Recoverable explosion-proof capacitor temperature control method and system

Abstract

The invention relates to the field of capacitor temperature control, in particular to a recoverable explosion-proof capacitor temperature control method and system, and the method comprises the steps: determining a processing mode according to a temperature characterization coefficient and a heat dissipation characterization coefficient, and carrying out the adjustment processing of a cooling device or the analysis processing of an operation behavior; determining a driving state according to the speed change reference value and the direction change reference value; determining an adjusting mode according to the driving state to carry out harmonic detection adjustment according to the driving parameters; according to the harmonic amplitude and the harmonic discrete coefficient of the target section, determining that the cooling mode of the refrigeration device is a water-cooling cooling mode or a circulating cooling mode; the problem that the temperature control effect is poor due to the fact that the temperature control method cannot effectively adapt to the dynamic driving state is considered, and the temperature control effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power distribution capacitor temperature control, in particular to a recoverable explosion-proof capacitor temperature control method and system. BACKGROUND

[0002] With the rapid development of new energy automobile industry, capacitors play a key role in the fields of automobile electric drive system and energy recovery due to their high power density and fast charging and discharging characteristics. Among them, temperature control is the core technology to ensure the stable operation of capacitors in complex vehicle environment, and the control accuracy directly affects the performance degradation rate of capacitors and the safety of the whole vehicle. However, the existing temperature control technology often fails to effectively adapt to the dynamic driving state when dealing with the changeable driving state, resulting in poor temperature control effect. Therefore, how to realize accurate monitoring and dynamic regulation of capacitor temperature under complex and variable vehicle working conditions is a key technical problem to be solved by those skilled in the art.

[0003] Chinese patent publication No. CN111245084A discloses a kind of based on CAN bus's impact current hybrid power device and control method, contain: including by insulated gate bipolar transistor, rectifier diode, capacitor, adjustable resistance and current detection module constitute impact capacitor module, by battery, insulated gate bipolar transistor and current detection module constitute battery module and by microcontroller constitutes main control module;Main control module input comes from two current detection modules, and vehicle real-time driving data obtained by can bus, control the on-off of each insulated gate bipolar transistor and the size of variable resistance by output. Vehicle driving data is analyzed by microcontroller, combined with driving intention, operating state and working condition, control capacitor charging and discharging, provide larger current by capacitor, ensure vehicle stable driving. It can be seen from the above technical solution that the above technical solution has the following problems: although the influence of vehicle driving state on capacitor charging and discharging is considered, the adaptability of temperature control method is poor due to the influence of driving state on capacitor temperature, and the temperature control precision is low. SUMMARY

[0004] Therefore, the present application provides a recoverable explosion-proof capacitor temperature control method and system to overcome the problem that the adaptability of temperature control method is poor due to the influence of driving state on capacitor temperature, and the temperature control precision is low.

[0005] To achieve the above purpose, the present application provides a recoverable explosion-proof capacitor temperature control method, comprising:

[0006] Determining the processing mode according to the temperature characteristic coefficient and the heat dissipation characteristic coefficient, which is adjusting the cooling device or analyzing the operation behavior;

[0007] In the adjusting process of the cooling device, the power of the cooling device is determined according to the difference between the heat dissipation characteristic coefficients;

[0008] In the analyzing process of the operation behavior, the driving state is determined according to the speed change reference value and the direction change reference value, and whether to perform the harmonic detection adjustment according to the driving parameter is determined according to the driving state;

[0009] In the harmonic detection adjustment, the attention moment is determined based on the driving parameter, and the sampling strategy is determined according to the balance coefficient of the attention moment, which is increasing adjustment for the sampling frequency or dynamic adjustment for the sampling window;

[0010] Under the collection completion condition, the harmonic performance state is determined according to the harmonic amplitude and the harmonic dispersion coefficient of the target paragraph, and the cooling mode of the refrigeration device is determined according to the harmonic performance state, which is a water cooling mode or a circulating cooling mode, and when the cooling mode is the circulating cooling mode, the cycle length ratio is determined according to the effective harmonic difference value.

[0011] Further, the processing mode is determined according to the temperature characteristic coefficient and the heat dissipation characteristic coefficient;

[0012] If the temperature characteristic coefficient is greater than the preset temperature characteristic coefficient and the heat dissipation characteristic coefficient is less than or equal to the preset heat dissipation characteristic coefficient, the processing mode is adjusting the cooling device;

[0013] If the temperature characteristic coefficient is less than or equal to the preset temperature characteristic coefficient or the heat dissipation characteristic coefficient is greater than the preset heat dissipation characteristic coefficient, the processing mode is analyzing the operation behavior.

[0014] Further, in the adjusting process of the cooling device, the power of the cooling device is determined according to the difference between the heat dissipation characteristic coefficients;

[0015] The power of the cooling device and the difference between the heat dissipation characteristic coefficients are in a negative correlation relationship.

[0016] Further, in the analyzing process of the operation behavior, if the driving state is that the speed change reference value is greater than the preset speed change reference value and the direction change reference value is greater than the preset direction change reference value, the harmonic detection adjustment is performed according to the driving parameter.

