Automatic water supplementing device and pressure adjusting system of wind driven generator water cooling system

Abstract

The invention relates to the technical field of automatic adjustment, in particular to an automatic water supplementing device and a pressure adjusting system of a wind driven generator water cooling system.The pressure adjusting system evaluates the current power generation environment where a wind driven generator is located by arranging a heat dissipation effectiveness analysis module, and the external heat dissipation condition of the wind driven generator is judged; a pre-cooling amplitude acquisition module, a water cooling system starting module and a pre-cooling effectiveness analysis module are arranged, the output stability of the generator under the current external heat dissipation condition is further evaluated, the cooling load of the generator under the current working state is judged, and self-adaptive monitoring of the cooling effect is achieved; and a pressure adjusting module is arranged, self-adaptive control over the pressure of the cooling liquid is achieved according to the temperature change trend generated by the pre-cooling operation, and stable operation of the wind driven generator is guaranteed. The automatic water replenishing device is in signal connection with the pressure regulating system, automatically detects the pressure change of the cooling liquid and replenishes the liquid, so that the pressure stability of the cooling liquid in the circulating cooling pipeline is effectively maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic regulation, and in particular to an automatic water replenishing device and a pressure regulating system for a water cooling system of a wind turbine generator. Background Art

[0002] In recent years, with the gradual increase in the power of wind turbine generator sets (referred to as wind turbines), and the increasing integration of electronic devices in wind turbines, and the reduction in overall volume, that is, the number of devices per unit volume has increased, such as IGBTs, filter capacitors, pitch motors, etc., resulting in increasingly dense integrated heat flows around wind turbines; therefore, under the dual requirements of wind turbine power and integration, wind turbines generate more heat, and the pressure on heat dissipation increases, which requires that the performance requirements for water cooling systems also be improved.

[0003] Existing technologies typically control the flow of coolant in water-cooling systems by presetting water pressure, achieving basic regulation of coolant flow. However, the rapidly changing environment in which wind turbines operate requires greater power output from blades, placing greater demands on hardware such as the converter. This leads to increased heat dissipation from the wind turbine. Simply using existing cooling systems can result in poor heat dissipation, leading to component overheating and potentially impacting wind turbine stability.

[0004] To address the problem of poor heat removal from wind turbines, existing technologies use an automatic water replenishment device combined with a pressure regulation system to sense the dynamic conditions of the wind turbine's output and perform targeted coolant pressure control based on the output results under the wind turbine's dynamic conditions. However, abnormal factors such as the strong randomness of wind speed impacts and the susceptibility of wind speed to interference in the wind environment in which the wind turbine is located can interfere with the real-time operation of the wind turbine, resulting in greater differences between the wind turbine's output states. If the coolant pressure is adjusted by directly using the output state and the rate of conversion between other states, the conversion process between states will be more unstable and the required cooling states will also be different. Therefore, it is necessary to optimize the scheduling between cooling states to ensure the stable operation of the wind turbine. Summary of the Invention

[0005] In order to solve the above technical problems, the object of the present invention is to provide an automatic water replenishing device and a pressure regulating system for a water cooling system of a wind turbine.

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

[0007] A pressure regulating system for a water cooling system of a wind turbine generator, comprising:

[0008] A data acquisition module is used to obtain the output power of the wind turbine and the internal temperature and external ambient temperature at multiple monitoring points of the wind turbine water cooling system in real time;

[0009] a heat dissipation effectiveness analysis module, configured to analyze a heat exchange trend of the wind turbine according to the internal temperature and the external ambient temperature, and obtain the heat dissipation effectiveness of the wind turbine at each moment in combination with the output power;

[0010] a pre-cooling range acquisition module, configured to analyze an environmental condition index for pre-cooling of the wind turbine generator based on the heat dissipation effectiveness, and obtain the pre-cooling range of the wind turbine generator at a current moment by combining the internal temperature and the external ambient temperature;

