Automatic water supplement device and pressure regulating system of water cooling system of wind driven generator

Abstract

The present application relates to the technical field of automatic adjustment, in particular to an automatic water supplement device and a pressure regulating system of a water cooling system of a wind driven generator, the pressure regulating system of the present application evaluates the power generation environment where the wind driven generator is located by setting a heat dissipation effectiveness analysis module to judge the external heat dissipation condition thereof, and further evaluates the output stability of the generator under the current external heat dissipation condition by setting a precooling amplitude acquisition module, a water cooling system starting module and a precooling effectiveness analysis module to judge the cooling load of the generator under the current working state, so as to realize self-adaptive monitoring of the cooling effect, and the pressure regulating module is set to realize self-adaptive control of the cooling liquid pressure according to the temperature variation trend generated by the precooling operation to ensure the stable operation of the wind driven generator, the automatic water supplement device and the pressure regulating system of the present application are signal connected, the change of the cooling liquid pressure is automatically detected and the liquid is supplemented to effectively maintain the pressure stability of the cooling liquid in the circulating cooling pipeline.

Description

Technical Field

[0001] This invention relates to the field of automated regulation technology, specifically to an automatic water replenishment device and pressure regulation system for a wind turbine water cooling system. Background Technology

[0002] In recent years, with the gradual increase in the power of wind turbine generator sets (hereinafter referred to as wind turbines) and the increasing integration of electronic components in wind turbines, as well as the reduction in overall size, the number of components per unit volume has increased, such as IGBTs, filter capacitors, and pitch motors. This has led to a denser heat flow around the wind turbines. Therefore, under the dual requirements of power and integration, wind turbines generate more heat, increasing the pressure on heat dissipation and thus requiring a corresponding improvement in the performance requirements of water cooling systems.

[0003] In existing technologies, the flow of coolant in a water-cooling system is typically controlled by preset water pressure, which allows for basic regulation of the coolant flow rate. However, wind turbines operate in environments with rapid changes and have higher power outputs from their blades, resulting in greater input power requirements for hardware such as inverters. This leads to increased heat dissipation in the wind turbine. Simply using existing cooling systems can result in inefficient heat dissipation, causing components to overheat and affecting the stability of the wind turbine.

[0004] To address the issue of inadequate heat removal from wind turbines, existing technologies utilize automatic water replenishment devices combined with pressure regulation systems to sense the dynamic output of the wind turbine and adjust the coolant pressure accordingly. However, the unpredictable and easily disturbed wind speeds in the wind environment can interfere with the real-time operation of the wind turbine, leading to greater variations in its output states. Adjusting the coolant pressure based solely on the rate of transition between output states would result in even more unstable transitions and inconsistent cooling requirements. Therefore, optimizing the scheduling of cooling states is necessary to ensure stable operation of the wind turbine. Summary of the Invention

[0005] In order to solve the above technical problems, the purpose of this invention is to provide an automatic water replenishment device and pressure regulation system for a wind turbine water cooling system.

[0006] According to a first aspect of the present invention, a pressure regulation system for a wind turbine water cooling system is provided, and the specific technical solution adopted is as follows:

[0007] A pressure regulation system for a wind turbine water-cooling system, comprising:

[0008] The data acquisition module is used to acquire the output power of the wind turbine and the internal and external ambient temperatures at multiple monitoring points of the wind turbine's water cooling system in real time.

[0009] The heat dissipation effectiveness analysis module is used to analyze the heat exchange trend of the wind turbine based on the internal temperature and the external ambient temperature, and combine the output power to obtain the heat dissipation effectiveness of the wind turbine at each time.

[0010] The precooling range acquisition module is used to analyze the environmental condition index for precooling the wind turbine based on the heat dissipation effectiveness, and combine the internal temperature and the external ambient temperature to obtain the precooling range of the wind turbine at the current moment.

[0011] The water cooling system start-up module is used to start the water cooling system and perform precooling operation according to the precooling range.

[0012] The precooling effectiveness analysis module is used to obtain the precooling effectiveness at each moment during the precooling operation based on the heat dissipation effectiveness and the precoolable range.

[0013] The pressure regulation module is used to adaptively control the cooling hydraulic pressure during the precooling operation, based on the internal temperature, the precooling range, and the precooling effectiveness at the current moment of the precooling operation.