[0017] Further, in the harmonic detection adjustment, the attention moment is determined based on the driving parameter, and the sampling strategy is determined according to the comparison result of the balance coefficient of the attention moment and the preset balance coefficient;

[0018] If the balance coefficient of the attention moment is greater than the preset balance coefficient, the sampling strategy is increasing adjustment for the sampling frequency;

[0019] If the equalization coefficient at the time of interest is less than or equal to the preset equalization coefficient, the sampling strategy is to dynamically adjust the sampling window.

[0020] Furthermore, when increasing the sampling frequency, the sampling frequency is increased according to the effective difference;

[0021] The sampling frequency and the effective difference are positively correlated;

[0022] The effective difference is the maximum value of the speed change difference and the direction change difference.

[0023] Furthermore, when dynamically adjusting the sampling window, the paragraph category is determined based on the density of the focused moments, and the adjustment method is determined based on the paragraph category;

[0024] If the paragraph category is a paragraph whose density at the focus moment is greater than the preset density, the adjustment method is to perform transient focus sampling adjustment;

[0025] If the paragraph category is a second-category paragraph whose density of the focus moments is less than or equal to the preset density, the adjustment method is to increase the window length.

[0026] Furthermore, based on the acquisition completion condition, the harmonic performance state is determined according to the harmonic amplitude and harmonic dispersion coefficient of the target section, and the cooling method of the refrigeration device is determined according to the harmonic performance state;

[0027] If the harmonic manifestation state is the first manifestation state in which the harmonic amplitude is greater than the preset harmonic amplitude and the harmonic dispersion coefficient is greater than the preset harmonic dispersion coefficient, the cooling method is the water cooling method;

[0028] If the harmonic manifestation state is the second manifestation state in which the harmonic amplitude is less than or equal to the preset harmonic amplitude or the harmonic dispersion coefficient is less than or equal to the preset harmonic dispersion coefficient, the cooling mode is the cyclic cooling mode;

[0029] The collection completion condition is that the paragraph category is determined and data collection is completed.

[0030] Furthermore, when the cooling method is a cyclic cooling method, the cycle duration ratio is determined according to the effective harmonic difference;

[0031] If the effective harmonic difference is less than the preset effective harmonic difference, the cycle duration ratio is the benchmark cycle duration ratio;

[0032] If the effective harmonic difference is greater than or equal to the preset effective harmonic difference, the cycle duration ratio is a value obtained by adaptively adjusting the benchmark cycle duration ratio.

[0033] The present invention also provides a system applying the recoverable explosion-proof capacitor temperature control method, comprising:

[0034] The data acquisition unit comprises a plurality of data acquisition devices for acquiring monitoring data.

[0035] The analysis processing unit is connected with the data acquisition unit, and is used for determining a processing mode according to the temperature characteristic coefficient and the heat dissipation characteristic coefficient, wherein the processing mode is adjustment processing on the cooling device or analysis processing on the operation behavior.

[0036] The adjustment processing unit is connected with the data acquisition unit and the analysis unit respectively, and is used for determining the power of the cooling device according to the heat dissipation characteristic coefficient difference when the adjustment processing on the cooling device is performed, determining the driving state according to the speed change reference value and the direction change reference value when the analysis processing on the operation behavior is performed, and determining whether to perform harmonic detection adjustment according to the driving parameter according to the driving state.

[0037] The sampling decision unit is connected with the data acquisition unit, the analysis processing unit and the adjustment processing unit respectively, and is used for determining an attention moment based on the driving parameter, and determining a sampling strategy according to the balance coefficient of the attention moment, wherein the sampling strategy is increasing adjustment on the sampling frequency or dynamic adjustment on the sampling window.

[0038] The refrigeration adjustment unit is connected with the data acquisition unit, the analysis processing unit, the adjustment processing unit and the sampling decision unit respectively, and is used for determining a harmonic performance state according to the harmonic amplitude and the harmonic dispersion coefficient of the target paragraph under the condition that the acquisition is completed, and determining a cooling mode of the refrigeration device according to the harmonic performance state, wherein the cooling mode is a water cooling mode or a circulation cooling mode, and the circulation cooling mode is used for determining the circulation time length ratio according to the effective harmonic difference value.

[0039] Compared with the prior art, the beneficial effects of the present application are that, in the technical scheme of the present application, the processing mode is determined according to the temperature characteristic coefficient and the heat dissipation characteristic coefficient, the temperature condition of the capacitor in the actual scene is reflected through the temperature characteristic coefficient and the heat dissipation characteristic coefficient, and different processing modes are correspondingly set, thereby avoiding the problem that a single processing mode cannot meet the actual scene requirements, improving the accuracy of capacitor temperature control, and improving the safety of the capacitor in use.

[0040] Further, in the technical scheme of the present application, when the analysis processing on the operation behavior is performed, the influence of the driving speed and the direction on the harmonic detection adjustment is considered, the temperature rise trend is predicted in advance through the harmonic detection, the problem that the temperature control process only depends on the temperature feedback in the prior art is avoided, the overheat risk caused by the temperature feedback delay is avoided, and the safety of the capacitor in use is improved.