[0011] A water cooling system starting module, configured to start the water cooling system and perform a pre-cooling operation according to the pre-cooling amplitude;

[0012] a pre-cooling effectiveness analysis module, configured to obtain the pre-cooling effectiveness at each moment during the pre-cooling operation according to the heat dissipation effectiveness and the pre-cooling range;

[0013] The pressure regulating module is used to perform adaptive control of the cooling fluid pressure during the precooling operation according to the internal temperature and the precooling range, combined with 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] a heat exchange trend analysis unit, configured to analyze the degree of temperature difference between the internal temperature and the external ambient temperature at each monitoring point at each moment, and to analyze the degree of dispersion of the internal temperature at all monitoring points at each moment, to obtain a heat exchange trend index of the wind turbine at each moment;

[0016] a heat generation capability analysis unit, configured to analyze the relationship between the output power and the output rated power at each moment, and obtain a heat generation capability index of the wind turbine at each moment;

[0017] The heat dissipation effectiveness obtaining unit is used to obtain the heat dissipation effectiveness of the wind turbine at each moment by combining the heat exchange trend index and the heat generation capacity index.

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

[0019] An environmental condition index analysis unit, configured to analyze the magnitude relationship between the heat dissipation effectiveness at a current moment and at a previous moment, and obtain an environmental condition index for pre-cooling of the wind turbine at a current moment;

[0020] a cooling space index analysis unit, configured to analyze the difference between the mean of the internal temperature at all monitoring points at the current moment and the external ambient temperature, and obtain a cooling space index for pre-cooling of the wind turbine at the current moment;

[0021] The pre-cooling range obtaining unit is used to obtain the pre-cooling range of the wind turbine at the current moment by combining the environmental condition index and the cooling space index.

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

[0023] Determining whether the pre-cooling range is greater than 0;

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

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

[0026] a heat dissipation stability index analysis unit, configured to analyze the difference between the heat dissipation effectiveness at the time the pre-cooling operation is currently being performed and at the time the pre-cooling operation is started, and obtain a heat dissipation stability index at each moment during the pre-cooling operation;

[0027] a temperature stability index analysis unit, configured to analyze, based on the pre-cooling range, a temperature stability trend between the pre-cooling operation process moment and the pre-cooling operation start moment, and obtain a temperature stability index at each moment during the pre-cooling operation process, wherein the pre-cooling operation process moment is all moments between the pre-cooling operation start moment and the pre-cooling operation currently in progress;

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

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

[0030] The difference between the average value of the pre-cooling amplitude at all moments of the pre-cooling operation process and the pre-cooling amplitude at the start of the pre-cooling operation is analyzed to obtain the temperature stability index at each moment of the pre-cooling operation process.

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

[0032] a precooling starting unit, configured to set a cooling target temperature based on the internal temperature and the precooling range at the start of the precooling operation, and use the precooling effectiveness at each moment during the precooling operation as a global weight of a PID controller at the next moment, and in combination with the temperature monitoring value at the current moment of the precooling operation, output by the PID controller a set value for adjusting the pressure control valve at the next moment;

[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 value; 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 suddenly rises, the pressure relief valve is opened in stages;

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

[0035] In some embodiments of the present invention, setting the cooling target temperature according to the internal temperature at the start of the pre-cooling operation and the pre-cooling range includes:

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

[0037] According to the mean value of the internal temperature and the pre-cooling range, the pre-cooling temperature value is obtained;

[0038] The cooling target temperature is obtained according to the cooling target temperature and combined with the average value of the 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 internal temperatures at multiple monitoring points.

