Intelligent activation detection method for storage battery pack of direct-current power supply for station

Abstract

The invention discloses an intelligent activation detection method for a direct-current power supply storage battery pack for a station. The method comprises the following steps: configuring an intelligent activation detection program for the storage battery pack in a direct-current monitoring device; and after the intelligent activation detection program of the storage battery pack is started, the direct current monitoring device controls the output voltage of the charging module to be lower than the terminal voltage of the storage battery pack, so that the storage battery pack starts to discharge by utilizing a bus load. In the discharging process of the storage battery pack, the direct current monitoring device records discharging data of the storage battery pack, judges whether the storage battery pack meets the condition of stopping discharging or not, and controls the storage battery pack to stop discharging after judging that the storage battery pack meets the condition of stopping discharging. The DC monitoring device obtains the health state of the storage battery pack according to the discharge data of the storage battery pack. According to the intelligent activation detection method for the storage battery pack of the direct-current power supply for the station, the purposes of state judgment and activation of the storage battery pack are achieved on the premise of not changing the wiring of the original direct-current power supply for the station.

Description

Technical Field

[0001] This invention relates to the field of intelligent activation detection of battery packs, and more particularly to an intelligent activation detection method for station DC power supply battery packs. Background Technology

[0002] As a crucial component of substation DC power supplies, battery banks are the "last line of defense" and "lifeline" for the safe and stable operation of the entire substation. Their health directly impacts the inherent safety level of the power grid. Currently, during normal DC system operation, the measured voltage of the battery bank is the charging voltage, not the battery bank voltage, making it impossible to determine if the battery is open-circuited. If the battery is open-circuited, a DC bus voltage loss will occur directly during an AC system fault, causing significant losses. Currently, determining whether the battery bank is open-circuited is mainly done during maintenance discharge of the battery bank; however, battery bank maintenance suffers from long cycles, low efficiency, and high risks. Summary of the Invention

[0003] This invention provides an intelligent activation detection method for station DC power supply battery packs, which can achieve the purpose of battery pack status judgment and activation without changing the original wiring of the station DC power supply.

[0004] This invention provides an intelligent activation detection method for a station DC power supply battery pack. The method is applied to a station DC power supply, which includes a charging module and a battery pack. The charging module charges the battery pack, and the station DC power supply is equipped with a DC monitoring device to monitor the power supply. The method includes the following steps: configuring an intelligent activation detection program for the battery pack in the DC monitoring device; after starting the intelligent activation detection program, the DC monitoring device controls the output voltage of the charging module to be lower than the terminal voltage of the battery pack, causing the battery pack to begin discharging using the bus load; during the discharge process, the DC monitoring device records the discharge data of the battery pack and determines whether the battery pack has reached the conditions for stopping discharge, and after determining that the conditions for stopping discharge have been met, controls the battery pack to stop discharging; and the health status of the battery pack is obtained based on the discharge data.

[0005] In some embodiments, during the discharge process of the battery pack, a DC monitoring device controls the battery pack to discharge at a preset constant current.

[0006] In some embodiments, the station DC power supply has a discharge device for discharging the battery pack. The DC monitoring device controls the battery pack to discharge at a preset constant current, including: when it detects that the discharge current of the battery pack has not reached the preset constant current, the DC monitoring device controls the discharge current of the discharge device and the current of the bus load to be equal to the preset constant current.

[0007] In some embodiments, after the battery pack stops discharging, the DC monitoring device controls the output voltage of the charging module to reach the float charge voltage of the battery pack, then determines whether the battery pack has met the conditions for starting equalization charging, and after determining that the battery pack has met the conditions for starting equalization charging, controls the battery pack to start equalization charging.

[0008] In some embodiments, obtaining the health status of the battery pack based on the discharge data of the battery pack includes: the DC monitoring device comparing and analyzing the discharge data of the battery pack with the discharge data of a new battery pack under the same conditions as the battery pack, and then obtaining the health status of the battery pack based on the results of the comparison and analysis.

[0009] In some embodiments, the discharge data includes the voltage of individual battery cells in the battery pack, the temperature of the terminals in the battery pack, and the voltage of the battery pack.

[0010] In some embodiments, obtaining the health status of the battery pack based on the discharge data of the battery pack includes: the DC monitoring device assigning values ​​to each discharge data point, calculating the health level of the battery pack based on the assigned discharge data points, and then obtaining the health status of the battery pack based on the health level of the battery pack.

[0011] In some embodiments, the DC monitoring device initiates a smart activation detection program for the battery pack after the set cycle has been completed.

[0012] In some embodiments, after the intelligent activation detection program for the battery pack is initiated, the DC monitoring device begins self-checking for any interlocking conditions. If no interlocking condition is detected, it determines whether the station DC power supply has any alarms. If no alarms are detected in the station DC power supply, the output voltage of the charging module is controlled to be lower than the terminal voltage of the battery pack.

