High-power direct-current load cooling and cooling control method

Abstract

A high-power direct-current load cooling method based on variable modular combination comprises the steps that a high-power load is divided into a plurality of resistor modules, resistor load bodies of the resistor modules are sealed and then placed in an independent cooling water tank, and then the independent cooling water tank is placed on a supporting frame in an overall resistor cabinet; the water inlets and the water outlets of the independent cooling water tanks are arranged in series according to a thermal sequence through cooling water pipes to form independent cooling water tank groups, cooling water sequentially flows through all the independent cooling water tanks, heat of the resistor modules in the independent cooling water tanks is taken away in a layered mode, and cooling and heat dissipation are conducted on resistor loads of the resistor modules. High-power direct-current loads are modularized and then are respectively arranged in the independent water-cooling box bodies, and all the independent water-cooling box bodies are connected in series through the cooling water pipes, so that cooling water flows through each independent water-cooling box body according to a rule, and cooling of each resistor module can be effectively controlled; the high-power direct-current load can be well cooled in various selection modes.

Description

Technical Field

[0001] This invention relates to a cooling and control method for a DC load, and more particularly to a cooling method for a high-power DC load based on a variable modular combination, belonging to the field of DC load cooling technology. Background Technology

[0002] High-power DC loads refer to DC load devices with a power rating of 1000W or higher, primarily used for testing and simulating high-performance power supplies. High-power DC loads are mainly used for testing in high-power applications, such as testing high-power motors in industrial production and verifying the performance of battery chargers. They can simulate high-power load conditions, ensuring the stability and safety of equipment under high loads.

[0003] The application principle of high-power DC loads is based on the resistor principle. By adding an adjustable resistive load to the circuit, actual load conditions are simulated to perform load tests on the power supply or battery under test.

[0004] The power of existing high-power DC loads is getting larger and larger, and there are more and more loads of various levels; however, high-power DC loads will generate a lot of heat during operation, causing the resistive element to heat up; therefore, heat dissipation is required for high-power DC loads during operation.

[0005] Currently, high-power DC loads are cooled using centralized cooling, where all DC power loads are cooled by a single heatsink. However, in practical applications, this method has been found to have uneven heat dissipation, leading to localized overheating. This is especially true with the introduction of distributed DC loads; if the traditional centralized cooling method is still used, localized burn-out is likely to occur. Therefore, it is necessary to improve this approach.

[0006] The search revealed no identical technical reports, only technical literature in related fields. The most similar articles are as follows: 1. Patent document CN109100661A discloses a high-power DC electronic load, comprising: multiple independent power units electrically connected in parallel, each independent power unit consisting of a main control module and a power module connected together; the main control modules of each independent power unit are connected via a data bus; and the control terminals of the power modules of each independent power unit are electrically connected to a shared control bus. While this electronic load allows multiple independent power units to be connected in parallel to form a high-power electronic load, or to be used independently according to power requirements, thus enabling free combination to form various forms of electronic loads, there is still no good solution for heat dissipation and cooling of the load; therefore, the aforementioned problems persist.

[0007] 2. Patent document CN221946080U discloses a molten salt-cooled high-power energy storage test load, including several energy-consuming resistor devices for load testing of the device under test. Each energy-consuming resistor device includes a resistor tank and several resistor components fixedly installed within the resistor tank. The resistor components are connected to the output terminal of the device under test. One end of the resistor tank is connected to a cold salt tank for storing solid molten salt, and the other end is connected to a hot salt tank for storing liquid molten salt. A power generation and energy storage device for converting heat energy into electrical energy is installed on the hot salt tank. Although this resistive load uses liquid molten salt for heat dissipation, which has excellent heat dissipation properties, it still employs a centralized heat dissipation solution, thus the aforementioned problems persist.

[0008] 3. Patent document CN107800306A discloses a high-power AC / DC drive rectifier cabinet based on heat pipe cooling technology, including a cabinet body, heat pipe power modules, support plates, AC and DC busbars, support frames, cooling fans, insulating partitions, shunts, AC busbar fixing frames, current transformers, fast fuses, resistors, capacitors, capacitor insulation boards, and resistor insulation boards. Support beams are installed on both sides of the cabinet body for support and fixation. The cabinet body is divided into front and rear sections: the front section is the rectifier module working area, the upper rear section is the fan exhaust cooling area, and the lower rear section is the AC and DC busbar area. This patent adopts a distributed module design, with each module using heat pipes for heat dissipation. However, this heat dissipation method presents problems for truly high-power applications, especially since the heat dissipation of the heat pipes often suffers from unevenness, thus the aforementioned problems remain unresolved.

