Converter supporting flexible configuration of topological structure

Abstract

The embodiment of the invention relates to the technical field of rail transit, and discloses a converter device supporting flexible configuration of a topological structure, which comprises a converter system and a converter cabinet, the converter system comprises a topological structure module, a transmission control unit, a direct current loop, an input unit, a support capacitor, an output current detection unit or an output isolation contactor; the converter cabinet is of a cuboid structure, the height of the cuboid structure is larger than the length or width, the cuboid structure comprises an outer frame, an inner frame and an outer surface panel, the outer surface panel is arranged outside the outer frame and used for forming a closed space, and the inner frame is arranged in the closed space; the inner frame comprises a cross beam plane, and the cross beam plane divides the closed space into a plurality of small spaces which are respectively used for placing each unit in the converter system. According to the topological structure module provided by the invention, the modularization of the converter device and the miniaturization of the whole structure are realized.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of rail transit, and particularly to a variable current device supporting flexible configuration of topological structures. Background Art

[0002] Currently, the traction variable current devices of main line locomotives at home and abroad are generally installed in the machinery compartment of the locomotive. There is a corridor in the center of the machinery compartment for the crew to pass through, and the traction variable current devices are arranged on both sides of the machinery compartment. Usually, the width and height dimensions of locomotives are generally similar, so the maximum width and height dimensions that can be obtained by the variable current devices installed in the machinery compartment are also basically similar. To meet the functional requirements of different locomotives, the traction variable current device generally obtains the desired necessary space dimensions by adjusting the occupied dimension in the length direction.

[0003] Generally, a single locomotive traction device includes several variable current systems, and each variable current system is used to drive a traction motor, including a four-quadrant rectifier, an intermediate DC circuit support capacitor, an inverter, an overvoltage suppression chopper, etc.

[0004] The power unit of the variable current system is the core for realizing electrical functions, is also the component that occupies the most space in the device, and is also the main object for heat dissipation consideration. The existing forms of power units are diverse, with their own advantages and disadvantages. Moreover, the modular design degree of the variable current system is low, and the product development efficiency is not high.

[0005] Therefore, how to improve the modularity of the variable current system under different topological structures is an urgent problem to be solved at present. Summary of the Invention

[0006] The purpose of the embodiments of the present invention is to provide at least a variable current device supporting flexible configuration of topological structures, which can at least solve the modularity problem of the variable current system under different topological structures and can at least meet the functional requirements of different locomotives.

[0007] To solve the above technical problems, at least one embodiment of the present application provides a variable current device supporting flexible configuration of topological structures, including a variable current system and a variable current cabinet. The variable current system is installed in the variable current cabinet. The variable current system includes a topological structure module, a drive control unit, a DC circuit, an input unit, a support capacitor, an output current detection unit, or an output isolation contactor; the variable current cabinet is in a cuboid structure, the height of the cuboid structure is greater than the length or width, and it includes an outer frame, an inner frame, and an outer surface panel. The outer surface panel is arranged outside the outer frame to form a closed space, and the inner frame is arranged in the closed space formed by the outer frame and the outer surface panel; the inner frame includes a crossbeam plane, and the crossbeam plane divides the closed space into several small spaces, which are respectively used to place each unit in the variable current system, integrating rectification, inversion, power charging machine, and chopping functions. By replacing the program, the interchange of different rectification, inversion, and charging / chopping functions can be conveniently realized.

[0008] An AC-DC conversion device supporting flexible configuration of the topological structure provided by an embodiment of the present application, compared with the prior art, adopts a modular design with different topological structures to meet the power requirements of different locomotives, realizes efficient utilization of the device space, and makes the overall device miniaturized by making full use of the structural characteristics of the AC-DC conversion device.

[0009] In addition, the topological structure module includes: at least one single-phase PWM rectification unit, an INV inversion unit, and a support capacitor. The DC low-inductance busbar is a flat structure. The support capacitor is installed on one surface of the DC low-inductance busbar, and the INV inversion unit and at least one single-phase PWM rectification unit are arranged side by side on the other surface of the low-inductance busbar. By modularizing the topological structure, the overall miniaturization of the AC-DC conversion device is realized. The use of the DC low-inductance busbar greatly reduces the stray inductance of the circuit and reduces the overvoltage during the operation of the device.

[0010] In addition, the outer frame includes: outer vertical beam components, inclined beam components, top cross beam components, and bottom cross beam components. The inclined beam components and the top cross beam components are connected to form a top frame. The top frame is connected to the top ends of the outer vertical beam components. The main frame is connected to the bottom cross beam components to form a main frame with a cuboid structure. The sizes of the inclined beam components, the top cross beam components, and the bottom cross beam components are all smaller than the sizes of the outer vertical beam components; the bottom cross beam components form the bottom surface of the main frame. The use of the frame structure facilitates the overall miniaturization of the AC-DC conversion device.

[0011] In addition, the outer vertical beam components include four vertical beams, which are respectively arranged on the four sides in the height direction of the cuboid, and the lengths of the two vertical beams located on the front side of the main frame are greater than the lengths of the two vertical beams on the rear side; the inclined beam components include two inclined beams, forming an inclined top surface; one end of the first inclined beam is connected to one end of the first vertical beam on the rear side, and the other end is connected to the top end of the third vertical beam on the front side of the main frame through the top cross beam component; one end of the second inclined beam is connected to one end of the second vertical beam on the rear side, and the other end is connected to the top end of the fourth vertical beam on the front side through the top cross beam component. The beam structure of the main frame further ensures the overall miniaturization of the AC-DC conversion device.

