Aging state monitoring method and system applied to energy storage capacitor bank

Abstract

The invention discloses an aging state monitoring method and system applied to an energy storage capacitor bank, and relates to the technical field of energy storage system monitoring, and the method comprises the steps: carrying out the monitoring of the current temperature, the current area and the current operation resistance of the surface of the capacitor bank through a data collection module, the data processing module obtains comprehensive aging characteristics according to the total area characteristics, the temperature reference characteristics, the high-frequency impedance reference characteristics, the overtemperature region area characteristics and the area influence characteristics and transmits the comprehensive aging characteristics to the early warning module, and the early warning module performs early warning triggering according to comparison of the comprehensive aging characteristics and initial early warning characteristics. The data processing module obtains new early warning characteristics according to early warning triggering, comprehensive aging characteristics, initial early warning characteristics and early warning adjustment characteristics, and more comprehensive, accurate and timely monitoring of the aging state of the energy storage capacitor bank is realized through fusion monitoring of temperature and impedance and adjustment of dynamic early warning.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage system monitoring, and specifically to an aging state monitoring method and system for energy storage capacitor banks. Background Art

[0002] With the rapid development of energy storage technology, energy storage capacitor banks have been widely used in the fields of power systems, new energy power generation, and electric vehicles. The aging state of energy storage capacitor banks directly affects their performance and service life, and further affects the stability and reliability of the entire energy storage system. Therefore, accurately and timely monitoring the aging state of energy storage capacitor banks has important practical significance.

[0003] Most of the existing technologies only focus on the change of single parameters such as capacitance value and equivalent series resistance, while ignoring other important information such as temperature distribution and high-frequency components of electrochemical impedance spectroscopy. Therefore, problems such as local overheating inside the capacitor and changes in high-frequency performance cannot be detected in time, resulting in inaccurate assessment of the aging state.

[0004] The single-parameter monitoring of the existing technology is also difficult to reflect the faults caused by local aging inside the capacitor bank. Due to the differences in the aging degrees of different units, the single-parameter monitoring can only obtain the average information of the entire capacitor bank and cannot locate the local area with serious aging.

[0005] In addition, in the existing technology, the aging warning threshold is usually fixed and cannot be dynamically adjusted according to the actual operating conditions and aging degree of the capacitor bank. Therefore, in the initial stage of capacitor bank aging, the fixed warning threshold is too high, resulting in the failure to issue a warning in time. In the later stage of aging, the warning threshold is too low, and the system will be too sensitive, resulting in frequent false warnings. Summary of the Invention

[0006] The purpose of the present invention is to provide an aging state monitoring method and system for energy storage capacitor banks, which solves the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides a technical solution for an aging state monitoring method for energy storage capacitor banks. The specific implementation method steps are as follows: Step S1: Use a data acquisition module to monitor the current temperature, current area, and current operating resistance of the surface of the capacitor bank, obtain temperature characteristics, high-frequency impedance characteristics, and total area characteristics, and transmit them to the data processing module; Step S2: Use the data processing module to extract the initial warning characteristics, area influence characteristics, and warning adjustment characteristics obtained in the pre-test stage; Extract the preset temperature reference characteristics and high-frequency impedance reference characteristics; Step 2.1: Use the data acquisition module to obtain the over-temperature area feature of the surface area of the capacitor bank whose temperature feature exceeds the temperature reference feature. Step S2.2: Obtain the comprehensive aging feature based on the total area feature, the high-frequency impedance feature, the temperature reference feature, the high-frequency impedance reference feature, the over-temperature area feature, and the area influence feature. Transmit the comprehensive aging feature to the warning module. Step S3: Determine whether the warning module triggers a warning based on the comparison result between the comprehensive aging feature and the initial warning feature. Step S4: The data processing module obtains a new warning feature based on the warning trigger, the comprehensive aging feature, the initial warning feature, and the warning adjustment feature. When repeating steps S1 - S4, replace the initial warning feature with the new warning feature.

[0008] Optionally, the data acquisition module includes a temperature acquisition unit, a dimension measurement unit, and an impedance measurement unit. The temperature acquisition unit: is used to obtain the temperature feature and the temperature reference feature. The dimension measurement unit: is used to obtain the total area feature and the over-temperature area feature. The impedance measurement unit: is used to obtain the high-frequency impedance feature and the high-frequency impedance reference feature. The data processing module includes an initial warning determination unit, a heat area reflecting aging unit, a comprehensive aging reflecting unit, and a warning adjustment unit. The initial warning determination unit: is used to obtain the initial warning feature, the area influence feature, and the warning adjustment feature. The heat area reflecting aging unit: is used to obtain the heat area ratio feature. The comprehensive aging reflecting unit: is used to obtain the comprehensive aging feature. The warning adjustment unit: is used to obtain the new warning feature.

