CN113710076B - Flexible direct-current transmission converter valve cooling system - Google Patents
Flexible direct-current transmission converter valve cooling system Download PDFInfo
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- CN113710076B CN113710076B CN202111116058.9A CN202111116058A CN113710076B CN 113710076 B CN113710076 B CN 113710076B CN 202111116058 A CN202111116058 A CN 202111116058A CN 113710076 B CN113710076 B CN 113710076B
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- 238000001816 cooling Methods 0.000 title claims abstract description 72
- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 238000009825 accumulation Methods 0.000 claims abstract description 78
- 238000009413 insulation Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000219109 Citrullus Species 0.000 description 1
- 235000012828 Citrullus lanatus var citroides Nutrition 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001613 neoplastic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- H05K7/20945—Thermal management, e.g. inverter temperature control
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
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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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20309—Evaporators
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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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20318—Condensers
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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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
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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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20354—Refrigerating circuit comprising a compressor
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
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- Power Engineering (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention belongs to the technical field of flexible direct current transmission, and discloses a flexible direct current transmission converter valve cooling system which comprises a water cooling main circulation system, a first heat exchanger, a three-way valve, a second heat exchanger, a cold accumulation water tank, a third heat exchanger and a cold accumulation loop circulating water pump; one end of the water-cooling main circulation system is sequentially connected with the first heat exchanger and the first end of the three-way valve, and the second end of the three-way valve is connected with the third end of the three-way valve through the first heat exchange side of the second heat exchanger. The first end of the second heat exchange side of the second heat exchanger is sequentially connected with the cold accumulation loop circulating water pump, the third heat exchanger, the cold accumulation water tank and the second end of the second heat exchange side of the second heat exchanger. The cold accumulation water tank can be cooled and store cold energy at low temperature, auxiliary heat exchange is realized through the cold accumulation water tank by using the three-way valve at high temperature, the first heat exchanger does not need to be subjected to heat exchange design according to local extreme highest temperature, the occupied area and the cost of an external cooling system are reduced, and the heat exchange device is particularly suitable for heat exchange design of a converter valve in a high-temperature drought region.
Description
Technical Field
The invention belongs to the technical field of flexible direct current transmission, and relates to a flexible direct current transmission converter valve cooling system.
Background
The energy resource enrichment of Xinjiang, reserve renewable resources such as abundant wind energy, solar energy, etc., is the best energy system that realizes green low carbon, clean low carbon, safe high-efficient modernization multipotency complementation, in recent years, established large-scale wind power and solar energy power generation base in Xinjiang, used the superhigh voltage direct current transmission technique to carry the electric power resource to the intensive region of energy demand by a long distance to realize the optimal configuration utilization of distributed multipotency resource.
The characteristics of Xinjiang terrains can be summarized by using a ' three-mountain two-pot ', the climate type belongs to temperate continental climate, the difference in temperature between day and night is large, the Hangzhou ' early-through fur jacket noon yarn-through ', the surrounding of a stove for eating watermelons ' are good examples, the difference in temperature between day and night is large, and meanwhile, the local maximum temperature in summer exceeds 40 ℃, and the annual precipitation is rare and concentrated. The key equipment converter valve generates a large amount of heat in the ultra-high voltage direct current transmission operation process, the heat of the converter valve is taken away through the flow of a closed internal circulation cooling medium, and the heat is discharged to the atmosphere through air cooling or evaporative cooling.
