CN114111171A - Converter station cooling system and control method thereof - Google Patents

Converter station cooling system and control method thereof Download PDF

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Publication number
CN114111171A
CN114111171A CN202111338904.1A CN202111338904A CN114111171A CN 114111171 A CN114111171 A CN 114111171A CN 202111338904 A CN202111338904 A CN 202111338904A CN 114111171 A CN114111171 A CN 114111171A
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China
Prior art keywords
liquid level
converter station
cold water
water pump
external cold
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CN202111338904.1A
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CN114111171B (en
Inventor
梅琦龙
吕涛
毕伟
孙豪
何照能
徐根堂
陈迁
张萌
刘越
李少森
袁虎强
任君
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Kunming Bureau of Extra High Voltage Power Transmission Co
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Kunming Bureau of Extra High Voltage Power Transmission Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The application relates to a converter station cooling system and a control method thereof. The cooling system of the converter station comprises an external cold water source and a water pump module, wherein the external cold water source is used for cooling internal cold water of the converter station, the water pump module is used for supplementing cooling water to the external cold water source, and the control method of the cooling system of the converter station comprises the following steps: acquiring direct current power of a converter station and liquid level of an external cold water source; determining a target control liquid level according to the direct current power; and if the liquid level of the external cold water source is lower than the target control liquid level, controlling the water pump module to work so that the liquid level of the external cold water source is the same as the target control liquid level. The control method of the converter station cooling system improves the control precision and efficiency of the converter station cooling system on the liquid level of the external cold water source and prolongs the service life of the water pump module.

Description

Converter station cooling system and control method thereof
Technical Field
The application relates to the technical field of direct current transmission, in particular to a converter station cooling system and a control method thereof.
Background
During the operation of the ultra-high voltage direct current transmission system, a large amount of loss can be generated in the direct current transmission line and the converter station, and the loss is mainly radiated outwards in the form of heat energy. The direct-current transmission line is arranged outdoors, so that heat dissipation is fast; and equipment in the converter station is compactly arranged, and heat generated by power loss is easy to accumulate in large quantity, so that the temperature of primary equipment is rapidly increased, and the equipment is finally burnt, particularly a converter valve tower. Thus, a valve cooling system is arranged within the converter station for the converter valve tower.
The valve cooling system of the conventional direct current transmission system mainly comprises an inner water cooling system and an outer water cooling system. The inner cold water system is a closed water circulation system and does not need to exchange water with the outside. The external cold water system is an open water circulation system, needs to exchange water with an external cold water source constantly, and ensures that the water level, the water pressure and the water quality of the external cold water source meet requirements. The problem of inefficiency and poor precision exist in the regulation of external cold water source's liquid level among the conventional art.
Disclosure of Invention
In view of the above, it is necessary to provide a converter station cooling system and a control method thereof, which can automatically and precisely control the liquid level of an external cold water source.
On one hand, the embodiment of the invention provides a control method of a converter station cooling system, the converter station cooling system comprises an external cold water source and a water pump module, the external cold water source is used for cooling internal cold water of a converter station, the water pump module is used for supplementing cooling water to the external cold water source, and the control method of the converter station cooling system comprises the following steps: acquiring direct current power of a converter station and liquid level of an external cold water source; determining a target control liquid level according to the direct current power; and if the liquid level of the external cold water source is lower than the target control liquid level, controlling the water pump module to work so that the liquid level of the external cold water source is the same as the target control liquid level.
In one embodiment, the step of determining the target control level based on the dc power comprises: determining a direct-current power range to which the direct-current power belongs from a plurality of direct-current power ranges; each direct current power range corresponds to a control liquid level; and taking the control liquid level corresponding to the direct current power range as a target control liquid level.
In one embodiment, the plurality of DC power ranges is R1，R2...RNIn any DC power range RaIs greater than another DC power range RbIn the case of the upper limit value of (3), the power range RaCorresponding control level HaGreater than the power range RbCorresponding control level Hb。
In one embodiment, the step of determining the target control level based on the dc power comprises: determining a control liquid level corresponding to the direct current power from the direct current power-control liquid level curve according to the direct current power; the direct current power-control liquid level curve is used for reflecting the one-to-one corresponding relation between the direct current power and the control liquid level; and taking the control liquid level corresponding to the direct current power as a target control liquid level.
A converter station cooling system comprising: the external cold water source is used for cooling internal cold water of the converter station; the water pump module is used for supplementing cooling water to an external cold water source; the control host is connected with the converter station and the water pump module and comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize the steps of the control method of the cooling system of the converter station.
