A charging and discharging management method applied to a parallel communication power supply system

Abstract

The application provides a charging and discharging management method applied to a parallel communication power supply system, comprising the following steps: acquiring bus electrical parameter information and state information of a storage battery branch by performing multi-dimensional state sensing on the parallel communication power supply system; determining whether AC power input is normal according to the bus electrical parameter information to obtain an analysis result, and determining a charging and discharging management target mode according to the analysis result; determining a DC / DC converter control instruction based on the charging and discharging management target mode and the state information of the storage battery branch; and distributing the control instruction to the corresponding DC / DC converter, so that the DC / DC converter executes the charging and discharging management target mode according to the control instruction. The application performs charging and discharging management in combination with the state information of the storage battery branch, so that charging or discharging is allocated as needed, overloading of healthy batteries is avoided, premature attenuation of the healthy batteries is avoided, thermal runaway of aged batteries due to overcurrent is prevented, and the service life of the parallel communication power supply system is prolonged.

Description

Technical Field

[0001] This invention relates to the field of charge and discharge management technology, and in particular to a charge and discharge management method for parallel communication power supply systems. Background Technology

[0002] With the rapid development of communication infrastructure such as 5G, edge computing, and data centers, higher demands are being placed on the capacity, reliability, and maintainability of backup power systems. Parallel-connected communication power systems have become the mainstream architecture due to their ease of capacity expansion and N+X redundancy backup. Each battery branch is connected in parallel to the DC bus via an independent DC / DC converter. During normal operation, the DC bus voltage is stepped down by the DC / DC converter to charge each battery unit; when the AC input is abnormal, the battery unit is stepped up by the DC / DC converter for discharge management.

[0003] Currently, constant voltage current limiting or fixed droop control strategies are commonly used in charging and discharging management. However, in practical applications, when batteries from different manufacturers and of varying ages are mixed in parallel communication power systems, uniform voltage control can lead to overcharging or over-discharging of battery packs with low internal resistance. Long-term operation can result in severe bias current phenomena and even cause battery pack overheating and runaway, significantly shortening the overall lifespan of the parallel communication power system. Moreover, existing technologies typically regulate the circulating current between modules by adjusting the droop coefficient. Increasing the droop coefficient to suppress the circulating current between modules can cause the bus voltage to fluctuate drastically with the load, affecting the normal operation of sensitive communication equipment. Conversely, decreasing the droop coefficient makes it difficult to effectively suppress ineffective circulating current between modules, increasing system losses. This leads to a contradiction between energy efficiency and dynamic response in parallel communication power systems. Therefore, a new charging and discharging management method is urgently needed to at least address some of the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a charging and discharging management method for parallel communication power supply systems. By combining the state information of battery branches for charging and discharging management, differentiated current distribution is performed according to the health and state of charge of each battery branch during charging or discharging. This avoids premature degradation of healthy batteries due to overload and prevents thermal runaway of aging batteries due to overcurrent, thereby extending the lifespan of the parallel communication power supply system.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a charging and discharging management method for a parallel communication power supply system, comprising: Multi-dimensional state perception is performed on parallel communication power systems to acquire bus electrical parameter information and battery branch status information; Based on the analysis of bus electrical parameters, determine whether the AC input is normal, obtain the analysis and judgment results, and determine the charging and discharging management target mode based on the analysis and judgment results; The DC / DC converter control commands are determined based on the charge / discharge management target mode and the state information of the battery branches. Control commands are distributed to the corresponding DC / DC converters, enabling the DC / DC converters to execute the target charging and discharging management mode according to the control commands.

[0006] Furthermore, the bus electrical parameter information includes: bus voltage and load current. By analyzing and judging whether the bus voltage and load current are within the normal range, it is determined whether the AC input is normal, and the analysis and judgment result is obtained. When the analysis and judgment result is that the AC input is normal, the charging and discharging management target mode is charging mode; otherwise, the charging and discharging management target mode is discharging mode.

[0007] Furthermore, based on the charge / discharge management target mode and the state information of the battery branches, the DC / DC converter control commands are determined, including: The state of charge and health of the battery branch are determined based on the state information of the battery branch. Dynamic current sharing weight analysis and determination are performed based on the state of charge and health status of the battery branches to obtain the dynamic current sharing weight coefficient of the battery branches. The control target of the battery branch is determined by combining the dynamic current sharing weight coefficient of the battery branch under the charge and discharge management target mode; Based on the control objective of the battery branch and the identification information of the corresponding DC / DC converter, the control command of the DC / DC converter is determined.

