Combined ground traction power supply rectifier structure and ground traction power supply rectifier cabinet

Abstract

The utility model provides a combined type ground traction power supply rectifier structure and a ground traction power supply rectifier cabinet, and relates to the technical field of urban rail transit power supply, a novel combined type structure is provided on the premise of the original size of a single-cabinet rectifier, the sizes of two combined cabinet bodies are the same, and the two combined cabinet bodies are provided with rectifier units. The rectifier unit has a larger space in each side of the cabinet body, the configuration is more flexible, the overall power of the rectifier is improved, and the heat dissipation effect is better when the rectifier bears loads of the same level under the same power level; the direct current side output ends of the first rectification unit and the second rectification unit are connected in parallel through the inter-cabinet copper bar, no extra large cable is needed to connect the direct current side output ends of the two rectification units, the construction difficulty is reduced, the layout is optimized, and the cable resource consumption cost is reduced; and the direct-current side wire outlet copper bar is only led out from one rectifier cabinet, so that the resource consumption is further reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of power supply for urban rail transit, and more specifically, to a combined ground traction power supply rectifier structure and a ground traction power supply rectifier cabinet. Background Technology

[0002] In recent years, urban rail transit has developed rapidly. In the power supply of urban rail transit, the AC power from the medium-voltage AC network is rectified by the ground traction power supply rectifier to obtain DC power, which is then used to supply power to the traction train sets. Due to the different operating environments, voltage systems, passenger volumes, etc. of urban rail transit in various regions, the power, diode configuration, and heat dissipation performance of the ground traction rectifiers used in urban rail transit need to meet higher and more stringent standards to adapt to more diverse requirements.

[0003] Currently, traditional ground traction power supply rectifiers are single-cabinet twelve-pulse rectifiers with output voltage of DC750V / DC1500V, bottom-entry and exit lines, and single-cabinet dimensions (width × depth × height) not exceeding 1200mm × 1200mm × 2300mm. The cooling method is natural cooling, and the load level requirement is Class VI (GB / T3859.1-2013). This limits the number of parallel diodes in each bridge arm of the single-cabinet rectifier (maximum of 3), resulting in low rectifier power. This limits the performance improvement and heat dissipation effect of the rectifier to a certain extent, and it is prone to overload operation during peak passenger flow periods, reducing the service life of the rectifier.

[0004] To address the issues of power, voltage regulation, diode configuration, and heat dissipation inherent in traditional ground traction power supply rectifiers, the current main approach is to split a single-cabinet twelve-pulse rectifier into two single-cabinet six-pulse rectifiers. At the construction site, the DC output terminals of the two six-pulse rectifiers are connected in parallel via a large cable to form a new twelve-pulse rectifier. The output voltage regulation of the newly constructed twelve-pulse rectifier remains unchanged. When connecting external equipment, each of the two six-pulse rectifiers requires a copper busbar to be led out from its internal frame. Alternatively, to increase the output voltage, two twelve-pulse rectifiers with an output voltage of DC 1500V can be used. These two twelve-pulse rectifiers are connected in parallel using an external DC-side cable to form a new twenty-four-pulse rectifier with an output voltage of DC 3000V.

[0005] The above method of combining two single-cabinet rectifiers to form a rectifier increases the overall space of the rectifier, allows for more flexible configuration of the number of diodes, and improves the power of the rectifier. However, when combining two single-cabinet rectifiers, the DC output end needs to be connected in parallel with a large cable. When connecting external equipment, copper busbars need to be led out from both single-cabinet rectifiers, which increases resource consumption and construction difficulty.

[0006] In addition, the two single-cabinet rectifiers are independent of each other, and the acquisition, protection and other devices need to be configured separately. The large number of devices also leads to an increased failure rate of the rectifiers, which increases the pressure on subsequent operation and maintenance. Utility Model Content

[0007] To address the issues of high resource consumption and construction difficulty in existing combined ground traction power supply rectifiers, this utility model proposes a combined ground traction power supply rectifier structure and ground traction power supply rectifier cabinet. While maintaining the same cabinet size, the structural layout of the ground traction power supply rectifier cabinet is optimized, thereby increasing rectifier power while reducing resource consumption and construction difficulty.