In one embodiment, the water pump module comprises: a water pump; the first internet of things communication unit 37 is used for establishing communication connection with the control host through the internet of things and receiving a water pump control command sent by the control host; the water pump control command is used for indicating the water pump to work so that the liquid level of the external cold water source is the same as the target control liquid level; the first data processing unit 35 is connected with the first internet of things communication unit 37 and used for analyzing the water pump control command according to a preset internet of things communication protocol; and the driving unit is connected with the first data processing unit 35 and is used for driving the water pump according to the analyzed water pump control command.
In one embodiment, the water pump module further comprises an air switch unit, and the air switch unit is used for disconnecting a power supply loop of the water pump under the condition that the water pump has a short-circuit fault.
In one embodiment, the water pump module further includes a first power supply module, where the first power supply module includes a first power supply unit, a first solar charging unit, and a first energy storage unit; the first solar charging unit is used for charging the first energy storage unit by using solar energy; the first power supply unit is used for transmitting the electric energy provided by the first energy storage unit or the external power supply to the water pump, the first internet of things communication unit 37, the first data processing unit 35 and the driving unit.
In one embodiment, the converter station cooling system further comprises a level sensor module 90, the level sensor comprising: the liquid level probe is used for acquiring the liquid level of an external cold water source; the second data processing unit is connected with the liquid level probe and is used for performing voltage transformation processing, filtering processing and analog-to-digital conversion processing on the liquid level of the external cold water source fed back by the liquid level probe and processing the liquid level according to a preset Internet of things communication protocol; and the second internet of things communication unit is connected with the second data processing unit and used for establishing communication connection with the control host through the internet of things and sending the liquid level of the external cold water source processed by the second data processing unit to the control host after being processed according to a preset internet of things communication protocol.
In one embodiment, the level probe comprises a plurality of different types of level probes; the second data processing unit is used for performing voltage transformation processing, filtering processing and analog-to-digital conversion processing on the liquid level of the external cold water source and processing according to a preset Internet of things communication protocol under the condition that the deviation between the liquid levels of the external cold water sources fed back by the liquid level probes is smaller than a preset value.
Based on any one of the above embodiments, the target control liquid level of the external cold water source is set according to the direct-current power of the converter station, so that the liquid level of the external cold water source is adaptively adjusted according to the heating condition of the converter station, sufficient cooling water is ensured to be in the external cold water source, the problem of frequent start and stop of the water pump module is avoided, the control precision and efficiency of the converter station cooling system on the liquid level of the external cold water source are improved, and the service life of the water pump module is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram illustrating a method for controlling a cooling system of a converter station according to one embodiment;
FIG. 2 is a schematic flow diagram of determining a target control level in one embodiment;
FIG. 3 is a schematic flow chart of another embodiment for determining a target control level;
FIG. 4 is a schematic diagram of the configuration of the cooling system of the converter station in one embodiment;
FIG. 5 is a schematic diagram of an embodiment of a water pump module;
FIG. 6 is a schematic diagram of a cooling system of a converter station according to another embodiment;
FIG. 7 is a schematic diagram of a liquid level sensor module according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
The inventor researches and finds that the problems of low efficiency and poor precision exist in the liquid level control of the external cold water source of the converter station cooling system mentioned in the background art, and the problems are caused by the following reasons: a common mode in the traditional technology is that a specially-assigned person is dispatched to a pump room of a water source outside a station for duty, a patrol worker regularly checks the water level of a spray water tank in the station, the pump room duty worker is informed to manually open a valve to inject water into the spray water tank when the water level is low, and the pump room duty worker is informed to manually close a water pump when the water level is high. This kind of mode cost of labor is higher, can't adjust the water pump in pump house outside the station in real time according to the water condition in the station, can't satisfy accurate, quick adjustment's demand. The other mode is that the water pump control system in the converter station collects the liquid level of an external cold water source through a liquid level sensor, and the water pump in the pump room outside the station is started up according to the height of the liquid level to replenish water to the spray water tank. However, the target control liquid level is fixed in this way, and cannot be adjusted in a self-adaptive manner according to the actual working condition of the converter station, so that frequent starting and stopping of the water pump are easily caused, the equipment is seriously aged, and serious faults such as locking of the converter station and the like due to untimely water supplement can also occur.
