CN113710076A - Flexible direct current transmission converter valve cooling system - Google Patents
Flexible direct current transmission converter valve cooling system Download PDFInfo
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- CN113710076A CN113710076A CN202111116058.9A CN202111116058A CN113710076A CN 113710076 A CN113710076 A CN 113710076A CN 202111116058 A CN202111116058 A CN 202111116058A CN 113710076 A CN113710076 A CN 113710076A
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- 238000001816 cooling Methods 0.000 title claims abstract description 76
- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000009825 accumulation Methods 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims description 6
- 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 3
- 238000000034 method Methods 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 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
- 206010028980 Neoplasm Diseases 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
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000002184 metal 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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Abstract
The invention belongs to the technical field of flexible direct current power transmission, and discloses a cooling system of a flexible direct current power transmission converter valve, 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 circulation water pump; and 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 pool and the second end of the second heat exchange side of the second heat exchanger. The cold storage water tank can be cooled and cold storage can be carried out at low temperature, the three-way valve is utilized to realize auxiliary heat exchange through the cold storage water tank at a high temperature period, the first heat exchanger does not need to be designed to exchange heat according to the 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 the heat exchange design of the converter valve in a high-temperature arid region.
Description
Technical Field
The invention belongs to the technical field of flexible direct current power transmission, and relates to a cooling system of a converter valve for flexible direct current power transmission.
Background
The energy resource enrichment of Xinjiang, which contains abundant renewable resources such as wind energy, solar energy and the like, is an optimal energy system for realizing green, low-carbon, clean, low-carbon, safe and efficient modernization multi-energy complementation, in recent years, a large-scale wind power and solar power generation base is established in Xinjiang, and the electric power resource is remotely transmitted to an energy demand dense area by using an ultrahigh voltage direct current transmission technology, so that the optimal configuration and utilization of distributed multi-energy resources are realized.
Xinjiang topography feature can be generalized by "two basins are sandwiched in three mountains", the climate type belongs to temperate continental climate, the temperature difference between day and night is large, the adage "wear leather-padded jacket at noon and wear the yarn early, surround the stove and eat the watermelon" is a good example, the temperature difference between day and night is large, simultaneously the local maximum temperature in summer exceeds 40 ℃, and the annual precipitation is rare and concentrated. The converter valve of key equipment generates a large amount of heat in the running process of ultrahigh-voltage direct-current power transmission, the heat of the converter valve is taken away through the flowing 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 adopts two modes of 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 outlet water temperature is generally higher than the ambient temperature by more than 7 ℃, and the temperature of the inlet valve after the air temperature exceeds 40 ℃ is difficult to meet the heat dissipation requirement of the converter valve. The closed cooling tower takes the cooling water of the external cold spray pump as a heat transfer medium, is not influenced by the temperature of the air dry bulb, has high heat exchange efficiency, however, the water consumption is very high, an underground spray water tank and a stable water supply system need to be established, both heat exchange modes are not suitable for high-temperature arid regions, a composite cooling system combining an air heat exchanger and a cooling tower is also adopted in the current engineering, the annual accumulated time of a plurality of converter stations reaching the limit temperature within 5 ℃ is short, the cooling system needs to be designed according to the highest environmental temperature and the maximum heat loss of a converter valve and only runs at full load in the daytime and noon high-temperature time in summer, other heat exchange devices in a large part in a low-temperature time period are in an idle state, so that great waste is caused, the problem of great water consumption in the operation process of the converter valve can not be solved, and a novel cooling system which can meet high temperature and has no water consumption is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cooling system for a flexible direct current transmission converter valve.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a cooling system of a flexible direct-current power transmission converter valve comprises a water-cooling main circulation system, a first heat exchanger, a three-way valve, a second heat exchanger, a cold accumulation water pool, a third heat exchanger and a cold accumulation loop circulation 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 second end of the cold accumulation loop circulation water pump, the third heat exchanger, the cold accumulation water pool and the second heat exchange side of the second heat exchanger.
The invention further improves the following steps:
and 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 tank through a 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.
And 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 tank 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 a cold storage pool reserved to a valve hall cooling system interface is arranged on the cold storage pool.
And the cold storage pool is arranged on the cold storage pool and reserved to the warm ventilation interface of the converter station.