The heat exchange of the existing direct-current transmission converter valve cooling system mainly comprises two modes, namely an air heat exchanger and a closed cooling tower. The air heat exchanger takes away heat by adopting an external fan, the higher the ambient temperature is, the lower the efficiency is, the higher the outlet water temperature is than 7 ℃ higher than the ambient temperature, and the inlet valve temperature is difficult to meet the heat dissipation requirement of the converter valve after the air high temperature exceeds 40 ℃. The closed cooling tower uses cooling water with a cold spray pump as a heat transfer medium, is not influenced by the temperature of an air dry bulb, has high heat exchange efficiency, but has extremely large water consumption, needs to establish an underground spray water tank and a stable water supply system, is not suitable for high-temperature arid areas, is also provided with a composite cooling system which is used by combining an air heat exchanger and a cooling tower in the current engineering, has a plurality of converter stations which reach the limit temperature, has relatively short annual accumulated time within the range of 5 ℃ and has the highest environment temperature and the maximum heat loss of a converter valve, the cooling system is required to be designed to be operated at full load only in the midday high-temperature time period in summer, and most of heat exchange devices in idle states in other low-temperature time periods, so that large waste is caused, and the problem of large water consumption in the operation process of the converter valve is still not solved, so that the novel cooling system which can meet high temperature and no water consumption is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a flexible direct-current transmission converter valve cooling system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
A flexible direct-current transmission converter valve cooling system comprises a water-cooling main circulation system, a first heat exchanger, a three-way valve, a second heat exchanger, a cold accumulation water tank, a third heat exchanger and a cold accumulation loop circulating water pump; one end of the water cooling main circulation system is sequentially connected with the first heat exchanger and the first end of the three-way valve, the second end of the three-way valve is connected with the third end of the three-way valve through the first heat exchange side of the second heat exchanger, and the first end of the second heat exchange side of the second heat exchanger is sequentially connected with the cold accumulation loop circulating water pump, the third heat exchanger, the cold accumulation water pool and the second end of the second heat exchange side of the second heat exchanger.
The invention is further improved in that:
The first heat exchanger and the third heat exchanger are both water-air heat exchangers.
The second heat exchanger is a plate heat exchanger, and the three-way valve is an electric three-way valve.
The system also comprises a chilled water circulating water pump, an evaporator, a compressor, a condenser and an expansion valve; the first side of the evaporator is communicated with the cold accumulation water pool through the chilled water circulating water pump, and the first end of the second side of the evaporator is sequentially connected with the compressor, the condenser, the expansion valve and the second end of the second side of the evaporator.
A low-pressure controller is arranged on a pipeline between the evaporator and the compressor, and a high-pressure controller is arranged on a pipeline between the condenser and the expansion valve.
The cold accumulation water pool is built below the ground surface.
And the peripheral wall surfaces of the cold accumulation water tank are provided with heat insulation layers made of heat insulation materials.
And the cold accumulation pool is provided with an interface for reserving the cold accumulation pool to a valve hall cooling system.
And the cold accumulation pond is provided with a cold accumulation pond reserved to a warm ventilation interface of the converter station.
And a heater is arranged in the cold accumulation water tank.
Compared with the prior art, the invention has the following beneficial effects:
According to the flexible direct-current transmission converter valve cooling system, a main cooling circulation loop is formed by arranging the water cooling main circulation system, the first heat exchanger and the three-way valve, the second heat exchanger, the cold accumulation water tank, the third heat exchanger and the cold accumulation loop circulating water pump are arranged to form the cold accumulation cooling loop, the characteristic of large temperature difference at different time periods can be utilized, cold accumulation water tank cooling and cold accumulation can be realized at low temperature, auxiliary heat exchange is realized through the cold accumulation water tank at high temperature period by utilizing the three-way valve, and the heat dissipation problem of the flexible direct-current transmission converter valve at overhigh temperature can be solved. The heat exchange design of the first heat exchanger is not needed according to the local extreme highest temperature, the occupied area and the cost of an external cooling system are reduced, and the heat exchange design of the converter valve is particularly suitable for high-temperature arid regions and has obvious technical advantages.
Drawings
Fig. 1 is a schematic structural diagram of a cooling system of a flexible direct current transmission converter valve of the invention.