[0014] In some embodiments of the present invention, the heat dissipation effectiveness analysis module includes:

[0015] The heat exchange trend analysis unit is used to analyze the temperature difference between the internal temperature and the external ambient temperature at each monitoring point at each time, and to analyze the dispersion of the internal temperature at all monitoring points at each time, so as to obtain the heat exchange trend index of the wind turbine at each time.

[0016] The heat generation capacity analysis unit is used to analyze the relationship between the output power and the rated output power at each time point, and to obtain the heat generation capacity index of the wind turbine at each time point.

[0017] The heat dissipation effectiveness acquisition unit is used to combine the heat exchange trend index and the heat generation capacity index to obtain the heat dissipation effectiveness of the wind turbine at each time.

[0018] In some embodiments of the present invention, the precooling amplitude acquisition module includes:

[0019] The environmental condition index analysis unit is used to analyze the relationship between the heat dissipation effectiveness at the current moment and the previous moment, and to obtain the environmental condition index of the wind turbine pre-cooling at the current moment.

[0020] The cooling space index analysis unit is used to analyze the difference between the average internal temperature and the external ambient temperature at all monitoring points at the current moment, and to obtain the cooling space index of the wind turbine precooling at the current moment.

[0021] The precooling range acquisition unit is used to combine the environmental condition index and the cooling space index to obtain the precooling range of the wind turbine at the current moment.

[0022] In some embodiments of the present invention, the water cooling system startup module is configured as follows:

[0023] Determine whether the precooling range is greater than 0;

[0024] If so, a water cooling system start signal is sent to control the water cooling system to start and perform pre-cooling operation.

[0025] In some embodiments of the present invention, the precooling effectiveness analysis module includes:

[0026] The heat dissipation stability index analysis unit is used to analyze the difference between the heat dissipation effectiveness at the current time of the precooling operation and the start time of the precooling operation, and to obtain the heat dissipation stability index at each time during the precooling operation.

[0027] The temperature stability index analysis unit is used to analyze the temperature stability trend between the precooling operation process time and the precooling operation start time according to the precooling range, and to obtain the temperature stability index at each time during the precooling operation process, wherein the precooling operation process time is all the time between the precooling operation start time and the current time of the precooling operation.

[0028] The precooling effectiveness acquisition unit is used to combine the heat dissipation stability index and the temperature stability index to obtain the precooling effectiveness at each moment during the precooling operation.

[0029] In some embodiments of the present invention, the temperature stability index analysis unit is configured as follows:

[0030] By analyzing the difference between the mean precoolable amplitude at all moments during the precooling operation and the precoolable amplitude at the start of the precooling operation, the temperature stability index at each moment during the precooling operation is obtained.

[0031] In some embodiments of the present invention, the pressure regulating module includes:

[0032] The precooling start unit is used to set the cooling target temperature according to the internal temperature and the precoolable range at the start of the precooling operation, and to use the precooling effectiveness at each moment during the precooling operation as the global weight of the PID controller at the next moment. In addition, the PID controller outputs the adjustment pressure control valve set value at the next moment by combining the temperature monitoring value at the current moment of the precooling operation.

[0033] The pre-cooling unit is used to identify whether the coolant pressure is within the allowable fluctuation range of the pressure control valve setting. If the coolant pressure is lower than the lower limit of the pressure range, the automatic water replenishment device is activated to start replenishing water. If the coolant pressure rises sharply, the pressure relief valve is opened in stages.

[0034] The precooling termination unit is used to preset a precooling effectiveness threshold; determine whether the preset precooling effectiveness at the current time of the precooling operation is less than or equal to the precooling effectiveness threshold; if so, gradually increase the pressure control valve setting value to the rated range and end the precooling operation.

[0035] In some embodiments of the present invention, setting a target cooling temperature based on the internal temperature at the start of the precooling operation and the precoolable range includes:

[0036] Calculate the average internal temperature at all monitoring points at the start of the precooling operation;

[0037] The precoolable temperature value is obtained based on the average internal temperature and the precoolable range.

[0038] The target cooling temperature is obtained by combining the target cooling temperature with the average internal temperature.

[0039] In some embodiments of the present invention, the data acquisition module is configured to deploy temperature sensors at the heat exchange contact surfaces between the wind turbine water cooling system and various components to obtain the internal temperature at multiple monitoring points.

[0040] According to a second aspect of the present invention, an automatic water replenishment device for a wind turbine water cooling system is provided, comprising: a water replenishment tank, a water replenishment pump, a water replenishment pipeline, and a water replenishment controller. The water replenishment controller is signal-connected to the pressure regulation system provided in any one of the first aspects of the present invention, and can automatically detect changes in the coolant pressure in the pressure regulation system and replenish the coolant.