[0008] The present invention aims to solve the above-mentioned technical problems to at least a certain extent.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] In the first aspect, this application proposes a combined ground traction power supply rectifier structure, including a first cabinet and a first rectifier unit disposed in the first cabinet, a second cabinet and a second rectifier unit disposed in the second cabinet, and a copper busbar between cabinets.

[0011] The first cabinet and the second cabinet are arranged side by side and have the same size. The copper busbar between the cabinets passes horizontally through the interior of the first cabinet and the interior of the second cabinet, connecting the DC output terminals of the first rectifier unit and the second rectifier unit in parallel. The first cabinet is provided with a DC output copper busbar, one end of which is connected to the DC side of the first rectifier unit and the other end is connected to an external device.

[0012] Based on the above technical means, while keeping the size of a single cabinet unchanged, it is equivalent to splitting the original single-cabinet rectifier into two sides and combining them, each equipped with a rectifier unit. Compared with the single-cabinet structure, the configuration of rectifier units in the two-sided cabinet is more flexible, improving the overall rectifier power. Under the same power level and when bearing the same level of load, the heat dissipation effect is better. Then, the DC output terminals of the first rectifier unit and the second rectifier unit are connected in parallel using the inter-cabinet copper busbar. There is no need to use an additional large cable to connect the DC output terminals of the two rectifier units, reducing construction difficulty, optimizing the layout, and reducing cable resource consumption costs. When connecting external equipment, only the DC output copper busbar is led out from one of the rectifier cabinets, further reducing resource consumption.

[0013] Preferably, the first rectifier unit and the second rectifier unit have the same structure. When both the first rectifier unit and the second rectifier unit are six-pulse rectifier units, the structure is a set of three-phase full-wave rectifier bridge arms. When both the first rectifier unit and the second rectifier unit are twelve-pulse rectifier units, the structure is two sets of three-phase full-wave rectifier bridge arms. Each phase rectifier bridge arm is divided into an upper bridge arm and a lower bridge arm, both of which are composed of several power electronic switches connected in parallel.

[0014] Preferably, when both the first rectifier unit and the second rectifier unit are six-pulse rectifier units, the number of power electronic switches connected in parallel is greater than 3; when both the first rectifier unit and the second rectifier unit are twelve-pulse rectifier units, the number of power electronic switches connected in parallel is not greater than 3.

[0015] Based on the above technical means, while keeping the size of a single cabinet unchanged, the number of power electronic switches connected in parallel in each bridge arm can be configured more flexibly, and it can also match different output voltage systems.

[0016] Preferably, the power electronic switch is a diode.

[0017] Preferably, the combined ground traction power supply rectifier structure further includes an internal frame copper busbar, which is disposed inside the first cabinet and the second cabinet, connecting the frames of the first cabinet and the second cabinet to form a whole; an outgoing frame copper busbar is disposed inside the second cabinet, one end of which is connected to the internal frame copper busbar and the other end is connected to external equipment.

[0018] Based on the above technical means, the frames of the two cabinets are connected by a frame copper busbar to make them a whole. Only one frame copper busbar is led out from one of the cabinets for external equipment connection, reducing one cable to the external equipment and reducing the construction difficulty.

[0019] Preferably, the combined ground traction power supply rectifier structure further includes a primary DC side acquisition and protection component and a primary AC side protection component; wherein, the primary DC side acquisition and protection component is disposed in the first cabinet, connected to the positive and negative DC side outgoing copper busbars, and is shared by the first rectifier unit and the second rectifier unit; the primary AC side protection component is disposed in both the first cabinet and the second cabinet.

[0020] Based on the above technical means, the DC side acquisition and protection component is shared by the first rectifier unit and the second rectifier unit, which reduces the cost of components in the cabinet, reduces the number of components, makes operation and maintenance more convenient, and also reduces the equipment failure rate to a certain extent.