Wherein: 1-a converter valve; 2-a water-cooling main circulation system; 3-a first heat exchanger; 4-three-way valve; 5-a cold accumulation water tank; 6-a heat insulation layer; 7-a chilled water circulating water pump; 8-retaining the cold accumulation pool to a valve hall cooling system interface; 9-a second heat exchanger; 10-a third heat exchanger; 11-a cold accumulation loop circulating water pump; 12-an evaporator; 13-a low pressure controller; 14-a compressor; 15-a condenser; 16-a high voltage controller; 17-an expansion valve; 18-a heater; and the 19-cold accumulation pool is reserved to a warm ventilation interface of the converter station.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, the invention provides a flexible direct-current transmission converter valve cooling system, which comprises a main cooling circulation loop and a cold accumulation cooling loop, wherein the main cooling circulation loop comprises a water cooling main circulation system 2, a first heat exchanger 3 and a three-way valve 4, and the cold accumulation cooling loop comprises a second heat exchanger 9, a cold accumulation water tank 5, a third heat exchanger 10 and a cold accumulation loop circulating water pump 11.
One end of the water-cooling main circulation system 2 is sequentially connected with the first heat exchanger 3 and the first end of the three-way valve 4, and the second end of the three-way valve 4 is connected with the third end of the three-way valve 4 through the first heat exchange side of the second heat exchanger 9. The first end of the second heat exchange side of the second heat exchanger 9 is sequentially connected with the cold accumulation loop circulating water pump 11, the third heat exchanger 10, the cold accumulation water tank 5 and the second end of the second heat exchange side of the second heat exchanger 9.
When the cooling system is used, one end of the water-cooling main circulation system 2 far away from the first heat exchanger 3 and the third end of the three-way valve 4 are respectively connected with two ends of the flexible direct-current transmission converter valve to form a cooling loop.
The water-cooling main circulation system 2 provides stable flow circulation for the main cooling circulation loop, but is a circulating water pump and other components. The first heat exchanger 3 and the third heat exchanger 10 are both water-air heat exchangers, and the water-air heat exchangers are adopted for heat dissipation according to the use environment with large temperature difference in daytime and evening and low average air temperature, so that a large amount of cooling water loss is avoided. The second heat exchanger 9 is a plate heat exchanger, which is a high-efficiency heat exchanger formed by stacking a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between the various plates through which heat is exchanged. The plate heat exchanger is ideal equipment for liquid-liquid and liquid-vapor heat exchange. The heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, wide application, long service life and the like. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, the occupied area is one third of that of the tubular heat exchanger, and the heat recovery rate can be up to more than 90%. The plate type heat exchanger has two main types, namely a frame type (detachable type) and a brazing type, and the plate type has three types, namely a herringbone corrugated plate, a horizontal flat corrugated plate and a neoplastic plate. The three-way valve 4 is an electric three-way valve, so that automatic control is convenient to realize.
In summary, the flexible direct-current transmission converter valve cooling system is provided with the main cooling circulation loop and the cold accumulation cooling loop, wherein the main cooling circulation loop comprises the water cooling main circulation system 2, the first heat exchanger 3 and the three-way valve 4, and the cold accumulation cooling loop comprises the second heat exchanger 9, the cold accumulation water tank 5, the third heat exchanger 10 and the cold accumulation loop circulating water pump 11. The characteristic that the temperature difference is large in different periods is utilized, the cold accumulation water tank 5 can be cooled and cold energy can be stored at low temperature, auxiliary heat exchange is realized through the cold accumulation water tank 5 in a high-temperature period through the three-way valve 4, and the heat dissipation problem of the flexible direct-current transmission converter valve when the temperature is too high can be solved. The heat exchange design of the first heat exchanger is not needed according to the local extreme highest temperature, the occupied area and the cost of an external cooling system are reduced, and the heat exchange design of the flexible direct current transmission converter valve is particularly suitable for high-temperature arid regions and has obvious technical advantages.
Preferably, the cold accumulation auxiliary cooling circuit is further included, and the cold accumulation auxiliary cooling circuit comprises a chilled water circulating water pump 7, an evaporator 12, a compressor 14, a condenser 15 and an expansion valve 17. The first side of the evaporator 12 is communicated with the cold accumulation water tank 5 through the chilled water circulating water pump 7, and the first end of the second side of the evaporator 12 is sequentially connected with the compressor 14, the condenser 15, the expansion valve 17 and the second end of the second side of the evaporator 12. The cold accumulation auxiliary cooling loop provides low-temperature chilled water for the cold accumulation water tank 5 through a compressor 14, a condenser 15, an expansion valve 17, an evaporator 12 and a chilled water circulating water pump 11. The compressor 14 on the cold storage auxiliary cooling circuit provides the compensating cooling water to the cold storage water reservoir 5 when extreme high temperature weather occurs.
