Aging status monitoring method and system for energy storage capacitor bank

Abstract

The present invention discloses an aging status monitoring method and system for energy storage capacitor groups, relating to the technical field of energy storage system monitoring. The method and system include utilizing a data acquisition module to monitor the current temperature, current area, and current operating impedance of the capacitor group surface. The data processing module obtains comprehensive aging characteristics based on total area characteristics, temperature reference characteristics, high-frequency impedance reference characteristics, over-temperature area characteristics, and area impact characteristics, and transmits the characteristics to an early warning module. Based on a comparison between the comprehensive aging characteristics and initial early warning characteristics, the early warning module triggers an early warning. The data processing module obtains new early warning characteristics based on the early warning trigger, the comprehensive aging characteristics, the initial early warning characteristics, and the early warning adjustment characteristics. The present invention achieves more comprehensive, accurate, and timely monitoring of the aging status of the energy storage capacitor group through integrated monitoring of temperature and impedance and adjustment of dynamic early warnings.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage system monitoring, and in particular to an aging status monitoring method and system for an energy storage capacitor group. Background Art

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

[0003] Existing technologies mostly focus solely on changes in capacitance and equivalent series resistance (ESR), while ignoring other important information such as temperature distribution and the high-frequency components of the electrochemical impedance spectrum. Consequently, localized overheating within the capacitor and changes in high-frequency performance cannot be detected promptly, leading to inaccurate assessments of aging conditions.

[0004] Single parameter monitoring in existing technologies is also difficult to reflect failures caused by local aging within the capacitor bank. Since the degree of aging of different units varies, single parameter monitoring can only obtain average information of the entire capacitor bank and cannot locate local areas with severe 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 early stage of capacitor bank aging, the fixed warning threshold is too high, resulting in the inability to issue a warning in a timely manner. 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 a method and system for monitoring the aging status of an energy storage capacitor bank, which solves the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides a technical solution for an aging status monitoring method for an energy storage capacitor bank, and the specific implementation steps include the following:

[0008] Step S1: Using the data acquisition module, monitor the current temperature, current area, and current operating impedance of the capacitor bank surface, obtain temperature characteristics, high-frequency impedance characteristics, and total area characteristics, and transmit them to the data processing module;

[0009] Step S2: using the data processing module to extract the initial warning features, area impact features, and warning adjustment features obtained in the pre-test phase;

[0010] Extracting pre-set temperature reference features and high-frequency impedance reference features;

[0011] Step 2.1: Calculate the surface area of the capacitor bank where the temperature characteristic exceeds the temperature reference characteristic, and obtain the over-temperature area characteristic by using a data acquisition module;

[0012] Step S2.2: Obtaining a 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 region area feature, and the area impact feature;

[0013] transmitting the comprehensive aging characteristics to an early warning module;

[0014] Step S3: determining whether the warning module triggers a warning based on the comparison result between the comprehensive aging characteristics and the initial warning characteristics;

[0015] Step S4: the data processing module obtains a new warning feature according to the warning trigger, the comprehensive aging feature, the initial warning feature, and the warning adjustment feature;

[0016] When steps S1 to S4 are repeated, the initial warning feature is replaced according to the new warning feature.

[0017] Optionally, the data acquisition module includes a temperature acquisition unit, a dimension measurement unit, and an impedance measurement unit;

[0018] The temperature acquisition unit is used to obtain the temperature characteristics and the temperature reference characteristics;

[0019] The size measurement unit is used to obtain the total area characteristics and the over-temperature area characteristics;

[0020] The impedance measurement unit is used to obtain the high-frequency impedance characteristics and the high-frequency impedance reference characteristics;

[0021] The data processing module includes an initial warning determination unit, a hot area aging reflection unit, a comprehensive aging reflection unit, and a warning adjustment unit;

[0022] The initial warning determination unit is configured to obtain the initial warning feature, the area impact feature, and the warning adjustment feature;

[0023] The hot area reflecting aging unit is used to obtain the hot area proportion feature;

[0024] The comprehensive aging reflection unit is used to obtain the comprehensive aging characteristics;

[0025] The early warning adjustment unit is used to obtain the new early warning feature.

