Energy distribution method and device based on direct current power supply system, equipment and medium

Abstract

The application provides an energy distribution method, device, equipment and medium based on a direct-current power supply system, which comprises the following steps: acquiring current power supply information of a power supply module and a power supply direct-current bus; a control module confirms the working mode of a battery module according to the current power supply information; the battery module is charged in a normal working mode; the control module monitors the bus load state, and the battery module supports the bus voltage when an impact load or the power supply module is monitored to quit; the battery module automatically exits after the disturbance disappears; in a capacity verification working mode, the battery module performs online capacity verification, is discharged to a first threshold value, is charged to a second threshold value, and the bus power supply is jointly maintained by the power supply module and the part of the battery that does not participate in discharging when the capacity verification is discharged, and the bus power supply is not interrupted. By adopting the grouping rotation capacity verification and the differentiated investment strategy, the bus power supply is zero interrupted in the capacity verification process, the impact load and the power supply module are quickly responded, and the power supply reliability and the operation and maintenance safety of the direct-current power supply system are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of DC system technology for substations, and particularly to an energy distribution method, device, equipment, and medium based on a DC power supply system. Background Technology

[0002] DC power supply systems are widely used in critical locations such as substations to provide uninterrupted DC power to protection, control, and communication equipment. In these systems, batteries serve as backup power, maintaining bus power supply in the event of AC power failure or power module malfunction. Their health directly affects system reliability. To assess battery capacity, periodic capacity discharge tests are necessary.

[0003] In existing technologies, substation capacity assessment methods are mainly divided into offline capacity assessment and online capacity assessment. Offline capacity assessment requires disconnecting the battery module from the DC bus and discharging it under an external load. During this period, the battery cannot provide backup support, and if AC power fails or the power supply module malfunctions, the bus will immediately lose power. Although online capacity assessment does not require disconnection from the bus, in traditional online capacity assessment methods, the battery still serves as part of the bus power supply during discharge. If the depth of discharge is too large, it will still be unable to meet load demands during power failure; if the depth of discharge is insufficient, the capacity assessment result will be inaccurate. More importantly, regardless of the method, the battery cannot simultaneously serve as a reliable backup power source during capacity assessment, leading to a risk of interruption of DC bus power supply. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an energy distribution method, device, electronic equipment, and storage medium based on a DC power supply system, which can achieve uninterrupted DC bus power supply during online capacity verification, thereby improving the power supply reliability of the substation DC power supply system; at the same time, through the coordinated control of dual battery packs, the backup battery pack can be automatically and quickly put into operation to support the bus voltage when impact loads arrive or the power supply module is out of service, and automatically withdraw after the fault disappears, thus realizing intelligent energy distribution.

[0005] In a first aspect, embodiments of the present invention provide an energy distribution method based on a DC power supply system, applied to a DC power supply system. The DC power supply system includes a DC power supply bus, a DC feeder module, a battery module, a power supply module, a charging / discharging module, and a control module. The DC power supply bus, the power supply module, and the battery module are all connected to the DC feeder module. The charging / discharging module is connected to both the battery module and the DC power supply bus. The control module is connected to the DC power supply bus, the DC feeder module, the battery module, the charging / discharging module, and the power supply module. The energy distribution method based on the DC power supply system includes: Obtain the current power supply information of the power supply module and the power supply DC bus; The control module determines the operating mode of the battery module based on the current power supply information, wherein the operating mode includes at least a normal operating mode and a capacity-controlled operating mode; When the battery module is in the normal working mode, the charging and discharging module charges the battery module, and the control module monitors the load status of the power supply DC bus in real time. When the control module detects an impact load, or when the power supply module is out of operation, the battery module is automatically put into operation to support the voltage of the DC power supply bus. When the impact load disappears or the power supply module is put into operation, the battery module is automatically put out of operation, and the DC power supply module continues to distribute power to the DC load. When the battery module operates in the capacity-controlled mode, it performs online capacity control. The control module controls the battery module to discharge to a first threshold and controls the charging and discharging module to charge the battery module until it is charged to a second threshold. The first threshold is less than the second threshold. When the battery module is discharging under capacity control, the power supply DC bus is maintained uninterrupted by the power supply module and the non-discharging portion of the battery module.

[0006] In some embodiments of the present invention, the battery module includes a standard capacity battery pack and a backup capacity battery pack, and the automatic connection of the battery module to support the voltage of the power supply DC bus includes: When the control module detects the impact load, the control module controls the backup capacity battery pack to be connected to the DC power supply bus to support the bus voltage for a short time. The control module monitors the duration of the impact load and the discharge status of the backup capacity battery pack in real time. If the impact load disappears within a preset time, the connection between the backup capacity battery pack and the power supply DC bus is disconnected. If the duration of the impact load exceeds the preset time, or if the remaining capacity of the backup battery pack is lower than the preset lower threshold, the standard capacity battery pack is controlled to be connected to the power supply DC bus and the backup capacity battery pack to jointly support the voltage of the power supply DC bus. When the control module detects that the power supply module has stopped running, the control module determines the exit type of the power supply module, wherein the exit type includes planned exit and fault exit; When the exit type is the planned exit, the control module controls the standard capacity battery pack to be put into operation first, and then controls the backup capacity battery pack to be put into operation later, so as to smoothly transition the voltage of the power supply DC bus. When the exit type is the fault exit, the control module controls the standard capacity battery pack and the backup capacity battery pack to be put into operation simultaneously to provide uninterrupted power supply to the power supply DC bus. The control module dynamically adjusts the output ratio of the standard capacity battery pack and the backup capacity battery pack according to the load demand of the power supply DC bus until the power supply module resumes operation.

