System and method for monitoring service life of storage battery of DC screen of power distribution network

Abstract

The invention provides a power distribution network direct current screen storage battery life monitoring system and method, and the system comprises a control module, a data collection module, a life detection operation module, an early warning module and a storage module. The service life detection operation is automatically carried out at the end of countdown; the data acquisition module periodically acquires voltage and current data during detection, and the life detection operation module calculates the life cycle value of the storage battery according to the data; the early warning module compares the calculated life cycle value with an early warning threshold value so as to realize monitoring of the life state of the storage battery and early warning of faults; the storage module is used for recording detection results and related time information.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current panel batteries, and in particular to a distribution network direct current panel battery life monitoring system and method thereof. Background Art

[0002] In the power system, the distribution DC panel battery is an important backup power source, and its performance and life directly affect the stable operation of the power system. At present, the service life of the battery is often difficult to accurately predict, resulting in battery failure before the expected life, thus affecting the normal operation of the power system. Therefore, it is necessary to study a system that can monitor the battery life in real time and realize early warning. Summary of the invention

[0003] The purpose of the present invention is to provide a battery life monitoring system and method for a DC panel in a distribution network to solve the above-mentioned problems.

[0004] To achieve the above object, the present invention provides a distribution network DC panel battery life monitoring system, comprising:

[0005] A control module is used to set the frequency of life detection of the DC panel battery. When the DC panel battery changes from the equalization charge state to the floating charge state and the charging current is 0, the life monitoring countdown begins. When the count reaches a preset threshold, the life detection operation is automatically started;

[0006] A data acquisition module, used for sampling the voltage and current of the DC panel battery at predetermined time intervals during the life detection operation;

[0007] A life detection calculation module, used to calculate the life cycle value of the DC panel battery according to the sampled voltage and current;

[0008] An early warning module is used to compare the life cycle value with a preset early warning threshold value, and display the battery life detection result or issue a battery failure alarm according to the comparison result;

[0009] The storage module is used to record the life test results and test time.

[0010] Preferably, the life detection calculation module includes:

[0011] Timing unit, used to start timing from the beginning of entering the life detection budget, in seconds;

[0012] The first calculation unit is used to calculate the current when the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current;

[0013] The second calculation unit is used to calculate the current when the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 When the collected current voltage is less than 11.5V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current.

[0014] Preferably, the first calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula:

[0015] X=(I×S÷3600)÷I 限流 ×2×100%

[0016] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0017] Preferably, the second calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula:

[0018] X=(I×S÷3600)÷I 限流 ×2×100%+5%

[0019] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0020] Preferably, the early warning module is used to display the life detection result of the DC panel battery when the life cycle value is greater than or equal to the early warning threshold; when the life cycle value is less than the early warning threshold, issue a fault alarm for the DC panel battery.

[0021] As the same inventive concept, the present invention also provides a method for monitoring the life of a battery in a DC panel of a distribution network, comprising:

[0022] According to the set DC panel battery life detection frequency, when the DC panel battery changes from the equalization charge state to the floating charge state and the charging current is 0, the life monitoring countdown begins, and when the count reaches the preset threshold, the life detection operation is automatically started;

[0023] During the life detection operation, sampling the voltage and current of the DC panel battery at predetermined time intervals;

[0024] Calculate the life cycle value of the DC panel battery according to the sampled voltage and current;

[0025] Compare the life cycle value with a preset warning threshold, and display the battery life test result or issue a battery failure alarm according to the comparison result;

[0026] Record the life test results and test time.

[0027] Preferably, the calculating the life cycle value of the DC panel battery according to the sampled voltage and current includes:

[0028] The time is counted in seconds from the start of entering the life detection budget;

[0029] When the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current;

[0030] When the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 When the collected current voltage is less than 11.5V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current.

