Wind turbine cooling control method and device and ventilation variable frequency cooling system

Abstract

This application provides a cooling control method and apparatus for wind turbine generators and a ventilation-frequency conversion cooling system, relating to the field of wind power generation technology. After obtaining the average output power and average ambient temperature of the target wind turbine generator within a preset time period, this application controls the single centrifugal fan corresponding to the single-fan cooling mode to operate at a first target operating frequency band matching the average output power and average ambient temperature when the ventilation-frequency conversion cooling system is in single-fan cooling mode. When the ventilation-frequency conversion cooling system is in multi-fan cooling mode, it controls multiple centrifugal fans corresponding to the multi-fan cooling mode to operate at a second target operating frequency band matching the average output power and average ambient temperature. This allows the use of the characteristics of the first / second target operating frequency bands, which ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, to achieve a low-frequency centrifugal fan frequency modulation control effect.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and more specifically, to a cooling control method and device for wind turbine generators and a ventilation frequency conversion cooling system. Background Technology

[0002] With the continuous development of science and technology, external rotor generators are widely used in onshore and offshore wind turbines due to their high power generation efficiency and low power generation cost. However, as the power generation capacity of the generator increases, the corresponding heat loss of the generator also increases. It is often necessary to use a ventilation and frequency conversion cooling system composed of multiple centrifugal fans connected in parallel to dissipate heat from the wind turbine to ensure the operating efficiency of the wind turbine.

[0003] Currently, existing ventilation-frequency inverter cooling systems monitor the actual winding temperature of the wind turbine and directly adjust the frequency of the centrifugal fan based on this temperature. This ensures that the actual airflow generated by the centrifugal fan matches the operating conditions of the wind turbine and that the actual winding temperature does not exceed a preset threshold. It's worth noting that this frequency control scheme focuses solely on the actual winding temperature of the wind turbine. Frequent frequency adjustments due to changes in the actual winding temperature can negatively impact the lifespan of the ventilation-frequency inverter cooling system. Furthermore, because temperature sensors cannot be installed on the magnets, it's impossible to effectively monitor whether the magnet temperature exceeds a preset threshold during the centrifugal fan's frequency adjustment control, often resulting in compromised magnet lifespan. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a cooling control method and device for wind turbine units and a ventilation variable frequency cooling system, which can achieve the effect of frequency regulation control of centrifugal fans based on the actual operating conditions of the wind turbine, taking into account the ambient temperature, the actual output power of the wind turbine, the allowable winding temperature and the allowable magnet temperature. Based on the characteristic that the ambient temperature does not change frequently, the frequency regulation control frequency of the centrifugal fans can be effectively reduced, so as to improve the service life and operating efficiency of the wind turbine while effectively improving the service life of the ventilation variable frequency cooling system.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, this application provides a wind turbine cooling control method, applied to a ventilation and frequency conversion cooling system mounted on a target wind turbine, the method comprising:

[0007] Obtain the average output power and average ambient temperature of the target wind turbine within a preset time period;

[0008] Detect whether the current ventilation and cooling mode of the variable frequency cooling system is single-fan cooling mode or multi-fan cooling mode;

[0009] When it is detected that the ventilation and cooling mode is a single-fan cooling mode, a first target operating frequency band that matches the average output power and the average ambient temperature is determined from the pre-stored optimal operating frequency bands of the single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine, which are used to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold. The single centrifugal fan is then controlled to operate according to the first target operating frequency band.

[0010] When it is detected that the ventilation and cooling mode is a multi-fan cooling mode, a second target operating frequency band that matches the average output power and the average ambient temperature is determined from the pre-stored optimal operating frequency bands of multiple centrifugal fans corresponding to the multi-fan cooling mode under different output power and different ambient temperatures to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold. Then, each of the multiple centrifugal fans is controlled to operate according to the second target operating frequency band.

[0011] In an optional implementation, the method further includes:

[0012] Obtain the target air volume-pressure performance curves of the ventilation variable frequency cooling system at different operating frequency bands when a single centrifugal fan is running, and the single fan air volume-pressure performance curves of the ventilation variable frequency cooling system at different operating frequency bands when multiple centrifugal fans are running in parallel.

[0013] A corresponding collaborative operation simulation model is established for the target wind turbine and the ventilation variable frequency cooling system. CFD software is then used to simulate the application of air volume based on the collaborative operation simulation model. The first air volume-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running and the second air volume-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel are obtained.

[0014] Based on the first air volume-pressure working curve and the target air volume-pressure performance curves corresponding to different working frequency bands, the actual air volume values ​​of a single centrifugal fan in different working frequency bands during independent operation are determined. Based on the second air volume-pressure working curve and the single fan air volume-pressure performance curves corresponding to different working frequency bands, the single fan air volume values ​​of the multiple centrifugal fans in different working frequency bands during parallel operation are determined.

[0015] Obtain the heat loss parameters of the target wind turbine at different output powers and the turbine simulation model of the target wind turbine;

[0016] Based on the heat loss parameters of the target wind turbine at different output powers and the actual air volume of a single centrifugal fan at different operating frequency bands during independent operation, with the maximum winding temperature being less than a preset winding temperature threshold and the maximum magnet temperature being less than a preset magnet temperature threshold as constraints, the CFD software is called to perform thermal simulation analysis and calculation on the turbine simulation model according to different ambient temperatures, so as to obtain the optimal operating frequency band of a single centrifugal fan that matches different output powers and different ambient temperatures during independent operation.

[0017] Based on the heat loss parameters of the target wind turbine at different output powers and the air volume of a single centrifugal fan at different operating frequency bands when the multiple centrifugal fans are running in parallel, with the maximum winding temperature being less than a preset winding temperature threshold and the maximum magnet temperature being less than a preset magnet temperature threshold as constraints, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures, so as to obtain the optimal operating frequency band of a single fan that matches different output powers and different ambient temperatures when the multiple centrifugal fans are running in parallel.

[0018] In an optional implementation, the step of calling CFD software to perform airflow application simulation based on the collaborative operation simulation model, and obtaining the first airflow-pressure operating curve of the collaborative operation simulation model when a single centrifugal fan is running, includes:

[0019] Based on multiple preset reference air volume values ​​when a single centrifugal fan operates independently, the CFD software is invoked to simulate the air volume of a single centrifugal fan on the collaborative operation simulation model, thereby obtaining the simulated wind resistance values ​​corresponding to each preset reference air volume value of the collaborative operation simulation model.

[0020] Data fitting was performed on the simulated wind resistance values ​​corresponding to multiple sets of preset reference air volume values ​​to obtain the first air volume-wind pressure working curve of a single centrifugal fan during operation.

[0021] In an optional implementation, the step of calling CFD software to perform airflow application simulation based on the collaborative operation simulation model, and obtaining the second airflow-pressure operating curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel, includes:

[0022] According to the multiple preset single fan air volume values ​​when the multiple centrifugal fans are running in parallel, the CFD software is called to simulate the air volume of the multiple centrifugal fans on the collaborative operation simulation model, so as to obtain the simulated wind resistance value corresponding to each preset single fan air volume value of the collaborative operation simulation model.

[0023] Data fitting is performed on the simulated wind resistance values ​​corresponding to the preset single fan air volume values ​​to obtain the second air volume-wind pressure working curve when the multiple centrifugal fans are running in parallel.

