CN111587030B - Control method of converter valve cooling system air cooler, electronic equipment and cooling system - Google Patents
Control method of converter valve cooling system air cooler, electronic equipment and cooling system Download PDFInfo
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- CN111587030B CN111587030B CN202010345336.7A CN202010345336A CN111587030B CN 111587030 B CN111587030 B CN 111587030B CN 202010345336 A CN202010345336 A CN 202010345336A CN 111587030 B CN111587030 B CN 111587030B
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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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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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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
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20263—Heat dissipaters releasing heat from coolant
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present application provides a control method for a converter valve cooling system air cooler (air cooler), comprising: collecting operation parameters of a converter valve, and calculating a power loss value Pv of the converter valve by combining the inherent parameters; collecting operation parameters of the air cooler, and calculating heat exchange quantity P of the variable frequency fan unit by combining the inherent parameters 1 And heat exchange quantity P of power frequency fan unit 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the power loss value Pv of the converter valve, the heat exchange quantity P of the variable frequency fan unit of the air cooler 1 And heat exchange quantity P of power frequency fan unit of air cooler 2 And determining the quantity of the variable frequency fan units and the power frequency fan units by combining the heat balance principle of the converter valve cooling system, and obtaining a frequency instruction of the variable frequency fan by a deviation controller through a temperature expected value and a cooling water temperature. The method solves the problem of hysteresis of temperature PI control caused by inertia characteristics of a converter valve and an air cooler heat transfer model and an overlong cooling water pipeline, and improves the dynamic performance of temperature control of a cooling system.
Description
Technical Field
The invention relates to the field of power systems, in particular to a control method for an air cooler of a converter valve cooling system, electronic equipment and a cooling system.
Background
In high-voltage and extra-high voltage direct current transmission engineering, a converter valve is a key device for realizing energy conversion. The thyristor in the converter valve generates very high heat during operation, for which purpose a recirculating cooling system is required to cool it. In the prior art, the cooling system includes circulating cooling water. The cooling water flows through the converter valve, the temperature rises and the generated heat is taken out, and the heat exchange is carried out with an outdoor air cooler (air cooler), so that the temperature of the cooling water is reduced to a reasonable range and flows back to the converter valve again, and a closed internal circulation system of the cooling water is formed.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The control method of the air cooler of the converter valve cooling system solves the problem of hysteresis of temperature PI control caused by inertia characteristics of a converter valve and a heat transfer model of the air cooler and an overlong cooling water pipeline, and improves the dynamic performance of temperature control of the cooling system.
According to one aspect of the application, the control method for the converter valve cooling system air cooler comprises the following steps: collecting operation parameters of a converter valve, and calculating a power loss value Pv of the converter valve by combining the inherent parameters; collecting operation parameters of the air cooler, and calculating heat exchange quantity P of the variable frequency fan unit by combining the inherent parameters 1 And calculating the heat exchange quantity P of the power frequency fan unit 2 Wherein the heat exchange amount P 1 Comprising the following steps: the frequency conversion fan unit operates at the lowest frequency f min Heat exchange quantity P of (2) 1min And the frequency conversion fan unit is at the highest operating frequency f max Heat exchange quantity P of (2) 1max The method comprises the steps of carrying out a first treatment on the surface of the According to the power loss value Pv of the converter valve, the heat exchange quantity P of the variable frequency fan unit of the air cooler 1 And the heat exchange quantity P of the power frequency fan unit of the air cooler 2 And determining the quantity of the variable frequency fan units and the power frequency fan units by combining the heat balance principle of the converter valve cooling system.
According to some embodiments of the present application, the converter valve includes: a grid-based converter valve, and/or a voltage source converter valve.
According to some embodiments of the present application, the collecting the operation parameters of the converter valve includes: and acquiring the operation parameters of the converter valve in real time through a direct current control protection system.
According to some embodiments of the present application, the collecting the operation parameters of the air cooler includes: the air inlet temperature T of the air cooler is acquired by a corresponding sensor w_in Temperature T of air outlet w_out Temperature T of water inlet c_in Temperature T of discharged water c_out 。
According to some embodiments of the present application, the intrinsic parameters include one or more of the following: air specific heat capacity C; heat exchange area a; the heat exchange efficiency epsilon of the power frequency fan unit; the heat exchange air quantity q of the power frequency fan unit; the frequency conversion fan unit operates at the lowest frequency f min Is set to be a heat transfer coefficient K min Air quantity q min The method comprises the steps of carrying out a first treatment on the surface of the The variable frequency fan unit is at the highest operating frequency f max Is set to be a heat transfer coefficient K max Air quantity q max 。
According to some embodiments of the present application, the heat exchange amount P of the variable frequency fan unit is calculated 1 And heat exchange quantity P of power frequency fan unit 2 Comprising: calculated by a logarithmic average temperature difference method or an efficiency-heat exchange unit method (epsilon-NTU) of the heat exchanger.