[0031] Preferably, when the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, the life cycle value of the DC panel battery is calculated according to the current timing time and the current current as shown in the following formula:

[0032] X=(I×S÷3600)÷I 限流 ×2×100%

[0033] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0034] Preferably, when the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 , and when the collected current voltage is less than 11.5V, the life cycle value of the DC panel battery is calculated according to the current timing time and the current current as shown in the following formula:

[0035] X=(I×S÷3600)÷I 限流 ×2×100%+5%

[0036] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0037] Preferably, displaying the battery life detection result or issuing a battery failure alarm according to the comparison result includes:

[0038] When the life cycle value is greater than or equal to the warning threshold, the life detection result of the DC panel battery is displayed;

[0039] When the life cycle value is less than the warning threshold, the DC panel battery failure alarm is issued.

[0040] The system and method of the present invention have the following beneficial effects:

[0041] The system and method of the present invention can monitor the life status of the battery in real time and improve the reliability of the backup power supply of the power system; by comparing the life cycle value with the warning threshold, the potential failure risk of the battery can be discovered in advance, providing a basis for maintenance work; the automated life detection operation reduces manual intervention and improves detection efficiency and accuracy; the detection results and detection time recorded by the storage module are helpful for historical analysis and trend prediction of battery performance; through effective monitoring of the battery life, it can be ensured that the power system can rely on a stable backup power supply at critical moments, thereby ensuring the normal operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 The present invention is a structural diagram of a battery life monitoring system for a DC panel in a distribution network according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The detailed description of the accompanying drawings is intended as an illustration of the current embodiments of the present invention and is not intended to represent the only form in which the present invention can be implemented. It should be understood that the same or equivalent functions can be accomplished by different embodiments that are intended to be included in the spirit and scope of the present invention.

[0045] See also Figure 1 One embodiment of the present invention provides a battery life monitoring system for a DC panel in a distribution network, comprising:

[0046] The control module 1 is used to set the frequency of the DC panel battery life detection. When the DC panel battery changes from the equalizing charge state to the floating charge state and the charging current is 0, the life monitoring countdown begins. When the countdown reaches a preset threshold, the life detection operation is automatically started. Specifically, the control module first sets the frequency of the DC panel battery life detection, that is, determines the periodicity of the system's life detection. When the DC panel battery changes from the equalizing charge state (a charging mode in which the battery is charged to full capacity) to the floating charge state (a charging mode that maintains the battery in a fully charged state) and the charging current is 0, the control module starts the life monitoring countdown. This state transition point is a suitable monitoring starting point because the battery has completed the charging process at this time and can more accurately reflect its status. When the countdown reaches the preset threshold, that is, when the set detection time point is reached, the control module automatically starts the life detection operation.

[0047] The data acquisition module 2 is used to sample the voltage and current of the DC battery at predetermined time intervals during the life detection operation. Specifically, during the life detection operation, the data acquisition module samples the voltage and current of the DC battery at predetermined time intervals. These data are key parameters for evaluating the battery life status. The sampling frequency and time interval need to be determined according to the characteristics of the battery and the requirements of monitoring accuracy.

[0048] The life detection operation module 3 is used to calculate the life cycle value of the DC panel battery based on the sampled voltage and current; specifically, the life detection operation module uses the voltage and current data provided by the data acquisition module to calculate the life cycle value of the battery through a specific algorithm, and these algorithms include a comprehensive analysis of factors such as battery internal resistance, capacity attenuation, and charge and discharge cycle times; the life cycle value is an indicator that characterizes the current life status of the battery, which can be a predicted value based on a battery aging model, or calculated based on the battery performance degradation trend.

[0049] The early warning module 4 is used to compare the life cycle value with a preset early warning threshold value, and display the battery life detection result or issue a battery fault alarm based on the comparison result; specifically, the early warning module compares the calculated life cycle value with the preset early warning threshold value, and the early warning threshold value is pre-set based on the design life, performance requirements and safety standards of the battery; if the life cycle value is lower than the early warning threshold value, the early warning module will take action based on the comparison result, which includes displaying the battery life detection result, reminding maintenance personnel to pay attention to the health status of the battery, or issuing a battery fault alarm when a potential fault risk is detected.

