CN112449549A - Cooling circulation device, control method and converter - Google Patents
Cooling circulation device, control method and converter Download PDFInfo
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- CN112449549A CN112449549A CN201910823605.3A CN201910823605A CN112449549A CN 112449549 A CN112449549 A CN 112449549A CN 201910823605 A CN201910823605 A CN 201910823605A CN 112449549 A CN112449549 A CN 112449549A
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- 238000001816 cooling Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012937 correction Methods 0.000 claims description 62
- 239000002826 coolant Substances 0.000 claims description 44
- 230000033228 biological regulation Effects 0.000 claims description 31
- 230000017525 heat dissipation Effects 0.000 claims description 14
- 238000004422 calculation algorithm Methods 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 3
- 238000001994 activation Methods 0.000 claims 2
- 230000032258 transport Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 7
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- 230000008859 change Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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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
- H05K7/20927—Liquid coolant without phase change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Power Engineering (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The embodiment of the application provides a cooling circulation device, a control method and a converter. The cooling circulation device comprises an inner circulation loop, an outer circulation loop and a three-way valve control module, the three-way valve control module is used for controlling the opening degree of the three-way valve according to the valve inlet temperature of the three-way valve and a preset valve opening temperature threshold value, and the external radiator control module is used for controlling the starting and stopping of the external radiator according to the valve inlet temperature of the three-way valve and a preset external radiator temperature threshold value. The embodiment of the application can simplify the logic of an open-loop control system of the cooling circulation device, and automatically restricts the boundary conditions through closed-loop control.
Description
Technical Field
The application relates to the technical field of cooling, in particular to a cooling circulation device, a control method and a converter.
Background
As shown in fig. 1, a cooling cycle device of a converter in the related art generally includes an inner circulation circuit and an outer circulation circuit. Wherein, the internal circulation loop comprises an internal heat exchange unit 104, an internal circulation cooling pipeline, a cooling pump 103 and a three-way valve 102 which are connected in a circulating way. The internal heat exchange unit 104 is disposed near the converter internal power module and transfers heat generated by the power module to the cooling medium in the internal circulation cooling duct.
The external circulation loop includes an external radiator 101 and an external circulation cooling pipe, and the external radiator 101 (for example, a radiator fan) is generally disposed outside the converter cabinet to radiate heat from the cooling medium in the external circulation cooling pipe. The external circulation circuit is connected to the internal circulation circuit by a three-way valve 102.
The cooling pipe is used for carrying a cooling medium, and the cooling pump 103 is used for driving the cooling medium to circulate. The external radiator 101 radiates heat from the cooling medium in the external circulation circuit, thereby indirectly cooling the internal heat exchange unit 104 through the internal circulation circuit.
In the prior art, an open-loop control method is adopted for controlling a cooling circulation device of a converter. When the external ambient temperature is above a certain threshold, the corresponding components in the cooling device are opened, e.g. the valve of the three-way valve 102 is opened, or the external radiator 101 is opened.
On the one hand, the external radiator 101 is opened after the three-way valve 102 is fully opened, that is, a fully-opened feedback signal of the three-way valve 102 is used as a necessary condition for opening the external radiator 101.
On the other hand, the number of the heat radiation fans is controlled to be started according to the temperature of the external environment. The external heat sink 101 comprises at least one heat dissipation fan, for example, one heat dissipation fan is turned on when the temperature reaches 32 ℃; when the temperature reaches 35 ℃, two cooling fans are started; when the temperature reaches 38 ℃, three cooling fans are started.
This control method requires manual input of all boundary conditions, which may be a temperature threshold at which the three-way valve is fully open, or a temperature threshold at which the radiator fan is activated, etc. Since the external ambient temperature is constantly changing, a designer needs to adjust the boundary conditions at intervals according to the operating data, or add more judgment logic to select the boundary conditions.
Therefore, how to automatically set the boundary conditions for the operation state transition of the cooling cycle device is an urgent problem to be solved.
Disclosure of Invention
The application provides a cooling circulation device, a control method and a converter aiming at the defects of the existing mode, and aims to solve the technical problem that the boundary conditions of a cooling system cannot be automatically constrained in the prior art.
In a first aspect, an embodiment of the present application provides a cooling cycle apparatus, including:
the internal circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner;
the external circulation loop comprises an external radiator, and is connected with the internal circulation loop through a three-way valve;
the cooling cycle device further includes:
the three-way valve control module is used for controlling the opening of the three-way valve according to the inlet valve temperature of the three-way valve and a preset valve opening temperature threshold value so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
the external radiator control module is used for controlling the starting and stopping of the external radiator according to the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
In a second aspect, embodiments of the present application provide a converter including a cooling cycle apparatus as above.
In a third aspect, an embodiment of the present application provides a method for controlling a cooling cycle apparatus, where the cooling cycle apparatus includes:
the internal circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner;
the external circulation loop comprises an external radiator, and is connected with the internal circulation loop through a three-way valve;
the control method comprises the following steps:
acquiring the inlet valve temperature of the three-way valve;
outputting a first control instruction based on the valve inlet temperature of the three-way valve and a preset valve opening temperature threshold, wherein the first control instruction is used for controlling the opening degree of the three-way valve so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
outputting a second control instruction based on the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value, wherein the second control instruction is used for starting and stopping the external radiator so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
In a fourth aspect, embodiments of the present application provide a control device for a cooling cycle device,
the cooling circulation device includes:
the internal circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner;
the external circulation loop comprises an external radiator, and is connected with the internal circulation loop through a three-way valve;
the control device includes:
the acquiring unit is used for acquiring the inlet valve temperature of the three-way valve;
the first control unit is used for outputting a first control instruction based on the valve inlet temperature of the three-way valve and a preset valve opening temperature threshold value, and the first control instruction is used for carrying out closed-loop regulation control on the three-way valve so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
the second control unit is used for outputting a second control instruction based on the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value, and the second control instruction is used for starting and stopping the external radiator so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the control method of the cooling system.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the embodiment of the application compares the inlet valve temperature of the three-way valve according to the cooling circulation device and the preset valve opening temperature threshold value, the closed-loop regulation control of the three-way valve is carried out, the inlet valve temperature of the three-way valve and the preset external radiator temperature threshold value are compared, the closed-loop regulation control of the external radiator is carried out, the logic of an original open-loop control system can be simplified through the output control command, meanwhile, the closed-loop control can automatically restrict the boundary conditions of the cooling circulation device, the behavior of the cooling circulation device is optimized, the robustness of the fan converter cooling circulation device is improved, and the energy consumption of the cooling circulation device is reduced.
