A 800v ac-dc junction box safe operation management method

Abstract

The application provides a kind of 800V AC-DC busbar safety operation management method, it is related to the intelligent control technical field of busbar, comprising the following steps: call the historical operation sequence of busbar in target accounting period, including the operation parameters of multiple historical operation time, including the current value, voltage value, wire core temperature value of internal circuit, and air temperature value and air humidity value in the box;Statistical wire core temperature value exceeds the first cumulative duration of preset rated temperature value, the second cumulative duration of abnormal microclimate in the box;Get the circuit aging reference value and environmental aging reference value of target accounting period, fuse the circuit aging reference value and environmental aging reference value of target accounting period, generate safety operation value.The method truly reflects the degree of progressive deterioration of equipment materials caused by the effect of working condition in the target accounting period, significantly improves the accuracy of 800V AC-DC busbar risk identification.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology for combiner boxes, specifically to a method for safe operation management of an 800V AC / DC combiner box. Background Technology

[0002] With the rapid development of new energy power generation (such as photovoltaic and wind power) and fast charging technology for electric vehicles, the application of 800V high-voltage DC systems is becoming increasingly widespread. As a critical power collection and distribution node in the system, the AC / DC combiner box's internal wiring, connectors, and insulation materials are crucial for long-term safe and stable operation under high-voltage and high-current conditions. Aging and failure of the combiner box's internal wiring can lead to serious accidents such as increased heat generation, decreased insulation, and even fire. Therefore, effective monitoring and management of the combiner box's operating status, and timely detection of potential risks, are core elements in ensuring the safety of the entire high-voltage system.

[0003] In existing technologies, such as the invention patent with publication number CN 115420336 A, a data analysis-based safety operation management system for 800V AC / DC combiner boxes is proposed. This system monitors combiner box operating parameters (such as current, voltage, temperature, and humidity) and triggers over-limit alarms or protective actions (such as overcurrent tripping and high-temperature warnings) by setting thresholds. However, the aging of electrical equipment is a gradual process closely related to the intensity of overload / harsh environmental conditions and the cumulative duration of their effects. Traditional methods focus on instantaneous safety protection and lack a systematic and quantitative assessment of the cumulative aging effects of equipment. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a method for safe operation management of 800V AC / DC combiner boxes, so as to improve the accuracy of safe operation management of 800V AC / DC combiner boxes;

[0005] The method includes the following steps:

[0006] Retrieve the historical operating sequence of the combiner box within the target accounting period. The historical operating sequence includes multiple historical operating times and operating parameters at each historical operating time. The operating parameters include the current value, voltage value, and core temperature value of the internal circuit, as well as the air temperature and humidity value inside the box.

[0007] The first cumulative duration during which the core temperature value exceeds the preset rated temperature value and the second cumulative duration of abnormal microclimate inside the box are calculated within the target calculation period. The abnormal microclimate inside the box includes the air temperature value exceeding the first preset temperature or the air humidity value exceeding the first preset humidity.

[0008] Based on the current value, voltage value, core temperature value, and first cumulative duration at multiple historical operating times, the circuit aging reference value for the target calculation cycle is obtained;

[0009] Based on the air temperature and humidity values ​​at multiple historical operating times, and the second cumulative duration, the environmental aging reference value for the target accounting cycle is obtained.

[0010] By integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle, a safe operating value is generated.

[0011] According to the technical solution provided in this application, obtaining the circuit aging reference value based on the current value, voltage value, core temperature value, and the first cumulative duration at multiple historical operating times includes the following steps:

[0012] The intensity of the Joule heating effect is calculated based on the current values ​​at multiple historical operating times.

[0013] Based on the voltage values ​​at multiple historical operating times, the voltage deviation is determined, wherein the voltage deviation is the frequency or average extent of the voltage value exceeding the rated voltage range;

[0014] Based on the first cumulative duration, the intensity of the Joule heating effect, and the voltage deviation, the circuit aging reference value is calculated using a circuit aging model.

[0015] According to the technical solution provided in this application, the circuit aging model satisfies the following constraints:

[0016] The circuit aging reference value increases monotonically with the increase of the Joule heating effect intensity, the extension of the first cumulative duration, or the increase of the voltage deviation.

[0017] When the voltage deviation is greater than a first preset threshold, the growth rate of the circuit aging reference value is higher than its growth rate when the voltage deviation is less than or equal to the first preset threshold.