[0040] According to a second aspect of an embodiment of the present invention, an automatic water replenishment device for a water cooling system of a wind turbine 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 described in any one of the first aspect of the embodiment 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 the prior art, the automatic water replenishing device and pressure regulating system of the wind turbine water cooling system provided by the present invention have the following beneficial effects:

[0042] The pressure regulating system of the application collects the output power of the wind turbine and the internal and external temperature through the data acquisition module, thereby providing data basis for subsequent analysis; the heat dissipation effectiveness analysis module is arranged to evaluate the power generation environment where the wind turbine is located, analyze the heat exchange trend of the wind turbine, and judge the external heat dissipation condition; the precooling amplitude acquisition module, the water cooling system starting module and the precooling effectiveness analysis module are arranged to analyze the precooling amplitude of the wind turbine, thereby performing precooling operation, and analyzing the precooling effectiveness at each moment in the precooling operation process, further evaluating the output stability of the generator under the current external heat dissipation condition, judging the cooling load caused by the generator under the current working state, thereby realizing adaptive monitoring of the cooling process; the pressure regulating module is arranged to realize adaptive control of the cooling liquid pressure in the precooling operation starting process and the end stage through the temperature variation trend generated by the precooling operation, thereby guaranteeing the stable operation of the wind turbine. The automatic water supplementing device of the application is signal connected with the pressure regulating system, automatically detects the change of the cooling liquid pressure and supplements liquid, thereby effectively maintaining the pressure stability of the cooling liquid in the circulating cooling pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art and the advantages thereof, a brief introduction will be given to the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0044] Figure 1 The basic component schematic diagram of the pressure regulating system of the water cooling system of the wind turbine provided by one embodiment of the application;

[0045] Figure 2 The basic component schematic diagram of the automatic water supplementing device of the water cooling system of the wind turbine provided by one embodiment of the application. DETAILED DESCRIPTION

[0046] In order to further illustrate the technical means and effects adopted by the application to achieve the predetermined application purpose, the automatic water supplementing device and the pressure regulating system of the water cooling system of the wind turbine according to the application are described in detail below in combination with the drawings and the preferred embodiments, the specific implementation, structure, features and effects thereof are described as follows. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the 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 those skilled in the art to which this invention pertains. Terms such as "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a circuit structure, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of further limitations, the phrase "comprising a ..." to define an element does not preclude the presence of other identical elements in the article or device comprising the element.

[0048] The specific scheme of the pressure regulating system of the water cooling system of a wind turbine generator provided by the present invention is described in detail below with reference to the accompanying drawings.

[0049] See also Figure 1 , which shows the basic composition of a pressure regulating system of a wind turbine water cooling system provided by one embodiment of the present invention.

[0050] like Figure 1 As shown, one embodiment of the present invention provides a pressure regulation system for a water cooling system of a wind turbine, specifically comprising: a data acquisition module 10, a heat dissipation effectiveness analysis module 20, a pre-cooling range acquisition module 30, a water cooling system startup module 40, a pre-cooling 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 pre-cooling range acquisition module 30 includes an environmental condition index analysis unit 31, a cooling space index analysis unit 32, and a pre-cooling range acquisition unit 33. The pre-cooling effectiveness analysis module 50 includes a heat dissipation stability index analysis unit 51, a temperature stability index analysis unit 52, and a pre-cooling effectiveness acquisition unit 53.

[0051] The data acquisition module is configured to obtain real-time data on the wind turbine's output power, as well as the internal and external ambient temperatures at multiple monitoring points within the wind turbine's water cooling system. Furthermore, the data acquisition module is configured to deploy temperature sensors at the heat exchange interface between the wind turbine's water cooling system and various components to obtain real-time internal temperature data at these multiple monitoring points. Temperature sensors are also installed on the outside of the wind turbine to obtain real-time data on the wind turbine's external ambient temperature. This data acquisition module also obtains real-time current and voltage values ​​at the wind turbine's power output terminal, thereby obtaining real-time data on the wind turbine's output power.

