Direct current power generation system and method of operation thereof

Abstract

The application belongs to the technical field of power generation, and particularly relates to a power supply device for automobile range extension, and more particularly to a direct-current power generation system and a working method thereof. The direct-current power generation system acquires the power of a power generation part in real time through a control module. When the power changes, the control module controls a pressurizing part to pressurize a power part cooling loop, and controls a connecting part to connect the power part cooling loop and the power generation part cooling loop, so that the high-pressure gas in the power part cooling loop enters the power generation part cooling loop, the gas pressure in the power generation part cooling loop is increased, the boiling point of the cooling liquid in the power generation part cooling loop is increased, and the cooling requirements of the power generation part and the power part are simultaneously met. When the power of the power generation part changes, the gas pressure in the power generation part cooling pipeline is increased, the boiling point of the cooling liquid therein is increased, and the cavitation effect caused by the local temperature rise and boiling of the cooling liquid due to the local eddy current caused by the power change is avoided.

Description

Technical Field

[0001] This invention belongs to the field of power generation technology, specifically relating to a power supply device for automobile range extenders, and more particularly to a DC power generation system and its operating method. Background Technology

[0002] In miniaturized power generation systems, such as 800V range extender systems, the cooling systems for the generator and power sides are shared. If a low-boiling-point, high-specific-heat-capacity coolant is selected, deionized water is typically used. The cooling tubes are placed close to the side of the generator's flat coil. When the generator's power changes, the voltage will change abruptly, which can easily cause localized eddy currents in the cooling tubes. These currents will be induced on the tube side, leading to a sudden temperature rise in the localized area. Localized liquid flashing can cause cavitation, thus affecting the lifespan of the cooling tubes. High-boiling-point coolants, due to their low specific heat capacity, cannot effectively remove heat from the generator and power sides, which is particularly evident in miniaturized power generation systems. At the same time, high-boiling-point coolants have poorer fluidity than low-boiling-point coolants, further affecting the heat dissipation system.

[0003] Therefore, due to the technical problem that the internal coolant cannot simultaneously meet the cooling requirements of both the generation and power sides in a miniaturized power generation system because the cooling system is shared by the generation and power sides, a new DC power generation system and its operating method need to be designed.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one DC power generation system and its operating method.

[0006] In a first aspect, embodiments of this disclosure provide a DC power generation system, including:

[0007] A control module, and a power unit, a generator unit, a communication unit, and a pressurization unit electrically connected to the control module;

[0008] The power unit is connected to the power generation unit, and the power unit is configured to drive the power generation unit to generate electricity;

[0009] The power unit is provided with a corresponding power unit cooling circuit, the power generation unit is provided with a corresponding power generation unit cooling circuit, and the power unit cooling circuit is connected to the power generation unit cooling circuit through a connecting part.

[0010] The pressurization section is connected to the cooling circuit of the power unit and the cooling circuit of the generator unit, respectively;

[0011] The control module is configured to acquire the power of the generator in real time, and when the power changes, control the pressurizing part to pressurize the cooling circuit of the power unit, and control the connecting part to connect the cooling circuit of the power unit and the cooling circuit of the generator unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the generator unit, increases the gas pressure in the cooling circuit of the generator unit, and increases the boiling point of the coolant in the cooling circuit of the generator unit.

[0012] In one optional embodiment, the power unit cooling circuit includes: a power unit cooling pipe disposed at the engine location in the power unit;

[0013] The inlet and outlet of the power unit cooling pipe are both connected to the water tank through a first one-way valve, and a first water pump electrically connected to the control module is provided between the water tank and the inlet of the power unit cooling pipe.

[0014] The control module is configured to control the first water pump to pump the coolant in the water tank into the power unit cooling pipe through the first one-way valve, and then the coolant flowing out of the outlet of the power unit cooling pipe flows into the water tank through the first one-way valve to form a power unit cooling circuit.

[0015] In one optional embodiment, the power generation cooling circuit includes: a power generation cooling pipe disposed at the generator in the power generation unit;

[0016] The cooling pipe of the generator part is a flat pipe and is closely attached to the side of the generator flat wire coil;

[0017] The inlet and outlet of the cooling pipe of the power generation unit are both connected to the water tank through a pressure reducing check valve assembly, and a second water pump electrically connected to the control module is provided between the water tank and the inlet of the cooling pipe of the power generation unit.