[0026] Optionally, the specific method steps of step S2.2 are as follows:

[0027] The thermal area aging reflection unit divides the over-temperature area area feature by the total area feature to obtain the thermal area proportion feature for evaluating the failure caused by local aging;

[0028] Among them, the total area feature is used to measure the overall size of the capacitor bank and provide a basis for obtaining the hot area ratio feature. The overtemperature area feature reflects the part of the capacitor bank that is overheated.

[0029] The comprehensive aging reflection unit receives the heat area proportion feature;

[0030] Obtaining an impedance difference feature by subtracting the high-frequency impedance feature from the high-frequency impedance reference feature;

[0031] Acquiring an impedance change feature according to the impedance difference feature and the high-frequency impedance reference feature;

[0032] Obtaining the comprehensive aging characteristics according to the impedance change characteristics, the area impact characteristics, and the hot area proportion characteristics;

[0033] Among them, the impedance change characteristic is used to reflect the change of the high-frequency performance of the capacitor bank, and the comprehensive aging characteristic is used to reflect the aging status of the capacitor bank.

[0034] Optionally, the warning trigger in step S3 includes:

[0035] The comprehensive aging characteristic is greater than the initial warning characteristic;

[0036] The comprehensive aging feature is equal to the initial warning feature.

[0037] Optionally, based on the warning triggering 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;

[0038] Subtracting the initial warning feature from the adjustment feature to obtain the adjusted new warning feature;

[0039] Based on the warning trigger that the comprehensive aging feature is equal to the initial warning feature, directly outputting the new warning feature equal to the initial warning feature;

[0040] Among them, the new early warning feature is adjusted according to the real-time aging status of the capacitor bank, which improves the accuracy and timeliness of the aging warning.

[0041] Optionally, the initial warning determination unit obtains the initial warning feature according to step S1 to step S2.2, specifically in the following manner:

[0042] Conduct long-term normal operation tests on a batch of energy storage capacitor test groups of the same specifications;

[0043] During the test, the data acquisition module continuously monitors the energy storage capacitor test group according to step S1 and transmits the data to the data processing module;

[0044] The data processing module obtains the comprehensive aging characteristics of a group of the energy storage capacitor test group according to step S2.2;

[0045] When the aging-induced fault rate of the comprehensive aging feature of the energy storage capacitor test group exceeds 10%, setting the comprehensive aging feature of the current aging-induced fault rate exceeding 10% as the initial warning feature;

[0046] Through the above detailed test process of obtaining the initial warning characteristics, the initial warning characteristics can be determined more scientifically and provide a reliable basis for monitoring the aging status of the energy storage capacitor group. Among them, the failures caused by aging mainly involve electrical performance, physical structure, and thermal performance. The failures involved all have existing technical judgment standards and can be judged according to the judgment standards.

[0047] The present invention also provides a technical solution for an aging status monitoring system applied to an energy storage capacitor group, including an infrared thermal imager, an image acquisition device, 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.

[0048] Optionally, the infrared thermal imager is used to monitor and obtain the temperature characteristics of the surface of the capacitor bank;

[0049] The image acquisition device is used to monitor and obtain the total area characteristics of the surface of the capacitor bank;

[0050] Used to obtain the area feature of the over-temperature region based on the distribution of the temperature feature and the comparison with the temperature reference feature;

[0051] The electrochemical workstation is used to monitor and obtain the high-frequency impedance characteristics of the surface of the capacitor bank;

[0052] The data processing device is used to obtain the initial warning feature, the area impact feature, the warning adjustment feature, the hot area proportion feature, the comprehensive aging feature, and the new warning feature;

[0053] The alarm device is used to issue an early warning based on the comparison between the new early warning feature and the initial early warning feature.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1. The data processing module of the present invention introduces the temperature characteristics reflecting the temperature distribution information obtained by the data acquisition module. The temperature characteristics are one of the important indicators reflecting the aging status of capacitors. The size of the over-temperature area characteristics can intuitively reflect the aging degree and distribution within the capacitor bank, providing more comprehensive information for aging status monitoring.