[0021] Preferably, the primary DC-side acquisition and protection component includes: a DC-side overvoltage protection unit, a DC-side residual overvoltage protection unit, a DC-side voltage acquisition unit, and a DC-side current acquisition unit. The DC-side overvoltage protection unit, the DC-side residual overvoltage protection unit, and the DC-side voltage acquisition unit are connected in parallel on the positive and negative DC-side outgoing copper busbars, and the DC-side current acquisition unit is installed on the negative DC-side outgoing copper busbar.

[0022] The primary AC side acquisition and protection component includes: an AC side overvoltage protection unit and an AC side voltage acquisition unit; wherein, the AC side overvoltage protection unit is installed in both the first cabinet and the second cabinet, and the AC side voltage acquisition unit is installed in the first cabinet.

[0023] The combined ground traction power supply rectifier structure also includes an AC side incoming copper busbar, one end of which is connected to an external device, and the other end is connected to the input terminals of the first rectifier unit and the second rectifier unit.

[0024] Preferably, the combined ground traction power supply rectifier structure further includes a secondary control and protection unit and a secondary cable connector. The secondary control and protection unit and the secondary cable connector are both installed in the first cabinet and are respectively connected to the secondary side of the first rectifier unit and the secondary side of the second rectifier unit through the secondary cable connector.

[0025] Based on the above technical means, the secondary control and protection unit is connected to the secondary side of the first rectifier unit and the secondary side of the second rectifier unit respectively through a secondary cable connector. It is shared by the first rectifier unit and the second rectifier unit, which reduces the cost of components in the cabinet. The reduction in the number of components also reduces the equipment failure rate to a certain extent.

[0026] Preferably, the first cabinet is provided with an external terminal block, which is provided with a signal interface and a communication interface. One end of the external terminal block is connected to a secondary control and protection unit, and the other end of the external terminal block is connected to an external device.

[0027] By using the above-mentioned technical means, the number of signal and communication interfaces with external devices can be reduced, thereby reducing construction difficulty and cable costs.

[0028] Secondly, this application also proposes a ground traction power supply rectifier cabinet, which adopts the aforementioned combined ground traction power supply rectifier structure.

[0029] Compared with the prior art, the beneficial effects of the technical solution adopted in this utility model are as follows:

[0030] This utility model proposes a combined ground traction power supply rectifier structure and ground traction power supply rectifier cabinet. Under the premise of the original size of the single cabinet rectifier, a combined structure is proposed, with two cabinets of the same size, each equipped with a rectifier unit. Compared with the single cabinet structure, the rectifier unit enjoys more space in each cabinet, the configuration is more flexible, and the overall rectifier power is improved. Under the same power level and the same load level, the heat dissipation effect is better. Then, the DC output terminals of the first rectifier unit and the second rectifier unit are connected in parallel by the inter-cabinet copper busbar, eliminating the need to use a large cable to connect the DC output terminals of the two rectifier units, reducing construction difficulty, optimizing the layout, and reducing cable resource consumption costs. When connecting external equipment, only the DC output copper busbar is led out from one of the rectifier cabinets, further reducing resource consumption. Attached Figure Description

[0031] Figure 1 A front view showing the structure of the combined ground traction power supply rectifier proposed in this utility model;

[0032] Figure 2 A rear view showing the structure of the combined ground traction power supply rectifier proposed in this utility model;

[0033] Figure 3 This diagram illustrates a specific circuit principle of the combined ground traction power supply rectifier structure proposed in this utility model.

[0034] Among them, 1-first cabinet; 2-first rectifier unit; 3-second cabinet; 4-second rectifier unit; 5-inter-cabinet copper busbar; 6-DC side outgoing copper busbar; 7-cabinet internal frame copper busbar; 8-outgoing frame copper busbar; 9-primary DC side acquisition and protection component; 91-DC side overvoltage protection unit; 92-DC side residual overvoltage protection unit; 93-DC side voltage acquisition unit; 94-DC side current acquisition unit; 101-primary AC side acquisition and protection component; 102-AC side incoming copper busbar; 10-secondary control and protection unit; 11-secondary cable connector; 12-external terminal block. Detailed Implementation

[0035] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0036] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions;

[0037] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings;