[0007] In some embodiments of the present invention, the DC power supply system further includes a switching module, which includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch. One end of the first switch and the second switch are both connected to the power supply DC bus, and the other end of the first switch and the second switch are both connected to the DC feed module. One end of the third switch and the fourth switch are both connected to the standard capacity battery pack, and the other end of the third switch and the fourth switch are both connected to the power supply DC bus. One end of the fifth switch and the sixth switch are both connected to the backup capacity battery pack, and the other end of the fifth switch and the sixth switch are both connected to the power supply DC bus. The control module controls the standard capacity battery pack to be engaged first, and then controls the backup capacity battery pack to be engaged later, including: When the DC power supply module is operating normally, the first switch is closed and the second switch is opened, so that the DC power supply module is connected to the power supply DC bus through the first switch; When the DC power supply module is modified or repaired, the second switch is closed and the first switch is opened so that the DC power supply module is connected to the standard capacity battery pack or the backup capacity battery pack through the power supply DC bus via the second switch. After the DC power supply module is modified or repaired, the first switch is closed and the second switch is opened so that the DC power supply module is put into operation. When the standard capacity battery pack is put into operation, the third switch and the fourth switch are closed to connect the standard capacity battery pack to the power supply DC bus. When the backup battery pack is put into operation, close the fifth switch and the sixth switch to connect the backup battery pack to the power supply DC bus. When the standard capacity battery pack and the backup capacity battery pack are put into operation at the same time, the third switch, the fourth switch, the fifth switch and the sixth switch are closed sequentially or simultaneously according to the order in which the switch modules are put into operation. When exiting the standard capacity battery pack, disconnect the third and fourth switches; when exiting the backup capacity battery pack, disconnect the fifth and sixth switches.

[0008] In some embodiments of the present invention, when the impact load disappears or the power supply module is put into operation, the battery module is automatically deactivated, and the DC power supply module continues to distribute power to the DC load, including: The control module monitors in real time whether the impact load has disappeared or whether the power supply module has resumed operation. When the battery module meets the exit conditions, the control module confirms the type of battery pack currently in operation. When the battery pack type is a backup capacity battery pack, the fifth switch and the sixth switch are disconnected to exit the backup capacity battery pack, and the power supply module supplies power to the power supply DC bus alone. When both the standard capacity battery pack and the backup capacity battery pack are in operation, the third switch and the fourth switch are first disconnected to exit the standard capacity battery pack, and then the fifth switch and the sixth switch are disconnected to exit the backup capacity battery pack. During the exit process of the standard capacity battery pack and the backup capacity battery pack, the first switch is kept closed so that the DC power supply module can continuously distribute power to the DC load. After the standard capacity battery pack and the backup capacity battery pack have finished discharging, the control module controls the charging and discharging module to resume charging the battery module.

[0009] In some embodiments of the present invention, the battery module performs online capacity verification, including: When the power supply module is operating stably and the current load value of the power supply DC bus is lower than the preset load value, the battery module is allowed to enter the full capacity working mode. The standard capacity battery pack and the backup capacity battery pack in the battery module are controlled to discharge alternately or simultaneously to a first threshold, where the first threshold is 50% of the rated capacity; During the discharge process, the control module monitors the voltage of the power supply DC bus in real time; if the voltage drops to the preset lower limit, the full capacity discharge is immediately suspended, and the power supply module and the battery packs that are not participating in the discharge supply the power supply DC bus. When the discharge reaches the first threshold, the charging and discharging module is controlled to charge the discharged battery pack until its capacity is restored to the second threshold, which is 75% of the rated capacity. During the capacity expansion process, the DC power supply module normally distributes electrical energy to the DC load.

[0010] In some embodiments of the present invention, the method further includes, after the battery module is charged to a second threshold: When an abnormality is detected in the power supply module or the voltage of the power supply DC bus drops below a preset safety threshold during the core discharge process, the control module immediately stops the core discharge process of the battery module and controls the charging and discharging module to switch to supplementary charging mode, so that the power supply module and the charging and discharging module jointly maintain the voltage stability of the power supply DC bus. Once the power supply module returns to normal and the voltage of the DC power supply bus rises back to the rated range, the control module resumes the core capacity discharge process of the battery module and continues to complete the remaining core capacity discharge and charging operations.

[0011] In some embodiments of the present invention, after the control module confirms the operating mode of the battery module based on the current power supply information, the method further includes: Obtain the current power supply information of the power supply module, wherein the current power supply information includes at least the output voltage and output current of the power supply module, the voltage fluctuation range of the power supply DC bus, and the state of charge of the battery module; When the output voltage and output current of the power supply module are within the rated range, and the state of charge of the battery module is higher than the preset high threshold, the control module confirms that the battery module enters the core capacity working mode. If the output voltage or current of the power supply module is abnormal, or if the state of charge of the battery module is lower than a preset low threshold, the battery module is confirmed to enter the normal working mode to ensure the power supply of the DC bus and the charging of the battery module.

[0012] In a second aspect, embodiments of the present invention provide an energy distribution device for a DC power supply system, including at least one control processor and a memory for communicatively connecting to the at least one control processor; the memory stores instructions executable by the at least one control processor, the instructions being executed by the at least one control processor to enable the at least one control processor to perform the energy distribution method for the DC power supply system as described in the first aspect above.

[0013] Thirdly, embodiments of the present invention provide an electronic device including an energy distribution device for a DC power supply system as described in the second aspect above.

[0014] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for performing the energy distribution method of the DC power supply system as described in the first aspect above.

[0015] The energy distribution method of the DC power supply system according to embodiments of the present invention has at least the following beneficial effects: This invention divides the battery module into a standard capacity battery pack and a backup capacity battery pack. In the full capacity operation mode, only one battery pack is discharged for testing, while the other remains in hot standby mode. During discharge, the DC power supply bus is maintained at a stable voltage by the power supply module and the battery pack not participating in the discharge. Even if the power supply module malfunctions or the bus voltage drops, the system can immediately pause the full capacity test and switch to a supplementary charging mode, resuming testing only after the system recovers.