[0009] Optionally, the specific method steps of step S2.2 are as follows: The heat area reflecting aging unit divides the over-temperature area feature by the total area feature to obtain the heat area ratio feature for evaluating failures caused by local aging. Among them, the total area feature is used to measure the overall scale of the capacitor bank, providing a basis for obtaining the heat area ratio feature, and the over-temperature area feature reflects the part of the capacitor bank where overheating occurs. The comprehensive aging reflecting unit receives the heat area ratio feature. Obtain an impedance difference feature according to the subtraction of the high-frequency impedance feature and the high-frequency impedance reference feature; Obtain an impedance change feature according to the impedance difference feature and the high-frequency impedance reference feature; Obtain the comprehensive aging feature according to the impedance change feature, the area influence feature, and the heat area ratio feature; Among them, the impedance change feature is used to reflect the change of the high-frequency performance of the capacitor bank, and the comprehensive aging feature is used to reflect the aging state of the capacitor bank.

[0010] Optionally, the warning trigger in the step S3 includes: The comprehensive aging feature is greater than the initial warning feature; The comprehensive aging feature is equal to the initial warning feature.

[0011] Optionally, based on the warning trigger that the comprehensive aging feature is greater than the initial warning feature, the warning adjustment unit obtains an adjustment amount feature according to the warning adjustment feature and the comprehensive aging feature; Subtract the initial warning feature from the adjustment amount feature to obtain the adjusted new warning feature; Based on the warning trigger that the comprehensive aging feature is equal to the initial warning feature, directly output the new warning feature equal to the initial warning feature; Among them, the new warning feature is adjusted according to the real-time aging state of the capacitor bank, improving the accuracy and timeliness of aging warning.

[0012] Optionally, the initial warning determination unit obtains the initial warning feature according to the step S1 - the step S2.2, and the specific method is as follows: Conduct a long-term normal operation test on a batch of energy storage capacitor test groups with the same specifications; During the test, the data acquisition module continuously monitors the energy storage capacitor test group according to the step S1 and transmits it to the data processing module; The data processing module obtains the comprehensive aging feature of a group of the energy storage capacitor test groups according to the step S2.2; When the aging of the comprehensive aging feature of the energy storage capacitor test group causes more than 10% of failures, set the comprehensive aging feature with more than 10% of failures caused by current aging as the initial warning feature; Through the above detailed test process of obtaining the initial warning features, the initial warning features can be determined more scientifically, providing a reliable basis for the aging state monitoring of the energy storage capacitor bank. Among them, the faults caused by aging mainly involve electrical performance, physical structure, and thermal performance, and there are judgment criteria in the prior art for the involved faults, which can be judged according to the judgment criteria.

[0013] The present invention also provides a technical solution for an aging state monitoring system applied to an energy storage capacitor bank, including an infrared thermal imager, an image acquisition device, and an electrochemical workstation for executing the data acquisition module, a data processing device for executing the data processing module, and an alarm device for executing the warning module.

[0014] Optionally, the infrared thermal imager: is used to monitor and obtain the temperature features on the surface of the capacitor bank; The image acquisition device: is used to monitor and obtain the total area features on the surface of the capacitor bank; It is used to obtain the over-temperature area feature according to the distribution of the temperature feature and the comparison with the temperature reference feature; The electrochemical workstation: is used to monitor and obtain the high-frequency impedance features on the surface of the capacitor bank; The data processing device: is used to obtain the initial warning features, the area influence features, the warning adjustment features, the heat area ratio features, the comprehensive aging features, and the new warning features; The alarm device: is used to give a warning according to the comparison between the new warning feature and the initial warning feature.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: First, the data processing module of the present invention introduces the temperature feature that reflects the temperature distribution information obtained by the data acquisition module. The temperature feature is one of the important indicators reflecting the aging state of the capacitor. The size of the over-temperature area feature can intuitively reflect the aging degree and distribution inside the capacitor bank, providing more comprehensive information for the aging state monitoring.

