A locomotive converter system and method integrating primary and auxiliary supply functions

Abstract

The present application relates to the field of locomotive converter technology, and particularly relates to a locomotive converter system and method with integrated main and auxiliary power supply functions, the system comprising an internal dual power source composed of a main transformer internal power source and a main generator internal power source, a DC bus module, and a main traction module, an auxiliary traction module and a train supply traction module, the system solving the problems of high manufacturing cost and low operation economic efficiency of the traditional heavy coupling traction locomotive converter system, and having an integrated dual power source locomotive converter with integrated traction, auxiliary power supply and train power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of locomotive converter technology, in particular to a locomotive conversion system and method integrating main and auxiliary power supply functions. BACKGROUND

[0002] Currently, main line locomotives are mainly divided into three types according to the traction mode, namely electric locomotive traction, diesel locomotive traction, and electric locomotive + diesel locomotive heavy-haul traction. Electric locomotive + diesel locomotive heavy-haul traction mainly solves the problem of mixed operation of electrified railways and non-electrified railways, and has self-rescue capability when the train power supply network is abnormal, which can be used in special scenarios with extremely high requirements for operation reliability. However, there are problems of high equipment manufacturing cost and low operation economy. The above structure has the problem of high equipment manufacturing cost and low operation economy of the traditional heavy-haul locomotive conversion system. SUMMARY

[0003] To solve the technical problem of low system energy efficiency based on the diesel generator set, for the topology structure demand scene of the traditional heavy-haul locomotive conversion system, the present application provides a locomotive conversion system and method integrating main and auxiliary power supply functions.

[0004] In a first aspect, the present application provides a locomotive conversion system integrating main and auxiliary power supply functions, comprising an internal dual-source power supply composed of a main transformer internal power supply and a main generator internal power supply, a DC bus module, and a main traction module, an auxiliary traction module, and a train supply traction module.

[0005] The output ends of each internal power supply including the main transformer internal power supply and the main generator internal power supply are connected in parallel and then connected to the DC bus module, for converging the DC power provided by each internal power supply through different power supply modes and then sending it to the DC bus module, wherein the different power supply modes include electric traction mode, diesel traction mode, and hybrid traction mode composed of electric traction mode and diesel traction mode.

[0006] The first output end of the DC bus module is connected to the main traction module, the main traction module includes a main power supply unit and a main traction unit, the first input end of the main power supply unit is connected to the input end of the main traction module, and the output end of the main power supply unit is connected to the main traction unit, for inverting the DC power provided by the DC bus module into AC power with main traction three-phase frequency modulation and amplitude modulation through the main power supply unit, to supply the main traction unit for operation.

[0007] The second output end of the direct current bus module is connected to an auxiliary traction module, the auxiliary traction module comprises an auxiliary power supply unit and a first auxiliary traction unit and a second auxiliary traction unit, the input end of the auxiliary power supply unit is connected to the input end of the auxiliary traction module, the first output end of the auxiliary power supply unit is connected to the first auxiliary traction unit, and the second output end of the auxiliary power supply unit is connected to the second auxiliary traction unit, so as to inversely convert the direct current provided by the direct current bus module into auxiliary traction three-phase frequency modulation amplitude modulation alternating current through the auxiliary traction unit, and supply the first auxiliary traction unit and the second auxiliary traction unit with power for operation;

[0008] The third output end of the direct current bus module is connected to a column traction module, the column traction module comprises a column power supply unit and a column traction unit, the input end of the column power supply unit is connected to the input end of the column traction module, and the output end of the column power supply unit is connected to the column traction unit, so as to convert the direct current provided by the direct current bus module into column direct current through the column traction unit, and supply the column traction unit with power for operation.

[0009] Preferably, the main transformer internal power supply comprises a main transformer, a first rectifier circuit, a second rectifier circuit and a third rectifier circuit.

[0010] The input end of the main transformer internal power supply is connected to a power grid, and the input stage of the main transformer is connected to the input end of the main transformer internal power supply.

[0011] The first traction winding of the main transformer is connected to the output end of the main transformer internal power supply through the first rectifier circuit, so as to convert the first single-phase alternating current provided by the first traction winding of the main transformer into first direct current power through the first rectifier circuit in the electric traction mode or the hybrid traction mode, and the first output end of the main transformer internal power supply outputs the first traction winding direct current.

[0012] The second traction winding of the main transformer is connected to the output end of the main transformer internal power supply through the second rectifier circuit, so as to convert the second single-phase alternating current provided by the second traction winding of the main transformer into second direct current power through the second rectifier circuit in the electric traction mode or the hybrid traction mode, and the second output end of the main transformer internal power supply outputs the second traction winding direct current.

[0013] The third traction winding of the main transformer is connected to the output end of the main transformer internal power supply through the third rectifier circuit, so as to convert the third single-phase alternating current provided by the third traction winding of the main transformer into third direct current power through the third rectifier circuit in the electric traction mode or the hybrid traction mode, and the third output end of the main transformer internal power supply outputs the third traction winding direct current.

[0014] The first output end, the second output end and the third output end of the main transformer internal power supply are connected to the DC bus module in parallel with each other.

[0015] Preferably, the first rectifier circuit comprises a first contactor, the first contactor forms a first variable current power supply circuit with the first traction winding of the main transformer and an input end of a first four-quadrant rectifier, an output end of the first four-quadrant rectifier is connected to an output end of the first rectifier circuit, and the first single-phase alternating current is converted into the first DC power supply through the first four-quadrant rectifier, so that the first DC power supply is output at the output end of the first rectifier circuit.

[0016] The second rectifier circuit comprises a second contactor, the second contactor forms a second variable current power supply circuit with the second traction winding of the main transformer and an input end of a second four-quadrant rectifier, an output end of the second four-quadrant rectifier is connected to an output end of the second rectifier circuit, and the second single-phase alternating current is converted into the second DC power supply through the second four-quadrant rectifier, so that the second DC power supply is output at the output end of the second rectifier circuit.

[0017] The third rectifier circuit comprises a third contactor, the third contactor forms a third variable current power supply circuit with the third traction winding of the main transformer and an input end of a third four-quadrant rectifier, an output end of the third four-quadrant rectifier is connected to an output end of the third rectifier circuit, and the third single-phase alternating current is converted into the third DC power supply through the third four-quadrant rectifier, so that the third DC power supply is output at the output end of the second rectifier circuit.

[0018] Preferably, the main generator internal power supply comprises a main generator and an internal combustion variable current circuit.

[0019] The output end of the main generator is connected to the output end of the main generator internal power supply through the internal combustion variable current circuit, and in the internal combustion traction mode or the hybrid traction mode, the internal combustion three-phase alternating current provided by the output end of the main generator is converted into the internal combustion DC power supply through the internal combustion variable current circuit, so that the internal combustion traction DC power supply is output at the output end of the main generator internal power supply.

[0020] The output end of the main generator internal power supply is connected to the first output end, the second output end and the third output end of the main transformer internal power supply in parallel with each other.

[0021] Preferably, the internal combustion variable current circuit comprises a three-phase line contactor, an input end of the three-phase line contactor is connected to an input end of the internal combustion variable current circuit, an output end of the three-phase line contactor is connected to an input end of a three-phase full-bridge rectifier, and an output end of the three-phase full-bridge rectifier is connected to an output end of the internal combustion variable current circuit, so that the internal combustion three-phase alternating current is converted into the internal combustion DC power supply through the three-phase full-bridge rectifier, and the internal combustion DC power supply is output at the output end of the internal combustion variable current circuit.

