, the target intermediate DC voltage provided by the intermediate DC circuit is DC-chopped by using the rectifying bidirectional chopping module and / or the inverting bidirectional chopping module, and the power battery pack is charged by using the chopped voltage;

[0017] In the working mode of power supply by the power battery pack, the pre-charging circuit, the rectifying bidirectional chopper module and the intermediate DC circuit are used to increase the voltage provided by the power battery pack to the target intermediate DC voltage, the inverter bidirectional chopper module is used to convert the target intermediate DC voltage provided by the intermediate DC circuit into a three-phase PWM voltage, and the three-phase PWM voltage is provided to the motor, the inverter single-phase chopper module and the isolation filter module are used to convert the target intermediate DC voltage provided by the intermediate DC circuit into a sinusoidal AC voltage, and the sinusoidal AC voltage is provided to the AC load.

[0018] According to an embodiment of the present invention, in the above two main and auxiliary charging circuits, each of the control units obtains the status of the first redundant contactor and the second redundant contactor, and controls the first redundant contactor and the second redundant contactor to operate.

[0019] According to an embodiment of the present invention, in the above-mentioned two main and auxiliary charging circuits, each control unit obtains the voltage signal collected by the voltage detection device in the two main and auxiliary charging circuits, and controls the voltage phase provided to the AC load by the main and auxiliary charging circuit in which it is located according to the voltage signal.

[0020] In a third aspect, an embodiment of the present invention provides a locomotive charging method based on the hybrid electric shunting locomotive converter according to the first aspect, characterized in that it comprises the following steps:

[0021] The AC voltage provided by the locomotive depot power supply is rectified into a target intermediate DC voltage by using the isolation filter module, the inverter single-phase chopper module and the intermediate DC circuit;

[0022] The target intermediate DC voltage provided by the intermediate DC circuit is DC-chopped by the rectifying bidirectional chopping module and / or the inverting bidirectional chopping module, and the power battery pack is charged by the chopped voltage.

[0023] Compared with the prior art, the above technical solution of the present invention has the following beneficial effects:

[0024] 1. The two main and auxiliary charging circuits of the hybrid electric shunting locomotive converter provided by the present invention are mutually redundant and have high redundancy and reliability;

[0025] 2. The hybrid electric shunting locomotive converter provided by the present invention has high integration, multiple interfaces, comprehensive functions and functional expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the circuit topology structure of the hybrid electric shunting locomotive converter provided by an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of a first redundant contactor 12 of an embodiment of the present invention connected to two control units via an intermediate control circuit;

[0029] Figure 3 It is a schematic diagram of the second redundant contactor 13 of the embodiment of the present invention connecting two control units through an intermediate control circuit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, this embodiment exemplarily shows an implementation form of the hybrid electric shunting locomotive converter provided by the present invention, and the specific description of its circuit topology structure is as follows.

[0032] The converter 15 has two main and auxiliary charging circuits (in fact, two relatively independent circuit topologies), wherein when a serious fault occurs in one of the two main and auxiliary charging circuits, the other main and auxiliary charging circuit can operate normally.

[0033] Each main and auxiliary charging circuit includes multiple pre-charging circuits 3, two rectifier bidirectional chopper modules 6 (integrating rectification and bidirectional chopping functions), an intermediate DC circuit 7 (composed of a capacitor), an inverter bidirectional chopper module 8 (integrating inverter and bidirectional chopping functions), an inverter single-phase chopper module 9 (integrating inverter and single-phase chopping functions), an isolation filter module 10 (composed of an isolation transformer and a three-phase filter capacitor), and an output contactor 11 and a voltage detection device 14.

[0034] In each main and auxiliary charging circuit, the first port of each rectifier bidirectional chopper module 6 is connected to the traction transformer 2 through a pre-charging circuit 3 to receive the single-phase AC voltage output by the traction transformer 2. The second port of each rectifier bidirectional chopper module 6 is connected to the intermediate DC circuit 7. The third port of each rectifier bidirectional chopper module 6 is connected to a power battery pack through another pre-charging circuit 3. The power battery pack is composed of a chopper reactor 4 and a power battery 5. The first port of the inverter bidirectional chopper module 8 is connected to the intermediate DC circuit 7, and the second port of the inverter bidirectional chopper module 8 is connected to the motor 17. The first port of the inverter single-phase chopper module 9 is connected to the intermediate DC circuit 7, and the second port of the inverter single-phase chopper module is connected to the first port of the isolation filter module 10 through the output contactor 11. The second port of the isolation filter module 10 is connected to the AC load or the locomotive depot power supply. At the same time, a voltage detection device 14 is provided on the second port of the isolation filter module 10.

