Traction converter

Abstract

The traction converter comprises a traction power supply system, an auxiliary power supply system and a train power supply system, wherein the traction power supply system is used for providing kinetic energy for traction for the locomotive; the auxiliary power supply system is integrated in the traction converter and is used for providing a power supply for a whole vehicle auxiliary circuit load; the train power supply system is integrated in the traction converter and is used for providing a power supply for locomotive auxiliary equipment; and the traction power supply system, the auxiliary power supply system and the train power supply system are independently powered by a transformer winding.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical dynamics, and in particular to a traction converter. Background Art

[0002] With the rapid development of rail transit technology and the rapidly growing demand for railway passenger and freight transportation, it has become a development trend to build safer, more reliable, economically advanced, energy-saving and environmentally friendly passenger and freight trains to achieve the goal of safe and reliable transportation. This has put forward higher requirements on the reliability, lightweight and miniaturization of traction inverters.

[0003] However, at present, most electric locomotives use traction, auxiliary and train supply systems that are physically separated in the locomotive and electrically connected through large wires and communication lines, resulting in large size and weight of the entire vehicle system, high design cost and low system reliability. Summary of the invention

[0004] The embodiments of the present application are intended to provide a traction converter.

[0005] The technical solution of this application is implemented as follows:

[0006] The embodiment of the present application provides a traction converter, including: a traction power supply system, an auxiliary power supply system and a train power supply system; wherein:

[0007] The traction power supply system is used to provide traction kinetic energy for the locomotive; the auxiliary power supply system is integrated in the traction inverter and is used to provide power for the auxiliary circuit load of the entire vehicle; the train power supply system is integrated in the traction inverter and is used to provide power for the locomotive auxiliary equipment; the traction power supply system, the auxiliary power supply system and the train power supply system are independently powered by transformer windings.

[0008] Optionally, each of the traction converters includes at least two of the traction power supply systems, one of the auxiliary power supply systems and one of the train power supply systems.

[0009] Optionally, the traction power supply system, the auxiliary power supply system and the train power supply system share the same water cooling system.

[0010] Optionally, the auxiliary power supply system includes a four-quadrant frequency converter and a sinusoidal pulse width modulator SPWM; the four-quadrant frequency converter and the sinusoidal pulse width modulator SPWM are used to control the operation of the auxiliary power supply system.

[0011] Optionally, the auxiliary power supply system includes a three-phase rectifier, which converts single-phase alternating current into three-phase alternating current under traction conditions to provide power for the auxiliary circuit load of the entire vehicle.

[0012] Optionally, the auxiliary power supply system includes at least two auxiliary inverters, one of which operates in a fixed frequency mode to supply power to a load operating at a constant frequency and constant voltage; and the other auxiliary inverter operates in a variable frequency mode to supply power to a load requiring variable frequency and voltage.

[0013] Optionally, the auxiliary power supply system has a redundancy function. When one of the auxiliary power supply units in the train power supply system fails, the other auxiliary power supply unit supplies power to the auxiliary circuit load of the entire vehicle.

[0014] Optionally, the train power supply system includes a four-quadrant PWM converter, which performs AC-DC conversion under traction conditions to provide DC power for locomotive auxiliary equipment.

[0015] Optionally, the train power supply system has a redundancy function. When one of the train power supply units in the train power supply system fails, the other train power supply unit supplies power to the locomotive auxiliary equipment.

[0016] Optionally, the auxiliary power supply system and the train power supply system share the same control unit chassis.