For the above reasons, embodiments of the present invention provide a method for controlling a cooling system of a converter station. The converter station cooling system comprises an external cold water source and a water pump module, wherein the external cold water source is used for cooling internal cold water of the converter station. It can be understood that the inner cooling system of the converter station cools the converter station by continuously taking away heat dissipated by high-temperature equipment in the converter station through circulation of inner cooling water in an inner cooling pipeline, the temperature of the inner cooling water can continuously rise in the operation process, the inner cooling pipeline is cooled through an outer cooling water source, for example, the cooling water in the outer cooling water source is sprayed on the inner cooling pipeline to cool the inner cooling water, and the inner cooling system is ensured to continuously and stably cool the converter station. Because the cooling water in the external cold water source can be consumed gradually, the water pump module extracts from the water replenishing water source and pumps the cooling water to the external cold water source, and the cooling water supplement to the external cold water source is realized. As shown in fig. 1, the method of controlling the cooling system of the converter station comprises steps S102 to S106.
S102, acquiring the direct current power of the converter station and the liquid level of an external cold water source.
It can be understood that there is a device for collecting and monitoring the dc power of the converter station in the original control system of the converter station, so that the dc power of the converter station can be obtained through data communication with the original control system of the converter station, and the dc power of the converter station can also be obtained through separately setting a power sensor. The liquid level of the external cold water source can be detected by various liquid level sensors, for example, liquid level sensors based on the ultrasonic principle, the floating ball principle or the laser principle.
And S104, determining a target control liquid level according to the direct current power.
It is understood that the target control level is a target level value for the external cold water source. The magnitude of the direct current power reflects the heating condition of the converter station, the larger the direct current power transmitted by the converter station is, the more heat is emitted by the converter station during working, so the temperature rising speed of the internal cooling water is higher, and the liquid level in the external cooling water source is higher in order to ensure the heat dissipation effect of the internal cooling system. Therefore, the target control liquid level can be determined according to the direct current power.
And S106, if the liquid level of the external cold water source is lower than the target control liquid level, controlling the water pump module to work so that the liquid level of the external cold water source is the same as the target control liquid level.
Under the condition that the liquid level of the external cold water source is lower than the target control liquid level, water in the external cold water source is required to be supplemented in time, and at the moment, the control water pump module extracts cooling water from the water supplementing water source to supplement the cooling water to the external cold water source until the liquid level of the external cold water source is the same as the target control liquid level. Under the condition that the liquid level of the external cold water source is higher than the target control liquid level, the water pump module does not need to work, and the problem of frequent starting and stopping of the water pump module is solved.
Based on the control method of the cooling system of the converter station in the embodiment, the target control liquid level of the external cold water source is set according to the direct-current power of the converter station, so that the liquid level of the external cold water source is adaptively adjusted according to the heating condition of the converter station, sufficient cooling water is ensured to be in the external cold water source, the problem of frequent start and stop of the water pump module is avoided, the control precision and efficiency of the cooling system of the converter station on the liquid level of the external cold water source are improved, and the service life of the water pump module is prolonged.
In one embodiment, as shown in fig. 2, step S104 includes step S202 and step S204.
S202, determine a dc power range to which the dc power belongs from the plurality of dc power ranges.
Each direct current power range corresponds to a control liquid level. It will be appreciated that the plurality of dc power ranges may be pre-set according to the operation of the converter station. For example, recording the dc power within a period of time, counting the upper limit and the lower limit of the dc power within the period of time, and dividing the dc power value between the upper limit and the lower limit of the dc power into a plurality of dc power ranges according to a preset ratio.
And S204, taking the control liquid level corresponding to the direct current power range as a target control liquid level.
In one embodiment, the plurality of DC power ranges is R1，R2...RNIn any DC power range RaIs greater than another DC power range RbIn the case of the upper limit value of (3), the power range RaCorresponding control level HaGreater than the power range RbCorresponding control level Hb。
For example, the dc power range is divided into a high load range, a medium load range and a low load range, the dc power of the converter station in the high load range is 80% to 100% of the rated dc power, the dc power of the converter station in the medium load range is 40% to 80% of the rated dc power, and the dc power of the converter station in the low load range is less than 40% of the rated dc power. The high load range corresponds to a high control level, the medium load range corresponds to a medium control level, and the low load range corresponds to a low control level. The high control liquid level is higher than the medium control liquid level, and the medium control liquid level is higher than the low control liquid level.
In one embodiment, as shown in fig. 3, step S104 includes step S302 and step S304.
S302, determining a control liquid level corresponding to the direct current power from the direct current power-control liquid level curve according to the direct current power.
