CN110582186A - Liquid cooling type photovoltaic high-voltage direct-current series grid-connected system - Google Patents
Liquid cooling type photovoltaic high-voltage direct-current series grid-connected system Download PDFInfo
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- CN110582186A CN110582186A CN201910897841.XA CN201910897841A CN110582186A CN 110582186 A CN110582186 A CN 110582186A CN 201910897841 A CN201910897841 A CN 201910897841A CN 110582186 A CN110582186 A CN 110582186A
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- condenser
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20936—Liquid coolant with phase change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a liquid cooling type photovoltaic high-voltage direct current series grid-connected system, which comprises a DC-DC converter and a cooling device, wherein the cooling device comprises a first cooling device and a second cooling device; the DC-DC converter comprises a low-voltage DC-AC converter, a high-frequency transformer and a high-voltage AC-DC converter; the output end of the low-voltage DC-AC converter is connected with the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected with the input end of the high-voltage AC-DC converter; the cooling device comprises a condenser, an evaporator, a gas pipeline, a liquid pipeline and insulating cooling liquid; the low-voltage DC-AC converter comprises an inductor, the evaporator is filled with insulating cooling liquid, and the inductor, the high-frequency transformer and the high-voltage AC-DC converter are immersed in the insulating cooling liquid; the condenser is arranged above the evaporator, the air outlet joint of the evaporator is connected with the air inlet joint of the condenser through a gas pipeline, and the liquid outlet joint of the condenser is connected with the liquid inlet joint of the evaporator through a liquid pipeline. The invention enables the high-voltage component to be soaked in the insulating cooling liquid, improves the deployment density of the heating electric component and simultaneously improves the heat dissipation efficiency of the heating electric component.
Description
Technical Field
The invention relates to the technical field of grid connection of photovoltaic power generation systems, in particular to a liquid cooling type photovoltaic high-voltage direct-current series grid connection system.
Background
With the construction of a high-voltage direct-current power transmission network and the rapid development of a high-voltage direct-current power distribution network, the direct-current grid-connected DC-DC converter is an effective means for solving the problems of large-capacity long-distance transmission of electric energy and large-scale renewable energy collection, and can fully utilize a corridor of the high-voltage direct-current power transmission line to realize complementation among multiple energy forms and multiple user types.
the grid-connected form of the photovoltaic power generation system which is common at present is mainly integrated into an alternating current power grid. The flexible direct current and traditional direct current transmission in China are rapidly developed, demonstration projects are more and more, and photovoltaic power generation must have the capacity of being connected into a high-voltage direct current transmission network. A general photovoltaic high-voltage direct-current series grid-connected system comprises a DC-DC converter, wherein the DC-DC converter comprises a low-voltage DC-AC conversion device, a high-frequency transformer and a high-voltage AC-DC conversion device. The existing low voltage DC-AC converter comprises: low-voltage capacitor, IGBT, inductor and other parts; the existing high voltage AC-DC converter includes: high-voltage capacitor, silicon stack, etc. for realizing AC/DC conversion function.
The common photovoltaic direct current converters have the problems that the output voltage is low and the voltage cannot be boosted to a high voltage at one time, in order to realize that the output of a photovoltaic system is merged into a high-voltage direct current power grid, a plurality of photovoltaic direct current converters are generally adopted to input independent photovoltaic components at present, and the output voltage of the system is improved in a mode of outputting series connection, so that the aim of outputting higher direct current voltage to be connected into the high-voltage direct current power grid is fulfilled. The output of the converter is merged into a direct current transmission line with more than +/-10 KV, +/-30 KV and +/-300 KV levels. The boosting ratio is up to 20-600 times. The high voltage and the low voltage of the whole system are in the same cabinet, and the improvement of the power density of equipment and the higher voltage-resistant grade are a pair of spears, which brings great difficulty to the structural design.
Because the high-power converter has larger heat loss in the operation process, a set of cooling system must be equipped for ensuring the converter to have good operation environment. The most common cooling technology of the current converter is an air cooling or water cooling mode, the air cooling mode has a simple structure, but has low cooling efficiency, large volume and noise, is suitable for low-power equipment, is difficult to adapt to the technical development requirement above MW, and the water cooling can meet the current cooling requirement. And once water leaks, the operation of high-voltage equipment can bring potential safety hazards. Therefore, the development and selection of a novel efficient heat dissipation technology for cooling the converter equipment are important measures for ensuring the reliability of the device and improving the power volume density.
