Locomotive conversion system and method integrating main and auxiliary supply functions

Abstract

The invention relates to the technical field of locomotive converters, in particular to a locomotive converter system and method integrating main and auxiliary supply functions, and the system comprises an internal electric double-source system power supply consisting of a main transformer internal power supply and a main generator internal power supply, a direct current bus module, a main traction module, an auxiliary traction module and a train supply traction module, the system solves the problems of high equipment manufacturing cost and low operation economic energy efficiency of a traditional reconnection traction locomotive converter system, and has the integrated double-source locomotive converter integrating traction, auxiliary power supply and train power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of locomotive converters, and in particular to a locomotive converter system and method integrating main and auxiliary supply functions. Background Art

[0002] At present, mainline locomotives are mainly divided into three types according to the traction mode, namely electric locomotive traction, diesel locomotive traction, and electric locomotive + diesel locomotive combined traction; electric locomotive + diesel locomotive combined traction mainly solves the problem of mixed operation of electrified railways and non-electrified railways. At the same time, it has self-rescue capabilities when the train power supply network is abnormal, and can be used in special scenarios with extremely high requirements for operational reliability. However, there are problems of high equipment manufacturing cost and low operational economy. The above structure has the problem of high equipment manufacturing cost and low operational economic efficiency of the locomotive converter system of traditional combined traction. Summary of the invention

[0003] In order to solve the technical problem of low energy efficiency of the system based on diesel generator sets, according to the topological structure requirement scenario of the locomotive inverter system of traditional multiple traction, the present invention provides a locomotive inverter system and method integrating main and auxiliary supply functions.

[0004] In a first aspect, an embodiment of the present invention provides a locomotive converter system with integrated main and auxiliary supply functions, including an internal dual-source power supply consisting of an internal power supply of a main transformer and an internal power supply of a main generator, a DC bus module, and a main traction module, an auxiliary traction module, and a train supply traction module;

[0005] The output ends of the internal power supplies including the power supply in the main transformer and the power supply in the main generator are connected in parallel to each other and then connected to the DC bus module, so as to send the DC power provided by each internal power supply to the DC bus module after being converged through different power supply modes, wherein the different power supply modes include an electric traction mode, an internal combustion traction mode, and a mixed traction mode consisting of the electric traction mode and the internal combustion traction mode;

[0006] The first output end of the DC bus module is connected to the main traction module, and 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, and is used to invert the DC power provided by the DC bus module into AC power with three-phase frequency and amplitude modulation for main traction through the main power supply unit, so as to supply the operation of the main traction unit;

[0007] The second output end of the DC bus module is connected to the auxiliary traction module, and the auxiliary traction module includes an auxiliary power supply unit, 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 invert the DC power provided by the DC bus module into AC power with three-phase frequency and amplitude modulation of auxiliary traction through the auxiliary traction unit, so as to provide the operation of the first auxiliary traction unit and the second auxiliary traction unit;

[0008] The third output end of the DC bus module is connected to the column supply traction module, and the column supply traction module includes a column supply power supply unit and a column supply traction unit. The input end of the column supply power supply unit is connected to the input end of the column supply traction module, and the output end of the column supply power supply unit is connected to the column supply traction unit, which is used to convert the DC power provided by the DC bus module into column supply DC power through the column supply traction unit to supply the column supply traction unit for operation.

[0009] Preferably, it includes: the power supply in the main transformer includes a main transformer, a first rectifier circuit, a second rectifier circuit and a third rectifier circuit;

[0010] 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 input terminal of the power supply of the main transformer;

[0011] The first traction winding of the main transformer is connected to the output end of the power supply in the main transformer through a first rectifier circuit, and is used to convert the first single-phase AC power provided by the first traction winding of the main transformer into a first DC power supply through the first rectifier circuit in the electric traction mode or the hybrid traction mode, so that the first output end of the power supply in the main transformer outputs the first traction winding DC power;

[0012] The second traction winding of the main transformer is connected to the output end of the power supply in the main transformer through a second rectifier circuit, and is used to convert the second single-phase AC power provided by the second traction winding of the main transformer into a second DC power supply through the second rectifier circuit in the electric traction mode or the hybrid traction mode, so that the second output end of the power supply in the main transformer outputs the second traction winding DC power;

[0013] The third traction winding of the main transformer is connected to the output end of the power supply in the main transformer through a third rectifier circuit, and is used to convert the third single-phase AC power provided by the third traction winding of the main transformer into a third DC power supply through the third rectifier circuit in the electric traction mode or the hybrid traction mode, so that the third output end of the power supply in the main transformer outputs the third traction winding DC power;

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

[0015] Preferably, the first rectifier circuit includes a first contactor, the first contactor and the first traction winding of the main transformer and the input end of the first four-quadrant rectifier form a first current conversion power supply circuit, the output end of the first four-quadrant rectifier is connected to the output end of the first rectifier circuit, and is used to convert the first single-phase alternating current into a first direct current power supply through the first four-quadrant rectifier, so that the output end of the first rectifier circuit outputs the first direct current power supply;

[0016] The second rectifier circuit includes a second contactor, the second contactor and the second traction winding of the main transformer and the input end of the second four-quadrant rectifier form a second current conversion power supply circuit, the output end of the second four-quadrant rectifier is connected to the output end of the second rectifier circuit, and is used to convert the second single-phase alternating current into a second direct current power supply through the second four-quadrant rectifier, so that the output end of the second rectifier circuit outputs the second direct current power supply;

[0017] The third rectifier circuit includes a third contactor, which forms a third current conversion power supply circuit with the third traction winding of the main transformer and the input end of the third four-quadrant rectifier. The output end of the third four-quadrant rectifier is connected to the output end of the third rectifier circuit, and is used to convert the third single-phase alternating current into a third direct current power supply through the third four-quadrant rectifier, so that the output end of the second rectifier circuit can output the third direct current power supply.