[0052] The output environment of wind turbines depends on stable wind resources, but the generation of wind resources is highly random, and thus has the characteristic of poor output sustainability; therefore, the water cooling system has different cooling load processing requirements at different cooling load stages. First, it is necessary to identify the output fluctuations of the wind turbine and evaluate the cooling load based on the trend of the wind turbine output fluctuations. The wind turbine state can then be further distinguished based on the stability of the cooling load. Finally, the conversion rate between wind turbine states can be used to provide the timing and degree of adjustment for the water cooling system to perform pressure adjustment control, so as to meet the cooling needs of the wind turbine under different states.

[0053] Based on the above analysis, in an embodiment 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 a heat dissipation effectiveness analysis module, a pre-cooling amplitude acquisition module, a water cooling system startup module, and a 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 combine it with the output power to obtain the heat dissipation effectiveness of the wind turbine at each moment. Furthermore, 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 turbine heat dissipation relies on a water cooling system. This system releases heat from the wind turbine by dissipating heat at the locations where the coolant contacts components. This heat is then carried through pipelines to a heat exchanger, which cools the wind turbine components by bringing the high-temperature coolant into contact with the low-temperature external environment. Therefore, by determining the thermal differences between the coolant's contact points with various components and the external ambient temperature, the effectiveness of external heat dissipation conditions can be assessed. When external heat dissipation is efficient, the coolant's heat can be released more easily.

[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 temperature difference between the internal temperature and the external ambient temperature at each monitoring point at each moment, and to analyze the dispersion of the internal temperature at all detection points at each moment, so as to obtain the heat exchange trend index of the wind turbine at each moment.

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

[0058] Finally, a heat dissipation effectiveness acquisition unit is set in the heat dissipation effectiveness analysis module 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. The heat dissipation effectiveness calculation formula of the wind turbine at time t is:

[0059]

[0060] Where y t represents the heat dissipation effectiveness of the wind turbine at time t; w max Indicates the rated output power of the wind turbine; w t represents the output power of the wind turbine at time t; n a Indicates the number of temperature monitoring points at the internal device locations of the wind turbine (the number of temperature sensors installed inside the wind turbine); T a,t represents the internal temperature of the temperature monitoring point a in the wind turbine at time t (the monitoring temperature of the temperature sensor installed at the temperature monitoring point a); T out,t represents the external ambient temperature of the wind turbine at time t (the temperature monitored by the temperature sensor installed outside the wind turbine); represents the standard deviation of the internal temperature at all monitoring points of the internal components of the wind turbine; norm represents the linear normalization function; +0.1 is to prevent the denominator from being zero.

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

[0062] At time t, the temperature sensor at each temperature monitoring point a in the wind turbine monitors the internal temperature T a,t and external ambient temperature T out,t The difference between the internal temperature at each temperature monitoring point a and 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 each moment. The larger the value of this formula, the higher the device temperature and the higher the heat exchange trend. It is easier for the current device position to carry away the heat generated by the current device through the flow of coolant. At the same time, the denominator position judges the heat carrying effectiveness of the coolant through the temperature deviation between devices, that is, the coolant will not spread the heat of the high-temperature device to other device positions due to flowing in the pipeline.

[0063] By traversing the positions of each device, the overall heat dissipation effectiveness of the wind turbine at time t is obtained. Furthermore, based on the monitoring parameters obtained in real time, the heat dissipation effectiveness of the wind turbine at each time is obtained.

[0064] The pre-cooling range acquisition module is used to analyze the environmental condition index of wind turbine pre-cooling according to the heat dissipation effectiveness, and obtain the pre-cooling range of the wind turbine at the current moment by combining the internal temperature and the external ambient temperature.

[0065] When output power is high (heat generation is high) and heat dissipation conditions are favorable, slight overcooling (within a safe upper limit) or activation of additional cooling capacity (such as backup fans) is permitted. This is equivalent to utilizing surplus power to reduce the wind turbine's temperature to a level below the normal operating setpoint when "wind is strong and electricity is abundant" and grid demand is low, thereby conserving "cold" (reflected in the thermal capacity of the wind turbine components and the cooling medium). Therefore, by providing a module for obtaining the available precooling range, the wind turbine's precooling environmental condition index is analyzed based on heat dissipation effectiveness, and the internal and external ambient temperatures are combined to determine the available precooling range for the wind turbine at the current moment.