[0012] In addition, the inner frame includes five inner cross beam planes and a first group of inner vertical beams. The first group of inner vertical beams includes two parallel inner vertical beams, one of which is located inside the left side surface of the main frame, and the other is located inside the right side surface of the main frame. The plane formed by the first group of inner vertical beams is parallel to the front side surface and the rear side surface of the main frame, forming a first inner vertical surface; the left side edge of each inner cross beam plane is connected to the left side surface of the main frame, and its right side edge is connected to the right side surface of the main frame; the five inner cross beam planes are used to divide the main frame into several areas for respectively placing each unit in the AC-DC conversion system. The inner frame divides the internal area of the main frame, reasonably plans the space, and ensures the overall miniaturization of the AC-DC conversion device.

[0013] In addition, the first inner crossbeam plane is located at the top. Its front side is connected to the front side of the main frame, and its rear side is connected to the rear side of the main frame. A first space is formed between the first inner crossbeam plane and the top frame, which is used to arrange the drive control unit of the converter system. Placing the drive control unit at the top facilitates control operations.

[0014] In addition, the part of the second inner crossbeam plane located below the first inner crossbeam plane. Its front side is connected to the front side of the main frame, and its rear side is connected to the first inner vertical surface. A second space is formed between the first crossbeam plane and the second crossbeam plane, which is used to place the main water outlet pipeline in the water-cooling unit of the converter system. Reasonably planning the water pipe pipeline provides a guarantee for the overall miniaturization of the converter device.

[0015] In addition, the third inner crossbeam plane is located below the second inner crossbeam plane. Its front side is connected to the front side of the main frame, and its rear side is connected to the first inner vertical surface. A third space is formed between the second inner crossbeam plane and the third inner crossbeam plane, which is used to place the INV inverter unit and at least one single-phase PWM rectifier unit in the topology structure module. Concentrating the power units further ensures the overall miniaturization of the converter device.

[0016] In addition, the other part of the fourth inner crossbeam plane located below the first inner crossbeam plane. Its rear side is connected to the rear side of the main frame, and its front side is connected to the first inner vertical surface. The fourth inner crossbeam plane is lower than the third inner crossbeam plane. A fourth space is formed between the first inner crossbeam plane and the fourth inner crossbeam plane, which is used to place the support capacitor in the topology structure module; a sixth space is formed between the fourth inner crossbeam plane and the bottom crossbeam assembly, which is used to arrange the power resistor of the converter system. Laying the support capacitor and the power resistor in layers ensures the reasonable planning of the components of the converter system.

[0017] In addition, the inner frame further includes a second group of inner vertical beams. The second group of inner vertical beams includes two parallel inner vertical beams. One of the inner vertical beams is located inside the left side surface of the main frame, and the other inner vertical beam is located inside the right side surface of the main frame. The second inner vertical surface formed by the second group of inner vertical beams is parallel to the front side surface and the rear side surface of the main frame. The second inner vertical surface is disposed between the first inner vertical surface and the front side surface of the main frame. The part of the fifth inner crossbeam plane below the third inner crossbeam plane is lower than the fourth inner crossbeam plane. Its rear side is connected to the second inner vertical surface, and its front side is connected to the front side surface of the main frame. A fifth space is formed between the fourth inner crossbeam plane and the fifth inner crossbeam plane for arranging the four-quadrant input current sensor and the inverter output current sensor of the converter system, the charging contactor, the short-circuit contactor of the converter device, or / and the inverter isolation contactor. The space behind the sensor is for arranging the main water inlet pipeline in the water cooling unit of the converter system. A seventh space is formed between the fifth inner crossbeam plane and the bottom crossbeam assembly for arranging the high-voltage terminal of the main circuit interface of the converter device. This facilitates the external wiring, installation, disassembly of the converter. Description of the Drawings

[0018] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0019] Figure 1 is a schematic structural diagram of a drive control unit in a converter system according to an embodiment of the present invention;

[0020] Figure 2 is a schematic circuit structure diagram of a converter system according to an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of a topology structure module according to an embodiment of the present invention;

[0022] Figure 4 is a schematic circuit structure diagram of a converter cabinet according to an embodiment of the present invention;

[0023] Figure 5 is a schematic circuit structure diagram of a converter system according to an embodiment of the present invention;

[0024] Figure 6 is a schematic circuit structure diagram of a converter system according to an embodiment of the present invention;

[0025] Figure 7 is a schematic combined structure diagram of a converter device according to an embodiment of the present invention. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will elaborate on various embodiments of the present invention with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in various embodiments of the present invention, many technical details are provided to help readers better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present invention can still be implemented.

[0027] Embodiment 1:

[0028] An embodiment of the present invention relates to a variable frequency converter that supports flexible configuration of the topology structure.

[0029] Compared with the prior art, the embodiment of the present invention adopts a topology structure module to modularize the power devices in the variable frequency conversion system, thereby solving the heat dissipation problem of the power unit in the variable frequency conversion system, improving the development efficiency of the variable frequency converter, meeting the topology requirements of different functional traction variable frequency converters, and making the overall variable frequency converter smaller by taking full advantage of the structural characteristics of the variable frequency converter.

[0030] The following specifically describes the implementation details of... in this embodiment. The following content is only provided for the convenience of understanding and is not necessary for implementing this solution.