[0018] According to the technical solution provided in this application, obtaining the environmental aging reference value based on the air temperature and humidity values ​​at multiple historical operating times, and the second cumulative duration, includes the following steps:

[0019] Based on the air temperature values ​​at multiple historical operating times, a temperature exceedance characteristic value is determined. The temperature exceedance characteristic value is the frequency or average exceedance of the air temperature value exceeding a first preset temperature.

[0020] Based on the air humidity values ​​at multiple historical operating times, a humidity exceeding characteristic value is determined, wherein the humidity exceeding characteristic value is the frequency or average exceeding range of the air humidity value exceeding a first preset humidity.

[0021] Based on the second cumulative duration, the temperature exceeding the limit characteristic value, and the humidity exceeding the limit characteristic value, the environmental aging reference value is calculated using an environmental aging model.

[0022] According to the technical solution provided in this application, the environmental aging model satisfies the following constraints:

[0023] The environmental aging reference value increases monotonically as the temperature exceeding the limit characteristic value increases, the humidity exceeding the limit characteristic value increases, or the second cumulative duration increases.

[0024] The temperature exceeding the limit characteristic value and the humidity exceeding the limit characteristic value have a synergistic gain relationship on the aging acceleration effect. The synergistic gain relationship indicates that when both exceed the limit simultaneously, the growth rate of the environmental aging reference value is higher than the sum of the growth rates when they exceed the limit individually.

[0025] According to the technical solution provided in this application, the method further includes the following steps:

[0026] Obtain the circuit aging reference values ​​for the preceding N-1 consecutive reference accounting cycles adjacent to the target accounting cycle, and form a circuit aging reference value sequence together with the circuit aging reference values ​​for the target accounting cycle;

[0027] Based on the circuit aging reference value sequence, a first circuit weight factor is generated, and then a first environmental weight factor is obtained.

[0028] The process of integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle to generate a safe operating value includes the following steps:

[0029] Based on the first circuit weight factor and the first environment weight factor, the circuit aging reference value and the environmental aging reference value for the target accounting cycle are weighted and fused to generate a safe operating value.

[0030] According to the technical solution provided in this application, the step of generating a first circuit weight factor based on the circuit aging reference value sequence, and then obtaining a first environmental weight factor, includes the following steps:

[0031] Calculate the direction of change of the circuit aging reference value in every two adjacent calculation cycles in the circuit aging reference value sequence; wherein, if the circuit aging reference value in the later calculation cycle is greater than the circuit aging reference value in the previous calculation cycle, it is recorded as a positive change, and otherwise it is recorded as a negative change.

[0032] The proportion of positive changes in the circuit aging reference value sequence to the total number of changes is used as the continuous degradation rate.

[0033] Calculate the average aging value of the circuit aging reference value for all historical accounting periods, and take the absolute value of the difference between the circuit aging reference value for the target accounting period and the average aging value as the current deviation.

[0034] Based on the continuous degradation rate and the current deviation, a first circuit weight factor is obtained, which belongs to the range of 0 to 1.

[0035] The difference between 1 and the first circuit weight factor is used as the first environment weight factor.

[0036] According to the technical solution provided in this application, the method further includes the following steps:

[0037] Obtain the environmental aging reference values ​​for the N-1 consecutive reference accounting periods preceding the target accounting period, and form an environmental aging reference value sequence together with the environmental aging reference values ​​for the target accounting period;

[0038] Based on the environmental aging reference value sequence, a second environmental weighting factor is obtained, and then a second circuit weighting factor is obtained.

[0039] The process of integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle to generate a safe operating value includes the following steps:

[0040] Based on the second circuit weight factor and the second environment weight factor, the circuit aging reference value and the environmental aging reference value for the target accounting period are weighted and fused to generate a safe operating value.

[0041] According to the technical solution provided in this application, the step of obtaining a second environmental weighting factor based on the environmental aging reference value sequence, and then obtaining a second circuit weighting factor, includes the following steps:

[0042] The difference between the maximum and minimum values ​​of the environmental aging reference values ​​in the environmental aging reference value sequence is calculated as the intensity of environmental fluctuations.

[0043] The number of times the environmental aging reference value in the environmental aging reference value sequence exceeds a preset risk threshold is counted as a high-frequency anomaly count;

[0044] Based on the intensity of the environmental fluctuations and the count of high-frequency anomalies, the second environmental weight factor is obtained, and the second environmental weight factor belongs to the range of 0 to 1;

[0045] The difference between 1 and the second environmental weight factor is used as the second circuit weight factor.