[0022] Preferably, comprising: the main power supply unit comprises a first main traction three-phase inverter, a second main traction three-phase inverter, and a third main traction three-phase inverter;

[0023] The input end of the first main traction three-phase inverter is connected to the input end of the main power supply unit, and the output end of the first main traction three-phase inverter is the first output end of the main power supply unit, for converting the direct current provided by the direct current bus module into first three-phase frequency-modulated and amplitude-modulated alternating current through the first main traction three-phase inverter, so that the first output end of the main power supply unit outputs the first main traction three-phase frequency-modulated and amplitude-modulated alternating current;

[0024] The input end of the second main traction three-phase inverter is connected to the input end of the main power supply unit, and the output end of the second main traction three-phase inverter is the second output end of the main power supply unit, for converting the direct current provided by the direct current bus module into second three-phase frequency-modulated and amplitude-modulated alternating current through the second main traction three-phase inverter, so that the second output end of the main power supply unit outputs the second main traction three-phase frequency-modulated and amplitude-modulated alternating current;

[0025] The input end of the third main traction three-phase inverter is connected to the input end of the main power supply unit, and the output end of the third main traction three-phase inverter is the third output end of the main power supply unit, for converting the direct current provided by the direct current bus module into third three-phase frequency-modulated and amplitude-modulated alternating current through the third main traction three-phase inverter, so that the third output end of the main power supply unit outputs the third main traction three-phase frequency-modulated and amplitude-modulated alternating current.

[0026] Preferably, comprising:

[0027] The first output end of the main power supply unit is connected to the first input end of the main traction unit;

[0028] The second output end of the main power supply unit is connected to the second input end of the main traction unit;

[0029] The third output end of the main power supply unit is connected to the third input end of the main traction unit;

[0030] The main traction unit comprises a first traction motor, a second traction motor, and a third traction motor;

[0031] The input end of the first traction motor is connected to the first input end of the main traction unit, for converting the first main traction three-phase frequency-modulated and amplitude-modulated alternating current provided by the main traction unit into power for the first traction motor to run;

[0032] The input end of the second traction motor is connected to the second input end of the main traction unit, for converting the second main traction three-phase frequency-modulated and amplitude-modulated alternating current provided by the main traction unit into power for the second traction motor to run;

[0033] The input end of the third traction motor is connected to the third input end of the main traction unit, for supplying the third main traction three-phase frequency modulation amplitude modulation alternating current provided by the main traction unit for the operation of the third traction motor.

[0034] Preferably, comprising:

[0035] The auxiliary power supply unit comprises an auxiliary power supply conditioning subunit, a first shunt inverter circuit, and a second shunt inverter circuit.

[0036] The input end of the auxiliary power supply conditioning subunit is connected to the input end of the auxiliary power supply unit.

[0037] The first output end of the auxiliary power supply unit is connected to the input end of the first shunt inverter circuit, and the output end of the first shunt inverter circuit is connected to the first output end of the auxiliary power supply unit, for generating a first shunt through the first shunt inverter circuit from the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit, so that the first auxiliary power supply shunt is output from the first output end of the auxiliary power supply unit.

[0038] The second output end of the auxiliary power supply unit is connected to the input end of the second shunt inverter circuit, and the output end of the second shunt inverter circuit is connected to the second output end of the auxiliary power supply unit, for generating a second shunt through the second shunt inverter circuit from the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit, so that the second auxiliary power supply shunt is output from the second output end of the auxiliary power supply unit.

[0039] Preferably, comprising:

[0040] The auxiliary power supply conditioning subunit comprises an auxiliary power supply voltage stabilizing circuit, an auxiliary power supply inverter circuit, and an auxiliary power supply rectifier circuit.

[0041] The input end of the auxiliary power supply voltage stabilizing circuit is connected to the input end of the auxiliary power supply conditioning subunit, the output end of the auxiliary power supply voltage stabilizing circuit is connected to the input end of the auxiliary power supply inverter circuit, the output end of the auxiliary power supply inverter circuit is connected to the input end of the auxiliary power supply rectifier circuit, and the output end of the auxiliary power supply rectifier circuit is connected to the output end of the auxiliary power supply conditioning subunit, for outputting auxiliary high-stable direct current through the corresponding voltage stabilization, inversion, and rectification of the auxiliary power supply voltage stabilizing circuit, the auxiliary power supply inverter circuit, and the auxiliary power supply rectifier circuit, so that the corresponding first shunt and second shunt are generated by the first shunt inverter circuit and the second shunt inverter circuit.

[0042] Preferably, comprising:

[0043] The column power supply unit comprises a column power supply voltage stabilizing circuit, a column power supply inverter circuit, and a column power supply rectifier circuit.

[0044] The input end of the column power supply voltage stabilizing circuit is connected to the input end of the column power supply unit, the output end of the column power supply voltage stabilizing circuit is connected to the input end of the column power supply inverter circuit, the output end of the column power supply inverter circuit is connected to the input end of the column power supply rectifier circuit, and the output end of the column power supply rectifier circuit is connected to the output end of the column power supply conditioning subunit, so as to generate column power supply high-stable direct current through the corresponding voltage stabilization, inversion and rectification of the column power supply voltage stabilizing circuit, the column power supply inverter circuit and the column power supply rectifier circuit, so as to output column direct current through the output end of the column power supply unit.

[0045] Preferably, comprising:

[0046] The main traction module further comprises a brake energy consumption unit, the input end of the brake energy consumption unit is connected to the fourth output end of the direct current bus module, and the brake energy consumption unit is used to consume the feedback electric energy of the main traction unit when the system cannot consume the feedback electric energy of the main traction unit during system braking.

[0047] Preferably, comprising:

[0048] The brake energy consumption unit comprises a chopper, the input end of the chopper is connected to the input end of the brake energy consumption unit, and the output end of the chopper is connected in series with an energy consumption network, wherein the energy consumption network comprises a resistance network composed of a plurality of energy consumption resistors, and the feedback electric energy input into the brake energy consumption unit is consumed through the on and off processing of the chopper and the energy consumption network.

[0049] Preferably, comprising:

[0050] The brake energy consumption unit is further used to consume the electric energy exceeding the predetermined threshold through the on and off processing of the chopper and the energy consumption network if the voltage of the direct current provided by the direct current bus module exceeds the predetermined threshold.

[0051] Preferably, comprising:

[0052] The direct current bus module further comprises a voltage stabilizing energy storage unit, the voltage stabilizing energy storage unit is connected in parallel with the input end of the direct current bus module, and the voltage stabilizing energy storage unit is used to consume the electric energy of the direct current provided by the direct current bus module exceeding the predetermined threshold.

[0053] Preferably, comprising: the voltage stabilizing energy storage unit comprises a resistance-capacitance network for consuming electric energy.

[0054] In another aspect, the application further provides a locomotive conversion method integrated with main and auxiliary power supply functions, comprising:

[0055] Based on the above-mentioned locomotive conversion system, the locomotive conversion method comprises:

[0056] The direct current provided by each internal power supply is converged through different power supply modes and then sent to a direct current bus module, wherein the different power supply modes include a power traction mode, an internal combustion traction mode, and a hybrid traction mode composed of the power traction mode and the internal combustion traction mode.

[0057] The direct current provided by the direct current bus module is inverted into three-phase frequency-modulated and amplitude-modulated alternating current by the main power supply unit, so as to drive the main traction unit to operate.

[0058] The direct current provided by the direct current bus module is inverted into three-phase frequency-modulated and amplitude-modulated alternating current by the auxiliary traction unit, so as to drive the first auxiliary traction unit and the second auxiliary traction unit to operate.

[0059] The direct current provided by the direct current bus module is converted into column-supplied direct current by the column-supplied traction unit, so as to drive the column-supplied traction unit to operate. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a topological structure diagram of an embodiment of the present application.

[0061] Figure 2 is a system structure diagram of an embodiment of the present application.

[0062] Figure 3 is an electrical schematic diagram of a four-quadrant rectifier of an embodiment of the present application.

[0063] Figure 4 is an electrical schematic diagram of a three-phase full-bridge rectifier of an embodiment of the present application.