The embodiment of the application introduces decoupling control of the three-way valve and the external radiator, and the starting of the external radiator does not depend on the three-way valve being completely opened. When the water temperature slowly rises, the fan is started again after the three-way valve is completely opened; when the water temperature rises faster, the external radiator is started in advance to stabilize the water temperature.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a prior art cooling cycle apparatus;
FIG. 2 is a schematic structural diagram of a cooling cycle apparatus according to an embodiment of the present disclosure;
FIG. 3 is another schematic diagram of a cooling cycle apparatus according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of the control logic of a second cooling cycle apparatus according to an embodiment of the present application;
FIG. 5 is a flowchart of a control method of a three-cooling cycle apparatus according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating a relationship between a temperature of a three-way valve and an opening of the three-way valve according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating the relationship between the temperature of the triple valve and the opening of the external radiator according to the embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a relationship between an opening of a three-way valve and an opening of an external radiator according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram illustrating a comparison of the operation of three external radiators according to an embodiment of the present application;
FIG. 10 is a schematic diagram illustrating a comparison between the operation of three-way valves according to an embodiment of the present application;
fig. 11 is a block diagram showing a control device of a four-cooling cycle device according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
Example one
The embodiment of the application provides a cooling circulation device, as shown in fig. 2, the cooling circulation device comprises an inner circulation loop and an outer circulation loop. The internal circulation loop comprises an internal heat exchange unit 104 and a three-way valve 102 which are circularly connected; the outer circulation loop includes an external radiator 101, and the outer circulation loop is connected to the inner circulation loop by a three-way valve 102.
In one example, both the inner circulation loop and the outer circulation loop are composed of cooling pipes, and the cooling pump 103 drives a cooling medium to circulate inside the cooling pipes so as to cool the internal heat exchange unit 104.
Specifically, the internal circulation loop includes an internal heat exchange unit 104, an internal circulation cooling pipe, a cooling pump 103, and a three-way valve 102 that are circularly connected. The internal heat exchange unit 104 is disposed near the converter internal power module and transfers heat generated by the converter internal power module to the cooling medium in the internal circulation cooling duct. For example, the converter power module is composed of IGBT elements, the high temperature of the external environment may cause the IGBT elements to report an overheat fault due to over-temperature, and the internal heat exchange unit 104 may be disposed near the power module to exchange heat with the power module.
The external circulation loop includes an external radiator 101 and an external circulation cooling pipe, and the external radiator 101 (for example, a radiator fan) is generally disposed outside the converter cabinet to radiate heat from the cooling medium in the external circulation cooling pipe. The external circulation circuit is connected to the internal circulation circuit by a three-way valve 102. Three-way valve 102 is fully open indicating an outer cycle and fully closed indicating an inner cycle. When the opening degree of the three-way valve 102 increases, the flow rate of the cooling medium in the outer circulation circuit increases, and the flow rate of the cooling medium in the inner circulation circuit decreases.
The cooling cycle apparatus provided in the present embodiment further includes a three-way valve control module 106 and an external radiator control module 105.
The three-way valve control module 106 is configured to control the opening of the three-way valve 102 according to the inlet valve temperature of the three-way valve 102 and a preset valve opening temperature threshold, so as to control the flow rates of the cooling medium in the inner circulation circuit and the outer circulation circuit. The external radiator control module 105 is configured to perform start-stop control on the external radiator 101 according to the inlet valve temperature of the three-way valve 102 and a preset external radiator temperature threshold value, so that the inlet valve temperature of the three-way valve 102 is kept at a preset temperature value; wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
The term "inlet valve temperature of three-way valve 102" means the temperature of the cooling medium at the inlet of three-way valve 102.
In this embodiment, the three-way valve control module 106 of the cooling cycle apparatus controls the opening degree of the three-way valve 102, compares the inlet valve temperature of the three-way valve 102 with a preset valve opening temperature threshold, and controls the opening of the three-way valve 102; the external radiator control module 105 performs start-stop control on the external radiator 101, compares the inlet valve temperature of the three-way valve 102 with a preset external radiator temperature threshold, and performs start-stop control on the external radiator 101. The control command output in this way can simplify the logic of the original open-loop control system, introduce the inlet valve temperature of the three-way valve 102 into the cycle control process, and realize closed-loop control; meanwhile, the closed-loop regulation control can automatically restrict the boundary conditions of the cooling circulation device, so that the behavior of the cooling circulation device is optimized, and the robustness of the cooling circulation device is improved.
Optionally, an outlet of the internal heat exchange unit 104 is connected to an inlet of the three-way valve 102, and a first outlet of the three-way valve 102 is connected to an inlet of the internal heat exchange unit 104; an external radiator 101 is disposed between the second outlet of three-way valve 102 and the inlet of internal heat exchange unit 104.
The first outlet of the three-way valve 102 corresponds to the internal circulation circuit, the second outlet corresponds to the external circulation circuit, and the flow rates of the cooling medium in the internal circulation circuit and the external circulation circuit are controlled by controlling the opening degree of the three-way valve 102.
The external circulation loop conveys the first part of cooling medium in the internal circulation loop to the external radiator 101 for heat dissipation, and mixes the first part of cooling medium after heat dissipation with the second part of cooling medium in the internal circulation loop.