According to some embodiments of the present application, the air cooler includes: the air cooler is formed by connecting a plurality of air coolers with known heat capacities in parallel; wherein a part of fans of each air cooler with known heat capacity is provided with a frequency converter.
According to some embodiments of the present application, the variable frequency fan unit includes: the small group of variable frequency fans consists of two variable frequency fans of each air cooler; and/or a large group of variable frequency fans, which consists of a plurality of groups of variable frequency fans of the small group at the same position.
According to some embodiments of the present application, the power frequency fan unit includes: the small group of power frequency fans are composed of two power frequency fans of each air cooler; and/or a large group of power frequency fans, which consists of a plurality of groups of small group of power frequency fans at the same position.
According to some embodiments of the present application, determining the number of variable frequency fan units and the power frequency fan units to be put into includes:
according to the formula:
Pv≈N 1 (P 1min +P 1max )/2+N 2 P 2
the sum of the middle value of the upper limit and the lower limit of the heat exchange quantity of the variable frequency fan and the heat exchange quantity of the power frequency fan is closest to the power loss value Pv of the converter valve, and the quantity of the variable frequency fan units and the power frequency fan units is determined under the principle that the variable frequency fan is started preferentially; wherein N is 1 For the frequency conversion fan unit number, N 2 The unit number of the power frequency fan, P 1min At the lowest operating frequency f for the variable frequency fan unit min Heat exchange amount, P 1max For the variable frequency fan unit at the highest operating frequency f max Heat exchange quantity P of (2) 1max 。
According to some embodiments of the present application, further comprising: collecting cooling water data of a converter valve; according to the cooling water data, calculating the frequency f of the variable frequency fan 0 。
According to some embodiments of the application, the cooling water data includes: at least one of inlet valve temperature, outlet valve temperature or outlet water temperature of the air cooler.
According to another aspect of the present application, there is also provided a control device for an air cooler of a converter valve cooling system, including: the acquisition module is used for acquiring the operation parameters of the converter valve and the air coolingOperating parameters of the device; the calculation module is used for calculating the power loss value Pv of the converter valve and the heat exchange quantity P of the variable frequency fan unit according to the collected operation parameters of the converter valve and the air cooler 1 And the heat exchange quantity P of the power frequency fan unit 2 The method comprises the steps of carrying out a first treatment on the surface of the The determining module is used for determining the heat exchange quantity P of the variable-frequency fan unit according to the power loss value Pv of the converter valve 1 And the heat exchange quantity P of the power frequency fan unit 2 And determining the quantity of the variable frequency fan units and the power frequency fan units by combining the heat balance principle of the converter valve cooling system.
According to some embodiments of the application, the collection module is further configured to collect the cooling water data.
According to another aspect of the present application, there is also provided an electronic device, including: a memory for storing one or more programs; one or more processing units, when the one or more programs are executed by the one or more processors, to implement the control methods as described above.
According to another aspect of the present application, there is also provided a converter valve cooling system including: an air cooler; a control device as described above or an electronic device as described above.
According to some embodiments of the present application, further comprising: a bias controller comprising: and the PI controller or the PID controller is used for carrying out deviation adjustment based on the cooling water temperature and a given temperature expected value through the deviation controller to obtain the frequency instruction of the variable frequency fan.