Meanwhile, the equipment belongs to high-voltage equipment, the insulation thickness and the insulation distance of the equipment are influenced when the insulation withstand voltage strength reaches the level of more than +/-10 KV, +/-30 KV and +/-300 KV, the miniaturization and heat dissipation design of the equipment is influenced, certain difficulty is brought to the structural design of the equipment, air insulation is adopted for high-voltage components in the conventional converter at present, the common air withstand voltage strength is 2.5KV/mm, and a main high-voltage component high-frequency high-voltage transformer is in a dry type or oil immersion type. The oil immersed type is viscous, so that dirt around equipment is easy to gather, the discharge breakdown is caused to influence the safety of the equipment, the oil value needs to be changed periodically, and the maintenance workload is large. The dry type transformer has larger volume which is 4-5 times of oil cooling, which is not beneficial to the miniaturization of equipment.
Disclosure of Invention
The invention aims to provide a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system, which enables high-voltage components to be soaked in insulating cooling liquid, improves the deployment density of heating electrical components and improves the heat dissipation efficiency of the heating electrical components.
In order to achieve the purpose, the invention provides the following scheme:
A liquid cooling type photovoltaic high-voltage direct current series grid-connected system is characterized by comprising a DC-DC converter and a cooling device; the DC-DC converter comprises a low-voltage DC-AC converter, a high-frequency transformer and a high-voltage AC-DC converter;
The output end of the low-voltage DC-AC converter is connected with the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected with the input end of the high-voltage AC-DC converter;
The cooling device comprises a condenser, an evaporator, a gas pipeline, a liquid pipeline and insulating cooling liquid; the low-voltage DC-AC converter comprises an inductor, the insulating cooling liquid is filled in the evaporator, and the inductor, the high-frequency transformer and the high-voltage AC-DC converter are immersed in the insulating cooling liquid;
The condenser is arranged in the evaporimeter top, the joint of giving vent to anger of evaporimeter passes through the gas line with the air inlet joint of condenser is connected, the play liquid joint of condenser passes through the liquid line with the liquid inlet joint of evaporimeter links to each other.
optionally, the low-voltage DC-AC converter further comprises a power semiconductor device, and the power semiconductor device is in contact with the outer wall of the evaporator.
Optionally, the low voltage DC-AC converter is immersed in the insulating cooling liquid of the evaporator.
Optionally, the insulating cooling liquid is a fluorocarbon.
Optionally, the condenser still includes pressure transmitter and exhaust joint, pressure transmitter is used for detecting the pressure of condenser, the exhaust joint connection valve is worked as when pressure reaches the setting value, through the exhaust joint exhaust.
Optionally, the evaporator is a sealed box, the bottom surface and the side surface of the evaporator are made of metal materials, the top surface of the evaporator is made of an insulating material, two high-voltage lead connectors are arranged on the top surface, the high-voltage lead connectors are hermetically connected with a high-voltage lead sleeve, a high-voltage lead at the output end of the DC-DC converter is sleeved in the high-voltage lead sleeve through the high-voltage lead connectors, and the high-voltage lead sleeve is filled with the insulating cooling liquid.
Optionally, the condenser includes at least one air inlet joint and at least one liquid outlet joint, and the air inlet joint is located above the liquid outlet joint.
Optionally, the evaporator comprises at least one of the air outlet joint and at least one of the liquid inlet joint, and the air outlet joint is located above the liquid inlet joint.
Optionally, the system further comprises a cabinet, wherein the DC-DC converter and the evaporator are disposed in the cabinet.
Optionally, the condenser adopts circulating cooling water or circulating cold air for refrigeration.