[0008] Furthermore, when the DC / DC converter executes the charge and discharge management target mode according to the control command, it combines the control target of the battery branch with the state information of the battery branch and adjusts the input or output through the virtual impedance control algorithm so that the branch current distribution ratio of the battery branch matches the dynamic current sharing weight coefficient.

[0009] Furthermore, when the target charging and discharging management mode is charging mode, a health status threshold is determined based on the status information of the battery branch, and the upper limit of charging of the battery branch is limited based on the health status threshold analysis result.

[0010] Furthermore, when adjusting the input or output of the battery branch by combining the control target of the battery branch with the state information of the battery branch through the virtual impedance control algorithm, the control mode is also adjusted by combining the load current micro-component of the battery branch.

[0011] Furthermore, the health status of the battery branch is determined by analyzing the voltage and current information of the batteries in the battery branch during charging mode.

[0012] Furthermore, after the control mode of the battery branch is adjusted to constant voltage mode and the voltage stabilizes, the health status of the battery branch is updated based on the status information of the battery in the battery branch under constant voltage mode.

[0013] Furthermore, after obtaining the dynamic current sharing weight coefficient of the battery branch, the fault determination and protection of the battery branch are also carried out based on the dynamic current sharing weight coefficient of the battery branch.

[0014] Furthermore, during the process of the DC / DC converter executing the charge / discharge management target mode according to the control command, the charge / discharge management target mode, the voltage and current of the battery branch, and fault alarm information are sent to the display module for cyclic display.

[0015] The present invention has achieved the following beneficial effects: This invention achieves multi-dimensional state perception for parallel communication power systems, moving away from relying on a single, fixed droop coefficient for charge and discharge management. By combining bus electrical parameters and battery status, it charges or discharges on demand according to the actual conditions of the bus and battery branches in the parallel communication power system, precisely controlling the output of each DC / DC converter. This prevents healthy batteries from prematurely degrading due to overload and also prevents aging batteries from thermal runaway due to overcurrent, extending the lifespan of the parallel communication power system. Furthermore, it can quickly adjust in case of AC power abnormalities or load fluctuations, ensuring smooth and stable bus voltage and guaranteeing the normal operation of sensitive communication equipment.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the application.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram illustrating the steps of the charge / discharge management method described in this invention; Figure 2 This is a schematic diagram of step three in the charge / discharge management method of the present invention; Figure 3 This is an example diagram showing the control process in the charge and discharge management method of the present invention. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] like Figure 1 As shown, this embodiment of the invention provides a charging and discharging management method for a parallel communication power supply system, comprising: Step 1: Perform multi-dimensional state perception on the parallel communication power system to obtain bus electrical parameter information and battery branch state information.

[0021] In this step, multi-dimensional state perception refers to the collection of multi-indicator information for the bus and battery branches in the parallel communication power supply system. Bus electrical parameters include bus voltage and load current, while battery branch state information includes branch current, terminal voltage, state of charge (SOC), and health status. Specifically, SOC refers to the ratio of the battery's current remaining capacity to its current maximum available capacity, with a value in the range [0,1]. Health status refers to the ratio of the battery's current maximum available capacity to its rated capacity, also within the range [0,1], and is used to characterize the degree of battery aging.

[0022] Step 2: Analyze and determine whether the AC input is normal based on the bus electrical parameter information, obtain the analysis and judgment results, and determine the charging and discharging management target mode based on the analysis and judgment results.

[0023] In this step, when analyzing and determining whether the AC input is normal based on the bus electrical parameters, the analysis checks whether the bus voltage and load current are within the normal range. If both the bus voltage and load current are within the normal range, the AC input is normal, and the analysis result is "AC input is normal." If the bus voltage and / or load current are outside the normal range, the AC input is abnormal, and the analysis result is "AC input is abnormal." Here, the normal range is typically within the allowable error range, for example: ±5% of the system rated voltage and ±5% of the load rated current.