[0046] According to the technical solution provided in this application, obtaining the second environmental weighting factor based on the environmental fluctuation intensity and the high-frequency anomaly count includes the following steps:

[0047] If the maximum value in the environmental aging reference value sequence is not the environmental aging reference value of the target accounting period, then the second environmental weighting factor is obtained based on the environmental fluctuation intensity and the high-frequency anomaly count.

[0048] Compared with existing technologies, the beneficial effects of this application are as follows: This application achieves the following significant advantages by systematically quantifying the cumulative effects of circuit overload aging and environmental corrosion aging, and integrating them to generate a comprehensive safe operating value:

[0049] I. Precise Quantification of Cumulative Aging Risk: By statistically analyzing the first cumulative duration of core overheating and the second cumulative duration of microclimate anomalies, and incorporating these durations as parameters in the calculation, this method overcomes the limitations of traditional threshold methods that only focus on instantaneous conditions. This approach accurately reflects the degree of gradual degradation of equipment materials caused by continuous operation under excessive conditions within the target accounting cycle, significantly improving the accuracy of risk identification.

[0050] II. Differentiate the Aging Drivers and Locate the Root Cause: Independently calculating circuit aging reference values ​​(based on current, voltage, wire core temperature, and duration of overheating) and environmental aging reference values ​​(based on air temperature and humidity and duration of microclimate anomalies) can clearly distinguish whether the primary cause of aging is internal electrical overload or corrosion from the enclosure environment. This provides precise basis for maintenance decisions: if circuit aging is the primary cause, load optimization or connection inspection is required; if environmental aging is the primary cause, heat dissipation or dehumidification measures should be strengthened to reduce the risk of failure at its source.

[0051] III. Generation of Integrated Safety Operation Indicators: By integrating circuit and environmental aging reference values, a safe operation value is derived, constructing an intuitive and comprehensive quantitative indicator for equipment health. This value directly characterizes the comprehensive aging accumulation status and safety level of the combiner box under high-voltage conditions, enabling operators to quickly assess the remaining lifespan of the equipment and formulate preventive maintenance plans (such as maintenance priority ranking), avoiding misjudgments or response delays caused by the mixed sources of risk in traditional solutions.

[0052] IV. Adapting to the Reliability Requirements of High-Voltage Systems: Addressing the high sensitivity of 800V systems to issues such as insulation aging and increased contact resistance, this method quantifies the cumulative effect to predict progressive failure hazards that traditional instantaneous protection cannot detect. Especially under fluctuating loads from new energy sources and in high-humidity, high-heat environments, it can effectively prevent severe accidents such as breakdown and fire caused by long-term cumulative deterioration, significantly improving the long-term operational reliability and safety of high-voltage systems.

[0053] V. Optimize Full Lifecycle Management: Based on periodically generated safe operating values ​​and their changing trends, equipment aging prediction models can be established, driving the shift in operation and maintenance from reactive maintenance to predictive maintenance. This not only reduces power outage losses and repair costs caused by sudden failures but also extends the service life of critical equipment, providing data support for the full lifecycle management of high-value power assets. Attached Figure Description

[0054] Figure 1 A flowchart illustrating the steps of the safe operation and management method for the 800V AC / DC combiner box provided in this application. Detailed Implementation

[0055] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0056] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0057] Example 1

[0058] As mentioned in the background section, this application proposes a method for safe operation and management of an 800V AC / DC combiner box, addressing the problems in the existing technology. Figure 1 As shown, it includes the following steps:

[0059] S1. Retrieve the historical operating sequence of the combiner box within the target accounting period. The historical operating sequence includes multiple historical operating times and operating parameters at each historical operating time. The operating parameters include the current value, voltage value, and core temperature value of the internal circuit, as well as the air temperature and humidity value inside the box.

[0060] S2. Calculate the first cumulative duration of the core temperature value exceeding the preset rated temperature value and the second cumulative duration of the abnormal microclimate inside the box within the target calculation period. The abnormal microclimate inside the box includes the air temperature value exceeding the first preset temperature or the air humidity value exceeding the first preset humidity.