[0064] Figure 5 is an electrical schematic diagram of a traction three-phase inverter of an embodiment of the present application.

[0065] Figure 6 is an electrical schematic diagram of a chopper of an embodiment of the present application.

[0066] Figure 7 is an electrical schematic diagram of an auxiliary power supply unit of an embodiment of the present application.

[0067] Figure 8 is an electrical schematic diagram of a column-supplied power supply unit of an embodiment of the present application.

[0068] Figure 9 is an electrical schematic diagram of parallel output of a main transformer internal power supply and a main generator internal power supply of another embodiment of the present application.

[0069] Figure 10 is an electrical schematic diagram of power frequency isolation of an auxiliary power supply unit and a column-supplied power supply unit of another embodiment of the present application. DETAILED DESCRIPTION

[0070] The application will be further described in connection with the following embodiments, but the scope of the application is not limited thereto.

[0071] Figure 1 is a block diagram of a power supply system according to an embodiment of the application. As shown in the figure, the locomotive conversion system according to the embodiment of the application comprises an internal dual-source power supply composed of a main transformer internal power supply A100 and a main generator internal power supply A110, a DC bus module A200, and a main traction module A300, an auxiliary traction module A310, and a train supply traction module A320. Figure 1

[0072] The output terminals of each internal power supply, including the main transformer internal power supply A100 and the main generator internal power supply A110, are connected in parallel to each other and then connected to the DC bus module A200, for converging the DC power provided by each internal power supply through different power supply modes and then sending the DC power into the DC bus module A200, wherein the different power supply modes include a power traction mode, an internal combustion traction mode, and a hybrid traction mode composed of the power traction mode and the internal combustion traction mode.

[0073] The first output terminal of the DC bus module A200 is connected to the main traction module A300, and the main traction module A300 comprises a main power supply unit A301 and a main traction unit A302. The first input terminal of the main power supply unit A301 is connected to the input terminal of the main traction module A300, and the output terminal of the main power supply unit A301 is connected to the main traction unit A302, for inverting the DC power provided by the DC bus module A200 into the main traction three-phase frequency-modulated and amplitude-modulated AC power through the main power supply unit A301, so as to drive the main traction unit A302 to operate.

[0074] The second output terminal of the DC bus module A200 is connected to the auxiliary traction module A310, and the auxiliary traction module A310 comprises an auxiliary power supply unit A311 and a first auxiliary traction unit A312 and a second auxiliary traction unit A313. The input terminal of the auxiliary power supply unit A311 is connected to the input terminal of the auxiliary traction module A310, the first output terminal of the auxiliary power supply unit A311 is connected to the first auxiliary traction unit A312, and the second output terminal of the auxiliary power supply unit A311 is connected to the second auxiliary traction unit A313, for inverting the DC power provided by the DC bus module A200 into the auxiliary traction three-phase frequency-modulated and amplitude-modulated AC power through the auxiliary traction unit, so as to drive the first auxiliary traction unit A312 and the second auxiliary traction unit A313 to operate.

[0075] ​The third output end of the direct current bus module A200 is connected to the column traction module A320, the column traction module A320 includes a column power supply unit A321 and a column traction unit A322, the input end of the column power supply unit A321 is connected to the input end of the column traction module A320, and the output end of the column power supply unit A321 is connected to the column traction unit A322, for converting the direct current provided by the direct current bus module A200 into column direct current through the column traction unit A322, so as to drive the column traction unit A322 to run.

[0076] According to one embodiment of the present application, as shown in Figure 2 The main transformer internal power supply A100 includes a main transformer T1001, a first rectifier circuit A1001, a second rectifier circuit A1002 and a third rectifier circuit A1003.

[0077] The input end of the main transformer internal power supply A100 is connected to the power grid, and the input stage of the main transformer T1001 is connected to the input end of the main transformer internal power supply A100.

[0078] The first traction winding of the main transformer T1001 is connected to the output end of the main transformer internal power supply A100 through the first rectifier circuit A1001, for converting the first single-phase alternating current provided by the first traction winding of the main transformer T1001 into first direct current power through the first rectifier circuit A1001 in the electric traction mode or the hybrid traction mode, so that the first output end of the main transformer internal power supply A100 outputs the first traction winding direct current.

[0079] The second traction winding of the main transformer T1001 is connected to the output end of the main transformer internal power supply A100 through the second rectifier circuit A1002, for converting the second single-phase alternating current provided by the second traction winding of the main transformer T1001 into second direct current power through the second rectifier circuit A1002 in the electric traction mode or the hybrid traction mode, so that the second output end of the main transformer internal power supply A100 outputs the second traction winding direct current.

[0080] The third traction winding of the main transformer T1001 is connected to the output end of the main transformer internal power supply A100 through the third rectifier circuit A1003, for converting the third single-phase alternating current provided by the third traction winding of the main transformer T1001 into third direct current power through the third rectifier circuit A1003 in the electric traction mode or the hybrid traction mode, so that the third output end of the main transformer internal power supply A100 outputs the third traction winding direct current.

[0081] The first output end, the second output end and the third output end of the main transformer internal power supply A100 are connected in parallel and then connected to the direct current bus module A200.

[0082] According to one embodiment of the present application, as shown in Figure 2 The first rectifier circuit comprises a first contactor K1001, which forms a first variable current power supply circuit with a first traction winding of a main transformer T1001 and an input end of a first four-quadrant rectifier AD1001, an output end of the first four-quadrant rectifier AD1001 is connected to an output end of the first rectifier circuit, for converting the first single-phase alternating current into a first direct current power through the first four-quadrant rectifier AD1001, so as to output the first direct current power from the output end of the first rectifier circuit.

[0083] The second rectifier circuit comprises a second contactor K1002, which forms a second variable current power supply circuit with a second traction winding of the main transformer T1001 and an input end of a second four-quadrant rectifier AD1002, an output end of the second four-quadrant rectifier AD1002 is connected to an output end of the second rectifier circuit, for converting the second single-phase alternating current into a second direct current power through the second four-quadrant rectifier AD1002, so as to output the second direct current power from the output end of the second rectifier circuit.

[0084] The third rectifier circuit comprises a third contactor K1003, which forms a third variable current power supply circuit with a third traction winding of the main transformer T1001 and an input end of a third four-quadrant rectifier AD1003, an output end of the third four-quadrant rectifier AD1003 is connected to an output end of the third rectifier circuit, for converting the third single-phase alternating current into a third direct current power through the third four-quadrant rectifier AD1003, so as to output the third direct current power from the output end of the second rectifier circuit.

[0085] According to one embodiment of the present application, as shown in Figure 2 The main generator internal power supply A110 comprises a main generator M1101 and an internal combustion variable current circuit A1101.

[0086] The output end of the main generator M1101 is connected to the output end of the main generator internal power supply A110 through the internal combustion variable current circuit A1101, for converting the internal combustion three-phase alternating current provided by the output end of the main generator M1101 into an internal combustion direct current power through the internal combustion variable current circuit A1101 in the internal combustion traction mode or the hybrid traction mode, so as to output the internal combustion traction direct current power from the output end of the main generator internal power supply A110.

[0087] The output end of the main generator internal power supply A110 is connected to the first output end, the second output end and the third output end of the main transformer internal power supply A100 in parallel, and then connected to a direct current bus module A200.

[0088] According to one embodiment of the present application, as shown inFigure 2 As shown in the figure, comprising: the internal combustion variable flow circuit A1101 includes a three-phase line contactor K1101, the input end of the three-phase line contactor K1101 is connected to the input end of the internal combustion variable flow circuit A1101, the output end of the three-phase line contactor K1101 is connected to the input end of the three-phase full-bridge rectifier AD1101, the output end of the three-phase full-bridge rectifier AD1101 is connected to the output end of the internal combustion variable flow circuit A1101, for converting the internal combustion three-phase alternating current into internal combustion direct current power through the three-phase full-bridge rectifier AD1101, so that the internal combustion variable flow circuit A1101 outputs the internal combustion direct current power.

