A power distribution network direct current screen battery life monitoring system and method thereof

Abstract

The application provides a power distribution network DC screen storage battery life monitoring system and method thereof, comprising a control module, a data acquisition module, a life detection operation module, a warning module and a storage module. The system can start life monitoring countdown when the storage battery charging state is converted according to the set detection frequency, and automatically perform life detection operation when the countdown is over. 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 warning module compares the calculated life cycle value with the warning threshold to realize the monitoring of the storage battery life state and the failure warning. The storage module is used for recording the detection results and related time information.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct-current screen storage battery, and particularly relates to a power distribution network direct-current screen storage battery life monitoring system and a method thereof. BACKGROUND

[0002] In the power system, the power distribution direct-current screen storage battery as an important backup power source, its performance and life directly affect the stable operation of the power system. At present, the service life of the storage battery is often difficult to accurately predict, which leads to the failure of the storage battery before reaching the expected life, thereby affecting the normal operation of the power system. Therefore, it is necessary to study a system capable of monitoring the life of the storage battery in real time and realizing early warning. SUMMARY

[0003] The present application aims to provide a power distribution network direct-current screen storage battery life monitoring system and a method thereof to solve the above problems.

[0004] To achieve the above-mentioned purpose, the present application provides a power distribution network direct-current screen storage battery life monitoring system, comprising:

[0005] A control module is used for setting the direct-current screen storage battery life detection frequency, and when the direct-current screen storage battery is switched from the equalizing charging state to the floating charging state and the charging current is 0, entering the life monitoring countdown, and when the timing reaches the preset threshold, automatically starting the life detection operation.

[0006] A data acquisition module is used for sampling the voltage and current of the direct-current screen storage battery every predetermined time interval during the life detection operation.

[0007] A life detection operation module is used for calculating the life cycle value of the direct-current screen storage battery according to the sampled voltage and current.

[0008] A warning module is used for comparing the life cycle value with the preset warning threshold, and displaying the life detection result of the storage battery or giving a storage battery fault alarm according to the comparison result.

[0009] A storage module is used for recording the life detection result and detection time.

[0010] Preferably, the life detection operation module comprises:

[0011] A timing unit is used for timing from the start of entering the life detection budget, in seconds.

[0012] A first calculation unit is used for stopping timing when the current current sampled by the data acquisition unit is less than 2xI 限流 , and the sampled current voltage is less than 11.7V, and calculating the life cycle value of the direct-current screen storage battery according to the current timing time and current current.

[0013] a second calculation unit, configured to stop timing and calculate a service life value of the DC screen battery according to a current timing time and a current current when the current current sampled by the data acquisition unit is greater than or equal to 2xI 限流

[0014] Preferably, the first calculation unit is configured to calculate the service life value of the DC screen battery according to the following formula:

[0015] X=(IxS÷3600)÷I 限流 x2x100%

[0016] wherein X is the service life value, S is the current timing time in seconds, I is the current in amperes, and I 限流 is a set charging current limit value in amperes.

[0017] Preferably, the second calculation unit is configured to calculate the service life value of the DC screen battery according to the following formula:

[0018] X=(IxS÷3600)÷I 限流 x2x100%+5%

[0019] wherein X is the service life value, S is the current timing time in seconds, I is the current in amperes, and I 限流 is a set charging current limit value in amperes.

[0020] Preferably, the warning module is configured to display the service life detection result of the DC screen battery when the service life value is greater than or equal to a warning threshold value, and perform a fault alarm of the DC screen battery when the service life value is less than the warning threshold value.

[0021] As the same inventive concept, the application further provides a power distribution network DC screen battery service life monitoring method, comprising:

[0022] According to a set DC screen battery service life detection frequency, when the DC screen battery is switched from equalization charging to floating charging and the charging current is 0, entering service life monitoring countdown, and when the timing reaches a preset threshold value, automatically starting service life detection operation;

[0023] During the service life detection operation, sampling the voltage and current of the DC screen battery every predetermined time interval;

[0024] According to the sampled voltage and current, calculating a service life value of the DC screen battery;

[0025] ​comparing the life cycle value with a preset early warning threshold, and displaying a life detection result of the battery or giving a battery failure alarm according to the comparison result;

[0026] record the life detection result and detection time.