[0035] A first redundant contactor 12 and a second redundant contactor 13 are also provided between the two main and auxiliary charging circuits, which are connected switch devices that can be shared by the two main and auxiliary charging circuits. Specifically, in the two main and auxiliary charging circuits, a first redundant contactor 12 is provided between the first ports of the two isolation filter modules 10. When the first redundant contactor 12 is closed, the first ports of the two isolation filter modules 10 are connected. A second redundant contactor 13 is provided between the second ports of the two isolation filter modules 10. When the second redundant contactor 13 is closed, the second ports of the two isolation filter modules 10 are connected.

[0036] In addition, each main and auxiliary charging circuit is also provided with a control unit. In addition to being connected to each module in its own main and auxiliary charging circuit, each control unit is also connected to a redundant contactor and a voltage detection device in another main and auxiliary charging circuit (not shown in detail in the figure).

[0037] The above-mentioned converter 15 can operate in the following three operating modes.

[0038] Working mode of overhead line power supply: main breaker 1 is closed, traction transformer 2 reduces the voltage of overhead line 25kV by transformation ratio, and outputs 4 single-phase AC voltages. Under the action of single-phase AC voltage, converter 15 first charges the capacitor in intermediate DC circuit 7 through pre-charging circuit 3, and then rectifies the single-phase AC voltage through rectification bidirectional chopper module 6 to rectify the single-phase AC voltage into target intermediate DC voltage. Inverter bidirectional chopper module 8 converts the target intermediate DC voltage into a three-phase PWM voltage and outputs the three-phase PWM voltage to the motor. Inverter single-phase chopper module 9 outputs another three-phase PWM voltage. Phase PWM voltage, the three-phase PWM voltage is converted into a sinusoidal voltage through the isolation filter module 10, and the sinusoidal voltage is output to the AC load; in addition, when the contact network is powered, the converter 15 can also simultaneously perform DC chopping through the rectifier bidirectional chopper module 6 and the inverter bidirectional chopper module 8, and provide the target intermediate DC power to the power battery 5 after stepping down through the chopper inductor 4 (with smoothing and freewheeling functions) to charge the power battery 5; in addition, when the locomotive is in a braking condition, the energy fed back by the motor 17 can be absorbed by the contact network, the power battery 5 and the braking resistor 16.

[0039] Working mode of power battery power supply: main breaker 1 is disconnected, and power is supplied by power battery 5. The converter first charges the capacitor in the intermediate DC circuit 7 through the pre-charging circuit 3, and then boosts the voltage of the power battery to the target intermediate DC voltage through the rectifier bidirectional chopper module 6. The inverter bidirectional chopper module 8 converts the target intermediate DC voltage into a three-phase PWM voltage and outputs the three-phase PWM voltage to the motor. The inverter single-phase chopper module 9 outputs another three-phase PWM voltage, which is converted into a sinusoidal voltage through the isolation filter module 10 and outputs the sinusoidal voltage to the AC load; in addition, when the locomotive is in a braking condition, the energy fed back by the motor 17 can be absorbed by the contact network, the power battery 5 and the braking resistor 16. Furthermore, in order to ensure that the power supply branches of each main and auxiliary charging circuit of the converter 15 consume the same amount of energy from the power battery 5 when the locomotive is in standby mode, the voltage detection device 14 (e.g., a voltage sensor) of each main and auxiliary charging circuit feeds back the collected voltage signal to the control units of the two main and auxiliary charging circuits at the same time. In other words, the voltage signal detected by each voltage detection device 14 needs to be fed back to the control unit 1 and the control unit 2 at the same time. The control unit 1 controls the phase of the voltage output by the main and auxiliary charging circuit where it is located according to the voltage signals detected by the two voltage detection devices 14, and the control unit 2 controls the phase of the voltage output by the main and auxiliary charging circuit where it is located according to the voltage signals detected by the two voltage detection devices 14, so that the phase of the voltage output by the two main and auxiliary charging circuits remains consistent, thereby realizing parallel power supply.

[0040] Working mode of garage power supply charging: The locomotive takes power from the three-phase AC power in the garage to charge the power battery. The main breaker 1 is disconnected, and the power battery 5 first establishes an intermediate DC voltage through the pre-charging circuit 3. The converter 15 then closes the output contactor 11. The three-phase AC voltage in the garage is first transformed by the isolation filter module 10, and then rectified by the inverter single-phase chopper module 9 to convert it into the target intermediate DC voltage. The target intermediate DC voltage is provided to the power battery 5 for charging after DC chopping and voltage reduction by the rectifier bidirectional chopper module 6 and the inverter bidirectional chopper module 8.