[0016] When a surge load occurs on the DC power supply bus, the backup capacity battery bank is prioritized for short-term support. If the backup capacity is insufficient or the time limit is exceeded, the standard capacity battery bank is then activated. During planned shutdowns, the standard capacity battery bank is activated first, followed by the backup capacity battery bank, to ensure a smooth transition and reduce circulating current. During fault-related shutdowns, both battery banks are activated simultaneously for rapid response and uninterrupted power supply. This refined control strategy ensures power supply continuity under extreme conditions while avoiding unnecessary over-activation of the battery banks, thus extending the overall battery life. Attached Figure Description

[0017] Figure 1 This is a schematic block diagram of the DC power supply system provided in an embodiment of the present invention; Figure 2 This is a circuit schematic diagram of the DC power supply module provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of the battery module, power supply module, and charging / discharging module provided in an embodiment of the present invention; Figure 4 This is a flowchart of an energy distribution method based on a DC power supply system provided in an embodiment of the present invention; Figure 5 This is a flowchart of an embodiment of the present invention for automatically engaging a battery module to support the voltage of the DC power supply bus; Figure 6 This is a flowchart provided by an embodiment of the present invention, which first controls the standard capacity battery pack to be put into operation, and then controls the backup capacity battery pack to be put into operation. Figure 7 This is a flowchart provided in an embodiment of the present invention, showing how the DC power supply module is connected to the DC power supply bus via the first switch after the first switch is closed and the second switch is opened. Figure 8 This is a flowchart of the battery module performing online capacity verification provided in an embodiment of the present invention; Figure 9 This is a flowchart provided by an embodiment of the present invention until the battery module is charged to the second threshold; Figure 10 This is a flowchart illustrating how the control module determines the operating mode of the battery module based on the current power supply information, as provided in this embodiment of the invention. Figure 11This is a structural diagram of the energy distribution device of a DC power supply system provided in another embodiment of the present invention. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1 and Figure 3This invention provides a DC power supply system, which includes a DC power supply bus, a DC feeder module, a battery module, a power supply module, a charging / discharging module, and a control module. The DC power supply bus, the power supply module, and the battery module are all connected to the DC feeder module. The charging / discharging module is connected to both the battery module and the DC power supply bus. The control module is connected to the DC power supply bus, the DC feeder module, the battery module, the charging / discharging module, and the power supply module. The battery module includes a standard capacity battery pack and a backup capacity battery pack. The DC power supply system also includes a switch module, which includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch. One end of the first and second switches is connected to the DC power supply bus, and the other end of both the first and second switches is connected to the DC feeder module. One end of the third and fourth switches is connected to the standard capacity battery pack, and the other end of both the third and fourth switches is connected to the DC power supply bus. One end of the fifth and sixth switches is connected to the backup capacity battery pack, and the other end of both the fifth and sixth switches is connected to the DC power supply bus.

[0023] It should be noted that the power supply DC bus serves as the core energy collection and distribution node of the system, through which all electrical energy is transmitted. The DC feeder module is directly connected to the power supply DC bus and is responsible for distributing electrical energy to various protection, control, and monitoring DC loads within the substation. The battery module adopts a parallel structure, consisting of a standard capacity battery pack and a backup capacity battery pack. The standard capacity battery pack specifically handles the substation's routine basic loads, meeting continuous and stable power demand; the backup capacity battery pack is used to handle short-term impact loads such as circuit breaker operation and high-power equipment startup, and serves as a redundant backup for the entire system, seamlessly taking over when the standard capacity battery pack is under maintenance or malfunctions, ensuring uninterrupted power supply. The charging and discharging module is connected to both the power supply DC bus and the battery module, while the power supply module is connected to the power supply DC bus, forming a controllable path with the battery module through the charging and discharging module. The control module is connected to the power supply DC bus, DC feeder module, battery module, charging and discharging module and power supply module respectively. It is used to monitor the voltage and current parameters of each part in the power supply DC bus and the status of the battery module in real time. Based on the monitoring results, it accurately controls the operation of each connected switching element in the charging and discharging module to realize intelligent management of the battery module and dynamic adjustment of the system operation status.

[0024] Furthermore, when the system is operating normally, the first and second switches are closed, directly supplying power from the DC bus to the DC feeder module to power the downstream DC loads. Simultaneously, according to the battery management strategy, when the third and fourth switches are closed, the standard capacity battery pack is connected to the DC bus for float charging or is in hot standby mode; the fifth and sixth switches are used to connect the backup capacity battery pack, which can also be connected to the DC bus for charging or standby. When the power supply module is under maintenance or malfunctions, if the standard capacity battery pack has sufficient charge, its switch remains closed, and the standard capacity battery pack supplies power to the bus via the third and fourth switches, and then to the feeder module via the first and second switches; when the standard capacity battery pack is depleted, malfunctions, or undergoes online capacity testing, the third and fourth switches are disconnected, and the fifth and sixth switches are closed, activating the backup capacity battery pack to supply power to the DC bus, thereby achieving uninterrupted power supply to the DC bus and effective energy distribution.

[0025] The control method of the present invention will be further described below with reference to the accompanying drawings.

[0026] Reference Figure 4 , Figure 4 A flowchart of an energy distribution method based on a DC power supply system provided in this embodiment of the invention, the energy distribution method based on a DC power supply system includes, but is not limited to, the following steps: Step S11: Obtain the current power supply information of the power supply module and the DC power supply bus; It should be noted that the current power supply information of the DC power supply bus includes at least the output voltage and output current of the power supply module, the voltage fluctuation range of the DC power supply bus, and the state of charge of the battery module.

[0027] Step S12: The control module confirms the working mode of the battery module based on the current power supply information. The working mode includes at least the normal working mode and the capacity-controlled working mode. It should be noted that when the output voltage and current of the power supply module are both within the rated range, and the voltage fluctuation of the power supply DC bus is less than a preset threshold (e.g., ±5% of the rated voltage), while the state of charge of the battery module is higher than a preset high threshold (e.g., 100%), the system is deemed to meet the conditions for performing a capacity test. In this case, the control module confirms that the battery module enters the capacity test mode. Conversely, if the output voltage or current of the power supply module is abnormal (e.g., voltage below 90% of the rated value, or current sudden change exceeding 20% ​​of the rated value), or the state of charge of the battery module is lower than a preset low threshold (e.g., 20%), the system prioritizes ensuring the power supply reliability of the power supply DC bus and the charging recovery of the battery module. In this case, the control module confirms that the battery module enters the normal operating mode. This mode distinction allows the system to achieve a balance between power supply safety and battery health management.