[0038] The terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] This embodiment proposes a combined ground traction power supply rectifier structure. Figure 1 This is a front view of the combined ground traction power supply rectifier structure proposed in this embodiment. Figure 2 This is a rear view of the combined ground traction power supply rectifier structure proposed in this embodiment. See also... Figure 1 The structure includes a first cabinet 1 and a first rectifier unit 2 disposed within the first cabinet 1, a second cabinet 3 and a second rectifier unit 4 disposed within the second cabinet 3, and an inter-cabinet copper busbar 5. Combined with... Figure 1 and Figure 2 As can be seen, the first cabinet 1 and the second cabinet 2 are arranged side by side and have the same size. The copper busbar 5 between the cabinets passes horizontally through the interior of the first cabinet 1 and the interior of the second cabinet 3, connecting the DC output terminals of the first rectifier unit 2 and the second rectifier unit 4 in parallel. (See [reference]). Figure 1 The first cabinet 1 is equipped with a DC-side copper busbar 6. One end of the DC-side copper busbar 6 is connected to the DC side of the first rectifier unit 2, and in a specific implementation, the other end of the DC-side copper busbar 6 is connected to an external device. Similarly, the DC-side copper busbar 6 can also be installed in the second cabinet 2.

[0042] The combined ground traction power supply rectifier structure proposed in this embodiment maintains the same size as a single-cabinet rectifier, essentially splitting the original single-cabinet rectifier into two sides and combining them. Rectifier units are configured in both cabinets. Compared to a single-cabinet structure, the rectifier units in each cabinet have more space, allowing for more flexible configuration and increasing overall rectifier power. Under the same power level and load, heat dissipation is better. The DC output terminals of the first rectifier unit 2 and the second rectifier unit 4 are connected in parallel using the inter-cabinet copper busbar 5, eliminating the need for additional large cables to connect the DC output terminals of the two rectifier units. This reduces construction difficulty, optimizes the layout, and lowers cable resource consumption costs. When connecting external equipment, only one rectifier cabinet needs to have its DC output copper busbar led out, further reducing resource consumption. Furthermore, the first cabinet 1 and the second cabinet 2 are the same size. In actual implementation, the two cabinets can act as master and slave cabinets respectively, allowing for flexible configuration to meet different usage scenarios and cabinet layouts. Moreover, the overall design is aesthetically pleasing and elegant.

[0043] Example 2

[0044] The following describes the circuit principle of the structure proposed in this application using a specific circuit diagram of the rectifier unit. In this embodiment, the first rectifier unit and the second rectifier unit have the same structure. When both the first and second rectifier units are six-pulse rectifier units, the structure consists of a set of three-phase full-wave rectifier bridge arms. When both the first and second rectifier units are twelve-pulse rectifier units, the structure consists of two sets of three-phase full-wave rectifier bridge arms. Each phase rectifier bridge arm is divided into an upper bridge arm and a lower bridge arm, both composed of several power electronic switches connected in parallel. When both the first and second rectifier units are six-pulse rectifier units, the number of power electronic switches connected in parallel is greater than 3. When both the first and second rectifier units are twelve-pulse rectifier units, the number of power electronic switches connected in parallel is no greater than 3. This embodiment uses a single-sided six-pulse rectifier unit as an example. Two six-pulse rectifier units can be combined to form a twelve-pulse rectifier unit. The schemes for single-sided twelve-pulse rectifier units are all similar. Two twelve-pulse rectifier units can be combined to form a twenty-four-pulse rectifier unit. In this embodiment, see... Figure 3 ,by Figure 3 Based on the circuit diagram shown, the upper part indicates that the first rectifier unit 2 uses a single-sided six-pulse rectifier unit structure, and the lower part indicates that the second rectifier unit 4 also uses a single-sided six-pulse rectifier unit structure. It can be seen that both the first rectifier unit 2 and the second rectifier unit 4 include a set of three-phase full-wave rectifier bridge arms. Each bridge arm consists of 4 diodes connected in parallel. Compared with the traditional case of a maximum of 3 diodes connected in parallel, the number of power electronic switches connected in parallel in each bridge arm is increased. This is because the rectifier units in the two cabinets can enjoy more space in each cabinet, and the number configuration is more flexible. It can also match different output voltage systems. Of course, this embodiment only takes 4 diodes connected in parallel as an example. The schemes for different bridge arms with different numbers of diodes are similar, and the number of diodes can be flexibly configured.