According to the invention content provided by the invention, the invention discloses the following technical effects: the invention provides a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system which comprises a DC-DC converter and a cooling device, wherein an inductor, a high-frequency transformer and a high-voltage AC-DC converter in a low-voltage DC-AC converter are immersed in insulating cooling liquid in an evaporator, a high-voltage component is insulated by the insulating cooling liquid, compared with the air, the insulating distance is shortened, the arrangement density of heating electric components is improved, the insulating cooling liquid absorbs heat of electric elements and dissipates the heat through the evaporator and a condenser, the heat generated by a dispersed heating source can be transmitted and dissipated in a centralized manner, and the heat dissipation efficiency of the heating electric components is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a front view of a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system according to an embodiment of the invention;
FIG. 2 is a schematic side view of a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system according to an embodiment of the present invention;
FIG. 3 is a detailed structural schematic diagram of a DC-DC converter in a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system according to an embodiment of the present invention;
Description of reference numerals: 1-cabinet, 2-condenser, 3-DC-DC converter, 4-gas pipeline, 5-liquid pipeline, 6-high-voltage lead bushing, 7-cooling liquid, 21-pressure transmitter, 22-exhaust valve, 23-air inlet connector, 24-liquid outlet connector, 31-high-frequency transformer, 32-high-voltage capacitor, 33-silicon stack, 34-inductor, 35-power semiconductor device, 36-evaporator, 41-air outlet connector, 51-liquid inlet connector and 61-high-voltage lead connector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system, which enables high-voltage components to be soaked in insulating cooling liquid, improves the deployment density of heating electrical components and improves the heat dissipation efficiency of the heating electrical components.
in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
as shown in fig. 1-3, the invention discloses a liquid-cooled photovoltaic high-voltage direct-current series grid-connected system, which comprises a cabinet 1, a DC-DC converter 3 and a cooling device; the DC-DC converter 3 includes a low-voltage DC-AC converter, a high-frequency transformer, and a high-voltage AC-DC converter.
The output end of the low-voltage DC-AC converter is connected with the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected with the input end of the high-voltage AC-DC converter.
The low-voltage DC-AC converter includes: low-voltage capacitor, power semiconductor device, inductor, etc. The high-voltage AC-DC converter includes: and the high-voltage capacitor 32, the silicon stack 33 and the like realize the alternating current-direct current conversion function.
The cooling device comprises a condenser 2, an evaporator 36, a gas pipeline 4, a liquid pipeline 5 and insulating cooling liquid 7; the evaporator 36 is filled with insulating cooling liquid 7, the inductor 34, the high-frequency transformer and the high-voltage AC-DC converter are immersed in the insulating cooling liquid 7, and due to the insulativity of the insulating cooling liquid 7, the withstand voltage strength of the insulating cooling liquid 7 reaches 22KV/mm, so that point components can be placed in the insulating cooling liquid 7, the dense arrangement of high-voltage components in a limited space is realized, and the insulating cooling liquid 7 can play a role in heat dissipation; the other low-voltage DC-AC conversion devices except the inductor 34 are arranged on the outer wall of the evaporator 36, and are characterized in that the power semiconductor device 35 is required to be in close contact with the outer wall of the evaporator 36, so that heat exchange between the power semiconductor device 35 and insulating cooling liquid in the evaporator 36 is facilitated, the operating temperature of the power semiconductor device 35 of a high-heat-generating component is reduced, the reliability is improved, and meanwhile, the maintenance of vulnerable components is facilitated, and the power semiconductor device 35 is an Insulated Gate Bipolar Transistor (IGBT); the other scheme is that the low-voltage DC-AC converter, the high-frequency transformer and the high-voltage AC-DC converter are all arranged in the evaporator 36, so that the heat dissipation effect is better, and the modular design of the DC-DC converter is easy to realize.
The condenser 2 is placed above the evaporator 36, and the condenser 2 is higher than the evaporator 36 to prevent the gas from rising into the condenser 2 and carrying too much liquid to affect the condensation efficiency. The air outlet joint 41 of the evaporator 36 is connected with the air inlet joint 23 of the condenser 2 through the air pipeline 4, the liquid outlet joint 24 of the condenser 2 is connected with the liquid inlet joint 51 of the evaporator 36 through the liquid pipeline 5 to form a closed loop, and the closed loop is filled with low-boiling point insulating cooling liquid 7. When the alternating current-direct current conversion operation is realized, heat generated by the inductor 34, the high-frequency transformer and the high-voltage AC-DC converter is transferred to the insulating cooling liquid 7, the insulating cooling liquid 7 absorbs heat and is gasified, gas generated by gasification enters the condenser 2 along the gas pipeline 4 to be condensed into liquid by depending on the gravity difference principle of the gas and the liquid, and the liquid flows back to the evaporator 36 along the liquid pipeline 5, so that the purpose of heat dissipation is achieved, the circulation is repeated, the self-circulation process of the insulating cooling liquid is realized, and the noise and the cost are reduced.