[0066] Starting from the current moment, the higher the heat dissipation effectiveness and the longer the heat dissipation effectiveness remains high, the smaller the fluctuation in the high-efficiency range, which means that more cold capacity can be stored at present. Therefore, the pre-cooling intensity should be higher, thereby providing the wind turbine with a temperature closer to the external environment, and making it more difficult for the heat caused by the fluctuation of the wind turbine output load to cause abnormal changes in the heat dissipation conditions in a short time, reflecting that the stability of the current wind turbine output power is more controllable and the output environment is more normal.

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

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

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

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

[0071]

[0072] Where, Indicates the pre-cooling range of the wind turbine at the current time t0; represents the mean internal temperature of all temperature monitoring points in the wind turbine at the current time t0; Indicates the external ambient temperature of the wind turbine at the current time t0; Indicates the heat dissipation effectiveness of the wind turbine at the current time t0; It indicates the heat dissipation effectiveness of the wind turbine at time t0-1 (the moment before the current moment t0); softsign represents a nonlinear normalization function, and the normalized value range is (-1, 1).

[0073] The average internal temperature of all temperature monitoring points at the current time t0 and external ambient temperature The difference between the two represents the cooling space index of the wind turbine pre-cooling at the current moment. This formula reflects the temperature difference of the wind turbine during operation. The greater the temperature difference, the more heat the device can dissipate to the outside world at the current moment t0. Therefore, the larger the pre-cooling range, the greater the space for temperature reduction, and the more significantly the temperature rise can be suppressed after pre-cooling.

[0074] is the ratio of the heat dissipation effectiveness at the current moment t0 to the previous moment t0-1 The difference between t0 and 1 / 2 indicates the environmental condition index of wind turbine pre-cooling at the current moment. The larger the value of this formula, the higher the heat dissipation effectiveness at the current moment is than that at the previous moment, reflecting that the temperature environment outside the wind turbine at the current moment and the heat generation environment of the wind turbine components themselves are closer, so it can provide 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 it is greater than 1, a larger pre-cooling amplitude can be provided; further, -1 / 2 is used to ensure that the pre-cooling amplitude is maintained within a stable range, avoiding the pre-cooling target temperature being lower than the external temperature, increasing the power consumption of the water cooling system, and causing 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 pre-cooling operations based on the pre-cooling range. Specifically, the water cooling system startup module is configured to determine whether the pre-cooling range is greater than 0; if so, send a water cooling system startup signal to control the water cooling system to start and perform pre-cooling operations; if not, do not perform pre-cooling operations.

[0076] The pre-cooling effectiveness analysis module is used to obtain the pre-cooling effectiveness at each moment during the pre-cooling operation according to the heat dissipation effectiveness and the pre-cooling range.

[0077] After executing a precooling operation, a precooling effectiveness analysis module is set up to evaluate the effectiveness of the precooling operation at the current moment. If the wind turbine's thermal state deflection (poorer heat dissipation) is greater during the first period after a single precooling operation (i.e., the thermal state of the wind turbine is deviating), the precooling amplitude between the start time and the current precooling operation is offset, and the heat dissipation effectiveness increases more slowly and the interval is shorter, this indicates that the precooling operation has a limited effect on improving the efficiency of the wind turbine's water cooling system. Therefore, the precooling effectiveness of the precooling operation is evaluated at any moment after the precooling operation is executed.

[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 between the heat dissipation effectiveness at the current moment of the pre-cooling operation and the moment when the pre-cooling operation starts, and obtain the heat dissipation stability index at each moment during the pre-cooling operation.