[0024] The target charging and discharging management modes include charging mode and discharging mode. When determining the target charging and discharging management mode based on the analysis and judgment results, if the analysis and judgment results indicate that the AC power input is normal, the target charging and discharging management mode is charging mode; if the analysis and judgment results indicate that the AC power input is abnormal, the target charging and discharging management mode is discharging mode.

[0025] Step 3: Determine the DC / DC converter control commands based on the charge / discharge management target mode and the status information of the battery branches.

[0026] In this step, there is a one-to-one correspondence between the DC / DC converter and the battery branch. Each battery branch contains one DC / DC converter, and the battery is connected in parallel to the bus through the DC / DC converter. The DC / DC converter is bidirectional; it can charge the battery through a load input to achieve charging mode, and it can also discharge the battery by outputting a load from the battery to achieve discharging mode.

[0027] Step 4: Distribute control commands to the corresponding DC / DC converters so that the DC / DC converters execute the charge / discharge management target mode according to the control commands.

[0028] In this step, when the target charging / discharging management mode is charging mode, the DC / DC converter performs charging regulation according to the control command after receiving the control command. When the target charging / discharging management mode is discharging mode, the DC / DC converter performs discharging regulation according to the control command after receiving the control command.

[0029] In the above technical solution, while the DC / DC converter executes the charge and discharge management target mode according to the control command, it continues to perform multi-dimensional state perception on the parallel communication power system and on the battery branch. After the DC / DC converter executes the charge and discharge management target mode according to the control command, it feeds back the bus electrical parameter information and the battery branch status information obtained from the multi-dimensional state perception of the parallel communication power system to step two to form closed-loop control.

[0030] The aforementioned technical solution, through multi-dimensional state perception of the parallel communication power supply system, no longer relies on a single, fixed droop coefficient for charge and discharge management. It combines bus electrical parameters and battery status to charge or discharge as needed according to the actual conditions of the bus and battery branches in the parallel communication power supply system. This precisely controls the output of each DC / DC converter, preventing healthy batteries from prematurely degrading due to overload and preventing aging batteries from thermal runaway due to overcurrent, thus extending the lifespan of the parallel communication power supply system. Simultaneously, it can quickly adjust in case of AC power abnormalities or load fluctuations, ensuring smooth and stable bus voltage and guaranteeing the normal operation of sensitive communication equipment. Furthermore, when determining control commands, it no longer relies on a single, fixed droop coefficient. By combining bus electrical parameters and battery status, it dynamically determines the target charging and discharging management mode and distributes control commands. This not only allows for rapid adjustment in case of AC power abnormalities or load fluctuations, ensuring smooth and stable bus voltage and guaranteeing the normal operation of sensitive communication equipment, but also, under steady-state operation, effectively suppresses ineffective circulating currents between modules by precisely controlling the output of each DC / DC converter, reducing system losses and achieving a balance between high energy efficiency and high dynamic response. By performing multi-dimensional state sensing on the bus in a parallel communication power supply system, it is possible to directly analyze and determine whether the AC input is normal based on the bus electrical parameter information. It can autonomously identify the power grid environment and automatically switch the target charging and discharging management mode, achieving automated control in charging and discharging management, reducing manual intervention costs, and ensuring that the parallel communication power supply system operates with optimal control logic under various complex operating conditions, thus enhancing the emergency response capability of the parallel communication power supply system. By performing multi-dimensional state sensing on each battery branch in the parallel system, it is possible to obtain real-time state information of batteries from different manufacturers and with varying ages and conditions. Based on the actual state of each battery branch, it is possible to accurately determine the control commands of the DC / DC converter, achieving on-demand allocation of charging and discharging current. This avoids overcharging and over-discharging problems of low-internal-resistance battery packs caused by uniform voltage control, fundamentally eliminating bias current phenomena, preventing battery pack overheating and runaway, and improving the overall lifespan of the parallel communication power supply system in scenarios involving mixed heterogeneous batteries. Furthermore, by monitoring the dual-dimensional information of bus voltage and load current in real time, a more accurate AC power status judgment logic is constructed. This allows for a more sensitive identification of insufficient energy supply caused by AC power instability, sudden drops in grid quality, or power outages, by directly starting from the bus voltage fluctuations and load demand dynamics on the output side. This ensures the real-time nature of the analysis and judgment results and provides a more confident decision-making basis for subsequent switching of charging and discharging modes.