[0061] S3. Based on the current value, voltage value, core temperature value, and first cumulative duration at multiple historical operating times, obtain the circuit aging reference value for the target calculation cycle;

[0062] S4. Based on the air temperature and air humidity values ​​at multiple historical operating times, and the second cumulative duration, obtain the environmental aging reference value for the target accounting cycle;

[0063] S5. Integrate the circuit aging reference value and the environmental aging reference value of the target accounting cycle to generate a safe operating value.

[0064] Specifically, the target accounting period is the retrospective statistical time period set by the system (such as the most recent 24 hours, 30 days, or a maintenance cycle). A sliding window mechanism is used, automatically scrolling forward at fixed intervals. The historical operation sequence is time-series data extracted from the monitoring system (such as SCADA). The microclimate anomaly inside the enclosure is defined as an air temperature value > 55℃ (first preset temperature) or humidity > 85%RH (first preset humidity). This threshold is set according to the GB / T 7251 standard. The circuit / environment aging reference value is a dimensionless coefficient (0~1), with a larger value indicating a higher aging risk. Complete operating parameters for all sampling times within the target accounting period (such as 30 days) are retrieved from the historical operation log, including: circuit parameters: three-phase current value (unit: A), line voltage value (unit: V), and core temperature collected by the infrared sensor (unit: ℃); and environmental parameters: air temperature (unit: ℃) and humidity (unit: %RH) collected by the temperature and humidity sensor. Over-limit duration statistics: First cumulative duration: Accumulate the time segments where the temperature of all conductors exceeds 90℃ (preset rated temperature value) (e.g., if each over-temperature duration lasts 10 minutes, then accumulate 10 minutes). Second cumulative duration: Accumulate the time of abnormal microclimate within the enclosure (e.g., the duration of the above-mentioned ambient temperature value > 55℃ or ambient humidity value > 85%RH). The safe operating value is a comprehensive assessment of the safe operating status of the combiner box within the target accounting period. It integrates circuit aging reference values ​​(reflecting the degree of aging of the circuit itself due to factors such as current, voltage, and conductor temperature exceeding limits) and environmental aging reference values ​​(reflecting the impact of environmental factors caused by abnormal microclimate within the enclosure on equipment aging). Therefore, the safe operating value can be understood as a quantitative assessment of the overall aging degree or safety risk of the combiner box within this accounting period, used for subsequent lifespan prediction, early warning, etc.

[0065] In a preferred embodiment, obtaining the circuit aging reference value based on the current value, voltage value, core temperature value, and the first cumulative duration at multiple historical operating times includes the following steps:

[0066] The intensity of the Joule heating effect is calculated based on the current values ​​at multiple historical operating times.

[0067] Based on the voltage values ​​at multiple historical operating times, the voltage deviation is determined, wherein the voltage deviation is the frequency or average extent of the voltage value exceeding the rated voltage range;

[0068] Based on the first cumulative duration, the intensity of the Joule heating effect, and the voltage deviation, the circuit aging reference value is calculated using a circuit aging model.

[0069] Specifically, the thermal effect intensity at each sampling time is calculated using the following formula: Thermal effect intensity at time = Where I1, I2, and I3 represent the three-phase current (unit: A), and R represents the resistance per unit length of the cable (preset to 0.02Ω / m). The arithmetic mean of the thermal effect intensity at all moments within the cycle is taken as the final Joule thermal effect intensity. Voltage deviation can be calculated in the following ways: statistically analyze the percentage (frequency) of abnormal voltages exceeding the rated range (800V±5%, i.e., 760V~840V), voltage deviation = number of abnormalities / total number of samplings; input the Joule thermal intensity, voltage deviation, and first cumulative duration into the circuit aging model, and output the circuit aging reference value.

[0070] Furthermore, the circuit aging model satisfies the following constraints:

[0071] The circuit aging reference value increases monotonically with the increase of the Joule heating effect intensity, the extension of the first cumulative duration, or the increase of the voltage deviation.

[0072] When the voltage deviation is greater than a first preset threshold, the growth rate of the circuit aging reference value is higher than its growth rate when the voltage deviation is less than or equal to the first preset threshold.

[0073] Specifically, since Joule heating is positively correlated with the rate of insulation aging and voltage deviation accelerates dielectric loss, quantifying the contribution of current / voltage anomalies to aging can predict insulation failure earlier than with single temperature monitoring.