[0080] The temperature stability index analysis unit is configured to analyze the temperature stability trend between the pre-cooling operation process and the start time of the pre-cooling operation based on the pre-cooling range, and obtain the temperature stability index at each time point during the pre-cooling operation. The pre-cooling operation process time points are all times between the start time of the pre-cooling operation and the time when the pre-cooling operation is currently in progress. More specifically, the temperature stability index analysis unit is configured to analyze the difference between the average of the pre-cooling range at all pre-cooling operation process times and the pre-cooling range at the start time of the pre-cooling operation, and obtain the temperature stability index at each time point during the pre-cooling operation.

[0081] The pre-cooling effectiveness acquisition unit is used to combine the heat dissipation stability index and the temperature stability index to obtain the pre-cooling effectiveness at each moment during the pre-cooling operation. ′ The calculation formula for precooling effectiveness is:

[0082]

[0083] Where, v k,t′ represents the pre-cooling effectiveness at the time t′ of the current pre-cooling operation k; y k,t′ represents the heat dissipation effectiveness of the wind turbine at the time t′ when the pre-cooling operation k is currently being performed; represents the time t at which the wind turbine starts pre-cooling operation k k The heat dissipation effectiveness at t; t′ represents the current time of pre-cooling operation k; tk Precooling operation k starts at the moment; represents the start time t of the pre-cooling operation k k The pre-cooling range of wind turbines; represents the start time t of the pre-cooling operation k k To the time t at which the precooling operation k is currently being performed ′ The sum of the pre-cooling amplitudes of the wind turbine at all moments between (including the start and the current moment); norm represents a linear normalization function.

[0084] is the heat dissipation effectiveness y corresponding to the current time t′ of pre-cooling operation k k,t′ The pre-cooling operation k starts at time t k Heat dissipation effectiveness The difference between the two represents the heat dissipation stability index at the time t′ when the pre-cooling operation k is currently being performed. The larger the difference, the more stable the overall temperature environment of the wind turbine is during the pre-cooling operation k compared to the time when the pre-cooling operation k starts, indicating that the pre-cooling operation is more effective; and the difference is made non-negative by +1.

[0085] is the starting time t of precooling operation k k The average value of the precooling amplitude at all times between the time t' and the time t at which the precooling operation starts k The absolute value of the difference in the precooling amplitude of the wind turbine represents the temperature stability index at the current time t′ of the precooling operation k. The larger the value of this formula, the less obvious the temperature fluctuation during the current precooling operation. That is, by the end of the current time t′, the temperature anomaly of the device caused by the precooling operation is more stable than when the precooling operation started, which further indicates that the precooling operation is more effective by the current time t′.

[0086] Therefore, starting from the moment the pre-cooling operation starts, the pre-cooling effectiveness at each moment during the pre-cooling operation is monitored in real time, thereby achieving adaptive monitoring of the cooling process.

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

[0088] The pressure regulating module is used to adaptively control the cooling fluid pressure during the pre-cooling operation based on the internal temperature and the pre-cooling range, combined with the pre-cooling effectiveness at the current moment of the pre-cooling operation. Furthermore, the pressure regulating module includes a pre-cooling start unit, a pre-cooling start unit, and a pre-cooling end unit. Specifically:

[0089] The pre-cooling start unit is used to set the cooling target temperature according to the internal temperature at the start of the pre-cooling operation and the pre-cooling range. More specifically, the mean of the internal temperature at all monitoring points at the start of the pre-cooling operation is calculated, which is recorded as According to the mean internal temperature Precooling range The precooling temperature is Then the cooling target temperature is set to The effectiveness of pre-cooling at each moment during the pre-cooling operation is used as the global weight of the PID controller at the next moment (the weight is set to 1 at the first moment), and combined with the temperature monitoring value at the current moment of the pre-cooling operation, the PID controller outputs the pressure control valve set point for the next moment. It should be noted that the set point of the actual cooling target temperature relaxes the lower pressure limit (for example, from 1.5 bar to 1.0 bar); this can effectively adapt to the natural drop in system pressure caused by the shrinkage of the coolant volume, avoid false triggering of the safety valve, reduce pump power consumption, and improve pre-cooling energy 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 value; if the coolant pressure is lower than the lower limit of the pressure range, the automatic water replenishment device is started to replenish water, and the nitrogen pressurizing device is started to replenish air to the expansion tank air chamber; if the coolant pressure rises suddenly, the pressure relief valve is opened in stages; it can prevent cavitation or pipeline deformation while expanding the pressure fluctuation range.