[0016] The heat area ratio feature exceeding the temperature reference feature and the impedance change feature of the high-frequency component of the electrochemical impedance spectrum are fused, comprehensively considering the information of two different dimensions of temperature and high-frequency impedance. This multi-parameter fusion method can more comprehensively and accurately reflect the aging state of the capacitor bank.

[0017] Second, the new warning feature obtained by the present invention realizes the dynamic adjustment of the initial warning feature, and the purpose of dynamically adjusting the initial warning feature is achieved according to the comprehensive aging feature that reflects the aging state of the capacitor bank in real time.

[0018] In the initial stage of aging, the initial warning feature is high, which avoids premature warning. In the later stage of aging, the initial warning feature gradually decreases with the real-time comprehensive aging feature, enabling timely aging warning, thereby improving the accuracy and timeliness of the warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flowchart of the aging state monitoring method; Figure 2 is a schematic structural diagram of the data acquisition module in the present invention; Figure 3 is a schematic structural diagram of the data processing module in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Regarding the aging state monitoring method and system, it is different from the existing aging state monitoring methods and systems; The existing aging state monitoring methods and systems have limitations in single-parameter monitoring and problems in lacking dynamic warning adaptability; And the present algorithm unit realizes the fusion monitoring of two different dimensional information of temperature and high-frequency impedance and the dynamic adjustment of the warning.

[0022] Embodiment 1, please refer to Figures 1 to 3 , this embodiment provides an aging state monitoring method applied to an energy storage capacitor bank. The specific implementation method steps are as follows: Step S1: Use the data acquisition module to monitor the current temperature, current area, and current operating resistance of the capacitor bank surface, obtain temperature characteristics, high-frequency impedance characteristics, and total area characteristics, and transmit them to the data processing module; Step S2: Use the data processing module to extract the initial warning feature, area influence feature, and warning adjustment feature obtained in the pre-test stage; Extract the preset temperature reference feature and high-frequency impedance reference feature; Step 2.1: For the surface area of the capacitor bank where the temperature characteristic exceeds the temperature reference feature, use the data acquisition module to obtain the over-temperature area characteristic; Step S2.2: Obtain the comprehensive aging feature according to the total area feature, temperature reference feature, high-frequency impedance feature, high-frequency impedance reference feature, over-temperature area feature, and area influence feature; Transmit the comprehensive aging characteristics to the early warning module; Step S3: Determine whether the early warning module triggers an early warning according to the comparison result between the comprehensive aging characteristics and the initial early warning characteristics; Step S4: The data processing module obtains new early warning characteristics according to the early warning trigger, comprehensive aging characteristics, initial early warning characteristics, and early warning adjustment characteristics; When repeating steps S1 - S4, replace the initial early warning characteristics with the new early warning characteristics; The data acquisition module includes a temperature acquisition unit, a size measurement unit, and an impedance measurement unit; Temperature acquisition unit: used to obtain temperature characteristics and temperature reference characteristics; Size measurement unit: used to obtain the total area characteristic and the over-temperature area characteristic; Impedance measurement unit: used to obtain high-frequency impedance characteristics and high-frequency impedance reference characteristics; The data processing module includes an initial early warning determination unit, a heat area reflecting aging unit, a comprehensive aging reflecting unit, and an early warning adjustment unit; Initial early warning determination unit: used to obtain initial early warning characteristics, area influence characteristics, and early warning adjustment characteristics; Heat area reflecting aging unit: used to obtain the heat area ratio characteristic; Comprehensive aging reflecting unit: used to obtain comprehensive aging characteristics; Early warning adjustment unit: used to obtain new early warning characteristics.

[0023] Please refer to Figures 1 to 3 , this embodiment provides an aging state monitoring system applied to an energy storage capacitor bank, including an infrared thermal imager, an image acquisition device, and an electrochemical workstation for executing the data acquisition module, a data processing device for executing the data processing module, and an alarm device for executing the early warning module; Infrared thermal imager: used to monitor and obtain the temperature characteristics of the surface of the capacitor bank; Image acquisition device: used to monitor and obtain the total area characteristic of the surface of the capacitor bank; Used to obtain the over-temperature area characteristic according to the distribution of the temperature characteristics and the comparison with the temperature reference characteristics; Electrochemical workstation: used to monitor and obtain the high-frequency impedance characteristics of the surface of the capacitor bank; Data processing device: used to obtain initial early warning characteristics, area influence characteristics, early warning adjustment characteristics, heat area ratio characteristics, comprehensive aging characteristics, and new early warning characteristics; Alarm device: used to give an early warning according to the comparison between the new early warning characteristics and the initial early warning characteristics.