[0089] According to one embodiment of the present application, as Figure 2 As shown in the figure, comprising: the main power supply unit A301 includes a first main traction three-phase inverter DA3001, a second main traction three-phase inverter DA3002, and a third main traction three-phase inverter DA3003.

[0090] The input end of the first main traction three-phase inverter DA3001 is connected to the input end of the main power supply unit A301, and the output end of the first main traction three-phase inverter DA3001 is the first output end of the main power supply unit A301, for converting the direct current provided by the direct current bus module A200 into the first three-phase frequency modulation amplitude modulation alternating current through the first main traction three-phase inverter DA3001, so that the first output end of the main power supply unit A301 outputs the first main traction three-phase frequency modulation amplitude modulation alternating current.

[0091] The input end of the second main traction three-phase inverter DA3002 is connected to the input end of the main power supply unit A301, and the output end of the second main traction three-phase inverter DA3002 is the second output end of the main power supply unit A301, for converting the direct current provided by the direct current bus module A200 into the second three-phase frequency modulation amplitude modulation alternating current through the second main traction three-phase inverter DA3002, so that the second output end of the main power supply unit A301 outputs the second main traction three-phase frequency modulation amplitude modulation alternating current.

[0092] The input end of the third main traction three-phase inverter DA3003 is connected to the input end of the main power supply unit A301, and the output end of the third main traction three-phase inverter DA3003 is the third output end of the main power supply unit A301, for converting the direct current provided by the direct current bus module A200 into the third three-phase frequency modulation amplitude modulation alternating current through the third main traction three-phase inverter DA3003, so that the third output end of the main power supply unit A301 outputs the third main traction three-phase frequency modulation amplitude modulation alternating current.

[0093] According to one embodiment of the present application, as Figure 2 As shown in the figure, comprising:

[0094] The first output end of the main power supply unit A301 is connected to the first input end of the main traction unit A302.

[0095] The second output end of the main power supply unit A301 is connected to the second input end of the main traction unit A302.

[0096] The third output end of the main power supply unit A301 is connected to the third input end of the main traction unit A302.

[0097] The main traction unit A302 comprises a first traction motor M3001, a second traction motor M3002, and a third traction motor M3003.

[0098] The input end of the first traction motor M3001 is connected to the first input end of the main traction unit A302, for supplying the first main traction three-phase frequency-modulated and amplitude-modulated alternating current provided by the main traction unit A302 to the first traction motor M3001 for operation.

[0099] The input end of the second traction motor M3002 is connected to the second input end of the main traction unit A302, for supplying the second main traction three-phase frequency-modulated and amplitude-modulated alternating current provided by the main traction unit A302 to the second traction motor M3002 for operation.

[0100] The input end of the third traction motor M3003 is connected to the third input end of the main traction unit A302, for supplying the third main traction three-phase frequency-modulated and amplitude-modulated alternating current provided by the main traction unit A302 to the third traction motor M3003 for operation.

[0101] According to one embodiment of the present application, as shown in Figure 2 comprises:

[0102] The auxiliary power supply unit A311 comprises an auxiliary power supply conditioning subunit A3111, a first shunt inverter circuit A3112, and a second shunt inverter circuit A3113.

[0103] The input end of the auxiliary power supply conditioning subunit A3111 is connected to the input end of the auxiliary power supply unit A311.

[0104] The first output end of the auxiliary power supply unit A311 is connected to the input end of the first shunt inverter circuit A3112, and the output end of the first shunt inverter circuit A3112 is connected to the first output end of the auxiliary power supply unit A311, for generating a first shunt through the first shunt inverter circuit A3112 from the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit A3111, so as to output a first auxiliary power supply shunt from the first output end of the auxiliary power supply unit A311.

[0105] The second output end of the auxiliary power supply unit A311 is connected to the input end of the second shunt inverter circuit A3113, the output end of the second shunt inverter circuit A3113 is connected to the second output end of the auxiliary power supply unit A311, and the second shunt is generated by the second shunt inverter circuit A3113 to supply the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit A3111, so that the second auxiliary power supply shunt is output from the second output end of the auxiliary power supply unit A311.

[0106] According to one embodiment of the present application, as shown in Figure 2 includes:

[0107] The auxiliary power supply conditioning subunit A3111 includes an auxiliary power supply voltage stabilizing circuit A31111, an auxiliary power supply inverter circuit A31112, and an auxiliary power supply rectifier circuit A31113.

[0108] The input end of the auxiliary power supply voltage stabilizing circuit A31111 is connected to the input end of the auxiliary power supply conditioning subunit A3111, the output end of the auxiliary power supply voltage stabilizing circuit A31111 is connected to the input end of the auxiliary power supply inverter circuit A31112, the output end of the auxiliary power supply inverter circuit A31112 is connected to the input end of the auxiliary power supply rectifier circuit A31113, and the output end of the auxiliary power supply rectifier circuit A31113 is connected to the output end of the auxiliary power supply conditioning subunit A3111. The auxiliary high-stable direct current is output by the auxiliary power supply voltage stabilizing circuit A31111, the auxiliary power supply inverter circuit A31112, and the auxiliary power supply rectifier circuit A31113 for corresponding voltage stabilization, inversion, and rectification, so that the first shunt and the second shunt are generated by the first shunt inverter circuit A3112 and the second shunt inverter circuit A3113.

[0109] According to one embodiment of the present application, as shown in Figure 2 includes:

[0110] The column power supply unit A321 includes a column power supply voltage stabilizing circuit A32111, a column power supply inverter circuit A32112, and a column power supply rectifier circuit A32113.

[0111] The input end of the column power supply voltage stabilization circuit A32111 is connected to the input end of the column power supply unit A321, the output end of the column power supply voltage stabilization circuit A32111 is connected to the input end of the column power supply inversion circuit A32112, the output end of the column power supply inversion circuit A32112 is connected to the input end of the column power supply rectification circuit A32113, and the output end of the column power supply rectification circuit A32113 is connected to the output end of the column power supply conditioning subunit, for generating column power supply high-stable direct current through the corresponding voltage stabilization, inversion and rectification of the column power supply voltage stabilization circuit A32111, the column power supply inversion circuit A32112 and the column power supply rectification circuit A32113, so as to output column direct current from the output end of the column power supply unit A321.

[0112] According to one embodiment of the present application, as shown in Figure 2 , comprising:

[0113] The main traction module A300 further comprises a brake energy consumption unit A303, the input end of the brake energy consumption unit A303 is connected to the fourth output end of the direct current bus module A200; for when the system brakes, if the system cannot consume the electric energy fed back by the main traction unit A302, the electric energy fed back by the main traction unit A302 is consumed through the brake energy consumption unit A303.

[0114] According to one embodiment of the present application, as shown in Figure 2 , comprising:

[0115] The brake energy consumption unit A303 comprises a chopper DD3031, the input end of the chopper DD3031 is connected to the input end of the brake energy consumption unit A303, and the output end of the chopper DD3031 is connected in series with an energy consumption network, wherein the energy consumption network comprises a resistance network composed of a plurality of choppers R3031, for consuming the electric energy fed back by the input end of the brake energy consumption unit A303 through the on and off processing of the chopper DD3031 and the energy consumption network.

[0116] According to one embodiment of the present application, as shown in Figure 2 , comprising:

[0117] The brake energy consumption unit A303 is further used for, if the voltage of the direct current provided by the direct current bus module A200 exceeds a predetermined threshold, consuming the electric energy exceeding the predetermined threshold through the on and off processing of the chopper DD3031 and the energy consumption network.