The direct current power-control liquid level curve is used for reflecting the one-to-one corresponding relation between the direct current power and the control liquid level. It can be understood that the dc power-control liquid level curve may be formed by a superior control liquid level height at each dc power obtained from simulation, or may be fit by inputting the historical liquid level of the external cold water source and the historical dc power of the converter station into a machine learning model.
And S304, taking the control liquid level corresponding to the direct current power as a target control liquid level.
It should be understood that although the various steps in the flowcharts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.
The embodiment of the invention also provides a converter station cooling system, as shown in fig. 4, the converter station cooling system includes an external cold water source 10, a water pump module 30 and a control host 50. The external source of cold water 10 is used for cooling the internal cold water of the converter station 70. The water pump module 30 is used to supply cooling water to the external cold water source 10. It can be understood that the inner cooling system of the converter station 70 cools the converter station 70 by continuously taking away heat dissipated by high-temperature equipment in the converter station 70 through circulation of inner cooling water in an inner cooling pipeline, the temperature of the inner cooling water can continuously rise in the operation process, the inner cooling pipeline is cooled by the outer cooling water source 10, for example, the cooling water in the outer cooling water source 10 is sprayed on the inner cooling pipeline to cool the inner cooling water, and the inner cooling system can continuously and stably cool the converter station 70. Since the cooling water in the external cold water source 10 is gradually consumed, the water pump module 30 draws the cooling water from the water replenishing source and pumps the cooling water to the external cold water source 10, so as to replenish the cooling water to the external cold water source 10. The control host 50 is connected to the converter station 70 and the water pump module 30, and includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the control method of the converter station cooling system in any of the above embodiments when executing the computer program. The control master 50 may be a computer device within a monitoring room of the converter station 70 that provides an interactive interface to personnel so that the personnel can simultaneously monitor the operation of the converter station 70 and the condition of the cooling system of the converter station within the monitoring room. The control host can be selected from Windows or Linux host with strong operation capability and high stability.
Based on the control method of the converter station cooling system in the embodiment, the target control liquid level of the external cold water source 10 is set according to the direct-current power of the converter station 70, so that the liquid level of the external cold water source 10 is adaptively adjusted according to the heating condition of the converter station 70, sufficient cooling water is ensured to be in the external cold water source 10, the problem of frequent start and stop of the water pump module 30 is avoided, the control precision and efficiency of the converter station cooling system on the liquid level of the external cold water source 10 are improved, and the service life of the water pump module 30 is prolonged.
In one embodiment, as shown in fig. 5, the water pump module 30 includes a water pump 31, a driving unit 33, a first data processing unit 35, and a first internet of things communication unit 37. According to the invention, the target control liquid level needs to be adjusted in a self-adaptive manner, the required parameters are monitored on line based on the Internet of things, and the controlled equipment is controlled on line based on the Internet of things, so that the reaction speed and the control precision of the cooling system of the converter station can be improved, and the liquid level control precision of a cooling water source is further improved. The first internet of things communication unit 37 is configured to establish a communication connection with the control host 50 through the internet of things, and receive a water pump control command sent by the control host 50. The water pump control command is used to instruct the water pump 31 to operate so that the level of the external cold water source 10 is the same as the target control level. The first internet of things communication unit 37 may be a communication unit based on technologies such as bluetooth, WiFi, Lora, and cellular, and implements wireless communication connection with the control host 50. To increase the number of devices connected to the control host 50, each device may be communicatively connected to the control host 50 through a network connection device 53, as shown in fig. 6.
The first data processing unit 35 is connected with the first internet of things communication unit 37, and the first data processing unit 35 is used for analyzing the water pump control command according to a preset internet of things communication protocol. It can be understood that when data transmission is carried out through the internet of things, a preset internet of things communication protocol is required to be utilized to process data for guaranteeing transmission speed and transmission quality, and therefore in order to read useful information in the data, the data received through the internet of things need to be analyzed. The preset internet-of-things communication Protocol may be an MQTT (Message Queuing Telemetry Transport) Protocol, a COAP (Constrained Application Protocol) Protocol, an HTTP (Hypertext Transfer Protocol) Protocol, or the like. The driving unit 33 is connected to the first data processing unit 35, and is configured to drive the water pump 31 according to the analyzed water pump control command. Specifically, if the water pump 31 is an ac water pump, the driving unit 33 may output a PMW signal to the driving unit 33. If the water pump 31 is a dc water pump, the driving unit 33 may include a relay connected in series to a power supply loop of the dc water pump, and the relay will turn on or off the power supply loop of the water pump 31 according to a control command of the water pump.