[0018] Preferably, it includes: the power supply in the main generator includes a main generator and an internal combustion converter circuit;

[0019] The output end of the main generator is connected to the output end of the power supply in the main generator through the internal combustion current conversion circuit, and is used to convert the internal combustion three-phase AC power provided by the output end of the main generator into internal combustion DC power supply through the internal combustion current conversion circuit in the internal combustion traction mode or the hybrid traction mode, so that the output end of the power supply in the main generator can output internal combustion traction DC power;

[0020] The output end of the power supply in the main generator and the first output end, the second output end, and the third output end of the power supply in the main transformer are connected in parallel to each other and then connected to the DC bus module.

[0021] Preferably, it includes: the internal combustion conversion circuit includes a three-phase line contactor, the input end of the three-phase line contactor is connected to the input end of the internal combustion conversion circuit, the output end of the three-phase line contactor is connected to the input end of the three-phase full-bridge rectifier, and the output end of the three-phase full-bridge rectifier is connected to the output end of the internal combustion conversion circuit, which is used to convert the internal combustion three-phase alternating current into internal combustion direct current power supply through the three-phase full-bridge rectifier, so that the internal combustion direct current power supply is outputted at the output end of the internal combustion conversion circuit.

[0022] Preferably, it includes: 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;

[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, which is used to invert the direct current provided by the DC bus module into a 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 can output 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, which is used to invert the DC power provided by the DC bus module into a second three-phase frequency-modulated and amplitude-modulated AC power through the second main traction three-phase inverter, so that the second output end of the main power supply unit can output the second main traction three-phase frequency-modulated and amplitude-modulated AC power;

[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, which is used to invert the DC power provided by the DC bus module into a third three-phase frequency-modulated and amplitude-modulated AC power through the third main traction three-phase inverter, so that the third output end of the main power supply unit can output the third main traction three-phase frequency-modulated and amplitude-modulated AC power.

[0026] Preferably, it includes:

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

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

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

[0030] The main traction unit includes 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, and is used to supply the first main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit to the operation of the first traction motor;

[0032] The input end of the second traction motor is connected to the second input end of the main traction unit, and is used to supply the second main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit to the operation of the second traction motor;

[0033] The input end of the third traction motor is connected to the third input end of the main traction unit, and is used to supply the third traction motor with the third main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit.

[0034] Preferably, it includes:

[0035] The auxiliary power supply unit includes 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, and is used to generate a first shunt through the first shunt inverter circuit for the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit, so that the first output end of the auxiliary power supply unit outputs the first auxiliary power shunt;

[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, so as to generate a second shunt through the second shunt inverter circuit for the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit, so as to output the second auxiliary power supply shunt at the second output end of the auxiliary power supply unit.

[0039] Preferably, it includes:

[0040] The auxiliary power supply conditioning subunit includes an auxiliary power supply voltage stabilizing circuit, an auxiliary power supply inverter circuit, and an auxiliary power supply rectifying 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, and is used to output auxiliary high-stable direct current through the corresponding voltage stabilizing, inverting, and rectifying direct current conditioning of the auxiliary power supply voltage stabilizing circuit, the auxiliary power supply inverter circuit, and the auxiliary power supply rectifier circuit, so as to provide the first shunt inverter circuit and the second shunt inverter circuit with the corresponding first shunt and second shunt.

[0042] Preferably, it includes:

[0043] The column power supply unit includes a column power supply voltage stabilizing circuit, a column power supply inverter circuit, and a column power supply rectifying 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, which is used to generate column-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 the column supply direct current at the output end of the column power supply unit.

[0045] Preferably, it includes:

[0046] The main traction module also includes a braking energy consumption unit, an input end of which is connected to the fourth output end of the DC bus module; when the system is braking, if the system cannot consume the electric energy fed back by the main traction unit, the electric energy fed back by the main traction unit is consumed through the braking energy consumption unit.

[0047] Preferably, it includes:

[0048] The braking energy consumption unit includes a chopper, the input end of the chopper is connected to the input end of the braking energy consumption unit, and the output end of the chopper is connected in series with an energy consumption network, wherein the energy consumption network includes a resistor network composed of a plurality of energy consumption resistors, which are used to consume the feedback electric energy input by the braking energy consumption unit through the energy consumption network after the chopper is turned on and off.

[0049] Preferably, it includes:

[0050] The braking energy consumption unit is also used for consuming the electric energy exceeding the predetermined threshold through the energy consumption network after the electric energy exceeding the predetermined threshold is processed by the connection and disconnection of the chopper if the voltage of the direct current provided by the direct current bus module exceeds the predetermined threshold.

[0051] Preferably, it includes:

[0052] The DC bus module also includes a voltage-stabilizing energy storage unit, which is connected in parallel to the input end of the DC bus module and is used to consume the electric energy of the DC power provided by the DC bus module that exceeds a predetermined threshold.

[0053] Preferably, it includes: the voltage-stabilizing energy storage unit includes a resistor-capacitor network for consuming electrical energy.