[0028] Step S13: When the battery module is in normal working mode, the charging and discharging module charges the battery module, and the control module monitors the load status of the power supply DC bus in real time. It should be noted that in normal operating mode, the battery module serves as a backup power source and needs to maintain sufficient charge. Therefore, the control module controls the charging and discharging module to charge the battery module using a constant current and constant voltage charging strategy until the battery module's state of charge reaches a preset float charging threshold (e.g., 95%).

[0029] Meanwhile, the control module monitors the load status of the DC power supply bus in real time, including the magnitude and rate of change of the load current and whether there are any impact fluctuations, in order to confirm whether the DC power supply system has experienced any abnormal events such as impact loads or power supply module shutdown.

[0030] Step S14: When the control module detects an impact load, or when the power supply module is out of operation, the battery module is automatically put into operation to support the voltage of the DC power supply bus. When the impact load disappears or the power supply module is put into operation, the battery module is automatically put out of operation, and the DC power supply module continues to distribute power to the DC load. It should be noted that, under normal operating mode, if the control module detects an inrush load on the DC power supply bus (e.g., the load current rises to more than three times the rated value within milliseconds), or detects that the power supply module has shut down due to planned maintenance, fault, or other reasons, it immediately initiates the automatic battery module switching procedure. Because the battery module has a fast response speed and can instantly release large currents, it can serve as a temporary support source for the DC power supply bus, preventing voltage drops from causing power loss to DC loads (such as protection and control equipment). Once the inrush load disappears or the power supply module resumes operation, the control module automatically executes the battery module shutdown procedure. When the battery module disconnects from the DC power supply bus, if only the backup battery bank is engaged, its connection is directly disconnected; if both battery banks are engaged, the standard capacity battery bank is shut down first, followed by the backup capacity battery bank. During the shutdown process, the DC power supply module remains connected to the bus to ensure uninterrupted power distribution to the DC load. After shutdown, the control module resumes charging the battery module via the charging / discharging module.

[0031] Step S15: When the battery module is in the capacity-controlled working mode, the battery module performs online capacity control. The control module controls the battery module to discharge to the first threshold and controls the charging and discharging module to charge the battery module until the battery module is charged to the second threshold. The first threshold is less than the second threshold. When the battery module is discharging under capacity control, the power supply DC bus is maintained by the power supply module and the non-discharging part of the battery module to ensure uninterrupted power supply.

[0032] It should be noted that in the core capacity operating mode, the control module first instructs the battery module to discharge until its voltage or capacity drops to a preset first threshold (the first threshold is the termination voltage of core capacity discharge, which is lower than the normal operating float charge voltage). After the discharge is completed, the control module immediately switches states and controls the charging and discharging module to charge the battery module until it recovers to a second threshold (i.e., a fully charged state or float charge voltage, which is higher than the first threshold). Throughout the core capacity discharge process, in order to ensure the stability of the power supply DC bus voltage and the uninterrupted power supply to the load, the power supply DC bus is maintained jointly by the power supply module and the remaining parts of the battery module that are not involved in the discharge.

[0033] Additionally, in one embodiment, reference is made to Figure 5 ,exist Figure 4 Step S14 of the illustrated embodiment also includes, but is not limited to, the following steps: Step S21: When the control module detects an impact load, the control module controls the backup capacity battery pack to be connected to the DC power supply bus to support the bus voltage for a short time. Step S22: The control module monitors the duration of the impact load and the discharge status of the backup capacity battery pack in real time. If the impact load disappears within a preset time, the backup capacity battery pack is disconnected from the power supply DC bus. Step S23: If the duration of the impact load exceeds the preset time, or if the remaining capacity of the backup battery pack is lower than the preset lower threshold, control the standard capacity battery pack to be connected to the power supply DC bus and the backup capacity battery pack to jointly support the voltage of the power supply DC bus. Step S24: When the control module detects that the power supply module has stopped running, the control module determines the exit type of the power supply module, where the exit type includes planned exit and fault exit. Step S25: When the exit type is planned exit, the control module controls the standard capacity battery pack to be put into operation first, and then controls the backup capacity battery pack to be put into operation later, so as to smoothly transition the voltage of the power supply DC bus. Step S26: When the exit type is fault exit, the control module controls the standard capacity battery pack and the backup capacity battery pack to be put into operation simultaneously to provide uninterrupted power supply to the DC power supply bus. In step S27, the control module dynamically adjusts the output ratio of the standard capacity battery pack and the backup capacity battery pack according to the load demand of the power supply DC bus until the power supply module resumes operation.

[0034] It should be noted that when the control module detects a voltage drop in the bus due to an impact load, it first activates the backup battery pack. In the control strategy of this embodiment, the backup battery pack is defined as a short-time high-frequency response group, which normally maintains a high state of charge and is in hot standby mode, allowing frequent short-term high-current discharges to quickly clamp the voltage of the power supply DC bus. If the impact load disappears within a preset time, the backup battery pack is immediately disconnected and restored to standby mode to avoid unnecessary energy cycling caused by the simultaneous activation of the standard capacity battery pack and the backup capacity battery pack. If the impact on the power supply DC bus lasts for too long or the remaining capacity of the backup pack is too low, the standard capacity battery pack is activated.

[0035] It should be noted that in this embodiment, the standard capacity battery pack and the backup capacity battery pack are made of the same material. The purpose of putting in the standard capacity battery pack is not to make up for the insufficient rate capability, but to increase the total capacity and total current capability of the parallel batteries, prevent the backup pack from being damaged due to deep discharge, and at the same time share the load to extend the total backup support time.

[0036] Furthermore, the control module adopts a sequence of "first engaging the standard capacity battery pack, then engaging the backup capacity battery pack." The principle is that the planned shutdown process is known and the voltage change is relatively gradual. Engaging the standard capacity battery pack first allows for a smooth load transfer on the bus, and the backup capacity battery pack is engaged only after the bus current stabilizes. Since the electrical parameters of the two battery packs are identical, this sequential engagement method reduces the circulating current impact at the moment of grid connection and avoids excessive inrush current caused by slight voltage differences when both battery packs are connected simultaneously, thus achieving a smooth voltage transition. Step S26 addresses fault-based shutdown (such as a sudden power outage): In this case, the bus voltage drops rapidly, leaving no time for sequential operations. Therefore, the control module commands both battery packs to engage simultaneously, using maximum parallel current capacity to instantly support the bus, achieving true uninterrupted power supply.