[0024] In an optional implementation, the step of using the CFD software to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures, based on the heat loss parameters of the target wind turbine at different output powers and the actual air volume values ​​of a single centrifugal fan at different operating frequency bands during independent operation, with the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, to obtain the optimal operating frequency band for a single centrifugal fan during independent operation that matches different output powers and different ambient temperatures, includes:

[0025] For each output power, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to the heat loss parameters corresponding to the output power, various ambient temperatures, and the actual air volume value of the single centrifugal fan in different operating frequency bands. The maximum simulated winding temperature and the maximum simulated magnet temperature of the target wind turbine unit at different ambient temperatures under the action of the actual air volume value applied by the single centrifugal fan in different operating frequency bands when running at the output power.

[0026] For each ambient temperature, the maximum simulated winding temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold, and the maximum simulated magnet temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold.

[0027] From multiple operating frequency bands that match the ambient temperature and output power, where the maximum simulated winding temperature is less than the preset winding temperature threshold and the maximum simulated magnet temperature is less than the preset winding temperature threshold, the target operating frequency band with the smallest lower frequency limit is selected as the optimal operating frequency band for the single centrifugal fan that matches the ambient temperature and output power.

[0028] In an optional implementation, the step of using the CFD software to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures, based on the heat loss parameters of the target wind turbine at different output powers and the single-fan air volume values ​​of the multiple centrifugal fans operating in parallel at different operating frequency bands, with the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, to obtain the optimal operating frequency band of the single fan matching different output powers and different ambient temperatures when the multiple centrifugal fans are operating in parallel, includes:

[0029] For each output power, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to the heat loss parameters corresponding to the output power, various ambient temperatures, and the single fan air volume values ​​of the multiple centrifugal fans in different operating frequency bands. The maximum simulated winding temperature and maximum simulated magnet temperature of the target wind turbine unit at different ambient temperatures under the action of the single fan air volume values ​​applied by the multiple centrifugal fans in different operating frequency bands when running at the output power are obtained.

[0030] For each ambient temperature, the maximum simulated winding temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold, and the maximum simulated magnet temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold.

[0031] From multiple operating frequency bands that match the ambient temperature and output power, where the maximum simulated winding temperature is less than the preset winding temperature threshold and the maximum simulated magnet temperature is less than the preset winding temperature threshold, the target operating frequency band with the smallest lower frequency limit is selected as the optimal operating frequency band for a single centrifugal fan that matches the ambient temperature and output power.

[0032] In an optional implementation, the step of detecting whether the current ventilation and cooling mode of the variable frequency cooling system is a single-fan cooling mode or a multi-fan cooling mode includes:

[0033] Check whether each of the multiple centrifugal fans in the ventilation variable frequency cooling system has an operational fault;

[0034] If only one centrifugal fan is found to be functioning properly, it is determined that the current ventilation and cooling mode of the variable frequency cooling system is single-fan cooling mode.

[0035] If at least two centrifugal fans are found to be free of operational faults, the current ventilation and cooling mode of the variable frequency cooling system is determined to be the multi-fan cooling mode.

[0036] Secondly, this application provides a wind turbine cooling control device, applied to a ventilation and frequency conversion cooling system mounted on a target wind turbine, the device comprising:

[0037] The unit operation status acquisition module is used to acquire the average output power and average ambient temperature of the target wind turbine unit within a preset time period.

[0038] The ventilation and cooling mode detection module is used to detect whether the current ventilation and cooling mode of the variable frequency cooling system is a single fan cooling mode or a multi-fan cooling mode.

[0039] A single-fan cooling control module is used to, when detecting that the ventilation and cooling mode is a single-fan cooling mode, determine a first target operating frequency band that matches the average output power and the average ambient temperature from the pre-stored optimal operating frequency bands of a single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine, which are used to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and control the operation of the single centrifugal fan according to the first target operating frequency band;

[0040] The multi-fan cooling control module is used to, when detecting that the ventilation and cooling mode is a multi-fan cooling mode, determine a second target operating frequency band that matches the average output power and the average ambient temperature from the pre-stored optimal operating frequency bands of multiple centrifugal fans corresponding to the multi-fan cooling mode under different output power and different ambient temperatures to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and control each of the multiple centrifugal fans to operate according to the second target operating frequency band.

[0041] In an optional embodiment, the apparatus further includes:

[0042] The fan performance curve acquisition module is used to acquire the target air volume-pressure performance curves of the ventilation frequency conversion cooling system at different operating frequency bands when a single centrifugal fan is running, and the single fan air volume-pressure performance curves of the ventilation frequency conversion cooling system at different operating frequency bands when multiple centrifugal fans are running in parallel.

[0043] The collaborative operation curve simulation module is used to establish a corresponding collaborative operation simulation model for the target wind turbine and the ventilation frequency conversion cooling system, and call CFD software to simulate the application of air volume based on the collaborative operation simulation model to obtain the first air volume-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running and the second air volume-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel.

[0044] The working frequency band air volume determination module is used to determine the actual air volume value of a single centrifugal fan in different working frequency bands when it is running independently, based on the first air volume-pressure working curve and the target air volume-pressure performance curves corresponding to different working frequency bands, and to determine the single fan air volume value of the multiple centrifugal fans in different working frequency bands when they are running in parallel, based on the second air volume-pressure working curve and the single fan air volume-pressure performance curves corresponding to different working frequency bands.

[0045] The unit-related data acquisition module is used to acquire the heat loss parameters of the target wind turbine under different output powers and the unit simulation model of the target wind turbine.

[0046] The single-fan thermal simulation analysis module is used to perform thermal simulation analysis and calculation on the simulation model of the unit according to different ambient temperatures based on the heat loss parameters of the target wind turbine unit under different output powers and the actual air volume values ​​of a single centrifugal fan in different operating frequency bands when running independently. The module uses the constraint that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold to call the CFD software to perform thermal simulation analysis and calculation on the unit simulation model under different ambient temperatures, so as to obtain the optimal operating frequency band of a single centrifugal fan that matches different output powers and different ambient temperatures when running independently.

[0047] The multi-fan thermal simulation analysis module is used to perform thermal simulation analysis and calculation on the simulation model of the unit under different ambient temperatures based on the heat loss parameters of the target wind turbine unit under different output powers and the air volume values ​​of the single fan in different operating frequency bands when the multiple centrifugal fans are running in parallel. With the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, the module calls the CFD software to perform thermal simulation analysis and calculation on the unit simulation model under different ambient temperatures to obtain the optimal operating frequency band of the single fan that matches the different output powers and different ambient temperatures when the multiple centrifugal fans are running in parallel.

[0048] Thirdly, this application provides a ventilation frequency conversion cooling system, which is installed on a target wind turbine. The ventilation frequency conversion cooling system includes a main control unit and multiple centrifugal fans, wherein the main control unit is communicatively connected to the multiple centrifugal fans and is used to regulate the actual operating frequency band of each centrifugal fan so that each centrifugal fan can cool the target wind turbine.

[0049] The main control unit includes a processor and a memory. The memory stores a computer program that can be executed by the processor. The processor can execute the computer program to implement the wind turbine cooling control method described in any of the foregoing embodiments.