Optionally, the valve opening temperature threshold set by the three-way valve control module 106 is a first temperature threshold T1Or, the three-way valve control module 106 sets the valve opening temperature threshold to be a temperature range including the second temperature threshold T2And a third temperature threshold T3。
When the valve opening temperature threshold set by the three-way valve control module 106 is the first temperature threshold T1If the inlet valve temperature of three-way valve 102 is greater than first temperature threshold T1Then, the opening degree of the three-way valve 102 is increased step by step, thereby increasing the flow rate of the cooling medium in the external circulation circuit; if the inlet valve temperature of three-way valve 102 is less than first temperature threshold T1The opening degree of the three-way valve 102 is gradually decreased, thereby decreasing the flow rate of the cooling medium in the outer circulation circuit.
Wherein, when the valve opening temperature threshold set by the three-way valve control module 106 is the second temperature threshold T2And a third temperature threshold T3Within a defined temperature interval, if the inlet valve temperature of three-way valve 102 is greater than a second temperature threshold T2The opening degree of three-way valve 102 is increased stepwise, and if the intake valve temperature of three-way valve 102 is less than third temperature threshold value T3The opening degree of three-way valve 102 is gradually decreased. The second temperature threshold T is normally set2Greater than a third temperature threshold T3。
Whether the external radiator 101 is activated in the related art depends on the degree of opening of the three-way valve 102. For example, when the temperature of the cooling medium is higher than the threshold value, the external radiator 101 is activated after the three-way valve 102 is fully opened, and the temperature of the cooling medium in the circulation loop is too high due to the hysteresis of the heat dissipation effect, so that the converter power module has an over-temperature fault.
Referring to fig. 3, the external radiator control module 105 in this embodiment further includes an increment submodule for setting an increment of the external radiator control amount according to the current opening degree of the three-way valve 102, and setting a temperature threshold T preset by the external radiator4And carrying out closed-loop control on the starting and stopping of the external radiator.
In this embodiment, when the intake valve temperature of three-way valve 102 slowly rises, three-way valve 102 is opened to the maximum opening degree to activate external radiator 101; when the intake valve temperature of the three-way valve 102 rapidly rises, the external radiator 101 is activated when the three-way valve 102 is partially opened, and the external radiator is activated in advance, thereby suppressing the temperature rise rate of the cooling medium and stabilizing the temperature of the cooling medium.
In an alternative embodiment, the opening degree control of the three-way valve 102 and the start-stop control of the external radiator 101 include PID closed-loop regulation control, but are not limited to this control, as long as the closed-loop control can achieve the purpose in the foregoing embodiments.
In an alternative embodiment, the external heat sink 101 comprises at least one heat dissipation fan, and the external heat sink control module is configured to control the number and the time of activation of the at least one heat dissipation fan.
In an optional embodiment, the converter is a wind turbine converter. The output power of the wind power converter changes along with the change of the wind speed. Particularly, when the wind speed is suddenly increased, the temperature of the converter power module is suddenly increased, and the external radiator 101 can be activated when the three-way valve 102 is partially opened, so that the external radiator can be started in advance, the temperature increase speed of the cooling medium can be suppressed, and the heat radiation effect can be improved.
Example two
The present embodiment provides a control method of a cooling cycle apparatus including an inner circulation circuit and an outer circulation circuit. The inner circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner, the outer circulation loop comprises an external radiator, and the outer circulation loop is connected with the inner circulation loop through the three-way valve. The structure of the cooling circulation device is the same as that of the first embodiment, and is not described in detail.
The control logic of the present embodiment is explained with reference to fig. 4. Taking the valve opening temperature threshold T1 and the valve inlet temperature T of the three-way valve as input parameters of a PI algorithm of the three-way valve, obtaining the opening degree of the three-way valve through the PI algorithm, and completing closed-loop regulation control of the three-way valve; the temperature threshold T4 and the inlet valve temperature T of the external radiator are used as input parameters of a PI controller of the external radiator, the control quantity of the external radiator is obtained through a PI algorithm, meanwhile, the limit feedback of a three-way valve is accumulated, and closed-loop regulation control is carried out on the external radiator after decoupling control is carried out.
When the three-way valve or the external heat dissipation fan is opened, the temperature of the cooling liquid is reduced, which is equivalent to hiding a negative sign in the cooling liquid circulation system in the control logic. Therefore, the closed-loop control method provided by the present embodiment is different from the conventional negative feedback control, that is, the set value takes a negative value and the feedback value takes a positive value.
The limiting feedback of the three-way valve is used for completing the decoupling control of the external radiator and the three-way valve.
The meaning of "decoupling" is explained below.
In the prior art, the external radiator can be started only after the three-way valve is fully opened. The embodiment provides a decoupling control mode, and the starting and stopping control of the external radiator does not depend on the full-open state of the three-way valve, but controls the starting and stopping of the external radiator according to the valve opening stroke of the three-way valve.
When the three-way valve is partially opened, if the inlet valve temperature change speed of the three-way valve is high, the external radiator is started in advance through closed-loop regulation control of the external radiator. For example, when the three-way valve inlet temperature rises too fast and the three-way valve is opened by half, the external radiator is started in advance, thereby stabilizing the temperature of the cooling medium.
The control method provided in the present embodiment is explained in detail below.
The control method comprises the following steps:
s301, acquiring the inlet valve temperature of the three-way valve;
s302, outputting a first control instruction based on the inlet valve temperature of the three-way valve and a preset valve opening temperature threshold, wherein the first control instruction is used for controlling the opening of the three-way valve so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
and S303, outputting a second control instruction based on the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value, wherein the second control instruction is used for starting and stopping control of the external radiator so as to keep the inlet valve temperature of the three-way valve at a preset temperature value.
The three-way valve is subjected to closed-loop control by acquiring the inlet valve temperature of the three-way valve in the cooling circulation device, and the external radiator is subjected to closed-loop control, so that the output control command can simplify the logic of the original open-loop control system, and meanwhile, the boundary conditions of the cooling system can be automatically constrained by closed-loop regulation control, so that the behavior of the cooling circulation device is optimized, and the robustness of the cooling circulation device is improved.
In an alternative embodiment, the closed-loop regulation control is proportional-integral control, i.e. PI control, but is not limited to this control, as long as the objective of the foregoing embodiment is achieved.
In the step S302, the step of outputting the first control command based on the intake valve temperature of the three-way valve and the preset valve opening temperature threshold includes two embodiments.