[0018] The control module is configured to control the second water pump to pump the coolant in the water tank into the cooling pipe of the generator unit through the pressure reducing check valve assembly, and then the coolant flowing out of the outlet of the cooling pipe of the generator unit flows into the water tank after passing through the pressure reducing check valve assembly, forming a cooling circuit for the generator unit.

[0019] In one alternative embodiment, the water tank is connected to a radiator, and the radiator dissipates heat from the coolant as it flows into the water tank.

[0020] In one alternative implementation, the connecting portion includes: a second check valve electrically connected to the control module;

[0021] The second check valve is connected to the cooling pipes of the power unit and the power generation unit via pipes;

[0022] The control module is configured to control the second one-way valve to open, so that the high-pressure gas in the power unit cooling pipe enters the generator cooling pipe, increasing the gas pressure in the generator cooling pipe and thus increasing the boiling point of the coolant in the generator cooling pipe.

[0023] In one optional embodiment, the pressurization unit includes: a pressurization pump electrically connected to the control module;

[0024] The pressurizing pump is connected to the pressure tank, the pressure tank is connected to the power unit cooling pipe, and the pressurizing pump is connected to the generator cooling pipe.

[0025] The control module is configured to control the pressurization pump to inject high-pressure gas into the pressure tank. The high-pressure gas is stored in the pressure tank and then enters the power unit cooling pipe to increase the gas pressure in the power unit cooling pipe.

[0026] In one optional implementation, the control module is electrically connected to the detection module, and the detection module is electrically connected to the power generation unit, so as to obtain the power of the power generation unit in real time through the detection module.

[0027] In one optional embodiment, the control module is configured to control the second check valve to close when the power of the generator is stable, maintain the air pressure in the cooling pipe of the generator at a second preset air pressure, and allow the high-pressure gas in the pressure tank to enter the cooling pipe of the power unit so that the air pressure in the cooling pipe of the power unit is maintained at the first preset air pressure.

[0028] The first preset air pressure is greater than the second preset air pressure.

[0029] In one alternative implementation, the control module is configured to control the second one-way valve to open when the power of the generator changes, allowing high-pressure gas in the power unit cooling pipe to enter the generator cooling pipe, increasing the gas pressure in the generator cooling pipe, thereby raising the boiling point of the coolant in the generator cooling pipe, while simultaneously the pressure tank continuously supplies pressure to the power unit cooling pipe.

[0030] Secondly, this disclosure also provides a method for operating the above-described DC power generation system, comprising:

[0031] The power of the generator is acquired in real time by the control module. When the power changes, the pressurization unit is controlled to pressurize the cooling circuit of the power unit, and the connecting unit is controlled to connect the cooling circuit of the power unit and the cooling circuit of the generator unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the generator unit, increasing the gas pressure in the cooling circuit of the generator unit, thereby increasing the boiling point of the coolant in the cooling circuit of the generator unit.

[0032] The beneficial effects of this invention are that the DC power generation system obtains the power of the power generation unit in real time through the control module. When the power changes, the pressurization unit is controlled to pressurize the cooling circuit of the power unit, and the connecting unit is controlled to connect the cooling circuit of the power unit and the cooling circuit of the power generation unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the power generation unit, increasing the gas pressure in the cooling circuit of the power generation unit, thereby increasing the boiling point of the coolant in the cooling circuit of the power generation unit. This achieves the simultaneous satisfaction of the cooling needs of the power generation unit and the power unit. Furthermore, when the power of the power generation unit changes, the gas pressure in the cooling pipe of the power generation unit is increased, thereby increasing the boiling point of the coolant therein, avoiding the cavitation effect caused by local eddy currents generated by power changes leading to local heating and boiling of the coolant.