[0054] On the other hand, the present invention also provides a locomotive power conversion method integrating main and auxiliary supply functions, comprising:

[0055] Based on the above locomotive power conversion system, the locomotive power conversion method includes:

[0056] The direct current provided by each internal power source is sent to the direct current bus module after being converged through different power supply modes, wherein the different power supply modes include electric traction mode, internal combustion traction mode, and a hybrid traction mode consisting of the electric traction mode and the internal combustion traction mode;

[0057] The DC power provided by the DC bus module is inverted into three-phase frequency-modulated and amplitude-modulated AC power for the main traction unit through the main power supply unit to supply the main traction unit with power;

[0058] The DC power provided by the DC bus module is inverted into auxiliary traction three-phase frequency-amplitude-modulated AC power through the auxiliary traction unit to supply the operation of the first auxiliary traction unit and the second auxiliary traction unit;

[0059] It is used to convert the DC power provided by the DC bus module into column-supply DC power through the column-supply traction unit to operate the column-supply traction unit. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0061] Figure 2 is a system structure diagram of an embodiment of the present invention;

[0062] Figure 3 is an electrical schematic diagram of a four-quadrant rectifier according to an embodiment of the present invention;

[0063] Figure 4 is an electrical schematic diagram of a three-phase full-bridge rectifier according to an embodiment of the present invention;

[0064] Figure 5 is an electrical schematic diagram of a traction three-phase inverter according to an embodiment of the present invention;

[0065] Figure 6 is an electrical schematic diagram of a chopper according to an embodiment of the present invention;

[0066] Figure 7 is an electrical schematic diagram of an auxiliary power supply unit according to an embodiment of the present invention;

[0067] Figure 8 is an electrical schematic diagram of a column power supply unit according to an embodiment of the present invention;

[0068] Fig. 9 It is an electrical schematic diagram of another embodiment of the present invention in which the power supply in the main transformer and the power supply in the main generator are output in parallel;

[0069] Fig.10 It is an electrical schematic diagram of power frequency isolation of an auxiliary power supply unit and a column power supply unit according to another embodiment of the present invention; DETAILED DESCRIPTION

[0070] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0071] Figure 1 FIG. 1 is a block diagram of a power supply system according to an embodiment of the present invention. Figure 1 As shown, the embodiment of the present invention includes a locomotive converter system with integrated main and auxiliary supply functions, characterized in that it includes an internal power supply consisting 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;

[0072] The output ends of the internal power supplies 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, which is used to converge the DC power provided by the internal power supplies through different power supply modes and then send them to the DC bus module A200, wherein the different power supply modes include electric traction mode, internal combustion traction mode, and a mixed traction mode consisting of the electric traction mode and the internal combustion traction mode;

[0073] The first output end of the DC bus module A200 is connected to the main traction module A300, and the main traction module A300 includes a main power supply unit A301 and a main traction unit A302. The first input end of the main power supply unit A301 is connected to the input end of the main traction module A300, and the output end of the main power supply unit A301 is connected to the main traction unit A302, which is used to invert the DC power provided by the DC bus module A200 into the main traction three-phase frequency-amplitude-modulated AC power through the main power supply unit A301, so as to supply the main traction unit A302 with operation;

[0074] The second output end of the DC bus module A200 is connected to the auxiliary traction module A310, and the auxiliary traction module A310 includes an auxiliary power supply unit A311, a first auxiliary traction unit A312, and a second auxiliary traction unit A313. The input end of the auxiliary power supply unit A311 is connected to the input end of the auxiliary traction module A310, the first output end of the auxiliary power supply unit A311 is connected to the first auxiliary traction unit A312, and the second output end is connected to the second auxiliary traction unit A313, which is used to invert the DC power provided by the DC bus module A200 into auxiliary traction three-phase frequency-amplitude modulated AC power through the auxiliary traction unit, so as to provide the first auxiliary traction unit A312 and the second auxiliary traction unit A313 with operation;

[0075] The third output end of the DC bus module A200 is connected to the column supply traction module A320, and the column supply traction module A320 includes a column supply power supply unit A321 and a column supply traction unit A322. The input end of the column supply power supply unit A321 is connected to the input end of the column supply traction module A320, and the output end of the column supply power supply unit A321 is connected to the column supply traction unit A322, which is used to convert the DC power provided by the DC bus module A200 into column supply DC power through the column supply traction unit A322, so as to operate the column supply traction unit A322.

[0076] According to one embodiment of the present invention, Figure 2 As shown, the power supply A100 in the main transformer 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 power supply A100 in the main transformer is connected to the power grid; the input stage of the main transformer T1001 is connected to the input end of the power supply A100 in the main transformer;

[0078] The first traction winding of the main transformer T1001 is connected to the output end of the power supply A100 in the main transformer through the first rectifier circuit A1001, and is used to convert the first single-phase AC power provided by the first traction winding of the main transformer T1001 into a first DC power supply through the first rectifier circuit A1001 in the electric traction mode or the hybrid traction mode, so that the first output end of the power supply A100 in the main transformer outputs the first traction winding DC power;

[0079] The second traction winding of the main transformer T1001 is connected to the output end of the power supply A100 in the main transformer through the second rectifier circuit A1002, and is used to convert the second single-phase AC power provided by the second traction winding of the main transformer T1001 into a second DC power supply through the second rectifier circuit A1002 in the electric traction mode or the hybrid traction mode, so that the second output end of the power supply A100 in the main transformer can output the second traction winding DC power;

[0080] The third traction winding of the main transformer T1001 is connected to the output end of the power supply A100 in the main transformer through the third rectifier circuit A1003, and is used to convert the third single-phase AC power provided by the third traction winding of the main transformer T1001 into a third DC power supply through the third rectifier circuit A1003 in the electric traction mode or the hybrid traction mode, so that the third output end of the power supply A100 in the main transformer can output the third traction winding DC power;

[0081] The first output terminal, the second output terminal, and the third output terminal of the power supply A100 in the main transformer are connected in parallel to each other and then connected to the DC bus module A200.