[0041] Compared with existing technologies, the automatic water replenishment device and pressure regulation system for a wind turbine water cooling system provided by this invention have the following advantages:

[0042] The pressure regulation system of this invention collects data on the output power and internal and external temperatures of the wind turbine generator through a data acquisition module, providing a data foundation for subsequent analysis. It assesses the current power generation environment of the wind turbine generator through a heat dissipation effectiveness analysis module, analyzes the heat exchange trend of the wind turbine generator, and determines its external heat dissipation conditions. Furthermore, it includes a pre-cooling range acquisition module, a water cooling system startup module, and a pre-cooling effectiveness analysis module to analyze the pre-cooling range of the wind turbine generator, perform pre-cooling operations, and analyze the pre-cooling effectiveness at each moment during the pre-cooling operation. This further evaluates the generator's output stability under the current external heat dissipation conditions and determines the cooling load brought by the generator in the current operating state, thereby achieving adaptive monitoring of the cooling process. By setting up a pressure regulation module, it achieves adaptive control of the cooling fluid pressure during the start, process, and end stages of the pre-cooling operation based on the temperature change trend generated by the pre-cooling operation, ensuring the stable operation of the wind turbine generator. The automatic water replenishment device of this invention is signal-connected to the pressure regulation system, automatically detecting changes in coolant pressure and replenishing it, effectively maintaining the stability of the coolant pressure in the circulating cooling pipeline. Attached Figure Description

[0043] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic diagram of the basic components of a pressure regulation system for a wind turbine water cooling system provided in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the basic components of an automatic water replenishment device for a wind turbine water cooling system provided in one embodiment of the present invention. Detailed Implementation

[0046] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of an automatic water replenishment device and pressure regulation system for a wind turbine water-cooling system proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms such as “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or device comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such article or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of additional identical elements in the article or device that includes the element.

[0048] The following description, in conjunction with the accompanying drawings, details a specific scheme for a pressure regulation system of a wind turbine water cooling system provided by the present invention.

[0049] Please see Figure 1 This illustrates the basic components of a pressure regulation system for a wind turbine water cooling system provided in one embodiment of the present invention.

[0050] like Figure 1 As shown, an embodiment of the present invention provides a pressure regulation system for a wind turbine water-cooling system, specifically including: a data acquisition module 10, a heat dissipation effectiveness analysis module 20, a precooling range acquisition module 30, a water-cooling system start-up module 40, a precooling effectiveness analysis module 50, and a pressure regulation module 60. The heat dissipation effectiveness analysis module 20 includes a heat exchange trend analysis unit 21, a heat generation capacity analysis unit 22, and a heat dissipation effectiveness acquisition unit 23. The precooling range acquisition module 30 includes an environmental condition index analysis unit 31, a cooling space index analysis unit 32, and a precooling range acquisition unit 33. The precooling effectiveness analysis module 50 includes a heat dissipation stability index analysis unit 51, a temperature stability index analysis unit 52, and a precooling effectiveness acquisition unit 53.

[0051] The system includes a data acquisition module for real-time acquisition of the wind turbine's output power and the internal and external ambient temperatures at multiple monitoring points on the wind turbine's water-cooling system. Specifically, this module is configured to deploy temperature sensors at the heat exchange contact surfaces between the wind turbine's water-cooling system and various components to acquire real-time internal temperature data at multiple monitoring points. Simultaneously, a temperature sensor is also installed on the outside of the wind turbine to acquire real-time external ambient temperature data. Furthermore, the module acquires real-time current and voltage values ​​at the wind turbine's power output terminals, thereby determining the wind turbine's real-time output power.

[0052] The output environment of wind turbines depends on stable wind resources, but the generation of wind resources is highly random, resulting in poor output sustainability. Therefore, the cooling load requirements of water cooling systems vary at different cooling load stages. First, it is necessary to identify the output fluctuations of wind turbines and assess the cooling load based on the trend and magnitude of these fluctuations. Then, the stability of the cooling load is used to distinguish the wind turbine states. Finally, the transition rate between wind turbine states provides the timing and extent for pressure adjustment control of the water cooling system to meet the cooling requirements of the wind turbines under different states.