[0033] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A schematic diagram of a DC power generation system provided in an embodiment of this disclosure;

[0037] Figure 2 A schematic block diagram of a DC power generation system provided in this disclosure embodiment;

[0038] Figure 3 This is a power detection flowchart provided in an embodiment of the present disclosure. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0040] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0041] In miniaturized power generation systems, such as 800V range extender systems, the cooling systems for the generator and power sides are shared, typically using deionized water. The cooling flat tubes are placed close to the side of the generator's flat coil. When the generator power changes, local eddy currents are generated in the cooling flat tubes, which induce currents on the side of the flat tubes, causing a sudden temperature rise in localized areas. Localized liquid flashing leads to cavitation, thus affecting the lifespan of the flat tubes. High-boiling-point coolants have low specific heat capacity and cannot effectively remove heat from the generator and power sides, which is particularly evident in miniaturized power generation systems. At the same time, high-boiling-point coolants have poor fluidity, which further affects the heat dissipation system.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0044] like Figure 1 and Figure 2As shown, at least one disclosed embodiment provides a DC power generation system, including: a control module, and a power unit, a power generation unit, a connecting unit, and a pressurizing unit electrically connected to the control module; the power unit is connected to the power generation unit and configured to drive the power generation unit to generate electricity; a corresponding power unit cooling circuit is provided at the power unit, and a corresponding power generation unit cooling circuit is provided at the power generation unit, the power unit cooling circuit being connected to the power generation unit cooling circuit via the connecting unit; the pressurizing unit is connected to both the power unit cooling circuit and the power generation unit cooling circuit; the control module is configured to acquire the power output of the power generation unit in real time. When the power changes, the pressurizing unit pressurizes the cooling circuit of the power unit and controls the connecting unit to connect the cooling circuit of the power unit and the cooling circuit of the generator unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the generator unit, increasing the gas pressure in the cooling circuit of the generator unit, thereby increasing the boiling point of the coolant in the cooling circuit of the generator unit. This achieves the simultaneous satisfaction of the cooling needs of the generator unit and the power unit. Furthermore, when the power of the generator unit changes, the gas pressure in the cooling pipe of the generator unit is increased, which increases the boiling point of the coolant therein, avoiding the cavitation effect caused by local eddy currents generated by power changes leading to local heating and boiling of the coolant.

[0045] In this embodiment, the coolant can be deionized water.

[0046] like Figure 1 As shown, in one optional embodiment, the power unit cooling circuit includes: a power unit cooling pipe disposed at the engine location in the power unit; specifically, the coolant flow direction in the power unit cooling circuit is as follows. Figure 1 As shown in F1; the inlet and outlet of the power unit cooling pipe are both connected to the water tank through a first one-way valve, and a first water pump electrically connected to the control module is provided between the water tank and the inlet of the power unit cooling pipe; the control module is configured to control the first water pump to pump the coolant in the water tank into the power unit cooling pipe through the first one-way valve, and then the coolant flowing out of the outlet of the power unit cooling pipe flows into the water tank after passing through the first one-way valve, forming a power unit cooling circuit.

[0047] In this embodiment, the engine can be an internal combustion engine.

[0048] In this embodiment, when the power changes abruptly, the pressurizing unit pressurizes the cooling circuit of the power unit and the connecting unit connects the cooling circuit of the power unit and the cooling circuit of the generator unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the generator unit, increasing the gas pressure in the cooling circuit of the generator unit, thereby increasing the boiling point of the coolant in the cooling circuit of the generator unit. At this time, when the coolant flows out of the cooling pipe of the generator unit, it is quickly depressurized through the pressure reducing check valve assembly to maintain the effect of the coolant.

[0049] In this embodiment, the first water pump can pump the coolant in the water tank into the power unit cooling pipe, and then back into the water tank to complete the cooling cycle. The first one-way valve ensures that the circulation of coolant in the power unit cooling circuit is limited to the coolant in the water tank entering the power unit cooling pipe through the first water pump and then flowing back into the water tank.