[0045] exist Figure 3 In the diagram, the AC side input is through rectifier transformer T. The output terminals of rectifier transformer T output three-phase lines that enter a single-sided six-pulse rectifier unit. L1, L2, and L3 are connected to the first rectifier unit 2, and L4, L5, and L6 are connected to the second rectifier unit 4. Voltage sensor BV1 is the AC side voltage acquisition element. Resistors R1-R6 and capacitors C1-C6 are AC side overvoltage protection devices. Resistors R7-R10 are load resistors used to control the DC side no-load grid voltage. (See [link to relevant documentation]). Figure 3 Corresponding to the first cabinet 1 and the second cabinet 3, each single-sided six-pulse rectifier unit has six bridge arms, and each bridge arm contains four parallel diodes VD. A fast-acting fuse FU is also connected in series on the branch containing each diode VD. Figure 3 Only one bridge arm is marked as an example; the other bridge arms are marked the same way. From Figure 3As shown in the circuit diagram, the DC-side output of the six-pulse rectifier unit in the first cabinet 1 and the DC-side output of the six-pulse rectifier unit in the second cabinet 3 are directly connected in parallel and then connected to the common circuit. Figure 3 The primary DC side acquisition protection component 9 is shared by both parties.

[0046] like Figure 1 As shown, the combined ground traction power supply rectifier structure proposed in this embodiment also includes an internal frame copper busbar 7. The internal frame copper busbar 7 is disposed inside the first cabinet 1 and the second cabinet 3, connecting the frames of the first cabinet 1 and the second cabinet 3 to form a whole. An outgoing frame copper busbar 8 is disposed inside the second cabinet 3. One end of the outgoing frame copper busbar 8 is connected to the internal frame copper busbar 7, and the other end is connected to external equipment.

[0047] In this embodiment, the frames of the two cabinets are connected by the copper busbar 7 inside the cabinet, making them a whole. Then, the copper busbar 8 of the cable frame is led out from only one of the cabinets for external equipment connection, which reduces one cable for connecting to external equipment, thus reducing construction difficulty and cable consumption.

[0048] In this embodiment, the combined ground traction power supply rectifier structure also includes a primary DC side acquisition and protection component 9 and a primary AC protection component 101. See also... Figure 2 The primary DC-side acquisition and protection component 9 is located inside the first cabinet 1 and is connected to the positive and negative DC-side outgoing copper busbars 6, which are shared by the first rectifier unit 2 and the second rectifier unit 4. By sharing the primary DC-side acquisition and protection component 9 with the first rectifier unit 2 and the second rectifier unit 4, the number of components in the cabinet is reduced, making operation and maintenance more convenient, reducing the equipment failure rate to a certain extent, and also reducing component costs.

[0049] Combination Figure 3The specific circuit diagram shown includes a DC-side acquisition and protection component 9 comprising: a DC-side overvoltage protection unit 91, a DC-side residual overvoltage protection unit 92, a DC-side voltage acquisition unit 93, and a DC-side current acquisition unit 94. In this embodiment, the DC-side overvoltage protection unit 91 includes resistors R19 and R20 and a capacitor C7. Resistors R19 and R20 are connected in parallel and then in series with capacitor C7. The DC-side residual overvoltage protection unit 92 includes varistors RV1, RV2, and RV3, which are connected in series to absorb residual overvoltage on the DC side. The DC-side voltage acquisition unit 93 is a voltage sensor BV2, and the DC-side current acquisition unit 94 is... The current sensor BC, the DC-side overvoltage protection unit 91 and the DC-side residual overvoltage protection unit 92 are connected in parallel. One end of the DC-side voltage acquisition unit 93 is connected to the input terminal of the parallel connection of the DC-side overvoltage protection unit 91 and the DC-side residual overvoltage protection unit 92. The output terminal of the parallel connection of the DC-side overvoltage protection unit 91 and the DC-side residual overvoltage protection unit 92 is connected to one end of the DC-side current acquisition unit 94. The other end of the DC-side current acquisition unit 94 is connected to the other end of the DC-side voltage acquisition unit 93. Correspondingly, within the cabinet, the DC-side voltage acquisition unit 93, the DC-side overvoltage protection unit 91 and the DC-side residual overvoltage protection unit 92 are connected in parallel to the positive and negative DC-side outgoing copper busbars 6. In this embodiment, the design of the primary DC-side acquisition protection component 9, from the perspective of the main circuit, allows the two six-pulse rectifier units to share a set of DC-side protection devices, voltage and current acquisition elements of the main circuit. In specific implementation, a voltmeter and an ammeter can be designed as local displays, or other related display devices can be designed.