[0050] In this case, the beneficial effects of the embodiments of this application may include the following:

[0051] After obtaining the average output power and average ambient temperature of the target wind turbine within a preset time period, this application, when the ventilation variable frequency cooling system is in single-fan cooling mode, determines a first target operating frequency band that matches the average output power and average ambient temperature from the pre-stored optimal operating frequency bands of a single centrifugal fan corresponding to the single-fan cooling mode under different output power and ambient temperature conditions of the target wind turbine. The single centrifugal fan is then controlled to operate according to the first target operating frequency band. Furthermore, when the ventilation variable frequency cooling system is in multi-fan cooling mode, it determines the first target operating frequency band that matches the average output power and average ambient temperature from the pre-stored optimal operating frequency bands of multiple centrifugal fans corresponding to the multi-fan cooling mode under different output power and ambient temperature conditions. The system uses a second target operating frequency band to match the ambient temperature, and controls the operation of each centrifugal fan in multiple centrifugal fans according to this second target operating frequency band. This allows the system to utilize the optimal operating frequency band or the optimal operating frequency band for a single fan to ensure that the maximum winding temperature is less than the preset winding temperature threshold and the maximum magnet temperature is less than the preset magnet temperature threshold. Based on the actual fan operation of the ventilation frequency conversion cooling system, the system comprehensively considers the ambient temperature, the actual output power of the wind turbine, the allowable winding temperature, and the allowable magnet temperature to achieve the centrifugal fan frequency modulation control effect. Furthermore, based on the characteristic that the ambient temperature does not change frequently, the system effectively reduces the frequency modulation control frequency of the centrifugal fans, thereby improving the service life and operating efficiency of the wind turbine while effectively extending the service life of the ventilation frequency conversion cooling system.

[0052] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the deployment of the ventilation variable frequency cooling system provided in the embodiments of this application;

[0055] Figure 2 for Figure 1 A schematic diagram of the main control unit in the diagram;

[0056] Figure 3 This is one of the flowcharts illustrating the wind turbine cooling control method provided in this application embodiment;

[0057] Figure 4A second schematic flowchart of the wind turbine cooling control method provided in this application embodiment;

[0058] Figure 5 This is one of the schematic diagrams of the wind turbine cooling control device provided in the embodiments of this application;

[0059] Figure 6 This is a second schematic diagram of the composition of the wind turbine cooling control device provided in the embodiments of this application.

[0060] Icons: 10-Ventilation and frequency conversion cooling system; 11-Centrifugal fan; 12-Main control unit; 121-Memory; 122-Processor; 123-Communication unit; 100-Wind turbine cooling control device; 110-Unit operation status acquisition module; 120-Ventilation and cooling mode detection module; 130-Single fan cooling control module; 140-Multi-fan cooling control module; 150-Fan performance curve acquisition module; 160-Collaborative working curve simulation module; 170-Operating frequency band airflow determination module; 180-Unit related data acquisition module; 190-Single fan thermal simulation analysis module; 1110-Multi-fan thermal simulation analysis module. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0062] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0063] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0064] In the description of this application, it should be understood that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0067] Please refer to Figure 1 , Figure 1This is a schematic diagram of the deployment of the ventilation variable frequency cooling system 10 provided in this application embodiment. In this application embodiment, the ventilation variable frequency cooling system 10 may include multiple centrifugal fans 11 and a main control unit 12. The total number of centrifugal fans in the ventilation variable frequency cooling system 10 is at least two, wherein each centrifugal fan 11 is connected to the air outlet of the target wind turbine unit via a duct to draw air from the target wind turbine unit and the duct, and discharges the drawn air to the external environment after pressurization; the main control unit 12 is communicatively connected to the multiple centrifugal fans 11 via a frequency converter, and is used to control the actual operating frequency band of each centrifugal fan 11 via the frequency converter, so that each centrifugal fan 11 cools the target wind turbine unit respectively, wherein each frequency converter corresponds to one centrifugal fan 11, and the total number of frequency converters in the ventilation variable frequency cooling system 10 is consistent with the total number of centrifugal fans. The main control unit 12 may be, but is not limited to, a tablet computer, a laptop computer, a personal computer, etc.; each centrifugal fan 11 operates at its corresponding minimum operating frequency when it starts running.

[0068] Please refer to Figure 2 , Figure 2 yes Figure 1 A schematic diagram of the main control unit 12 is shown. In this embodiment, the main control unit 12 may include a memory 121, a processor 122, a communication unit 123, and a wind turbine cooling control device 100. The memory 121, the processor 122, and the communication unit 123 are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected through one or more communication buses or signal lines.

[0069] In this embodiment, the memory 121 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc. The memory 121 is used to store computer programs, and the processor 122 can execute the computer programs accordingly after receiving execution instructions.

[0070] The memory 121 is also used to store the optimal operating frequency band of a single centrifugal fan 11 under different output power and different ambient temperatures of the target wind turbine when the single centrifugal fan 11 operates independently, so that the single centrifugal fan 11 can operate at the corresponding optimal operating frequency band when the target wind turbine maintains the corresponding output power and corresponding ambient temperature, thereby ensuring that the maximum winding temperature of the target wind turbine under the influence of the corresponding output power and corresponding ambient temperature is less than a preset winding temperature threshold, and ensuring that the maximum magnet temperature of the target wind turbine under the influence of the corresponding output power and corresponding ambient temperature is less than a preset magnet temperature threshold.

[0071] The memory 121 is also used to store the optimal operating frequency band of a single centrifugal fan 11 under different output power and different ambient temperatures of the target wind turbine when multiple centrifugal fans 11 are connected in parallel. This ensures that each centrifugal fan 11 operates according to its corresponding optimal operating frequency band when the target wind turbine maintains the corresponding output power and ambient temperature. This guarantees that the maximum winding temperature of the target wind turbine under the influence of the corresponding output power and ambient temperature is less than a preset winding temperature threshold, and that the maximum magnet temperature of the target wind turbine under the influence of the corresponding output power and ambient temperature is less than a preset magnet temperature threshold. The total number of centrifugal fans 11 can be 2, 3, or 4. Different total numbers of centrifugal fans 11 will result in different optimal operating frequency bands for each fan, matching different output power and ambient temperatures. For example, the optimal operating frequency band of a single centrifugal fan 11 with a total of 2 fans, which is matched with a specific output power A and a specific ambient temperature B, can be M1, while the optimal operating frequency band of a single centrifugal fan 11 with a total of 4 fans, which is matched with a specific output power A and a specific ambient temperature B, can be M2.

[0072] In this embodiment, the processor 122 can be an integrated circuit chip with signal processing capabilities. The processor 122 can be a general-purpose processor, including at least one of a Central Processing Unit (CPU), Graphics Processing Unit (GPU), Network Processor (NP), Digital Signal Processor (DSP), Application-Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in this embodiment.

[0073] In this embodiment, the communication unit 123 is used to establish a communication connection between the main control unit 12 and other electronic devices via a network, and to send and receive data via the network, wherein the network includes wired communication networks and wireless communication networks. For example, the main control unit 12 can communicate with multiple centrifugal fans 11 via the communication unit 123 through a frequency converter to control the actual operating frequency band of each centrifugal fan 11; the main control unit 12 can obtain the corresponding output power from the target wind turbine in real time through the communication unit 123, and obtain the corresponding ambient temperature from a temperature sensor located outside the nacelle of the target wind turbine through the communication unit 123.

[0074] In this embodiment, the wind turbine cooling control device 100 may include at least one software function module that can be stored in the memory 121 in the form of software or firmware or embedded in the operating system of the main control unit 12. The processor 122 can be used to execute the executable modules stored in the memory 121, such as the software function modules and computer programs included in the wind turbine cooling control device 100. The main control unit 12 can achieve the centrifugal fan frequency regulation control effect by the wind turbine cooling control device 100 based on the actual wind turbine operating status of the ventilation frequency conversion cooling system 10, comprehensively considering the ambient temperature, the actual output power of the wind turbine, the allowable winding temperature (i.e., the preset winding temperature threshold), and the allowable magnet temperature (i.e., the preset magnet temperature threshold). Based on the characteristic that the ambient temperature does not change frequently, the frequency regulation control frequency of the centrifugal fan is effectively reduced, so as to improve the service life and operating efficiency of the wind turbine and the service life of the ventilation frequency conversion cooling system.