[0050] like Figure 1 As shown, in one optional embodiment, the power generation unit cooling circuit includes: a power generation unit cooling pipe disposed at the generator in the power generation unit; specifically, the coolant flow direction in the power generation unit cooling circuit is as follows: Figure 1 As shown in F2; the cooling pipe of the generator part is a flat pipe and is close to the side of the flat coil of the generator; the inlet and outlet of the cooling pipe of the generator part are both connected to the water tank through a pressure reducing check valve assembly, and a second water pump electrically connected to the control module is provided between the water tank and the inlet of the cooling pipe of the generator part; the control module is configured to control the second water pump to pump the coolant in the water tank into the cooling pipe of the generator part through the pressure reducing check valve assembly, and then the coolant flowing out of the outlet of the cooling pipe of the generator part flows into the water tank after passing through the pressure reducing check valve assembly, forming a cooling circuit for the generator part.

[0051] In this embodiment, the second water pump can pump the coolant in the water tank into the cooling pipe of the generator part, and then back into the water tank to complete the cooling cycle. The pressure reducing check valve assembly ensures that the circulation of coolant in the cooling circuit of the generator part is only the coolant in the water tank enters the cooling pipe of the generator part through the second water pump and then flows back into the water tank.

[0052] In this embodiment, the cooling circuits of the power generation unit and the power unit share a single water tank, which meets the miniaturization requirements of the power generation system and reduces the space required.

[0053] In this embodiment, the generator used in the power generation section can be a high-speed permanent magnet synchronous motor. The stator winding of the high-speed permanent magnet synchronous motor adopts a flat wire hairpin winding and is impregnated with a high thermal conductivity insulating material. This winding not only reduces AC losses, but its flat cross-section is also directly attached to the side of the cooling pipe of the power generation section.

[0054] In this embodiment, the power generation unit may also include a three-phase active rectifier based on silicon carbide devices, wherein the SiCMOSFET power module is directly brazed to the other side of the cooling pipe of the power generation unit through a DBC ceramic substrate, and shares the same cooling circuit with the stator winding.

[0055] In this embodiment, the pressure reducing check valve assembly, namely the one-way pressure reducing valve, combines the functions of a pressure reducing valve and a check valve.

[0056] In one alternative embodiment, the water tank is connected to a radiator, and the radiator dissipates heat from the coolant as it flows into the water tank.

[0057] like Figure 1 As shown, in one optional embodiment, the connecting portion includes: a second check valve electrically connected to the control module; the second check valve is connected to the power unit cooling pipe and the generator cooling pipe via pipes; the control module is configured to control the second check valve to open, so that high-pressure gas in the power unit cooling pipe enters the generator cooling pipe, increasing the gas pressure in the generator cooling pipe, thereby increasing the boiling point of the coolant in the generator cooling pipe; the specific high-pressure gas flow direction at this time is as follows: Figure 1 As shown in F3.

[0058] In this embodiment, when the power of the generator is stable, the second one-way valve is closed. At this time, the high-pressure gas in the cooling pipe of the power unit cannot enter the cooling pipe of the generator unit. The cooling pipe of the power unit is under high pressure to meet the cooling requirements of the power unit, while the cooling pipe of the generator unit is under low pressure to meet the cooling requirements of the generator unit.

[0059] In one optional embodiment, the pressurization unit includes: a pressurization pump electrically connected to the control module; the pressurization pump is connected to a pressure tank, the pressure tank is connected to a power unit cooling pipe, and the pressurization pump is connected to a generator cooling pipe; the control module is configured to control the pressurization pump to inject high-pressure gas into the pressure tank, the high-pressure gas is stored in the pressure tank, and the high-pressure gas in the pressure tank enters the power unit cooling pipe to increase the gas pressure in the power unit cooling pipe.

[0060] In this embodiment, the pressurizing pump can be connected to the cooling pipe of the power generation unit. The gas pressurized by the pressurizing pump can be the gas in the cooling pipe of the power generation unit or other gas sources. When the power of the power generation unit returns to stability after a change, the high-pressure gas in the cooling pipe of the power generation unit can be extracted, so that the gas pressure in the cooling pipe of the power generation unit will be reduced again.

[0061] In one optional implementation, the control module is electrically connected to the detection module, and the detection module is electrically connected to the power generation unit, so as to obtain the power of the power generation unit in real time through the detection module.

[0062] In this embodiment, the detection module can be a voltage sensor, a current sensor, etc., to detect the power of the generator in the power generation section.