[0074] Alternatively, a circuit aging model that satisfies the constraints is given below:

[0075] ;

[0076] Among them, C 老化 Indicates the circuit aging reference value, C 老化 ∈[0,1],J 热 J represents the intensity of the Joule heating effect. ref This represents the reference value for thermal intensity, which is the maximum allowable thermal intensity under rated operating conditions: corresponding to the heating power of the conductor under safe current carrying capacity, D. 压 Indicates voltage deviation, T1 represents the first cumulative duration, Tref This represents a time reference value, indicating the equipment's design life: the expected total operating hours under standard operating conditions. This indicates a voltage deviation from the threshold, physically meaning the critical value for triggering the synergistic effect: when D 压 >θ accelerates thermal aging; this is determined by engineering experience. This represents the cooperative acceleration coefficient, which physically represents the electro-thermal stress coupling gain. It only applies when D... 压 Activation occurs when the voltage deviation exceeds θ, otherwise it is 0. The activation value can be set to 1.5 when the voltage deviation exceeds 10%. k1, k2, and k3 represent the thermal stress weight, voltage stress weight, and time accumulation weight, respectively, and are calibrated using aging test data. Example values: k1=0.4, k2=0.3, k3=0.15. =0.

[0077] In a preferred embodiment, obtaining the environmental aging reference value based on the air temperature and humidity values ​​at multiple historical operating times, and the second cumulative duration, includes the following steps:

[0078] Based on the air temperature values ​​at multiple historical operating times, a temperature exceedance characteristic value is determined. The temperature exceedance characteristic value is the frequency or average exceedance of the air temperature value exceeding a first preset temperature.

[0079] Based on the air humidity values ​​at multiple historical operating times, a humidity exceeding characteristic value is determined, wherein the humidity exceeding characteristic value is the frequency or average exceeding range of the air humidity value exceeding a first preset humidity.

[0080] Based on the second cumulative duration, the temperature exceeding the limit characteristic value, and the humidity exceeding the limit characteristic value, the environmental aging reference value is calculated using an environmental aging model.

[0081] Furthermore, the environmental aging model satisfies the following constraints:

[0082] The environmental aging reference value increases monotonically as the temperature exceeding the limit characteristic value increases, the humidity exceeding the limit characteristic value increases, or the second cumulative duration increases.

[0083] The temperature exceeding the limit characteristic value and the humidity exceeding the limit characteristic value have a synergistic gain relationship on the aging acceleration effect. The synergistic gain relationship indicates that when both exceed the limit simultaneously, the growth rate of the environmental aging reference value is higher than the sum of the growth rates when they exceed the limit individually.

[0084] Alternatively, the environmental aging model is as follows:

[0085] ;

[0086] Among them, C env Indicates the environmental aging reference value, C env ∈[0,1], T2 represents the second cumulative duration, T ex H represents the temperature exceeding the limit characteristic value. ex T represents the characteristic value of humidity exceeding the limit. ref Indicates environmental design life, Represents the cooperative gain coefficient, when T ex >0 and H ex When the product term is greater than 0, the nonlinear acceleration is activated; otherwise... The value should be 0. Typical activation values ​​need to be calibrated experimentally; a range of 1.0-2.0 is possible. This represents the cumulative weighting over time and the weighting under environmental stress. It is determined through accelerated aging tests. , (e.g., testing the degradation rate of insulation materials at a temperature of 40℃ and a humidity of 90%RH). Example values: α=0.18, β=0.28, γ=1.5 (when the synergistic effect of heat and humidity is significant).

[0087] In a preferred embodiment, the method further includes the following steps:

[0088] Obtain the circuit aging reference values ​​for the preceding N-1 consecutive reference accounting cycles adjacent to the target accounting cycle, and form a circuit aging reference value sequence together with the circuit aging reference values ​​for the target accounting cycle;

[0089] Based on the circuit aging reference value sequence, a first circuit weight factor is generated, and then a first environmental weight factor is obtained.

[0090] The process of integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle to generate a safe operating value includes the following steps:

[0091] Based on the first circuit weight factor and the first environment weight factor, the circuit aging reference value and the environmental aging reference value for the target accounting cycle are weighted and fused to generate a safe operating value.