The insulating cooling liquid 7 is fluorocarbon, has good insulativity, the compressive strength reaches 22KV/mm, and is a standardThe boiling point is 40-55 ℃ under atmospheric pressure, and the volume resistivity is more than 107Omega m, good fluidity and viscosity of 0.4-0.7mm2the system has the advantages that the system is simple in structure, the power density is greatly improved compared with an air cooling mode, the integrated design is safe, the heat dissipation effect is good, and the heating surface temperature of a device soaked in the system can be controlled below 65 ℃.
The evaporator 36 is a sealed box body, the bottom surface and the side surface of the evaporator 36 are made of metal materials or insulating materials, the top surface of the evaporator 36 is made of insulating materials, two high-voltage lead connectors 61 with sealing structures are arranged on the top surface, the high-voltage lead connectors 61 are connected with the high-voltage lead sleeve 6 in a sealing mode, a high-voltage lead at the output end of the DC-DC converter 3 is sleeved into the high-voltage lead sleeve 6 through the high-voltage lead connectors, two ends of the high-voltage lead are connected with the top surface of the evaporator 36 in a sealing mode through the sealing structures, the high-voltage lead sleeve 6 is communicated with the evaporator 36 through the lead connector structures, the high-voltage lead sleeve 6 is filled with insulating cooling liquid media 7 for insulation, due to the fact that the high-voltage lead connectors are not in contact with air in external sealing, air channels are not formed among the evaporators 36, the insulation distance among, the volume of the equipment cabinet is greatly reduced. The evaporator 36 is made of a metal box material, and aims to ensure the strength of the whole equipment, because the high-low voltage DC-DC converter, the transformer and the liquid medium are designed to be modular and have heavy weight, more than 150KG, and the strength of the insulating material cannot reach the strength under the same thickness, and the evaporator 36 is made of the metal box material and can be used as the ground of the whole cabinet system, so that a plurality of DC-DC converters can be densely arranged, and the power density of the system is improved.
the condenser 2 is a rectangular or cylindrical cavity body made of metal materials such as stainless steel or aluminum alloy, the condenser 2 comprises at least one air inlet joint 23 and at least one liquid outlet joint 24, and the air inlet joint 23 is positioned above the liquid outlet joint 24. The condenser 2 also comprises a pressure transmitter 21 and 2 exhaust joints, each exhaust joint is provided with an exhaust valve 22, one exhaust valve 22 is used for exhausting air by means, the other exhaust valve 22 is used for automatically exhausting air, the pressure transmitter 21 is used for detecting the pressure of the condenser 2, and when the pressure reaches a set value, the exhaust valve 22 on the exhaust joint exhausts air, so that the condenser is kept at a lower pressure to operate, and the safety of the system is improved.
At least one air outlet joint 41 at the upper part of the evaporator 36 is communicated with the gas pipeline 4, at least one liquid inlet joint 51 at the lower part of the evaporator 36 is communicated with the liquid pipeline, and the air outlet joint 41 is positioned above the liquid inlet joint 51 so as to ensure that the insulating cold area liquid flows back to the evaporator 36 without forming air blockage.
The DC-DC converters 3 and the evaporators 36 are arranged in the cabinet 1, the DC-DC converters 3 correspond to the evaporators 36 one by one, and a plurality of groups of the DC-DC converters 3 and the evaporators 36 can share one condenser 2, one set of the gas management 4 and the liquid pipeline 5. The condenser 2 can be arranged in the cabinet 1 or outside the cabinet 1.
The condenser 2 is preferably designed integrally with the top of the cabinet 1, that is, the shell of the condenser 2 is coplanar with the cabinet 1, and the condenser 2 is refrigerated by circulating cooling water or circulating cold air.