[0009] Analysis of existing patented technologies reveals that heat dissipation and cooling remain pressing issues for ultra-high power DC loads; therefore, further research and improvement are needed. Summary of the Invention

[0010] The technical problem to be solved by this invention is: how to propose a cooling method for high-power DC loads with better heat dissipation effect to address the difficulty of heat dissipation for high-power DC loads.

[0011] To address the above problems, the technical solution proposed by this invention is as follows: A high-power DC load cooling method based on variable modular combination involves dividing the high-power load into multiple resistor modules. Each resistor module's load body is sealed and placed in an independent cooling water tank. All independent cooling water tanks are then placed on a support frame within the overall load cabinet. The inlets and outlets of all independent cooling water tanks are connected in series according to thermal order via cooling water pipes to form an independent cooling water tank assembly. Cooling water flows sequentially through the inlets and outlets of all independent cooling water tanks, carrying away the heat from the resistor modules in each independent cooling water tank in a layered manner, thus cooling and dissipating heat from the resistor load body of the resistor modules.

[0012] Furthermore, dividing the high-power load into multiple resistor modules involves dividing the high-power DC load into multiple branch loads according to the determined load distribution principle, and each branch load is composed of multiple resistor modules connected in series. Multiple speed ranges are formed by arbitrarily combining the resistor modules; through reasonable matching of multiple speed ranges, any speed range between 10kW and 1000kW can be formed, with the minimum speed range being 10kW and the minimum adjustment step being 10kW.

[0013] Furthermore, the process of sealing the resistive load of each resistor module and placing it in an independent cooling water tank involves placing the resistive load of each module within the cooling pipes of its respective independent cooling water tank. A water-cooled cavity exists outside the cooling pipes and inside the independent cooling water tank, containing flowing cooling water. The cooling water carrying away the heat from the resistive load housed in the metal pipes carries away the heat. Furthermore, guide plates are evenly distributed within the water-cooled cavity, with turbulence holes on the guide plates. The guide plates further divide the water-cooled cavity of each independent cooling water tank into multiple sub-cavities, and the turbulence holes guide the cooling water through the water-cooled cavity in a turbulent flow manner, from the inlet to the outlet.

[0014] Furthermore, the resistive load body is a long strip-shaped tubular resistor tube, which is installed in the cooling pipe of an independent cooling water tank by locking nuts and sealing rings. The lead-out ends of the tubular resistor tube are connected in series and parallel to the contactor assembly and the negative busbar by connecting copper busbars and cables to each range.

[0015] Furthermore, placing all the independent cooling water tanks on the support frame inside the overall load box cabinet involves installing all the independent cooling water tanks layer by layer from top to bottom on the support frame inside the overall load box cabinet, with the independent cooling water tank of the resistor module with the highest heat generation placed at the bottom layer, and the independent cooling water tank of the resistor module with the lowest heat generation placed at the top layer, with the middle layers arranged in descending order of heat generation from bottom to top; then, the cooling water channels of all the independent cooling water tanks are connected in series from bottom to top using cooling water pipes, so that the resistive load of all resistor modules is cooled from bottom to top.

[0016] Furthermore, the independent cooling water tank is a long strip-shaped box, and each independent cooling water tank has an inlet and an outlet on one side; the inlet and outlet are respectively located at both ends of the same side, and the inlet and outlet of each independent cooling water tank are connected to each other through cooling water pipes.

[0017] Furthermore, the inlet and outlet of each independent cooling water tank are interconnected through cooling water pipes, and the inlet and outlet of the independent cooling water tanks are connected vertically through cooling water pipes. The inlet of the upper module box is connected to the outlet of the lower module box, forming a multi-layer module box with cooling water connected from bottom to top.

[0018] Furthermore, the water-cooling cavity inside the independent cooling water tank is equipped with a baffle plate to ensure that the cooling water flows sequentially from the inlet to the outlet when it enters the water-cooling cavity, ensuring that all resistive loads inside the independent cooling water tank can receive uniform heat dissipation.