[0056] The thermal area ratio characteristics of the super-temperature benchmark characteristics and the impedance change characteristics of the high-frequency components of the electrochemical impedance spectrum are integrated, and information from two different dimensions of temperature and high-frequency impedance is comprehensively considered. This multi-parameter fusion method can more comprehensively and accurately reflect the aging status of the capacitor group.

[0057] 2. The new warning feature obtained by the present invention realizes the dynamic adjustment of the initial warning feature, wherein the purpose of dynamically adjusting the initial warning feature is achieved based on the comprehensive aging feature that reflects the aging status of the capacitor bank in real time.

[0058] In the early stages of aging, the initial warning characteristics are high, avoiding premature warnings. In the later stages of aging, the initial warning characteristics gradually decrease with the real-time comprehensive aging characteristics, and aging warnings can be issued in a timely manner, thereby improving the accuracy and timeliness of the warnings. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a flow chart of the aging status monitoring method;

[0060] Figure 2 Schematic diagram of the structure of the data acquisition module in the present invention;

[0061] Figure 3 It is a structural diagram of the data processing module in the present invention. DETAILED DESCRIPTION

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] Regarding the present aging status monitoring method and system, it is different from the existing aging status monitoring method and system;

[0064] Existing aging status monitoring methods and systems have the limitation of single parameter monitoring and lack of dynamic early warning adaptability;

[0065] This algorithm unit realizes the fusion monitoring of two different dimensional information, temperature and high-frequency impedance, as well as the dynamic adjustment of early warning.

[0066] For example 1, please refer to Figures 1 to 3 This embodiment provides an aging status monitoring method for energy storage capacitor banks, and the specific implementation steps include the following:

[0067] Step S1: Using the data acquisition module, monitor the current temperature, current area, and current operating impedance of the capacitor bank surface, obtain temperature characteristics, high-frequency impedance characteristics, and total area characteristics, and transmit them to the data processing module;

[0068] Step S2: using the data processing module to extract the initial warning features, area impact features, and warning adjustment features obtained in the pre-test phase;

[0069] Extracting pre-set temperature reference features and high-frequency impedance reference features;

[0070] Step 2.1: Calculate the surface area of the capacitor bank where the temperature characteristic exceeds the temperature reference characteristic, and use the data acquisition module to obtain the area characteristics of the over-temperature region;

[0071] Step S2.2: Obtain comprehensive aging characteristics based on the total area characteristics, temperature baseline characteristics, high-frequency impedance characteristics, high-frequency impedance baseline characteristics, over-temperature area characteristics, and area impact characteristics;

[0072] Transmitting the comprehensive aging characteristics to the early warning module;

[0073] Step S3: Determine whether the warning module triggers a warning based on the comparison result between the comprehensive aging characteristics and the initial warning characteristics;

[0074] Step S4: The data processing module obtains new warning features based on the warning trigger, the comprehensive aging features, the initial warning features, and the warning adjustment features;

[0075] When repeating steps S1 to S4, the initial warning features are replaced according to the new warning features;

[0076] The data acquisition module includes a temperature acquisition unit, a dimension measurement unit, and an impedance measurement unit;

[0077] Temperature acquisition unit: used to obtain temperature characteristics and temperature reference characteristics;

[0078] Size measurement unit: used to obtain total area characteristics and over-temperature area characteristics;

[0079] Impedance measurement unit: used to obtain high-frequency impedance characteristics and high-frequency impedance reference characteristics;

[0080] The data processing module includes an initial warning determination unit, a hot area aging reflection unit, a comprehensive aging reflection unit, and a warning adjustment unit;

[0081] Initial warning determination unit: used to obtain initial warning characteristics, area impact characteristics, and warning adjustment characteristics;

[0082] Thermal area reflecting aging unit: used to obtain thermal area ratio characteristics;

[0083] Comprehensive aging reflection unit: used to obtain comprehensive aging characteristics;

[0084] Warning adjustment unit: used to obtain new warning features.