[0037] During the period when both battery banks are supplying power, the control module dynamically adjusts the output ratio of the standard capacity battery bank and the backup capacity battery bank according to the real-time load demand of the DC bus. Since the two battery banks are identical, the adjustment ratio can be based on their respective remaining capacity, health status, or temperature. The aim is to keep the depth of discharge of the two battery banks consistent, preventing one bank from being depleted prematurely while the other still has a large amount of remaining capacity, thereby maximizing the total available energy of the parallel system. At the same time, dynamic ratio adjustment can also balance the aging rate of the two battery banks, extending their overall lifespan. When the power supply module resumes operation, the control module gradually reduces the output of the two battery banks until the power supply module completely takes over the load. Finally, according to the strategy, the battery banks are disconnected sequentially and the system enters a charging recovery state.

[0038] Additionally, in one embodiment, reference is made to Figure 6 ,exist Figure 5Step S25 of the illustrated embodiment also includes, but is not limited to, the following steps: Step S31: When the DC power supply module is operating normally, close the first switch and open the second switch so that the DC power supply module is connected to the power supply DC bus through the first switch; Step S32: When modifying or repairing the DC power supply module, close the second switch and then open the first switch so that the DC power supply module can be connected to the standard capacity battery pack or the backup capacity battery pack through the second switch and the power supply DC bus. After the DC power supply module has been modified or repaired, close the first switch first and then open the second switch so that the DC power supply module can be put into operation. Step S33: When the standard capacity battery pack is put into operation, close the third switch and the fourth switch to connect the standard capacity battery pack to the power supply DC bus. Step S34: When the backup capacity battery pack is put into operation, close the fifth switch and the sixth switch to connect the backup capacity battery pack to the power supply DC bus. Step S35: When the standard capacity battery pack and the backup capacity battery pack are put into operation at the same time, the third switch, the fourth switch, the fifth switch and the sixth switch are closed sequentially or simultaneously according to the order of the switch modules being put into operation. Step S36: When exiting the standard capacity battery pack, disconnect the third and fourth switches; when exiting the backup capacity battery pack, disconnect the fifth and sixth switches.

[0039] It should be noted that under normal operating conditions, the first switch is closed and the second switch is open, allowing the power supply module to connect directly to the DC power bus via the first switch. This minimizes the path and impedance, ensuring efficient power supply to or from the DC power bus. Simultaneously, the second switch is open, completely isolating the backup path and preventing circulating current or accidental backfeeding. When modifications or maintenance are required, the second switch is closed, establishing a backup power supply path that connects to the standard or backup capacity battery pack via the second switch and then the DC power bus. Once this backup path is stable, the first switch is opened. This allows for a smooth transfer of the current path from the first switch to the second switch, ensuring no voltage interruption or drop in the DC power bus during the switching process. After the modifications or maintenance are completed, the first switch is closed first, followed by the second switch, allowing the power supply module to resume operation via the main path, restoring the original power supply architecture.

[0040] Furthermore, when the standard capacity battery pack needs to be engaged, the third and fourth switches are closed to reliably connect the standard capacity battery pack to the DC power supply bus; when the standard capacity battery pack needs to be deactivated, the third and fourth switches are disconnected. Similarly, the backup capacity battery pack is engaged by closing the fifth and sixth switches and deactivated by disconnecting the fifth and sixth switches. When both the standard capacity battery pack and the backup capacity battery pack need to be engaged simultaneously, the control module can choose to close them sequentially (e.g., first closing the third and fourth switches of the standard capacity battery pack, then closing the fifth and sixth switches of the backup capacity battery pack) or simultaneously close all the third, fourth, fifth, and sixth switches, based on a preset strategy or real-time operating conditions, thereby completing the engagement of both the standard capacity battery pack and the backup capacity battery pack.

[0041] Additionally, in one embodiment, reference is made to Figure 7 ,exist Figure 6 Following step S31 in the illustrated embodiment, the following steps are included, but are not limited to: Step S41: The control module monitors in real time whether the impact load has disappeared or whether the power supply module has resumed operation; Step S42: When the impact load disappears, or when the power supply module resumes operation, the control module confirms the type of battery pack currently engaged in the battery module. When the battery pack type is a backup capacity battery pack, the fifth switch and the sixth switch are disconnected to remove the backup capacity battery pack, and the power supply module supplies power to the DC bus independently. Step S43: When both the standard capacity battery pack and the backup capacity battery pack are in operation, first disconnect the third and fourth switches to exit the standard capacity battery pack, and then disconnect the fifth and sixth switches to exit the backup capacity battery pack. During the exit process of the standard capacity battery pack and the backup capacity battery pack, the first switch is kept closed so that the DC power supply module can continuously distribute power to the DC load. Step S44: After the standard capacity battery pack and the backup capacity battery pack have exited, the control module controls the charging and discharging module to resume charging the battery module.

[0042] It should be noted that the control module continuously monitors in real time whether the impact load on the DC power supply bus has disappeared and whether the power supply module has returned to normal operation. These two conditions are prerequisites for determining whether the battery module can be disconnected. Only when the external disturbance is eliminated or the main power supply stabilizes again can the battery module be safely disconnected from the DC power supply bus to avoid premature disconnection leading to another loss of voltage on the bus.

[0043] The control module confirms that only the backup battery pack is currently supporting the DC power supply bus and that the exit conditions are met (e.g., the impact load disappears). Switches five and six are then disconnected, completely disconnecting the backup battery pack from the DC power supply bus. Since the power supply module has now returned to normal and can independently handle the entire load, the bus voltage of the DC power supply bus is maintained by the power supply module; therefore, the exit process will not cause a voltage drop or power interruption.