[0019] Furthermore, the cooling water pipe is connected to the inlet and outlet of the independent cooling water tank via a cooling water pipe connecting flange. The flow rate of the cooling water pipe is greater than 35 m³ / h, ensuring that all resistive loads in the independent cooling water tank can receive uniform heat dissipation.

[0020] Furthermore, the bottommost cooling water pipe and the topmost outlet pipe are respectively connected to a cooling water circulation system; the cooling water circulation system is set in a cooling water tank next to the cabinet-type enclosure, and the cooling water circulation system provides a cooling water volume of more than 40m³ / h to the entire DC load, thereby cooling the entire DC load with a large volume of cooling water.

[0021] Furthermore, the control methods for the resistor module are divided into two types: local manual control and user remote control (providing communication interfaces and communication solutions).

[0022] Beneficial effects: This invention adopts a modular combination to form a DC load, and each resistor module is cooled through an independent module box. This not only allows for arbitrary module combination to realize multi-level load applications, but also effectively combines electronic module cooling and heat dissipation, avoiding uneven heat dissipation of electronic modules. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional view of the overall rear side of the present invention; Figure 3 This is a front view of the overall structure of the present invention; Figure 4 This is a side view of the overall structure of the present invention; Figure 5 This is a schematic diagram of the resistor module structure of the present invention; Figure 6 for Figure 5 A top-view structural diagram; Figure 7 for Figure 5 A schematic diagram of the side structure; Figure 8 This is a cross-sectional schematic diagram of an independent cooling water tank.

[0024] In the diagram: 1. Resistor module; 2. Resistor load body; 3. Independent cooling water tank; 4. Overall load box cabinet; 5. Independent cooling water tank support frame; 6. Water inlet; 7. Water outlet; 8. Cooling water pipe; 9. Cooling pipe; 10. Connecting copper busbar; 11. Control panel; 12. Water-cooled cavity; 13. Baffle plate; 14. Circulating water cooling system; 15. Circulating water pump; 16. Cooling water pipe connecting flange; 17. Cable; 18. Connecting water pipe; 19. Contactor assembly and negative busbar; 20. Turbulence orifice. Detailed Implementation

[0025] The present invention will now be further described with reference to the accompanying drawings: like Figure 1-4 As shown, a method for cooling a high-power DC load based on variable modular combination is described. The DC load is water-cooled to prevent a large amount of heat from dissipating into the air. The high-power load is divided into multiple resistor modules 1, and the resistor load body 2 of each resistor module 1 is sealed and placed in an independent cooling water tank 3. Then, all the independent cooling water tanks 3 are placed on independent cooling water tank support frames 5 inside the overall load tank cabinet 4. The inlets 6 and outlets 7 of all the independent cooling water tanks 3 are connected by cooling water pipes 8 and arranged in series according to thermal order to form an independent cooling water tank group. Cooling water flows through the inlets 6 and outlets 7 of the independent cooling water tanks 3 in sequence through all the independent cooling water tanks 3, carrying away the heat of the resistor modules 1 in the independent cooling water tanks 3 in layers, thereby cooling and dissipating heat from the resistor load body 2 of the resistor modules 1.

[0026] Furthermore, dividing the high-power load into multiple resistor modules 1 involves dividing the high-power DC load into multiple branch loads according to the determined load distribution principle, and each branch load is composed of multiple resistor modules 1 connected in series. Multiple speed ranges are formed by arbitrarily combining the resistor modules 1. Through reasonable matching of multiple speed ranges, any speed range between 10kW and 1000kW can be formed, with a minimum speed range of 10kW and a minimum adjustment step of 10kW.

[0027] Preferably, the total load capacity is 3MW, DC900V voltage, and it is divided into 3 independent 1MW loads. The 3 loads can work independently or in combination.

[0028] Each independent load power is 1MW, divided into eight levels: 10kW, 20kW, 20kW, 50kW, 100kW, 200kW, 200kW, and 400kW. Through reasonable matching of these levels, any level between 10kW and 1000kW can be formed, with the minimum level being 10kW and the minimum adjustment step being 10kW; effectively meeting the needs of various DC loads.