[0085] See also Figures 1 to 3 , this embodiment provides an aging status monitoring system for energy storage capacitor banks, including an infrared thermal imager, an image acquisition device, an electrochemical workstation for executing a data acquisition module, a data processing device for executing a data processing module, and an alarm device for executing an early warning module;

[0086] Infrared thermal imager: used to monitor and obtain the temperature characteristics of the capacitor bank surface;

[0087] Image acquisition equipment: used to monitor and obtain the total area characteristics of the capacitor bank surface;

[0088] Used to obtain the area characteristics of the over-temperature area based on the distribution of temperature characteristics and comparison with the temperature reference characteristics;

[0089] Electrochemical workstation: used to monitor and obtain high-frequency impedance characteristics on the surface of the capacitor bank;

[0090] Data processing equipment: used to obtain initial warning characteristics, area impact characteristics, warning adjustment characteristics, hot area ratio characteristics, comprehensive aging characteristics, and new warning characteristics;

[0091] Alarm device: used to issue an early warning based on the comparison between the new early warning characteristics and the initial early warning characteristics.

[0092] In this embodiment, the thermal area aging reflection unit utilizes the temperature acquisition unit and dimension measurement unit in the data acquisition module, as well as the over-temperature area and total area characteristics acquired by the corresponding equipment, to obtain the thermal area proportion characteristics and provide local temperature information for aging assessment. The comprehensive aging reflection unit, through the data processing module, integrates the thermal area proportion characteristics, high-frequency impedance baseline characteristics, and high-frequency impedance characteristics to obtain a comprehensive aging characteristic for a more comprehensive and accurate aging assessment. The comprehensive aging reflection unit dynamically adjusts the initial warning characteristics in the warning module based on the comprehensive aging characteristics.

[0093] Repeat steps S1 to S4 in this way, and combine the closed-loop monitoring system formed by each unit and equipment to achieve accurate and timely aging warning, thereby improving system reliability and stability.

[0094] See also Figure 3 The specific steps of step S2.2 are as follows:

[0095] The hot area reflecting aging unit divides the over-temperature area area feature by the total area feature to obtain the hot area proportion feature;

[0096] Comprehensive aging reflects the characteristics of the proportion of the unit receiving heat area;

[0097] The specific calculation process for obtaining the hot area ratio feature is as follows:

[0098] ;

[0099] RB is the hot area ratio feature, CQ m The area of the over-temperature region that exceeds the preset temperature reference characteristic - the area of the region, ZQ m is the total area characteristic of the entire capacitor bank - total area;

[0100] Obtaining an impedance difference feature by subtracting the high-frequency impedance feature from the high-frequency impedance reference feature;

[0101] Obtain impedance change characteristics based on impedance difference characteristics and high-frequency impedance reference characteristics;

[0102] Obtain comprehensive aging characteristics based on impedance change characteristics, area impact characteristics, and thermal area ratio characteristics;

[0103] The specific calculation process for obtaining comprehensive aging characteristics is as follows:

[0104] ;

[0105] Kz is the impedance change characteristic that reflects the change of the current high-frequency impedance relative to the reference high-frequency impedance, and Z high-current To reflect the high-frequency impedance characteristics of the capacitor bank’s current high-frequency impedance state, Z high-base It is used to measure the high-frequency impedance benchmark characteristic of the capacitor bank under normal conditions - the high-frequency impedance benchmark value;

[0106] L is the comprehensive aging feature that comprehensively considers the area ratio of the super-baseline temperature region and the high-frequency impedance change, and m is the area influence feature used to adjust the degree of influence of the area ratio of the super-baseline temperature region on the comprehensive aging feature.

[0107] In this embodiment: First, The calculation can obtain the hot area ratio feature RB, which can then intuitively show the size of the overheating area in the capacitor bank. In actual operation, local aging of the capacitor often causes the temperature of this area to rise. The hot area ratio feature RB can quickly locate the local area with more serious aging. Compared with the traditional method that only focuses on the overall electrical parameters, it can more accurately capture local anomalies within the capacitor bank, providing a strong basis for timely detection of potential aging risks.

[0108] The aging of capacitors is a complex process, which is affected by many factors. It is difficult for a single parameter to fully and accurately reflect its aging state. The calculation of the thermal area ratio feature RB and the impedance change feature Kz of the high-frequency component of the electrochemical impedance spectrum are fused. It integrates information from two different dimensions, temperature and high-frequency impedance. Through multi-parameter fusion, the aging degree of the capacitor bank can be evaluated more comprehensively and objectively, thereby improving the accuracy of aging assessment.