[0063] In this embodiment, the power of the generator is in a stable state when it is working. When the power changes, local eddy currents are generated in the cooling pipe of the generator, which causes a sudden increase in local temperature in the cooling pipe and local liquid flash evaporation, resulting in cavitation. Therefore, it is necessary to increase the air pressure in the cooling pipe of the generator when the power of the generator changes to prevent the coolant from boiling.

[0064] In one optional embodiment, the control module is configured to control the second one-way valve to close when the power of the generator is stable, maintain the air pressure in the cooling pipe of the generator at a second preset air pressure, and allow high-pressure gas in the pressure tank to enter the cooling pipe of the power unit, so that the air pressure in the cooling pipe of the power unit increases and is maintained at a first preset air pressure; wherein the first preset air pressure is greater than the second preset air pressure.

[0065] In this embodiment, both the cooling pipes of the power generation unit and the cooling pipes of the power unit can be equipped with air pressure sensors electrically connected to the control module to detect the air pressure in the corresponding pipes.

[0066] In this embodiment, the first preset air pressure can be set according to the cooling requirements of the power unit, and the second preset air pressure can be set according to the cooling requirements of the power generation unit.

[0067] like Figure 3 As shown, in one optional embodiment, the control module is configured to control the second one-way valve to open when the power of the generator changes, so that the high-pressure gas in the power unit cooling pipe enters the generator cooling pipe, the gas pressure in the generator cooling pipe increases, the boiling point of the coolant in the generator cooling pipe increases, and at the same time the pressure tank continuously supplies pressure to the power unit cooling pipe.

[0068] In this embodiment, when the power of the generator changes, the pressurization pump can inject high-pressure gas into the pressure tank. After the high-pressure gas enters the cooling pipe of the power unit, it can enter the cooling pipe of the generator unit through the second one-way valve, thereby increasing the gas pressure in the cooling pipe of the generator unit.

[0069] In this embodiment, the coolant flowing out of the cooling pipe of the power generation unit can be depressurized by passing through the pressure reducing check valve assembly.

[0070] At least one other disclosed embodiment also provides a method of operating the DC power generation system described above, comprising: acquiring the power of the power generation unit in real time through a control module; controlling the pressurizing unit to pressurize the cooling circuit of the power unit when the power changes; and controlling the connecting unit to connect the cooling circuit of the power unit and the cooling circuit of the power generation unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the power generation unit, thereby increasing the gas pressure in the cooling circuit of the power generation unit and increasing the boiling point of the coolant in the cooling circuit of the power generation unit.

[0071] In summary, this DC power generation system acquires the power of the generator section in real time through the control module. When the power changes, it controls the pressurization section to pressurize the cooling circuit of the power section and controls the connecting section to connect the cooling circuits of the power section and the generator section, so that the high-pressure gas in the cooling circuit of the power section enters the cooling circuit of the generator section, increasing the gas pressure in the cooling circuit of the generator section and raising the boiling point of the coolant in the cooling circuit of the generator section. This achieves the simultaneous satisfaction of the cooling needs of the generator section and the power section. Furthermore, when the power of the generator section changes, it increases the gas pressure in the cooling pipe of the generator section, raising the boiling point of the coolant and avoiding cavitation caused by local eddy currents due to power changes leading to localized heating and boiling of the coolant.