[0050] The storage module 5 is used to record the life test results and test time; specifically, the storage module is responsible for recording the results of each life test and the corresponding test time. These data are very important for tracking the performance degradation trend of the battery, arranging maintenance plans, and performing fault analysis; the recorded information can be stored in a local or remote database to facilitate data analysis and long-term monitoring.

[0051] The embodiment of the present invention can realize real-time monitoring and early warning of the battery life of the DC panel of the distribution network, thereby ensuring the stable operation of the power system.

[0052] Furthermore, the life detection calculation module 3 includes:

[0053] The timing unit is used to start timing from the beginning of the life detection budget, in seconds; specifically, the timing unit starts timing when the life detection calculation module starts the life detection budget, and the timing unit is in seconds. This timing process is to record the length of time from the start of detection to the time when a specific condition is met. This time length is an important parameter for the subsequent calculation of the battery life cycle value. The first calculation unit is used when the current current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current; specifically,

[0054] The first calculation unit is responsible for monitoring the current and voltage data provided by the data acquisition unit, and determining whether specific conditions are met. The specific conditions here are that the current current is less than 2 times I current limit (I current limit refers to the current limit value of the battery, usually the maximum current that the battery can safely withstand), and the collected voltage is less than 11.7V. When these two conditions are met at the same time, the first calculation unit will stop the timing of the timing unit, because at this time the battery has reached or is close to the end of its discharge state, and the current and voltage in this state can be used to evaluate the performance of the battery; after stopping the timing, the first calculation unit will calculate the life cycle value of the battery based on the current timing time and current current recorded by the timing unit. This calculation involves parameters such as the internal resistance and capacity attenuation of the battery, and the time and current data are converted into a life cycle value through a specific algorithm.

[0055] The second calculation unit is used to calculate the current when the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 , and when the collected current and voltage are less than 11.5V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current; Specifically, the second calculation unit also monitors the current and voltage data provided by the data acquisition unit, and determines whether another set of specific conditions are met, where the condition is that the current current is greater than or equal to 2 times I 限流, and the collected voltage is less than 11.5V. This set of conditions indicates that the battery is undergoing a more serious discharge process, or the battery performance has significantly decreased; when these two conditions are met at the same time, the second calculation unit will also stop the timing of the timing unit, and use the current timing time and current current to calculate the life cycle value of the battery. The calculation method here is similar to the first calculation unit, but considering that the battery is in a more serious discharge state, the algorithm will be different. Take a 50Ah20hr battery as an example, the charging limit is set to 5.0A, and the battery characteristic is selected as 20hr (i.e., a 20-hour rate battery).

[0056] Through the work of these two calculation units, the present invention can more accurately evaluate the life status of the battery according to the current and voltage data of the battery under specific conditions. This life cycle value calculation method based on real-time data and specific conditions can improve the accuracy and reliability of the monitoring system, thereby providing guarantee for the stable operation of the power system.

[0057] Furthermore, the first calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula:

[0058] X=(I×S÷3600)÷I 限流 ×2×100%

[0059] X: is the life cycle value we want to calculate, which is a percentage that represents the ratio of the actual discharge capacity of the battery to its maximum capacity;

[0060] I: current current, that is, the average current of the battery during discharge, in amperes (A);

[0061] S: current timing time, i.e. the duration of the battery discharge process, in seconds (s);

[0062] 3600: This is a conversion factor used to convert time from seconds to hours, as 1 hour is equal to 3600 seconds;

[0063] I current limit: the set charging current limit value, which is the maximum current allowed by the battery during the charging process, in amperes (A);

[0064] I×S: This is the product of the discharge current (I) and the discharge time (S), which gives the total discharge capacity (ampere-seconds, A·s);

[0065] I×S÷3600: Divide the total discharge capacity by 3600, convert the time unit from seconds to hours, and get the actual discharge capacity (ampere-hour, Ah);

[0066] (I×S÷3600)÷I current limit: Divide the actual discharge capacity by the charge current limit to get a ratio that represents the relationship between the actual discharge capacity and the charge current limit.