[0044] Both the standard capacity battery pack and the backup capacity battery pack are in operation (this occurs after a prolonged shock or power supply module failure). To ensure the DC power supply bus remains powered throughout the shutdown process, the control module shuts down the standard capacity battery pack first, followed by the backup capacity battery pack. First, the third and fourth switches corresponding to the standard capacity battery pack are disconnected. At this point, the DC power supply bus is still powered by the backup capacity battery pack and the power supply module. After the standard capacity battery pack is completely isolated, the fifth and sixth switches of the backup capacity battery pack are then disconnected. Since the standard capacity battery pack may have a deeper discharge during the initial shared power supply, while the backup capacity battery pack typically retains more energy (because it prioritizes short-term shocks and only contributes power later), shutting down the standard capacity battery pack first avoids voltage fluctuations caused by its sudden disconnection when its remaining capacity is low. The backup capacity battery pack continues to provide power until the power supply module fully takes over. Throughout the shutdown process, the first switch remains closed, ensuring that the DC power supply module continuously distributes power to the DC load. That is, regardless of the battery pack switching, the load side remains connected to the bus via the first switch, experiencing no interruption.

[0045] Once both the standard capacity battery pack and the backup capacity battery pack have completely disengaged, the control module determines that the DC power supply bus is now stably and independently powered by the power supply module. At this point, the control charging and discharging module resumes charging the battery modules. The charging strategy follows a preset equalization or float charging mode, recharging both the standard capacity battery pack and the backup capacity battery pack to full capacity (i.e., the second threshold) to prepare for the next disturbance. This ensures the energy of the battery modules is recyclable and maintains the system's long-term backup power supply capability.

[0046] Additionally, in one embodiment, reference is made to Figure 8 ,exist Figure 1 Step S15 of the illustrated embodiment also includes, but is not limited to, the following steps: Step S51: When the power supply module is operating stably and the current load value of the power supply DC bus is lower than the preset load value, the battery module is allowed to enter the full capacity working mode. Step S52: Control the standard capacity battery pack and the backup capacity battery pack in the battery module to discharge in turn or simultaneously to a first threshold, where the first threshold is 50% of the rated capacity; In step S53, during the discharge process, the control module monitors the voltage of the power supply DC bus in real time; if the voltage drops to the preset lower limit, the full capacity discharge is immediately suspended, and the power supply module and the battery packs that are not participating in the discharge supply the power supply DC bus. Step S54: When the discharge reaches the first threshold, control the charging and discharging module to charge the discharged battery pack until its capacity is restored to the second threshold, which is 75% of the rated capacity; In step S55, during the capacity expansion process, the DC power supply module normally distributes electrical energy to the DC load.

[0047] It should be noted that the control module is only allowed to activate the capacity-controlled mode when the power supply module can independently and stably support the DC bus, and the current bus load is lower than the preset load (i.e., the load is light and the power supply module has sufficient redundancy). This ensures that even if the battery module loses some capacity during the capacity-controlled discharge process, the power supply module can still maintain the voltage of the DC bus independently, avoiding voltage drops due to excessive load.

[0048] Furthermore, the standard capacity battery pack and the backup capacity battery pack in the battery module are controlled to discharge alternately or simultaneously to a first threshold (50% of rated capacity). 50% is chosen as the discharge termination point because this depth effectively assesses the actual remaining capacity and health status of the batteries without over-discharging and damaging them. Simultaneously, the strategy of alternating or simultaneous discharge of the two battery packs allows for flexible matching of different system redundancy requirements—alternating discharge allows for individual verification of the independent performance of each battery pack, while simultaneous discharge shortens the total capacity verification time, but it is necessary to ensure that the power supply module has sufficient redundancy to support the bus.

[0049] The control module monitors the voltage of the DC power supply bus in real time. When it detects that the voltage has dropped to a preset lower limit (indicating that the power supply module may be unable to independently support the bus due to load fluctuations or insufficient capacity), it immediately suspends the full-capacity discharge. At this time, the discharged battery packs stop discharging, and the power supply module and another battery pack that is not participating in the discharge jointly supply power to the DC power supply bus, ensuring that the voltage of the DC power supply bus quickly returns to the normal range.

[0050] Once the discharge successfully reaches the first threshold (50% of rated capacity), the charge / discharge module is controlled to charge the discharged battery pack until its capacity is restored to the second threshold (75% of rated capacity). It should be noted that the second threshold is set to 75% instead of 100%. This shortens charging time, improves core capacity efficiency, and ensures that the battery still has sufficient backup capacity at 75%. Once charging is complete, the battery pack can be put back into standby mode.

[0051] Additionally, in one embodiment, reference is made to Figure 9 ,exist Figure 1Following step S15 in the illustrated embodiment, the following steps are included, but are not limited to: Step S61: When an abnormality is detected in the power supply module or the voltage of the power supply DC bus drops below the preset safety threshold during the core capacity discharge process, the control module immediately stops the core capacity discharge process of the battery module and controls the charging and discharging module to switch to the supplementary charging mode, so that the power supply module and the charging and discharging module jointly maintain the voltage stability of the power supply DC bus. Step S62: When the power supply module returns to normal and the voltage of the power supply DC bus rises back to the rated range, the control module resumes the core capacity discharge process of the battery module and continues to complete the remaining core capacity discharge and charging operations.

[0052] It should be noted that when the core discharge is in progress and the control module detects an abnormality in the power supply module (such as output overload or input power failure) or the DC bus voltage drops below the preset safety threshold (indicating that the power supply module can no longer independently support the bus), the control module will immediately stop the core discharge process of the battery module, thereby preventing the battery module from continuing to discharge and further lowering the bus voltage, and avoiding the DC power supply module from malfunctioning or being damaged due to undervoltage.

[0053] Furthermore, once the control module detects that the power supply module has returned to normal and the voltage of the DC power supply bus has rebounded to the rated operating range (indicating that the main power supply has regained its independent load-carrying capacity), the control module resumes the interrupted capacity discharge process. The charging and discharging module is switched back to discharge mode, allowing the battery pack to continue discharging from its current remaining capacity until it reaches a predetermined first threshold (e.g., 50% of rated capacity), then it enters the charging phase, charging the battery pack to a second threshold (e.g., 75%). This avoids the need to restart the entire capacity assessment cycle due to a brief disturbance, significantly improving capacity assessment efficiency while ensuring the integrity of the battery module capacity evaluation.