[0041] Further, in the technical scheme of the present application, different sampling strategies are adopted according to whether the distribution of the concerned time is balanced, so that the selection of the sampling strategy is more in line with the actual scene, and the rationality of the sampling strategy is improved. When the sampling window is dynamically adjusted, the paragraph category is determined according to the density of the concerned time, and the adjustment mode is determined according to the paragraph category. The single adjustment mode cannot achieve accurate data collection, resulting in missing transient data, thereby improving the integrity of data collection. The dynamic collection strategy avoids the problem of data redundancy caused by continuous high-frequency sampling, reduces the data storage pressure, and thereby improves the accuracy and efficiency of data collection.

[0042] Further, in the technical scheme of the present application, the harmonic performance state is determined according to the harmonic amplitude and the harmonic dispersion coefficient of the paragraph, and different cooling modes of the refrigeration device are adopted according to the harmonic performance state, so as to avoid the problem that the single cooling mode in the prior art leads to insufficient accuracy of temperature control. When the cooling mode is a cycle cooling mode, the cycle length ratio is dynamically adjusted according to the effective harmonic difference value, and the liquid cooling time and the air cooling time are dynamically adjusted according to the effective harmonic difference value. The cycle cooling mode with the reference cycle length ratio is used as the main mode, and high-energy water cooling is used only when there is a high harmonic risk. In this way, the energy consumption is reduced, the liquid cooling time is prolonged to quickly suppress the temperature rise, the risk of capacitor explosion due to rapid temperature rise is reduced, and the accurate and efficient control of the capacitor temperature is realized. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 FIG. 1 is a schematic diagram of the temperature control method of the recoverable explosion-proof capacitor according to the present application;

[0044] Figure 2 FIG. 4 is a flowchart of determining the processing mode according to the temperature characterization coefficient and the heat dissipation characterization coefficient according to the present application;

[0045] Figure 3 FIG. 6 is a flowchart of determining the sampling strategy according to the balance coefficient of the concerned time according to the present application;

[0046] Figure 4 FIG. 8 is a unit connection diagram of the temperature control system of the recoverable explosion-proof capacitor according to the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose and advantages of the present application more clear and explicit, the present application will be further described below in conjunction with examples. It should be understood that the specific examples described herein are only used to explain the present application, and do not limit the protection scope of the present application.

[0048] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and do not limit the protection scope of the present application.

[0049] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0050] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] See also Figures 1 to 3 As shown, the present invention provides a temperature control method for a recoverable explosion-proof capacitor, comprising:

[0052] Determine the processing method based on the temperature characterization coefficient and the heat dissipation characterization coefficient, which is to adjust the cooling device or analyze the operating behavior;

[0053] In the process of adjusting the cooling device, the power of the cooling device is determined according to the difference in the heat dissipation characterization coefficient;

[0054] In analyzing and processing the operating behavior, the driving state is determined based on the speed change reference value and the direction change reference value, and whether harmonic detection and adjustment are performed according to the driving parameters is determined based on the driving state;

[0055] During harmonic detection and adjustment, the focus moment is determined based on driving parameters, and the sampling strategy is determined based on the equalization coefficient at the focus moment, such as increasing the sampling frequency or dynamically adjusting the sampling window.

[0056] Under the condition that the collection is completed, the harmonic performance state is determined according to the harmonic amplitude and harmonic dispersion coefficient of the target section, and the cooling method of the refrigeration device is determined to be water cooling or circulation cooling according to the harmonic performance state. When the cooling method is circulation cooling, the circulation time ratio is determined according to the effective harmonic difference.

[0057] The application scene of the application is a vehicle capacitor, and two modes of air cooling and water cooling are used for circulating cooling, wherein, in the application, the air cooling is forced ventilation through a vehicle air conditioning air duct, a fan is located at the air duct inlet to forcibly blow cold air, and a fan at the outlet position is used to draw away hot air, and the water cooling is realized by arranging a cooling plate on the surface of the capacitor, filling the interface of the cooling plate with heat-conducting silicone grease, and arranging a cooling liquid flow channel, so that the heat is indirectly absorbed by the circulating cooling liquid, thereby reducing the temperature of the capacitor.

[0058] The application is provided with a plurality of monitoring periods, and the length of a single monitoring period can be adaptively set by the user according to actual application requirements, and the application provides a value of the length of a single monitoring period, and the length of a single monitoring period is 5 min.

[0059] The application is applied to a plurality of historical records, and a single historical record at least includes a weight coefficient, a temperature representation coefficient, a heat dissipation representation coefficient, a speed change reference value, a direction change reference value, a balance coefficient, a time interval, a density, a harmonic amplitude, a harmonic dispersion coefficient and an effective harmonic difference value, and the historical record is correspondingly provided with a qualified mark, and the qualified mark records whether the historical record meets the user's demand, wherein, whether a historical record meets the user's demand can be determined according to whether the maximum temperature in the use process of the capacitor meets the user's demand for the temperature of the capacitor, and whether the historical record meets the user's demand is determined according to a self-set index, which is a content mastered by a person skilled in the art, and is not limited herein.