[0053] Based on the above analysis, in the embodiments of the present invention, the output environment of the wind turbine is evaluated and the impact of changes in the output environment on the cooling load at different stages is analyzed through the heat dissipation effectiveness analysis module, the pre-cooling range acquisition module, the water cooling system start-up module, and the pre-cooling effectiveness analysis module.

[0054] The heat dissipation effectiveness analysis module is used to analyze the heat exchange trend of the wind turbine based on the internal temperature and the external ambient temperature, and combined with the output power to obtain the heat dissipation effectiveness of the wind turbine at various times. Further, the heat dissipation effectiveness analysis module includes a heat exchange trend analysis unit, a heat generation capacity analysis unit, and a heat dissipation effectiveness acquisition unit. Specifically:

[0055] Wind turbines rely on a water-cooling system to dissipate heat from the coolant at the contact points with the components. The coolant, carrying this heat, flows through pipelines to a heat exchanger. The heat exchanger cools the wind turbine components by bringing the hot coolant into contact with the cold external environment. Therefore, by assessing the thermal differences between the coolant's contact points with the external environment, the effectiveness of external heat dissipation conditions can be evaluated. When external heat dissipation is efficient, the coolant's heat can be released more easily to the outside.

[0056] Based on the above analysis, in some embodiments of the present invention, a heat exchange trend analysis unit is set in the heat dissipation effectiveness analysis module to analyze the degree of temperature difference between the internal temperature and the external ambient temperature at each monitoring point at each time, and to analyze the degree of dispersion of the internal temperature at all detection points at each time, so as to obtain the heat exchange trend index of the wind turbine at each time.

[0057] In addition, in some embodiments of the present invention, a heat generation capacity analysis unit is set in the heat dissipation effectiveness analysis module to analyze the relationship between the output power and the rated output power at each time, so as to obtain the heat generation capacity index of the wind turbine at each time.

[0058] Finally, by setting up a heat dissipation effectiveness acquisition unit in the heat dissipation effectiveness analysis module, the heat exchange trend index and heat generation capacity index are combined to obtain the heat dissipation effectiveness of the wind turbine at each time point. The formula for calculating the heat dissipation effectiveness of the wind turbine at time t is:

[0059]

[0060] In the formula, y t This indicates the effectiveness of heat dissipation of the wind turbine at time t; w max This indicates the rated output power of the wind turbine generator; w t n represents the output power of the wind turbine at time t; a This indicates the number of temperature monitoring points located within the internal components of a wind turbine (the number of temperature sensors installed inside the wind turbine); T a,t This represents the internal temperature of the wind turbine generator at monitoring point a at time t (the temperature monitored by the temperature sensor installed at monitoring point a); T out,t This indicates the ambient temperature of the wind turbine at time t (the temperature monitored by the external temperature sensor installed on the wind turbine). This represents the standard deviation of the internal temperature at all monitoring points where the internal components of the wind turbine are located; norm represents the linear normalization function; +0.1 is to prevent the denominator from being 0.

[0061] At time t, the rated output power w of the wind turbine max With output power w t The ratio represents the heat generation capacity index of a wind turbine at various times. The larger the value of this formula, the smaller the current output power of the wind turbine at time t, the easier it is to dissipate heat, and the higher the corresponding heat dissipation effectiveness.

[0062] Let T be the internal temperature T measured by temperature sensors at various temperature monitoring points a in the wind turbine at time t. a,t With external ambient temperature T out,t The difference, and then the standard deviation of the internal temperature at each temperature monitoring point a. The ratio represents the heat exchange trend index of the wind turbine at various times. The larger the value of this formula, the higher the temperature of the device and the stronger the heat exchange trend. The device at the current location is more likely to have its heat carried away by the flow of coolant. At the same time, the denominator determines the effectiveness of the coolant in carrying heat by the temperature difference between the devices. In other words, the coolant is less likely to cause the heat of the high-temperature device to spread to other device locations due to its flow in the pipeline.

[0063] By traversing the locations of each component, the overall heat dissipation effectiveness of the wind turbine at time t is obtained. Furthermore, based on real-time monitoring parameters, the heat dissipation effectiveness of the wind turbine at each specific time point is determined.

[0064] The precooling range acquisition module is used to analyze the environmental condition index for precooling the wind turbine based on the effectiveness of heat dissipation, and combine the internal temperature and the external ambient temperature to obtain the precooling range of the wind turbine at the current moment.