[0082] According to one embodiment of the present invention, Figure 2 As shown, the first rectifier circuit includes a first contactor K1001, the first contactor K1001 and the first traction winding of the main transformer T1001 and the input end of the first four-quadrant rectifier AD1001 form a first current conversion power supply circuit, the output end of the first four-quadrant rectifier AD1001 is connected to the output end of the first rectifier circuit, and is used to convert the first single-phase alternating current into a first direct current power supply through the first four-quadrant rectifier AD1001, so that the output end of the first rectifier circuit outputs the first direct current power supply;

[0083] The second rectifier circuit includes a second contactor K1002, the second contactor K1002 and the second traction winding of the main transformer T1001 and the input end of the second four-quadrant rectifier AD1002 form a second current conversion power supply circuit, the output end of the second four-quadrant rectifier AD1002 is connected to the output end of the second rectifier circuit, and is used to convert the second single-phase alternating current into a second direct current power supply through the second four-quadrant rectifier AD1002, so that the output end of the second rectifier circuit outputs the second direct current power supply;

[0084] The third rectifier circuit includes a third contactor K1003, and the third contactor K1003 forms a third current conversion power supply circuit with the third traction winding of the main transformer T1001 and the input end of the third four-quadrant rectifier AD1003. The output end of the third four-quadrant rectifier AD1003 is connected to the output end of the third rectifier circuit, and is used to convert the third single-phase alternating current into a third direct current power supply through the third four-quadrant rectifier AD1003, so that the output end of the second rectifier circuit can output the third direct current power supply.

[0085] According to one embodiment of the present invention, Figure 2 As shown, it includes: the main generator internal power supply A110 includes a main generator M1101 and an internal combustion converter circuit A1101;

[0086] The output end of the main generator M1101 is connected to the output end of the power supply A110 in the main generator through the internal combustion conversion circuit A1101, and is used to convert the internal combustion three-phase AC power provided by the output end of the main generator M1101 into internal combustion DC power supply through the internal combustion conversion circuit A1101 in the internal combustion traction mode or the hybrid traction mode, so that the output end of the power supply A110 in the main generator can output internal combustion traction DC power;

[0087] The output end of the power supply A110 in the main generator and the first output end, the second output end, and the third output end of the power supply A100 in the main transformer are connected in parallel to each other and then connected to the DC bus module A200.

[0088] According to one embodiment of the present invention, Figure 2 As shown, it includes: the internal combustion conversion 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 conversion 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, and the output end of the three-phase full-bridge rectifier AD1101 is connected to the output end of the internal combustion conversion circuit A1101, which is used to convert the internal combustion three-phase alternating current into internal combustion direct current power supply through the three-phase full-bridge rectifier AD1101, so that the internal combustion direct current power supply is outputted at the output end of the internal combustion conversion circuit A1101.

[0089] According to one embodiment of the present invention, Figure 2 As shown, it includes: 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, which is used to invert the direct current provided by the DC bus module A200 into a first three-phase frequency-modulated and amplitude-modulated alternating current through the first main traction three-phase inverter DA3001, so that the first output end of the main power supply unit A301 can output the first main traction three-phase frequency-modulated and amplitude-modulated 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, which is used to invert the direct current provided by the DC bus module A200 into a second three-phase frequency-modulated and amplitude-modulated alternating current through the second main traction three-phase inverter DA3002, so that the second output end of the main power supply unit A301 can output the second main traction three-phase frequency-modulated and amplitude-modulated 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, which is used to invert the DC power provided by the DC bus module A200 into a third three-phase frequency-modulated and amplitude-modulated AC power through the third main traction three-phase inverter DA3003, so that the third output end of the main power supply unit A301 can output the third main traction three-phase frequency-modulated and amplitude-modulated AC power.

[0093] According to one embodiment of the present invention, Figure 2 As shown, including:

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

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

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

[0097] The main traction unit A302 includes 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, and is used to supply the first main traction three-phase frequency-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, and is used to supply 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, and is used to supply the third main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit A302 to operate the third traction motor M3003.

[0101] According to one embodiment of the present invention, Figure 2 As shown, including:

[0102] The auxiliary power supply unit A311 includes 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, and is used to generate a first shunt through the first shunt inverter circuit A3112 for the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit A3111, so that the first output end of the auxiliary power supply unit A311 can output the first auxiliary power shunt;

[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, and 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 is used to generate a second shunt through the second shunt inverter circuit A3113 for the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit A3111, so that the second output end of the auxiliary power supply unit A311 can output the second auxiliary power shunt.

[0106] According to one embodiment of the present invention, Figure 2 As shown, including:

[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 rectifying 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, and is used to output auxiliary high-stable direct current through the corresponding voltage stabilizing, inverting and rectifying direct current conditioning of the auxiliary power supply voltage stabilizing circuit A31111, the auxiliary power supply inverter circuit A31112 and the auxiliary power supply rectifier circuit A31113, so as to provide the first shunt inverter circuit A3112 and the second shunt inverter circuit A3113 with the corresponding first shunt and second shunt.

[0109] According to one embodiment of the present invention, Figure 2 As shown, including:

[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 rectifying circuit A32113;

[0111] The input end of the column power supply voltage stabilizing circuit A32111 is connected to the input end of the column power supply unit A321, the output end of the column power supply voltage stabilizing circuit A32111 is connected to the input end of the column power supply inverter circuit A32112, the output end of the column power supply inverter circuit A32112 is connected to the input end of the column power supply rectifier circuit A32113, and the output end of the column power supply rectifier circuit A32113 is connected to the output end of the column power supply conditioning subunit, which is used to generate column-supply high-stable direct current through the corresponding voltage stabilization, inversion and rectification of the column power supply voltage stabilizing circuit A32111, the column power supply inverter circuit A32112 and the column power supply rectifier circuit A32113, so as to output the column supply direct current at the output end of the column power supply unit A321.

[0112] According to one embodiment of the present invention, Figure 2 As shown, including:

[0113] The main traction module A300 also includes a braking energy consumption unit A303, the input end of which is connected to the fourth output end of the DC bus module A200; when the system is braking, 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 braking energy consumption unit A303.