[0092] Specifically, the target accounting cycle and the adjacent N-1 consecutive reference accounting cycles together form N accounting cycles (N is greater than or equal to 4). They all have the same duration. The specific implementation process is as follows: retrieve the circuit aging reference values ​​(C1~C4) of the target accounting cycle and the preceding N-1 reference accounting cycles (N=4 example) from the database, construct the circuit aging sequence, and the example circuit aging reference value sequence is: [0.25, 0.31, 0.38, 0.45] (where the circuit aging reference value of the target accounting cycle is 0.45).

[0093] Further, the step of generating a first circuit weight factor based on the circuit aging reference value sequence, and then obtaining a first environmental weight factor, includes the following steps:

[0094] Calculate the direction of change of the circuit aging reference value in every two adjacent calculation cycles in the circuit aging reference value sequence; wherein, if the circuit aging reference value in the later calculation cycle is greater than the circuit aging reference value in the previous calculation cycle, it is recorded as a positive change, and otherwise it is recorded as a negative change.

[0095] The proportion of positive changes in the circuit aging reference value sequence to the total number of changes is used as the continuous degradation rate.

[0096] Calculate the average aging value of the circuit aging reference value for all historical accounting periods, and take the absolute value of the difference between the circuit aging reference value for the target accounting period and the average aging value as the current deviation.

[0097] Based on the continuous degradation rate and the current deviation, a first circuit weight factor is obtained, which belongs to the range of 0 to 1.

[0098] The difference between 1 and the first circuit weight factor is used as the first environment weight factor.

[0099] Specifically, the purpose of this implementation is to quantify circuit weights through degradation trends and deviations. The continuous degradation rate is the percentage of consecutive growth cycles of the circuit aging reference value, and the current deviation is the fluctuation range of the target value compared to the historical average. Detailed implementation steps: Calculate the direction of change: Circuit aging reference value sequence [C1,C2,C3,C4]=[0.25,0.31,0.38,0.45], change pairs: (C2-C1)=+0.06 (positive), (C3-C2)=+0.07 (positive), (C4-C3)=+0.07 (positive), number of positive changes=3, total number of changes=3, continuous degradation rate is 1.0; Calculate the deviation: Historical average value C - =(0.25+0.31+0.38) / 3=0.313, current deviation =|0.45−0.313|=0.137; the first circuit weight factor is obtained through the following formula: Among them, W c1 This represents the weighting factor of the first circuit, where α and β are adjustment coefficients (default 0.6, 0.4), and D... max Indicates the maximum permissible deviation (default 0.2), D c R represents the current deviation. d This represents the rate of continuous degradation. Therefore, the first environmental weighting factor... .

[0100] In a preferred embodiment, the method further includes the following steps:

[0101] Obtain the environmental aging reference values ​​for the N-1 consecutive reference accounting periods preceding the target accounting period, and form an environmental aging reference value sequence together with the environmental aging reference values ​​for the target accounting period;

[0102] Based on the environmental aging reference value sequence, a second environmental weighting factor is obtained, and then a second circuit weighting factor is obtained.

[0103] The process of integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle to generate a safe operating value includes the following steps:

[0104] Based on the second circuit weight factor and the second environment weight factor, the circuit aging reference value and the environmental aging reference value for the target accounting period are weighted and fused to generate a safe operating value.

[0105] Further, the process of obtaining a second environmental weighting factor based on the environmental aging reference value sequence, and subsequently a second circuit weighting factor, includes the following steps:

[0106] The difference between the maximum and minimum values ​​of the environmental aging reference values ​​in the environmental aging reference value sequence is calculated as the intensity of environmental fluctuations.

[0107] The number of times the environmental aging reference value in the environmental aging reference value sequence exceeds a preset risk threshold is counted as a high-frequency anomaly count;

[0108] Based on the intensity of the environmental fluctuations and the count of high-frequency anomalies, the second environmental weight factor is obtained, and the second environmental weight factor belongs to the range of 0 to 1;

[0109] The difference between 1 and the second environmental weight factor is used as the second circuit weight factor.