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 cooling system for the flexible direct-current power transmission converter valve, the main cooling circulation loop is formed by arranging the water cooling main circulation system, the first heat exchanger and the three-way valve, the cold accumulation cooling loop is formed by arranging the second heat exchanger, the cold accumulation water tank, the third heat exchanger and the cold accumulation loop circulation water pump, the characteristic of large temperature difference in different time intervals can be utilized, the cold accumulation water tank can be cooled and stored with cold energy at low temperature, the three-way valve is utilized to realize auxiliary heat exchange through the cold accumulation water tank in high temperature time intervals, and the heat dissipation problem of the flexible direct-current power transmission converter valve when the temperature is too high can be solved. The heat exchanger does not need to consume a large amount of cooling water, the first heat exchanger does not need to be designed for heat exchange according to the local extreme maximum temperature, the occupied area and the cost of an external cooling system are reduced, the heat exchanger is particularly suitable for the heat exchange design of the converter valve in a high-temperature arid region, and the heat exchanger 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-water cooling of the main circulation system; 3-a first heat exchanger; 4-three-way valves; 5-cold storage water pool; 6-a heat insulation layer; 7-chilled water circulating water pump; 8, reserving a cold storage pool to a valve hall cooling system interface; 9-a second heat exchanger; 10-a third heat exchanger; 11-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 19, reserving the cold storage pool to a heating and ventilation interface of the converter station.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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 accompanying drawings:
referring to fig. 1, the invention provides a cooling system for a flexible direct-current power transmission converter valve, 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 circulation 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 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 in sequence.
When the flexible direct-current transmission converter valve is used, one end of the water-cooling main circulation system 2, which is 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, and can be a circulating water pump and other components. First heat exchanger 3 and third heat exchanger 10 are water wind heat exchanger, and to daytime evening the difference in temperature big, the low service environment of average temperature, adopt water wind heat exchanger to dispel the heat, do not have a large amount of cooling water losses. 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 certain corrugated shapes. Thin rectangular channels are formed between the various plates through which heat is exchanged. The plate heat exchanger is an ideal device for heat exchange of liquid-liquid and liquid-vapor. 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 condition of the same pressure loss, the heat transfer coefficient of the heat exchanger is 3-5 times higher than that of the tubular heat exchanger, the occupied area of the heat exchanger is one third of that of the tubular heat exchanger, and the heat recovery rate can reach more than 90 percent. The plate type heat exchanger mainly comprises two types of frames (detachable type) and brazing type, and the plate type mainly comprises a herringbone corrugated plate, a horizontal straight corrugated plate and a tumor-shaped 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 of the invention 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 circulation water pump 11. The characteristic that the temperature difference is large in different time periods is utilized, the cold storage water pool 5 can be cooled and the cold quantity can be stored at low temperature, the cold storage water pool 5 can be used for assisting heat exchange in a high-temperature time period through the three-way valve 4, and the heat dissipation problem of the flexible direct-current power 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 maximum temperature, the occupied area and the cost of an external cooling system are reduced, the heat exchange design is particularly suitable for the heat exchange design of the flexible direct-current power transmission converter valve in a high-temperature arid region, and the heat exchange design has obvious technical advantages.
Preferably, a cold storage auxiliary cooling loop is further included, and the cold storage auxiliary cooling loop 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 storage 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. When extreme high temperature weather occurs, the compressor 14 on the cold accumulation auxiliary cooling loop provides compensation cooling water to the cold accumulation water tank 5.
The compressor 14 is a driven fluid machine that raises low-pressure gas into high-pressure gas, and is a heart of the refrigeration system. The refrigerating cycle is powered by sucking low-temperature and low-pressure refrigerant gas from the air suction pipe, driving the piston to compress the refrigerant gas through the operation of the motor, and discharging high-temperature and high-pressure refrigerant gas to the exhaust pipe. The condenser 15 is a component of a refrigeration system, and is one type of heat exchanger that converts a gas or vapor into a liquid and transfers the heat in the tubes to the air in the vicinity of the tubes in a rapid manner. The operation of the condenser 15 is exothermic, so the temperature of the condenser 15 is high. The expansion valve 17 is an important component in a refrigeration system. The expansion valve 17 throttles the medium-temperature high-pressure liquid refrigerant into low-temperature low-pressure wet vapor, and the refrigerant absorbs heat in the evaporator 12 to achieve a refrigeration effect.
Preferably, a low pressure controller 13 is provided in a line between the evaporator 12 and the compressor 14, and a high pressure controller 16 is provided in a 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 cannot run under the too low pressure, and the running economy of the system is improved. The high pressure controller 16 functions to control the high pressure or exhaust pressure of the system. When the high pressure exceeds the set value of the high pressure controller 16, the high pressure controller 16 trips, opening the circuit and acting as a protection system.
Preferably, the cold storage water tank 5 is built below the ground surface to avoid the temperature rise of the surface layer due to solar irradiation, and the wall surface is subjected to heat insulation treatment, namely, the heat insulation layers 6 made of heat insulation materials are arranged on the peripheral wall surfaces of the cold storage water tank 5.