[0031] A variable frequency converter that supports flexible configuration of the topology structure, as Figure 1 shown, includes multiple variable frequency conversion systems with the same structure. Each variable frequency conversion system includes a drive control unit TCUi. The drive control unit is used to, according to the train operation instruction, comprehensively consider sensor information, the status information of each component, and wheel-rail conditions, etc., and convert the energy from the power grid into the train operation traction force in real time and efficiently, driving the train to run safely and comfortably. According to the different number of axles configured in the main variable frequency converter, configure the corresponding number of drive control units. Each drive control unit can complete the control of one four-quadrant + one inverter in the main circuit; the management unit receives the diagnostic data of each drive control unit, summarizes it, and sends out the information related to the diagnosis of the main variable frequency converter externally; each drive control unit has a dual Ethernet interface externally and is connected to the communication network externally to achieve dual Ethernet redundant communication; the CAN communication network is used inside each drive control unit, and the diagnostic information of each drive control unit is sent to the main control management unit through the CAN.

[0032] In a specific embodiment of the present application, in a variable frequency conversion system with a topology structure, as Figure 2As shown, it includes an input unit 1, a single-phase PWM rectifier unit (4QC1A) 2, a single-phase PWM rectifier unit (4QC2A) 3, a support capacitor 4, a DC link 5, an INV inverter unit 6, an output current detection unit 7, an output isolation contactor 8, and a drive control unit 10. The input unit 1, two single-phase PWM rectifier units, the support capacitor 4, the DC link 5, the INV inverter unit 6, the output current detection unit 7, and the output isolation contactor 8 are connected in sequence. The drive control unit (TCU1) 10 is respectively connected to the input unit 1, one or two single-phase PWM rectifier units, the support capacitor 4, the DC link 5, the INV inverter unit 6, the output current detection unit 7, and the output isolation contactor 8, and is used to control each unit to realize the drive of the traction motor 9.

[0033] 4QC1 includes 2 IGBT switch bridge arms connected in parallel and used as phase A of the four-quadrant rectifier; 4QC2 adds an IGBT switch bridge arm on the basis of 4QC1. Among them, 2 IGBT switch bridge arms are connected in parallel and used as phase X of the four-quadrant rectifier, and the other switch bridge arm is connected to a braking or chopping resistor to suppress the overvoltage of the intermediate DC link; INV includes 3 IGBT switch bridge arms as an inverter to invert the DC voltage of the intermediate DC link into a three-phase AC voltage with adjustable amplitude and frequency to control the traction motor. Additionally, when 4QC1 is designed to be the same as 4QC2, the other bridge arm can be used as a chopping unit, such as the charging function of the power battery, so that function expansion can be realized while ensuring the interface remains unchanged.

[0034] Multiple converter systems with the same structure include converter system 11, converter system 12, and converter system 13. The input units of each converter system are respectively connected to different secondary side windings of the traction transformer. The control units in each converter system transmit signals through Ethernet, and through coordinated control of symmetrical phase shift, the lowest line-side harmonic content is achieved. Each converter system realizes the capacity expansion of the converter power to meet the requirements of vehicle operation.

[0035] The input circuit 1 is a charging circuit composed of a charging contactor and a charging resistor, which realizes the complete consistency of the two single-phase PWM rectifiers in terms of mechanical interface and electrical interface. The difference is that the single-phase PWM rectifier 2 mainly includes two functions of four-quadrant rectification and DCDC bidirectional conversion, and the single-phase PWM rectifier 3 mainly includes two functions of four-quadrant rectification and chopping. Among them, the DCDC bidirectional converter is applicable to systems with power battery devices and can realize coordinated power supply of different power supply systems.

[0036] Through the DCDC bidirectional converter in the single-phase PWM rectifier 2, power supply from the power battery under traction conditions can be realized, and charging of the power battery under braking conditions or under catenary power supply can be realized.

[0037] The support capacitor 4 is used to stabilize the DC voltage of the intermediate circuit of the converter and exchange the reactive power between the transformer side and the motor side.

[0038] The voltage detection unit mainly detects the intermediate circuit voltage and implements closed-loop control through the drive control unit to achieve the stability of the DC voltage of the intermediate circuit.

[0039] The grounding detection circuit mainly judges the characteristic values through the drive control unit based on the change value of the half voltage to realize the grounding judgment of the input side, the intermediate DC circuit, and the inverter output side of the traction converter.

[0040] The three-phase VVVF (INV) inverter device of the motor mainly converts DC power into three-phase alternating current with adjustable voltage and frequency to drive the traction motor 9. When driving a three-phase asynchronous traction motor, an isolation contactor does not need to be set; when driving a permanent magnet synchronous traction motor, an isolation contactor 8 needs to be set to cut off the path between the inverter and the permanent magnet motor in the fault mode to avoid the influence of the back electromotive force of the permanent magnet motor on the inverter.

[0041] In a specific embodiment of the present application, a topology structure converter system includes an input unit, at least one single-phase PWM rectification unit, a support capacitor, a DC circuit, an INV inversion unit, an output current detection unit, and a drive control unit. The input unit, one or two single-phase PWM rectification units, the support capacitor, the DC circuit, the INV inversion unit, and the output current detection unit are connected in sequence. The drive control unit is respectively connected to the input unit, one or two single-phase PWM rectification units, the support capacitor, the DC circuit, the INV inversion unit, the output isolation contactor, and the output current detection unit for controlling each unit.

[0042] The topology structure module includes at least one single-phase PWM rectification unit, an INV inversion unit, and a support capacitor. The DC low-inductance busbar is a flat structure. The support capacitor is installed on one surface of the DC low-inductance busbar, and the INV inversion unit and at least one single-phase PWM rectification unit are installed side by side on the other surface of the low-inductance busbar. The INV inversion unit includes 6 IGBTs, and the 6 IGBTs are arranged in a three-bridge arm structure.