[0031] In one embodiment provided by the present invention, such as Figure 2 As shown, the DC / DC converter control commands are determined based on the charge / discharge management target mode and the state information of the battery branch, including: S1. Determine the state of charge and health of the battery branch based on the state information of the battery branch.

[0032] In this step, the status information of the battery branch includes: branch current, terminal voltage, state of charge (SOC), and health status of the battery pack. When determining the SOC and health status of the battery branch based on its status information, the SOC and health status information of the battery branch are identified and extracted from the SOC status information.

[0033] S2. Based on the state of charge and health of the battery branches, perform dynamic current sharing weight analysis and determination to obtain the dynamic current sharing weight coefficient of the battery branches.

[0034] In this step, a higher health status data value for the battery branch indicates a healthier battery within that branch, and a larger corresponding dynamic current sharing weight coefficient. Conversely, a lower health status data value indicates an older battery within that branch, and a smaller corresponding dynamic current sharing weight coefficient. When performing dynamic current sharing weight analysis and determination based on the battery branch's state of charge and health status, the dynamic current sharing weight coefficient is calculated using the following formula: ; In the above formula, Indicates the first Dynamic current sharing weighting coefficient for each battery branch; Indicates the first State of charge data for each battery branch; Indicates the first Health status data of each battery branch; Indicates the first State of charge data for each battery branch; Indicates the first Health status data of each battery branch; This indicates the total number of battery branches; As the number one impact factor, It is the second most influential factor. ,and , usually by default , It can also be dynamically adjusted according to the operation and maintenance strategy.

[0035] When the state of charge or health status data of a battery branch is 0, the weight of this item is 0, and this item is not included in the denominator.

[0036] S3. Under the charge and discharge management target mode, determine the control target of the battery branch by combining the dynamic current sharing weight coefficient of the battery branch.

[0037] In this step, a larger dynamic current sharing weighting coefficient results in a smaller virtual impedance and a smaller voltage drop, requiring the battery branch to handle more current. Conversely, a smaller dynamic current sharing weighting coefficient results in a larger virtual impedance and a larger voltage drop. The virtual impedance of this battery branch automatically increases, thereby limiting its current and preventing overload. The control target refers to either the target voltage value or the target current value. When determining the control target of a battery branch in the charge / discharge management target mode, the virtual impedance of the battery branch is determined based on the dynamic current sharing weighting coefficient, the adjustment gain constant, and the base impedance. Then, the target voltage of the battery branch is determined based on its virtual impedance, thus obtaining the control target of the battery branch.

[0038] S4. Determine the DC / DC converter control command based on the control target of the battery branch and the identification information of the corresponding DC / DC converter.

[0039] In this step, when determining the DC / DC converter control command based on the control objective of the battery branch and the identification information of the corresponding DC / DC converter, the DC / DC converter control command is determined according to the charge / discharge management target mode. When the charge / discharge management target mode is charging mode, the identification information of the DC / DC converter is obtained, and then the DC / DC converter control command is generated based on the control command in charging mode, combined with the control objective and the identification information. Here, the control command in charging mode is usually a voltage adjustment command, which finely adjusts the voltage of each DC / DC converter so that the bus voltage is slightly tilted towards the battery pack with higher SOH within the allowable voltage difference range, thereby guiding the current using the line voltage drop difference. When the charge / discharge management target mode is discharging mode, the identification information of the DC / DC converter is obtained, and then the DC / DC converter control command is generated based on the control command in discharging mode, combined with the control objective and the identification information. Here, the control command in discharging mode usually controls the on / off logic of the corresponding DC / DC converter.

[0040] The above technical solution achieves differentiated analysis of battery branches, which not only improves battery utilization efficiency but also actively protects aging batteries, slows down the aging process, and extends battery life. By dynamically analyzing and determining the current sharing weights based on the state of charge and health of the battery branches, a multi-objective fusion of power balance and lifespan balance is achieved. Furthermore, the introduction of first and second influencing factors allows for flexible adjustment of control strategies according to different operation and maintenance stages, improving the precision and intelligence of charge and discharge management and ensuring the lifespan of parallel communication power supply systems.