[0050] See Figure 2 The primary AC side protection component 101 is installed in both the first cabinet 1 and the second cabinet 3. The combined ground traction power supply rectifier structure also includes an AC side incoming copper busbar 102. The primary AC acquisition and protection component 101 includes an AC side overvoltage protection unit and an AC side voltage acquisition unit. The AC side overvoltage protection unit is installed in both the first cabinet 1 and the second cabinet 3, and is connected in parallel to the AC side incoming copper busbar 102. One end of the AC side incoming copper busbar is connected to external equipment, and the other end is connected to the input terminals of the first and second rectifier units. The AC side voltage acquisition unit is installed in the first cabinet and connected in parallel to the AC side incoming copper busbar 102. The fact that the AC side voltage acquisition unit is only installed in the first cabinet 1 reduces resource consumption compared to the original combination of two independent single cabinets.

[0051] See Figure 1The combined ground traction power supply rectifier structure also includes a secondary control and protection unit 10 and a secondary cable connector 11. The secondary control and protection unit 10 and the secondary cable connector 11 are both located in the first cabinet 1 and are connected to the secondary side of the first rectifier unit 2 and the secondary side of the second rectifier unit 4 respectively through the secondary cable connector 11.

[0052] The secondary control and protection unit 10 is connected to the secondary side of the first rectifier unit 2 and the secondary side of the second rectifier unit 4 respectively through the secondary cable connector 11. It is shared by the first rectifier unit 2 and the second rectifier unit 4. In specific implementation, the secondary control and protection unit 10 includes a PLC and a display screen. That is, in the design of the secondary circuit, the two cabinet rectifier units share a set of PLC and a display screen for signal acquisition, processing and display. They also share a set of control and protection circuits such as heating circuit, lighting circuit, interlocking circuit and communication circuit. The connector is used to realize the acquisition and control of different signals between cabinets, which reduces the cost of components in the cabinet. The reduction in the number of components also reduces the equipment failure rate to a certain extent.

[0053] The first cabinet 1 is equipped with an external terminal block 12, which has signal and communication interfaces. One end of the external terminal block 12 is connected to a secondary control and protection unit, and the other end is connected to external equipment. In this embodiment, the external terminal block 12 on the first cabinet 1 provides a unified signal and communication interface, reducing the number of signal and communication interfaces with external equipment, thus reducing construction difficulty and cable costs. Similarly, an external terminal block can also be provided on the second cabinet 3.

[0054] Example 3

[0055] This embodiment proposes a combined ground traction rectifier cabinet, which adopts a combined ground traction power supply rectifier structure. Under the premise of the original size of a single-cabinet rectifier, the combined rectifier structure allows for more flexible diode configuration, increases rectifier power, and can flexibly match different output voltage systems and power requirements. Under the same power level and load capacity, it provides better heat dissipation. The inter-cabinet copper busbar connects the DC output terminals of the first and second rectifier units in parallel, eliminating the need for additional large cables, reducing construction difficulty, optimizing layout, and lowering cable resource consumption costs. When connecting external equipment, only one side of the rectifier cabinet needs to lead out the DC output copper busbar, further reducing resource consumption, making operation more convenient, and thus reducing the difficulty of operation and maintenance.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A combined ground traction power supply rectifier structure, characterized in that, It includes a first cabinet and a first rectifier unit installed in the first cabinet, a second cabinet and a second rectifier unit installed in the second cabinet, and a copper busbar between cabinets; The first cabinet and the second cabinet are arranged side by side and have the same size. The copper busbar between the cabinets passes horizontally through the interior of the first cabinet and the interior of the second cabinet, connecting the DC output terminals of the first rectifier unit and the second rectifier unit in parallel. The first cabinet is provided with a DC output copper busbar, one end of which is connected to the DC side of the first rectifier unit and the other end is connected to an external device.