The invention provides a liquid cooling type photovoltaic high-voltage direct-current series grid-connected system, which utilizes a liquid-gas phase-change heat exchange principle to form a self-circulation closed structure without auxiliary treatment equipment such as pumps and the like; the cooling liquid is insulating cooling liquid, and due to the good insulating property of the medium, the high-voltage component can be soaked in the liquid, and compared with the insulating distance in the air, the insulating distance is shortened by more than 8 times, so that the high-density arrangement of the heating electrical component in a limited space is realized, and the heat dissipation problem caused by high-power-density electric energy conversion is solved; the operation pressure of the self-circulation closed structure is basically near 0Pa, namely the cooling device normally works between 0Pa and 105Pa, the working pressure is lower, the vacuumizing is not needed, and the working pressure of the water cooling mode is about 0.2MPA or more, so that the system is simple in structure and the cost is reduced; in addition, a plurality of dispersed heating sources generate heat to be transmitted in a centralized manner and radiate the heat, so that the operation of the totally-enclosed cabinet body of the high-power converter is realized, and the high-power converter is suitable for the humid and severe environment conditions of deserts, seas, ships and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A liquid cooling type photovoltaic high-voltage direct current series grid-connected system is characterized by comprising a DC-DC converter and a cooling device; the DC-DC converter comprises a low-voltage DC-AC converter, a high-frequency transformer and a high-voltage AC-DC converter;
the output end of the low-voltage DC-AC converter is connected with the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected with the input end of the high-voltage AC-DC converter;
The cooling device comprises a condenser, an evaporator, a gas pipeline, a liquid pipeline and insulating cooling liquid; the low-voltage DC-AC converter comprises an inductor, the insulating cooling liquid is filled in the evaporator, and the inductor, the high-frequency transformer and the high-voltage AC-DC converter are immersed in the insulating cooling liquid;
The condenser is arranged in the evaporimeter top, the joint of giving vent to anger of evaporimeter passes through the gas line with the air inlet joint of condenser is connected, the play liquid joint of condenser passes through the liquid line with the liquid inlet joint of evaporimeter links to each other.
2. the liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, wherein the low-voltage DC-AC converter further comprises a power semiconductor device, and the power semiconductor device is in contact with an outer wall of the evaporator.
3. the liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, wherein the low-voltage DC-AC converter is immersed in the insulating cooling liquid of the evaporator.
4. The liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, wherein the insulating coolant is fluorocarbon.
5. The liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, wherein the condenser further comprises a pressure transmitter and an exhaust joint, the pressure transmitter is used for detecting the pressure of the condenser, and when the pressure reaches a set value, the exhaust joint exhausts the gas.
6. The liquid-cooled photovoltaic high-voltage direct-current series grid-connected system according to claim 1, wherein the evaporator is a sealed box body, the bottom surface and the side surface of the evaporator are made of metal materials, the top surface of the evaporator is made of insulating materials, two high-voltage lead connectors are arranged on the top surface, the high-voltage lead connectors are connected with a high-voltage lead sleeve in a sealing mode, a high-voltage lead at the output end of the DC-DC converter is sleeved into the high-voltage lead sleeve through the high-voltage lead connectors, and the high-voltage lead sleeve is filled with the insulating cooling liquid.
7. The liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, wherein the condenser comprises at least one air inlet joint and at least one liquid outlet joint, and the air inlet joint is located above the liquid outlet joint.
8. The liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, wherein the evaporator comprises at least one air outlet joint and at least one liquid inlet joint, and the air outlet joint is located above the liquid inlet joint.
9. the liquid-cooled photovoltaic high-voltage direct current series grid-connected system according to claim 1, further comprising a cabinet, wherein the DC-DC converter and the evaporator are disposed in the cabinet.
10. The liquid-cooled photovoltaic high-voltage direct-current series grid-connected system according to claim 1, wherein the condenser is cooled by circulating cooling water or circulating cold air.
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| CN201910897841.XA CN110582186B (en) | 2019-09-23 | 2019-09-23 | Liquid cooling type photovoltaic high-voltage direct-current series grid-connected system |
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| CN201910897841.XA CN110582186B (en) | 2019-09-23 | 2019-09-23 | Liquid cooling type photovoltaic high-voltage direct-current series grid-connected system |
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| CN113543595A (en) * | 2021-07-12 | 2021-10-22 | 广东合一新材料研究院有限公司 | Mobile immersion server, workstation and work system |
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