[0110] Specifically, this implementation method assigns weights in reverse based on environmental fluctuation characteristics. The second environmental weight factor represents the dynamic weight of environmental aging. It takes the environmental aging reference values ​​from the target accounting period and the previous three reference accounting periods to form an environmental aging reference value sequence, for example: [0.48, 0.52, 0.61, 0.73] (the environmental aging reference value for the target accounting period is 0.73). The weights are quantified by environmental fluctuation intensity and anomaly frequency. Environmental fluctuation intensity represents the sequence range (maximum value - minimum value), and high-frequency anomaly count represents the number of times the risk threshold is exceeded. Detailed implementation steps: Calculate environmental fluctuation intensity: For the sequence [0.48, 0.52, 0.61, 0.73], environmental fluctuation intensity = 0.73 − 0.48 = 0.25. Statistical anomaly count: The preset risk threshold = 0.6. Values ​​exceeding 0.6 in the sequence: 0.61, 0.73. Therefore, the high-frequency anomaly count = 2. The environmental weight factor is calculated using the following formula:

[0111] ,in, V represents the adjustment factor (default 0.5, 0.5). max Indicates the maximum permissible environmental fluctuation, set according to the equipment's tolerance level, N. t N represents the total number of accounting periods in the environmental aging reference value series. a V represents the high-frequency anomaly count. e Indicates the intensity of environmental fluctuations.

[0112] In a preferred embodiment, obtaining the second environmental weighting factor based on the environmental fluctuation intensity and the high-frequency anomaly count includes the following steps:

[0113] If the maximum value in the environmental aging reference value sequence is not the environmental aging reference value of the target accounting period, then the second environmental weighting factor is obtained based on the environmental fluctuation intensity and the high-frequency anomaly count.

[0114] Specifically, considering that when environmental parameters exceed historical extremes, the aging rate may experience a step increase (non-linear region), and the contribution of environmental factors needs to be amplified exponentially, if the maximum value is not in the target accounting period, the second environmental weight factor calculated above is directly used; if the maximum value is in the target accounting period, the second environmental weight factor calculated above is strengthened. This is a risk compensation mechanism for the non-linear range of material aging.

[0115] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A method for safe operation management of an 800V AC / DC combiner box, characterized in that, Includes the following steps: Retrieve the historical operating sequence of the combiner box within the target accounting period. The historical operating sequence includes multiple historical operating times and operating parameters at each historical operating time. The operating parameters include the current value, voltage value, and core temperature value of the internal circuit, as well as the air temperature and humidity value inside the box. The first cumulative duration during which the core temperature value exceeds the preset rated temperature value and the second cumulative duration of abnormal microclimate inside the box are calculated within the target calculation period. The abnormal microclimate inside the box includes the air temperature value exceeding the first preset temperature or the air humidity value exceeding the first preset humidity. Based on the current value, voltage value, core temperature value, and first cumulative duration at multiple historical operating times, the circuit aging reference value for the target calculation cycle is obtained; Based on the air temperature and humidity values ​​at multiple historical operating times, and the second cumulative duration, the environmental aging reference value for the target accounting cycle is obtained. By integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle, a safe operating value is generated. The method also includes the following steps: Obtain the circuit aging reference values ​​for the preceding N-1 consecutive reference accounting cycles adjacent to the target accounting cycle, and form a circuit aging reference value sequence together with the circuit aging reference values ​​for the target accounting cycle; Based on the circuit aging reference value sequence, a first circuit weight factor is generated, and then a first environmental weight factor is obtained. The process of integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle to generate a safe operating value includes the following steps: Based on the first circuit weight factor and the first environment weight factor, the circuit aging reference value and the environmental aging reference value for the target accounting cycle are weighted and fused to generate a safe operating value.

2. The method for safe operation management of an 800V AC / DC combiner box according to claim 1, characterized in that: The step of obtaining circuit aging reference values ​​based on the current values, voltage values, core temperature values, and the first cumulative duration at multiple historical operating times includes the following steps: The intensity of the Joule heating effect is calculated based on the current values ​​at multiple historical operating times. Based on the voltage values ​​at multiple historical operating times, the voltage deviation is determined, wherein the voltage deviation is the frequency or average extent of the voltage value exceeding the rated voltage range; Based on the first cumulative duration, the intensity of the Joule heating effect, and the voltage deviation, the circuit aging reference value is calculated using a circuit aging model.

3. The method for safe operation management of an 800V AC / DC combiner box according to claim 2, characterized in that: The circuit aging model satisfies the following constraints: The circuit aging reference value increases monotonically with the increase of the Joule heating effect intensity, the extension of the first cumulative duration, or the increase of the voltage deviation. When the voltage deviation is greater than a first preset threshold, the growth rate of the circuit aging reference value is higher than its growth rate when the voltage deviation is less than or equal to the first preset threshold.