By adopting the control method of the converter valve cooling system air cooler, the calculated value of the converter valve power loss and the heat exchange quantity of the air cooler fan unit are obtained by combining the collected operation parameters with the inherent parameters, the number of groups of the fan units is determined according to the heat balance principle, and meanwhile, the operation frequency of the variable frequency fan can be adjusted through cooling water data. The method is not influenced by inertia and time delay links caused by temperature control of cooling water, is high in instantaneity and outstanding in dynamic performance, reserves enough heat exchange adjustment quantity of the variable-frequency fan to compensate power loss and errors between calculated values and actual values of the heat exchange quantity, dynamically adjusts the running frequency of the variable-frequency fan, finally enables the temperature of the cooling water to be controlled within a reasonable range, and the composite control method not only improves the dynamic performance of temperature control, but also does not influence steady-state precision of the temperature control.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a schematic diagram of the structural principle of an air cooler of a prior art converter valve cooling system;
FIG. 2 is a flow chart of a method of controlling a converter valve cooling system air cooler according to an exemplary embodiment of the present application;
FIG. 3 is a schematic diagram of the structural principles of a converter valve cooling system air cooler according to an exemplary embodiment of the present application;
FIG. 4 is a schematic diagram of operating parameters of a converter valve cooling system air cooler according to an exemplary embodiment of the present application;
FIG. 5 is a schematic diagram of a fan unit of a converter valve cooling system air cooler according to an exemplary embodiment of the present application;
FIG. 6 is a schematic diagram of a control device for a converter valve cooling system air cooler according to an exemplary embodiment of the present application;
fig. 7 is a control apparatus of a converter valve cooling system air cooler according to an exemplary embodiment of the present application.
Reference numerals
101. Control device
103. Air cooler
105. Converter valve
307. DC control protection system
309. Deviation controller
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that the aspects of the application can be practiced without one or more of the specific details, or with other methods, components, materials, apparatus, or steps, etc. In these instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The block diagrams shown in the figures do not necessarily correspond to physically separate entities. The functional entities or parts of the functional entities may be implemented in software, or in one or more hardware modules and/or programmable modules, or in different networks and/or processor devices and/or micro-control devices.
Fig. 1 is a schematic diagram of the structural principle of an air cooler of a prior art converter valve cooling system.
Referring to fig. 1, the cooling system of the converter valve includes a control device 101, an air cooler 103, and a converter valve 105. The control device 101 receives the collected cooling water data and instructs the air cooler 103 to input fan unit groups according to the cooling water data, namely the operation frequency of the variable frequency fans, namely the number and the frequency of the input fans of the air cooler are adjusted along with the load change of the converter valve 105, so that the purpose of controlling the temperature of the cooling water in the cooling system is achieved. On one hand, the heat exchange models of equipment such as a converter valve, an air cooler and the like and cooling water have larger inertia and time delay links, on the other hand, as the rated power of the extra-high voltage direct current converter valve continuously rises, the cooling capacity and the occupied area of a single set of converter valve are larger and larger, the pipeline of an internal circulation system is overlong, the time required for circulating cooling water in the pipeline is longer, if the control delay problem occurs only by the temperature sampling value of the cooling water, the fan of the air cooler is frequently switched when the control delay problem is serious, the fluctuation of the temperature of the cooling water is larger, and the normal operation of the converter valve is endangered, so the control method of the air cooler of the converter valve cooling system has to be improved and developed compared with the defects existing in the prior art.
Fig. 2 is a flowchart of a control method of an air cooler of a converter valve cooling system according to an exemplary embodiment of the present application.
Referring to fig. 2, according to an exemplary embodiment, in S201, an operation parameter of a converter valve is collected, and an operation parameter of an air cooler is collected. The converter valve applicable to the air cooler control method comprises a power grid converter valve or a voltage source converter valve. Wherein the collecting of the operating parameters of the converter valve comprises collecting the operating parameters of the converter valve in real time by means of a dc controller protection system 307, as shown in fig. 3. In addition, the air cooler operation data is acquired by acquiring the air inlet temperature T of the air cooler 103 shown in FIG. 3 through corresponding sensors w_in Temperature T of air outlet w_out Temperature T of water inlet c_in Temperature T of discharged water c_out The operating parameters of the air cooler of the converter valve cooling system of the embodiment shown in fig. 4.
As shown in FIG. 2In S203, the converter valve power loss value Pv is calculated in combination with the intrinsic parameters, and the heat exchange amount P of the variable frequency fan unit is calculated 1 And heat exchange quantity P of power frequency fan unit 2 . The intrinsic parameters comprise both intrinsic parameters of the converter valve and intrinsic parameters of the air cooler, specifically, the operation parameters of the converter valve are obtained through a converter valve data manual or through experiments, the intrinsic parameters of the air cooler comprise air specific heat capacity C, heat exchange area A, heat exchange efficiency epsilon of the power frequency fan unit, heat exchange air quantity q of the power frequency fan unit and the lowest operation frequency f of the variable frequency fan unit min Is set to be a heat transfer coefficient K min Air quantity q min And the variable frequency fan unit is operated at the highest frequency f max Is set to be a heat transfer coefficient K max Air quantity q max . The specific formula is shown in the determination of the loss of the GB/T20989-2017 high-voltage direct current converter station, and the calculation method of the power loss of the converter valve based on the voltage source type converter is shown in the converter valve loss of the voltage source type converter for the GB/T35702.1-2017 high-voltage direct current system.