[0043] The single-phase PWM rectification unit includes 4 IGBTs or 6 IGBTs. The 4 IGBTs are arranged in a two-bridge arm structure, and the 6 IGBTs are arranged in a three-bridge arm structure.

[0044] The single-phase PWM rectification unit and the INV inversion unit have the same structural dimensions.

[0045] Embodiments of the present invention provide a variable current device that supports flexible configuration of the topological structure, including: a variable current system and a variable current cabinet. The variable current system is installed in the variable current cabinet and includes a topological structure module, a drive control unit, a DC circuit, an input unit, a support capacitor, an output current detection unit, or an output isolation contactor.

[0046] The variable current cabinet is in a cuboid structure. The height of the cuboid structure is greater than the length or width. It includes an outer frame, an inner frame, and an outer surface panel. The outer surface panel is arranged outside the outer frame to form a closed space. The inner frame is arranged in the closed space formed by the outer frame and the outer surface panel. The crossbeam plane in the inner frame divides the closed space into several small spaces, which are respectively used to place each unit in the variable current system.

[0047] The uppermost first space in the closed space is used to place the drive control unit of the variable current system.

[0048] Part of the space below the first space is the second space, which is used to place the main outlet water pipeline in the water-cooling unit of the variable current system.

[0049] The third space below the second space is used to place the INV inverter unit and at least one single-phase PWM rectifier unit in the topological structure module.

[0050] Another part of the space below the first space, the fourth space, is used to place the support capacitor in the topological structure module.

[0051] The fifth space below the third space is used to set the four-quadrant input current sensor and the inverter output current sensor of the variable current system. The space behind the sensors is used to set the main inlet water pipeline in the water-cooling unit of the variable current system.

[0052] The sixth space below the fourth space is used to set the power resistors of the variable current system, including a charging resistor and a chopping resistor.

[0053] The seventh space below the fifth space is used to set the high-voltage terminals of the main circuit interface of the variable current system, including four-quadrant input and inverter output terminals, and the number and position can be increased, decreased, and adjusted according to actual needs.

[0054] The outer frame includes outer vertical beam components, inclined beam components, top crossbeam components, and bottom crossbeam components. The inclined beam components and the top crossbeam components are connected to form a top frame. The top frame is connected to the top ends of the outer vertical beam components. The outer vertical beam components are connected to the bottom crossbeam components to form the main frame of the cuboid structure. The sizes of the inclined beam components, the top crossbeam components, and the bottom crossbeam components are smaller than the sizes of the outer vertical beam components.

[0055] The outer vertical beam assembly includes four vertical beams, which are respectively arranged on the four sides in the height direction of the cuboid, and the lengths of the two vertical beams on the front side are greater than the lengths of the two vertical beams on the rear side; the inclined beam assembly includes two parallel inclined beams, forming an inclined top surface; one end of the first inclined beam is connected to one end of the first vertical beam on the rear side of the main frame, and the other end is connected to the top of the third vertical beam on the front side of the main frame through the top cross beam assembly; one end of the second inclined beam is connected to one end of the second vertical beam on the rear side of the main frame, and the other end is connected to the top of the fourth vertical beam on the front side of the main frame through the top cross beam assembly.

[0056] The top cross beam assembly includes two top cross beams and two top side beams. The first top cross beam, the first top side beam, the second top cross beam, and the second top side beam are connected end to end to form a first rectangle, forming the top surface of the main frame. One end of the first top side beam is connected to the other end of the first inclined beam, and the other end of the first top side beam is connected to one end of the third vertical beam on the front side of the main frame. One end of the second top side beam is connected to the other end of the second inclined beam, and the other end of the second top side beam is connected to one end of the fourth vertical beam on the front side of the main frame.

[0057] The bottom cross beam assembly includes two bottom cross beams and two bottom side beams. The first bottom cross beam, the first bottom side beam, the second bottom cross beam, and the second bottom side beam are connected end to end to form a second rectangle, forming the bottom surface of the main frame. One end of the first bottom side beam is connected to the bottom end of the first vertical beam on the rear side of the main frame, and the other end of the first bottom side beam is connected to the bottom end of the third vertical beam on the front side of the main frame. One end of the second bottom side beam is connected to the bottom end of the second vertical beam on the rear side of the main frame, and the other end of the second bottom side beam is connected to the bottom end of the fourth vertical beam on the front side of the main frame.

[0058] The top surface of the main frame is parallel to the bottom surface of the main frame.

[0059] The inner frame includes an inner vertical beam assembly and an inner cross beam plane assembly. The inner vertical beam assembly includes two groups of inner vertical beam assemblies. Each group of inner vertical beams includes two inner vertical beams. One of the inner vertical beams in each group is located on the left side of the main frame, and the other inner vertical beam is located on the right side of the main frame.

[0060] One end of the first inner vertical beam in the first group of inner vertical beams is connected to one end of the first top side beam near the first transverse side beam, and the other end is connected to one end of the first bottom side beam in the main frame near the first bottom cross beam; one end of the second inner vertical beam in the first group of inner vertical beams is connected to one end of the second top side beam near the first top cross beam, and the other end is connected to one end of the second bottom side beam near the first bottom cross beam. The first vertical beam, the first inner vertical beam, and the third vertical beam form the left side of the main frame, and the second vertical beam, the second inner vertical beam, and the fourth vertical beam form the right side of the main frame. The first inner vertical beam and the second inner vertical beam are arranged in parallel to form the first inner vertical plane. The first inner vertical plane is located between the front side and the rear side of the main frame, is perpendicular to the left side and the right side of the main frame respectively, and is parallel to the front side and the rear side of the main frame.