Preferably, the cold storage pool 5 is provided with a cold storage pool reserved to a valve hall cooling system interface 8, and the cold storage pool reserved to the valve hall cooling system interface 8 can be accessed to chilled water sources such as air conditioning refrigeration of a converter valve hall.
Preferably, the cold storage pool 5 is provided with a cold storage pool reserved to the converter station heating and ventilation interface 19, can be accessed to hot water for heating of the converter station, comprehensively utilizes heat, and can also be connected to a converter station heating and ventilation system to provide heating.
Preferably, a heater 18 is arranged in the cold storage water tank 5 to prevent the cold storage water tank 5 from freezing at an extremely low temperature.
The working process of the cooling system of the flexible direct current transmission converter valve comprises the following steps:
normally, 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 extreme high-temperature weather. For example, in the embodiment, the first heat exchanger 3 of the main cooling circulation loop provides heat dissipation of the flexible direct-current transmission converter valve when the ambient temperature is below 35 ℃, and when the ambient temperature exceeds 35 ℃ in the daytime and the first heat exchanger 3 cannot meet the heat dissipation requirement, part of the flow is distributed to the second heat exchanger 9 of the cold accumulation cooling loop through the three-way valve 4, and auxiliary heat exchange is performed through low-temperature cooling water in the cold accumulation 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 calculation is carried out based on the parameters such as duration, highest temperature and heat exchange amount of the high-temperature period in the daytime, and then the cold accumulation lowest temperature and volume of the cooling water in the cold accumulation water tank 5 are determined and the margin is reserved. In the operation process, the ambient temperature and the real-time temperature in the cold accumulation water tank 5 are collected through the sensor, and the heat exchange efficiency of the water-air heat exchanger when the air temperature is low is higher than that of the water-air heat exchanger when the air temperature is high, so that the water-air heat exchanger 10 is preferentially cooled and accumulated during cold accumulation at night, and the high-temperature water in the cold accumulation water tank due to high-temperature time intervals and heat exchange of the converter valve in the daytime is reduced. On the basis, the supplementary cooling cold accumulation is realized by controlling the condenser 15 and the compressor 14, and the temperature in the cold accumulation water tank 5 is required to be supplemented with the cold accumulation to the required temperature. Utilize daytime the great characteristics of difference in temperature night, cool down and the cold volume of storage for cold-storage pond 5 night, in daytime the high temperature period, carry out supplementary heat transfer through the cold volume of storage in cold-storage pond 5.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A cooling system of a flexible direct-current power transmission converter valve 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 circulation water pump (11); one end of the water-cooling main circulation system (2) is sequentially connected with the first ends of the first heat exchanger (3) and 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 second end of the second heat exchange side of the cold accumulation loop circulation water pump (11), the third heat exchanger (10), the cold accumulation water tank (5) and the second heat exchanger (9).
2. The cooling system for the converter valve for flexible direct current transmission 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. The flexible direct current transmission converter valve cooling system according to claim 1, wherein the second heat exchanger (9) is a plate heat exchanger and the three-way valve (4) is an electric three-way valve.
4. The cooling system for the flexible direct current transmission converter valve according to claim 1, further comprising a chilled water circulating 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 storage water tank (5) through a 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).
5. The HVDC converter valve cooling system according to claim 4, wherein 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).
6. The flexible direct current transmission converter valve cooling system according to claim 1, wherein the cold accumulation water tank (5) is built below ground surface.
7. The cooling system for the converter valve with flexible direct current power transmission according to claim 1, wherein a heat insulation layer (6) made of heat insulation materials is arranged on the peripheral wall surface of the cold storage water tank (5).
8. The flexible direct current transmission converter valve cooling system according to claim 1, wherein a cold storage pool reserved to a valve hall cooling system interface (8) is arranged on the cold storage pool (5).
9. The cooling system for the converter valve with flexible direct current transmission according to claim 1, characterized in that a cold storage pool is arranged on the cold storage pool (5) and reserved on a converter station heating and ventilation interface (19).
10. The cooling system for a converter valve with flexible direct current transmission according to claim 1, characterized in that a heater (18) is arranged in the cold storage water pool (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111116058.9A CN113710076B (en) | 2021-09-23 | 2021-09-23 | Flexible direct-current transmission converter valve cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111116058.9A CN113710076B (en) | 2021-09-23 | 2021-09-23 | Flexible direct-current transmission converter valve cooling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113710076A true CN113710076A (en) | 2021-11-26 |
| CN113710076B CN113710076B (en) | 2024-06-14 |
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| CN202111116058.9A Active CN113710076B (en) | 2021-09-23 | 2021-09-23 | Flexible direct-current transmission converter valve cooling system |
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