[0029] As attached Figure 5-8 As shown, further, the process of sealing the resistor load 2 of each resistor module 1 and placing it in an independent cooling water tank 3 involves placing the resistor load 2 inside the cooling pipe 9 of the independent cooling water tank 3. Outside the cooling pipe 9 and inside the independent cooling water tank 3, there is a water-cooled cavity 12 containing flowing cooling water. The cooling water flowing through the cavity carries away the heat from the resistor load 2 housed in the metal pipe. Furthermore, guide plates 13 are evenly arranged inside the water-cooled cavity 12, and the guide plates 13 have turbulence holes 20 that facilitate turbulence. The guide plates 13 further divide each independent cooling water tank 3's water-cooled cavity 12 into multiple compartments, and the cooling water flows turbulently through the turbulence holes 20 within the water-cooled cavity 12, from the inlet 6 to the outlet 7. Preferably, the guide plates 13 are perforated plates with evenly distributed holes, which further enhances the turbulence effect of the flowing cooling water.

[0030] Furthermore, the resistor load body 2 is a long strip-shaped tubular resistor tube. The tubular resistor tube is installed in the cooling pipe 9 of the independent cooling water tank 3 by locking nuts and sealing rings. The outlet ends of the tubular resistor tube are connected in series and parallel to each gear by connecting copper busbars 10 and cables 17, and connected to the contactor assembly and negative busbar on the control panel 11. Moreover, all the inlet and outlet connectors of the tubular resistor tube are installed on the same side of the independent cooling water tank. The inlet and outlet connectors of the resistor load body 2 are connected to the contactor assembly and negative busbar 19 on the control panel 11 by connecting copper busbars.

[0031] Furthermore, the control methods for the resistor modules are divided into two types: local manual control and user remote control (providing communication interfaces and communication solutions). Among them, manual control involves manually configuring the incoming and outgoing wires according to the overall load requirements outside the wiring terminals of each resistor load body 2 of the electrical module to form an overall DC load; or connecting all resistor load bodies 2 of the overall load to the control panel 11, and the operator remotely controls the contactor to configure and adjust as needed, and controls it according to the conventional control method.

[0032] Furthermore, placing all the independent cooling water tanks 3 on the support frame 5 inside the overall load box cabinet 4 involves installing all the independent cooling water tanks 3 layer by layer from top to bottom on the support frame 5 inside the overall load box cabinet 4, with the independent cooling water tank 3 of the resistor module 1 with the highest heat generation placed at the bottom layer, and the independent cooling water tank 3 of the resistor module 1 with the lowest heat generation placed at the top layer, and the middle layers arranged in descending order of heat generation from bottom to top; then, the cooling water channels of all the independent cooling water tanks 3 are connected in series from bottom to top using cooling water pipes 8, so that the resistor load body 2 of all resistor modules 1 is cooled by cooling water from bottom to top.

[0033] Furthermore, the independent cooling water tank 3 is a long, narrow box, with an inlet 6 and an outlet 7 simultaneously provided on one side of each independent cooling water tank 3; the inlet 6 and outlet 7 are respectively located at both ends of the same side, and the inlet 6 and outlet 7 of each independent cooling water tank 3 are connected in series via cooling water pipes 8. The inlet 6 is located in the middle of the independent cooling water tank 3 in the horizontal direction, and the outlet 7 is located in the upper part of the independent cooling water tank 3 in the horizontal direction, forming a structure where water enters from the middle and exits from the upper part of the independent cooling water tank 3, which is more conducive to thermodynamic heat dissipation.

[0034] Furthermore, the inlet 6 and outlet 7 of each independent cooling water tank 3 are interconnected through cooling water pipes 8, and the inlet 6 and outlet 7 of the independent cooling water tank 3 are connected vertically through cooling water pipes 8. The inlet of the upper layer of independent cooling water tank 3 is connected to the outlet 7 of the lower layer, forming a series connection of cooling water in multiple independent cooling water tanks 3 from bottom to top.

[0035] The multi-layer independent cooling water tanks 3 are connected in series from bottom to top to divide the overall load into multiple resistor modules 1. The independent cooling water tanks 3 of each resistor module 1 are arranged in layers from bottom to top on the independent cooling water tank support frame 5 of the overall load cabinet 4 according to the amount of heat generated. All the independent cooling water tanks 3 are connected in series by cooling water pipes 8 according to the amount of heat generated. Then, the total inlet and outlet of the series independent cooling water tanks 3 are connected to the outlet and return of the circulating water pump 15 of the circulating water cooling system 14 through connecting water pipes 18, forming a multi-layer integrated series cooling loop with upper and lower layers.