[0060] The application is provided with a target determination value and a related reference value, and the corresponding relationship between the target determination value and the related reference value is represented by a calculation formula containing an adjustment coefficient and a reference determination value, and the calculation formula is: target determination value = reference determination value + related reference value * adjustment coefficient, specifically, the target determination value in the application includes a cooling device power, a window length and a cycle length ratio, and the related reference value includes a temperature extreme value, a density and an effective harmonic difference value, it can be understood that each target determination value has a corresponding related reference value, and each target determination value corresponds to a reference determination value, the reference determination value is set by the user, each related reference value corresponds to an adjustment coefficient, and the adjustment coefficient is set by the user, for example, the value of the adjustment coefficient corresponding to the density can be set according to the user's demand, the user can determine the corresponding window length under different densities according to the historical record, so as to determine the influence degree of the density on the window length, and then determine the adjustment coefficient and select different adjustment coefficients, the greater the influence degree, the greater the adjustment coefficient, the adjustment coefficient is positive when the correlation is positive, and the adjustment coefficient is negative when the correlation is negative.

[0061] Specifically, the processing mode is determined according to the temperature representation coefficient and the heat dissipation representation coefficient.

[0062] If the temperature representation coefficient is greater than the preset temperature representation coefficient and the heat dissipation representation coefficient is less than or equal to the preset heat dissipation representation coefficient, the processing mode is to adjust the cooling device;

[0063] If the temperature representation coefficient is less than or equal to the preset temperature representation coefficient or the heat dissipation representation coefficient is greater than the preset heat dissipation representation coefficient, the processing mode is to analyze the operation behavior.

[0064] The temperature representation coefficient = a1 x ambient temperature + a2 x capacitor temperature; wherein a1 is the first weight coefficient, a2 is the second weight coefficient, the values of a1 and a2 can be directly set by the user according to the field experience, or the contribution of the ambient temperature and the capacitor temperature to the temperature representation coefficient is determined by statistical methods such as regression analysis or principal component analysis (PCA), so as to determine the value of the corresponding weight coefficient, the greater the contribution, the greater the value of the weight coefficient, and the weight can also be adjusted by historical records (such as machine learning).

[0065] The confirmation method of the ambient temperature is to set a plurality of first detection points within the engine compartment with the capacitor position as the center position, and within a range less than or equal to a preset distance from the center position, detect the detection temperature corresponding to the plurality of first detection points in each monitoring period, wherein for a single monitoring period, the average value of the detection temperature of all first detection points is recorded as the ambient temperature of the monitoring period.

[0066] The confirmation method of the capacitor temperature is to uniformly set a plurality of second detection points on the surface of the capacitor, arrange thermocouples at the positions of the second detection points and tightly attach the thermocouples to the capacitor shell, connect to the temperature acquisition instrument, detect the temperature corresponding to the plurality of second detection points, and record the average value of the temperature corresponding to the second detection points as the capacitor temperature.

[0067] The values of the first detection point preset number and the second detection point preset number can be adaptively set by the user according to the actual application requirements, it can be understood that the higher the user's detection accuracy requirement for the ambient temperature, the greater the first detection point preset number, and the higher the user's detection accuracy requirement for the capacitor temperature, the greater the second detection point preset number, the present application provides a preset number value method, extracts the corresponding first detection point number and second detection point number in the historical record meeting the user's demand, screens out the abnormal values, and records the average value of the first detection point number and the second detection point number after removing the abnormal values as the first detection point preset number and the second detection point preset number respectively, wherein the abnormal value screening method can be but not limited to 3σ criterion method or IQR method.

[0068] The heat dissipation characteristic coefficient is (the highest temperature of the capacitor - the ambient temperature) / the power loss of the capacitor, wherein the power loss of the capacitor is the square of the current effective value multiplied by the equivalent series resistance; the current effective value is determined by connecting a current probe clamp in series in the charging and discharging circuit of the capacitor and directly reading the current effective value using an oscilloscope, and the equivalent series resistance is determined by directly measuring the equivalent series resistance using a digital LCR meter.

[0069] The preset temperature characteristic coefficient and the preset heat dissipation characteristic coefficient can be adaptively set by the user according to actual needs, and it can be understood that the ambient temperature and the heat dissipation efficiency both affect the temperature of the capacitor, the smaller the tolerance of the user to the influence of the capacitor temperature, the smaller the preset temperature characteristic coefficient and the larger the preset heat dissipation characteristic coefficient, the present application provides a method for determining the values of the preset temperature characteristic coefficient and the preset heat dissipation characteristic coefficient, extracts the corresponding temperature characteristic coefficient and heat dissipation characteristic coefficient in the historical record meeting the user's needs, filters out the outliers, and records the average values of the temperature characteristic coefficient and the heat dissipation characteristic coefficient after removing the outliers as the preset temperature characteristic coefficient and the preset heat dissipation characteristic coefficient, respectively.