According to the exemplary embodiment of the present application, the heat exchange amount P of the variable frequency fan unit is calculated by the control device 101 1 And heat exchange quantity P of power frequency fan unit 2 Including by a logarithmic mean temperature difference method or an efficiency-heat exchange unit method (epsilon-NTU) calculation. Specifically, the heat exchange amount P of the air cooler variable frequency fan unit 1 Comprising a variable frequency fan unit at the lowest operating frequency f min And a highest operating frequency f max Heat exchange quantity P of (2) 1min 、P 1max 。
In S203, if the heat exchange amount is calculated according to the logarithmic average temperature difference method of the heat exchanger, the formula is as follows:
P 1min ＝k min AΔT m
P 1max ＝k max AΔT m
P 2 ＝kAΔT m
wherein k is min 、k max The heat transfer coefficients of the variable frequency fan unit at the lowest operating frequency and the highest operating frequency are respectively shown, k is the heat transfer coefficient of the power frequency fan unit, A is the heat transfer area of the fan unit, and delta T is m The formula is as follows, for logarithmic average temperature difference:
in DeltaT max 、ΔT min Respectively (T) w_in -T c_in ) Sum (T) w_out -T c_out ) The larger one and the smaller one of the two.
In addition, in S203, if the heat exchange amount is calculated according to the heat exchanger effectiveness-heat exchange unit (epsilon-NTU), the formula is as follows:
P 1min ＝ε min q min c(T w_in -T c_in )
P 1max ＝ε max q max c(T w_in -T c_in )
P 2 ＝εqc(T w_in -T c_in )
epsilon in min 、ε max And q min 、q max The heat transfer efficiency and the air quantity of the variable frequency fan unit at the lowest operating frequency and the highest operating frequency are respectively shown, epsilon and q are respectively shown as the heat transfer efficiency and the air quantity of the power frequency fan unit, and c is the specific heat capacity of air.
Referring to fig. 2, in S205, the number of variable frequency fans and power frequency fan units to be put into is determined using the heat balance principle, and at the same time, the temperature expected value and the cooling water temperature are subjected to a deviation controller to obtain a frequency command of the variable frequency fan. According to an exemplary embodiment of the present application, the air cooler 103 shown in fig. 3 includes a plurality of air coolers with known heat capacities connected in parallel, wherein each air cooler portion fan is configured with a frequency converter to form a frequency conversion fan. The variable frequency fans comprise a small group of variable frequency fans and a large group of variable frequency fans, 5 air coolers are connected in parallel in fan units of the air coolers of the converter valve cooling system, 14 fans are configured for each air cooler, and 6 of the air coolers are provided with frequency converters, as shown in fig. 5. The small group of variable frequency fans consists of two variable frequency fans in each air cooler, and the large group of variable frequency fans consists of a plurality of groups of small group variable frequency fans at the same position. In addition, the small group of power frequency fans consists of two power frequency fans of each air cooler, and is largeThe group power frequency fans are composed of a plurality of groups of small group power frequency fans at the same position. In this embodiment, the group of variable frequency fans total 15 (n 1m =15) group, a total of 20 (n 1m =20) groups, a total of 3 (N 1m =3) group, total 4 (N) 2max =4) group.
In S205, the control device 101 may be configured to determine the number of the variable frequency fan units and the power frequency fan units, and the calculation formula is as follows:
Pv≈N 1 (P 1min +P 1max )/2+N 2 P 2
wherein N is 1 For the number of variable frequency fan units, N 2 Is the unit number of the power frequency fan, P 1min At the lowest operating frequency f for the variable frequency fan unit min Heat exchange amount, P 1max For the frequency conversion fan unit at the highest operating frequency f max The sum of the middle value of the upper limit and the lower limit of the heat exchange quantity of the variable frequency fan and the heat exchange quantity of the power frequency fan is closest to the power consumption value Pv of the converter valve, and the quantity of the variable frequency fan units and the power frequency fan units is determined under the principle that the variable frequency fan is started preferentially.