[0091] The pre-cooling end unit is used to preset the pre-cooling effectiveness threshold, which can be set to 0.3; it determines whether the preset pre-cooling effectiveness at the current moment of the pre-cooling operation is less than or equal to the pre-cooling effectiveness threshold; if so, it is determined that the pre-cooling operation effect is poor, and the pre-cooling operation of the wind turbine should be stopped at this time, and the pressure control valve setting value is gradually increased to the rated range (such as 1.5±0.2bar) to end the pre-cooling operation; it can provide stable heat dissipation guarantee for subsequent high-power operation to avoid bubble precipitation.

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

[0093] See also Figure 2 , which shows the basic composition of an automatic water replenishing device for a water cooling system of a wind turbine provided by 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 signal-connected to a pressure regulation system 5 and can automatically detect changes in coolant pressure in the pressure regulation system 5 and replenish the coolant. This effectively maintains the stable pressure of the liquid in the circulating cooling pipeline. For example, the expansion tank and pressure control unit work together to automatically activate when the coolant pressure falls below a calibrated value (the pressure in the pipeline at normal coolant capacity), indicating a decrease in coolant due to leakage or evaporation.

[0095] The water cooling system of a wind turbine is part of the cooling system of the wind turbine to cope with output state fluctuations caused by sudden changes in wind speed; the automatic water replenishment device can replenish coolant to the water cooling system in real time, adjust the cooling fluid pressure, and prevent pressure drops due to 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 in which the embodiments of the present invention are described above is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain 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, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

Claims

1. A pressure regulating system for a water cooling system of a wind turbine generator, characterized in that: The system comprises: A data acquisition module is used to obtain the output power of the wind turbine and the internal temperature and external ambient temperature at multiple monitoring points of the wind turbine water cooling system in real time; a heat dissipation effectiveness analysis module, configured to analyze a heat exchange trend of the wind turbine according to the internal temperature and the external ambient temperature, and obtain the heat dissipation effectiveness of the wind turbine at each moment in combination with the output power; a pre-cooling range acquisition module, configured to analyze an environmental condition index for pre-cooling of the wind turbine generator based on the heat dissipation effectiveness, and obtain the pre-cooling range of the wind turbine generator at a current moment by combining the internal temperature and the external ambient temperature; A water cooling system starting module, configured to start the water cooling system and perform a pre-cooling operation according to the pre-cooling amplitude; a pre-cooling effectiveness analysis module, configured to obtain the pre-cooling effectiveness at each moment during the pre-cooling operation according to the heat dissipation effectiveness and the pre-cooling range; The pressure regulating module is used to perform adaptive control of the cooling fluid pressure during the precooling operation according to the internal temperature and the precooling range, combined with the precooling effectiveness at the current moment of the precooling operation.

2. The pressure regulating system of the wind turbine water cooling system according to claim 1, characterized in that: The heat dissipation effectiveness analysis module includes: a heat exchange trend analysis unit, configured to analyze the degree of temperature difference between the internal temperature and the external ambient temperature at each monitoring point at each moment, and to analyze the degree of dispersion of the internal temperature at all monitoring points at each moment, to obtain a heat exchange trend index of the wind turbine at each moment; a heat generation capability analysis unit, configured to analyze the relationship between the output power and the output rated power at each moment, and obtain a heat generation capability index of the wind turbine at each moment; The heat dissipation effectiveness obtaining unit is used to obtain the heat dissipation effectiveness of the wind turbine at each moment by combining the heat exchange trend index and the heat generation capacity index.