[0070] Specifically, when adjusting the cooling device, the power of the cooling device is determined according to the heat dissipation characteristic coefficient difference;

[0071] The power of the cooling device and the heat dissipation characteristic coefficient difference are in a negative correlation relationship.

[0072] The power of the cooling device = the reference power + k1 * the heat dissipation characteristic coefficient difference; wherein k1 is the adjustment coefficient corresponding to the heat dissipation characteristic coefficient difference, the heat dissipation characteristic coefficient difference = the preset heat dissipation characteristic coefficient - the heat dissipation characteristic coefficient; the value of the reference power can be adaptively set by the user according to actual application needs, and the present application provides a method for determining the value of the reference power, extracts the power of the cooling device in the historical record meeting the user's needs, filters out the outliers, and records the average value of the power of the cooling device after removing the outliers as the reference power.

[0073] Specifically, when analyzing the operation behavior, if the driving state is that the speed change reference value is greater than the preset speed change reference value and the direction change reference value is greater than the preset direction change reference value, then the harmonic detection adjustment is performed according to the driving parameters.

[0074] The driving state that the speed change reference value is less than or equal to the preset speed change reference value or the direction change reference value is less than or equal to the preset direction change reference value is recorded as a qualified driving state, and no adjustment is needed for the qualified driving state.

[0075] The confirmation method of the speed change reference value is that a plurality of time detection points are uniformly set in a monitoring period, a speed curve corresponding to the vehicle in the monitoring period is extracted, the slope of the position of each time detection point on the speed curve is detected, and the average value of the slopes corresponding to all time detection points is recorded as the speed change reference value.

[0076] The confirmation method of the direction change reference value is that the center position of the steering wheel when the vehicle is driving in a straight line is recorded as zero position, the angle of the steering wheel rotating to the left or to the right from the zero position is recorded as left rotation angle and right rotation angle respectively, the maximum left rotation angle and the maximum right rotation angle in each period are detected, and the average angle is recorded as the steering wheel angle change value of the period, wherein the confirmation method of the period is that the time corresponding to each time detection point is the center of a fixed time length, the value of the fixed time length can be adaptively set by the user according to the actual demand, and it can be understood that the higher the precision requirement of the user for the direction change reference value, the greater the value of the fixed time length, and the present application provides a value of the fixed time length, fixed time length = 3s; average angle = (maximum left rotation angle + maximum right rotation angle) / 2; the average value of the steering wheel angle change values of all periods in a single period is recorded as the direction change reference value.

[0077] The value of the preset number of time detection points can be adaptively set by the user according to the actual application demand, and it can be understood that the higher the precision requirement of the user for the speed change reference value and the direction change reference value, the greater the value of the preset number of time detection points, and the present application provides a value of the preset number of time detection points, the number of time detection points corresponding to the historical record meeting the user's demand is extracted, the abnormal values are screened out, and the average value of the number of time detection points after removing the abnormal values is recorded as the preset number of time detection points.

[0078] The value of the preset speed change reference value and the preset direction change reference value can be adaptively set by the user according to the actual demand, and it can be understood that the faster the speed change and the direction change during driving, the greater the influence on the capacitor temperature control, therefore, the smaller the tolerance of the user for the influence on the capacitor temperature control, the smaller the preset speed change reference value, and the smaller the preset direction change reference value, and the present application provides a value of the preset speed change reference value and the preset direction change reference value, the speed change reference value and the direction change reference value corresponding to the historical record meeting the user's demand are extracted, the abnormal values are screened out, and the average values of the speed change reference value and the direction change reference value after removing the abnormal values are respectively recorded as the preset speed change reference value and the preset direction change reference value.

[0079] Specifically, in the harmonic detection adjustment mode, the moment of interest is determined based on the driving parameter, and the sampling strategy is determined according to the comparison result of the equalization coefficient of the moment of interest and the preset equalization coefficient.

[0080] If the equalization coefficient of the moment of interest is greater than the preset equalization coefficient, the sampling strategy is to increase the sampling frequency.

[0081] If the equalization coefficient of the moment of interest is less than or equal to the preset equalization coefficient, the sampling strategy is to dynamically adjust the sampling window.

[0082] The driving parameter includes a speed change reference value and a direction change reference value, and the moment of interest is the moment when the driving state is that the speed change reference value is greater than a preset speed change reference value and the direction change reference value is greater than a preset direction change reference value. The equalization coefficient is determined by detecting the time interval between each moment of interest, setting △ti to represent the time interval between the ith moment of interest and the i+1th moment of interest, and the equalization

[0083] The number of time intervals in one monitoring period.

[0084] The value of the preset equalization coefficient can be adaptively set according to the actual application requirement. It can be understood that the greater the influence of the distribution state of the moment of interest on the sampling strategy, the smaller the preset equalization coefficient. The application provides a value setting method of the preset equalization coefficient, extracts the corresponding equalization coefficient in the historical record meeting the user's requirement, filters out the abnormal value, and takes the average value of the equalization coefficient after removing the abnormal value as the preset equalization coefficient.

[0085] Specifically, when the sampling frequency is increased, the sampling frequency is increased according to the effective difference value;

[0086] The sampling frequency and the effective difference value are in a positive correlation relationship.