[0118] According to one embodiment of the present application, as shown in Figure 2 , comprising:

[0119] The DC bus module A200 further comprises a voltage-stabilizing energy storage unit A2101 connected in parallel to the input of the DC bus module A200, for consuming the electric energy of the DC power provided by the DC bus module A200 exceeding a predetermined threshold.

[0120] According to one embodiment of the present application, as shown in Figure 2 The voltage-stabilizing energy storage unit A2101 comprises a resistor-capacitor network RC2101 for consuming electric energy.

[0121] Meanwhile, the present application further provides a locomotive conversion method integrating main and auxiliary power supply functions, comprising:

[0122] Based on the above locomotive conversion system, the locomotive conversion method comprises:

[0123] The DC power provided by each internal power supply is converged through different power supply modes and then sent to the DC bus module A200, wherein the different power supply modes comprise electric traction mode, internal combustion traction mode, and hybrid traction mode composed of the electric traction mode and the internal combustion traction mode.

[0124] The DC power provided by the DC bus module A200 is inverted into main traction three-phase frequency-modulated and amplitude-modulated AC power by the main power supply unit A301, for operating the main traction unit A302.

[0125] The DC power provided by the DC bus module A200 is inverted into auxiliary traction three-phase frequency-modulated and amplitude-modulated AC power by the auxiliary traction unit, for operating the first auxiliary traction unit A312 and the second auxiliary traction unit A313.

[0126] The DC power provided by the DC bus module A200 is converted into column-supplied DC power by the column-supplied traction unit A322, for operating the column-supplied traction unit A322.

[0127] The working principle of the locomotive conversion system will be described below in combination with the embodiments shown in the drawings. Figure 1 , 2 The working principle of the locomotive conversion system will be described below in combination with the embodiments shown in the drawings.

[0128] As shown in Figure 1 , 2As shown, the locomotive converter system includes an internal dual power source composed of a main transformer internal power source and a main generator internal power source, a DC bus module, and a main traction module, an auxiliary traction module, and a train supply traction module; wherein the locomotive converter system adopts main auxiliary integrated power supply, that is, the converter integrates three-axis traction, two-way auxiliary power supply, and one-way train supply power supply, wherein the converter integrates three-axis traction, which includes the main traction module, and the main traction module includes a main power supply unit and a main traction unit, wherein the main traction unit includes a three-axis traction motor, the two-way auxiliary power supply includes an auxiliary power supply unit and a first auxiliary traction unit and a second auxiliary traction unit, and the one-way train supply power supply includes a train supply power supply unit and a train supply traction unit. Through the above structure, the integrated equipment of traction power supply, auxiliary power supply, and train supply power supply is realized. At the same time, the locomotive converter system adopts an internal dual power source, that is, a diesel mode full-bridge rectifier is connected to the converter intermediate DC loop, and specifically, it includes a power traction mode and a diesel traction mode, wherein the power traction mode is realized by the main transformer internal power source, and the diesel traction mode is realized by the main generator internal power source. At the same time, the hybrid traction mode of the power traction mode and the diesel traction mode is realized by the main transformer internal power source and the main generator internal power source. Finally, the output ends of each internal power source of the main transformer internal power source and the main generator internal power source are connected in parallel and then connected to the DC bus module. Through the above structure, the converter has the power traction, diesel traction, and hybrid traction capability. At the same time, the system realizes the miniaturization and light weight of the auxiliary converter and train supply, adopts a high-frequency auxiliary converter and train supply scheme, and greatly reduces the volume and weight compared with the traditional power frequency auxiliary converter and train supply. In summary, the dual power source locomotive increases the diesel generator based on the electric locomotive, so that a locomotive has three traction modes of power traction, diesel traction, and hybrid traction of power and diesel, has strong usability and high cost-effectiveness. Increasing the diesel generator will put higher requirements on the miniaturization and light weight of various devices of the locomotive. The system has an integrated dual power source locomotive converter that integrates traction, auxiliary power supply, and train power supply.

[0129] In summary, the dual power source locomotive scheme of the system is electric locomotive + diesel locomotive retraction, which has high operation efficiency. The system mainly solves the problems of light weight and miniaturization of the dual power source locomotive converter integrating power and diesel on the locomotive, so that the converter realizes power and diesel dual source driving, and a set of converter equipment provides complete traction power supply, auxiliary power supply, and train supply power supply functions by adopting a high-frequency auxiliary and train supply scheme.

[0130] The working principle of the locomotive converter system shown in the following Figure 1 , 2 embodiments will be described.

[0131] As Figure 1 , 2As shown in the figure, the main transformer internal power supply includes a main transformer, a first rectifier circuit, a second rectifier circuit and a third rectifier circuit; the input end of the main transformer internal power supply is connected to the power grid; the input stage of the main transformer is connected to the input end of the main transformer internal power supply; the first traction winding of the main transformer is connected to the output end of the main transformer internal power supply through the first rectifier circuit; the second traction winding of the main transformer is connected to the output end of the main transformer internal power supply through the second rectifier circuit; the third traction winding of the main transformer is connected to the output end of the main transformer internal power supply through the third rectifier circuit; the three traction windings of the main transformer in the electric traction mode are sequentially connected to the first four-quadrant rectifier, the second four-quadrant rectifier and the third four-quadrant rectifier through the first line contactor, the second line contactor and the third line contactor, respectively, to convert single-phase alternating current into direct current for the intermediate DC circuit of the converter; the first output end, the second output end and the third output end of the main transformer internal power supply are connected to the DC bus module in parallel; at the same time, when electric power and internal combustion are mixed, the main transformer and the main generator supply power to the converter at the same time; wherein the rectifier circuit includes a contactor, a four-quadrant rectifier and the like.

[0132] As shown in the figure, the first four-quadrant rectifier, the second four-quadrant rectifier and the third four-quadrant rectifier have the circuit principle as shown in the figure Figure 3 As shown in the figure, the first four-quadrant rectifier, the second four-quadrant rectifier and the third four-quadrant rectifier have the circuit principle as shown in the figure Figure 3 The IGBT is used as a switching device, and the pulse modulation control technology is used to control the output DC voltage of the rectifier to be stable, and by adjusting the pulse modulation angle, the alternating current and voltage on the traction working condition are made to be in the same phase, so that the power factor of the grid side is close to 1.0.

[0133] The main generator internal power supply includes a main generator and an internal combustion variable circuit; the output end of the main generator is connected to the output end of the main generator internal power supply through the internal combustion variable circuit, for converting the internal combustion three-phase alternating current provided by the output end of the main generator into internal combustion direct current through the first internal combustion variable circuit in the internal combustion traction mode or the mixed traction mode, so that the output end of the main generator internal power supply outputs internal combustion traction direct current; the three-phase alternating current output of the main generator in the internal combustion traction mode is connected to the three-phase full-bridge rectifier through the three-phase line contactor, to convert the three-phase alternating current into direct current for the intermediate DC circuit of the converter; at the same time, when electric power and internal combustion are mixed, the main transformer and the main generator supply power to the converter at the same time;

[0134] The output end of the main generator internal power supply and the first output end, the second output end and the third output end of the main transformer internal power supply are connected to the DC bus module in parallel; the first rectifier, the second rectifier, the third rectifier and the fourth rectifier are used to convert alternating current into direct current for the intermediate DC circuit of the converter.

[0135] As shown in the figure, the first four-quadrant rectifier, the second four-quadrant rectifier and the third four-quadrant rectifier have the circuit principle as shown in the figure Figure 4 As shown in the figure, the first four-quadrant rectifier, the second four-quadrant rectifier and the third four-quadrant rectifier have the circuit principle as shown in the figureFigure 4 As shown, using rectifier tube as switching device, through three-phase full-bridge rectifier, three-phase AC output of main generator is converted into DC output.

[0136] The working principle of the locomotive conversion system shown in the following embodiments will be described. Figure 1 、 2 The working principle of the locomotive conversion system shown in the following embodiments will be described.