[0017] A traction inverter provided in an embodiment of the present application includes: a traction power supply system, an auxiliary power supply system and a train power supply system; wherein the traction power supply system is used to provide traction kinetic energy for the locomotive; the auxiliary power supply system is integrated in the traction inverter and is used to provide power for the auxiliary circuit load of the entire vehicle; the train power supply system is integrated in the traction inverter and is used to provide power for the auxiliary equipment of the locomotive; the traction power supply system, the auxiliary power supply system and the train power supply system are independently powered by transformer windings. By adopting the technical solution of the present application, the auxiliary power supply system and the train power supply system are integrated into the traction inverter, the electrical functions of the auxiliary power supply system and the train power supply system are compatible, the volume and weight of the entire vehicle system are reduced, the design cost is reduced, and the reliability of the system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a circuit structure of a traction converter provided in an embodiment of the present application;

[0019] Figure 2 A schematic structural diagram of a traction converter cabinet provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In addition, the accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0022] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the steps. For example, some steps may be decomposed, while some steps may be combined or partially combined, so the actual execution order may change according to the actual situation.

[0023] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0024] In some embodiments, see Figure 1 , Figure 1 A circuit structure diagram of a traction converter provided in an embodiment of the present application, the traction converter comprises: a traction power supply system 110, an auxiliary power supply system 120 and a train power supply system 130; wherein,

[0025] The traction power supply system 110 is used to provide traction kinetic energy for the locomotive; the auxiliary power supply system 120 is integrated in the traction inverter and is used to provide power for the auxiliary circuit load of the entire vehicle; the train power supply system 130 is integrated in the traction inverter and is used to provide power for the locomotive auxiliary equipment; the traction power supply system 110, the auxiliary power supply system 120 and the train power supply system 130 are independently powered by the transformer windings.

[0026] The traction inverter is an inverter installed in the traction main circuit of an electric locomotive or other locomotive equipped with an electric transmission device. The function of the traction inverter is to convert electrical energy between DC and AC, and to control and regulate various traction motors, thereby controlling the operation of the locomotive.

[0027] In this embodiment, the traction power supply system 110, the auxiliary power supply system 120 and the train power supply system 130 are integrated in the traction converter, and each power supply system is independently powered by the transformer winding, so that the traction power supply system 110, the auxiliary power supply system 120 and the train power supply system 130 can work independently. It should be noted that each power supply system uses MVB (Multifunction vehicle bus) and Ethernet network communication interface to communicate with the vehicle system, reducing the volume of the vehicle system.

[0028] In an optional embodiment, each traction converter includes at least two traction power supply systems, one auxiliary power supply system and one train power supply system.

[0029] Two traction power supply systems, one auxiliary power supply system and one train power supply system are all connected to the transformer windings, independently powered by the transformer windings, and respectively connected to the corresponding load devices. It should be noted that each traction converter can include four traction power supply systems, two auxiliary power supply systems and two train power supply systems. The specific number of traction power supply systems, auxiliary power supply systems and train power supply systems can be flexibly adjusted according to actual power supply needs and is not limited here.

[0030] In a preferred example, each traction converter includes two traction power supply systems, an auxiliary power supply system and a train power supply system.

[0031] In some embodiments, the traction power supply system, the auxiliary power supply system and the train power supply system share the same water cooling system.

[0032] Electrical components will generate heat loss during operation, causing the temperature of the components and the air in the cabinet to rise. If the temperature exceeds the limit that the components can withstand, it may cause insulation failure, functional failure, etc. Therefore, a suitable cooling method must be used to remove the heat generated by the inverter during operation to ensure the normal operation of the inverter and thus ensure the safe operation of the vehicle.

[0033] In this embodiment, forced water circulation cooling is adopted to cool the traction power supply system, auxiliary power supply system, train power supply system and other devices in the traction inverter, wherein the traction power supply system, auxiliary power supply system and train power supply system share the same water cooling system, thereby not only achieving the purpose of cooling each component, but also making full use of the water cooling system, thereby reducing the volume and mass of the whole vehicle system.

[0034] In some embodiments, the auxiliary power supply system includes a four-quadrant frequency converter and a sinusoidal pulse width modulator SPWM; the four-quadrant frequency converter and the sinusoidal pulse width modulator SPWM are used to control the operation of the auxiliary power supply system.