[0065] When output power is high (generating a lot of heat) and heat dissipation conditions are good, slight overcooling (within safe limits) is possible, or additional cooling capacity (such as a backup fan) can be activated. This is equivalent to using surplus power to lower the temperature of the wind turbine to a level lower than the normal operating setpoint when there is abundant wind and low grid demand, in order to store "cooling capacity" (reflected in the heat capacity of the wind turbine components and cooling medium). Therefore, by setting a pre-cooling range acquisition module, based on the effectiveness of heat dissipation, the environmental condition index for wind turbine pre-cooling is analyzed, and combined with the internal temperature and the external ambient temperature, the pre-cooling range of the wind turbine at the current moment is determined.

[0066] From the current moment on, the higher the heat dissipation efficiency and the longer the heat dissipation efficiency remains high, the smaller the fluctuations in the high efficiency range, indicating that more cold energy can be stored at present. Therefore, the pre-cooling intensity should be higher, so as to provide the wind turbine with a temperature closer to the external environment. This makes it more difficult for the heat generated by the fluctuations in the output load of the wind turbine to cause abnormal changes in the heat dissipation conditions in a short period of time, reflecting that the output power of the wind turbine is more stable and controllable, and the output environment is more normal.

[0067] Based on the above analysis, in some embodiments of the present invention, the precooling range acquisition module further includes an environmental condition index analysis unit, a cooling space index analysis unit, and a precooling range acquisition unit. Specifically:

[0068] The environmental condition index analysis unit is used to analyze the relationship between the heat dissipation effectiveness at the current moment and the previous moment, and to obtain the environmental condition index of the wind turbine precooling at the current moment.

[0069] The cooling space index analysis unit is used to analyze the difference between the average internal temperature and the external ambient temperature at all monitoring points at the current moment, and to obtain the cooling space index of the wind turbine precooling at the current moment.

[0070] The precooling range acquisition unit is used to combine the environmental condition index and the cooling space index to obtain the precooling range of the wind turbine at the current moment. The formula for calculating the precooling range of the wind turbine at the current moment t0 is:

[0071]

[0072] In the formula, This indicates the precooling range of the wind turbine at the current time t0; This represents the average internal temperature of all temperature monitoring points inside the wind turbine at the current time t0. This represents the ambient temperature of the wind turbine at the current time t0; This indicates the effectiveness of the wind turbine's heat dissipation at the current time t0; This indicates the heat dissipation effectiveness of the wind turbine at time t0-1 (the time before the current time t0); softsign represents the nonlinear normalization function, and the normalized value range is (-1, 1).

[0073] This represents the average internal temperature of all temperature monitoring points at the current time t0. Compared with the external ambient temperature value The difference represents the cooling space index of the wind turbine precooling at the current moment. This formula reflects the temperature difference of the wind turbine's current operating temperature. The greater the temperature difference, the more heat the device can dissipate to the outside at the current moment t0. Therefore, the larger the range of precooling, the greater the space for temperature reduction, and the more significantly the temperature rise can be suppressed after precooling.

[0074] The ratio of the heat dissipation effectiveness at the current time t0 to that at the previous time t0-1. The difference between 1 / 2 and 1 / 2 represents the environmental condition index for pre-cooling the wind turbine at the current moment. The larger this value, the higher the heat dissipation effectiveness at the current moment compared to the previous moment. This indicates that the external temperature environment of the wind turbine and the heat generation environment of the wind turbine components are more similar at the current moment, thus providing a better environmental requirement for pre-cooling at the current moment. That is, if the current moment t0 is more stable than the previous moment t0-1, then the fraction... If the value is greater than 1, it can provide a larger pre-cooling range; further, by using -1 / 2, it can ensure that the pre-cooling range is maintained within a stable range, avoiding the target pre-cooling temperature from being lower than the ambient temperature, which would increase the power consumption of the water cooling system and cause the load stability of the water cooling system to deteriorate.

[0075] The water cooling system startup module is used to start the water cooling system and perform precooling operations based on the precooling range. Specifically, the water cooling system startup module is configured to: determine whether the precooling range is greater than 0; if so, send a water cooling system startup signal to control the water cooling system to start and perform precooling operations; if not, do not perform precooling operations.

[0076] The precooling effectiveness analysis module is used to obtain the precooling effectiveness at each moment during the precooling operation based on the heat dissipation effectiveness and the precooling range.