[0067] ×2: Because the system defaults to discharge to 50%, multiply the ratio obtained in the previous step by 2 to estimate the equivalent capacity if the battery is fully discharged (from 100% to 0%);

[0068] ×100%: Finally, multiply the obtained ratio by 100% to convert it into a percentage form, so that X is the life cycle value, which represents the percentage of the actual discharge capacity relative to the maximum capacity of the battery;

[0069] In summary, this formula is used to calculate the life cycle value of the DC panel battery. It evaluates the health status and remaining life of the battery by comparing the actual discharge capacity with the maximum capacity of the battery (assuming it is equal to the capacity corresponding to the charging current limit value) and taking into account the situation where the battery is only discharged to 50%.

[0070] Furthermore, the second calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula:

[0071] X=(I×S÷3600)÷I 限流 ×2×100%+5%

[0072] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0073] Specifically, compared with the calculation formula of the first calculation unit, the calculation formula of the second calculation unit introduces a correction coefficient of 5% in order to correct the influence of the current limiting of I≥2×I.

[0074] Furthermore, the warning module 4 is used to display the life detection result of the DC panel battery when the life cycle value is greater than or equal to the warning threshold; when the life cycle value is less than the warning threshold, the DC panel battery fault alarm is issued.

[0075] Specifically, the main function of the early warning module is to compare the life cycle value with the preset early warning threshold and take corresponding measures according to the comparison result; the early warning threshold is a pre-set value, which represents the critical point of the battery life cycle value. Exceeding this point indicates that the performance of the battery has dropped to a level that requires attention. The life cycle value is calculated by the life detection operation module, which reflects the current life status of the battery. When the calculated life cycle value is greater than or equal to the early warning threshold, the early warning module will display the battery life detection result. This result display is realized through a user interface (UI), such as on the monitoring screen in the control room or through the interface of the remote monitoring system. The displayed information includes the specific value of the life cycle value, the battery status and the required maintenance suggestions.

[0076] When the life cycle value is less than the warning threshold, the warning module will trigger a fault alarm, which usually means that the battery has performance problems or failures and needs to be checked or replaced immediately; the fault alarm can be achieved through sound and light alarms, sending alarm messages to the maintenance personnel's mobile phone or email, or marking the problematic battery in the monitoring system.

[0077] Through such an early warning mechanism, the embodiment of the present invention can monitor the status of the battery in real time and promptly notify maintenance personnel when the battery performance drops to a certain level, so that corresponding measures can be taken to ensure the stable operation of the power system. This early warning system helps prevent power system interruptions caused by battery failures, thereby improving the reliability and safety of the power system.

[0078] As the same inventive concept, another embodiment of the present invention also provides a method for monitoring the life of a battery in a DC panel of a distribution network, comprising the following steps:

[0079] Step S10, according to the set DC panel battery life detection frequency, when the DC panel battery changes from the equalization charge state to the floating charge state and the charging current is 0, the life monitoring countdown begins, and when the count reaches the preset threshold, the life detection operation is automatically started;

[0080] Step S20, during the life detection operation, sampling the voltage and current of the DC panel battery at predetermined time intervals;

[0081] Step S30, calculating the life cycle value of the DC panel battery according to the sampled voltage and current;

[0082] Step S40, comparing the life cycle value with a preset warning threshold, and displaying the battery life test result or issuing a battery failure alarm according to the comparison result;

[0083] Step S50, recording the life test result and the test time.

[0084] Furthermore, the step S30 includes:

[0085] The time is counted in seconds from the start of entering the life detection budget;

[0086] When the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current;

[0087] When the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 When the collected current voltage is less than 11.5V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current.

[0088] Furthermore, when the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, the life cycle value of the DC panel battery is calculated according to the current timing time and the current current as shown in the following formula:

[0089] X=(I×S÷3600)÷I 限流 ×2×100%

[0090] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0091] Furthermore, when the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 , and when the collected current voltage is less than 11.5V, the life cycle value of the DC panel battery is calculated according to the current timing time and the current current as shown in the following formula:

[0092] X=(I×S÷3600)÷I 限流 ×2×100%+5%

[0093] Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

[0094] Furthermore, the step S40 includes:

[0095] When the life cycle value is greater than or equal to the warning threshold, the life detection result of the DC panel battery is displayed;

[0096] When the life cycle value is less than the warning threshold, the DC panel battery failure alarm is issued.