[0061] The inner cross beam plane assembly includes five inner cross beam planes, and each inner cross beam plane is parallel to the bottom surface of the cuboid. From top to bottom, they are the first inner cross beam plane to the fifth inner cross beam plane.

[0062] Each inner cross beam plane includes two cross beams, two side beams, and at least one inner beam. The two cross beams and the two side beams are connected end to end to form a rectangle. One cross beam forms the front side edge of the rectangle, and one cross beam forms the rear side edge of the rectangle. The two side beams form the left side edge and the right side edge of the rectangle. The left side edge of each inner cross beam plane is connected to the left side of the main frame, and the right side edge of each inner cross beam plane is connected to the right side of the main frame; the inner beam is connected between the two cross beams and is parallel to the side beam; or the inner beam is connected between the two side beams and is parallel to the cross beam; or the inner beam is connected between one side beam and the adjacent cross beam.

[0063] The front side edge of the first inner cross beam plane is connected to the front side of the main frame, and the rear side edge is connected to the rear side of the main frame.

[0064] On the surface of the first inner cross beam plane facing the top cross beam assembly, a first flat plate is installed, and in the first space formed between the inner cross beam plane and the top cross beam assembly, a drive control unit of the converter system is arranged.

[0065] The second inner cross beam plane is arranged in a partial area below the first inner cross beam plane and includes at least two inner beams. One end of the seventh cross beam in the second inner cross beam plane is connected to the fifth vertical beam, the front side edge of the second inner cross beam plane is connected to the front side of the main frame, and the rear side edge is connected to the first inner vertical plane.

[0066] A second space is formed between a part of the first inner cross beam plane and the second inner cross beam plane. The second space is located below a part of the first space and is used to arrange the main water outlet pipeline in the water cooling unit of the converter system.

[0067] The third inner crossbeam plane is arranged below the second inner crossbeam plane, and its structure is the same as that of the second inner crossbeam plane. The front side edge of the second inner crossbeam plane is connected to the front side of the main frame, and its rear side edge is connected to the first inner vertical surface.

[0068] A third space is formed between the second inner crossbeam plane and the third inner crossbeam plane. The third space is located directly below the second space. A fourth space is formed between the part where the first inner crossbeam plane extends beyond the second inner crossbeam plane and the fourth inner crossbeam plane. The fourth inner crossbeam plane is arranged below the first inner crossbeam plane and lower than the third inner crossbeam plane. The third space and the fourth space are used to arrange the topology structure module, and the support capacitor is located in the fourth space, and the INV inverter unit and one or two single-phase PWM rectifier units are located in the third space.

[0069] A fifth space is formed between the third inner crossbeam plane and the fifth inner crossbeam plane. The fifth space is located below the third space. Below the third inner crossbeam plane, immediately adjacent to the position of the third inner crossbeam plane close to the front side of the main frame, a four-quadrant input current sensor and an inverter output current sensor of the conversion system are arranged. In the space behind the sensor, the main water inlet pipeline in the water cooling unit of the conversion system is arranged; on the fifth inner crossbeam plane, in the case of an asynchronous electrode, it is used to arrange the charging contactor and the short-circuit contactor of the conversion system; or in the case of a synchronous electrode, it is used to arrange the charging contactor, the short-circuit contactor and the inverter isolation contactor of the conversion system.

[0070] The space formed between the fourth inner crossbeam plane and the bottom crossbeam assembly is the sixth space. The sixth space is located below the fourth space and is used to arrange the power resistors of the conversion system, including the charging resistor and the chopping resistor.

[0071] The fifth inner crossbeam plane is arranged below the third inner crossbeam plane and lower than the fourth inner crossbeam plane. The space formed between the fifth inner crossbeam plane and the bottom crossbeam assembly is the seventh space, which is used to arrange the high-voltage terminals of the main circuit interface of the conversion system, including the four-quadrant input and inverter output terminals, and the quantity and position can be increased or decreased and adjusted according to actual needs.

[0072] A vertical plate is arranged between the third inner vertical beam and the fourth inner vertical beam in the second group of inner vertical beams. The fourth flat plate is arranged perpendicular to the fifth inner crossbeam plane and is located below the fifth inner crossbeam plane. The fourth flat plate, the fifth inner crossbeam plane and the low crossbeam assembly form the seventh space, and the seventh space is located below the fifth space. The high-voltage terminals of the main circuit interface of the conversion system, including the four-quadrant input and inverter output terminals, are arranged on the vertical plate, and the quantity and position can be increased or decreased and adjusted according to actual needs.

[0073] A conversion device supporting flexible configuration of the topology structure provided by this embodiment uses an inner frame to divide the enclosed space and has a reasonable layout, so that it can be installed in the conversion cabinet under different topology structures.

[0074] Embodiment 2

[0075] The implementation mode of the present invention is a detailed description of the above specific Embodiment 1. Refer to Figure 3 and Figure 6 .

[0076] The topology structure module, such as Figure 3 shown, the DC low-inductance busbar 25 is a flat structure and is arranged in the middle. Figure 2 The first single-phase PWM rectification unit (4QC1A) 21, the second single-phase PWM rectification unit (4QC2A) 22 and the INV inverter 23 in

[0077] are arranged in parallel on one surface of the DC low-inductance busbar 25, and the first single-phase PWM rectification unit (4QC1A) 21, the second single-phase PWM rectification unit (4QC2A) 22 and the INV inverter 23 have the same size and their positions can be set arbitrarily. The support capacitor 24 is arranged on the other surface of the DC low-inductance busbar 25. The IGBT commutation path from the support capacitor to the inside of the module is short, and excellent electrical performance improvement can be obtained.