In one embodiment, the water pump module 30 further comprises an air switch unit for disconnecting the power supply circuit of the water pump 31 in case of a short-circuit fault of the water pump 31. The air switch unit can protect the motor of the water pump 31 from overcurrent damage, and the tripping current value of the air switch unit is selected according to the specific parameters of the water pump 31. The air switch unit can be an air switch with good action characteristic, strong current breaking capability and stable operation.
In one embodiment, the water pump module 30 further includes a first power supply module, and the first power supply module includes a first power supply unit, a first solar charging unit, and a first energy storage unit. The first solar charging unit is used for charging the first energy storage unit by using solar energy. The first power supply unit is used for transmitting the electric energy provided by the first energy storage unit or the external power supply to the water pump 31, the first internet of things communication unit 37, the first data processing unit 35 and the driving unit 33. It can be understood that the first power supply unit may include a power switch, and the power switch is default to supply power to the electric device of the water pump module 30 by an external power source, and the power switch is switched to supply power to the first energy storage unit when detecting that the external power source fails, so that the power supply reliability of the water pump module 30 is ensured. Also can be when the power consumption that the electric energy quality that first energy storage unit provided can satisfy the consumer of water pump module 30 needs, the first energy storage unit power supply of acquiescence, when the power consumption that the electric energy quality that the power switch provided at first energy storage unit can't satisfy the consumer of water pump module 30 needs, switch to the external power source power supply, reduce the reliance of water pump module 30 to the external power source and improved water pump module 30's energy-conserving effect.
In one embodiment, the converter station cooling system further comprises a level sensor module 90, see fig. 6 and 7, the level sensor comprising a level probe 91, a second data processing unit 93 and a second networked communication unit 95. The liquid level probe 91 is used to obtain the liquid level of the external cold water source 10, and the liquid level probe 91 may be the liquid level probe 91 based on the ultrasonic wave principle, the floating ball principle or the laser principle. The second data processing unit 93 is connected with the liquid level probe 91 and is used for performing voltage transformation processing, filtering processing and analog-to-digital conversion processing on the liquid level of the external cold water source 10 fed back by the liquid level probe 91 and processing according to a preset internet of things communication protocol. It can be understood that, in order to ensure the accuracy of the liquid level of the external cold water source 10, the second data processing unit 93 performs a voltage transformation process and a filtering process on the liquid level of the external cold water source 10 fed back by the liquid level probe 91. The liquid level of the external cold water source 10 collected by the liquid level probe 91 is an analog signal, and in order to facilitate reading by computer equipment and transmission through the internet of things, the second data processing unit 93 performs analog-to-digital conversion processing on the liquid level of the external cold water source 10 subjected to voltage transformation processing and filtering processing, and converts the liquid level into a digital signal. Finally, the second data processing unit 93 can transmit the processed data to the second networking communication unit 95 after being processed according to the preset internet of things communication protocol, and the second networking communication unit 95 sends the liquid level of the external cold water source 10 to the control host 50.
In one embodiment, the liquid level sensor module 90 further includes a second power supply module including a second power supply unit, a second solar charging unit and a second energy storage unit. The second solar charging unit is used for charging the second energy storage unit by using solar energy. The second power supply unit is used for transmitting the electric energy provided by the second energy storage unit or the external power supply to the liquid level probe 91, the second processing unit and the second communication unit. The second power supply module is similar to the first power supply module, and reference may be made to the above.
In one embodiment, the level probe 91 includes a plurality of different types of level probes 91. The second data processing unit 93 is configured to perform voltage transformation processing, filtering processing, analog-to-digital conversion processing, and processing according to a preset internet of things communication protocol on the liquid level of the external cold water source 10 when the deviation between the liquid levels of the external cold water source 10 fed back by each liquid level probe 91 is smaller than a preset value. It can be understood that the different kinds of liquid level probes 91 refer to the liquid level probes 91 with different detection principles, and since the liquid level probes 91 of various kinds are easily affected by specific interference factors, the liquid level probes 91 of different kinds are mutually verified, and the accuracy of the liquid level of the transmitted external cold water source 10 is ensured.