Specifically, taking a large group of fans as an air cooler fan unit group as an example, the number N of the variable-frequency fan unit groups 1 The method can be calculated according to the following formula to meet the principle of preferential starting of the variable frequency fan:
wherein N is 1i Is the ideal frequency conversion fan unit group number []To round the symbol.
At the determined frequency conversion fan unit group number N 1 In the case of (2), the number N of the power frequency fan unit groups can be determined by the following calculation method 2 ：
Wherein N is 2i Is an ideal power frequency fan unit group number. In another exemplary embodiment of the present application, the decision principle of using a small group of fans as the air cooler fan unit group is similar to that of a large group of fans, and it should be noted that, in a specific case, the large group and the small group may be matched as the fan unit to be put into use, which is not limited in the present application.
In addition, the control method of the air cooler further comprises the steps of collecting cooling water data of the converter valve, and calculating the frequency f of the variable-frequency fan according to the cooling water data 0 Wherein the cooling water data includes at least one of an inlet valve temperature, an outlet valve temperature, or an outlet water temperature of the air cooler. As shown in fig. 3, the frequency is calculated by a deviation controller 309, which includes a PI controller or a PID controller, for performing deviation adjustment by the acquired cooling water temperature and a given temperature desired value, to obtain a frequency command. For example, a desired temperature value T ref Can be set to 30 ℃, once the controller of the cooling system detects the outlet water temperature T of the air cooler c_out Deviation is generated with the temperature expected value of 30 ℃, the deviation value acts on the PI regulator, and the frequency command value f of the variable frequency fan is changed o Finally, the outlet water temperature T of the air cooler c_out Controlled to 30 ℃.
Fig. 6 is a schematic diagram of a control device of an air cooler of a converter valve cooling system according to an exemplary embodiment of the present application.
Referring to fig. 6, according to an exemplary embodiment, a control apparatus of a converter valve cooling system air cooler includes: the acquisition module 601 is used for acquiring the operation parameters of the converter valve and the operation parameters of the air cooler; the calculation module 602 is configured to calculate a converter valve power loss value Pv and calculate a heat exchange amount P of the variable frequency fan unit according to the collected operation parameters 1 And heat exchange quantity P of power frequency fan unit 2 . And a determining module 603 for frequency converting the fan according to the converter valve power loss PvHeat exchange amount P of unit 1 And heat exchange quantity P of power frequency fan unit 2 And determining the quantity of the variable frequency fan units and the power frequency fan units by combining the heat balance principle of the converter valve cooling system. In addition, the acquisition module can also be used for acquiring data of the cooling water.
Fig. 7 is a control apparatus of a converter valve cooling system air cooler according to an exemplary embodiment of the present application.
An electronic device 200 according to this embodiment of the present application is described below with reference to fig. 7. The electronic device 200 shown in fig. 7 is only an example and should not be construed as limiting the functionality and scope of use of the embodiments herein.
As shown in fig. 7, the electronic device 200 is in the form of a general purpose computing device. The components of the electronic device 200 may include, but are not limited to: at least one processing unit 210, at least one memory unit 220, a bus 230 connecting the different system components (including the memory unit 220 and the processing unit 210), a display unit 240, and the like.
The storage unit 220 stores program codes that can be executed by the processing unit 210, so that the processing unit 210 performs the methods according to the embodiments of the present application described in the present specification.
The storage unit 220 may include readable media in the form of volatile storage units, such as Random Access Memory (RAM) 2201 and/or cache memory 2202, and may further include Read Only Memory (ROM) 2203.
The storage unit 220 may also include a program/utility 2204 having a set (at least one) of program modules 2205, such program modules 2205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
The electronic device 200 may also communicate with one or more external devices 300 (e.g., keyboard, pointing device, bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 200, and/or any device (e.g., router, modem, etc.) that enables the electronic device 200 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 250. Also, the electronic device 200 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through a network adapter 260. Network adapter 260 may communicate with other modules of electronic device 200 via bus 230. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with electronic device 200, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
Embodiments of the present application also provide a computer program product operable to cause a computer to perform some or all of the steps described in the method embodiments above.
Those skilled in the art will clearly understand that the technical solutions of the present application may be implemented by means of software and/or hardware. In this specification, "unit" and "module" refer to software and/or hardware capable of performing a specific function independently or in cooperation with other components, where the hardware may be, for example, a single chip microcomputer, FPGA, PLC, ASIC, etc.