[0097] It should be noted that the method of this embodiment is implemented based on the system of the above embodiment. Therefore, the contents not described in detail in the method of this embodiment can be obtained by referring to the description of the system of the above embodiment, and will not be repeated here.

[0098] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A distribution network DC panel battery life monitoring system, characterized in that: include: A control module is used to set the frequency of life detection of the DC panel battery. When the DC panel battery changes from the equalization charge state to the floating charge state and the charging current is 0, the life monitoring countdown begins. When the count reaches a preset threshold, the life detection operation is automatically started; A data acquisition module, used for sampling the voltage and current of the DC panel battery at predetermined time intervals during the life detection operation; A life detection calculation module, used to calculate the life cycle value of the DC panel battery according to the sampled voltage and current; An early warning module is used to compare the life cycle value with a preset early warning threshold value, and display the battery life detection result or issue a battery failure alarm according to the comparison result; The storage module is used to record the life test results and test time.

2. The system according to claim 1, characterized in that The life detection calculation module includes: Timing unit, used to start timing from the beginning of entering the life detection budget, in seconds; The first calculation unit is used to calculate the current when the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current; The second calculation unit is used to calculate the current when the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 When the collected current voltage is less than 11.5V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current.

3. The system according to claim 2, characterized in that The first calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula: X=(I×S÷3600)÷I 限流 ×2×100% Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

4. The system according to claim 2, characterized in that The second calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula: X=(I×S÷3600)÷I 限流 ×2×100%+5% Among them, X is the life cycle value, S is the current timing time, I is the current current, I 限流 is the set charging current limit value.

5. The system according to claim 2, characterized in that The warning module is used to display the life detection result of the DC panel battery when the life cycle value is greater than or equal to the warning threshold; when the life cycle value is less than the warning threshold, the DC panel battery fault alarm is issued.

6. A method for monitoring the battery life of a DC panel in a distribution network, characterized in that: include: According to the set DC panel battery life detection frequency, when the DC panel battery changes from the equalization charge state to the floating charge state and the charging current is 0, the life monitoring countdown begins, and when the count reaches the preset threshold, the life detection operation is automatically started; During the life detection operation, sampling the voltage and current of the DC panel battery at predetermined time intervals; Calculate the life cycle value of the DC panel battery according to the sampled voltage and current; Compare the life cycle value with a preset warning threshold, and display the battery life test result or issue a battery failure alarm according to the comparison result; Record the life test results and test time.

7. The method according to claim 6, characterized in that The method of calculating the life cycle value of the DC panel battery according to the sampled voltage and current includes: The time is counted in seconds from the start of entering the life detection budget; When the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current; When the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 When the collected current voltage is less than 11.5V, stop timing, and calculate the life cycle value of the DC panel battery according to the current timing time and the current current.

8. The method according to claim 6, characterized in that When the current sampled by the data acquisition unit is less than 2×I 限流 , and when the collected current voltage is less than 11.7V, the life cycle value of the DC panel battery is calculated according to the current timing time and the current current as shown in the following formula: X=(I×S÷3600)÷I 限流 ×2×100% Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

9. The method according to claim 6, characterized in that When the current sampled by the data acquisition unit is greater than or equal to 2×I 限流 , and when the collected current voltage is less than 11.5V, the life cycle value of the DC panel battery is calculated according to the current timing time and the current current as shown in the following formula: X=(I×S÷3600)÷I 限流 ×2×100%+5% Among them, X is the life cycle value, S is the current timing time in seconds, I is the current current in amperes, and I 限流 is the set charging current limit value, in amperes.

10. The method according to claim 6, characterized in that The method of displaying the battery life detection result or issuing a battery failure alarm according to the comparison result includes: When the life cycle value is greater than or equal to the warning threshold, the life detection result of the DC panel battery is displayed; When the life cycle value is less than the warning threshold, the DC panel battery failure alarm is issued.

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