[0024] In this embodiment, the hot area reflects the area ratio characteristics and total area characteristics of the over-temperature area obtained by the aging unit through the temperature acquisition unit and size measurement unit in the data acquisition module and the corresponding equipment, and obtains the hot area ratio characteristics, and provides local temperature information for aging assessment. The comprehensive aging reflection unit fuses the hot area ratio characteristics, high-frequency impedance reference characteristics, and high-frequency impedance characteristics through the data processing module to obtain comprehensive aging characteristics for a more comprehensive and accurate aging assessment. The comprehensive aging reflection unit dynamically adjusts the initial warning characteristics in the warning module according to the comprehensive aging characteristics; Repeat steps S1 - S4 in this way, and combine the closed-loop monitoring system formed by each unit and equipment to achieve accurate and timely aging warning, and improve the reliability and stability of the system.

[0025] Please refer to Figure 3 , the specific method steps of step S2.2 are as follows: The hot area reflection aging unit divides the over-temperature area characteristic by the total area characteristic to obtain the hot area ratio characteristic; The comprehensive aging reflection unit receives the hot area ratio characteristic; The specific calculation process for obtaining the hot area ratio characteristic is as follows: ; RB is the hot area ratio characteristic, CQ m is the over-temperature area characteristic - area of the over-temperature area exceeding the pre-set temperature reference characteristic, ZQ m is the total area characteristic - total area of the entire capacitor bank; According to the subtraction of the high-frequency impedance characteristic and the high-frequency impedance reference characteristic, the impedance difference characteristic is obtained; According to the impedance difference characteristic and the high-frequency impedance reference characteristic, the impedance change characteristic is obtained; According to the impedance change characteristic, area influence characteristic, and hot area ratio characteristic, the comprehensive aging characteristic is obtained; The specific calculation process for obtaining the comprehensive aging characteristic is as follows: ; Kz is the impedance change characteristic reflecting the change of the current high-frequency impedance relative to the reference high-frequency impedance, Z high-current is the high-frequency impedance characteristic reflecting the current high-frequency impedance state of the capacitor bank, Z high-base is the high-frequency impedance reference characteristic - high-frequency impedance reference value for measuring the normal state of the capacitor bank; L is the comprehensive aging characteristic comprehensively considering the area ratio of the over-reference temperature area and the change of the high-frequency impedance, and m is the area influence characteristic for adjusting the influence degree of the area ratio of the over-reference temperature area on the comprehensive aging characteristic.

[0026] In this embodiment: First, through The calculation of can obtain the hot area proportion feature RB, which can then intuitively show the size of the overheated area in the capacitor bank. In actual operation, local aging of the capacitor often leads to an increase in temperature in this area. Through the hot area proportion feature RB, the local area with more serious aging can be quickly located. Compared with the traditional method that only focuses on the overall electrical parameters, it can more accurately capture the local anomalies inside the capacitor bank, providing a strong basis for timely discovery of potential aging risks.

[0027] The aging of capacitors is a complex process affected by multiple factors, and a single parameter is difficult to comprehensively and accurately reflect its aging state. After calculation, the hot area proportion feature RB and the impedance change feature Kz of the high-frequency component of the electrochemical impedance spectrum are fused. It combines information from two different dimensions of temperature and high-frequency impedance. Through multi-parameter fusion, the aging degree of the capacitor bank can be evaluated more comprehensively and objectively, improving the accuracy of aging assessment.

[0028] In addition, the value range of the area influence feature m is 0.1 - 1; When the area influence feature m is close to 0.1, it indicates that the influence of the hot area proportion feature RB on the impedance change feature Kz is small, meaning that in this application scenario, the change of the high-frequency component of the electrochemical impedance spectrum has a more significant impact on capacitor aging, and the size of the overheated area is relatively less important; When the area influence feature m is close to 1, it shows that the influence of the hot area proportion feature RB on the impedance change feature Kz is large, indicating that the overheating phenomenon is very crucial for capacitor aging and needs to be focused on.