[0035] In the auxiliary power supply system, a four-quadrant inverter can be set. The four-quadrant inverter meets various industrial application requirements and is suitable for large inertia potential loads such as lifting equipment. The equipment has a large rotational inertia and is in a repeated short-term continuous working system. The deceleration from high speed to low speed is large, the braking time is short, and a strong braking effect is required or a long-term heavy-load electrical braking is required. Through four-quadrant pulse rectification control, the power saving effect of the auxiliary power supply system can be improved, the energy loss of the auxiliary circuit load braking process can be reduced, and the deceleration energy can be recovered and fed back to the power grid to achieve energy saving and environmental protection.

[0036] In addition, in this embodiment, the bidirectional flow of energy is also realized through the IGBT switch and the sinusoidal pulse width modulator SPWM, which can adjust the input power factor and eliminate the harmonic pollution to the power grid, making the four-quadrant inverter a real "green product". On the other hand, the energy generated by the motor feedback can be fed back to the power grid to achieve energy saving effect.

[0037] In some embodiments, the auxiliary power supply system includes a three-phase rectifier, which converts single-phase AC power into three-phase AC power under traction conditions to provide power for the auxiliary circuit load of the entire vehicle.

[0038] Compared with the single-phase rectifier circuit, the three-phase rectifier circuit can increase the power supply voltage of a larger power. Three-phase rectification mainly includes three-phase half-wave rectification and three-phase full-wave rectification. In the three-phase half-wave rectifier circuit, the input three-phase AC power is 120 degrees apart in phase. Each phase of the three-phase AC power and the corresponding diode constitute an independent half-wave rectifier circuit, and the three rectified output waveforms are superimposed on each other with a phase difference of 120 degrees. In the three-phase full-wave rectifier circuit, the waveform output by the rectifier diode will double and be superimposed on each other with a phase difference of 60 degrees. According to actual needs, a suitable three-phase rectifier can be selected to provide power for the auxiliary circuit load of the whole vehicle.

[0039] In some embodiments, the auxiliary power supply system includes at least two auxiliary inverters, one of which operates in a fixed frequency mode to supply power to loads operating at constant frequency and constant voltage; the other auxiliary inverter operates in a variable frequency mode to supply power to loads requiring variable frequency and voltage.

[0040] The function of the inverter is to convert DC power into AC power. It is usually composed of an inverter bridge, control logic and filter circuit.

[0041] In this embodiment, the inverter can adopt IGBT inverter output technology, which has overcurrent, short circuit, overvoltage, undervoltage, overload and other protection and alarm fault display functions, can ensure the safety of power load and variable frequency power supply, and has the characteristics of strong load adaptability, good output waveform quality, simple operation, small size, light weight, etc. One of the auxiliary inverters works in a fixed frequency mode to supply power to the load working at constant frequency and constant voltage; the other auxiliary inverter works in a variable frequency mode to supply power to the load with variable frequency and voltage requirements, thereby meeting the power supply needs of different types of loads.

[0042] In some embodiments, the auxiliary power supply system has a redundancy function. When one of the auxiliary power supply units in the train power supply system fails, the other auxiliary power supply unit supplies power to the auxiliary circuit load of the entire vehicle.

[0043] In this embodiment, each auxiliary power supply system may include multiple auxiliary power supply units, and different auxiliary power supply units are separated by contactors. When one or more auxiliary power supply units in the auxiliary power supply system fail, the faulty auxiliary power supply unit can be isolated by controlling the contactor of the circuit where the faulty auxiliary power supply unit is located. This will not affect the normal power supply and discharge of other auxiliary power supply units, thereby ensuring the normal operation of the locomotive system and improving system reliability.

[0044] In some embodiments, the train power supply system includes a four-quadrant PWM converter, which performs AC-DC conversion under traction conditions to provide DC power for locomotive auxiliary equipment.

[0045] In this embodiment, the four-quadrant PWM converter is used to convert the input AC power into DC output. At the same time, the four-quadrant PWM converter can also adapt to the needs of various complex working conditions, improve the power saving effect of the train power supply system, reduce the energy loss of providing power for locomotive auxiliary equipment, and achieve energy saving and environmental protection.