[0075] Understandable Figure 2 The block diagram shown is only a schematic diagram of one composition of the main control unit 12. The main control unit 12 may also include... Figure 2 The more or fewer components shown, or having the same Figure 2 The different configurations shown. Figure 2 The components shown can be implemented using hardware, software, or a combination thereof.

[0076] In this application, to ensure that the ventilation variable frequency cooling system 10 can achieve centrifugal fan frequency regulation control based on the actual fan operating conditions, comprehensively considering the ambient temperature, the actual output power of the wind turbine, the allowable winding temperature, and the allowable magnet temperature, and effectively reduce the centrifugal fan frequency regulation control frequency, thereby improving the service life and operating efficiency of the wind turbine while effectively extending the service life of the ventilation variable frequency cooling system, this application provides a wind turbine cooling control method applied to the main control unit 12 in the aforementioned ventilation variable frequency cooling system 10 to achieve the aforementioned objective. The wind turbine cooling control method provided in this application will be described in detail below.

[0077] Please refer to Figure 3 , Figure 3 This is one of the flowcharts illustrating the wind turbine cooling control method provided in this application embodiment. In this application embodiment, the wind turbine cooling control method may include steps S210 to S240.

[0078] Step S210: Obtain the average output power and average ambient temperature of the target wind turbine unit within a preset time period.

[0079] In this embodiment, the main control unit 12 can acquire the corresponding output power and corresponding ambient temperature from the target wind turbine at preset time intervals. Then, it extracts all target output power of the target wind turbine within a preset time period, with the current time as the upper limit, from the acquired historical output power. By averaging all the acquired target output power, it obtains the average output power of the target wind turbine within the preset time period. Simultaneously, it can extract all target ambient temperatures of the target wind turbine within a preset time period, with the current time as the upper limit, from the acquired historical ambient temperatures. By averaging all the acquired target ambient temperatures, it obtains the average ambient temperature of the target wind turbine within the preset time period. The preset time period can be 30 seconds, 1 minute, or 2 minutes, and the specific time period length can be set differently according to the wind turbine's frequency regulation accuracy requirements. The preset time interval can be 2 seconds or 3 seconds, and the time period length is a positive integer multiple of the preset time interval.

[0080] Step S220: Detect whether the current ventilation and cooling mode of the variable frequency cooling system is single-fan cooling mode or multi-fan cooling mode.

[0081] In this embodiment, the main control unit 12 in the ventilation variable frequency cooling system 10 can determine whether the current ventilation cooling mode of the ventilation variable frequency cooling system 10 is a single-fan cooling mode or a multi-fan cooling mode by detecting whether each centrifugal fan 11 in the ventilation variable frequency cooling system 10 is operating normally. The single-fan cooling mode indicates that the ventilation variable frequency cooling system 10 is currently cooling the target wind turbine using only a single, normally operating centrifugal fan 11. The multi-fan cooling mode indicates that the ventilation variable frequency cooling system 10 is currently cooling the target wind turbine using multiple normally operating centrifugal fans 11 connected in parallel. The total number of centrifugal fans 11 involved in the multi-fan cooling mode can be 2 or 3, with each total number of fans greater than 1 corresponding to a separate multi-fan cooling mode.

[0082] Optionally, the step of detecting whether the current ventilation and cooling mode of the variable frequency cooling system 10 is a single-fan cooling mode or a multi-fan cooling mode may include:

[0083] Check whether each of the multiple centrifugal fans 11 in the ventilation variable frequency cooling system 10 has an operational fault;

[0084] If it is detected that only one centrifugal fan 11 is not malfunctioning, it is determined that the current ventilation and cooling mode of the ventilation frequency conversion cooling system 10 is the single-fan cooling mode.

[0085] If at least two centrifugal fans 11 are found to be free of operational faults, the current ventilation and cooling mode of the variable frequency cooling system 10 is determined to be the multi-fan cooling mode.

[0086] Therefore, this application can effectively detect the current actual fan operation status of the ventilation frequency conversion cooling system 10 by executing the specific steps of step S220 above.

[0087] Step S230: When it is detected that the ventilation and cooling mode is the single-fan cooling mode, a first target operating frequency band that matches the average output power and average ambient temperature is determined from the pre-stored optimal operating frequency bands of a single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine, which are used to ensure that the maximum winding temperature is less than the preset winding temperature threshold and the maximum magnet temperature is less than the preset magnet temperature threshold. The single centrifugal fan is then controlled to operate according to the first target operating frequency band.

[0088] In this embodiment, when the ventilation frequency conversion cooling system 10 can only cool the target wind turbine unit through one centrifugal fan 11, the main control unit 12 will select a first target operating frequency band that matches the average output power and the average ambient temperature from the stored optimal operating frequency bands of a single centrifugal fan 11 operating independently under different output power and different ambient temperatures of the target wind turbine unit. The main control unit 12 will then control the centrifugal fan 11 currently operating normally according to the first target operating frequency band, so that the maximum winding temperature of the target wind turbine unit currently operating under the action of the centrifugal fan 11 operating according to the first target operating frequency band does not exceed the allowable winding temperature, and the maximum magnet temperature of the target wind turbine unit currently operating under the action of the centrifugal fan 11 operating according to the first target operating frequency band does not exceed the allowable magnet temperature.

[0089] Step S240: When it is detected that the ventilation and cooling mode is the multi-fan cooling mode, a second target operating frequency band that matches the average output power and average ambient temperature is determined from the pre-stored optimal operating frequency bands of the centrifugal fans corresponding to the multi-fan cooling mode under different output power and different ambient temperatures to ensure that the maximum winding temperature is less than the preset winding temperature threshold and the maximum magnet temperature is less than the preset magnet temperature threshold. Each centrifugal fan is controlled to operate according to the second target operating frequency band.

[0090] In this embodiment, when the ventilation variable frequency cooling system 10 can cool the target wind turbine unit through multiple normally operating centrifugal fans 11 connected in parallel, the main control unit 12 will, based on the total number of target wind turbines among the multiple normally operating centrifugal fans 11, select the target single-fan optimal operating frequency bands corresponding to the total number of target wind turbines, from the stored optimal operating frequency bands of multiple centrifugal fans 11 operating in parallel under different output power and different ambient temperatures of the target wind turbine unit. The system first determines the operating frequency band, and then selects a second target operating frequency band that matches the average output power and average ambient temperature from the optimal operating frequency bands of the target single fan corresponding to different output power and different ambient temperatures. Then, it controls the multiple normally operating centrifugal fans 11 to operate according to the second target operating frequency band, so that the maximum winding temperature of the target wind turbine under the action of the multiple centrifugal fans 11 operating according to the second target operating frequency band can not exceed the allowable winding temperature, and the maximum magnet temperature of the target wind turbine under the action of the multiple centrifugal fans 11 operating according to the second target operating frequency band can not exceed the allowable magnet temperature.

[0091] Therefore, by executing the above steps S210 to S240, this application can utilize the characteristics that the optimal operating frequency band of a single fan operating independently or the optimal operating frequency band of a single fan operating in parallel with multiple fans can ensure that the maximum winding temperature is less than the preset winding temperature threshold and the maximum magnet temperature is less than the preset magnet temperature threshold. Based on the actual fan operation status of the ventilation frequency conversion cooling system 10, and comprehensively considering the ambient temperature, the actual output power of the wind turbine, the allowable winding temperature, and the allowable magnet temperature, the centrifugal fan frequency modulation control effect can be achieved. Based on the characteristic that the ambient temperature does not change frequently, the frequency modulation control frequency of the centrifugal fan can be effectively reduced, thereby improving the service life and operating efficiency of the wind turbine while effectively extending the service life of the ventilation frequency conversion cooling system.