[0077] After performing the precooling operation, the effectiveness of the precooling operation at the current moment is evaluated using a precooling effectiveness analysis module. If the thermal state deviation of the wind turbine is greater (the heat dissipation effect is worse) in the first time period after a single precooling operation, and there is a deviation between the precooling amplitude at the start time and the current time of the precooling operation, and the heat dissipation effectiveness increases more slowly and the interval is shorter, it indicates that the precooling operation has a limited impact on the efficiency improvement of the wind turbine's water cooling system. Therefore, the precooling effectiveness is assessed at any time after the precooling operation is performed.

[0078] Based on the above analysis, in some embodiments of the present invention, the pre-cooling effectiveness analysis module further includes a heat dissipation stability index analysis unit, a temperature stability index analysis unit, and a pre-cooling effectiveness acquisition unit. Specifically:

[0079] The heat dissipation stability index analysis unit is used to analyze the difference in heat dissipation effectiveness between the current time of the pre-cooling operation and the time of the start of the pre-cooling operation, and to obtain the heat dissipation stability index at each moment during the pre-cooling operation.

[0080] The temperature stability index analysis unit is used to analyze the temperature stability trend between the precooling operation process time and the precooling operation start time based on the precooling range, and obtain the temperature stability index at each time point during the precooling operation process. The precooling operation process time includes all times between the precooling operation start time and the current precooling operation time. More specifically, the temperature stability index analysis unit is configured to: analyze the difference between the average precooling range at all precooling operation process times and the precooling range at the precooling operation start time, and obtain the temperature stability index at each time point during the precooling operation process.

[0081] The precooling effectiveness acquisition unit combines the heat dissipation stability index and the temperature stability index to obtain the precooling effectiveness at each moment during the precooling operation. The current time t during the precooling operation... ′ The formula for calculating the effectiveness of precooling is:

[0082]

[0083] In the formula, v k,t′ This indicates the effectiveness of precooling operation k at the current time t′; y k,t′ This indicates the heat dissipation effectiveness of the wind turbine at time t′ during the pre-cooling operation k. This indicates the time t at the start of the pre-cooling operation k of the wind turbine. k The effectiveness of heat dissipation at that time; t′ represents the current time when the pre-cooling operation k is in progress; tk Pre-cooling operation k starts at time k; Indicates the start time t of the pre-cooling operation k. k The precooling range of wind turbine generators; Indicates the start time t of the pre-cooling operation k. k Pre-cooling operation k is currently in progress at time t ′ The sum of the precoolable amplitudes of the wind turbine at all times between (including the start and current times); norm represents the linear normalization function.

[0084] The heat dissipation effectiveness y at the current time t′ of the pre-cooling operation k. k,t′ With the pre-cooling operation k starting at time t k Heat dissipation effectiveness The difference represents the heat dissipation stability index at time t′ when the precooling operation k is currently in progress. The larger the difference, the more stable the overall temperature environment of the wind turbine is at the time of the precooling operation k compared to the start time of the precooling operation k, indicating that the precooling operation is more effective; and +1 is used to ensure that the difference is never negative.

[0085] For the pre-cooling operation, start time t k The average precooling amplitude at all times up to the current time t′ and the precooling operation k starting time t k The absolute value of the difference in the precooling range of the wind turbine represents the temperature stability index at the current time t′ of the precooling operation. The larger the value of this formula, the less obvious the temperature fluctuations during the current precooling operation are. That is, as of the current time t′, the abnormal device temperature caused by the precooling operation is more stable than when the precooling operation was first performed, thus further indicating that the precooling operation is more effective as of the current time t′.

[0086] Therefore, starting from the beginning of the precooling operation, the effectiveness of precooling is monitored in real time at every moment during the precooling operation, thereby achieving adaptive monitoring of the cooling process.

[0087] It should be noted that, since the pre-cooling operation requires reaching the target cooling temperature, the system will not perform any other pre-cooling operations before reaching this target cooling temperature. Therefore, there is no interference in the monitoring data between multiple cooling cycles.

[0088] The pressure regulation module is used to adaptively control the cooling hydraulic pressure during the precooling operation, based on the internal temperature, the available precooling range, and the effectiveness of precooling at the current moment. Furthermore, the pressure regulation module includes a precooling start unit, a precooling initiation unit, and a precooling termination unit. Specifically:

[0089] The pre-cooling start-up unit is used to set the target cooling temperature based on the internal temperature and the pre-cooling range at the start of the pre-cooling operation. More specifically, it calculates the average internal temperature at all monitoring points at the start of the pre-cooling operation, denoted as... Based on the average internal temperature With the range of precooling The precooling temperature value is obtained. The target cooling temperature is then set to... The precooling effectiveness at each moment during the precooling operation is used as the global weight of the PID controller for the next moment (the weight is set to 1 at the first moment). Combined with the temperature monitoring value at the current moment of the precooling operation, the PID controller outputs the setpoint for adjusting the pressure control valve for the next moment. It should be noted that the lower pressure limit is relaxed for the actual target cooling temperature setpoint (e.g., from 1.5 bar to 1.0 bar); this effectively accommodates the natural drop in system pressure caused by coolant volume contraction, avoids false triggering of the safety valve, reduces pump power consumption, and improves precooling efficiency.