[0041] In addition, in order to improve the reliability of the operation of the converter 15, when the inverter single-phase chopper module 9 in a main and auxiliary charging circuit fails, the control unit can control the first redundant contactor 12 to operate (for example, close), so that the inverter single-phase chopper module 9 in the other main and auxiliary charging circuit can simultaneously connect to the first port of the isolation filter module 10 in the two main and auxiliary charging circuits to power the AC loads of the two main and auxiliary charging circuits.

[0042] In addition, in order to improve the reliability of the operation of the inverter 15, when an isolation filter module 10 in a main and auxiliary charging circuit fails, the control unit can control the second redundant contactor 13 to operate (for example, close), so that the isolation filter module 10 in the other main and auxiliary charging circuit can simultaneously connect to the AC loads of the two main and auxiliary charging circuits to supply power to the AC loads of the two main and auxiliary charging circuits.

[0043] In this way, it can be ensured that when a serious fault occurs in one of the two main and auxiliary charging circuits, the other main and auxiliary charging circuit can operate normally.

[0044] Furthermore, in order to avoid failure of the control unit, the first redundant contactor 12 / the second redundant contactor 13 of the converter 15 needs to be controlled via an intermediate control circuit (see Figure 2 and Figure 3 ) connects the control unit 1 and the control unit 2 of the two main and auxiliary charging circuits so that the two independent control units can obtain the state of the first redundant contactor 12 / the second redundant contactor 13 and control the action of the first redundant contactor 12 / the second redundant contactor 13. Figure 2 and Figure 3 In the intermediate control circuit, the converter 15 uses an intermediate relay to complete the driving, and the intermediate relay also plays an isolation role, so that the two control power supplies of the converter 15 are independent of each other.

[0045] In summary, the hybrid electric shunting locomotive converter 15 has the following high redundancy:

[0046] 1. The converter 15 has two relatively independent main and auxiliary charging circuits, wherein when any one of the main and auxiliary charging circuits fails, the other main and auxiliary charging circuit can still work normally;

[0047] 2. The converter 15 has four overhead line AC voltage input branches, wherein when any one overhead line AC voltage input branch fails, the other overhead line AC voltage input branches can still work normally;

[0048] 3. The converter 15 has six power battery branches, and when any one of the power battery branches fails, the other power battery branches can still work normally;

[0049] 4. The converter 15 has two auxiliary power supply output branches. When any one of the inverter single-phase chopper modules 9 fails, the first redundant contactor 12 can be closed to allow another inverter single-phase chopper module 9 to carry two auxiliary power supply output branches to supply power to the AC load; when any one of the isolation filter modules 10 fails, the second redundant contactor 13 can be closed to allow another isolation filter module 10 to carry two AC loads;

[0050] 5. The converter 15 has two control units, and when any one of the control units fails, the other control unit can still operate normally.

[0051] It should be noted that those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0052] The devices, equipment, systems, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a vehicle-mounted human-computer interaction device, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0053] Although the present invention provides method operation steps as described in the embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the device or terminal product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, in a parallel processor or multi-threaded processing environment, or even in a distributed data processing environment).

[0054] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0055] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0058] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, electronic device, and readable storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A hybrid electric shunting locomotive converter, characterized in that: It includes two main and auxiliary charging circuits, each of which includes multiple pre-charging circuits, two rectifier bidirectional chopper modules, an intermediate DC circuit, an inverter bidirectional chopper module, an inverter single-phase chopper module, and an isolation filter module, wherein: The first port of each of the rectifier bidirectional chopper modules is externally connected to a traction transformer through one of the pre-charging circuits, the second port of each of the rectifier bidirectional chopper modules is connected to the intermediate DC circuit, and the third port of each of the rectifier bidirectional chopper modules is externally connected to a power battery pack through another of the pre-charging circuits; The first port of the inverter bidirectional chopper module is connected to the intermediate DC circuit, and the second port of the inverter bidirectional chopper module is externally connected to the motor; The first port of the inverter single-phase chopper module is connected to the intermediate DC circuit, the second port of the inverter single-phase chopper module is connected to the first port of the isolation filter module, and the second port of the isolation filter module is externally connected to an AC load or a locomotive garage power supply.