4. The method for safe operation management of an 800V AC / DC combiner box according to claim 1, characterized in that: The step of obtaining the environmental aging reference value based on the air temperature and humidity values ​​at multiple historical operating times, and the second cumulative duration, includes the following steps: Based on the air temperature values ​​at multiple historical operating times, a temperature exceedance characteristic value is determined. The temperature exceedance characteristic value is the frequency or average exceedance of the air temperature value exceeding a first preset temperature. Based on the air humidity values ​​at multiple historical operating times, a humidity exceeding characteristic value is determined, wherein the humidity exceeding characteristic value is the frequency or average exceeding range of the air humidity value exceeding a first preset humidity. Based on the second cumulative duration, the temperature exceeding the limit characteristic value, and the humidity exceeding the limit characteristic value, the environmental aging reference value is calculated using an environmental aging model.

5. The method for safe operation management of an 800V AC / DC combiner box according to claim 4, characterized in that: The environmental aging model satisfies the following constraints: The environmental aging reference value increases monotonically as the temperature exceeding the limit characteristic value increases, the humidity exceeding the limit characteristic value increases, or the second cumulative duration increases. The temperature exceeding the limit characteristic value and the humidity exceeding the limit characteristic value have a synergistic gain relationship on the aging acceleration effect. The synergistic gain relationship indicates that when both exceed the limit simultaneously, the growth rate of the environmental aging reference value is higher than the sum of the growth rates when they exceed the limit individually.

6. The method for safe operation management of an 800V AC / DC combiner box according to claim 5, characterized in that: The process of generating a first circuit weight factor based on the circuit aging reference value sequence, and then obtaining a first environmental weight factor, includes the following steps: Calculate the direction of change of the circuit aging reference value in every two adjacent calculation cycles in the circuit aging reference value sequence; wherein, if the circuit aging reference value in the later calculation cycle is greater than the circuit aging reference value in the previous calculation cycle, it is recorded as a positive change, and otherwise it is recorded as a negative change. The proportion of positive changes in the circuit aging reference value sequence to the total number of changes is used as the continuous degradation rate. Calculate the average aging value of the circuit aging reference value for all historical accounting periods, and take the absolute value of the difference between the circuit aging reference value for the target accounting period and the average aging value as the current deviation. Based on the continuous degradation rate and the current deviation, a first circuit weight factor is obtained, which belongs to the range of 0 to 1. The difference between 1 and the first circuit weight factor is used as the first environment weight factor.

7. The method for safe operation management of an 800V AC / DC combiner box according to claim 1, characterized in that: Circuit weighting factors and environmental weighting factors can also be obtained through the following steps: Obtain the environmental aging reference values ​​for the N-1 consecutive reference accounting periods preceding the target accounting period, and form an environmental aging reference value sequence together with the environmental aging reference values ​​for the target accounting period; Based on the environmental aging reference value sequence, a second environmental weighting factor is obtained, and then a second circuit weighting factor is obtained. The process of integrating the circuit aging reference value and the environmental aging reference value for the target accounting cycle to generate a safe operating value includes the following steps: Based on the second circuit weight factor and the second environment weight factor, the circuit aging reference value and the environmental aging reference value for the target accounting period are weighted and fused to generate a safe operating value.

8. The method for safe operation management of an 800V AC / DC combiner box according to claim 7, characterized in that: The process of obtaining a second environmental weighting factor and subsequently a second circuit weighting factor based on the environmental aging reference value sequence includes the following steps: The difference between the maximum and minimum values ​​of the environmental aging reference values ​​in the environmental aging reference value sequence is calculated as the intensity of environmental fluctuations. The number of times the environmental aging reference value in the environmental aging reference value sequence exceeds a preset risk threshold is counted as a high-frequency anomaly count; Based on the intensity of the environmental fluctuations and the count of high-frequency anomalies, the second environmental weight factor is obtained, and the second environmental weight factor belongs to the range of 0 to 1; The difference between 1 and the second environmental weight factor is used as the second circuit weight factor.

9. The method for safe operation management of an 800V AC / DC combiner box according to claim 8, characterized in that: The process of obtaining the second environmental weighting factor based on the environmental fluctuation intensity and the high-frequency anomaly count includes the following steps: If the maximum value in the environmental aging reference value sequence is not the environmental aging reference value of the target accounting period, then the second environmental weighting factor is obtained based on the environmental fluctuation intensity and the high-frequency anomaly count.

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