[0087] The effective difference value is the maximum value of the speed change difference value and the direction change difference value.

[0088] The sampling frequency=k2*effective difference value; wherein k2 is an adjustment coefficient corresponding to the effective difference value, the speed change difference value=the speed change reference value-the preset speed change reference value, and the direction change difference value=the direction change reference value-the preset direction change reference value.

[0089] Specifically, when the sampling window is dynamically adjusted, the paragraph category is determined according to the density of the moment of interest, and the adjustment mode is determined according to the paragraph category.

[0090] If the paragraph category is a category of moments of interest with a density greater than a preset density, the adjustment mode is transient focusing sampling adjustment.

[0091] If the paragraph category is a two-class paragraph with a density of attention moments less than or equal to a preset density, the adjustment mode is to increase the window length.

[0092] The target set is constructed according to the time interval between two adjacent attention moments, and the first attention moment in the monitoring period is taken as a starting moment, the time interval between the second attention moment is detected, if the time interval is less than a preset time interval, the starting moment and the second attention moment are recorded in the target set, if the time interval is greater than or equal to the preset time interval, the starting moment is not recorded in the target set, and the time interval detection is continued with the second attention moment as the starting moment, until the detected time interval is greater than or equal to the preset time interval, the target set is established, and the time interval detection and the target set establishment are continued with the first attention moment in the target set as the starting moment, until the target set covers all the attention moments, and the time interval between any two adjacent attention moments in the target set is less than the preset time interval, for a single target set, the density = total duration corresponding to the target set / the number of target moments in the target set.

[0093] The value of the preset time interval can be adaptively set by the user according to actual needs, and it can be understood that the greater the influence of the time interval on the paragraph category, the smaller the value of the preset time interval, the present application provides a value setting method of the preset time interval, extracts the corresponding time interval in the historical record meeting the user's demand, screens out the abnormal value, and records the average value of the time interval after removing the abnormal value as the preset time interval.

[0094] The value of the preset density can be adaptively set by the user according to actual needs, and it can be understood that the greater the influence of the paragraph category on the adjustment mode, the smaller the value of the preset density, the present application provides a value setting method of the preset density, extracts the corresponding density in the historical record meeting the user's demand, screens out the abnormal value, and records the average value of the density after removing the abnormal value as the preset density.

[0095] When transient focusing sampling adjustment exists, if the time interval between two attention moments is less than the average time interval, the number of sampling moments between the two attention moments is increased, the user can adaptively set the increase number of sampling moments according to actual application needs, and it can be understood that the higher the user's requirement for the temperature control accuracy of the capacitor, the greater the increase number of sampling moments, the present application provides a value setting method of the increase number of sampling moments, and the increase number of sampling moments in the present application is (average time interval-time interval) x the existing number of sampling moments in the paragraph.

[0096] Specifically, based on the acquisition completion condition, the harmonic performance state is determined according to the harmonic amplitude and the harmonic dispersion coefficient of the target paragraph, and the cooling mode of the refrigeration device is determined according to the harmonic performance state.

[0097] If the harmonic performance state is a first performance state that the harmonic amplitude is greater than the preset harmonic amplitude and the harmonic dispersion coefficient is greater than the preset harmonic dispersion coefficient, the cooling mode is a water cooling mode.

[0098] If the harmonic performance state is a second performance state that the harmonic amplitude is less than or equal to the preset harmonic amplitude or the harmonic dispersion coefficient is less than or equal to the preset harmonic dispersion coefficient, the cooling mode is a circulating cooling mode.

[0099] The acquisition completion condition is that the paragraph category is determined and the data acquisition is completed.

[0100] The current value of the capacitor increases due to the presence of harmonic current, resulting in additional heat generated by the capacitor, and thus the temperature of the capacitor rises, wherein the distribution state of the hot spot is determined by analyzing the harmonic performance state of the paragraph to be local hot spot or overall temperature rise, the harmonic amplitude is confirmed by extracting the harmonic variation curve corresponding to the target paragraph, positioning the fundamental wave by obtaining the fundamental wave peak value in the frequency spectrum, recording the harmonic position at the integer multiple frequency of the fundamental frequency, and recording the peak value corresponding to the harmonic position as the harmonic amplitude.

[0101] The harmonic dispersion coefficient is confirmed by, Wherein, M is the number of harmonics appearing in a single period, X i is the amplitude corresponding to the i-th harmonic, and z is the average value of the harmonic amplitude in a single period.

[0102] The values of the preset harmonic amplitude and the preset harmonic dispersion coefficient can be adaptively set by the user according to the actual application requirements. It can be understood that the greater the influence of the harmonic performance state on the cooling mode, the smaller the value of the preset harmonic amplitude, and the smaller the value of the preset harmonic dispersion coefficient. The present application provides a method for determining the values of the preset harmonic amplitude and the preset harmonic dispersion coefficient, extracts the corresponding harmonic amplitude and harmonic dispersion coefficient in the historical record that meets the user's requirements, filters out the abnormal values, and records the average values of the harmonic amplitude and the harmonic dispersion coefficient after removing the abnormal values as the preset harmonic amplitude and the preset harmonic dispersion coefficient, respectively.