[0092] Alternatively, please refer to Figure 4 , Figure 4 This is the second schematic flowchart of the wind turbine cooling control method provided in this application embodiment. In this application embodiment, with Figure 3 Compared to the wind turbine cooling control method shown, Figure 4 The wind turbine cooling control method shown may also include steps S250 to S2110 to effectively determine the optimal operating frequency band of the ventilation frequency conversion cooling system 10 when the single fan operates independently under different output power and different ambient temperatures of the target wind turbine, and the optimal operating frequency band of the single fan when multiple fans are connected in parallel with different total number of fans.

[0093] Step S250: Obtain the target air volume-pressure performance curves of the ventilation variable frequency cooling system at different operating frequency bands when a single centrifugal fan is running, and the single fan air volume-pressure performance curves of the ventilation variable frequency cooling system at different operating frequency bands when multiple centrifugal fans are running in parallel.

[0094] In this embodiment, the target airflow-pressure performance curve is used to describe the correlation between the airflow and pressure values ​​applied to the target wind turbine unit by a single centrifugal fan 11 when it operates independently at the corresponding operating frequency band. The single-fan airflow-pressure performance curve is used to describe the correlation between the airflow and pressure values ​​applied to the target wind turbine unit by each centrifugal fan 11 when multiple centrifugal fans 11 of a specific total number of fans operate in parallel at the corresponding operating frequency band. The specific total number of fans is used to characterize the total number of multiple centrifugal fans 11 participating in the parallel cooling process.

[0095] If the total number of centrifugal fans deployed in the ventilation frequency conversion cooling system 10 is greater than 1 (N), then the ventilation frequency conversion cooling system 10 can have (N-1) multi-fan cooling modes with multiple fans operating in parallel. Each multi-fan cooling mode corresponds to a single total number of fans (i.e., 1, ..., N-1). At this time, the main control unit 12 will obtain the single fan air volume-pressure performance curves of multiple centrifugal fans 11 operating in parallel at different operating frequency bands for each of the different total number of fans (i.e., 2, ..., N). For example, if the total number of centrifugal fans deployed in the ventilation frequency conversion cooling system 10 is 3, then the ventilation frequency conversion cooling system 10 can have two multi-fan cooling modes (i.e., a multi-fan cooling mode with a total of 2 fans and a multi-fan cooling mode with a total of 3 fans). At this time, the main control unit 12 will correspondingly acquire the single fan air volume-pressure performance curves of multiple centrifugal fans 11 with a total of 2 fans running in parallel at different operating frequency bands, and the single fan air volume-pressure performance curves of multiple centrifugal fans 11 with a total of 3 fans running in parallel at different operating frequency bands.

[0096] Step S260: Establish a corresponding collaborative operation simulation model for the target wind turbine and the ventilation variable frequency cooling system, and call CFD software to simulate the application of air volume based on the collaborative operation simulation model to obtain the first air volume-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running and the second air volume-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel.

[0097] In this embodiment, after obtaining the collaborative operation simulation model characterizing the coordinated operation of the target wind turbine and the ventilation frequency conversion cooling system 10, the main control unit 12 can call the CFD (Computational Fluid Dynamics) software to simulate the airflow application of the collaborative operation simulation model for the single-fan cooling mode and the multi-fan cooling mode corresponding to different total numbers of fans, respectively, to obtain the first airflow-pressure working curve of the collaborative operation simulation model when a single centrifugal fan 11 is running independently, and the second airflow-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans 11 are connected in parallel with different total numbers of fans. The first air volume-pressure working curve describes the relationship between the air volume and pressure values ​​output by the single centrifugal fan 11 to the external environment when the target wind turbine unit works in conjunction with a single centrifugal fan 11. The second air volume-pressure working curve describes the relationship between the air volume and pressure values ​​output by the multiple centrifugal fans 11 to the external environment when the target wind turbine unit works in conjunction with multiple centrifugal fans 11 corresponding to a specific total number of wind turbines.

[0098] Optionally, in this embodiment, for the single-fan cooling mode, the step "calling CFD software to simulate the application of airflow based on the collaborative operation simulation model, and obtaining the first airflow-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running" in step S260 may include:

[0099] Based on multiple preset reference air volume values ​​for the independent operation of a single centrifugal fan 11, the CFD software is invoked to simulate the air volume of a single centrifugal fan 11 on the collaborative operation simulation model, thereby obtaining the simulated wind resistance values ​​corresponding to each preset reference air volume value of the collaborative operation simulation model.

[0100] Data fitting was performed on the simulated wind resistance values ​​corresponding to multiple sets of preset reference air volume values ​​to obtain the first air volume-wind pressure working curve of a single centrifugal fan 11 during operation.

[0101] The number of preset reference airflow value groups can be any one of 4 to 6. The main control unit 12 can effectively determine the first airflow-pressure working curve of the single centrifugal fan 11 of the ventilation frequency conversion cooling system 10 when it works in conjunction with the target wind turbine by executing the specific steps in step S260 corresponding to the single fan cooling mode.

[0102] Optionally, in this embodiment, for any target multi-fan cooling mode among the multi-fan cooling modes corresponding to different total numbers of fans, the step "calling CFD software to simulate the application of airflow based on the collaborative operation simulation model, and obtaining the second airflow-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel" in step S260 may include:

[0103] According to multiple preset single fan air volume values ​​when multiple centrifugal fans 11 are running in parallel, the CFD software is called to simulate the air volume of the multiple centrifugal fans 11 on the collaborative operation simulation model, and the simulated wind resistance value corresponding to each preset single fan air volume value of the collaborative operation simulation model is obtained.

[0104] Data fitting is performed on the simulated wind resistance values ​​corresponding to the preset single fan air volume values ​​to obtain the second air volume-wind pressure working curve when the multiple centrifugal fans 11 are running in parallel.

[0105] The number of preset single-fan airflow value groups can be any one of 4 to 6, and the total number of centrifugal fans 11 corresponds to the target multi-fan cooling mode. The main control unit 12 can effectively determine the second airflow-pressure working curve of the ventilation frequency conversion cooling system 10 when multiple centrifugal fans 11 corresponding to the multi-fan cooling mode work in coordination with the target wind turbine by executing the specific steps in step S260 corresponding to the multi-fan cooling mode.

[0106] Step S270: Based on the first air volume-pressure working curve and the target air volume-pressure performance curves corresponding to different working frequency bands, determine the actual air volume value of a single centrifugal fan in different working frequency bands when operating independently. Based on the second air volume-pressure working curve and the single fan air volume-pressure performance curves corresponding to different working frequency bands, determine the single fan air volume value of multiple centrifugal fans in different working frequency bands when operating in parallel.

[0107] In this embodiment, for the single-fan cooling mode, the main control unit 12 can perform intersection analysis on the first airflow-pressure working curve and the target airflow-pressure performance curve of each working frequency band to obtain the intersection airflow value between the first airflow-pressure working curve and the target airflow-pressure performance curve of that working frequency band. Then, the intersection airflow value corresponding to that working frequency band is used as the actual airflow value of a single centrifugal fan 11 when it runs independently according to that working frequency band.

[0108] For any target multi-fan cooling mode among the multi-fan cooling modes corresponding to different total numbers of fans, the main control unit 12 can perform intersection analysis on the second air volume-pressure working curve corresponding to the target multi-fan cooling mode and the single fan air volume-pressure performance curve of each working frequency band to obtain the intersection air volume value between the second air volume-pressure working curve corresponding to the target multi-fan cooling mode and the single fan air volume-pressure performance curve of that working frequency band. Then, the intersection air volume value corresponding to that working frequency band is used as the single fan air volume value of each centrifugal fan 11 when multiple centrifugal fans 11 corresponding to the target multi-fan cooling mode are running in parallel according to that working frequency band.