In one embodiment, referring to FIG. 6, the converter station 70 is communicatively coupled to the control master 50 via a data isolation device 73. The data isolation device 73 is used for acquiring the dc power of the converter station 70 and transmitting the dc power to the control host 50. The data isolation device 73 may also ensure information security for various operational information, control information, etc. within the converter station 70. The data isolation device is an isolation device meeting the national network safety requirement, and the normal operation of the converter station cannot be influenced by the operation of the data isolation device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The control method of the converter station cooling system is characterized by comprising an external cold water source and a water pump module, wherein the external cold water source is used for cooling internal cold water of a converter station, the water pump module is used for supplementing cooling water to the external cold water source, and the control method of the converter station cooling system comprises the following steps:
acquiring direct current power of a converter station and the liquid level of the external cold water source;
determining a target control liquid level according to the direct current power;
and if the liquid level of the external cold water source is lower than the target control liquid level, controlling the water pump module to work so that the liquid level of the external cold water source is the same as the target control liquid level.
2. A method of controlling a converter station cooling system according to claim 1, characterized in that said step of determining a target control level based on said dc power comprises:
determining the direct current power range to which the direct current power belongs from a plurality of direct current power ranges; each direct current power range corresponds to a control liquid level;
and taking the control liquid level corresponding to the direct current power range as the target control liquid level.
3. The method of controlling a converter station cooling system according to claim 2, wherein said plurality of dc power ranges is R1，R2...RNIn any DC power range RaIs greater than another DC power range RbIn the case of the upper limit value of (3), the power range RaCorresponding control level HaGreater than the power range RbCorresponding control level Hb。
4. A method of controlling a converter station cooling system according to claim 1, characterized in that said step of determining a target control level based on said dc power comprises:
determining a control liquid level corresponding to the direct current power from a direct current power-control liquid level curve according to the direct current power; the direct current power-control liquid level curve is used for reflecting the one-to-one corresponding relation between the direct current power and the control liquid level;
and taking the control liquid level corresponding to the direct current power as the target control liquid level.
5. A converter station cooling system, comprising:
the external cold water source is used for cooling internal cold water of the converter station;
the water pump module is used for supplementing cooling water to the external cold water source;
the control host is connected with the converter station and the water pump module, and comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the control method of the converter station cooling system according to any one of claims 1 to 4 when executing the computer program.
6. The converter station cooling system of claim 5, wherein the water pump module comprises:
a water pump;
the first internet of things communication unit 37 is used for establishing communication connection with the control host through the internet of things and receiving a water pump control command sent by the control host; the water pump control command is used for indicating the water pump to work so that the liquid level of the external cold water source is the same as the target control liquid level;
the first data processing unit 35 is connected with the first internet of things communication unit 37 and used for analyzing the water pump control command according to a preset internet of things communication protocol;
and the driving unit is connected with the first data processing unit 35 and is used for driving the water pump according to the analyzed water pump control command.
7. The converter station cooling system according to claim 6, wherein said water pump module further comprises an air switch unit for disconnecting a power supply circuit of said water pump in case of a short circuit fault of said water pump.
8. The converter station cooling system according to claim 6, wherein the water pump module further comprises a first power supply module, and the first power supply module comprises a first power supply unit, a first solar charging unit, and a first energy storage unit;
the first solar charging unit is used for charging the first energy storage unit by using solar energy;
the first power supply unit is used for transmitting the electric energy provided by the first energy storage unit or the external power supply to the water pump, the first internet of things communication unit 37, the first data processing unit 35 and the driving unit.
9. The converter station cooling system according to claim 5, further comprising a level sensor module 90, said level sensor comprising:
the liquid level probe is used for acquiring the liquid level of the external cold water source;
the second data processing unit is connected with the liquid level probe and is used for performing voltage transformation processing, filtering processing and analog-to-digital conversion processing on the liquid level of the external cold water source fed back by the liquid level probe and processing the liquid level according to a preset Internet of things communication protocol;
and the second networking communication unit is connected with the second data processing unit and used for establishing communication connection with the control host through the Internet of things and sending the liquid level of the external cold water source processed by the second data processing unit to the control host.
10. The converter station cooling system according to claim 5, characterized in that said level probe comprises a plurality of different kinds of said level probes; the second data processing unit is used for performing variable pressure processing, filtering processing and analog-to-digital conversion processing on the liquid level of the external cold water source and processing according to a preset Internet of things communication protocol under the condition that the deviation between the liquid levels of the external cold water sources fed back by the liquid level probes is smaller than a preset value.
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EP3379570A1 (en) * 2017-03-21 2018-09-26 Siemens Aktiengesellschaft Method for operating a cooling device
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* Cited by examiner, † Cited by third party
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CN202734663U (en) * 2012-08-23 2013-02-13 中国南方电网有限责任公司超高压输电公司 Control system for external cooling water system of valve cooling system
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