2. The combined ground traction power supply rectifier structure according to claim 1, characterized in that, The first rectifier unit and the second rectifier unit have the same structure. When both the first rectifier unit and the second rectifier unit are six-pulse rectifier units, the structure is a set of three-phase full-wave rectifier bridge arms. When both the first rectifier unit and the second rectifier unit are twelve-pulse rectifier units, the structure is two sets of three-phase full-wave rectifier bridge arms. Each phase rectifier bridge arm is divided into an upper bridge arm and a lower bridge arm, which are composed of several power electronic switches connected in parallel.

3. The combined ground traction power supply rectifier structure according to claim 2, characterized in that, When both the first rectifier unit and the second rectifier unit are six-pulse rectifier units, the number of power electronic switches connected in parallel is greater than 3. When both the first rectifier unit and the second rectifier unit are twelve-pulse rectifier units, the number of power electronic switches connected in parallel is not greater than 3.

4. The combined ground traction power supply rectifier structure according to claim 3, characterized in that, The power electronic switch is a diode.

5. The combined ground traction power supply rectifier structure according to claim 1, characterized in that, It also includes an internal frame copper busbar, which is installed inside the first cabinet and the second cabinet, connecting the frames of the first cabinet and the second cabinet to form a whole; a cable outlet frame copper busbar is installed inside the second cabinet, with one end of the cable outlet frame copper busbar connected to the internal frame copper busbar and the other end connected to external equipment.

6. The combined ground traction power supply rectifier structure according to claim 1, characterized in that, It also includes a primary DC side acquisition and protection component and a primary AC side protection component; wherein, the primary DC side acquisition and protection component is installed in the first cabinet, connected to the positive and negative DC side outgoing copper busbars, and is shared by the first rectifier unit and the second rectifier unit; the primary AC side protection component is installed in both the first cabinet and the second cabinet.

7. The combined ground traction power supply rectifier structure according to claim 6, characterized in that, The primary DC-side acquisition and protection component includes: a DC-side overvoltage protection unit, a DC-side residual overvoltage protection unit, a DC-side voltage acquisition unit, and a DC-side current acquisition unit. The DC-side overvoltage protection unit, the DC-side residual overvoltage protection unit, and the DC-side voltage acquisition unit are connected in parallel on the positive and negative DC-side outgoing copper busbars, and the DC-side current acquisition unit is installed on the negative DC-side outgoing copper busbar. The primary AC side acquisition and protection component includes: an AC side overvoltage protection unit and an AC side voltage acquisition unit; wherein, the AC side overvoltage protection unit is installed in both the first cabinet and the second cabinet, and the AC side voltage acquisition unit is installed in the first cabinet. The combined ground traction power supply rectifier structure also includes an AC side incoming copper busbar, one end of which is connected to an external device, and the other end is connected to the input terminals of the first rectifier unit and the second rectifier unit.

8. The combined ground traction power supply rectifier structure according to claim 1, characterized in that, It also includes a secondary control and protection unit and a secondary cable connector, both of which are located inside the first cabinet and are connected to the secondary side of the first rectifier unit and the secondary side of the second rectifier unit respectively through the secondary cable connector.

9. The combined ground traction power supply rectifier structure according to claim 8, characterized in that, The first cabinet is equipped with an external terminal block, which has a signal interface and a communication interface. One end of the external terminal block is connected to a secondary control and protection unit, and the other end is connected to an external device.

10. A ground traction power supply rectifier cabinet, characterized in that, The combined ground traction power supply rectifier structure described in any one of claims 1 to 9 is adopted.

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