The compressor 14 is a driven fluid machine that lifts low-pressure gas to high-pressure gas, and is the heart of a refrigeration system. The low-temperature low-pressure refrigerant gas is sucked from the air suction pipe, the motor is operated to drive the piston to compress the low-temperature low-pressure refrigerant gas, and then the high-temperature high-pressure refrigerant gas is discharged to the air discharge pipe to provide power for refrigeration cycle. The condenser 15 is a component of the refrigeration system, which is a type of heat exchanger, capable of converting a gas or vapor into a liquid, and transferring the heat from the tube to the air in the vicinity of the tube in a rapid manner. The operation of the condenser 15 is exothermic, so that the temperature of the condenser 15 is high. The expansion valve 17 is an important component in the refrigeration system. The expansion valve 17 throttles the medium-temperature high-pressure liquid refrigerant to low-temperature low-pressure wet vapor therethrough, and the refrigerant absorbs heat in the evaporator 12 to achieve a refrigerating effect.
Preferably, a low pressure controller 13 is provided in the line between the evaporator 12 and the compressor 14, and a high pressure controller 16 is provided in the line between the condenser 15 and the expansion valve 17. The low-voltage controller 13 is mainly used for controlling the low-voltage pressure or the suction pressure of the system, and when the low voltage is too low, the low-voltage controller 13 can jump to disconnect the circuit of the contactor, so that the system can not operate under the too low pressure, and the operating economy of the system is improved. The high pressure controller 16 functions to control the high pressure of the system or the exhaust pressure. When the high pressure exceeds the set value of the high pressure controller 16, the high pressure controller 16 trips to open the circuit, functioning as a protection system.
Preferably, the cold accumulation water tank 5 is built below the ground surface, so as to avoid the surface solar irradiation temperature rise, and the wall surface is subjected to heat insulation treatment, namely, the wall surface around the cold accumulation water tank 5 is provided with a heat insulation layer 6 made of heat insulation materials.
Preferably, the cold accumulation pool 5 is provided with a cold accumulation pool reserved to the valve hall cooling system interface 8, and the cold accumulation pool reserved to the valve hall cooling system interface 8 can be connected with chilled water sources such as air conditioning refrigeration of a converter valve hall.
Preferably, the cold accumulation pond 5 is provided with a cold accumulation pond reserved to the converter station heating and ventilation interface 19, so that hot water for heating the converter station can be connected, heat can be comprehensively utilized, and the cold accumulation pond can be connected to a converter station heating and ventilation system for heating.
Preferably, the cold-storage water tank 5 is internally provided with a heater 18 to prevent the cold-storage water tank 5 from freezing at extremely low temperatures.
The working process of the flexible direct-current transmission converter valve cooling system comprises the following steps:
Under normal conditions, the cooling of the flexible direct-current transmission converter valve is realized through the first heat exchanger 3 in the main cooling circulation loop, and meanwhile, the cooling water is cooled through the cold accumulation cooling loop. The cold accumulation auxiliary cooling loop is only put into cold accumulation in extremely high temperature weather. For example, in this embodiment, the first heat exchanger 3 of the main cooling circulation loop provides heat dissipation by the flexible dc power transmission converter valve at an ambient temperature below 35 ℃, and when the ambient temperature exceeds 35 ℃ during daytime, the first heat exchanger 3 cannot meet the heat dissipation requirement, a part of flow is distributed to the second heat exchanger 9 of the cold storage cooling loop through the three-way valve 4, and auxiliary heat exchange is performed through the low-temperature cooling water in the cold storage water tank 5.