[0137] As Figure 1 、 2 shown, the main power supply unit includes a first main traction three-phase inverter, a second main traction three-phase inverter, and a third main traction three-phase inverter; the input end of the first main traction three-phase inverter is connected to the input end of the main power supply unit, and the output end of the first main traction three-phase inverter is the first output end of the main power supply unit; the input end of the second main traction three-phase inverter is connected to the input end of the main power supply unit, and the output end of the second main traction three-phase inverter is the second output end of the main power supply unit; the input end of the third main traction three-phase inverter is connected to the input end of the main power supply unit, and the output end of the third main traction three-phase inverter is the third output end of the main power supply unit; the main traction unit includes a first traction motor, a second traction motor, and a third traction motor; through the above circuit structure, such as the first traction inverter, the second traction inverter, and the third traction inverter, DC power is converted into three-phase AC power with adjustable frequency and amplitude to control the torque output of the first traction motor, the second traction motor, and the third traction motor.

[0138] As Figure 5 shown, the circuit principle of the first traction inverter, the second traction inverter circuit, and the third traction inverter is as shown in Figure 5 As shown, using IGBT as switching device, DC power in the intermediate DC loop of the converter is inverted into three-phase AC output with adjustable frequency and voltage to drive the traction motor, and each traction motor corresponds to a traction inverter.

[0139] The auxiliary power supply unit comprises an auxiliary power supply conditioning subunit, a first shunt inverter circuit and a second shunt inverter circuit; the input end of the auxiliary power supply conditioning subunit is connected to the input end of the auxiliary power supply unit; the first output end of the auxiliary power supply unit is connected to the input end of the first shunt inverter circuit, and the output end of the first shunt inverter circuit is connected to the first output end of the auxiliary power supply unit; the second output end of the auxiliary power supply unit is connected to the input end of the second shunt inverter circuit, and the output end of the second shunt inverter circuit is connected to the second output end of the auxiliary power supply unit; the auxiliary power supply conditioning subunit comprises an auxiliary power supply voltage stabilizing circuit, an auxiliary power supply inverter circuit and an auxiliary power supply rectifier circuit; through the above circuit structure, the auxiliary converter takes power from the converter intermediate DC loop, and through the links of voltage stabilization, inversion, isolation and rectification, etc., two paths of 3AC\380V auxiliary output are inversely converted, one of which is a sine output through LC filtering to provide power for the locomotive auxiliary equipment, and the other is a quasi-sine wave directly output to provide power for the main generator cooling fan for cooling the main generator.

[0140] As shown in Figure 7 The auxiliary converter takes power from the converter intermediate DC loop, a stable voltage output is obtained through two-stage series connection of the voltage stabilizing circuit to the inverter circuit, and the purpose of two-stage series connection is to reduce the voltage stress of the switching device. The LLC resonant conversion circuit enables the IGBT element of the inverter circuit on the primary side of the transformer to realize zero-voltage turn-on and small-current turn-off, and the rectifier tube of the full-bridge rectifier on the secondary side to realize zero-current switching, thereby reducing the current stress and loss of the switching device and realizing high switching frequency application; the full-bridge rectifier provides a stable DC voltage to the inverter, and the output of the inverter is filtered through a three-phase LC filter to output 3AC\380V sine wave to the locomotive auxiliary equipment as the first auxiliary traction unit, and the inverter 24 outputs 3AC380V quasi-sine wave to the main generator cooling fan as the second auxiliary traction unit.

[0141] The column power supply unit comprises a column power supply voltage stabilizing circuit, a column power supply inverter circuit and a column power supply rectifier circuit; the input end of the column power supply voltage stabilizing circuit is connected to the input end of the column power supply unit, the output end of the column power supply voltage stabilizing circuit is connected to the input end of the column power supply inverter circuit, the output end of the column power supply inverter circuit is connected to the input end of the column power supply rectifier circuit, and the output end of the column power supply rectifier circuit is connected to the output end of the column power supply conditioning subunit; the column converter also takes power from the converter intermediate DC loop, and through the links of voltage stabilization, inversion, isolation and rectification, etc., outputs DC600V to the passenger train mounted on the rear end of the locomotive for power supply, and if it is a traction truck, the column converter can be omitted or cancelled;

[0142] As shown in Figure 8As shown, the column supply front-end voltage stabilizing circuit, high-frequency inverter circuit, LLC resonant circuit, full-bridge rectifier circuit and auxiliary converter have the same working principle, and the LC filter circuit makes the column supply output stable DC 600V DC for passenger trains.

[0143] The working principle of the locomotive conversion system shown in the following Figure 1 、 2 embodiments will be described.

[0144] As shown in Figure 1 、 2 , the main traction module further comprises a brake energy consumption unit, the input end of the brake energy consumption unit is connected to the fourth output end of the DC bus module; for when the system brakes, if the system cannot consume the power feedback by the main traction unit, the brake energy consumption unit is used to consume the power feedback by the main traction unit; the brake energy consumption unit comprises a chopper, the input end of the chopper is connected to the input end of the brake energy consumption unit, and the output end of the chopper is connected in series with an energy consumption network, wherein the energy consumption network comprises a resistor network composed of a plurality of energy consumption resistors, and is used to consume the power feedback by the brake energy consumption unit through the on and off processing of the chopper and the energy consumption network; based on the above structure, the chopper controls the on and off of the brake resistor; when the locomotive brakes, the traction motor is converted into a generator state, and through the first main inverter, the second main inverter and the third main inverter, the DC power is converted into an intermediate DC circuit, and when the overhead power supply is working, the first four-quadrant rectifier, the second four-quadrant rectifier and the third four-quadrant rectifier are used to convert the AC power into AC power and feed it back to the power grid, and when the overhead power supply is not working, the chopper is used to connect the chopper resistor to consume the power.

[0145] As shown in Figure 6 , the principle of the chopper circuit is shown in Figure 6 , the upper tube uses IGBT as a switching device to control the conduction and off of the brake resistor, and the lower tube uses a rectifier tube to continue the current.

[0146] The brake energy consumption unit is also used to consume the power exceeding the predetermined threshold value through the on and off processing of the chopper and the energy consumption network when the DC voltage provided by the DC bus module exceeds the predetermined threshold value; in addition, when the converter works in the traction mode, if the voltage of the intermediate DC circuit exceeds the set value, the brake resistor can be connected by the chopper to quickly consume the excess energy and suppress the overvoltage of the intermediate DC circuit.

[0147] The working principle of the locomotive conversion system shown in the following Figure 1 、 2 embodiments will be described.

[0148] As shown in Figure 1 ,2 As shown, the DC bus module further comprises a voltage stabilizing and energy storing unit connected in parallel to the input end of the DC bus module, for consuming the electric energy of the DC power provided by the DC bus module exceeding the predetermined threshold; the voltage stabilizing and energy storing unit comprises a resistance-capacitance network for consuming electric energy; based on the above structure, the intermediate DC circuit (DC bus module) of the converter is generally composed of a DC voltage stabilizing and energy storing unit formed by a plurality of power capacitors connected in series and in parallel, and a fixed discharge resistor is generally connected in parallel, which is used to consume the energy stored in the intermediate DC circuit capacitor when the converter fails to quickly discharge the energy.

[0149] As shown in Figure 9 As an alternative solution, the three-phase AC power output by the main generator can also be converted into DC power for the intermediate DC circuit of the converter by using the IGBT anti-parallel diode of the four-quadrant converter of the converter to perform full-bridge rectification, which has the advantage of saving a three-phase full-bridge rectifier.

[0150] As shown in Figure 10 The auxiliary converter and the column supply converter can also use a power frequency isolation scheme. The traditional method is to integrate the inverter module and the converter, and then install the auxiliary transformer and the filter in the auxiliary filter cabinet, and install the column supply transformer, the rectifier and the filter in the column supply distribution cabinet. Multiple sets of equipment are required to work together, and the system occupies a large space size and weight. The working principle of the present solution is simple and has good isolation effect.