The first embodiment:
setting the valve opening temperature threshold as a first temperature threshold, and comparing the valve inlet temperature of the three-way valve with the first temperature threshold to obtain a first temperature correction value;
and performing closed-loop regulation based on the first temperature correction value to output a first control instruction.
For example, the valve opening temperature threshold is set to the first temperature threshold T1Comparing the inlet valve temperature T of the three-way valve with a first temperature threshold value T1Obtaining a first temperature correction value et(k) Is T-T1. Performing closed-loop regulation based on the first temperature correction value to output a first control instruction, and if the inlet valve temperature T of the three-way valve is greater than a first temperature threshold value T1Gradually increasing the opening degree of the three-way valve; if the inlet valve temperature T of the three-way valve is less than the first temperature threshold value T1Gradually reducing the opening degree of the three-way valve so as to stabilize the inlet valve temperature of the three-way valve at T1Nearby.
The second embodiment:
setting the valve opening temperature threshold value to be a temperature interval limited by a second temperature threshold value and a third temperature threshold value, comparing the valve inlet temperature of the three-way valve with the second temperature threshold value to obtain a second temperature correction value, and comparing the valve inlet temperature of the three-way valve with the third temperature threshold value to obtain a third temperature correction value;
and performing closed-loop regulation based on the second temperature correction value and the third temperature correction value to output a first control instruction.
For example, the valve opening temperature threshold is set to the second temperature threshold T2And a third temperature threshold T3A defined temperature interval, a second temperature threshold T2Greater than a third temperature threshold T3. Comparing the inlet valve temperature T of the three-way valve with a second temperature threshold T2Obtaining a second temperature correction value, and comparing the inlet valve temperature T of the three-way valve with a third temperature threshold value T3A third temperature correction value is obtained.
Second temperature threshold T2Greater than a third temperature threshold T3If the forward valve temperature T is greater than the second temperature threshold T2Then, a second temperature correction value e is obtainedt(k) Is T-T2(ii) a If the temperature T of the forward valve is less than or equal to the second temperature threshold T2And is greater than or equal to the third temperature threshold T3Correction value e of time and temperaturet(k) Is zero; if the forward valve temperature T is less than the third temperature threshold T3Time, third temperature correction value et(k) Is T-T3。
Setting the temperature control of the three-way valve as an interval control mode, and when the temperature is greater than a second temperature threshold value T2Only then the three-way valve is opened, i.e. the second temperature threshold T2A valve opening temperature threshold; when the temperature is lower than the third temperature threshold T3When the temperature of the third temperature threshold is lower than the threshold, the three-way valve is closed, namely the third temperature threshold is the valve closing temperature threshold.
In step S303, the step of outputting a second control command based on the intake valve temperature of the three-way valve and a preset external radiator temperature threshold includes:
and comparing the inlet valve temperature of the three-way valve with a preset external radiator temperature threshold value to obtain a fourth temperature correction value, and performing closed-loop regulation to output the external radiator control quantity based on the fourth temperature correction value.
For example, the temperature threshold T of the external radiator4Comparing with inlet valve temperature of three-way valve to obtain fourth temperature correction value e of external radiatorf(k)＝T-T4And performing closed-loop regulation to output the external radiator control quantity based on the fourth temperature correction value.
Wherein a temperature threshold T of the external heat sink is set4The control aims to stabilize the inlet valve temperature of the three-way valve at T4Nearby.
It should be noted that, in order to complete the decoupling control of the external radiator and the three-way valve, step S303 further includes:
acquiring the current opening degree of the three-way valve;
setting the increment of the control quantity of the external radiator according to the current opening of the three-way valve;
outputting a second control instruction based on the accumulated value of the external radiator control amount and the increment.
That is to say, the external radiator also performs closed-loop adjustment control according to the increment value of the three-way valve, obtains the increment value of the external radiator by obtaining the opening degree of the three-way valve and comparing the opening degree with the maximum opening degree of the three-way valve, completes decoupling based on the opening degree of the three-way valve, and performs temperature threshold T preset by the external radiator4And performing closed-loop regulation control and outputting a second control instruction.
And the valve opening temperature threshold of the three-way valve is smaller than the temperature threshold of the external radiator. The first temperature threshold, the second temperature threshold, and the third temperature threshold are all smaller than the temperature threshold set by the external radiator, regardless of whether the valve opening temperature threshold of the three-way valve is the first temperature threshold or one temperature section defined by the second temperature threshold and the third temperature threshold. The larger the difference between the temperature threshold of the three-way valve and the temperature threshold of the external radiator is, the lower the control coupling degree of the three-way valve and the external radiator is.
The embodiment of the application carries out closed-loop regulation control on the three-way valve by comparing the inlet valve temperature of the three-way valve of the cooling circulation device with the preset valve opening temperature threshold value, carries out closed-loop regulation control on the external radiator by comparing the inlet valve temperature of the three-way valve with the preset external radiator temperature threshold value, and the output control command can simplify the logic of an original open-loop control system, and meanwhile, the closed-loop control can automatically restrict the boundary condition of the cooling circulation device, thereby optimizing the behavior of the cooling circulation device and improving the robustness of the cooling circulation device of the fan converter.
The embodiment of the application introduces the decoupling control of the three-way valve and the external radiator, the starting of the external radiator does not depend on the three-way valve to be completely opened, and the energy consumption of the cooling circulation device can be reduced.
EXAMPLE III
The present embodiment provides a control method of a cooling cycle apparatus, which will be described in detail below with reference to fig. 5.
Specifically, referring to fig. 5, the detailed process of the flow of the control method of the cooling cycle device using closed-loop regulation is as follows:
s501, setting a valve opening temperature threshold value as a first temperature threshold value T1Comparing the inlet valve temperature T of the three-way valve with a first temperature threshold value T1Obtaining a first temperature correction value:
et(k)＝T-T1
in another example, the valve opening temperature threshold is a temperature interval including a second temperature threshold T2And a third temperature threshold T3Second temperature threshold T2Greater than a third temperature threshold T3. Comparing the inlet valve temperature T of the three-way valve with a second temperature threshold T2Obtaining a second temperature correction value, and comparing the inlet valve temperature T of the three-way valve with a third temperature threshold value T3A third temperature correction value is obtained.