[0078] A variable frequency device supporting flexible configuration of the topology structure according to the present application, such as Figure 4 , Figure 5 , Figure 6 shown, in which Figure 4 is the front view of the main frame, Figure 5 is the left view of the main frame, Figure 6 is the rear view of the main frame. The main frame is fixedly installed and has high structural strength.

[0079] The top crossbeam assembly includes top crossbeams 30, 38, 43, and the last top crossbeam. The last top crossbeam is arranged opposite to the top crossbeam 38 and is not labeled in the figure. The top crossbeams 30, 38, 43, and the last top crossbeam are connected in sequence to form the top surface of the main frame in a rectangular structure at the top.

[0080] The outer vertical beam assembly includes four vertical beams 31 / 33 / 41 / 44, which are used to form the height of a cuboid. The vertical beams 41 and 44 are located on both sides of the front side of the main frame of the cuboid, and the vertical beams 31 and 33 are located on both sides of the rear side of the main frame of the cuboid. Moreover, the lengths of the two vertical beams 41 / 44 on the front side are greater than the lengths of the two vertical beams 31 / 33 on the rear side. The lengths of the four vertical beams are all greater than the length of the top crossbeam assembly, the length of the diagonal beam assembly, and the length of the inner crossbeam plane.

[0081] The diagonal beam assembly includes a diagonal beam 39 and another diagonal beam symmetrically arranged with the diagonal beam 39, which is not shown in the figure.

[0082] One end of the diagonal beam 39 is connected to the top of the vertical beam 33, and the other end is connected to one end of the top crossbeam 38. The other end of the top crossbeam 38 is connected to the top of the vertical beam 41. The diagonal beam 39, the vertical beam 33, the top crossbeam 38, and the vertical beam 44 form the left side of the main frame.

[0083] The structure of the other diagonal beam is the same as that of the diagonal beam 39, and it forms the right side of the main frame with the vertical beam 31, the last top crossbeam, and the vertical beam 41.

[0084] The diagonal beam assembly forms the slanted top surface of the cuboid, and the diagonal beam assembly and the top crossbeam assembly form the entire top surface of the cuboid.

[0085] The bottom crossbeam assembly includes bottom crossbeams 36, 37, 42, and the last bottom crossbeam. The last bottom crossbeam is arranged opposite to the bottom crossbeam 37 and is not marked in the figure. The bottom crossbeams 36, 37, 42, and the last bottom crossbeam are connected in sequence to form the bottom surface of the main frame of the bottom rectangular structure.

[0086] The inner frame includes two groups of inner vertical beam assemblies and an inner crossbeam plane assembly. The two groups of inner vertical beam assemblies include inner vertical beams 45 and 46. The inner vertical beams 45 and 46 are located in the left side of the main frame, and another inner vertical beam corresponding to the inner vertical beam 45 is located in the right side of the main frame. Similarly, another inner vertical beam corresponding to the inner vertical beam 46 is also located in the right side of the main frame.

[0087] One end of the inner vertical beam 45 is connected to a top crossbeam, and the other end is connected to a bottom crossbeam.

[0088] One end of the inner vertical beam 46 is connected to the fifth inner crossbeam plane, and the other end is connected to a bottom crossbeam.

[0089] The inner vertical beam 45 and another inner vertical beam parallel to the inner vertical beam 45 form the first inner vertical surface, and the inner vertical beam 46 and another inner vertical beam parallel to the inner vertical beam 46 form the second inner vertical surface.

[0090] The inner crossbeam plane assembly includes five inner crossbeam planes, each of which is arranged in parallel within a cuboid. The left side of each inner crossbeam plane is connected to the left side of the main frame of the cuboid, and its right side is connected to the right side of the main frame of the cuboid.

[0091] Each inner crossbeam plane is a rectangular structure, including a front side, a rear side, a left side, and a right side. A number of inner beams are arranged between the front side and the rear side, and both ends of each inner beam are respectively connected to the front side and the rear side. Or a number of inner beams are arranged between the left side and the right side, and both ends of each inner beam are respectively connected to the left side and the right side. Or a number of inner beams are arranged between the front side and the right side, and both ends of each inner beam are respectively connected to the front side and the right side. For the inner beam structures in other ways, the same can be inferred and will not be elaborated here.

[0092] The first inner crossbeam plane 34 is located at the topmost. Its front side is connected to the front side of the main frame of the cuboid, and its rear side is connected to the rear side of the main frame of the cuboid. The first inner crossbeam plane 34 and the full top surface of the main frame and the upper part of the side surface of the cuboid form a first space J, in which a drive control unit of the converter system is placed.

[0093] The second inner crossbeam plane 35 is located below a partial area of the first inner crossbeam plane 34. The rear side of the second inner crossbeam plane 35 is connected to the first inner vertical surface, and its front side is connected to the front side of the main frame of the cuboid.

[0094] A second space I is formed between the first inner crossbeam plane 34 and the second inner crossbeam plane 35. In the second space I, a main outlet water pipeline in the water cooling unit of the converter system is placed.

[0095] The third inner crossbeam plane 47 is located below the second inner crossbeam plane 35. The rear side of the third inner crossbeam plane 47 is connected to the first inner vertical surface, and its rear side is connected to the rear side of the main frame of the cuboid.