[0029] Please refer to Figure 1 and Figure 3 , the warning trigger in step S3 includes: The comprehensive aging feature is greater than the initial warning feature; The comprehensive aging feature is equal to the initial warning feature; Based on the warning trigger where the comprehensive aging feature is greater than the initial warning feature, the warning adjustment unit obtains the adjustment amount feature according to the warning adjustment feature and the comprehensive aging feature; Subtract the initial warning feature from the adjustment amount feature to obtain the new warning feature after adjustment; Based on the warning trigger where the comprehensive aging feature is equal to the initial warning feature, directly output the new warning feature equal to the initial warning feature.

[0030] The specific calculation process for obtaining the new warning feature is as follows: ; Where: J new is the new warning feature for aging warning after dynamic adjustment, Jbase As the initial warning feature for determining whether the capacitor bank is aging, a is the warning adjustment feature used to control the adjustment range of the comprehensive aging feature for the initial warning feature.

[0031] In this embodiment, the new warning feature J new realizes the dynamic adjustment of the initial warning feature J base . The initial warning feature J base will be corrected in real time according to the comprehensive aging feature L to obtain the new warning feature J new .

[0032] In the initial stage of capacitor bank aging, the comprehensive aging feature L is small, and the new warning feature J new is relatively high, which can avoid premature issuance of unnecessary warnings. As the aging degree intensifies, the comprehensive aging feature L increases, and the new warning feature J new decreases accordingly, enabling timely and accurate issuance of aging warnings, thereby improving the timeliness and accuracy of warnings.

[0033] In addition, the value range of the warning adjustment feature a is between 0.01 - 0.2; When the warning adjustment feature a is close to 0.01, the adjustment of the initial warning feature J base is relatively slow, and the system is relatively stable; When the warning adjustment feature a is close to 0.2, the initial warning feature J base will be quickly adjusted with the change of the comprehensive aging feature L to make the warning sensitivity of the system high.

[0034] Embodiment 2. Please refer to Figures 1 to 3 . The initial warning determination unit obtains the initial warning feature according to steps S1 - S2.2. The specific method is as follows: Conduct long - term normal operation tests on a batch of energy storage capacitor test groups with the same specifications; During the test process, the data acquisition module continuously monitors the energy storage capacitor test group according to step S1 and transmits it to the data processing module; The data processing module obtains a set of comprehensive aging features of the energy storage capacitor test group according to step S2.2; When the aging - induced failure of the comprehensive aging feature of the energy storage capacitor test group exceeds 10%, set the comprehensive aging feature with the current aging - induced failure exceeding 10% as the initial warning feature.

[0035] In this embodiment, when conducting a long-term normal operation test on the energy storage capacitor test group, a large number of capacitors are required to achieve the scale within the group, which is more conducive to reflecting the aging characteristics and laws of this type of capacitor group during normal use. By statistically analyzing the comprehensive aging characteristics of a large number of capacitor experiments, the obtained initial warning characteristics are made more in line with the actual situation.

[0036] Through long-term operation tests, observe the performance changes of the energy storage capacitor test group at different aging stages. When it is found that the comprehensive aging characteristics reach a certain same specific value, more than 10% of the capacitors have aging-related failures within a subsequent period of time. This indicates that the comprehensive aging characteristics can more accurately reflect the risk degree of aging failures in the capacitor group, providing a reliable basis for timely warning.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aging state monitoring method applied to an energy storage capacitor bank, characterized in that The specific implementation method steps are as follows: Step S1: Use the data acquisition module to monitor the current temperature, current area, and current operating resistance of the capacitor bank surface, obtain temperature characteristics, high-frequency impedance characteristics, and total area characteristics, and transmit them to the data processing module; Step S2: Use the data processing module to extract the initial warning characteristics, area influence characteristics, and warning adjustment characteristics obtained in the pre-test stage; Extract the preset temperature reference characteristics and high-frequency impedance reference characteristics; Step 2.1: For the surface area of the capacitor bank where the temperature characteristic exceeds the temperature reference characteristic, use the data acquisition module to obtain the over-temperature area characteristic; Step S2.2: According to the total area characteristic, the high-frequency impedance characteristic, the temperature reference characteristic, the high-frequency impedance reference characteristic, the over-temperature area characteristic, and the area influence characteristic, obtain the comprehensive aging characteristic; Transmit the comprehensive aging characteristic to the warning module; Step S3: According to the comparison result between the comprehensive aging characteristic and the initial warning characteristic, determine whether the warning module triggers a warning; Step S4: The data processing module obtains a new warning characteristic according to the warning trigger, the comprehensive aging characteristic, the initial warning characteristic, and the warning adjustment characteristic; When repeating steps S1 - S4, replace the initial warning characteristic according to the new warning characteristic.