Wherein e ist(k) T is the inlet valve temperature of the three-way valve.
S502, correcting value e according to temperaturet(k) Performing PI calculation to obtain a first output value, wherein the specific calculation mode is as follows:
yt(k)＝dyt(k)+yt(k-1)；
wherein, KiIs the integral coefficient, KpIs a proportionality coefficient, k represents the number of operations accumulated, yt(k) Indicating the first output value and dT the operation period.
Since the three-way valve only receives an opening or closing instruction, the calculated first output value needs to be subjected to a regularization mode to obtain a control quantity which can be received by the three-way valve.
S503, normalizing the first output value into a first control instruction of the three-way valve, specifically:
wherein Y ist(K) Representing a first control instruction of the three-way valve, K representing the number of times of each action of the three-way valve, the current time being the Kth time, K representing the number of times of operation, t representing the current time, t-tK-1Represents the time interval between the current time and the last action of the three-way valve, DT represents the minimum time interval between two actions of the three-way valve, and INT () represents the rounding function.
The three-way valve receives a first control instruction Yt(K) Thereafter, the valve can be opened or closed. Y ist(K) When the time is positive, the three-way valve is opened by corresponding integral step length; y ist(K) When the voltage is negative, the three-way valve is closed by corresponding integer number of stepping lengths; y ist(K) When the value is zero, the three-way valve does not act.
Regularizing the control quantity Y in order to protect the motor of the three-way valvet(K) L is less than or equal to L, wherein L is the maximum number of steps allowed by single step motor action. The opening and closing of the valve affects the setting of L.
S504, setting the temperature threshold T of the external radiator4And comparing the temperature of the inlet valve with the temperature of the inlet valve of the three-way valve to obtain a temperature correction value of the external radiator:
ef(k)＝T-T4
wherein e isf(k) T is the inlet valve temperature of the three-way valve, which is the temperature correction value of the external radiator.
S505, correcting value e according to temperature of external radiatorf(k) Performing PI calculation to obtain a second output value, wherein the second output value represents the control quantity of the external radiator, and the specific calculation mode is as follows:
yf(k)＝dyf(k)+yf(k-1)
wherein, KiIs the integral coefficient, KpIs a proportionality coefficient, k represents the number of operations accumulated, yf(k) Indicating the second output value and dT the operation period.
In the prior art, the external radiator can be opened only by fully opening the three-way valve, and the external radiator is coupled with the control of the three-way valve. Therefore, in this embodiment, decoupling control needs to be performed on the external radiator, and decoupling is performed through the opening degree of the three-way valve.
And S506, obtaining a decoupling value of the external radiator according to the opening of the three-way valve, and calculating the increment of the control quantity of the external radiator according to the decoupling value.
The specific calculation mode of the decoupling value is as follows:
ed(k)＝YD-Yd(k)
wherein e isd(k) To a decoupling value, YDMaximum opening of the three-way valve, Yd(k) The current opening of the three-way valve.
The maximum opening of the three-way valve represents the total steps required by the stroke from full closing to full opening, and the total steps are obtained through statistics of the acquisition device, but the maximum opening of the three-way valve is possibly inaccurate and can change, so that the condition that the water temperature is not increased too fast under the working condition of a windy start after the PLC is restarted needs to be considered, and Y is consideredDIs set to a smaller value.
Calculating the increment of the control quantity of the external radiator according to the decoupling value, specifically:
wherein, Ki2Is the integral coefficient, Kp2Is a proportionality coefficient, k represents the number of operations accumulated, ed(k) For the decoupling value, dy1(k) denotes a third output value, and dT denotes an operation cycle.
S507, performing accumulation calculation according to the control quantity and the increment of the external radiator to obtain an actual control quantity, wherein the specific calculation mode is as follows:
yf*(k)＝dyf(k)+yf(k-1)-dy1(k)
wherein, Ki2Is the integral coefficient, Kp2Is a proportionality coefficient, k represents the number of operations accumulated, ed(k) To the decoupling value, yfAnd x (k) represents an actual control quantity, and dT represents an operation period.
Through PI control of the external radiator, when the temperature of the inlet valve slowly rises, the external radiator is started again after the three-way valve is completely opened; when the temperature of the inlet valve rises quickly, the external radiator is started in advance to stabilize the water temperature.
S508, normalizing the actual control quantity into a second control instruction of the external heat sink, specifically:
Yf＝INT(yf*(k))
wherein INT () represents a rounding function; y isfIndicating the number of external heat sinks (e.g., heat dissipation fans) that need to be turned on.
The external heat sink receives the second control command, which is the number of the heat dissipation fans that need to be turned on, for example, when the received second control command is 2, two heat dissipation fans are turned on.
Considering that the opening degree and the heat dissipation effect of the fan are linear, the control quantity y is controlled to avoid integral saturationf(k) The lower limit is 0 and the upper limit is LbWherein L isbRepresents the total available number of fans, so 0 ≦ Yf≤Lb。
In the external radiator start-stop control process, the external radiator needs to be subjected to work time balance control, start-stop intervals need to be considered, the external radiator is started in sequence in a circulating mode, and the external radiator start-stop control is completed by the external radiator start-stop control module.
The effects of the present embodiment will be explained below.
As shown in fig. 6, due to T1For optimum operating temperature of the cooling medium, and T1＜T4The control target of the three-way valve is to stabilize the water temperature of the inlet valve at T1Therefore, if the water temperature rises smoothly, the three-way valve is already opened to 100% before the external radiator is opened, as shown by the solid line in the figure; if the water temperature rises quickly, the three-way valve is not controlled enough to stabilize the water temperature at T1If the three-way valve is less than 100%, the water temperature will exceed T1The actual curve may be shown as a dashed line in the figure, but the three-way valve itself has no position feedback and can only be estimated by programmed counting, and the course of the dashed line cannot be determined.