2. The hybrid electric shunting locomotive converter according to claim 1, characterized in that: The second ports of the inverter single-phase chopper modules in the two main and auxiliary charging circuits are connected through a first redundant contactor. The first redundant contactor is configured such that when one of the inverter single-phase chopper modules in the two main and auxiliary charging circuits fails, the first redundant contactor is actuated so that the other inverter single-phase chopper module can simultaneously connect to the first ports of the isolation filter modules in the two main and auxiliary charging circuits to supply power to the AC loads of the two main and auxiliary charging circuits.

3. The hybrid electric shunting locomotive converter according to claim 2, characterized in that: The second ports of the isolation filter modules in the two main and auxiliary charging circuits are connected via a second redundant contactor, and the second redundant contactor is configured such that, when one of the isolation filter modules in the two main and auxiliary charging circuits fails, the second redundant contactor is actuated, so that the other isolation filter module can simultaneously connect to the AC loads of the two main and auxiliary charging circuits to supply power to the AC loads of the two main and auxiliary charging circuits.

4. The hybrid electric shunting locomotive converter according to claim 3, characterized in that: Each of the main and auxiliary charging circuits also includes a control unit, and each of the control units is connected to both the first redundant contactor and the second redundant contactor.

5. The hybrid electric shunting locomotive converter according to claim 4, characterized in that: The second port of the isolation filter module in each of the main and auxiliary charging circuits is also provided with a voltage detection device, and each of the voltage detection devices is connected to the control units in the two main and auxiliary charging circuits.

6. The hybrid electric shunting locomotive converter according to claim 1, characterized in that: The third port of the inverter bidirectional chopper module in each of the main and auxiliary charging circuits is externally connected to another power battery pack through another pre-charging circuit.

7. The hybrid electric shunting locomotive converter according to claim 1, characterized in that: The third port of the inverter single-phase chopper module in each of the main and auxiliary charging circuits is externally connected to a braking resistor to absorb the braking energy fed back by the motor.

8. A locomotive power supply method based on the hybrid electric shunting locomotive converter according to any one of claims 1 to 7, characterized in that: The following steps are involved: In the working mode of overhead line power supply, the single-phase AC voltage provided by the traction transformer is rectified into a target intermediate DC voltage by using the pre-charging circuit, the rectifying bidirectional chopping module and the intermediate DC circuit, the target intermediate DC voltage provided by the intermediate DC circuit is converted into a three-phase PWM voltage by using the inverting bidirectional chopping module, and the three-phase PWM voltage is provided to the motor, the target intermediate DC voltage provided by the intermediate DC circuit is converted into a sinusoidal AC voltage by using the inverting single-phase chopping module and the isolation filtering module, and the sinusoidal AC voltage is provided to the AC load, the target intermediate DC voltage provided by the intermediate DC circuit is DC-chopped by using the rectifying bidirectional chopping module and / or the inverting bidirectional chopping module, and the power battery pack is charged by using the chopped voltage; In the working mode of power supply by the power battery pack, the pre-charging circuit, the rectifying bidirectional chopper module and the intermediate DC circuit are used to increase the voltage provided by the power battery pack to the target intermediate DC voltage, the inverter bidirectional chopper module is used to convert the target intermediate DC voltage provided by the intermediate DC circuit into a three-phase PWM voltage, and the three-phase PWM voltage is provided to the motor, the inverter single-phase chopper module and the isolation filter module are used to convert the target intermediate DC voltage provided by the intermediate DC circuit into a sinusoidal AC voltage, and the sinusoidal AC voltage is provided to the AC load.

9. The locomotive power supply method according to claim 8, characterized in that: The following steps are involved: Each of the control units obtains the status of the first redundant contactor and the second redundant contactor, and controls the first redundant contactor and the second redundant contactor to operate; Each of the control units obtains voltage signals collected by voltage detection devices in the two main and auxiliary charging circuits, and controls the voltage phase provided to the AC load by the main and auxiliary charging circuits in which it is located according to the voltage signals.

10. A locomotive charging method based on the hybrid electric shunting locomotive converter according to any one of claims 1 to 7, characterized in that: The following steps are involved: The AC voltage provided by the locomotive depot power supply is rectified into a target intermediate DC voltage by using the isolation filter module, the inverter single-phase chopper module and the intermediate DC circuit; The target intermediate DC voltage provided by the intermediate DC circuit is DC-chopped by the rectifying bidirectional chopping module and / or the inverting bidirectional chopping module, and the power battery pack is charged by the chopped voltage.

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