[0027] Preferably, the calculation of the life cycle value of the DC screen battery according to the sampled voltage and current comprises:

[0028] Start timing from the beginning of entering the life detection budget, in seconds;

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

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

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

[0032] X = (I × S ÷ 3600) ÷ I 限流 × 2 × 100%

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

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

[0035] X = (I × S ÷ 3600) ÷ I 限流 × 2 × 100% + 5%

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

[0037] Preferably, the battery life detection result is displayed or the battery failure alarm is performed according to the comparison result, comprising:

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

[0039] When the life cycle value is less than the early warning threshold, the DC screen battery failure alarm is performed.

[0040] The system and the method thereof have the following beneficial effects:

[0041] The system and the method thereof can monitor the life state of the battery in real time, improve the reliability of the standby power supply of the power system, can find the potential failure risk of the battery in advance by comparing the life cycle value with the early warning threshold, provide the basis for maintenance work, automatically reduce the manual intervention, improve the detection efficiency and accuracy, the detection result and the detection time recorded by the storage module are helpful for the historical analysis and trend prediction of the performance of the battery, and through the effective monitoring of the life of the battery, the stable standby power supply can be ensured at the critical moment, so that the normal operation of the power system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] Figure 1 The structure diagram of a power distribution network DC screen battery life monitoring system in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The detailed description of the drawings is intended to illustrate the current embodiments of the present application, rather than to represent the only form that the present application can be implemented. It should be understood that the same or equivalent functions can be completed by different embodiments intended to be included in the spirit and scope of the present application.

[0045] Referring to Figure 1 An embodiment of the present application provides a power distribution network DC screen battery life monitoring system, comprising:

[0046] The control module 1 is used for setting the frequency of the DC screen battery life detection. When the DC screen battery is converted from the equalizing charging state to the floating charging state and the charging current is 0, the life monitoring countdown is started. Specifically, the control module first sets the frequency of the DC screen battery life detection, that is, determines the periodicity of the system for life detection. When the DC screen battery is converted from the equalizing charging state (a charging mode in which the battery is charged to full capacity) to the floating charging state (a charging mode for maintaining the full state of the battery) and the charging current is 0, the control module starts the life monitoring countdown. This state conversion point is a suitable monitoring starting point because the battery has completed the charging process at this time and can accurately reflect its state. When the countdown reaches the preset threshold, that is, reaches the set detection time point, the control module automatically starts the life detection operation.

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

[0048] The life detection operation module 3 is used for calculating the life cycle value of the DC screen battery according to the sampled voltage and current. Specifically, the life detection operation module calculates the life cycle value of the battery through a specific algorithm using the voltage and current data provided by the data acquisition module. These algorithms include comprehensive analysis of factors such as battery internal resistance, capacity decay, and charge-discharge cycle number. The life cycle value is an index representing the current life state of the battery, which can be a predicted value based on the battery aging model or calculated according to the performance degradation trend of the battery.

[0049] The warning module 4 is used for comparing the life cycle value with the preset warning threshold and displaying the life detection result of the battery or performing battery fault alarm according to the comparison result. Specifically, the warning module compares the calculated life cycle value with the preset warning threshold, which is preset according to the design life of the battery, performance requirements, and safety standards. If the life cycle value is lower than the warning threshold, the warning module will take action according to the comparison result, which includes displaying the life detection result of the battery, reminding the maintenance personnel to pay attention to the health state of the battery, or performing battery fault alarm when potential fault risk is detected.

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

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

[0052] Further, the life detection operation module 3 comprises:

[0053] A timing unit is configured to start timing from the start of entering the life detection budget in seconds. Specifically, the timing unit starts timing when the life detection operation module starts the life detection budget, and the timing unit is seconds. The timing process is to record the time length from the start of detection to the time when the specific condition is reached. The time length is an important parameter for subsequent calculation of the life cycle value of the battery. A first calculation unit is configured to stop timing when the current current sampled by the data acquisition unit is less than 2xI 限流 , and the sampled current voltage is less than 11.7V, and calculate the life cycle value of the DC screen 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 the specific condition is met. The specific condition here is that the current is less than 2 times I limit current (I limit current refers to the current limit value of the battery, which is usually the maximum current that the battery can safely withstand), and the voltage sampled is less than 11.7V. When the 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 approached its discharge end state. The current and voltage in this state can be used to evaluate the performance of the battery. After stopping timing, the first calculation unit will calculate the life cycle value of the battery according to the current timing time recorded by the timing unit and the current current. This calculation involves parameters such as the internal resistance and capacity attenuation of the battery. The time and current data are converted into the life cycle value by a specific algorithm.