[0114] According to one embodiment of the present invention, Figure 2 As shown, including:

[0115] The braking energy consumption unit A303 includes a chopper DD3031, the input end of the chopper DD3031 is connected to the input end of the braking 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 includes a resistor network composed of a plurality of choppers R3031, which is used to consume the electric energy fed back from the braking energy consumption unit A303 through the energy consumption network after the chopper DD3031 is turned on and off.

[0116] According to one embodiment of the present invention, Figure 2 As shown, including:

[0117] The braking energy consumption unit A303 is also used to consume the electric energy exceeding the predetermined threshold through the energy consumption network after the electric energy exceeding the predetermined threshold is connected and disconnected by the chopper DD3031 if the voltage of the direct current provided by the direct current bus module A200 exceeds the predetermined threshold.

[0118] According to one embodiment of the present invention, Figure 2 As shown, including:

[0119] The DC bus module A200 further includes a voltage-stabilizing energy storage unit A2101, which is connected in parallel to the input end of the DC bus module A200 and is used to consume the electric energy of the DC power provided by the DC bus module A200 that exceeds a predetermined threshold.

[0120] According to one embodiment of the present invention, Figure 2 As shown, it includes: the voltage-stabilizing energy storage unit A2101 includes a resistor-capacitor network RC2101 for consuming electrical energy.

[0121] At the same time, the present invention also provides a locomotive power conversion method integrating main and auxiliary supply functions, comprising:

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

[0123] The DC power provided by each internal power source is sent to the DC bus module A200 after being converged through different power supply modes, wherein the different power supply modes include an electric traction mode, an internal combustion traction mode, and a hybrid traction mode consisting 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 the main traction three-phase frequency-amplitude-modulated AC power through the main power supply unit A301 to supply the main traction unit A302 with power;

[0125] The DC power provided by the DC bus module A200 is inverted into auxiliary traction three-phase frequency-amplitude-modulated AC power through the auxiliary traction unit to supply the operation of the first auxiliary traction unit A312 and the second auxiliary traction unit A313;

[0126] It is used to convert the DC power provided by the DC bus module A200 into column supply DC power through the column supply traction unit A322, so as to operate the column supply traction unit A322.

[0127] Combine the following Figure 1 , 2 The working principle of the locomotive inverter system shown in the embodiment is explained.

[0128] like Figure 1 , 2As shown, the locomotive converter system includes an internal electric dual-source power supply composed of a power supply inside the main transformer and a power supply inside the main generator, a DC bus module, and a main traction module, an auxiliary traction module, and a column supply traction module; wherein, the locomotive converter system adopts main and auxiliary supply integration, that is, the converter integrates three-axis traction, two auxiliary power supplies, and one column supply, wherein the converter integrates three-axis traction including a main traction module, 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 auxiliary power supplies include an auxiliary power supply unit and a first auxiliary traction unit and a second auxiliary traction unit, and the one column supply includes a column supply unit and a column supply traction unit. Through the above structure, the integration of a full set of traction power supply, auxiliary power supply and column supply is realized; at the same time, the locomotive converter system adopts an internal electric dual-source system, that is, an internal combustion mode full-bridge rectifier is added to connect to the intermediate DC circuit of the converter, specifically, including electric traction mode and internal combustion traction mode, wherein the electric traction mode adopts the main transformer The internal power supply of the transformer is used for realization, and the internal power supply of the main generator is used for realization of the internal power supply of the main generator for realization of the internal combustion traction mode. At the same time, the internal power supply of the main transformer and the internal power supply of the main generator are used to realize the mixed traction mode of the electric traction mode and the internal combustion traction mode. Finally, the output ends of the internal power supplies of the main transformer and the main generator are connected in parallel to the DC bus module. Through the above structure, the converter has the capabilities of electric traction, internal combustion traction, and electric and internal combustion mixed traction. At the same time, this system realizes the miniaturization and lightweight of auxiliary transformers and train supplies, and adopts high-frequency auxiliary transformers and train supplies. Compared with traditional industrial frequency auxiliary transformers and train supplies, the volume and weight are greatly reduced. In summary, the dual-source locomotive adds an internal combustion generator on the basis of the electric locomotive, so that a locomotive has three traction modes: electric traction, internal combustion traction, and electric and internal combustion mixed traction. It has strong availability and high cost-effectiveness. Adding an internal combustion generator will put forward higher requirements on the miniaturization and lightweight of various equipment of the locomotive. This system has an integrated dual-source locomotive converter with integrated traction, auxiliary power supply and train power supply.

[0129] To summarize, the dual-source locomotive solution of this system is electric locomotive + diesel locomotive combined traction, with high operating efficiency. This system mainly solves the problem of lightweight and miniaturization of dual-source locomotive inverters that integrate electricity and diesel on the locomotive, so that the inverter can achieve dual-source drive of electricity and diesel, and adopts high-frequency auxiliary and train supply solutions to enable a set of inverter equipment to provide complete traction power supply, auxiliary power supply and train power supply functions.

[0130] Combine the following Figure 1 , 2 The working principle of the locomotive inverter system shown in the embodiment is explained.

[0131] like Figure 1 , 2As shown, the power supply in the main transformer includes a main transformer, a first rectifier circuit, a second rectifier circuit and a third rectifier circuit; the input end of the power supply in the main transformer is connected to the power grid; the input stage of the main transformer is connected to the input end of the power supply in the main transformer; the first traction winding of the main transformer is connected to the output end of the power supply in the main transformer through the first rectifier circuit; the second traction winding of the main transformer is connected to the output end of the power supply in the main transformer through the second rectifier circuit; the third traction winding of the main transformer is connected to the output end of the power supply in the main transformer through the third rectifier circuit; The three traction windings of the main transformer in the power traction mode are respectively 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 to convert the single-phase AC power into DC power for the intermediate DC circuit of the converter; the first output end, the second output end, and the third output end of the power supply in the main transformer are connected in parallel to each other and then connected to the DC bus module; at the same time, during electric and internal combustion mixed traction, the main transformer and the main generator simultaneously supply power to the converter; wherein, the rectifier circuits all include contactors, four-quadrant rectifiers, etc.