[0109] In addition, the area influence feature m ranges from 0.1 to 1;

[0110] When the area influence feature m is close to 0.1, it indicates that the hot area ratio feature RB has little influence on the impedance change feature Kz. This means that in this application scenario, the change in the high-frequency component of the electrochemical impedance spectrum has a more significant impact on capacitor aging, while the size of the overheating area is relatively less important.

[0111] When the area influence characteristic m is close to 1, it indicates that the thermal area ratio characteristic RB has a great influence on the impedance change characteristic Kz, which means that the influence of overheating on capacitor aging is very critical and requires special attention.

[0112] See also Figure 1 and Figure 3 The warning trigger in step S3 includes:

[0113] Comprehensive aging characteristics are greater than initial warning characteristics;

[0114] The comprehensive aging characteristics are equal to the initial warning characteristics;

[0115] Based on the warning trigger when 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;

[0116] Subtract the initial warning feature from the adjustment feature to obtain the adjusted new warning feature;

[0117] Based on the warning trigger that the comprehensive aging feature is equal to the initial warning feature, a new warning feature equal to the initial warning feature is directly output.

[0118] The specific calculation process for obtaining new warning features is as follows:

[0119] ;

[0120] in:

[0121] J new To provide a new warning feature for aging warning after dynamic adjustment, J base is the initial warning feature for determining whether the capacitor bank is aging, and a is the warning adjustment feature used to control the adjustment amplitude of the initial warning feature by the comprehensive aging feature.

[0122] In this embodiment, the new warning feature J new Realized the initial warning feature J base Dynamic adjustment of initial warning characteristics J base It will be corrected in real time based on the comprehensive aging feature L to obtain the new warning feature J new .

[0123] In the early stage of capacitor bank aging, the comprehensive aging feature L is small and the new warning feature J new Relatively high, it can avoid unnecessary early warning. As the aging degree increases, the comprehensive aging feature L increases, and the new warning feature J new The corresponding reduction can timely and accurately issue aging warnings, improving the timeliness and accuracy of warnings.

[0124] In addition, the value range of the warning adjustment feature a is between 0.01 and 0.2;

[0125] When the warning adjustment feature a is close to 0.01, the initial warning feature J base The adjustment is slow and the system is relatively stable;

[0126] When the warning adjustment feature a is close to 0.2, the initial warning feature J base It will adjust quickly as the comprehensive aging characteristics L change, so that the system's warning sensitivity is high.

[0127] For example 2, please refer to Figures 1 to 3 The initial warning determination unit obtains the initial warning features according to steps S1 to S2.2. The specific method is as follows:

[0128] Conduct long-term normal operation tests on a batch of energy storage capacitor test groups of the same specifications;

[0129] During the test, the data acquisition module continuously monitors the energy storage capacitor test group according to step S1 and transmits the data to the data processing module;

[0130] The data processing module obtains the comprehensive aging characteristics of a test group of energy storage capacitors according to step S2.2;

[0131] When the aging-induced fault rate of the comprehensive aging characteristics of the energy storage capacitor test group exceeds 10%, the comprehensive aging characteristics of the current aging-induced fault rate exceeding 10% are set as the initial warning characteristics.

[0132] In this embodiment, when the energy storage capacitor test group is subjected to a long-term normal operation test, the scale of the group requires a large number of capacitors to be realized, 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 initial warning characteristics obtained are more in line with the actual situation.

[0133] Through long-term operation tests, the performance changes of the energy storage capacitor test group at different aging stages were observed. When it was found that the comprehensive aging characteristics reached a certain specific value, more than 10% of the capacitors experienced aging-related failures in the subsequent period of time. This shows that the comprehensive aging characteristics can more accurately reflect the risk level of aging failure in the capacitor group, providing a reliable basis for timely early warning.