[0055] A second calculation unit is configured to stop timing when the current current sampled by the data acquisition unit is greater than or equal to 2xI 限流 , and the sampled current voltage is less than 11.5V, and calculate the life cycle value of the DC screen 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 is met. The condition here is that the current is greater than or equal to 2 times I 限流At the same time, the voltage collected is less than 11.5V, and this set of conditions indicates that the battery is experiencing a more serious discharge process, or the performance of the battery has decreased significantly; 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 the current to calculate the service life 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. For example, a 50Ah 20hr battery, the charge limit is set to 5.0A, and the battery characteristics are selected as 20hr (i.e. 20-hour battery).

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

[0057] Further, the first calculation unit is configured to calculate the service life value of the DC screen battery according to the following formula:

[0058] X = (I x S ÷ 3600) ÷ I 限流 x 2 x 100%

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

[0060] I: the current, i.e. the average current of the battery during discharge, in amperes (A);

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

[0062] 3600: this is a conversion factor for converting time from seconds to hours, because 1 hour is equal to 3600 seconds;

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

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

[0065] I x S ÷ 3600: divide the total discharge capacity by 3600 to convert the time unit from seconds to hours, which gives the actual discharge capacity (ampere-hour, Ah);

[0066] (I x S ÷ 3600) ÷ I

[0067] x 2: Since the system defaults to discharging 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] x 100%: Finally, multiply the obtained ratio by 100% to convert it to a percentage form, so that X is the life cycle value, indicating the actual discharge capacity as a percentage of the maximum capacity of the battery;

[0069] In summary, this formula is used to calculate the life cycle value of the DC screen battery, by comparing the actual discharge capacity with the maximum capacity of the battery (assuming it is equal to the capacity corresponding to the charge limit value), and considering that the battery is only discharged to 50%, to evaluate the health status and remaining life of the battery.

[0070] Further, the second calculation unit is configured to calculate the life cycle value of the DC screen battery according to the following formula:

[0071] X = (I x S ÷ 3600) ÷ I 限流 x 2 x 100% + 5%

[0072] where X is the life cycle value, S is the current timing time in seconds, I is the current in amperes, I 限流 is the set charge 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 I ≥ 2 x I limit.

[0074] Further, the warning module 4 is configured to display the life detection result of the DC screen battery when the life cycle value is greater than or equal to the warning threshold, and to perform the fault alarm of the DC screen battery when the life cycle value is less than the warning threshold.

[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 appropriate measures according to the comparison result; the early warning threshold is a preset value, which represents the critical point of the life cycle value of the battery, and exceeding this point indicates that the performance of the battery has decreased to a level that needs 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 life detection result of the battery, which is realized through a user interface (UI), such as on the monitoring screen of the control room or through the interface of the remote monitoring system, and the displayed information includes the specific value of the life cycle value, the state of the battery and the required maintenance recommendations.

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

[0077] Through such an early warning mechanism, the embodiment of the present application can monitor the state of the battery in real time and timely notify the maintenance personnel when the performance of the battery decreases to a certain extent, so as to take appropriate measures to ensure the stable operation of the power system. This early warning system helps to prevent power system interruption caused by battery failure, and improves the reliability and safety of the power system.

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

[0079] Step S10, according to the set DC panel battery life detection frequency, when the DC panel battery is converted from the equalizing charging state to the floating charging state and the charging current is 0, enter the life monitoring countdown, and when the countdown reaches the preset threshold, automatically start the life detection operation;

[0080] Step S20, during the life detection operation, sample the voltage and current of the DC panel battery every predetermined time interval;

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

[0082] Step S40, compare the life cycle value with the preset early warning threshold, and display the life detection result of the battery or perform battery fault alarm according to the comparison result;

[0083] Step S50, record the life detection result and detection time.