As shown in FIG. 7, the objective of the external radiator control is to stabilize the inlet valve temperature of the three-way valve at the temperature threshold T of the external radiator4. In view of reduction of power consumption, T4The temperature of the water cannot be too small, and the water temperature is not enough to trigger the high water temperature fault only by the inlet valve temperature fluctuation process. If the intake valve temperature does not fluctuate or rise much, the number of the external radiators opened is shown by a solid line in the figure, and if the intake valve temperature fluctuates much or the water temperature rises quickly, the operating condition shown by a broken line in the figure occurs.
Referring to fig. 8, normally, the relationship between the three-way valve opening degree and the number of open external radiators is the most power-saving mode as shown by the solid line in fig. 8. After increasing the PI control of the three-way valve and the decoupling PI control of the external radiator, the full open feedback of the three-way valve is not needed to be used as the necessary condition for opening the external radiator, when the inlet valve temperature rises too fast and the three-way valve is not enough to control, the external radiator is opened in advance to assist in radiating, and the actual operation is as shown by a dotted line in figure 8. Under the condition of not increasing additional equipment, the corresponding scheduling time of the fan power is greatly shortened, and meanwhile, the stable operation of the fan is not influenced.
Referring to fig. 9, fig. 9 shows the operation condition of the external radiator of each wind turbine of a selected wind farm every day, and after the cooling system control method is selected, although the number of times of starting the external radiator is increased, the total operation time of the external radiator is obviously reduced from 5648s to 3102s at present. With the reduction of the operation time, the power consumption of the wind turbine is correspondingly reduced.
Referring to fig. 10, fig. 10 shows the operation condition of the three-way valve of each wind turbine of a certain wind farm every day, and after the control method of the cooling system is selected, the number of times of opening and closing the three-way valve is obviously reduced from 462 times to 80 times, and accordingly, the energy loss is also reduced. The consumption of 3500 water chilling units in the country is reduced by 180 thousands of kWh/year by calculating 1.5 kWh/unit/day, and the annual energy production can be improved by nearly 0.02% by a cooling system project.
Example four
Based on the same inventive concept, a control device of a cooling cycle device is provided, and the specific structure is shown in fig. 11.
The control device includes:
the acquiring unit is used for acquiring the inlet valve temperature of the three-way valve;
the first control unit is used for outputting a first control instruction based on the inlet valve temperature of a three-way valve and a preset valve opening temperature threshold value, and the first control instruction is used for carrying out closed-loop regulation control on the three-way valve so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
the second control unit is used for outputting a second control instruction based on the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value, and the second control instruction is used for starting and stopping the external radiator so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
In an optional embodiment, the first control unit specifically includes:
the first correction module is used for setting a valve opening temperature threshold value as a first temperature threshold value, comparing the valve inlet temperature of the three-way valve with the first temperature threshold value to obtain a first temperature correction value, and performing closed-loop regulation to output a first control instruction based on the first temperature correction value, or;
the second correction module is used for setting the valve opening temperature threshold value to be a temperature interval limited by a second temperature threshold value and a third temperature threshold value, comparing the valve inlet temperature of the three-way valve with the second temperature threshold value to obtain a second temperature correction value, and comparing the valve inlet temperature of the three-way valve with the third temperature threshold value to obtain a third temperature correction value; and performing closed-loop regulation based on the second temperature correction value and the third temperature correction value to output a first control instruction.
Wherein the first correction module sets the valve opening temperature threshold T as a first temperature threshold T1Comparing the inlet valve temperature of the three-way valve with a first temperature threshold T1Obtaining a first temperature correction value et(k) Is T-T1. The inlet valve temperature of the three-way valve is greater than a first temperature threshold T1Gradually opening the opening degree of the three-way valve, wherein the inlet valve temperature of the three-way valve is less than a first temperature threshold value T1The opening degree of the three-way valve is gradually closed.
The second correction module sets the valve opening temperature threshold value as a temperature interval, and the end point of the temperature interval comprises a second temperature threshold value T2And a third temperature threshold T3Comparing the inlet valve temperature T of the three-way valve with a second temperature threshold value T2Obtaining a second temperature correction value et(k) Comparing the inlet valve temperature T of the three-way valve with a third temperature threshold value T3Obtaining a third temperature correction value et(k)。
Second temperature threshold T2Greater than a third temperature threshold T3: if the temperature T of the forward valve is greater than the second temperature thresholdT2Then, a second temperature correction value e is obtainedt(k) Is T-T2(ii) a If the temperature T of the forward valve is less than or equal to the second temperature threshold T2And is greater than or equal to the third temperature threshold T3Correction value e of time and temperaturet(k) Is zero; if the forward valve temperature T is less than the third temperature threshold T3Time, third temperature correction value et(k) Is T-T3。
Setting the temperature control of the three-way valve as an interval control mode, and when the temperature is greater than a second temperature threshold value T2Only then the three-way valve is opened, i.e. the second temperature threshold T2A valve opening temperature threshold; when the temperature is lower than the third temperature threshold T3When the temperature of the third temperature threshold is lower than the threshold, the three-way valve is closed, namely the third temperature threshold is the valve closing temperature threshold.
In an alternative embodiment, the temperature threshold of the three-way valve is less than the temperature threshold of the external radiator. Irrespective of whether the temperature threshold of the three-way valve is the first temperature threshold T1Or the second temperature threshold and the third temperature threshold T3Is less than the temperature threshold set by the external radiator. The larger the difference between the temperature threshold of the three-way valve and the temperature threshold of the external radiator is, the lower the control coupling degree of the three-way valve and the external radiator is.
In an alternative embodiment, the second control unit comprises a third correction module, the third correction module is used for comparing the inlet valve temperature of the three-way valve with a preset external radiator temperature threshold value to obtain a fourth temperature correction value, and the third correction module is used for performing closed-loop regulation on the control quantity of the external radiator based on the fourth temperature correction value.
In an optional embodiment, the second control unit further includes an increment module, which obtains a current opening degree of the three-way valve, sets an increment of the external radiator control amount according to the current opening degree of the three-way valve, and outputs a second control instruction based on the external radiator control amount and an accumulated value of the increments. The second control instruction is used for controlling the starting number and the starting time of the at least one radiating fan when the three-way valve is partially opened.