[0096] A third space is formed between the third inner crossbeam plane 47 and the second inner crossbeam plane 35, which is used to place the INV inverter unit and at least one single-phase PWM rectifier unit in the topology structure module, as Figure 5 shown in D.

[0097] The INV inverter unit and at least one single-phase PWM rectifier unit adopt water-cooled radiators of the same size, which can make the working junction temperatures of the IGBTs in the four quadrants and the inverter under the main traction and braking conditions similar, ensuring that the service lives of all IGBTs are close.

[0098] All 4QC1 and 4QC2 use 6-element 3-arm modules, so as to increase the demand for the power battery DC-DC converter without changing the structural design of the power unit, and adapt to locomotives using battery packs as auxiliary power.

[0099] The third inner crossbeam plane 47 is fixedly installed on the main frame at the bottom of each unit. Two support crossbeams and two skateboard guides are arranged inside the third inner crossbeam plane 47. The skateboard is connected to the support beam by screws, which can prevent the module from shaking left and right and improve its vibration resistance.

[0100] The fourth inner crossbeam plane 48 is located below another partial area of the first inner crossbeam plane 34. The rear side of the fourth inner crossbeam plane 48 is connected to the rear side of the cuboid main frame, and its front side is connected to the first inner vertical surface.

[0101] The fourth inner crossbeam plane 48 is lower than the third inner crossbeam plane 47.

[0102] A fourth space is formed between the fourth inner crossbeam plane 48 and another partial area below the first inner crossbeam plane 34, which is used to place the support capacitors in the topology structure module, such as Figure 5 shown in E.

[0103] The INV inverter unit and at least one single-phase PWM rectifier unit in the third space are fixedly located on one surface of the DC low-inductance busbar F, and the INV inverter unit and at least one single-phase PWM rectifier unit have the same size and their positions on the DC low-inductance busbar F can be adjusted arbitrarily. The support capacitor E is fixedly located on the other surface of the DC low-inductance busbar F.

[0104] The fifth inner crossbeam plane 49 is located below the third inner crossbeam plane 47. The front side of the fifth inner crossbeam plane 49 is connected to the front side of the main frame, and its rear side is connected to the second inner vertical surface.

[0105] The lower surface of the third inner crossbeam plane 47 is provided with a four-quadrant input current sensor and an inverter output current sensor C of the conversion system. In the space behind the sensor, the main water inlet pipeline H in the water-cooling unit of the conversion device is arranged.

[0106] The third inner crossbeam plane 47 and the fifth inner crossbeam plane 49 form a fifth space, which is used to set the charging contactor and short-circuit contactor of the conversion device in the case of asynchronous electrodes; or in the case of synchronous electrodes, it is used to set the charging contactor, short-circuit contactor and inverter isolation contactor of the conversion device. As shown in B in the figure.

[0107] A seventh space A is formed between the fifth inner crossbeam plane 49 and the bottom surface of the main frame. On the second inner vertical surface, the main circuit interface high-voltage terminals of the conversion system are installed, including four-quadrant input and inverter output terminals, and the quantity and position can be increased or decreased according to actual needs.

[0108] Embodiment 3

[0109] The embodiment of the present invention also provides a conversion device combination supporting flexible configuration of the topology structure. Refer toFigure 7 。

[0110] In this embodiment, the converter devices A101, A102... A10X are arranged in parallel. At both ends of the top of each converter device, a connection component A1 is provided, and adjacent converter devices are connected together through the connection component, ensuring the stability of the vehicle-mounted mobile equipment.

[0111] A sealing strip A3 is provided on the side of each conversion device, and adjacent converter devices are sealed through the sealing strip A3, improving the protection level requirements of the cabinet.

[0112] The multiple combinations of the converter devices achieve the rapid expansion of multiple converter systems, thereby improving production efficiency. Multiple converter devices are combined, and corresponding numbers of drive control units are configured. Each TCU can complete the control of one four-quadrant + one inverter in the main circuit; the management unit receives the diagnostic data of the TCU, summarizes it, and sends out the relevant information of the main converter diagnosis externally; the TCU has dual Ethernet interfaces externally and is connected to the communication network externally to achieve dual Ethernet redundant communication; the TCU uses CAN communication networking internally, and the TCU diagnostic information is sent to the TCU management unit through CAN.

[0113] The main technical functions of the converter device are unified, which is conducive to product platformization, improving production efficiency and R & D efficiency, and improving the quality stability of the product.

[0114] It should be understood that the expression words such as "mechanism", "device", "component", etc. used in this application are only a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the word can be replaced by other expressions.

[0115] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention. In actual applications, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as the combinations of these technical features do not conflict, they should be considered as the scope described in this specification, and various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A variable current device supporting flexible configuration of topological structure, characterized in that Comprising: A converter system and a converter cabinet. The converter system is installed inside the converter cabinet. The converter system includes a topology structure module, a drive control unit, a DC circuit, an input unit, a support capacitor, an output current detection unit, or an output isolation contactor. The converter cabinet has a cuboid structure. The height of the cuboid structure is greater than its length or width. It includes an outer frame, an inner frame, and an outer surface panel. The outer surface panel is disposed outside the outer frame to form an enclosed space, and the inner frame is disposed inside the enclosed space. The inner frame includes a crossbeam plane that divides the enclosed space into several small spaces for placing the respective units in the converter system.