[0151] The specific working steps of the locomotive conversion system shown in the following embodiments will be described.

[0152] Based on the above-mentioned locomotive conversion system, the locomotive conversion method comprises:

[0153] The DC power provided by each internal power supply is sent to the DC bus module after being converged by different power supply modes, wherein the different power supply modes include electric traction mode, internal combustion traction mode, and hybrid traction mode composed of electric traction mode and internal combustion traction mode;

[0154] The DC power provided by the DC bus module is inverted into three-phase frequency-modulated and amplitude-modulated AC power by the main power supply unit, for the operation of the main traction unit;

[0155] The DC power provided by the DC bus module is inverted into three-phase frequency-modulated and amplitude-modulated AC power by the auxiliary traction unit, for the operation of the first auxiliary traction unit and the second auxiliary traction unit;

[0156] for converting the DC power provided by the DC bus module into column supply DC power by the column supply traction unit, for the operation of the column supply traction unit.

[0157] The topology of the scheme combines the above steps to form a locomotive conversion method, the conversion method has strong availability and high cost-effectiveness, and finally forms an integrated dual-source locomotive converter through the method.

[0158] Each embodiment in the present application is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0159] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0160] The protection scope of the present application is not limited to the above-mentioned embodiments, and obviously, those skilled in the art can make various modifications and changes to the present application without departing from the scope and spirit of the present application. If these modifications and changes belong to the scope of the claims of the present application and its equivalent technologies, the intention of the present application also includes these modifications and changes.

Claims

1. A locomotive converter system integrating main and auxiliary power supply functions, characterized in that, It includes an internal dual-source power supply consisting of the power supply inside the main transformer and the power supply inside the main generator, a DC bus module, as well as a main traction module, an auxiliary traction module, and a train power supply traction module; The output terminals of each internal power source, including the power source inside the main transformer and the power source inside the main generator, are connected in parallel to each other and then connected to the DC bus module. This is used to combine the DC power provided by each internal power source through different power supply modes and send it to the DC bus module. The different power supply modes include electric traction mode, internal combustion traction mode, and a hybrid traction mode composed of electric traction mode and internal combustion traction mode. The first output terminal of the DC bus module is connected to the main traction module. The main traction module includes a main power supply unit and a main traction unit. The first input terminal of the main power supply unit is connected to the input terminal of the main traction module, and the output terminal of the main power supply unit is connected to the main traction unit. The main power supply unit is used to invert the DC power provided by the DC bus module into three-phase frequency-modulated and amplitude-modulated AC power for the main traction unit to operate. The second output terminal of the DC bus module is connected to the auxiliary traction module. The auxiliary traction module includes an auxiliary power supply unit, a first auxiliary traction unit, and a second auxiliary traction unit. The input terminal of the auxiliary power supply unit is connected to the input terminal of the auxiliary traction module. The first output terminal of the auxiliary power supply unit is connected to the first auxiliary traction unit, and its second output terminal is connected to the second auxiliary traction unit. It is used to invert the DC power provided by the DC bus module into three-phase frequency-modulated and amplitude-modulated AC power for auxiliary traction through the auxiliary traction unit, so as to power the first and second auxiliary traction units. The auxiliary power supply unit includes an auxiliary power supply conditioning subunit, a first shunt inverter circuit, and a second shunt inverter circuit. The input terminal of the auxiliary power supply conditioning subunit is connected to the input terminal of the auxiliary power supply unit; The first output terminal of the auxiliary power supply unit is connected to the input terminal of the first shunt inverter circuit, and the output terminal of the first shunt inverter circuit is connected to the first output terminal of the auxiliary power supply unit. The auxiliary high-stability DC power provided by the auxiliary power supply conditioning subunit is used to generate a first shunt through the first shunt inverter circuit so that the first output terminal of the auxiliary power supply unit can output the first auxiliary power supply shunt. The second output terminal of the auxiliary power supply unit is connected to the input terminal of the second shunt inverter circuit, and the output terminal of the second shunt inverter circuit is connected to the second output terminal of the auxiliary power supply unit. It is used to generate a second shunt through the second shunt inverter circuit from the auxiliary high-stability DC power provided by the auxiliary power supply conditioning subunit, so as to output the second auxiliary power supply shunt at the second output terminal of the auxiliary power supply unit. The third output terminal of the DC bus module is connected to the train power supply and traction module. The train power supply and traction module includes a train power supply unit and a train power supply and traction unit. The input terminal of the train power supply unit is connected to the input terminal of the train power supply and traction module, and the output terminal of the train power supply unit is connected to the train power supply and traction unit. It is used to convert the DC power provided by the DC bus module into train power supply DC power through the train power supply and traction unit for the operation of the train power supply and traction unit.

2. The locomotive converter system according to claim 1, characterized in that, The power supply inside the main transformer includes the main transformer, a first rectifier circuit, a second rectifier circuit, and a third rectifier circuit; The power input terminal of the main transformer is connected to the power grid; the input stage of the main transformer is connected to the power input terminal of the main transformer. The first traction winding of the main transformer is connected to the output terminal of the power supply inside the main transformer through the first rectifier circuit. It is used to convert the first single-phase AC power provided by the first traction winding of the main transformer into the first DC power supply through the first rectifier circuit in electric traction mode or hybrid traction mode, so as to output the first traction winding DC power from the first output terminal of the power supply inside the main transformer. The second traction winding of the main transformer is connected to the output terminal of the power supply inside the main transformer through the second rectifier circuit. It is used to convert the second single-phase AC power provided by the second traction winding of the main transformer into the second DC power supply through the second rectifier circuit in the electric traction mode or the hybrid traction mode, so as to output the second traction winding DC power from the second output terminal of the power supply inside the main transformer. The third traction winding of the main transformer is connected to the output terminal of the power supply inside the main transformer through the third rectifier circuit. It is used to convert the third single-phase AC power provided by the third traction winding of the main transformer into the third DC power supply through the third rectifier circuit in the electric traction mode or the hybrid traction mode, so as to output the DC power of the third traction winding from the third output terminal of the power supply inside the main transformer. The first, second, and third output terminals of the power supply inside the main transformer are connected in parallel to each other and then connected to the DC bus module.

3. The locomotive converter system according to claim 2, characterized in that, The first rectifier circuit includes a first contactor. The first contactor, together with the first traction winding of the main transformer and the input terminal of the first four-quadrant rectifier, forms a first converter power supply circuit. The output terminal of the first four-quadrant rectifier is connected to the output terminal of the first rectifier circuit, and is used to convert the first single-phase AC power into the first DC power supply through the first four-quadrant rectifier, so as to output the first DC power supply at the output terminal of the first rectifier circuit. The second rectifier circuit includes a second contactor. The second contactor, together with the second traction winding of the main transformer and the input terminal of the second four-quadrant rectifier, forms a second converter power supply circuit. The output terminal of the second four-quadrant rectifier is connected to the output terminal of the second rectifier circuit, which is used to convert the second single-phase AC power into the second DC power supply through the second four-quadrant rectifier, so as to output the second DC power supply at the output terminal of the second rectifier circuit. The third rectifier circuit includes a third contactor, which, together with the third traction winding of the main transformer and the input terminal of the third four-quadrant rectifier, forms a third converter power supply circuit. The output terminal of the third four-quadrant rectifier is connected to the output terminal of the third rectifier circuit, and is used to convert the third single-phase AC power into the third DC power supply through the third four-quadrant rectifier, so as to supply the third DC power supply to the output terminal of the second rectifier circuit.