[0103] Specifically, when the cooling mode is a circulating cooling mode, the circulating time length ratio is determined according to the effective harmonic difference value;

[0104] If the effective harmonic difference value is less than the preset effective harmonic difference value, the circulating time length ratio is a reference circulating time length ratio.

[0105] If the effective harmonic difference value is greater than or equal to the preset effective harmonic difference value, the cycle time ratio is a value obtained after adaptive adjustment is performed on the reference cycle time ratio.

[0106] The effective harmonic difference value is the larger one of a harmonic amplitude difference value and a harmonic dispersion coefficient difference value, wherein the harmonic amplitude difference value = preset harmonic amplitude - harmonic amplitude, and the harmonic dispersion coefficient difference value = preset harmonic dispersion coefficient - harmonic dispersion coefficient; and the cycle time ratio = water cooling time length / air cooling time length.

[0107] The method for increasing the cycle time ratio is to increase the cycle time ratio by lengthening the water cooling time length, and the lengthening time length value can be adaptively set by the user according to actual application requirements, and it can be understood that the higher the precision requirement of the user for temperature control is, the longer the water cooling lengthening time length is, and the present application provides a lengthening time length value, lengthening time length = 0.2*water cooling time length.

[0108] The preset effective harmonic difference value can be adaptively set by the user according to actual application requirements, and it can be understood that the greater the influence degree of the effective harmonic difference value on the dynamic adjustment of the cycle time ratio is, the smaller the preset effective harmonic difference value is, and the present application provides a preset effective harmonic difference value taking method, extracts the corresponding effective harmonic difference value in the historical record meeting the user requirement, screens out the abnormal value, and takes the average value of the effective harmonic difference value after removing the abnormal value as the preset effective harmonic difference value.

[0109] Please refer to Figure 4 The present application also provides a recoverable explosion-proof capacitor temperature control system, which comprises:

[0110] The data acquisition unit comprises a plurality of data acquisition devices for acquiring monitoring data.

[0111] The analysis processing unit is connected with the data acquisition unit, and is used to determine a processing mode according to the temperature characteristic coefficient and the heat dissipation characteristic coefficient, wherein the processing mode is adjustment processing on the cooling device or analysis processing on the operation behavior.

[0112] The adjustment processing unit is connected with the data acquisition unit and the analysis unit, and is used to determine the power of the cooling device according to the heat dissipation characteristic coefficient difference when the adjustment processing on the cooling device is performed, determine the driving state according to the speed change reference value and the direction change reference value when the analysis processing on the operation behavior is performed, and determine whether to perform harmonic detection adjustment according to the driving parameter according to the driving state.

[0113] A sampling decision unit connected with the data acquisition unit, the analysis processing unit and the adjustment processing unit respectively, used to determine a concerned time based on the driving parameter, determine a distribution state according to the equalization coefficient of the concerned time, and determine a sampling strategy for increasing adjustment of the sampling frequency or dynamic adjustment of the sampling window according to the distribution state;

[0114] A refrigeration adjustment unit connected with the data acquisition unit, the analysis processing unit, the adjustment processing unit and the sampling decision unit respectively, used to determine a harmonic performance state according to the harmonic amplitude and the harmonic dispersion coefficient of the target paragraph under the condition of completed acquisition, and determine a cooling mode of the refrigeration device as a water cooling mode or a circulation cooling mode according to the harmonic performance state, the circulation cooling mode according to the effective harmonic difference value to determine a circulation time length ratio.

[0115] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A temperature control method for a recoverable explosion-proof capacitor, characterized in that: include: Determine the processing method based on the temperature characterization coefficient and the heat dissipation characterization coefficient, which is to adjust the cooling device or analyze the operating behavior; In the process of adjusting the cooling device, the power of the cooling device is determined according to the difference in the heat dissipation characterization coefficient; In analyzing and processing the operating behavior, the driving state is determined based on the speed change reference value and the direction change reference value, and whether harmonic detection and adjustment are performed according to the driving parameters is determined based on the driving state; During harmonic detection and adjustment, the focus moment is determined based on driving parameters, and the sampling strategy is determined based on the equalization coefficient at the focus moment, such as increasing the sampling frequency or dynamically adjusting the sampling window. Under the condition that the collection is completed, the harmonic performance state is determined according to the harmonic amplitude and harmonic dispersion coefficient of the target section, and the cooling method of the refrigeration device is determined to be water cooling or circulation cooling according to the harmonic performance state. When the cooling method is circulation cooling, the circulation time ratio is determined according to the effective harmonic difference.

2. The temperature control method of the recoverable explosion-proof capacitor according to claim 1, characterized in that: Determine the processing method based on the temperature characterization coefficient and the heat dissipation characterization coefficient; If the temperature characterization coefficient is greater than the preset temperature characterization coefficient and the heat dissipation characterization coefficient is less than or equal to the preset heat dissipation characterization coefficient, the processing method is to adjust the cooling device; If the temperature characterization coefficient is less than or equal to the preset temperature characterization coefficient or the heat dissipation characterization coefficient is greater than the preset heat dissipation characterization coefficient, the processing method is to analyze and process the operation behavior.