2. The aging state monitoring method for an energy storage capacitor bank according to claim 1, wherein The data acquisition module includes a temperature acquisition unit, a dimension measurement unit, and an impedance measurement unit; The temperature acquisition unit: is used to obtain the temperature characteristic and the temperature reference characteristic; The dimension measurement unit: is used to obtain the total area characteristic and the over-temperature area characteristic; The impedance measurement unit: is used to obtain the high-frequency impedance characteristic and the high-frequency impedance reference characteristic; The data processing module includes an initial warning determination unit, a heat area reflecting aging unit, a comprehensive aging reflecting unit, and a warning adjustment unit; The initial warning determination unit: is used to obtain the initial warning characteristic, the area influence characteristic, and the warning adjustment characteristic; The heat area reflecting aging unit: is used to obtain the heat area ratio characteristic; The comprehensive aging reflecting unit: is used to obtain the comprehensive aging characteristic; The warning adjustment unit: is used to obtain the new warning characteristic.

3. The aging state monitoring method for an energy storage capacitor bank according to claim 2, wherein: The specific method steps of step S2.2 are as follows: The heat area reflecting aging unit divides the over-temperature area characteristic by the total area characteristic to obtain the heat area ratio characteristic; The comprehensive aging reflecting unit receives the heat area ratio characteristic; Obtain the impedance difference characteristic according to the subtraction of the high-frequency impedance characteristic and the high-frequency impedance reference characteristic; Obtain the impedance change characteristic according to the impedance difference characteristic and the high-frequency impedance reference characteristic; Obtain the comprehensive aging characteristic according to the impedance change characteristic, the area influence characteristic, and the heat area ratio characteristic.

4. The aging state monitoring method for an energy storage capacitor bank according to claim 3, characterized in that: The warning trigger in step S3 includes: The comprehensive aging characteristic is greater than the initial warning characteristic; The comprehensive aging feature is equal to the initial warning feature.

5. The aging state monitoring method for an energy storage capacitor bank according to claim 4, wherein: Based on the warning trigger where the comprehensive aging feature is greater than the initial warning feature, the warning adjustment unit obtains an adjustment amount feature according to the warning adjustment feature and the comprehensive aging feature; Subtract the adjustment amount feature from the initial warning feature to obtain the adjusted new warning feature; Based on the warning trigger where the comprehensive aging feature is equal to the initial warning feature, directly output the new warning feature equal to the initial warning feature.

6. The aging state monitoring method for an energy storage capacitor bank according to claim 5, wherein: The initial warning determination unit obtains the initial warning feature according to the steps S1 - S2.2, and the specific method is as follows: Conduct long-term normal operation tests on a batch of energy storage capacitor test groups with the same specifications; During the test, the data acquisition module continuously monitors the energy storage capacitor test group according to the step S1 and transmits it to the data processing module; The data processing module obtains the comprehensive aging feature of a group of the energy storage capacitor test groups according to the step S2.2; When the aging of the comprehensive aging feature of the energy storage capacitor test group causes more than 10% of failures, set the comprehensive aging feature with more than 10% of failures caused by current aging as the initial warning feature.

7. An aging state monitoring system for an energy storage capacitor bank that implements the aging state monitoring method for an energy storage capacitor bank according to any one of claims 1-6, characterized in that, It includes an infrared thermal imager, an image acquisition device, and an electrochemical workstation for executing the data acquisition module, a data processing device for executing the data processing module, and an alarm device for executing the warning module.

8. The aging state monitoring system applied to an energy storage capacitor bank according to claim 7, wherein The infrared thermal imager: used to monitor and obtain the temperature feature on the surface of the capacitor bank; The image acquisition device: used to monitor and obtain the total area feature on the surface of the capacitor bank; Used to obtain the distribution of the temperature feature and compare it with the temperature reference feature to obtain the over-temperature area feature; The electrochemical workstation: used to monitor and obtain the high-frequency impedance feature on the surface of the capacitor bank; The data processing device: used to obtain the initial warning feature, the area influence feature, the warning adjustment feature, the heat area ratio feature, the comprehensive aging feature, and the new warning feature; The alarm device: used to give a warning according to the comparison between the new warning feature and the initial warning feature.

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