[0134] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for monitoring the aging status of an energy storage capacitor bank, characterized in that: The specific implementation steps include the following: Step S1: Using the data acquisition module, monitor the current temperature, current area, and current operating impedance 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: using the data processing module to extract the initial warning features, area impact features, and warning adjustment features obtained in the pre-test phase; Extracting pre-set temperature reference features and high-frequency impedance reference features; Step 2.1: Calculate the surface area of the capacitor bank where the temperature characteristic exceeds the temperature reference characteristic, and obtain the over-temperature area characteristic by using a data acquisition module; Step S2.2: Obtaining a 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 region area feature, and the area impact feature; transmitting the comprehensive aging characteristics to an early warning module; Step S3: determining whether the warning module triggers a warning based on the comparison result between the comprehensive aging characteristics and the initial warning characteristics; Step S4: the data processing module obtains a new warning feature according to the warning trigger, the comprehensive aging feature, the initial warning feature, and the warning adjustment feature; When steps S1 to S4 are repeated, the initial warning feature is replaced according to the new warning feature.

2. The aging status monitoring method for energy storage capacitor bank according to claim 1, characterized in that: 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 characteristics and the temperature reference characteristics; The size measurement unit is used to obtain the total area characteristics and the over-temperature area characteristics; The impedance measurement unit is used to obtain the high-frequency impedance characteristics and the high-frequency impedance reference characteristics; The data processing module includes an initial warning determination unit, a hot area aging reflection unit, a comprehensive aging reflection unit, and a warning adjustment unit; The initial warning determination unit is configured to obtain the initial warning feature, the area impact feature, and the warning adjustment feature; The hot area reflecting aging unit is used to obtain the hot area proportion feature; The comprehensive aging reflection unit is used to obtain the comprehensive aging characteristics; The early warning adjustment unit is used to obtain the new early warning feature.

3. The aging status monitoring method for an energy storage capacitor bank according to claim 2, characterized in that: The specific method steps of step S2.2 are as follows: The hot area reflecting aging unit divides the over-temperature area feature by the total area feature to obtain the hot area proportion feature; The comprehensive aging reflection unit receives the heat area proportion feature; Obtaining an impedance difference feature by subtracting the high-frequency impedance feature from the high-frequency impedance reference feature; Acquiring an impedance change feature according to the impedance difference feature and the high-frequency impedance reference feature; The comprehensive aging characteristics are obtained according to the impedance change characteristics, the area impact characteristics, and the hot area proportion characteristics.

4. The aging status monitoring method for an energy storage capacitor bank according to claim 3, characterized in that: The early 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 status monitoring method for energy storage capacitor bank according to claim 4, characterized in that: Based on the warning triggering 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; Subtracting the initial warning feature from the adjustment 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, the new warning feature equal to the initial warning feature is directly output.

6. The aging status monitoring method for energy storage capacitor bank according to claim 5, characterized in that: The initial warning determination unit obtains the initial warning feature according to step S1 to step S2.2, and the specific method is as follows: Conduct long-term normal operation tests on a batch of energy storage capacitor test groups of the same specifications; During the test, the data acquisition module continuously monitors the energy storage capacitor test group according to step S1 and transmits the data to the data processing module; The data processing module obtains the comprehensive aging characteristics of a group of the energy storage capacitor test group according to step S2.2; When the aging-induced failure rate of the comprehensive aging feature of the energy storage capacitor test group exceeds 10%, the comprehensive aging feature with the current aging-induced failure rate exceeding 10% is set as the initial warning feature.

7. An aging status monitoring system for an energy storage capacitor bank that implements the aging status monitoring method for an energy storage capacitor bank according to any one of claims 3 to 6, characterized in that: It includes an infrared thermal imager, an image acquisition device, 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.

8. The aging status monitoring system for energy storage capacitor banks according to claim 7, characterized in that: The infrared thermal imager is used to monitor and obtain the temperature characteristics of the surface of the capacitor bank; The image acquisition device is used to monitor and obtain the total area characteristics of the surface of the capacitor bank; Used to obtain the area feature of the over-temperature region based on 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 characteristics of the surface of the capacitor bank; The data processing device is used to obtain the initial warning feature, the area impact feature, the warning adjustment feature, the hot area proportion feature, the comprehensive aging feature, and the new warning feature; The alarm device is used to issue an early warning based on the comparison between the new early warning feature and the initial early warning feature.

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