[0041] In one embodiment of the present invention, when the DC / DC converter executes the charge and discharge management target mode according to the control command, the control target of the battery branch is combined with the state information of the battery branch and the input or output is adjusted through the virtual impedance control algorithm so that the branch current distribution ratio of the battery branch matches the dynamic current sharing weight coefficient.

[0042] In the above technical solution, when the control target of the battery branch is combined with the state information of the battery branch to adjust the input or output through the virtual impedance control algorithm, the virtual impedance value is introduced into the voltage control loop. By correcting the voltage reference value, the input / output characteristics of the DC / DC converter or the on / off characteristics of the battery branch are adjusted so that the actual current shunting ratio of each battery branch matches the dynamic current sharing weight coefficient.

[0043] Furthermore, when the target charging and discharging management mode is charging mode, a health status threshold is determined based on the status information of the battery branch, and the upper limit of charging of the battery branch is limited based on the health status threshold analysis result.

[0044] In the above technical solution, the health status threshold is an aging threshold preset based on the age of the battery. When limiting the charging upper limit of the battery branch based on the analysis and judgment results of the health status threshold, if the health status data value of the battery branch is lower than the health status threshold, the duty cycle of the DC / DC converter on that battery branch is adjusted to actively limit the upper limit of the charging current of that branch, so that it does not exceed the maximum allowable charging rate of the aging battery branch, effectively controlling the temperature rise and preventing serious safety accidents such as thermal runaway, bulging, or even fire caused by overheating.

[0045] Furthermore, when adjusting the input or output of the battery branch by combining the control target of the battery branch with the state information of the battery branch through the virtual impedance control algorithm, the control mode is also adjusted by combining the load current micro-component of the battery branch.

[0046] The above technical solution addresses the slow voltage dynamic response caused by virtual impedance by adjusting the control mode based on the minute component of the battery branch's load current. Specifically, it involves: determining the minute component of the battery branch's load current based on the branch's status information; analyzing whether this component exceeds a preset threshold; and when it does, forcibly setting the virtual impedance of the battery branch to 0 or a minimum value for a preset time, while simultaneously sending a forced switching command from droop mode to constant voltage mode. Utilizing the high bandwidth of constant voltage mode, the bus voltage is rapidly increased to prevent power loss in communication equipment. Once the voltage stabilizes, virtual impedance control is slowly restored, returning to current sharing mode.

[0047] In one embodiment of the present invention, the health status of the battery branch is determined by analyzing the voltage and current information of the battery in the battery branch during charging mode.

[0048] In the above technical solution, when the voltage and current information of the battery in the battery branch are analyzed and determined in the charging mode, the constant current range of the battery in the charging stage is obtained based on the state information of the battery branch obtained by multi-dimensional state perception, the ratio of the voltage increment of the battery branch to the charged amount is calculated, and then the DC internal resistance of the battery branch is calculated in combination with the current temperature coefficient. The battery state data (SOH value) is obtained by inversion based on the internal resistance growth rate.

[0049] In the above technical solution, when there is no charging condition for a long time, the voltage rebound curve in the discharge mode is used for estimation.

[0050] Furthermore, after the control mode of the battery branch is adjusted to constant voltage mode and the voltage stabilizes, the health status of the battery branch is updated based on the status information of the battery in the battery branch under constant voltage mode.

[0051] In the above technical solution, the state information of the battery branch during the voltage recovery phase is acquired each time the battery branch enters constant voltage mode. Based on this state information, the current response time constant of the battery branch is determined. Then, based on this current response time constant, the system analyzes whether the battery branch's health status needs updating. When the current response time constant of the battery branch is greater than the initial calibration value, the battery branch's aging is accelerated, and its health status needs to be updated. At this time, the battery state data (SOH value) is updated according to the health status update rules, resulting in new battery state data (SOH value) for the next cycle's analysis and calculation. This avoids the risk of insufficient charging or thermal runaway caused by abnormal current decay characteristics of aging batteries during the constant voltage phase. When the current response time constant of the battery branch is not greater than the initial calibration value, there is no need to update the battery branch's health status. SOH updates are only triggered when the current response time constant of the battery branch is greater than the initial calibration value, avoiding frequent and meaningless calculations. Simultaneously, it can sensitively capture the inflection point of battery aging, ensuring that the system can reflect the battery's true lifespan status in a timely manner. Here, the voltage recovery phase refers to the voltage stabilization range before the bus voltage returns to steady state after the constant voltage mode ends and the battery switches to float charging or standby mode. The initial calibration value is usually the current response time constant measured by a new battery at 25°C.