[0013] In some embodiments, the DC monitoring device periodically records the discharge data of the battery pack.

[0014] According to an embodiment of the present invention, an intelligent activation detection method for station DC power supply battery packs is provided. Through intelligent activation detection program control and with the assistance of a DC monitoring device, a safe and automated "virtual discharge detection environment" is constructed by reversely utilizing the charging module and existing bus load. Without power outages or wiring modifications, the method actively simulates real discharge tests on the battery pack. By analyzing key data during the discharge process, it intelligently diagnoses the battery pack's internal health status, ultimately achieving the goal of timely detection of potential hazards and ensuring grid safety. This method achieves battery pack status assessment and activation without altering the original station DC power supply wiring, avoiding the risk of open circuits in the battery pack, detecting lagging batteries, and providing timely warnings and alarms, thus ensuring the safe and stable operation of the station DC power supply. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the station DC power supply battery pack in an embodiment of the present invention;

[0017] Figure 2 This is a flowchart illustrating the intelligent activation detection method for station DC power supply battery packs in an embodiment of the present invention.

[0018] In the diagram, 1-DC monitoring device, 2-charging module, 3-discharging device, 4-battery pack monitoring device, 5-AC power switching device, 6-busbar, 7-first switch, 8-second switch, 9-third switch, 10-fourth switch. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] In current technology, battery packs undergo periodic capacity testing, typically every year, or every two years for newly commissioned systems. This long interval makes it difficult to detect open circuits or individual battery abnormalities in a timely manner. Furthermore, current battery capacity testing relies heavily on manual labor, which is inefficient, and manual wiring carries inherent risks. Recent substation accidents, where protection equipment malfunctioned, were caused by the battery, acting as a backup power source, failing to supply power due to an open circuit during AC power failures. In addition, while advanced battery monitoring devices can monitor individual cell voltage, internal resistance, terminal temperature, and connector resistance, providing comprehensive data, they still cannot accurately and promptly identify battery abnormalities.

[0021] For the above issues, please refer to Figure 1-2 The present invention provides an intelligent activation detection method for station DC power supply battery packs, which is applied to station DC power supplies.

[0022] The station's DC power supply (also known as the DC system) includes a battery bank, a charging module 2, a discharging device 3, an AC power switching device 5, and a battery bank monitoring device 4. The charging module 2 is used to charge the battery bank. The discharging device 3 is used to discharge the battery bank. The AC power switching device 5 is used for switching AC power. The battery bank monitoring device 4 is used for monitoring the battery bank. The station's DC power supply is equipped with a DC monitoring device 1 to monitor the DC power supply.

[0023] Under the above conditions, the intelligent activation detection method for station DC power supply battery packs includes the following steps:

[0024] Step 1: Configure the intelligent activation detection program for the battery pack in the DC monitoring device 1. After starting the intelligent activation detection program, the DC monitoring device 1 controls the output voltage of the charging module 2 to be lower than the terminal voltage of the battery pack, causing the battery pack to begin discharging using the load of bus 6. During the discharge process of the battery pack, the DC monitoring device 1 records the discharge data of the battery pack and determines in real time whether the battery pack has reached the conditions for stopping discharge. After determining that the battery pack has reached the conditions for stopping discharge, the DC monitoring device 1 controls the battery pack to stop discharging.

[0025] In the above steps, see Figure 1 By controlling the first switch 7 between the charging module 1 and the bus 6 to be turned on, the second switch 8 between the charging module 1 and the battery pack is kept on, and the third switch 9 between the battery pack and the bus 6 is kept off, so that the battery pack and the charging module 1 jointly supply power to the load of the bus 6; by controlling the output current of the charging module 1, the battery pack maintains a constant current output, so that the battery pack can discharge using the bus load.

[0026] In the above steps, the DC monitoring device 1 starts the intelligent activation detection program for the battery pack after the set cycle has been reached. The above settings realize the function of periodic automatic start-up.

[0027] In the above steps, after the intelligent activation detection program for the battery pack is started, the DC monitoring device 1 begins to self-check for any interlocking conditions, which is essentially a functional test. If no interlocking conditions are detected, it checks if the station DC power supply has any alarms, such as audible or visual alarms. If no alarms are detected in the station DC power supply, the output voltage of the charging module 2 is controlled to be lower than the terminal voltage of the battery pack. The terminal voltage of the battery pack refers to the total voltage between the positive and negative terminals of the battery pack. If an alarm is detected in the station DC power supply, the intelligent activation detection program for the battery pack is terminated, and no further operations are performed.