3. The pressure regulating system of the wind turbine water cooling system according to claim 1, characterized in that: The pre-cooling amplitude acquisition module includes: An environmental condition index analysis unit, configured to analyze the magnitude relationship between the heat dissipation effectiveness at a current moment and at a previous moment, and obtain an environmental condition index for pre-cooling of the wind turbine at a current moment; a cooling space index analysis unit, configured to analyze the difference between the mean of the internal temperature at all monitoring points at the current moment and the external ambient temperature, and obtain a cooling space index for pre-cooling of the wind turbine at the current moment; The pre-cooling range obtaining unit is used to obtain the pre-cooling range of the wind turbine at the current moment by combining the environmental condition index and the cooling space index.

4. The pressure regulating 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: Determining whether the pre-cooling range is greater than 0; If yes, a water cooling system start signal is sent to control the water cooling system to start and perform a pre-cooling operation.

5. The pressure regulating system of the wind turbine water cooling system according to claim 1, characterized in that: The pre-cooling effectiveness analysis module includes: a heat dissipation stability index analysis unit, configured to analyze the difference between the heat dissipation effectiveness at the time the pre-cooling operation is currently being performed and at the time the pre-cooling operation is started, and obtain a heat dissipation stability index at each moment during the pre-cooling operation; a temperature stability index analysis unit, configured to analyze, based on the pre-cooling range, a temperature stability trend between the pre-cooling operation process moment and the pre-cooling operation start moment, and obtain a temperature stability index at each moment during the pre-cooling operation process, wherein the pre-cooling operation process moment is all moments between the pre-cooling operation start moment and the pre-cooling operation currently in progress; The pre-cooling effectiveness obtaining unit is used to combine the heat dissipation stability index and the temperature stability index to obtain the pre-cooling effectiveness at each moment during the pre-cooling operation.

6. The pressure regulating system of the wind turbine water cooling system according to claim 5, characterized in that: The temperature stability index analysis unit is configured to: The difference between the average value of the pre-cooling amplitude at all moments of the pre-cooling operation process and the pre-cooling amplitude at the start of the pre-cooling operation is analyzed to obtain the temperature stability index at each moment of the pre-cooling operation process.

7. The pressure regulating system of the wind turbine water cooling system according to claim 1, characterized in that: The pressure regulating module comprises: a precooling starting unit, configured to set a cooling target temperature based on the internal temperature and the precooling range at the start of the precooling operation, and use the precooling effectiveness at each moment during the precooling operation as a global weight of a PID controller at the next moment, and in combination with the temperature monitoring value at the current moment of the precooling operation, output by the PID controller a set value for adjusting the pressure control valve at the next moment; The pre-cooling unit is used to identify whether the coolant pressure is within the allowable fluctuation range of the pressure control valve setting value; 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 suddenly rises, the pressure relief valve is opened in stages; The pre-cooling end unit is used to preset a pre-cooling effectiveness threshold; determine whether the preset pre-cooling effectiveness at the current moment of the pre-cooling operation is less than or equal to the pre-cooling effectiveness threshold; if so, gradually increase the pressure control valve setting value to the rated range to end the pre-cooling operation.

8. The pressure regulating system of the wind turbine water cooling system according to claim 7, characterized in that: Setting a cooling target temperature according to the internal temperature at the start time of the pre-cooling operation and the pre-cooling range includes: Calculate the mean internal temperature at all monitoring points at the start of the precooling operation; According to the mean value of the internal temperature and the pre-cooling range, the pre-cooling temperature value is obtained; The cooling target temperature is obtained according to the cooling target temperature and combined with the average value of the internal temperature.

9. The pressure regulating 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 internal temperatures at multiple monitoring points.

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

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