[0090] The pre-cooling unit is used to identify whether the coolant pressure is within the allowable fluctuation range of the pressure control valve setting. If the coolant pressure is lower than the lower limit of the pressure range, the automatic water replenishment device is activated to replenish water, and the nitrogen pressurization device is activated to replenish gas to the expansion tank gas chamber. If the coolant pressure rises sharply, the pressure relief valve is opened in stages. This can expand the pressure fluctuation range while preventing cavitation or pipeline deformation.

[0091] The precooling termination unit is used to preset the precooling effectiveness threshold, which can be set to 0.3. It determines whether the preset precooling effectiveness at the current moment of the precooling operation is less than or equal to the precooling effectiveness threshold. If so, it determines that the precooling operation is ineffective and the precooling operation of the wind turbine should be stopped. The pressure control valve setting is gradually increased to the rated range (e.g., 1.5 ± 0.2 bar) to end the precooling operation. This can provide stable heat dissipation for subsequent high-power operation and prevent bubble precipitation.

[0092] Based on the same inventive concept as the above system, this embodiment also provides an automatic water replenishment device for a wind turbine water cooling system.

[0093] Please see Figure 2 This illustrates the basic components of an automatic water replenishment device for a wind turbine water cooling system provided in one embodiment of the present invention.

[0094] like Figure 2As shown, an automatic water replenishment device for a wind turbine water-cooling system includes a water replenishment tank 1, a water replenishment pump 2, a water replenishment pipeline 3, and a water replenishment controller 4. The water replenishment controller 4 is connected to a pressure regulation system 5 and can automatically detect changes in coolant pressure in the pressure regulation system 5 and replenish coolant accordingly. This effectively maintains stable liquid pressure within the circulating cooling pipeline. For example, the expansion tank and pressure control unit work together; when the coolant pressure is lower than the calibrated value (pressure within the pipeline at normal coolant capacity), i.e., when coolant reduction occurs due to leakage or evaporation, the automatic water replenishment device automatically activates.

[0095] The water cooling system of a wind turbine is part of the wind turbine's cooling system to cope with the fluctuations in output caused by sudden changes in wind speed. The automatic water replenishment device can replenish the water cooling system with coolant in real time, realize the adjustment of the cooling hydraulic pressure, and prevent pressure drop caused by evaporation or leakage. The pressure regulation system stabilizes the hydraulic pressure of the water cooling system through a feedback mechanism to ensure the cooling effect.

[0096] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0097] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A pressure regulation system for a wind turbine water-cooling system, characterized in that, The system includes: The data acquisition module is used to acquire the output power of the wind turbine and the internal and external ambient temperatures at multiple monitoring points of the wind turbine's water cooling system in real time. The heat dissipation effectiveness analysis module is used to analyze the heat exchange trend of the wind turbine based on the internal temperature and the external ambient temperature, and combine the output power to obtain the heat dissipation effectiveness of the wind turbine at each time. The precooling range acquisition module is used to analyze the environmental condition index for precooling the wind turbine based on the heat dissipation effectiveness, and combine the internal temperature and the external ambient temperature to obtain the precooling range of the wind turbine at the current moment. The water cooling system start-up module is used to start the water cooling system and perform precooling operation according to the precooling range. The precooling effectiveness analysis module is used to obtain the precooling effectiveness at each moment during the precooling operation based on the heat dissipation effectiveness and the precoolable range. The pressure regulation module is used to adaptively control the cooling hydraulic pressure during the precooling operation, based on the internal temperature and the precoolable range, combined with the precooling effectiveness at the current moment of the precooling operation. The heat dissipation effectiveness analysis module includes: The heat exchange trend analysis unit is used to analyze the temperature difference between the internal temperature and the external ambient temperature at each monitoring point at each time, and to analyze the dispersion of the internal temperature at all monitoring points at each time, so as to obtain the heat exchange trend index of the wind turbine at each time. The heat generation capacity analysis unit is used to analyze the relationship between the output power and the rated output power at each time point, and to obtain the heat generation capacity index of the wind turbine at each time point. The heat dissipation effectiveness acquisition unit is used to combine the heat exchange trend index and the heat generation capacity index to obtain the heat dissipation effectiveness of the wind turbine at each time.