3. The temperature control method of the recoverable explosion-proof capacitor according to claim 2, characterized in that: When adjusting the cooling device, the power of the cooling device is determined based on the difference in the heat dissipation coefficient; The power of the cooling device is negatively correlated to the difference between the heat dissipation characteristic coefficient.

4. The temperature control method of the recoverable explosion-proof capacitor according to claim 2, characterized in that: When analyzing and processing the operating behavior, if the driving state is that the speed change reference value is greater than the preset speed change reference value and the direction change reference value is greater than the preset direction change reference value, harmonic detection and adjustment are performed according to the driving parameters.

5. The temperature control method of the recoverable explosion-proof capacitor according to claim 4, characterized in that: During harmonic detection and adjustment, the focus moment is determined based on driving parameters, and the sampling strategy is determined based on the comparison result of the equalization coefficient at the focus moment with the preset equalization coefficient; If the equalization coefficient at the time of interest is greater than the preset equalization coefficient, the sampling strategy is to increase the sampling frequency; If the equalization coefficient at the time of interest is less than or equal to the preset equalization coefficient, the sampling strategy is to dynamically adjust the sampling window.

6. The temperature control method of the recoverable explosion-proof capacitor according to claim 5, characterized in that: When increasing the sampling frequency, the sampling frequency is increased according to the effective difference; The sampling frequency and the effective difference are positively correlated; The effective difference is the maximum value of the speed change difference and the direction change difference.

7. The temperature control method of the recoverable explosion-proof capacitor according to claim 6, characterized in that: When dynamically adjusting the sampling window, the paragraph category is determined based on the density of the focus moment, and the adjustment method is determined based on the paragraph category; If the paragraph category is a paragraph whose density at the focus moment is greater than the preset density, the adjustment method is to perform transient focus sampling adjustment; If the paragraph category is a second-category paragraph whose density of the focus moments is less than or equal to the preset density, the adjustment method is to increase the window length.

8. The temperature control method of the recoverable explosion-proof capacitor according to claim 6, characterized in that: Based on the acquisition completion conditions, the harmonic performance status is determined according to the harmonic amplitude and harmonic dispersion coefficient of the target section, and the cooling method of the refrigeration device is determined according to the harmonic performance status; If the harmonic manifestation state is the first manifestation state in which the harmonic amplitude is greater than the preset harmonic amplitude and the harmonic dispersion coefficient is greater than the preset harmonic dispersion coefficient, the cooling method is the water cooling method; If the harmonic manifestation state is the second manifestation state in which the harmonic amplitude is less than or equal to the preset harmonic amplitude or the harmonic dispersion coefficient is less than or equal to the preset harmonic dispersion coefficient, the cooling mode is the cyclic cooling mode; The collection completion condition is that the paragraph category is determined and data collection is completed.

9. The temperature control method of the recoverable explosion-proof capacitor according to claim 8, characterized in that: When the cooling method is a cycle cooling method, the cycle duration ratio is determined according to the effective harmonic difference; If the effective harmonic difference is less than the preset effective harmonic difference, the cycle duration ratio is the benchmark cycle duration ratio; If the effective harmonic difference is greater than or equal to the preset effective harmonic difference, the cycle duration ratio is a value obtained by adaptively adjusting the benchmark cycle duration ratio.

10. A system using the temperature control method of a recoverable explosion-proof capacitor according to any one of claims 1 to 9, characterized in that: include: A data acquisition unit, including several data acquisition devices, for acquiring monitoring data; an analysis and processing unit connected to the data acquisition unit, for determining, based on the temperature characterization coefficient and the heat dissipation characterization coefficient, whether a processing mode is to adjust the cooling device or to analyze the operating behavior; an adjustment processing unit, connected to the data acquisition unit and the analysis unit, respectively, for determining the power of the cooling device according to the difference in the heat dissipation characterization coefficient when performing adjustment processing on the cooling device; When analyzing and processing the operating behavior, the driving state is determined based on the speed change reference value and the direction change reference value; and based on the driving state, it is determined whether to perform harmonic detection and adjustment based on the driving parameters; a sampling decision unit, connected to the data acquisition unit, the analysis and processing unit, and the adjustment processing unit, respectively, for determining a focus moment based on the driving parameters and determining a sampling strategy, based on a balance coefficient at the focus moment, to increase the sampling frequency or dynamically adjust the sampling window; A refrigeration adjustment unit is respectively connected to the data acquisition unit, the analysis and processing unit, the adjustment processing unit and the sampling decision unit, and is used to determine the harmonic performance state according to the harmonic amplitude and the harmonic dispersion coefficient of the target section under the condition that the acquisition is completed, and to determine the cooling mode of the refrigeration device as a water cooling mode or a circulation cooling mode according to the harmonic performance state. The circulation cooling mode determines the cycle time ratio according to the effective harmonic difference.

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