[0052] The aforementioned technical solution calculates the ratio of voltage increment to charged capacity within the constant current range during the charging phase and incorporates the current temperature coefficient for correction. This eliminates the interference of temperature and SOC (State of Charge) changes on voltage, making the calculated internal resistance closer to the battery's true physical state. Consequently, the derived SOH value becomes more valuable, improving the accuracy and reliability of the battery status. Furthermore, calculations based on the constant current phase avoid voltage surges at the beginning and end of charging, ensuring the stability and comparability of data sampling. When updating the health status of battery branches, the system analyzes the branch's status information during the voltage recovery phase after each branch enters constant voltage mode, achieving dynamic adaptive updates based on aging characteristics. Moreover, the current response time constant of the battery branch provides a deep understanding of the decay and polarization of internal chemical active materials, intuitively reflecting the battery's internal condition and facilitating health status updates.

[0053] In one embodiment of the present invention, after obtaining the dynamic current sharing weight coefficient of the battery branch, the fault determination and protection of the battery branch are also performed based on the dynamic current sharing weight coefficient of the battery branch.

[0054] In the above technical solution, when determining and protecting the battery branch based on its dynamic current sharing weight coefficient, the dynamic current sharing weight coefficient is analyzed and judged in conjunction with a minimum threshold. When the dynamic current sharing weight coefficient of a battery branch is less than the minimum threshold, the battery branch is considered to have a fault, and range protection is activated for that branch, simultaneously triggering a fault warning. Here, the minimum threshold is a range protection threshold determined based on the statistical distribution of the dynamic current sharing weight coefficients of each battery branch during normal system operation. It is typically set to 50% of the average dynamic current sharing weight coefficient or a fixed value set based on engineering experience. Range protection refers to controlling the corresponding switching device of the branch to disconnect or limiting its charging current to below 0.05C, performing only trickle protection.

[0055] The aforementioned technical solution, by determining and protecting battery branch faults based on the dynamic current sharing weight coefficient of the battery branch, can promptly detect anomalies before they escalate, improving the sensitivity of anomaly identification. Furthermore, by triggering fault warnings, it can alert maintenance personnel to intervene and prevent sudden downtime, shifting from passive maintenance to proactive prevention. Physical isolation of the battery is achieved by controlling the disconnection of the corresponding switching device in the affected branch, preventing short-circuit current from impacting the bus or thermal runaway from spreading the fault, ensuring the safe operation of other normal branches and the entire system. By limiting the charging current to below 0.05C and performing only trickle charging, further damage to the battery branch due to high-current charging is avoided, while allowing for slow capacity recovery or float charging, providing possibilities for subsequent maintenance or automatic recovery and maximizing availability.

[0056] In one embodiment of the present invention, during the process of the DC / DC converter executing the charge and discharge management target mode according to the control command, the charge and discharge management target mode, the voltage, current and fault alarm information of the battery branch are sent to the display module for cyclic display.

[0057] In the above technical solution, the electrical parameters of the cyclic charging process when the charge / discharge management target mode is charging mode are different from the electrical parameters of the cyclic discharging process when the charge / discharge management target mode is discharging mode. For example... Figure 3 As shown, when the target charging / discharging management mode is charging mode, the B: charging display section displays real-time data changes, cycling through battery voltage, battery charging current, module address, battery nominal capacity, and fault alarms. In a specific example, the initial display is b12.7, indicating a battery voltage of 12.7V under the current charging state; c0.0 indicates a current charging current of 0.0A, where c indicates the charging scenario; Ad00 indicates a communication address of 0; C200 indicates a battery rated capacity of 200Ah; E102 indicates a high-voltage side overvoltage fault (code E102). After the fault is displayed, the display returns to the initial b12.7, completing one cycle of the charging scenario display. When the target charging / discharging management mode is discharging mode, the A: discharging display section displays real-time data changes, cycling through module output voltage, module output current, module address, battery discharging current, battery nominal capacity, and fault alarms. In its specific example, the initial display is 47.9, indicating that the module output voltage is 47.9V ​​under the current discharge state; o0.00 indicates that the module output current is 0.00A under the current discharge state; Ad00 indicates that the communication address of the current device is 0; d1.1 indicates that the current battery discharge current is 1.1A, where d indicates the discharge scenario; C200 indicates that the rated capacity of the battery is 200Ah; E102 indicates that the current module has triggered a high-voltage side overvoltage fault (code E102). After the fault is displayed, it returns to the initial 47.9, completing one cycle of the discharge scenario display.