The function that the increment module realized is, when the three-way valve part was opened, through the closed loop regulation control of outside radiator start the outside radiator in advance.
In one example, the control device of the cooling circulation device is integrated in the controller of the cooling circulation device of the converter of the wind generating set.
The specific processing procedures in the control device of the cooling cycle device are substantially identical to the control method of the cooling cycle device, and are not described herein again.
The embodiment shown in fig. 11 achieves at least the following advantages:
firstly, a first control unit is added in the cooling circulation device to carry out PI control on a three-way valve, a second control unit is added to carry out PI control on external radiator decoupling, so that the output control command can simplify the logic of the original open-loop control system, and meanwhile, the closed-loop control can automatically restrict the boundary conditions of the cooling circulation device, thereby optimizing the behavior of the cooling circulation device and improving the robustness of the cooling circulation device of the fan converter;
secondly, because the original cooling circulation device needs to artificially set temperature boundary conditions, and the temperature threshold is selected according to past experience, the PI control of the three-way valve and the PI control after the decoupling of the external radiator are introduced, so that the boundary conditions of the cooling circulation device do not need to be artificially adjusted, unnecessary waste of temperature adjustment caused by the fact that the artificially set temperature is not suitable for the current environment condition of the cooling circulation device is avoided, and the energy consumption of the cooling circulation device can be reduced.
Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing a control method of a cooling cycle apparatus provided by the foregoing embodiments of the present application.
The computer readable medium includes, but is not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs, RAMs, EPROMs (Erasable Programmable Read-Only memories), EEPROMs, flash memories, magnetic cards, or optical cards. That is, readable media includes any medium that can store or transfer information in a form readable by a system (e.g., a computer).
The computer-readable storage medium provided in the embodiments of the present application has the same inventive concept and the same advantageous effects as those of the foregoing embodiments, and is not described herein again.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
It should be understood that, although the steps in the flowcharts of the figures 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 may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-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 alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (22)
1. A cooling cycle apparatus comprising:
the internal circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner;
an outer circulation loop including an external radiator, the outer circulation loop being connected with the inner circulation loop through the three-way valve;
characterized in that, the cooling cycle device further includes:
the three-way valve control module is used for controlling the opening of the three-way valve according to the inlet valve temperature of the three-way valve and a preset valve opening temperature threshold value so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
the external radiator control module is used for controlling starting and stopping of the external radiator according to the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
2. The cooling cycle apparatus of claim 1, wherein an outlet of the internal heat exchange unit is connected to an inlet of the three-way valve, and a first outlet of the three-way valve is connected to an inlet of the internal heat exchange unit;
the external radiator is disposed between the second outlet of the three-way valve and the inlet of the internal heat exchange unit.
3. The cooling circulation device of claim 1, wherein the outer circulation loop transports a first part of the cooling medium in the inner circulation loop to an external radiator for heat dissipation, and mixes the first part of the cooling medium after heat dissipation with a second part of the cooling medium in the inner circulation loop.
4. The cooling cycle apparatus of claim 1, wherein the valve opening temperature threshold set by the three-way valve control module is a first temperature threshold; or
The valve opening temperature threshold set by the three-way valve control module is set to be a temperature interval limited by a second temperature threshold and a third temperature threshold.
5. The cooling cycle apparatus according to any one of claims 1 to 4, wherein the external radiator control module further includes an increase sub-module for setting an increase of the external radiator control amount according to a current opening degree of the three-way valve.
6. The cooling cycle apparatus of claim 5,
the three-way valve control module is used for controlling the opening of the three-way valve according to a closed-loop algorithm according to the difference value of the inlet valve temperature and the valve opening temperature threshold of the three-way valve;
and the external radiator control module is used for calculating the control quantity of the external radiator according to a closed-loop algorithm according to the difference value between the inlet valve temperature of the three-way valve and the temperature threshold value, accumulating the control quantity of the external radiator and the increment, and controlling the starting and stopping of the external radiator according to the accumulated result.
7. The cooling cycle apparatus of claim 1, wherein the external heat sink includes at least one heat sink fan, and the external heat sink control module is configured to control the number of activations and activation time of the heat sink fans.
8. A current transformer comprising the cooling cycle apparatus as claimed in any one of claims 1 to 7,
the internal heat exchange unit is arranged inside the converter cabinet body, and the external radiator is arranged outside the converter cabinet body.
9. The converter of claim 8, wherein the converter is a wind turbine converter.
10. A control method of a cooling cycle apparatus, the cooling cycle apparatus comprising:
the internal circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner;
an outer circulation loop including an external radiator, the outer circulation loop being connected with the inner circulation loop through the three-way valve;
the control method is characterized by comprising the following steps:
acquiring the inlet valve temperature of the three-way valve;
outputting a first control instruction based on the inlet valve temperature of the three-way valve and a preset valve opening temperature threshold, wherein the first control instruction is used for controlling the opening degree of the three-way valve so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
outputting a second control instruction based on the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value, wherein the second control instruction is used for starting and stopping the external radiator so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
11. The control method according to claim 10, wherein the step of outputting the first control command based on the intake valve temperature of the three-way valve and a preset valve opening temperature threshold value includes:
setting the valve opening temperature threshold as a first temperature threshold, and comparing the valve inlet temperature of the three-way valve with the first temperature threshold to obtain a first temperature correction value;
and performing closed-loop regulation based on the first temperature correction value to output a first control instruction.
12. The control method according to claim 10, wherein the step of outputting the first control command based on the intake valve temperature of the three-way valve and a preset valve opening temperature threshold value includes:
setting the valve opening temperature threshold value to be a temperature interval limited by a second temperature threshold value and a third temperature threshold value, comparing the valve inlet temperature of the three-way valve with the second temperature threshold value to obtain a second temperature correction value, and comparing the valve inlet temperature of the three-way valve with the third temperature threshold value to obtain a third temperature correction value;
and performing closed-loop regulation based on the second temperature correction value and the third temperature correction value to output a first control instruction.