[0036] Furthermore, a guide plate 13 is provided in the water-cooling cavity 12 inside the independent cooling water tank 3 to ensure that the cooling water flows sequentially from the inlet to the outlet when it enters the water-cooling cavity, ensuring that the resistive load 2 inside the independent cooling water tank 3 can be uniformly cooled.

[0037] Furthermore, the cooling water pipe 8 is connected to the inlet 6 and outlet 7 of the independent cooling water tank 3 through the cooling water pipe connecting flange 16. The flow rate of the cooling water pipe 8 is greater than 35 m³ / h, ensuring that all resistive loads in the independent cooling water tank can receive uniform heat dissipation.

[0038] Furthermore, cooling water first enters the module housing of the lowest-level resistor module 1 through the module housing inlet 6, then flows out from the lowest-level module housing outlet 7, and enters the inlet of the next-level module housing, until it reaches the inlet of the highest-level module housing. The outlet pipe of the module housing of the highest-level resistor module 1 is connected to the water tank of the circulating water cooling system, and the outlet 7 of the circulating water cooling system is connected to the inlet 6 of the lowest-level module housing, forming the circulating water cooling system 14. The circulating water cooling system 14 is forcibly cooled by the circulating water pump 15. The cooling water circulation system is set in the cooling circulating water tank next to the cabinet housing. The cooling water circulation system provides more than 40 m³ / h of cooling water to the entire DC load. By circulating the large volume of cooling water to cool the entire DC load, most of the heat of each module can be effectively removed.

[0039] The beneficial technical effects of the present invention are as follows: This invention employs a modular assembly to construct a DC load, with each resistor module cooled by an independent module housing. This not only allows for arbitrary module combinations and multi-level load applications, but also effectively integrates electronic module cooling and heat dissipation, preventing uneven heat dissipation. The main advantages are as follows: 1. The present invention adopts modular combination to form DC load and independently cools each module, so that the heat dissipation of the entire load is distributed. Through reasonable module combination, it can effectively ensure uniform heat dissipation of all modules. 2. The module of this invention is divided into 3 independent loads, which can work independently or in combination; each independent load has a power of 1MW, with eight levels: 10kW, 20kW, 20kW, 50kW, 100kW, 200kW, 200kW, and 400kW. By reasonably matching these levels, they can be combined to form any level between 10kW and 1000kW, with a minimum level of 10kW and a minimum adjustment step of 10kW; this can basically meet the needs of various DC loads. 3. The combined control mode of the resistor module of the present invention is divided into two control modes: local manual control and user remote control (providing communication interface and communication scheme). It can adapt to the needs of various places. In particular, the use of the same side to set the input and output connection greatly facilitates the connection of manual control. This has the characteristics of simplicity and practicality for customers who do not often need to change DC load. 4. This invention modularizes the high-power DC load and then installs them into independent water-cooled boxes. All the independent water-cooled boxes are connected in series by cooling water pipes, so that the cooling water flows through each independent water-cooled box according to the determined rules. This can effectively control the cooling of each resistor module and achieve good cooling effect for various selection methods of high-power DC load. 5. In this invention, each module is arranged vertically from bottom to top on the support frame inside the overall resistor box cabinet according to its heat output. They are then connected in series from bottom to top through water inlet pipes. This allows the cooling water to flow through the module with the highest heat output first, and then through each subsequent resistor module in decreasing order. This effectively matches the heat output with the cooling capacity, ensuring that each resistor module receives good and uniform heat dissipation and effectively reducing the phenomenon of uneven local heat dissipation. 6. This invention divides the overall load into multiple resistor modules and arranges the independent cooling water tanks of each resistor module in layers from bottom to top on the independent cooling water tank rack of the overall load cabinet according to their heat generation. All the independent cooling water tanks are connected in series by cooling water pipes according to their heat generation. The inlet and outlet of the series-connected independent cooling water tanks are then connected to the outlet and return of the cooling water pump station of the circulating water cooling system, forming an overall series cooling loop. This cooling method can effectively match the cooling water flow to the different heat generation of each independent cooling tank, so that each resistor module can receive appropriate cooling and effectively balance the cooling needs of each module.