2. The variable flow device supporting flexible configuration of the topological structure according to claim 1, characterized in that, The topology structure module includes: at least one single-phase PWM rectification unit, an INV inversion unit, and a support capacitor. The DC low-inductance busbar has a flat structure. The support capacitor is installed on one surface of the DC low-inductance busbar, and the INV inversion unit and at least one single-phase PWM rectification unit are arranged side by side on the other surface of the low-inductance busbar.

3. The variable current device supporting flexible configuration of topological structure according to claim 1, characterized in that, The outer frame includes: outer vertical beam assemblies, diagonal beam assemblies, top crossbeam assemblies, and bottom crossbeam assemblies. The diagonal beam assemblies and the top crossbeam assemblies are connected to form a top frame. The top frame is connected to the top ends of the outer vertical beam assemblies. The main frame is connected to the bottom crossbeam assemblies to form the main frame of the cuboid structure. The sizes of the diagonal beam assemblies, the top crossbeam assemblies, and the bottom crossbeam assemblies are all smaller than the size of the outer vertical beam assemblies. The bottom crossbeam assemblies form the bottom surface of the main frame.

4. The variable flow device supporting flexible configuration of topological structure according to claim 1, characterized in that Comprising: The outer vertical beam assemblies include four vertical beams respectively disposed on the four sides in the height direction of the cuboid, and the lengths of the two vertical beams on the front side of the main frame are greater than the lengths of the two vertical beams on the rear side. The diagonal beam assemblies include two diagonal beams to form a diagonal top surface. One end of the first diagonal beam is connected to one end of the first vertical beam on the rear side, and its other end is connected to the top end of the third vertical beam on the front side of the main frame through the top crossbeam assembly. One end of the second diagonal beam is connected to one end of the second vertical beam on the rear side, and its other end is connected to the top end of the fourth vertical beam on the front side through the top crossbeam assembly.

5. The variable flow device supporting flexible configuration of topological structure according to claim 4, characterized in that Comprising: The inner frame includes five inner crossbeam planes and a first group of inner vertical beams. The first group of inner vertical beams includes two parallel inner vertical beams, one of which is located inside the left side surface of the main frame and the other is located inside the right side surface of the main frame. The plane formed by the first group of inner vertical beams is parallel to the front side surface and the rear side surface of the main frame to form a first inner vertical surface. The left side edge of each inner crossbeam plane is connected to the left side surface of the main frame, and its right side edge is connected to the right side surface of the main frame. The five inner crossbeam planes are used to divide the main frame into several regions for respectively placing the respective units in the converter system.

6. The variable flow device supporting flexible configuration of topological structure according to claim 5, characterized in that, Comprising: The first inner crossbeam plane is located at the topmost. Its front side edge is connected to the front side surface of the main frame, and its front side edge is connected to the rear side surface of the main frame. A first space is formed between the first inner crossbeam plane and the top frame for arranging the drive control unit of the converter system.

7. The variable flow device supporting flexible configuration of topological structure according to claim 6, characterized in that, Comprising: The part of the second inner crossbeam plane that is below the first inner crossbeam plane, its front side edge is connected to the front side surface of the main frame, and its rear side edge is connected to the first inner vertical surface. A second space is formed between the first crossbeam plane and the second crossbeam plane for placing the main water outlet pipeline in the water-cooling unit of the converter system.

8. The variable current device supporting flexible configuration of topological structure according to claim 7, characterized in that, Comprising: The third inner crossbeam plane is below the second inner crossbeam plane, its front side edge is connected to the front side surface of the main frame, and its rear side edge is connected to the first inner vertical surface. A third space is formed between the second inner crossbeam plane and the third inner crossbeam plane for placing the INV inverter unit and at least one single-phase PWM rectifier unit in the topology module.

9. The variable flow device supporting flexible configuration of topological structure according to claim 8, wherein, Comprising: The fourth inner crossbeam plane is in another part of the area below the first inner crossbeam plane, its rear side edge is connected to the rear side surface of the main frame, and its front side edge is connected to the first inner vertical surface. The fourth inner crossbeam plane is lower than the third inner crossbeam plane. A fourth space is formed between the first inner crossbeam plane and the fourth inner crossbeam plane for placing the support capacitor in the topology module; a sixth space is formed between the fourth inner crossbeam plane and the bottom crossbeam assembly for setting the power resistor of the converter system.

10. The variable current device supporting flexible configuration of topological structure according to claim 8, characterized in that, Comprising: The inner frame further includes a second group of inner vertical beams. The second group of inner vertical beams includes two parallel inner vertical beams. One of the inner vertical beams is within the left side surface of the main frame, and the other inner vertical beam is within the right side surface of the main frame. The second inner vertical surface formed by the second group of inner vertical beams is parallel to the front side surface and the rear side surface of the main frame; The second inner vertical surface is arranged between the first inner vertical surface and the front side surface of the main frame. The fifth inner crossbeam plane is in the part of the area below the third inner crossbeam plane, lower than the fourth inner crossbeam surface, its rear side edge is connected to the second inner vertical surface, and its front side edge is connected to the front side surface of the main frame. A fifth space is formed between the fourth inner crossbeam plane and the fifth inner crossbeam plane for setting the four-quadrant input current sensor and the inverter output current sensor of the converter system, the charging contactor, the short-circuit contactor, or / and the inverter isolation contactor of the converter device. In the space behind the sensor, it is used for placing the main water inlet pipeline in the water-cooling unit of the converter system; A seventh space is formed between the fifth inner crossbeam plane and the bottom crossbeam assembly for setting the high-voltage terminal of the main circuit interface of the converter device.

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