[0084] Further, the step S30 comprises:

[0085] Counting from the start of entering the life detection budget, in seconds;

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

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

[0088] Further, when the current current sampled by the data acquisition unit is less than 2×I 限流 , and the collected current voltage is less than 11.7V, the calculation method of calculating the life cycle value of the DC screen battery according to the current timing time and the current current is as follows:

[0089] X=(I×S÷3600)÷I 限流 ×2×100%

[0090] Wherein, X is the life cycle value, S is the current timing time, unit is second, I is the current, unit is ampere, I 限流 is the set charging current limit value, unit is ampere.

[0091] Further, when the current current sampled by the data acquisition unit is greater than or equal to 2×I 限流 , and the collected current voltage is less than 11.5V, the calculation method of calculating the life cycle value of the DC screen battery according to the current timing time and the current current is as follows:

[0092] X=(I×S÷3600)÷I 限流 ×2×100%+5%

[0093] Wherein, X is the life cycle value, S is the current timing time, unit is second, I is the current, unit is ampere, I 限流 is the set charging current limit value, unit is ampere.

[0094] Further, the step S40 comprises:

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

[0096] When the life cycle value is less than the early warning threshold, the DC screen storage battery fault alarm is performed.

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

[0098] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A power distribution network DC panel battery life monitoring system, characterized by, include: The control module is used to set the frequency of the DC panel battery life detection. 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 the 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 is 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 based on the comparison result; Storage module, used to record life test results and test time; The life detection calculation module includes: Timing unit, used to count the time from the beginning of entering the life detection budget, in seconds; A first calculation unit is configured to stop timing when the current current sampled by the data acquisition module is less than 2xI 限流 , and the sampled current voltage is less than 11.7V, and calculate the service life value of the DC screen battery according to the current timing time and the current current. A second calculation unit is configured to stop timing when the current current sampled by the data acquisition module is greater than or equal to 2×I 限流 , and the sampled current voltage is less than 11.5V, and calculate the service life value of the DC screen battery according to the current timing time and the current current.

2. The system of claim 1, wherein, The first calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula: X = (I x S ÷ 3600) ÷ I 限流 x 2 x 100% Wherein, X is the life cycle value, S is the current timing time, the unit is second, I is the current, the unit is ampere, I 限流 is the set charging current limit value, the unit is ampere.

3. The system of claim 1, wherein, The second calculation unit is used to calculate the life cycle value of the DC panel battery according to the following formula: X = (I x S ÷ 3600) ÷ I 限流 x 2 x 100% + 5% wherein X is a lifetime value, S is a current time, I is a current, I 限流 is a set charge current limit value.

4. The system of claim 1, wherein, 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 DC panel battery fault alarm.

5. A method for monitoring the life of a battery in a DC panel of a power distribution network, characterized by, 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. 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; Calculating the life cycle value of the DC panel battery based on the sampled voltage and current; Comparing the life cycle value with a preset warning threshold, and displaying the battery life test result or issuing a battery failure alarm based on the comparison result; Record life test results and test time; The calculating of 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 sample is less than 2xI 限流 , and the collected current voltage is less than 11.7V, stop timing, and calculate the life cycle value of the DC screen battery according to the current timing time and the current. When the current of the sample is greater than or equal to 2xI 限流 , and the collected current voltage is less than 11.5V, stop timing, and calculate the life cycle value of the DC screen battery according to the current timing time and the current.

6. The method of claim 5, wherein, When the current sample is less than 2xI 限流 , and the collected current voltage is less than 11.7V, the calculation method of the life cycle value of the DC screen battery according to the current timing time and the current is as follows: X = (I x S ÷ 3600) ÷ I 限流 x 2 x 100% Wherein, X is the life cycle value, S is the current timing time, the unit is second, I is the current, the unit is ampere, I 限流 is the set charging current limit value, the unit is ampere.

7. The method of claim 5, wherein, When the current sample is greater than or equal to 2xI 限流 , and the collected current voltage is less than 11.5V, the calculation of the life cycle value of the DC screen battery according to the current timing time and the current is shown in the following formula: X = (I x S ÷ 3600) ÷ I 限流 x 2 x 100% + 5% Wherein, X is the life cycle value, S is the current timing time, the unit is second, I is the current, the unit is ampere, I 限流 is the set charging current limit value, the unit is ampere.

8. The method of claim 5, wherein, 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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