[0132] like Figure 3 As shown, the circuit principles of the first four-quadrant rectifier, the second four-quadrant rectifier, and the third four-quadrant rectifier are as follows Figure 3 As shown, IGBT is used as a switching device, and pulse modulation control technology is used to control the output DC voltage of the rectifier to be stable. By adjusting the pulse modulation angle, the current and voltage on the AC side are in phase under traction conditions, so that the power factor on the grid side is close to 1.0.

[0133] The power supply in the main generator includes a main generator and an internal combustion conversion circuit; the output end of the main generator is connected to the output end of the power supply in the main generator through the internal combustion conversion circuit, and is used to convert the internal combustion three-phase AC power provided by the output end of the main generator into internal combustion DC power supply through the internal combustion conversion circuit in the internal combustion traction mode or the hybrid traction mode, so that the output end of the power supply in the main generator can output internal combustion traction DC power; the three-phase AC 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 AC power into DC power to supply to the intermediate DC circuit of the converter; at the same time, in the case of electric and internal combustion hybrid traction, the main transformer and the main generator supply power to the converter at the same time;

[0134] The output end of the power supply in the main generator and the first output end, the second output end, and the third output end of the power supply in the main transformer are connected in parallel to each other and then connected to the DC bus module; the AC power is converted into DC power through the first rectifier, the second rectifier, the third rectifier, and the fourth rectifier to supply the intermediate DC circuit of the converter.

[0135] like Figure 4 As shown, the circuit principle of the three-phase full-bridge rectifier is as follows Figure 4 As shown, a rectifier tube is used as a switching device, and the three-phase AC power output by the main generator is converted into a DC output through a three-phase full-bridge rectifier.

[0136] Combine the following Figure 1 , 2 The working principle of the locomotive inverter system shown in the embodiment is explained.

[0137] like Figure 1 , 2 As 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-mentioned circuit structure, such as the first traction inverter, the second traction inverter, and the third traction inverter, direct current is converted into three-phase alternating current 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] like Figure 5 As shown, the circuit principles of the first traction inverter, the second traction inverter circuit, and the third traction inverter are as follows Figure 5 As shown, IGBT is used as a switching device, and the DC power of the intermediate DC circuit of the converter is inverted into a three-phase AC output with adjustable frequency and voltage to drive the traction motor. Each traction motor corresponds to a traction inverter.

[0139] 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 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 includes 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 intermediate DC circuit of the converter, and through voltage stabilization, inversion, isolation and rectification, it is respectively inverted into two 3AC\380V auxiliary outputs, one of which is sinusoidally output to the locomotive auxiliary equipment through LC filtering, and the other directly outputs a quasi-sinusoidal wave to the main generator cooling fan for main generator cooling.

[0140] like Figure 7 As shown, the auxiliary converter takes power from the intermediate DC circuit of the converter, obtains a stable voltage output to the inverter circuit through a two-stage series voltage stabilizing circuit, and the purpose of the two-stage series connection is to reduce the voltage stress of the switching device. The LLC resonant conversion circuit enables the IGBT components of the inverter circuit on the primary side of the transformer to achieve zero voltage turn-on and low current turn-off, and the rectifier tube of the full-bridge rectifier on the secondary side achieves 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 by a three-phase LC filter and outputs a 3AC\380V sine wave to power the locomotive auxiliary equipment, which is the first auxiliary traction unit, and the inverter 24 outputs a 3AC380V quasi-sine wave to power the main generator cooling fan, which is the second auxiliary traction unit.

[0141] The column power supply unit includes 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 supply converter also draws power from the intermediate DC circuit of the converter, and outputs DC600V to supply power to the passenger train mounted at the rear end of the locomotive through voltage stabilization, inversion, isolation and rectification. If it is a traction freight car, the column supply converter can be omitted or cancelled;

[0142] like Figure 8As shown, the working principles of the voltage stabilizing circuit, high-frequency inverter circuit, LLC resonant circuit and full-bridge rectifier circuit at the front end of the train supply converter are exactly the same as those of the auxiliary converter. The LC filtering circuit is used to enable the train supply to output stable DC600V direct current for use in passenger trains.

[0143] Combine the following Figure 1 , 2 The working principle of the locomotive inverter system shown in the embodiment is explained.

[0144] like Figure 1 , 2 As shown, the main traction module also includes a braking energy consumption unit, the input end of which is connected to the fourth output end of the DC bus module; when the system is braking, if the system cannot consume the electric energy fed back by the main traction unit, the electric energy fed back by the main traction unit is consumed through the braking energy consumption unit; the braking energy consumption unit includes a chopper, the input end of the chopper is connected to the input end of the braking energy consumption unit, and the output end of the chopper is connected in series with an energy consumption network, wherein the energy consumption network includes a resistor network composed of a plurality of energy consumption resistors, which is used to consume the electric energy fed back by the braking energy consumption unit The fed-back electric energy is consumed through the energy consumption network after being processed by the connection and disconnection of the chopper; based on the above structure, the chopper controls the connection and disconnection of the braking resistor; when the locomotive brakes, the traction motor is converted into a generator state, and is converted into direct current to the intermediate direct current circuit through the first main inverter, the second main inverter, and the third main inverter. When the power contact network is working, the first four-quadrant rectifier, the second four-quadrant rectifier, and the third four-quadrant rectifier are used to invert the alternating current and feed the electric energy back to the power grid. When the power contact network is not working, the chopper resistor is directly connected through the chopper to consume it;

[0145] like Figure 6 As shown, the chopper circuit principle is as follows Figure 6 As shown, the upper tube uses IGBT as a switching device to control the conduction and disconnection of the braking resistor, and the lower tube uses a rectifier tube for current follow-up.