[0046] In some embodiments, the train power supply system has a redundancy function. When one of the train power supply units in the train power supply system fails, another train power supply unit supplies power to the locomotive auxiliary equipment.

[0047] In this embodiment, each train power supply system may include multiple train power supply units, and different train power supply units are separated by contactors. When one or more train power supply units in the train power supply system fail, the faulty train power supply unit can be isolated by controlling the contactor of the circuit where the faulty train power supply unit is located to disconnect, thereby not affecting the normal power supply and discharge of other train power supply units, thereby ensuring the normal operation of locomotive auxiliary equipment and improving system reliability.

[0048] In some embodiments, see Figure 2 , Figure 2 A schematic diagram of the structure of a traction converter cabinet provided in an embodiment of the present application. The auxiliary power supply system and the train power supply system share the same control unit chassis.

[0049] In this embodiment, the traction converter cabinet includes at least two complete traction shafts 210, an auxiliary power converter 230 and a train power converter 250, as well as an auxiliary power control unit 220 corresponding to the auxiliary power converter 230 and a train power control unit 240 corresponding to the train power converter 250, wherein the auxiliary power converter 230 is a part of the auxiliary power supply system, and the train power converter 250 is a part of the train power supply system. By integrating the auxiliary power supply system, the train power supply system, the auxiliary power supply control unit corresponding to the auxiliary power supply system, and the train power supply control unit corresponding to the train power converter into the traction converter cabinet, the volume and weight of the whole vehicle system are reduced, and the design cost is reduced.

[0050] The embodiment of the present application integrates the auxiliary power supply system and the train power supply system into the traction inverter, thereby making the electrical functions of the auxiliary power supply system and the train power supply system compatible, reducing the volume and weight of the entire vehicle system, reducing the design cost, and improving the reliability of the system.

[0051] In an optional embodiment, the voltage conversion mode of the auxiliary power supply system is AC-DC-AC, the rated input voltage is AC307V / 50Hz, the rated input current is 707A, the intermediate bus voltage is DC600V-DC650V, the switching frequency is 2150Hz, the inverter output voltage is 380V, the rated output current is 304A, the rated capacity is 230kVA, and the maximum capacity is 350kVA, wherein the auxiliary power supply system has the following electrical protection functions.

[0052] (1) Charging circuit and discharging circuit protection;

[0053] (2) Input overcurrent protection;

[0054] (3) Grid-side overvoltage and undervoltage protection;

[0055] (4) Rectifier and inverter module fault protection;

[0056] (5) Overvoltage and undervoltage protection of the intermediate DC circuit;

[0057] (6) Inverter output overcurrent, overload, overvoltage and undervoltage protection;

[0058] (7) Input, output and intermediate DC circuit grounding protection;

[0059] (8) Output phase loss or three-phase unbalance protection;

[0060] (9) Short circuit protection;

[0061] (10) Cooling system protection.

[0062] In another optional embodiment, the voltage conversion mode of the train power supply system is AC-DC, the rated input voltage is AC307V / 50Hz, the rated input current is 1061A, the intermediate bus voltage is DC600V, the switching frequency is 4000Hz, the rated output current is 334A, the rated capacity is 200kVA, and the maximum capacity is 300kVA, wherein the train power supply system has the following electrical protection functions.

[0063] (1) Input overcurrent protection;

[0064] (2) Input overvoltage and undervoltage protection;

[0065] (3) Output overvoltage and undervoltage protection;

[0066] (4) Output overcurrent protection;

[0067] (5) Provide four-quadrant module protection;

[0068] (6) Charge and discharge protection;

[0069] (7) Protection of related contactor opening and closing;

[0070] (8) Input and output grounding protection;

[0071] (9) It should have short-term overload capacity, and the starting of motor loads should be considered. It should be able to operate normally when the motor load is suddenly added / cut off, and no shutdown should occur;

[0072] (10) It should be able to work normally under no-load, light load and rated load;

[0073] (11) It should have self-checking function, electronic control fault detection and output isolation function.