2. The pressure regulation system of the wind turbine water cooling system according to claim 1, characterized in that, The precooling amplitude acquisition module includes: The environmental condition index analysis unit is used to analyze the relationship between the heat dissipation effectiveness at the current moment and the previous moment, and to obtain the environmental condition index of the wind turbine pre-cooling at the current moment. The cooling space index analysis unit is used to analyze the difference between the average internal temperature and the external ambient temperature at all monitoring points at the current moment, and to obtain the cooling space index of the wind turbine precooling at the current moment. The precooling range acquisition unit is used to combine the environmental condition index and the cooling space index to obtain the precooling range of the wind turbine at the current moment.

3. The pressure regulation system of the wind turbine water cooling system according to claim 1, characterized in that, The water cooling system startup module is configured as follows: Determine whether the precooling range is greater than 0; If so, a water cooling system start signal is sent to control the water cooling system to start and perform pre-cooling operation.

4. The pressure regulation system of the wind turbine water cooling system according to claim 1, characterized in that, The precooling effectiveness analysis module includes: The heat dissipation stability index analysis unit is used to analyze the difference between the heat dissipation effectiveness at the current time of the precooling operation and the start time of the precooling operation, and to obtain the heat dissipation stability index at each time during the precooling operation. The temperature stability index analysis unit is used to analyze the temperature stability trend between the precooling operation process time and the precooling operation start time according to the precooling range, and to obtain the temperature stability index at each time during the precooling operation process, wherein the precooling operation process time is all the time between the precooling operation start time and the current time of the precooling operation. The precooling effectiveness acquisition unit is used to combine the heat dissipation stability index and the temperature stability index to obtain the precooling effectiveness at each moment during the precooling operation.

5. The pressure regulation system of the wind turbine water cooling system according to claim 4, characterized in that, The temperature stability index analysis unit is configured as follows: By analyzing the difference between the mean precoolable amplitude at all moments during the precooling operation and the precoolable amplitude at the start of the precooling operation, the temperature stability index at each moment during the precooling operation is obtained.

6. The pressure regulation system of the wind turbine water cooling system according to claim 1, characterized in that, The pressure regulating module includes: The precooling start unit is used to set the cooling target temperature according to the internal temperature and the precoolable range at the start of the precooling operation, and to use the precooling effectiveness at each moment during the precooling operation as the global weight of the PID controller at the next moment. In addition, the PID controller outputs the adjustment pressure control valve set value at the next moment by combining the temperature monitoring value at the current moment of the precooling operation. The pre-cooling unit is used to identify whether the coolant pressure is within the allowable fluctuation range of the pressure control valve setting. If the coolant pressure is lower than the lower limit of the pressure range, the automatic water replenishment device is activated to start replenishing water. If the coolant pressure rises sharply, the pressure relief valve is opened in stages. The precooling termination unit is used to preset a precooling effectiveness threshold; determine whether the preset precooling effectiveness at the current time of the precooling operation is less than or equal to the precooling effectiveness threshold; if so, gradually increase the pressure control valve setting value to the rated range and end the precooling operation.

7. The pressure regulation system of the wind turbine water cooling system according to claim 6, characterized in that, The target cooling temperature is set based on the internal temperature at the start of the precooling operation and the precoolable range, including: Calculate the average internal temperature at all monitoring points at the start of the precooling operation; The precoolable temperature value is obtained based on the average internal temperature and the precoolable range. The target cooling temperature is obtained by combining the target cooling temperature with the average internal temperature.

8. The pressure regulation system of the wind turbine water cooling system according to claim 1, characterized in that, The data acquisition module is configured to deploy temperature sensors at the heat exchange contact surfaces between the wind turbine water cooling system and various components to obtain the internal temperature at multiple monitoring points.

9. An automatic water replenishment device for a wind turbine water-cooling system, characterized in that, The device includes: a water tank, a water pump, a water pipeline, and a water controller. The water controller is signal-connected to the pressure regulation system according to any one of claims 1 to 8 and can automatically detect changes in coolant pressure in the pressure regulation system and replenish the coolant.

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