[0109] Step S280: Obtain the heat loss parameters of the target wind turbine under different output powers and the turbine simulation model of the target wind turbine.

[0110] In this embodiment, the heat loss parameters may include the copper heat loss value, iron heat loss value, and permanent magnet heat loss value of the target wind turbine at the corresponding output power.

[0111] Step S290: Based on the heat loss parameters of the target wind turbine unit under different output powers and the actual air volume values ​​of a single centrifugal fan in different operating frequency bands during independent operation, with the maximum winding temperature being less than a preset winding temperature threshold and the maximum magnet temperature being less than a preset magnet temperature threshold as constraints, CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures to obtain the optimal operating frequency band of a single centrifugal fan that matches different output powers and different ambient temperatures during independent operation.

[0112] In this embodiment, for the single-fan cooling mode, step S290 may include:

[0113] For each output power, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to the heat loss parameters corresponding to the output power, various ambient temperatures, and the actual air volume value of the single centrifugal fan 11 in different operating frequency bands. The maximum simulated winding temperature and the maximum simulated magnet temperature of the target wind turbine unit at different ambient temperatures under the action of the actual air volume value applied by the single centrifugal fan 11 in different operating frequency bands when running at the output power are obtained.

[0114] For each ambient temperature, the maximum simulated winding temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold, and the maximum simulated magnet temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold.

[0115] From multiple operating frequency bands that match the ambient temperature and the output power, where the maximum simulated winding temperature is less than the preset winding temperature threshold and the maximum simulated magnet temperature is less than the preset winding temperature threshold, the target operating frequency band with the smallest lower frequency limit is selected as the optimal operating frequency band for the single centrifugal fan 11 that matches the ambient temperature and the output power.

[0116] Therefore, by executing the specific steps of step S290 above, this application can effectively determine the optimal operating frequency band of the ventilation frequency conversion cooling system 10 when the single fan is running independently under different output power and different ambient temperatures of the target wind turbine.

[0117] Step S2110: Based on the heat loss parameters of the target wind turbine unit under different output powers and the single-fan air volume values ​​of the multiple centrifugal fans operating in parallel at different operating frequency bands, with the maximum winding temperature being less than a preset winding temperature threshold and the maximum magnet temperature being less than a preset magnet temperature threshold as constraints, CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures to obtain the optimal operating frequency band of the single fan matching different output powers and different ambient temperatures when multiple centrifugal fans are operating in parallel.

[0118] In this embodiment, for any target multi-fan cooling mode among the multi-fan cooling modes corresponding to different total numbers of fans, step S2110 may include:

[0119] For each output power, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to the heat loss parameters corresponding to the output power, various ambient temperatures, and the single fan air volume values ​​of the multiple centrifugal fans 11 in different operating frequency bands. The maximum simulated winding temperature and the maximum simulated magnet temperature of the target wind turbine unit at different ambient temperatures under the action of the single fan air volume values ​​applied by the multiple centrifugal fans 11 in different operating frequency bands when running at the output power are obtained.

[0120] For each ambient temperature, the maximum simulated winding temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold, and the maximum simulated magnet temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold.

[0121] From a plurality of operating frequency bands that match the ambient temperature and the output power, where the maximum simulated winding temperature is less than the preset winding temperature threshold and the maximum simulated magnet temperature is less than the preset winding temperature threshold, the target operating frequency band with the smallest lower frequency limit is selected as the optimal operating frequency band for a single centrifugal fan 11 that matches the ambient temperature and the output power.

[0122] The total number of centrifugal fans 11 corresponds to the target multi-fan cooling mode. The main control unit 12 can effectively determine the optimal operating frequency band of a single fan when the ventilation frequency conversion cooling system 10 operates in parallel with multiple fans under different output power and different ambient temperatures of the target wind turbine.

[0123] Therefore, by performing the above steps S250 to S2110, this application can effectively determine the optimal operating frequency band of the ventilation frequency conversion cooling system 10 when the single fan is running independently under different output power and different ambient temperatures of the target wind turbine, as well as the optimal operating frequency band of the single fan when multiple fans are running in parallel with different total number of fans.

[0124] In this application, to ensure that the main control unit 12 can effectively execute the aforementioned wind turbine cooling control method, the aforementioned function is achieved by dividing the wind turbine cooling control device 100 stored in the main control unit 12 into functional modules. The specific composition of the wind turbine cooling control device 100 applied to the aforementioned main control unit 12, provided in this application, will be described below.

[0125] Please refer to Figure 5 , Figure 5 This is one of the schematic diagrams of the wind turbine cooling control device 100 provided in the embodiments of this application. In the embodiments of this application, the wind turbine cooling control device 100 may include a turbine operation status acquisition module 110, a ventilation and cooling mode detection module 120, a single wind turbine cooling control module 130, and a multi-wind turbine cooling control module 140.

[0126] The unit operation status acquisition module 110 is used to acquire the average output power and average ambient temperature of the target wind turbine unit within a preset time period.

[0127] The ventilation and cooling mode detection module 120 is used to detect whether the current ventilation and cooling mode of the variable frequency cooling system is a single fan cooling mode or a multi-fan cooling mode.

[0128] The single-fan cooling control module 130 is used to determine, when the ventilation and cooling mode is detected to be a single-fan cooling mode, a first target operating frequency band that matches the average output power and the average ambient temperature from the pre-stored optimal operating frequency bands of the single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine, which are used to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and to control the operation of the single centrifugal fan according to the first target operating frequency band.

[0129] The multi-fan cooling control module 140 is used to, when detecting that the ventilation and cooling mode is a multi-fan cooling mode, determine a second target operating frequency band that matches the average output power and the average ambient temperature from the pre-stored optimal operating frequency bands of multiple centrifugal fans corresponding to the multi-fan cooling mode under different output power and different ambient temperatures to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and control each of the multiple centrifugal fans to operate according to the second target operating frequency band.

[0130] Alternatively, please refer to Figure 6 , Figure 6 This is a second schematic diagram of the composition of the wind turbine cooling control device 100 provided in this application embodiment. In this application embodiment, the wind turbine cooling control device 100 may further include a wind turbine performance curve acquisition module 150, a collaborative working curve simulation module 160, a working frequency band air volume determination module 170, a unit-related data acquisition module 180, a single wind turbine thermal simulation analysis module 190, and a multi-wind turbine thermal simulation analysis module 1110.

[0131] The fan performance curve acquisition module 150 is used to acquire the target air volume-pressure performance curves of the ventilation frequency conversion cooling system at different operating frequency bands when a single centrifugal fan is running, as well as the single fan air volume-pressure performance curves of the ventilation frequency conversion cooling system at different operating frequency bands when multiple centrifugal fans are running in parallel.

[0132] The collaborative operation curve simulation module 160 is used to establish a corresponding collaborative operation simulation model for the target wind turbine and the ventilation frequency conversion cooling system, and to call CFD software to simulate the application of air volume based on the collaborative operation simulation model, so as to obtain the first air volume-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running and the second air volume-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel.

[0133] The working frequency band air volume determination module 170 is used to determine the actual air volume value of a single centrifugal fan in different working frequency bands when operating independently, based on the first air volume-pressure working curve and the target air volume-pressure performance curves corresponding to different working frequency bands, and to determine the single fan air volume value of the multiple centrifugal fans in different working frequency bands when operating in parallel, based on the second air volume-pressure working curve and the single fan air volume-pressure performance curves corresponding to different working frequency bands.