[0058] The above technical solution visualizes the effect of charge and discharge management through a cyclic display, enabling operators or monitoring systems to more intuitively understand the current working status of the DC / DC converter, the progress of target mode switching, and changes in control parameters. This helps to enhance the transparency of the system, facilitates the timely detection of abnormalities or deviations, and thus ensures the safe and stable operation of the system.

[0059] Those skilled in the art should understand that the terms "first" and "second" in this invention merely refer to different application stages.

[0060] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0061] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A charging and discharging management method for a parallel communication power supply system, characterized in that, The charge / discharge management method includes: Multi-dimensional state perception is performed on parallel communication power systems to acquire bus electrical parameter information and battery branch status information; Based on the analysis of bus electrical parameters, determine whether the AC input is normal, obtain the analysis and judgment results, and determine the charging and discharging management target mode based on the analysis and judgment results; The DC / DC converter control commands are determined based on the charge / discharge management target mode and the state information of the battery branches. Control commands are distributed to the corresponding DC / DC converters, enabling the DC / DC converters to execute the target charging and discharging management mode according to the control commands.

2. The charge / discharge management method according to claim 1, characterized in that, The bus electrical parameter information includes: bus voltage and load current. By analyzing and judging whether the bus voltage and load current are within the normal range, it is determined whether the AC input is normal, and the analysis and judgment result is obtained. When the analysis and judgment result is that the AC input is normal, the charging and discharging management target mode is charging mode; otherwise, the charging and discharging management target mode is discharging mode.

3. The charge / discharge management method according to claim 1, characterized in that, Based on the charge / discharge management target mode and the state information of the battery branch, the DC / DC converter control commands are determined, including: The state of charge and health of the battery branch are determined based on the state information of the battery branch. Dynamic current sharing weight analysis and determination are performed based on the state of charge and health status of the battery branches to obtain the dynamic current sharing weight coefficient of the battery branches. The control target of the battery branch is determined by combining the dynamic current sharing weight coefficient of the battery branch under the charge and discharge management target mode; Based on the control objective of the battery branch and the identification information of the corresponding DC / DC converter, the control command of the DC / DC converter is determined.

4. The charge / discharge management method according to claim 3, characterized in that, When the DC / DC converter executes the charge and discharge management target mode according to the control command, it combines the control target of the battery branch with the state information of the battery branch and adjusts the input or output through the virtual impedance control algorithm so that the branch current distribution ratio of the battery branch matches the dynamic current sharing weight coefficient.

5. The charge / discharge management method according to any one of claims 1-4, characterized in that, When the target mode for charge and discharge management is charging mode, a health status threshold is determined based on the status information of the battery branch, and the upper limit of charging of the battery branch is limited based on the health status threshold analysis result.

6. The charge / discharge management method according to claim 4, characterized in that, When adjusting the input or output of the battery branch by combining the control target of the battery branch with the state information of the battery branch through the virtual impedance control algorithm, the control mode is also adjusted by combining the load current micro-component of the battery branch.

7. The charge / discharge management method according to claim 3, characterized in that, The health status of the battery branch is determined by analyzing the voltage and current information of the batteries in the battery branch during charging mode.

8. The charge / discharge management method according to claim 7, characterized in that, After the control mode of the battery branch is adjusted to constant voltage mode and the voltage stabilizes, the health status of the battery branch is updated according to the status information of the battery in the battery branch under constant voltage mode.

9. The charge / discharge management method according to claim 3, characterized in that, After obtaining the dynamic current sharing weight coefficient of the battery branch, the fault determination and protection of the battery branch are also carried out based on the dynamic current sharing weight coefficient of the battery branch.

10. The charge / discharge management method according to claim 1, characterized in that, During the process of the DC / DC converter executing the charge and discharge management target mode according to the control command, the charge and discharge management target mode, the voltage and current of the battery branch and the fault alarm information are sent to the display module for cyclic display.

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