[0040] It should be noted that the above-listed embodiments are merely a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention. Simultaneously, the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the present invention, should still fall within the scope of the technical content disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A method for cooling high-power DC loads based on variable modular combination, characterized in that: The high-power load is divided into multiple resistor modules. Each resistor module's load body is sealed and placed in an independent cooling water tank. All the independent cooling water tanks are then placed on a support frame inside the overall load cabinet. The inlets and outlets of all the independent cooling water tanks are connected in series according to thermal order through cooling water pipes to form an independent cooling water tank array. Cooling water flows through the inlets and outlets of all the independent cooling water tanks in sequence, carrying away the heat from the resistor modules in the independent cooling water tanks in layers, thus cooling and dissipating heat from the resistor load bodies of the resistor modules.

2. The high-power DC load cooling method based on variable modular combination according to claim 1, characterized in that: The process of dividing a high-power load into multiple resistor modules involves dividing a high-power DC load into multiple branch loads according to a determined load distribution principle. Each branch load is then composed of multiple resistor modules connected in series. These resistor modules can be combined to form multiple speed ranges. Through reasonable matching of these speed ranges, any speed range between 10kW and 1000kW can be formed, with a minimum speed range of 10kW and a minimum adjustment step of 10kW.

3. The high-power DC load cooling method based on variable modular combination according to claim 1, characterized in that: The process of sealing the resistive load of each resistive module and placing it in an independent cooling water tank involves placing the resistive load of each module inside the cooling pipe of its own independent cooling water tank. There is a water-cooled cavity outside the cooling pipe and inside the independent cooling water tank, and cooling water flows through the water-cooled cavity. The cooling water flowing through the tank carries away the heat of the resistive load installed in the metal pipe.

4. The high-power DC load cooling method based on variable modular combination according to claim 3, characterized in that: The resistive load body is a long strip-shaped tubular resistor tube. The tubular resistor tube is installed in the cooling pipe of an independent cooling water tank by locking nuts and sealing rings. The output terminals at both ends of the tubular resistor tube are connected in series and parallel to the contactor assembly and the negative busbar through connecting copper busbars and cables.

5. The high-power DC load cooling method based on variable modular combination according to claim 1, characterized in that: The process of placing all the independent cooling water tanks on the support frame inside the overall load box cabinet involves installing all the independent cooling water tanks layer by layer from top to bottom on the support frame inside the overall load box cabinet, with the independent cooling water tank of the resistor module with the highest heat generation placed on the bottom layer and the independent cooling water tank of the resistor module with the lowest heat generation placed on the top layer, and the middle layers arranged in descending order of heat generation from bottom to top; then, the cooling water channels of all the independent cooling water tanks are connected in series from bottom to top by cooling water pipes, so that the resistive load of all resistor modules is cooled from bottom to top.

6. The high-power DC load cooling method based on variable modular combination according to claim 5, characterized in that: The independent cooling water tank is a long, narrow box. Each independent cooling water tank has an inlet and an outlet on one side. The inlet and outlet are located at opposite ends of the same side. The inlet and outlet of each independent cooling water tank are connected to each other through cooling water pipes.

7. The high-power DC load cooling method based on variable modular combination according to claim 6, characterized in that: The inlet and outlet of each independent cooling water tank are interconnected by cooling water pipes. The inlet and outlet of the independent cooling water tanks are connected vertically by cooling water pipes, and the inlet of the upper module box is connected to the outlet of the lower layer, forming a multi-layer module box with cooling water connected from bottom to top.

8. The high-power DC load cooling method based on variable modular combination according to claim 7, characterized in that: The independent cooling water tank is equipped with a baffle plate in the water cooling cavity to ensure that the cooling water flows sequentially from the inlet to the outlet when it enters the water cooling cavity, ensuring that all resistive loads in the independent cooling water tank can be cooled evenly.

9. The high-power DC load cooling method based on variable modular combination according to claim 7, characterized in that: The cooling water pipe is connected to the inlet and outlet of the independent cooling water tank via a cooling water pipe connecting flange. The flow rate of the cooling water pipe is greater than 35 m³ / h, ensuring that all resistive loads in the independent cooling water tank can receive uniform heat dissipation.

10. The high-power DC load cooling method based on variable modular combination according to claim 7, characterized in that: The bottommost cooling water pipe and the topmost outlet pipe are each connected to a cooling water circulation system. The cooling water circulation system is located in a cooling water tank next to the cabinet-type enclosure. The cooling water circulation system provides more than 35 m³ / h of cooling water to the entire DC load, thus cooling the entire DC load with a large volume of cooling water.

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