[0028] In the above steps, the DC monitoring device 1 controls the output voltage of the charging module 2 to be lower than the terminal voltage of the battery pack, including: the DC monitoring device 1 sends an output voltage command to the charging module 2 and sends a voltage value, wherein the sent voltage value is lower than the terminal voltage value of the battery pack. The sent voltage value can be set, and the default value is 5V lower than the float charging voltage.

[0029] In the above steps, the DC monitoring device 1 can periodically record the discharge data of the battery pack, or it can record the discharge data of the battery pack in real time. The discharge data includes the voltage of the individual battery cells in the battery pack, the temperature of the terminals in the battery pack, the voltage of the battery pack, the discharge start time, and the discharge duration. Among them, the voltage includes the discharge start voltage and the discharge cutoff voltage.

[0030] In the above steps, during the discharge process of the battery pack, the DC monitoring device 1 controls the battery pack to discharge at a preset constant current. This setup simulates actual verification testing.

[0031] In the above steps, the DC monitoring device 1 controls the battery pack to discharge at a preset constant current, including: when the discharge current of the battery pack is detected to be less than the preset constant current, the DC monitoring device 1 controls the discharge current of the discharge device 3 and the current of the bus load to be added together to equal the preset constant current. When the discharge power is insufficient to reach the preset constant current, the discharge device 3 is activated, and a current limiting value is issued simultaneously to control the fourth switch 10 between the battery pack and the discharge device 3 to be turned on, thereby controlling the charging module 2 so that the battery pack outputs current to the bus 6 and the discharge device 3 outputs current to meet the preset constant current requirement.

[0032] In the above steps, the conditions for stopping the discharge include: reaching the termination voltage of the battery pack (also known as the termination voltage of the entire battery pack), reaching the termination voltage of a single battery cell in the battery pack (also known as the termination voltage of a single battery cell), reaching the set termination discharge capacity of the battery pack (also known as the battery termination discharge capacity), and reaching the set termination discharge time of the battery pack (also known as the battery termination discharge duration).

[0033] In the above steps, after the DC monitoring device 1 stops discharging the battery pack, it controls the output voltage of the charging module 2 to reach the float charge voltage of the battery pack, then determines whether the battery pack has met the conditions for starting equalization charging, and after determining that the battery pack has met the conditions for starting equalization charging, it controls the battery pack to start equalization charging, so that the station DC power supply returns to its original state.

[0034] In the above steps, controlling the output voltage of the charging module 2 to reach the float charge voltage of the battery pack includes: the DC monitoring device 1 sends a voltage value to the charging module 2 according to the float charge voltage value of the battery pack.

[0035] In the above steps, during the discharge process of the battery pack, the DC monitoring device 1 determines whether any abnormalities occur, such as abnormal battery pack discharge voltage, abnormal individual battery cell voltage, or alarms in the station's DC power supply. Upon determining an abnormality, it issues an audible and visual alarm, uploads the abnormal data to the backend, and controls the battery pack to stop discharging. Then, it controls the output voltage of the charging module 2 to reach the float charge voltage of the battery pack. Next, it determines whether the battery pack meets the conditions for starting equalization charging. Once the conditions are met, it controls the battery pack to begin equalization charging, restoring the station's DC power supply to its original state. This setup improves the operational reliability of the DC system.

[0036] Step 2: Obtain the health status of the battery pack based on its discharge data.

[0037] In the above steps, obtaining the health status of the battery pack based on its discharge data includes: the DC monitoring device 1 compares and analyzes the discharge data of the existing battery pack with the discharge data of a new battery pack under the same conditions, and then obtains the health status of the battery pack based on the results of the comparison and analysis. Alternatively, it includes: the DC monitoring device 1 assigns values ​​to each discharge data point, calculates the health level of the battery pack based on the assigned values, and then obtains the health status of the battery pack based on the health level. The DC monitoring device 1 assigns values ​​to each discharge data point according to different weights. The health level of the battery pack calculated using the above settings can be used to predict the health trend of the battery pack, so as to take timely measures to ensure the health of the battery pack. After obtaining the health status of the battery pack based on its discharge data, the intelligent activation detection program for the battery pack is terminated.

[0038] Specifically, the intelligent activation detection method for station DC power supply battery packs includes the following steps:

[0039] (1) After the DC monitoring device 1 reaches the set cycle, it starts the intelligent activation detection program of the battery pack and then executes step (2).

[0040] (2) DC monitoring device 1 starts self-checking for whether there is a lockout condition. If no lockout condition is detected, step (3) is executed; if a lockout condition is detected, the intelligent activation detection program of the battery pack is terminated and no further operation is performed.

[0041] (3) Determine if there is an alarm in the station DC power supply. If there is no alarm in the station DC power supply, proceed to step (4). If there is an alarm in the station DC power supply, terminate the intelligent activation detection program of the battery pack and do not perform any subsequent operations.