It should be noted that, for the foregoing method embodiments, they are described as a series of operation combinations for simplicity of description, but it should be understood by those skilled in the art that the present application is not limited by the described operation sequence. Certain steps may be performed in other sequences or simultaneously in accordance with the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
From the foregoing detailed description, those skilled in the art will readily appreciate that the technical solutions according to the embodiments of the present application have one or more of the following advantages.
By adopting the control method of the converter valve cooling system air cooler, the converter valve power loss and the fan unit heat exchange quantity calculated value are directly used for obtaining the frequency conversion fan unit group N needing to be input according to the heat balance principle 1 And the number N of the power frequency fan unit groups 2 The method is not influenced by inertia and time delay links caused by temperature control of cooling water, and has high instantaneity and outstanding dynamic performance. In addition, through reasonable frequency conversion fan unit group number N 1 And the number N of the power frequency fan unit groups 2 The decision mechanism reserves enough heat exchange adjustment quantity of the variable frequency fan to compensate the power loss and the error between the calculated value and the actual value of the heat exchange quantity, and the temperature closed-loop PI regulator dynamically adjusts the running frequency of the variable frequency fan, so that the cooling water Wen Duwen is finally fixed in a reasonable range.
The above describes example embodiments of the present application, but is not intended to limit the present application in any way. These exemplary embodiments are not intended to be exhaustive or to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible to one of ordinary skill in the art in light of the above teachings. Therefore, it should be understood by those skilled in the art that the protection scope of the present application is not limited to the specific combination of the above technical features, but also covers other technical solutions formed by any combination of the above technical features or the equivalent thereof without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (16)
1. A control method for a converter valve cooling system air cooler, comprising:
collecting operation parameters of a converter valve, and calculating a power loss value Pv of the converter valve by combining the inherent parameters;
collecting operation parameters of the air cooler, and calculating heat exchange quantity P of the variable frequency fan unit by combining the inherent parameters 1 And calculating the heat exchange quantity P of the power frequency fan unit 2 Wherein the heat exchange amount P 1 Comprising the following steps: the frequency conversion fan unit operates at the lowest frequency f min Heat exchange quantity P of (2) 1min And the frequency conversion fan unit is at the highest operating frequency f max Heat exchange quantity P of (2) 1max ；
According to the power loss value Pv of the converter valve, the heat exchange quantity P of the variable frequency fan unit of the air cooler 1 And the heat exchange quantity P of the power frequency fan unit of the air cooler 2 The method for determining the quantity of the variable frequency fan units and the power frequency fan units by combining the heat balance principle of the converter valve cooling system comprises the following steps:
according to the formula:
Pv≈N 1 (P 1min +P 1max )/2+N 2 P 2
the sum of the intermediate value of the upper limit and the lower limit of the heat exchange quantity of the variable frequency fan and the heat exchange quantity of the power frequency fan is closest to the power loss value Pv of the converter valve, the quantity of the variable frequency fan units and the power frequency fan units is determined under the principle that the variable frequency fan is started preferentially,
wherein N is 1 For the frequency conversion fan unit number, N 2 The unit number of the power frequency fan, P 1min At the lowest operating frequency f for the variable frequency fan unit min Heat exchange amount, P 1max For the variable frequency fan unit at the highest operating frequency f max Heat exchange quantity P of (2) 1max The method comprises the steps of carrying out a first treatment on the surface of the And
and obtaining the frequency instruction of the variable frequency fan unit through a deviation controller by using the temperature expected value and the cooling water temperature.
2. The control method according to claim 1, characterized in that the converter valve includes:
a grid-based converter valve, and/or a voltage source converter valve.
3. The control method according to claim 1, wherein the collecting the operation parameters of the converter valve includes:
and acquiring the operation parameters of the converter valve in real time through a direct current control protection system.
4. The control method according to claim 1, characterized in that the collecting the operation parameters of the air cooler includes:
the air inlet temperature T of the air cooler is acquired by a corresponding sensor w_in Temperature T of air outlet w_out Temperature T of water inlet c_in Temperature T of discharged water c_out 。
5. The control method according to claim 1, characterized in that the intrinsic parameters include one or more of the following parameters:
air specific heat capacity C;
heat exchange area a;
the heat exchange efficiency epsilon of the power frequency fan unit;
the heat exchange air quantity q of the power frequency fan unit;
the frequency conversion fan unit operates at the lowest frequency f min Is set to be a heat transfer coefficient K min Air quantity q min ；
The variable frequency fan unit is at the highest operating frequency f max Is set to be a heat transfer coefficient K max Air quantity q max 。
6. The control method according to claim 1, wherein the heat exchange amount P of the variable frequency fan unit is calculated 1 And heat exchange quantity P of power frequency fan unit 2 Comprising:
calculated by a logarithmic average temperature difference method or an efficiency-heat exchange unit method (epsilon-NTU) of the heat exchanger.