4. The locomotive converter system according to claim 1, characterized in that, The power supply inside the main generator includes the main generator and the internal combustion converter circuit. The output terminal of the main generator is connected to the output terminal of the power supply inside the main generator through an internal combustion converter circuit. This circuit is used to convert the three-phase AC power supplied by the output terminal of the main generator into DC power supply for internal combustion in internal combustion traction mode or hybrid traction mode, so that the output terminal of the power supply inside the main generator can output DC power for internal combustion traction. The output terminals of the power supply inside the main generator are connected in parallel with the first, second, and third output terminals of the power supply inside the main transformer and then connected to the DC bus module.

5. The locomotive converter system according to claim 4, characterized in that, The internal combustion converter circuit includes a three-phase line contactor. The input terminal of the three-phase line contactor is connected to the input terminal of the internal combustion converter circuit, and the output terminal of the three-phase line contactor is connected to the input terminal of a three-phase full-bridge rectifier. The output terminal of the three-phase full-bridge rectifier is connected to the output terminal of the internal combustion converter circuit. This circuit is used to convert the three-phase AC power of the internal combustion engine into DC power supply for the internal combustion engine through the three-phase full-bridge rectifier, so that the DC power supply for the internal combustion engine can be output from the output terminal of the internal combustion converter circuit.

6. The locomotive converter system according to claim 1, characterized in that, The main power supply unit includes a first main traction three-phase inverter, a second main traction three-phase inverter, and a third main traction three-phase inverter. The input terminal of the first main traction three-phase inverter is connected to the input terminal of the main power supply unit, and the output terminal of the first main traction three-phase inverter is the first output terminal of the main power supply unit. It is used to convert the DC power provided by the DC bus module into the first three-phase frequency-modulated and amplitude-modulated AC power through the first main traction three-phase inverter, so that the first output terminal of the main power supply unit can output the first main traction three-phase frequency-modulated and amplitude-modulated AC power. The input terminal of the second main traction three-phase inverter is connected to the input terminal of the main power supply unit, and the output terminal of the second main traction three-phase inverter is the second output terminal of the main power supply unit. It is used to convert the DC power provided by the DC bus module into the second three-phase frequency-modulated and amplitude-modulated AC power through the second main traction three-phase inverter, so that the second output terminal of the main power supply unit can output the second main traction three-phase frequency-modulated and amplitude-modulated AC power. The input terminal of the third main traction three-phase inverter is connected to the input terminal of the main power supply unit. The output terminal of the third main traction three-phase inverter is the third output terminal of the main power supply unit. It is used to convert the DC power provided by the DC bus module into the third three-phase frequency-modulated and amplitude-modulated AC power through the third main traction three-phase inverter, so as to supply the third output terminal of the main power supply unit with the third main traction three-phase frequency-modulated and amplitude-modulated AC power.

7. The locomotive converter system according to claim 6, characterized in that, The first output terminal of the main power supply unit is connected to the first input terminal of the main traction unit; The second output terminal of the main power supply unit is connected to the second input terminal of the main traction unit; The third output terminal of the main power supply unit is connected to the third input terminal of the main traction unit; The main traction unit includes a first traction motor, a second traction motor, and a third traction motor; The input terminal of the first traction motor is connected to the first input terminal of the main traction unit, and is used to supply the first traction motor with the first main traction three-phase frequency-modulated and amplitude-modulated AC power provided by the main traction unit. The input terminal of the second traction motor is connected to the second input terminal of the main traction unit, and is used to supply the second traction motor with the AC power provided by the main traction unit, which is a three-phase frequency-modulated and amplitude-modulated AC power. The input terminal of the third traction motor is connected to the third input terminal of the main traction unit, and is used to supply the third traction motor with the AC power provided by the main traction unit, which is a three-phase frequency-modulated and amplitude-modulated AC power.

8. The locomotive converter system according to claim 1, characterized in that, The auxiliary power supply conditioning subunit includes an auxiliary power supply voltage regulator circuit, an auxiliary power supply inverter circuit, and an auxiliary power supply rectifier circuit; The input terminal of the auxiliary power supply voltage regulator circuit is connected to the input terminal of the auxiliary power supply conditioning subunit. The output terminal of the auxiliary power supply voltage regulator circuit is connected to the input terminal of the auxiliary power supply inverter circuit. The output terminal of the auxiliary power supply inverter circuit is connected to the input terminal of the auxiliary power supply rectifier circuit. The output terminal of the auxiliary power supply rectifier circuit is connected to the output terminal of the auxiliary power supply conditioning subunit. It is used to output auxiliary high-stability DC power through the corresponding voltage regulation, inversion, and rectification of the auxiliary power supply voltage regulator circuit, auxiliary power supply inverter circuit, and auxiliary power supply rectifier circuit, so as to generate the corresponding first and second shunt currents for the first and second shunt current inverter circuits.

9. The locomotive converter system according to claim 1, characterized in that, The power supply unit includes a power supply voltage regulator circuit, a power supply inverter circuit, and a power supply rectifier circuit. The input terminal of the power supply voltage regulator circuit is connected to the input terminal of the power supply unit, the output terminal of the power supply voltage regulator circuit is connected to the input terminal of the power supply inverter circuit, the output terminal of the power supply inverter circuit is connected to the input terminal of the power supply rectifier circuit, and the output terminal of the power supply rectifier circuit is connected to the output terminal of the power supply conditioning subunit. It is used to generate a high-stability DC power supply for the power supply through the corresponding voltage regulation, inversion, and rectification of the power supply voltage regulator circuit, the power supply inverter circuit, and the power supply rectifier circuit, so as to output the DC power supply for the power supply unit.

10. The locomotive converter system according to claim 1, characterized in that, The main traction module also includes a braking energy consumption unit, the input of which is connected to the fourth output of the DC bus module; it is used to consume the electrical energy fed back by the main traction unit when the system is braking, if the system cannot consume the electrical energy fed back by the main traction unit.

11. The locomotive converter system according to claim 10, characterized in that, The braking energy consumption unit includes a chopper, the input terminal of which is connected to the input terminal of the braking energy consumption unit, and the output terminal of which is connected in series with an energy consumption network. The energy consumption network includes a resistor network composed of several energy consumption resistors, which is used to process the feedback electrical energy input from the braking energy consumption unit through the chopper's switching on and off, and then consume the electrical energy through the energy consumption network.

12. The locomotive converter system according to claim 11, characterized in that, The braking energy consumption unit is also used to process the electrical energy exceeding the predetermined threshold by switching the chopper on and off, and then consume the electrical energy through the energy consumption network if the voltage of the DC power supplied by the DC bus module exceeds the predetermined threshold.

13. The locomotive converter system according to claim 1, characterized in that, The DC bus module also includes a voltage-stabilized energy storage unit, which is connected in parallel to the input terminal of the DC bus module and is used to consume the electrical energy provided by the DC bus module that exceeds a predetermined threshold.

14. The locomotive converter system according to claim 13, characterized in that, The voltage-stabilized energy storage unit includes a resistive-capacitive network for consuming electrical energy.

15. A locomotive converter method integrating main and auxiliary power supply functions, characterized in that, Applied to the locomotive converter system as described in any one of claims 1-14, the locomotive converter method includes: The DC power supplied by each internal power source is combined through different power supply modes and then sent to the DC bus module. The different power supply modes include electric traction mode, internal combustion traction mode, and a hybrid traction mode composed of electric traction mode and internal combustion traction mode. The DC power supplied by the DC bus module is inverted by the main power supply unit into three-phase frequency-modulated and amplitude-modulated AC power for the main traction unit to operate. The DC power supplied by the DC bus module is inverted into three-phase frequency-modulated and amplitude-modulated AC power for auxiliary traction through the auxiliary traction unit, so as to power the first auxiliary traction unit and the second auxiliary traction unit. The DC power supplied by the DC bus module is converted into DC power for the train supply traction unit through the train supply traction unit.

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