13. The control method according to claim 10, wherein the step of outputting a second control command based on the intake valve temperature of the three-way valve and a preset external radiator temperature threshold value includes:
and comparing the inlet valve temperature of the three-way valve with a preset external radiator temperature threshold value to obtain a fourth temperature correction value, and performing closed-loop regulation to output the external radiator control quantity based on the fourth temperature correction value.
14. The control method according to claims 10 to 13, wherein the step of outputting a second control command based on the intake valve temperature of the three-way valve and a preset external radiator temperature threshold further comprises:
acquiring the current opening degree of the three-way valve;
setting the increment of the control quantity of the external radiator according to the current opening of the three-way valve;
outputting a second control instruction based on the accumulated value of the external radiator control amount and the increment.
15. The control method of claim 14, wherein the external heat sink comprises at least one heat sink fan, and the second control instructions are configured to:
and controlling the starting number and the starting time of the at least one radiating fan when the three-way valve is partially opened.
16. A control device for a cooling cycle device is provided,
the cooling cycle apparatus includes:
the internal circulation loop comprises an internal heat exchange unit and a three-way valve which are connected in a circulating manner;
an outer circulation loop including an external radiator, the outer circulation loop being connected with the inner circulation loop through the three-way valve;
characterized in that the control device comprises:
the acquiring unit is used for acquiring the inlet valve temperature of the three-way valve;
the first control unit is used for outputting a first control instruction based on the inlet valve temperature of a three-way valve and a preset valve opening temperature threshold value, and the first control instruction is used for carrying out closed-loop regulation control on the three-way valve so as to control the flow of the cooling medium in the inner circulation loop and the flow of the cooling medium in the outer circulation loop;
the second control unit is used for outputting a second control instruction based on the inlet valve temperature of the three-way valve and a preset external radiator temperature threshold value, and the second control instruction is used for starting and stopping the external radiator so as to keep the inlet valve temperature of the three-way valve at a preset temperature value;
wherein the valve opening temperature threshold is lower than the external radiator temperature threshold.
17. The control device according to claim 16, wherein the first control unit includes:
the first correction module is used for setting the valve opening temperature threshold value as a first temperature threshold value, comparing the valve inlet temperature of the three-way valve with the first temperature threshold value to obtain a first temperature correction value, and performing closed-loop regulation to output a first control instruction based on the first temperature correction value.
18. The control device according to claim 16, wherein the first control unit includes:
the second correction module is used for setting the valve opening temperature threshold value to be a temperature interval limited by a second temperature threshold value and a third temperature threshold value, comparing the valve inlet temperature of the three-way valve with the second temperature threshold value to obtain a second temperature correction value, comparing the valve inlet temperature of the three-way valve with the third temperature threshold value to obtain a third temperature correction value, and performing closed-loop regulation to output a first control instruction based on the second temperature correction value and the third temperature correction value.
19. The control device according to claim 16, wherein the second control unit includes:
and the third correction module is used for comparing the inlet valve temperature of the three-way valve with a preset external radiator temperature threshold value to obtain a fourth temperature correction value, and performing closed-loop regulation to output the external radiator control quantity based on the fourth temperature correction value.
20. The control device according to claim 19, wherein the second control unit further includes:
and the increment module is used for acquiring the current opening degree of the three-way valve, setting the increment of the control quantity of the external radiator according to the current opening degree of the three-way valve, and outputting a second control instruction based on the control quantity of the external radiator and the accumulated value of the increments.
21. The control device of claim 20, the external heat sink comprising at least one heat sink fan, wherein the second control instructions are configured to:
and controlling the starting number and the starting time of the at least one radiating fan when the three-way valve is partially opened.
22. A computer-readable storage medium, characterized in that a computer program is stored which, when being executed by a processor, implements the control method of any one of claims 10 to 15.
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| CN201910823605.3A CN112449549B (en) | 2019-09-02 | 2019-09-02 | Cooling circulation device, control method and converter |
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| CN201910823605.3A Active CN112449549B (en) | 2019-09-02 | 2019-09-02 | Cooling circulation device, control method and converter |
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| CN113644811A (en) * | 2021-08-06 | 2021-11-12 | 湖南优利泰克自动化系统有限公司 | Control method of cooling fan of wind power converter |
| CN113842206A (en) * | 2021-11-30 | 2021-12-28 | 海杰亚（北京）医疗器械有限公司 | Alcohol recovery method, device and system for cryoablation surgical equipment |
| CN113905594A (en) * | 2021-10-28 | 2022-01-07 | 珠海格力电器股份有限公司 | Heat dissipation control method and device of frequency converter power module, medium and radiator |
| CN114678565A (en) * | 2022-04-21 | 2022-06-28 | 北京亿华通科技股份有限公司 | Control method and driving system of electric control three-way valve in fuel cell thermal management system |
| CN114790951A (en) * | 2022-03-03 | 2022-07-26 | 深圳市燃气集团股份有限公司 | Method for controlling temperature of cylinder sleeve water of gas generator and related device |
| EP4398690A3 (en) * | 2023-01-06 | 2024-09-04 | Delta Electronics Inc. | Heat dissipation system and solid-state transformer power apparatus |
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| CN113644811A (en) * | 2021-08-06 | 2021-11-12 | 湖南优利泰克自动化系统有限公司 | Control method of cooling fan of wind power converter |
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| CN113905594A (en) * | 2021-10-28 | 2022-01-07 | 珠海格力电器股份有限公司 | Heat dissipation control method and device of frequency converter power module, medium and radiator |
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| CN114790951A (en) * | 2022-03-03 | 2022-07-26 | 深圳市燃气集团股份有限公司 | Method for controlling temperature of cylinder sleeve water of gas generator and related device |
| CN114790951B (en) * | 2022-03-03 | 2024-02-13 | 深圳市燃气集团股份有限公司 | Method and related device for controlling cylinder liner water temperature of gas generator |
| CN114678565A (en) * | 2022-04-21 | 2022-06-28 | 北京亿华通科技股份有限公司 | Control method and driving system of electric control three-way valve in fuel cell thermal management system |
| EP4398690A3 (en) * | 2023-01-06 | 2024-09-04 | Delta Electronics Inc. | Heat dissipation system and solid-state transformer power apparatus |
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