[0072] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0073] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0075] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A DC power generation system, characterized in that, include: A control module, and a power unit, a generator unit, a communication unit, and a pressurization unit electrically connected to the control module; The power unit is connected to the power generation unit, and the power unit is configured to drive the power generation unit to generate electricity; The power unit is provided with a corresponding power unit cooling circuit, the power generation unit is provided with a corresponding power generation unit cooling circuit, and the power unit cooling circuit is connected to the power generation unit cooling circuit through a connecting part. The pressurization section is connected to the cooling circuit of the power unit and the cooling circuit of the generator unit, respectively; The control module is configured to acquire the power of the generator in real time, and when the power changes, control the pressurizing part to pressurize the cooling circuit of the power unit, and control the connecting part to connect the cooling circuit of the power unit and the cooling circuit of the generator unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the generator unit, increases the gas pressure in the cooling circuit of the generator unit, and increases the boiling point of the coolant in the cooling circuit of the generator unit. The power unit cooling circuit includes: a power unit cooling pipe installed at the engine location in the power unit; The inlet and outlet of the power unit cooling pipe are both connected to the water tank through a first one-way valve, and a first water pump electrically connected to the control module is provided between the water tank and the inlet of the power unit cooling pipe. The control module is configured to control the first water pump to pump the coolant in the water tank into the power unit cooling pipe through the first check valve, and then the coolant flowing out of the outlet of the power unit cooling pipe flows into the water tank through the first check valve to form a power unit cooling circuit. The cooling circuit for the power generation unit includes: a power generation unit cooling pipe installed at the generator in the power generation unit; The cooling pipe of the generator part is a flat pipe and is closely attached to the side of the generator flat wire coil; The inlet and outlet of the cooling pipe of the power generation unit are both connected to the water tank through a pressure reducing check valve assembly, and a second water pump electrically connected to the control module is provided between the water tank and the inlet of the cooling pipe of the power generation unit. The control module is configured to control the second water pump to pump the coolant in the water tank into the cooling pipe of the generator unit through the pressure reducing check valve assembly, and then the coolant flowing out of the outlet of the cooling pipe of the generator unit flows into the water tank after passing through the pressure reducing check valve assembly, forming a cooling circuit for the generator unit.

2. The DC power generation system as described in claim 1, characterized in that: The water tank is connected to the radiator, and when the coolant flows into the water tank, the radiator dissipates the heat from the coolant.

3. The DC power generation system as described in claim 1, characterized in that: The connecting part includes: a second one-way valve electrically connected to the control module; The second check valve is connected to the cooling pipes of the power unit and the power generation unit via pipes; The control module is configured to control the second one-way valve to open, so that the high-pressure gas in the power unit cooling pipe enters the generator cooling pipe, increasing the gas pressure in the generator cooling pipe and thus increasing the boiling point of the coolant in the generator cooling pipe.

4. The DC power generation system as described in claim 3, characterized in that: The pressurization unit includes: a pressurization pump electrically connected to the control module; The pressurizing pump is connected to the pressure tank, the pressure tank is connected to the power unit cooling pipe, and the pressurizing pump is connected to the generator cooling pipe. The control module is configured to control the pressurization pump to inject high-pressure gas into the pressure tank. The high-pressure gas is stored in the pressure tank and then enters the power unit cooling pipe to increase the gas pressure in the power unit cooling pipe.

5. The DC power generation system as described in claim 1, characterized in that: The control module is electrically connected to the detection module, and the detection module is electrically connected to the power generation unit, so as to obtain the power of the power generation unit in real time through the detection module.

6. The DC power generation system as described in claim 4, characterized in that: The control module is configured to close the second check valve when the power of the generator is stable, maintain the air pressure in the cooling pipe of the generator at the second preset air pressure, and allow the high-pressure gas in the pressure tank to enter the cooling pipe of the power unit so that the air pressure in the cooling pipe of the power unit increases and is maintained at the first preset air pressure. The first preset air pressure is greater than the second preset air pressure.

7. The DC power generation system as described in claim 4, characterized in that: The control module is configured to open the second one-way valve when the power of the generator changes, allowing high-pressure gas in the power unit cooling pipe to enter the generator cooling pipe, increasing the gas pressure in the generator cooling pipe and raising the boiling point of the coolant in the generator cooling pipe. At the same time, the pressure tank continuously supplies pressure to the power unit cooling pipe.

8. A method for operating a DC power generation system as described in any one of claims 1-7, characterized in that, include: The power of the generator is acquired in real time by the control module. When the power changes, the pressurization unit is controlled to pressurize the cooling circuit of the power unit, and the connecting unit is controlled to connect the cooling circuit of the power unit and the cooling circuit of the generator unit, so that the high-pressure gas in the cooling circuit of the power unit enters the cooling circuit of the generator unit, increasing the gas pressure in the cooling circuit of the generator unit, thereby increasing the boiling point of the coolant in the cooling circuit of the generator unit.

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