[0054] Additionally, in one embodiment, reference is made to Figure 10 ,exist Figure 1 Step S12 of the illustrated embodiment also includes, but is not limited to, the following steps: Step S71: Obtain the current power supply information of the power supply module, wherein the current power supply information includes at least the output voltage, output current, voltage fluctuation range of the power supply DC bus, and state of charge of the battery module. Step S72: When the output voltage and output current of the power supply module are within the rated range and the state of charge of the battery module is higher than the preset high threshold, the control module confirms that the battery module has entered the full capacity working mode. Step S73: If the output voltage or current of the power supply module is abnormal, or the state of charge of the battery module is lower than the preset low threshold, confirm that the battery module enters the normal working mode to ensure the power supply of the DC bus and the charging of the battery module.

[0055] It should be noted that the output voltage and output current reflect the load capacity and health status of the power supply module, the bus voltage fluctuation range reflects the stability of the system, and the state of charge of the battery determines whether the battery has enough energy for core discharge without affecting the backup function.

[0056] It should be noted that the control module can only confirm that the core capacity can be activated when the output voltage and output current of the power supply module are both within the rated range (indicating that the main power supply is working normally and has sufficient redundancy), and the core charge of the battery module is higher than the preset high threshold (e.g., 110% to 90%, ensuring that there is still enough energy to cope with sudden disturbances after discharging to the first threshold of 50%).

[0057] Furthermore, when the output voltage or current of the power supply module becomes abnormal (such as overvoltage, undervoltage, overcurrent, or excessive fluctuations), it indicates that the main power supply itself is unstable. In this case, capacitive discharge will exacerbate fluctuations in the DC power supply bus, necessitating immediate cessation of capacitive discharge and transition to normal operating mode. This means the power supply module prioritizes maintaining the bus voltage and ensuring load power supply. When the battery module's charge level falls below a preset low threshold (e.g., 20%–30%), it indicates that the battery module's charge is already at a low level. Continuing capacitive discharge could lead to over-discharge of the battery module or its inability to cope with sudden power outages. Therefore, the capacitive discharge mode is forcibly exited, and normal operating mode is entered. The charging and discharging modules prioritize charging the battery module until the charge level recovers to a safe level. In addition, during normal operating mode, the power supply to the DC power supply bus remains uninterrupted, and the battery module serves only as a backup or charging load.

[0058] like Figure 11 As shown, Figure 11 This is a structural diagram of an energy distribution device based on a DC power supply system according to an embodiment of the present invention. The present invention also provides an energy distribution device based on a DC power supply system, comprising: The processor 1101 can be implemented using a general-purpose central processing unit (CPU), microprocessor, application specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 1102 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 1102 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1102 and is called and executed by the processor 1101 using the energy distribution method based on a DC power supply system according to the embodiments of this application. Input / output interface 1103 is used to implement information input and output; The communication interface 1104 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 1105 transmits information between various components of the device (e.g., processor 1101, memory 1102, input / output interface 1103, and communication interface 1104); The processor 1101, memory 1102, input / output interface 1103 and communication interface 1104 are connected to each other within the device via bus 1105.

[0059] This application also provides an electronic device, including an energy distribution device based on a DC power supply system as described above.

[0060] This application also provides a storage medium, which is a computer-readable storage medium, storing a computer program that, when executed by a processor, implements the above-described energy distribution method based on a DC power supply system.

[0061] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate, and may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0062] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0063] The above provides a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. An energy distribution method based on a DC power supply system, characterized in that, An application in a DC power supply system, the DC power supply system includes a DC power supply bus, a DC feeder module, a battery module, a power supply module, a charging / discharging module, and a control module. The DC power supply bus, the power supply module, and the battery module are all connected to the DC feeder module. The charging / discharging module is connected to both the battery module and the DC power supply bus. The control module is connected to the DC power supply bus, the DC feeder module, the battery module, the charging / discharging module, and the power supply module. The energy distribution method based on the DC power supply system includes: Obtain the current power supply information of the power supply module and the power supply DC bus; The control module determines the operating mode of the battery module based on the current power supply information, wherein the operating mode includes at least a normal operating mode and a capacity-controlled operating mode; When the battery module is in the normal working mode, the charging and discharging module charges the battery module, and the control module monitors the load status of the power supply DC bus in real time. When the control module detects an impact load, or when the power supply module is out of operation, the battery module is automatically put into operation to support the voltage of the DC power supply bus. When the impact load disappears or the power supply module is put into operation, the battery module is automatically put out of operation, and the DC power supply module continues to distribute power to the DC load. When the battery module operates in the capacity-controlled mode, it performs online capacity control. The control module controls the battery module to discharge to a first threshold and controls the charging and discharging module to charge the battery module until it is charged to a second threshold. The first threshold is less than the second threshold. When the battery module is discharging under capacity control, the power supply DC bus is maintained uninterrupted by the power supply module and the non-discharging portion of the battery module.

2. The energy distribution method for a DC power supply system according to claim 1, characterized in that, The battery module includes a standard capacity battery pack and a backup capacity battery pack. The automatic activation of the battery module to support the voltage of the DC power supply bus includes: When the control module detects the impact load, the control module controls the backup capacity battery pack to be connected to the DC power supply bus to support the bus voltage for a short time. The control module monitors the duration of the impact load and the discharge status of the backup capacity battery pack in real time. If the impact load disappears within a preset time, the connection between the backup capacity battery pack and the power supply DC bus is disconnected. If the duration of the impact load exceeds the preset time, or if the remaining capacity of the backup battery pack is lower than the preset lower threshold, the standard capacity battery pack is controlled to be connected to the power supply DC bus and the backup capacity battery pack to jointly support the voltage of the power supply DC bus. When the control module detects that the power supply module has stopped running, the control module determines the exit type of the power supply module, wherein the exit type includes planned exit and fault exit; When the exit type is the planned exit, the control module controls the standard capacity battery pack to be put into operation first, and then controls the backup capacity battery pack to be put into operation later, so as to smoothly transition the voltage of the power supply DC bus. When the exit type is the fault exit, the control module controls the standard capacity battery pack and the backup capacity battery pack to be put into operation simultaneously to provide uninterrupted power supply to the power supply DC bus. The control module dynamically adjusts the output ratio of the standard capacity battery pack and the backup capacity battery pack according to the load demand of the power supply DC bus until the power supply module resumes operation.