[0134] The unit-related data acquisition module 180 is used to acquire the heat loss parameters of the target wind turbine under different output powers and the unit simulation model of the target wind turbine.

[0135] The single-fan thermal simulation analysis module 190 is used to perform thermal simulation analysis and calculation on the simulation model of the unit according to different ambient temperatures, based on the heat loss parameters of the target wind turbine unit under different output powers and the actual air volume values ​​of a single centrifugal fan in different operating frequency bands during independent operation. The maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold. The module obtains the optimal operating frequency band of a single centrifugal fan that matches different output powers and different ambient temperatures during independent operation.

[0136] The multi-fan thermal simulation analysis module 1110 is used to perform thermal simulation analysis and calculation on the simulation model of the unit according to different ambient temperatures based on the heat loss parameters of the target wind turbine unit under different output power and the single fan air volume values ​​of the multiple centrifugal fans operating in parallel at different operating frequency bands. With the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, the module calls the CFD software to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures, and obtains the optimal operating frequency band of the single fan that matches different output power and different ambient temperatures when the multiple centrifugal fans are operating in parallel.

[0137] It should be noted that the basic principle and technical effects of the wind turbine cooling control device 100 provided in this embodiment are the same as those of the aforementioned wind turbine cooling control method. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the above description of the wind turbine cooling control method.

[0138] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0139] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part. If the various functions provided in this application are implemented in the form of software functional modules and sold or used as independent products, they can be stored in a storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned readable storage medium includes: USB flash drives, mobile hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0140] In summary, in the wind turbine cooling control method and apparatus and the ventilation frequency converter cooling system provided in this application embodiment, after obtaining the average output power and average ambient temperature of the target wind turbine within a preset time period, when the ventilation frequency converter cooling system is in single-fan cooling mode, it determines a first target operating frequency band that matches the average output power and average ambient temperature from the pre-stored optimal operating frequency bands of a single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine. The single centrifugal fan is then controlled to operate according to the first target operating frequency band. Furthermore, when the ventilation frequency converter cooling system is in multi-fan cooling mode, it determines the optimal operating frequency band of a single fan corresponding to multiple centrifugal fans under different output power and different ambient temperatures from the pre-stored optimal operating frequency bands of the single fan. Within the optimal operating frequency band, a second target operating frequency band matching the average output power and average ambient temperature is determined. Each centrifugal fan among multiple centrifugal fans is then controlled according to this second target operating frequency band. This leverages the characteristic that the optimal operating frequency band or the optimal operating frequency band for a single fan ensures that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold. Based on the actual fan operating conditions of the ventilation variable frequency cooling system, the frequency modulation control effect of the centrifugal fan is achieved by comprehensively considering the ambient temperature, the actual output power of the wind turbine, the allowable winding temperature, and the allowable magnet temperature. Furthermore, based on the characteristic that ambient temperature changes infrequently, the frequency modulation control frequency of the centrifugal fan is effectively reduced. This improves both the service life and operating efficiency of the wind turbine and the service life of the ventilation variable frequency cooling system.

[0141] The above descriptions are merely various embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooling control method for a wind turbine generator set, characterized in that, A method for applying a ventilation-inverter cooling system mounted on a target wind turbine unit, the method comprising: Obtain the average output power and average ambient temperature of the target wind turbine within a preset time period; Detect whether the current ventilation and cooling mode of the variable frequency cooling system is single-fan cooling mode or multi-fan cooling mode; When it is detected that the ventilation and cooling mode is a single-fan cooling mode, a first target operating frequency band that matches the average output power and the average ambient temperature is determined from the pre-stored optimal operating frequency bands of the single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine, which are used to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold. The single centrifugal fan is then controlled to operate according to the first target operating frequency band. When it is detected that the ventilation and cooling mode is a multi-fan cooling mode, a second target operating frequency band that matches the average output power and the average ambient temperature is determined from the pre-stored optimal operating frequency bands of multiple centrifugal fans corresponding to the multi-fan cooling mode under different output power and different ambient temperatures to ensure that the maximum winding temperature is less than the preset winding temperature threshold and the maximum magnet temperature is less than the preset magnet temperature threshold. Each centrifugal fan is then controlled to operate according to the second target operating frequency band. The method further includes: Obtain the target air volume-pressure performance curves of the ventilation variable frequency cooling system at different operating frequency bands when a single centrifugal fan is running, and the single fan air volume-pressure performance curves of the ventilation variable frequency cooling system at different operating frequency bands when multiple centrifugal fans are running in parallel. A corresponding collaborative operation simulation model is established for the target wind turbine and the ventilation variable frequency cooling system. CFD software is then used to simulate the application of air volume based on the collaborative operation simulation model. The first air volume-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running and the second air volume-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel are obtained. Based on the first air volume-pressure working curve and the target air volume-pressure performance curves corresponding to different working frequency bands, the actual air volume values ​​of a single centrifugal fan in different working frequency bands during independent operation are determined. Based on the second air volume-pressure working curve and the single fan air volume-pressure performance curves corresponding to different working frequency bands, the single fan air volume values ​​of the multiple centrifugal fans in different working frequency bands during parallel operation are determined. Obtain the heat loss parameters of the target wind turbine at different output powers and the turbine simulation model of the target wind turbine; Based on the heat loss parameters of the target wind turbine at different output powers and the actual air volume of a single centrifugal fan at different operating frequency bands during independent operation, with the maximum winding temperature being less than a preset winding temperature threshold and the maximum magnet temperature being less than a preset magnet temperature threshold as constraints, the CFD software is called to perform thermal simulation analysis and calculation on the turbine simulation model according to different ambient temperatures, so as to obtain the optimal operating frequency band of a single centrifugal fan that matches different output powers and different ambient temperatures during independent operation. Based on the heat loss parameters of the target wind turbine at different output powers and the air volume of a single centrifugal fan at different operating frequency bands when the multiple centrifugal fans are running in parallel, with the maximum winding temperature being less than a preset winding temperature threshold and the maximum magnet temperature being less than a preset magnet temperature threshold as constraints, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to different ambient temperatures, so as to obtain the optimal operating frequency band of a single fan that matches different output powers and different ambient temperatures when the multiple centrifugal fans are running in parallel.

2. The method according to claim 1, characterized in that, The step of calling CFD software to simulate airflow application based on the collaborative operation simulation model and obtaining the first airflow-pressure operating curve of the collaborative operation simulation model when a single centrifugal fan is running includes: Based on multiple preset reference air volume values ​​when a single centrifugal fan operates independently, the CFD software is invoked to simulate the air volume of a single centrifugal fan on the collaborative operation simulation model, thereby obtaining the simulated wind resistance values ​​corresponding to each preset reference air volume value of the collaborative operation simulation model. Data fitting was performed on the simulated wind resistance values ​​corresponding to multiple sets of preset reference air volume values ​​to obtain the first air volume-wind pressure working curve of a single centrifugal fan during operation.

3. The method according to claim 2, characterized in that, The step of calling CFD software to simulate airflow application based on the collaborative operation simulation model, and obtaining the second airflow-pressure operating curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel, includes: According to the multiple preset single fan air volume values ​​when the multiple centrifugal fans are running in parallel, the CFD software is called to simulate the air volume of the multiple centrifugal fans on the collaborative operation simulation model, so as to obtain the simulated wind resistance value corresponding to each preset single fan air volume value of the collaborative operation simulation model. Data fitting is performed on the simulated wind resistance values ​​corresponding to the preset single fan air volume values ​​to obtain the second air volume-wind pressure working curve when the multiple centrifugal fans are running in parallel.