Meanwhile, the cold accumulation cooling loop and the cold accumulation auxiliary cooling loop work at night when the air temperature is low. Firstly, the minimum cold storage temperature and the minimum cold storage volume of the cooling water in the cold storage water tank 5 are determined and the margin is reserved by calculating based on the duration time, the maximum temperature, the heat exchange amount and other parameters of the daytime high-temperature period. In the operation process, the ambient temperature and the real-time temperature in the cold accumulation water tank 5 are acquired through the sensors, and the water-air heat exchanger 10 is preferentially cooled and accumulated in cold accumulation at night because the heat exchange efficiency of the water-air heat exchanger is higher when the air temperature is low than when the air temperature is high, so that the high-temperature water in the cold accumulation water tank is reduced due to the high-temperature period and the heat exchange of the converter valve in daytime. On the basis, the condenser 15 and the compressor 14 are controlled to realize the supplementary cooling and cold accumulation, and the supplementary cold accumulation is required to reach the required temperature when the temperature in the cold accumulation water tank 5 is required. By utilizing the characteristic of large temperature difference at night and day, the cold accumulation water tank 5 is cooled and stores cold energy at night, and auxiliary heat exchange is performed through the cold energy stored in the cold accumulation water tank 5 in the day high-temperature period.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (4)
1. The flexible direct-current transmission converter valve cooling system is characterized by comprising a water-cooling main circulation system (2), a first heat exchanger (3), a three-way valve (4), a second heat exchanger (9), a cold accumulation water tank (5), a third heat exchanger (10) and a cold accumulation loop circulating water pump (11); one end of the water cooling main circulation system (2) is sequentially connected with the first heat exchanger (3) and the first end of the three-way valve (4), the second end of the three-way valve (4) is connected with the third end of the three-way valve (4) through the first heat exchange side of the second heat exchanger (9), and the first end of the second heat exchange side of the second heat exchanger (9) is sequentially connected with the cold accumulation loop circulating water pump (11), the third heat exchanger (10), the cold accumulation pool (5) and the second end of the second heat exchange side of the second heat exchanger (9);
the system also comprises a chilled water circulating water pump (7), an evaporator (12), a compressor (14), a condenser (15) and an expansion valve (17); the first side of the evaporator (12) is communicated with the cold accumulation water tank (5) through the chilled water circulating water pump (7), and the first end of the second side of the evaporator (12) is sequentially connected with the compressor (14), the condenser (15), the expansion valve (17) and the second end of the second side of the evaporator (12);
A low-pressure controller (13) is arranged on a pipeline between the evaporator (12) and the compressor (14), and a high-pressure controller (16) is arranged on a pipeline between the condenser (15) and the expansion valve (17);
the cold accumulation water tank (5) is built below the ground surface;
The heat insulation layer (6) made of heat insulation materials is arranged on the peripheral wall surface of the cold accumulation water tank (5);
the cold accumulation pool (5) is provided with a cold accumulation pool reserved to a valve hall cooling system interface (8);
the cold accumulation pool (5) is provided with a cold accumulation pool reserved to a warm ventilation port (19) of the converter station.
2. The flexible direct current transmission converter valve cooling system according to claim 1, characterized in that the first heat exchanger (3) and the third heat exchanger (10) are both water-wind heat exchangers.
3. A flexible direct current transmission converter valve cooling system according to claim 1, characterized in that the second heat exchanger (9) is a plate heat exchanger and the three-way valve (4) is an electric three-way valve.
4. The flexible direct current transmission converter valve cooling system according to claim 1, wherein a heater (18) is arranged in the cold accumulation water tank (5).
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| CN202111116058.9A CN113710076B (en) | 2021-09-23 | 2021-09-23 | Flexible direct-current transmission converter valve cooling system |
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| CN202111116058.9A CN113710076B (en) | 2021-09-23 | 2021-09-23 | Flexible direct-current transmission converter valve cooling system |
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| CN113710076A CN113710076A (en) | 2021-11-26 |
| CN113710076B true CN113710076B (en) | 2024-06-14 |
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