[0074] The electrical protection functions of the auxiliary power supply system and the train power supply system can be realized by setting corresponding protection circuits or electrical devices. For example, for the protection of the charging circuit and the discharging circuit, it can be realized by isolating them through contactors; for input overcurrent protection, it can be realized by setting fast fuses, overcurrent relays, overload relays, DC fast circuit breakers, etc. in the corresponding circuits; for grid-side overvoltage and undervoltage protection, it can be realized by setting undervoltage protection circuits.

[0075] The embodiment of the present application analyzes the main circuit functions of the auxiliary and train power supply systems, system technical parameters, control and protection functions, low-voltage communication interfaces, cabinet installation requirements, etc., and simplifies the hardware design of the auxiliary power supply control unit and the train power supply control unit. A unified control unit chassis is used, which is conducive to the miniaturization and lightweight design of the traction inverter, reduces the volume and weight of the entire vehicle system, reduces the design cost, and improves the reliability of the system.

[0076] In the several embodiments provided in this application, it should be understood that the disclosed traction converter can be implemented in other ways. The system embodiments described above are merely illustrative.

[0077] The traction converter described in the embodiment of the present application is only taken as an example of the embodiment of the present application, but is not limited to this. As long as it involves the traction converter, it is within the protection scope of the present application.

[0078] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0079] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0080] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A traction converter, characterized in that: include: Traction power supply system, auxiliary power supply system and train power supply system; among them, The traction power supply system is used to provide traction kinetic energy for the locomotive; The auxiliary power supply system is integrated in the traction inverter and is used to provide power for the auxiliary circuit load of the entire vehicle; the train power supply system is integrated in the traction inverter and is used to provide power for locomotive auxiliary equipment; the traction power supply system, the auxiliary power supply system and the train power supply system are independently powered by transformer windings.

2. The traction converter according to claim 1, characterized in that: Each of the traction converters includes at least two of the traction power supply systems, one of the auxiliary power supply systems and one of the train power supply systems.

3. The traction converter according to claim 1, characterized in that: The traction power supply system, the auxiliary power supply system and the train power supply system share the same water cooling system.

4. The traction converter according to claim 1, characterized in that: The auxiliary power supply system includes a four-quadrant frequency converter and a sinusoidal pulse width modulator SPWM; the four-quadrant frequency converter and the sinusoidal pulse width modulator SPWM are used to control the operation of the auxiliary power supply system.

5. The traction converter according to claim 1, characterized in that: The auxiliary power supply system includes a three-phase rectifier, which converts single-phase alternating current into three-phase alternating current under traction conditions to provide power for the auxiliary circuit load of the entire vehicle.

6. The traction converter according to claim 1, characterized in that: The auxiliary power supply system includes at least two auxiliary inverters, one of which operates in a fixed frequency mode to supply power to loads operating at constant frequency and constant voltage; the other auxiliary inverter operates in a variable frequency mode to supply power to loads requiring variable frequency and voltage.

7. The traction converter according to claim 1, characterized in that: The auxiliary power supply system has a redundancy function. When one of the auxiliary power supply units in the train power supply system fails, the other auxiliary power supply unit supplies power to the auxiliary circuit load of the entire vehicle.

8. The traction converter according to claim 1, characterized in that: The train power supply system includes a four-quadrant PWM converter, which performs AC-DC conversion under traction conditions to provide DC power for locomotive auxiliary equipment.

9. The traction converter according to claim 1, characterized in that: The train power supply system has a redundancy function. When one of the train power supply units in the train power supply system fails, the other train power supply unit supplies power to the locomotive auxiliary equipment.

10. The traction converter according to claim 1, characterized in that: The auxiliary power supply system and the train power supply system share the same control unit chassis.

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