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

[0147] Combine the following Figure 1 , 2 The working principle of the locomotive inverter system shown in the embodiment is explained.

[0148] like Figure 1 ,2 As shown, the DC bus module also includes a voltage stabilizing energy storage unit, which is connected in parallel to the input end of the DC bus module and is used to consume the electric energy of the DC power provided by the DC bus module that exceeds a predetermined threshold; the voltage stabilizing energy storage unit includes a resistor-capacitor network for consuming electric energy; based on the above structure, the intermediate DC circuit of the converter (DC bus module) is usually composed of a number of power capacitors connected in series and in parallel to form a DC voltage stabilizing and energy storage unit, and generally a fixed discharge resistor is also connected in parallel, and when the converter fails and the energy stored in the capacitor of the intermediate DC circuit cannot be quickly discharged, it is consumed through the fixed discharge resistor.

[0149] like Fig. 9 As shown, as an alternative solution for the internal combustion traction mode, 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 full-bridge rectification using the IGBT anti-parallel diodes of the converter four-quadrant rectifier. The advantage of this solution is that it saves a three-phase full-bridge rectifier.

[0150] like Fig.10 As shown, the auxiliary converter and the column supply converter can also adopt the industrial frequency isolation solution. The traditional approach is to integrate the inverter module and the converter, and then install the auxiliary transformer and the filter in the auxiliary filter cabinet, and the column supply transformer, rectifier and filter in the column supply distribution cabinet. Multiple sets of equipment are required to work together, and the system occupies a large space and is heavy. The working principle of this solution is simple and the isolation effect is good.

[0151] The specific working steps of the locomotive inverter system shown in the embodiment are described below.

[0152] Based on the locomotive power conversion system as described above, the locomotive power conversion method includes:

[0153] The direct current provided by each internal power source is sent to the direct current bus module after being converged through different power supply modes, wherein the different power supply modes include electric traction mode, internal combustion traction mode, and a hybrid traction mode consisting of the electric traction mode and the 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 for the main traction unit through the main power supply unit to supply the main traction unit with power;

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

[0156] It is used to convert the DC power provided by the DC bus module into column-supply DC power through the column-supply traction unit to operate the column-supply traction unit.

[0157] The topological structure of this solution is combined with the above steps to form a locomotive power conversion method. This power conversion method has strong availability and high cost-effectiveness. Through this method, an integrated dual-source locomotive converter is finally formed.

[0158] The various embodiments of the present invention are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0159] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0160] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A locomotive power conversion system integrating main and auxiliary 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, and a main traction module, an auxiliary traction module, and a column supply traction module; The output ends of the internal power supplies including the power supply in the main transformer and the power supply in the main generator are connected in parallel to each other and then connected to the DC bus module, so as to send the DC power provided by each internal power supply to the DC bus module after being converged through different power supply modes, wherein the different power supply modes include electric traction mode, internal combustion traction mode, and a mixed traction mode consisting of the electric traction mode and the internal combustion traction mode; The first output end of the DC bus module is connected to the main traction module, and 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, and is used to invert the DC power provided by the DC bus module into AC power with three-phase frequency and amplitude modulation for main traction through the main power supply unit, so as to supply the operation of the main traction unit; The second output end of the DC bus module is connected to the auxiliary traction module, and the auxiliary traction module includes an auxiliary power supply unit, 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 invert the DC power provided by the DC bus module into AC power with three-phase frequency and amplitude modulation of auxiliary traction through the auxiliary traction unit, so as to provide the operation of the first auxiliary traction unit and the second auxiliary traction unit; The third output end of the DC bus module is connected to the column supply traction module, and the column supply traction module includes a column supply power supply unit and a column supply traction unit. The input end of the column supply power supply unit is connected to the input end of the column supply traction module, and the output end of the column supply power supply unit is connected to the column supply traction unit, which is used to convert the DC power provided by the DC bus module into column supply DC power through the column supply traction unit to supply the column supply traction unit for operation.

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

3. The locomotive inverter system according to claim 2, characterized in that: The first rectifier circuit includes a first contactor, the first contactor and the first traction winding of the main transformer and the input end of the first four-quadrant rectifier form a first current conversion power supply circuit, the output end of the first four-quadrant rectifier is connected to the output end of the first rectifier circuit, and is used to convert the first single-phase alternating current into a first direct current power supply through the first four-quadrant rectifier, so that the output end of the first rectifier circuit outputs the first direct current power supply; The second rectifier circuit includes a second contactor, the second contactor and the second traction winding of the main transformer and the input end of the second four-quadrant rectifier form a second current conversion power supply circuit, the output end of the second four-quadrant rectifier is connected to the output end of the second rectifier circuit, and is used to convert the second single-phase alternating current into a second direct current power supply through the second four-quadrant rectifier, so that the output end of the second rectifier circuit outputs the second direct current power supply; The third rectifier circuit includes a third contactor, which forms a third current conversion power supply circuit with the third traction winding of the main transformer and the input end of the third four-quadrant rectifier. The output end of the third four-quadrant rectifier is connected to the output end of the third rectifier circuit, and is used to convert the third single-phase alternating current into a third direct current power supply through the third four-quadrant rectifier, so that the output end of the second rectifier circuit can output the third direct current power supply.

4. The locomotive inverter system according to claim 1, characterized in that: The power supply in the main generator includes a main generator and an internal combustion converter circuit; The output end of the main generator is connected to the output end of the power supply in the main generator through the internal combustion current conversion circuit, and is used to convert the internal combustion three-phase AC power provided by the output end of the main generator into internal combustion DC power supply through the internal combustion current conversion circuit in the internal combustion traction mode or the hybrid traction mode, so that the output end of the power supply in the main generator can output internal combustion traction DC power; The output end of the power supply in the main generator and the first output end, the second output end, and the third output end of the power supply in the main transformer are connected in parallel to each other and then connected to the DC bus module.