[0042] (4) Control the output voltage of the charging module 2 to be lower than the terminal voltage of the battery pack, so that the battery pack can start discharging using the load of the bus 6. During the discharge process of the battery pack, the DC monitoring device 1 records the discharge data of the battery pack and judges in real time whether the battery pack has reached the condition to stop discharging. After judging that the battery pack has reached the condition to stop discharging, step (5) is executed.

[0043] (5) The DC monitoring device 1 controls the battery pack to stop discharging, and then executes step (6).

[0044] (6) Control the output voltage of the charging module 2 to reach the float charging voltage of the battery pack, then determine whether the battery pack has reached the conditions for starting equalization charging, and after determining that the battery pack has reached the conditions for starting equalization charging, execute step (7).

[0045] (7) Control the battery pack to start equalization charging, so that the station DC power supply is restored to its original state, and then execute step (8).

[0046] (8) The DC monitoring device 1 obtains the health status of the battery pack based on the discharge data of the battery pack, and the intelligent activation detection program of the battery pack stops.

[0047] In summary, the intelligent activation detection method for station DC power supply battery packs of the present invention, controlled by an intelligent activation detection program for the battery pack and with the assistance of a DC monitoring device, reversely utilizes the charging module and existing bus load to construct a safe and automated "virtual discharge detection environment." Without power outages or wiring modifications, it actively simulates real discharge tests on the battery pack and intelligently diagnoses its internal health status by analyzing key data during the discharge process. Ultimately, it aims to promptly identify potential hazards and ensure grid safety. Thus, without altering the original wiring of the station DC power supply, it achieves the purpose of battery pack status judgment and activation, thereby avoiding the risk of open circuits in the battery pack, identifying lagging batteries, providing timely warnings and alarms, and ensuring the safe and stable operation of the station DC power supply.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for intelligent activation detection of a station DC power supply battery pack, the method being applied to a station DC power supply, the station DC power supply comprising a charging module and a battery pack, the charging module being used to charge the battery pack, and the station DC power supply being equipped with a DC monitoring device to monitor the station DC power supply; characterized in that, The method includes the following steps: The DC monitoring device is equipped with an intelligent activation detection program for the battery pack. After the intelligent activation detection program of the battery pack is started, the DC monitoring device controls the output voltage of the charging module to be lower than the terminal voltage of the battery pack, so that the battery pack starts to discharge using the bus load; during the discharge process of the battery pack, the DC monitoring device records the discharge data of the battery pack and determines whether the battery pack has reached the condition for stopping discharge, and after determining that the battery pack has reached the condition for stopping discharge, controls the battery pack to stop discharging. The health status of the battery pack is obtained based on the discharge data of the battery pack.

2. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, During the discharge process of the battery pack, the DC monitoring device controls the battery pack to discharge at a preset constant current.

3. The intelligent activation detection method for station DC power supply battery packs as described in claim 2, characterized in that, The station DC power supply has a discharge device, which is used to discharge the battery pack. The DC monitoring device controls the battery pack to discharge at a preset constant current, including: When the discharge current of the battery pack is detected to be less than the preset constant current, the DC monitoring device controls the discharge current of the discharge device and the current of the bus load to be added together to equal the preset constant current.

4. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, After the battery pack stops discharging, the DC monitoring device controls the output voltage of the charging module to reach the float charge voltage of the battery pack, then determines whether the battery pack has met the conditions for starting equalization charging, and after determining that the battery pack has met the conditions for starting equalization charging, controls the battery pack to start equalization charging.

5. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, The health status of the battery pack is obtained based on its discharge data, including: The DC monitoring device compares and analyzes the discharge data of the battery pack with the discharge data of a new battery pack under the same conditions, and then obtains the health status of the battery pack based on the results of the comparison and analysis.

6. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, The discharge data includes the voltage of individual battery cells in the battery pack, the temperature of the terminals in the battery pack, and the voltage of the battery pack.

7. The intelligent activation detection method for station DC power supply battery packs as described in claim 6, characterized in that, The health status of the battery pack is obtained based on its discharge data, including: The DC monitoring device assigns values ​​to each of the discharge data points, calculates the health level of the battery pack based on the assigned values, and then obtains the health status of the battery pack based on the health level.

8. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, The DC monitoring device initiates the intelligent activation detection program for the battery pack after the set cycle has been completed.

9. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, After the intelligent activation detection program of the battery pack is started, the DC monitoring device begins to self-check whether there is a lockout condition; after detecting that there is no lockout condition, it determines whether the station DC power supply has an alarm; after determining that the station DC power supply has no alarm, it controls the output voltage of the charging module to be lower than the terminal voltage of the battery pack.

10. The intelligent activation detection method for station DC power supply battery packs as described in claim 1, characterized in that, The DC monitoring device periodically records the discharge data of the battery pack.

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