3. The energy distribution method for a DC power supply system according to claim 2, characterized in that, The DC power supply system further includes a switching module, which includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch. One end of the first switch and the second switch are connected to the DC power supply bus, and the other end of the first switch and the second switch are connected to the DC feeder module. One end of the third switch and the fourth switch are connected to the standard capacity battery pack, and the other end of the third switch and the fourth switch are connected to the DC power supply bus. One end of the fifth switch and the sixth switch are connected to the backup capacity battery pack, and the other end of the fifth switch and the sixth switch are connected to the DC power supply bus. The control module controls the standard capacity battery pack to be engaged first, and then controls the backup capacity battery pack to be engaged later, including: When the DC power supply module is operating normally, the first switch is closed and the second switch is opened, so that the DC power supply module is connected to the power supply DC bus through the first switch; When the DC power supply module is modified or repaired, the second switch is closed and the first switch is opened so that the DC power supply module is connected to the standard capacity battery pack or the backup capacity battery pack through the second switch and the power supply DC bus. After the DC power supply module is modified or repaired, the first switch is closed and the second switch is opened so that the DC power supply module is put into operation. When the standard capacity battery pack is put into operation, the third switch and the fourth switch are closed to connect the standard capacity battery pack to the power supply DC bus. When the backup battery pack is put into operation, the fifth switch and the sixth switch are closed to connect the backup battery pack to the DC power supply bus. When the standard capacity battery pack and the backup capacity battery pack are put into operation at the same time, the third switch, the fourth switch, the fifth switch and the sixth switch are closed sequentially or simultaneously according to the order in which the switch modules are put into operation. When exiting the standard capacity battery pack, disconnect the third and fourth switches; when exiting the backup capacity battery pack, disconnect the fifth and sixth switches.

4. The energy distribution method for a DC power supply system according to claim 3, characterized in that, Once the impact load disappears or the power supply module is put into operation, the battery module automatically disconnects, and the DC power supply module continues to distribute power to the DC load, including: The control module monitors in real time whether the impact load has disappeared or whether the power supply module has resumed operation. When the battery module meets the exit conditions, the control module confirms the type of battery pack currently in operation. When the battery pack type is a backup capacity battery pack, the fifth switch and the sixth switch are disconnected to exit the backup capacity battery pack, and the power supply module supplies power to the power supply DC bus alone. When both the standard capacity battery pack and the backup capacity battery pack are in operation, the third switch and the fourth switch are first disconnected to exit the standard capacity battery pack, and then the fifth switch and the sixth switch are disconnected to exit the backup capacity battery pack. During the exit process of the standard capacity battery pack and the backup capacity battery pack, the first switch is kept closed so that the DC power supply module can continuously distribute power to the DC load. After the standard capacity battery pack and the backup capacity battery pack have finished discharging, the control module controls the charging and discharging module to resume charging the battery module.

5. The energy distribution method for a DC power supply system according to claim 1, characterized in that, The battery module performs online capacity verification, including: When the power supply module is operating stably and the current load value of the power supply DC bus is lower than the preset load value, the battery module is allowed to enter the full capacity working mode. The standard capacity battery pack and the backup capacity battery pack in the battery module are controlled to discharge alternately or simultaneously to a first threshold, where the first threshold is 50% of the rated capacity; During the discharge process, the control module monitors the voltage of the power supply DC bus in real time; if the voltage drops to the preset lower limit, the full capacity discharge is immediately suspended, and the power supply module and the battery packs that are not participating in the discharge supply the power supply DC bus. When the discharge reaches the first threshold, the charging and discharging module is controlled to charge the discharged battery pack until its capacity is restored to the second threshold, which is 75% of the rated capacity. During the capacity expansion process, the DC power supply module normally distributes electrical energy to the DC load.

6. The energy distribution method for a DC power supply system according to claim 1, characterized in that, The method further includes, until the battery module is charged to the second threshold: When an abnormality is detected in the power supply module or the voltage of the power supply DC bus drops below a preset safety threshold during the core discharge process, the control module immediately stops the core discharge process of the battery module and controls the charging and discharging module to switch to supplementary charging mode, so that the power supply module and the charging and discharging module jointly maintain the voltage stability of the power supply DC bus. Once the power supply module returns to normal and the voltage of the DC power supply bus rises back to the rated range, the control module resumes the core capacity discharge process of the battery module and continues to complete the remaining core capacity discharge and charging operations.

7. The energy distribution method for a DC power supply system according to claim 1, characterized in that, After the control module confirms the operating mode of the battery module based on the current power supply information, the method further includes: Obtain the current power supply information of the power supply module, wherein the current power supply information includes at least the output voltage and output current of the power supply module, the voltage fluctuation range of the power supply DC bus, and the state of charge of the battery module; When the output voltage and output current of the power supply module are within the rated range, and the state of charge of the battery module is higher than the preset high threshold, the control module confirms that the battery module enters the core capacity working mode. If the output voltage or current of the power supply module is abnormal, or if the state of charge of the battery module is lower than a preset low threshold, the battery module is confirmed to enter the normal working mode to ensure the power supply of the DC bus and the charging of the battery module.

8. An energy distribution device for a DC power supply system, characterized in that, It includes at least one control processor and a memory for communicatively connecting to the at least one control processor; the memory stores instructions executable by the at least one control processor, which, when executed by the at least one control processor, enable the at least one control processor to perform the energy distribution method of the DC power supply system as described in any one of claims 1 to 7.

9. An electronic device, characterized in that, It includes the energy distribution device of the DC power supply system as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the energy distribution method of the DC power supply system as described in any one of claims 1 to 7.

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