5. The locomotive inverter system according to claim 4, characterized in that: The internal combustion conversion circuit includes a three-phase line contactor, the input end of the three-phase line contactor is connected to the input end of the internal combustion conversion circuit, the output end of the three-phase line contactor is connected to the input end of the three-phase full-bridge rectifier, and the output end of the three-phase full-bridge rectifier is connected to the output end of the internal combustion conversion circuit, which is used to convert the internal combustion three-phase alternating current into internal combustion direct current power supply through the three-phase full-bridge rectifier, so that the internal combustion direct current power supply can be outputted at the output end of the internal combustion conversion circuit.

6. The locomotive inverter 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 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, which is used to invert the direct current provided by the DC bus module into a 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 can output the first main traction three-phase frequency-modulated and amplitude-modulated alternating current; 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, which is used to invert the DC power provided by the DC bus module into a second three-phase frequency-modulated and amplitude-modulated AC power through the second main traction three-phase inverter, so that the second output end of the main power supply unit can output the second main traction three-phase frequency-modulated and amplitude-modulated AC power; 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, which is used to invert the DC power provided by the DC bus module into a third three-phase frequency-modulated and amplitude-modulated AC power through the third main traction three-phase inverter, so that the third output end of the main power supply unit can output the third main traction three-phase frequency-modulated and amplitude-modulated AC power.

7. The locomotive inverter 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 end of the first traction motor is connected to the first input end of the main traction unit, and is used to supply the first main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit to the operation of the first traction motor; The input end of the second traction motor is connected to the second input end of the main traction unit, and is used to supply the second main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit to the operation of the second traction motor; The input end of the third traction motor is connected to the third input end of the main traction unit, and is used to supply the third traction motor with the third main traction three-phase frequency-amplitude-modulated alternating current provided by the main traction unit.

8. The locomotive inverter system according to claim 1, characterized in that: 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 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, and is used to generate a first shunt through the first shunt inverter circuit for the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit, so that the first output end of the auxiliary power supply unit outputs the first auxiliary power shunt; 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, so as to generate a second shunt through the second shunt inverter circuit for the auxiliary high-stable direct current provided by the auxiliary power supply conditioning subunit, so as to output the second auxiliary power supply shunt at the second output end of the auxiliary power supply unit.

9. The locomotive inverter system according to claim 1, characterized in that: The auxiliary power supply conditioning subunit includes an auxiliary power supply voltage stabilizing circuit, an auxiliary power supply inverter circuit, and an auxiliary power supply rectifying circuit; 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, and is used to output auxiliary high-stable direct current through the corresponding voltage stabilizing, inverting, and rectifying direct current conditioning of the auxiliary power supply voltage stabilizing circuit, the auxiliary power supply inverter circuit, and the auxiliary power supply rectifier circuit, so as to provide the first shunt inverter circuit and the second shunt inverter circuit with the corresponding first shunt and second shunt.

10. The locomotive power conversion system according to claim 1, characterized in that: The column power supply unit includes a column power supply voltage stabilizing circuit, a column power supply inverter circuit, and a column power supply rectifying 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, which is used to generate column-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 the column supply direct current at the output end of the column power supply unit.

11. The locomotive inverter system according to claim 1, characterized in that: The main traction module also includes a braking energy consumption unit, an input end of which is connected to the fourth output end of the DC bus module; when the system is braking, if the system cannot consume the electric energy fed back by the main traction unit, the electric energy fed back by the main traction unit is consumed through the braking energy consumption unit.

12. The locomotive power conversion system according to claim 11, characterized in that: The braking energy consumption unit includes a chopper, the input end of the chopper is connected to the input end of the braking energy consumption unit, and the output end of the chopper is connected in series with an energy consumption network, wherein the energy consumption network includes a resistor network composed of a plurality of energy consumption resistors, which are used to consume the feedback electric energy input by the braking energy consumption unit through the energy consumption network after the chopper is turned on and off.

13. The locomotive power conversion system according to claim 12, characterized in that: The braking energy consumption unit is also used for consuming the electric energy exceeding the predetermined threshold through the energy consumption network after the electric energy exceeding the predetermined threshold is processed by the connection and disconnection of the chopper if the voltage of the direct current provided by the direct current bus module exceeds the predetermined threshold.

14. The locomotive power conversion system according to claim 1, characterized in that: The DC bus module also includes a voltage-stabilizing energy storage unit, which is connected in parallel to the input end of the DC bus module and is used to consume the electric energy of the DC power provided by the DC bus module that exceeds a predetermined threshold.

15. The locomotive power conversion system according to claim 14, characterized in that: The voltage-stabilizing energy storage unit includes a resistor-capacitor network for consuming electric energy.

16. A locomotive power conversion method integrating main and auxiliary supply functions, characterized in that: Applicable to the locomotive inverter system as claimed in any one of claims 1 to 15, The locomotive flow conversion method comprises: The direct current provided by each internal power source is sent to the direct current bus module after being converged through different power supply modes, wherein the different power supply modes include electric traction mode, internal combustion traction mode, and a hybrid traction mode consisting of the electric traction mode and the internal combustion traction mode; The DC power provided by the DC bus module is inverted into three-phase frequency-modulated and amplitude-modulated AC power for the main traction unit through the main power supply unit to supply the main traction unit with power; The DC power provided by the DC bus module is inverted into auxiliary traction three-phase frequency-amplitude-modulated AC power through the auxiliary traction unit to supply the operation of the first auxiliary traction unit and the second auxiliary traction unit; The DC power provided by the DC bus module is converted into column-supply DC power through the column-supply traction unit to operate the column-supply traction unit.

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