4. The method according to claim 1, characterized in that, The step of obtaining the optimal operating frequency band for a single centrifugal fan under independent operation, based on the heat loss parameters of the target wind turbine at different output powers and the actual air volume values ​​of a single centrifugal fan at different operating frequency bands during independent operation, with the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and by calling the CFD software to perform thermal simulation analysis and calculation on the turbine simulation model according to different ambient temperatures, includes: For each output power, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to the heat loss parameters corresponding to the output power, various ambient temperatures, and the actual air volume value of the single centrifugal fan in different operating frequency bands. The maximum simulated winding temperature and the maximum simulated magnet temperature of the target wind turbine unit at different ambient temperatures under the action of the actual air volume value applied by the single centrifugal fan in different operating frequency bands when running at the output power. For each ambient temperature, the maximum simulated winding temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold, and the maximum simulated magnet temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold. From multiple operating frequency bands that match the ambient temperature and output power, where the maximum simulated winding temperature is less than the preset winding temperature threshold and the maximum simulated magnet temperature is less than the preset winding temperature threshold, the target operating frequency band with the smallest lower frequency limit is selected as the optimal operating frequency band for the single centrifugal fan that matches the ambient temperature and output power.

5. The method according to claim 1, characterized in that, The step of determining the optimal operating frequency band for each centrifugal fan in parallel operation, based on the heat loss parameters of the target wind turbine at different output powers and the air volume values ​​of a single fan at different operating frequency bands of the multiple centrifugal fans operating in parallel, with the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and by calling the CFD software to perform thermal simulation analysis and calculation on the turbine simulation model according to different ambient temperatures, includes: For each output power, the CFD software is called to perform thermal simulation analysis and calculation on the unit simulation model according to the heat loss parameters corresponding to the output power, various ambient temperatures, and the single fan air volume values ​​of the multiple centrifugal fans in different operating frequency bands. The maximum simulated winding temperature and maximum simulated magnet temperature of the target wind turbine unit at different ambient temperatures under the action of the single fan air volume values ​​applied by the multiple centrifugal fans in different operating frequency bands when running at the output power are obtained. For each ambient temperature, the maximum simulated winding temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold, and the maximum simulated magnet temperature corresponding to each of the different operating frequency bands that match the ambient temperature and the output power is compared with the preset winding temperature threshold. From multiple operating frequency bands that match the ambient temperature and output power, where the maximum simulated winding temperature is less than the preset winding temperature threshold and the maximum simulated magnet temperature is less than the preset winding temperature threshold, the target operating frequency band with the smallest lower frequency limit is selected as the optimal operating frequency band for a single centrifugal fan that matches the ambient temperature and output power.

6. The method according to any one of claims 1-5, characterized in that, The step of detecting whether the current ventilation and cooling mode of the variable frequency cooling system is a single-fan cooling mode or a multi-fan cooling mode includes: Check whether each of the multiple centrifugal fans in the ventilation variable frequency cooling system has an operational fault; If only one centrifugal fan is found to be functioning properly, it is determined that the current ventilation and cooling mode of the variable frequency cooling system is single-fan cooling mode. If at least two centrifugal fans are found to be free of operational faults, the current ventilation and cooling mode of the variable frequency cooling system is determined to be the multi-fan cooling mode.

7. A wind turbine cooling control device, characterized in that, A ventilation-controlled variable frequency cooling system applied to a target wind turbine unit, the device comprising: The unit operation status acquisition module is used to acquire the average output power and average ambient temperature of the target wind turbine unit within a preset time period. The ventilation and cooling mode detection module is used to detect whether the current ventilation and cooling mode of the variable frequency cooling system is a single fan cooling mode or a multi-fan cooling mode. A single-fan cooling control module is used to, when detecting that the ventilation and cooling mode is a single-fan cooling mode, determine a first target operating frequency band that matches the average output power and the average ambient temperature from the pre-stored optimal operating frequency bands of a single centrifugal fan corresponding to the single-fan cooling mode under different output power and different ambient temperatures of the target wind turbine, which are used to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, and control the operation of the single centrifugal fan according to the first target operating frequency band; The multi-fan cooling control module is used to determine a second target operating frequency band that matches the average output power and the average ambient temperature from a pre-stored list of optimal operating frequency bands for a plurality of centrifugal fans corresponding to the multi-fan cooling mode under different output power and different ambient temperatures, which are used to ensure that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold. The module then controls each of the plurality of centrifugal fans to operate according to the second target operating frequency band. The device further includes: The fan performance curve acquisition module is used to acquire the target air volume-pressure performance curves of the ventilation frequency conversion cooling system at different operating frequency bands when a single centrifugal fan is running, and the single fan air volume-pressure performance curves of the ventilation frequency conversion cooling system at different operating frequency bands when multiple centrifugal fans are running in parallel. The collaborative operation curve simulation module is used to establish a corresponding collaborative operation simulation model for the target wind turbine and the ventilation frequency conversion cooling system, and call CFD software to simulate the application of air volume based on the collaborative operation simulation model to obtain the first air volume-pressure working curve of the collaborative operation simulation model when a single centrifugal fan is running and the second air volume-pressure working curve of the collaborative operation simulation model when multiple centrifugal fans are running in parallel. The working frequency band air volume determination module is used to determine the actual air volume value of a single centrifugal fan in different working frequency bands when it is running independently, based on the first air volume-pressure working curve and the target air volume-pressure performance curves corresponding to different working frequency bands, and to determine the single fan air volume value of the multiple centrifugal fans in different working frequency bands when they are running in parallel, based on the second air volume-pressure working curve and the single fan air volume-pressure performance curves corresponding to different working frequency bands. The unit-related data acquisition module is used to acquire the heat loss parameters of the target wind turbine under different output powers and the unit simulation model of the target wind turbine. The single-fan thermal simulation analysis module is used to perform thermal simulation analysis and calculation on the simulation model of the unit according to different ambient temperatures based on the heat loss parameters of the target wind turbine unit under different output powers and the actual air volume values ​​of a single centrifugal fan in different operating frequency bands when running independently. The module uses the constraint that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold to call the CFD software to perform thermal simulation analysis and calculation on the unit simulation model under different ambient temperatures, so as to obtain the optimal operating frequency band of a single centrifugal fan that matches different output powers and different ambient temperatures when running independently. The multi-fan thermal simulation analysis module is used to perform thermal simulation analysis and calculation on the simulation model of the unit under different ambient temperatures based on the heat loss parameters of the target wind turbine unit under different output powers and the air volume values ​​of the single fan in different operating frequency bands when the multiple centrifugal fans are running in parallel. With the constraints that the maximum winding temperature is less than a preset winding temperature threshold and the maximum magnet temperature is less than a preset magnet temperature threshold, the module calls the CFD software to perform thermal simulation analysis and calculation on the unit simulation model under different ambient temperatures to obtain the optimal operating frequency band of the single fan that matches the different output powers and different ambient temperatures when the multiple centrifugal fans are running in parallel.

8. A ventilation variable frequency cooling system, characterized in that, The ventilation frequency conversion cooling system is installed on the target wind turbine. The ventilation frequency conversion cooling system includes a main control unit and multiple centrifugal fans. The main control unit is communicatively connected to the multiple centrifugal fans and is used to adjust the actual operating frequency band of each centrifugal fan so that each centrifugal fan can cool the target wind turbine. The main control unit includes a processor and a memory. The memory stores a computer program that can be executed by the processor. The processor can execute the computer program to implement the wind turbine cooling control method according to any one of claims 1-6.

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