7. The control method according to claim 1, characterized in that the air cooler includes:
the air cooler is formed by connecting a plurality of air coolers with known heat capacities in parallel;
wherein a part of fans of each air cooler with known heat capacity is provided with a frequency converter.
8. The control method according to claim 1, wherein the variable frequency fan unit includes:
the small group of variable frequency fans consists of two variable frequency fans of each air cooler; and/or
The large group of variable frequency fans consists of a plurality of groups of variable frequency fans at the same position.
9. The control method according to claim 1, wherein the power frequency fan unit includes:
the small group of power frequency fans are composed of two power frequency fans of each air cooler; and/or
The large group of power frequency fans consists of a plurality of groups of small group of power frequency fans at the same position.
10. The control method according to claim 1, characterized by further comprising:
collecting cooling water data of a converter valve;
according to the cooling water data, calculating the frequency f of the variable frequency fan 0 。
11. The control method according to claim 10, characterized in that the cooling water data includes:
at least one of inlet valve temperature, outlet valve temperature or outlet water temperature of the air cooler.
12. A control device for a converter valve cooling system air cooler, comprising:
the acquisition module is used for acquiring the operation parameters of the converter valve and the operation parameters of the air cooler;
the calculation module is used for calculating the power loss value Pv of the converter valve and the heat exchange quantity P of the variable frequency fan unit according to the collected operation parameters of the converter valve and the air cooler 1 And heat exchange quantity P of power frequency fan unit 2 ；
The determining module is used for determining the heat exchange quantity P of the variable-frequency fan unit according to the power loss value Pv of the converter valve 1 And the heat exchange quantity P of the power frequency fan unit 2 The method for determining the quantity of the variable frequency fan units and the power frequency fan units by combining the heat balance principle of the converter valve cooling system comprises the following steps:
according to the formula:
Pv≈N 1 (P 1min +P 1max )/2+N 2 P 2
the sum of the intermediate value of the upper limit and the lower limit of the heat exchange quantity of the variable frequency fan and the heat exchange quantity of the power frequency fan is closest to the power loss value Pv of the converter valve, the quantity of the variable frequency fan units and the power frequency fan units is determined under the principle that the variable frequency fan is started preferentially,
wherein N is 1 For the frequency conversion fan unit number, N 2 The unit number of the power frequency fan, P 1min At the lowest operating frequency f for the variable frequency fan unit min Heat exchange amount, P 1max For the variable frequency fan unit at the highest operating frequency f max Heat exchange quantity P of (2) 1max The method comprises the steps of carrying out a first treatment on the surface of the And
and obtaining the frequency instruction of the variable frequency fan unit through a deviation controller by using the temperature expected value and the cooling water temperature.
13. The control device of claim 12, wherein the acquisition module is further configured to acquire cooling water data.
14. An electronic device, comprising:
a memory for storing one or more programs;
one or more processing units, which when executed by the one or more processors, perform the control method of any of claims 1-11.
15. A converter valve cooling system, comprising:
an air cooler;
the control device according to any one of claims 12-13 or the electronic equipment according to claim 14.
16. The converter valve cooling system of claim 15, further comprising:
a bias controller comprising: and the PI controller or the PID controller is used for carrying out deviation adjustment based on the cooling water temperature and a given temperature expected value through the deviation controller to obtain the frequency instruction of the variable frequency fan.
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| CN202010345336.7A CN111587030B (en) | 2020-04-27 | 2020-04-27 | Control method of converter valve cooling system air cooler, electronic equipment and cooling system |
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| CN115577961B (en) * | 2022-10-26 | 2023-09-26 | 南方电网电力科技股份有限公司 | Test and evaluation method for performance of novel sea wind field flexible direct-current power transmission converter system |
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| CN109213221B (en) * | 2017-06-29 | 2022-04-01 | 河南晶锐冷却技术股份有限公司 | Temperature control method of direct-current power transmission converter valve combined type external cooling system |
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