Smart battery capacity distribution system

Abstract

The utility model relates to the technical field, and discloses an intelligent battery capacity distribution system, comprising a battery which is connected with a DC input power supply and supplies power to a load through a remote electric operation module; the data acquisition module is respectively connected with the battery, the load and the alternating current input power supply and is used for acquiring parameters of the battery, the load and the alternating current input power supply and sending the acquired parameters to the centralized monitoring module; the centralized monitoring module is connected with the remote electric operation module and the integrated automation background and used for calculating the battery capacity and the load importance degree according to the parameters sent by the data acquisition module, generating a battery discharge curve and controlling the remote electric operation module to enable the battery to supply power to the load with the high importance degree when the battery capacity is lower than a set threshold value. And the load with low importance degree is disconnected, and the battery discharge curve and the control of the remote electric operation module are fed back to the integrated automation background. Energy distribution is carried out on the load in the DC power supply system so that the battery can supply power for a long time as far as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to an intelligent battery capacity allocation system for optimizing the energy allocation of batteries in a substation DC system. Background Art

[0002] In DC integrated power supply systems and communication power supply systems, to ensure the stable operation of loads (electrical equipment), a two-stage AC power supply method is adopted. When one of the AC voltages shows abnormalities (such as overvoltage, undervoltage, phase loss, etc.), the AC power of that path is disconnected and switched to the other normal AC power, thus ensuring the normal operation of the DC bus. The DC bus usually mounts batteries (or battery packs) that are relatively matched to the load capacity to ensure that the power supply system uses the batteries to supply power to the DC bus during the AC switching process or when both AC power supplies are abnormal.

[0003] Due to the limited capacity of the batteries, the batteries in general DC systems cannot meet long-term discharge requirements, and it is necessary for maintenance personnel to troubleshoot the cause of AC power loss within a short time and restore AC power supply. However, in some remote substation areas or for some difficult faults, it may be impossible to restore AC power supply before the battery power is exhausted. Summary of the Utility Model

[0004] The purpose of the utility model is to allocate energy to the loads in the DC power supply system, enabling the batteries to supply power for as long as possible, and providing an intelligent battery capacity allocation system.

[0005] To achieve the above-mentioned utility model purpose, the embodiments of the utility model provide the following technical solutions:

[0006] An intelligent battery capacity allocation system, connected to a load, includes:

[0007] A battery, connected to a DC input power supply and supplying power to the load through a remote electric operation module;

[0008] A data acquisition module, connected to the battery, the load, and the AC input power supply respectively, for acquiring the parameters of the battery, the load, and the AC input power supply, and sending the acquired parameters to a centralized monitoring module;

[0009] A centralized monitoring module, connected to the remote electric operation module and the integrated automation background respectively, for calculating the battery capacity and the importance level of the load according to the parameters sent by the data acquisition module, generating a battery discharge curve, and when the battery capacity is lower than a set threshold, controlling the remote electric operation module to make the battery supply power to the load with a high importance level, and disconnecting the load with a low importance level, and feeding back the battery discharge curve and the control of the remote electric operation module to the integrated automation background;

[0010] The integrated automation background is used to display the battery discharge curve and the connection status between the remote electric operation module and the load.

[0011] The data acquisition module includes an AC status acquisition unit. The AC status acquisition unit is connected to the AC input power supply. By obtaining the three-phase current and voltage of the AC input power supply, it determines whether the AC input power supply is abnormal. If it is abnormal, it sends a request for the battery to supply power to the load to the centralized monitoring module. The centralized monitoring module controls the remote electric operation module to connect the battery to the load for power supply.

[0012] The data acquisition module also includes a battery current acquisition unit and a battery voltage acquisition unit. The battery current acquisition unit and the battery voltage acquisition unit are respectively connected to the battery, and are used to obtain the supply current and voltage of the battery and send them to the centralized monitoring module.

[0013] The data acquisition module also includes a load current acquisition unit. When the AC input power supply supplies power to the load or the battery supplies power to the load, the load current acquisition unit real-time collects the working current of the load and feeds it back to the centralized monitoring module.

[0014] The centralized monitoring module includes a battery capacity calculation unit. The battery capacity calculation unit is used to calculate the remaining capacity of the battery according to the supply current and capacitance of the battery sent by the battery current acquisition unit and the battery voltage acquisition unit.

[0015] The centralized monitoring module also includes a discharge curve generation unit. The discharge curve generation unit is used to generate a battery discharge curve according to the changing capacity of the battery.

[0016] The centralized monitoring module also includes a load status integration unit. The load status integration unit is used to analyze the importance of the load according to the working current of the load fed back by the load current acquisition unit.

[0017] The remote electric operation module includes multiple switches. Each switch is connected to each load one by one, and is used to control the connection and disconnection between the battery and each load. When the remaining capacity of the battery is lower than the set threshold, the switch between the battery and the load with a lower importance is disconnected.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: By monitoring the real-time comparison of the voltage and current of the battery with the set threshold, when the battery capacity drops to a certain extent, the power supply to some secondary loads is disconnected to achieve the purpose of saving power, which can extend the running and discharging time of the battery, realize the long-term power supply of the DC input system, intelligently distribute the power supply of the battery, improve the power supply efficiency and endurance of the battery, do not require manual intervention, reduce the operation and maintenance cost, and ensure the safe operation of the substation. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant accompanying drawings can also be obtained based on these drawings.

[0020] Figure 1 It is the block diagram of the present utility model;

[0021] Figure 2 It is a more detailed block diagram of the present utility model;

[0022] Figure 3 It is a schematic diagram of an equivalent circuit for an embodiment of the present utility model. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that: similar reference numerals and letters represent similar items in the following accompanying drawings. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings. At the same time, in the description of the present utility model, terms such as "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance, or implying any such actual relationship or order between these entities or operations.

[0025] Embodiment:

[0026] The present utility model is realized through the following technical solutions, such as Figure 1As shown in the figure, an intelligent battery capacity allocation system is connected to a load and includes a battery, a data acquisition module, a centralized monitoring module, a remote electric operation module, and a comprehensive automation background. The battery is connected to a DC input power supply, and the battery powers the load through the remote electric operation module. The input ends of the data acquisition module are respectively connected to the battery, the load, and the AC input power supply, and are used to collect the states of the battery, the load, and the AC input power supply. The states include parameters such as current and voltage, and the collected parameters are sent to the centralized monitoring module. The output ends of the centralized monitoring module are respectively connected to the remote electric operation module and the comprehensive automation background, and are used to calculate the battery capacity and the importance degree of the load according to the parameters sent by the data acquisition module, generate a battery discharge curve, and when the battery capacity is lower than the set threshold, control the remote electric operation module so that the battery only powers the load with a high importance degree, and disconnect the load with a low importance degree, and feedback the battery discharge curve and the control of the remote electric operation module to the comprehensive automation background.

[0027] Specifically, please refer to Figure 2 , the data acquisition module includes a battery current acquisition unit, a battery voltage acquisition unit, a load current acquisition unit, and an AC status acquisition unit. The AC status acquisition unit is connected to the AC input power supply, and by obtaining the three-phase current and voltage of the AC input power supply, it judges whether the AC input power supply is abnormal. If it is abnormal, it sends a request for the battery to power the load to the centralized monitoring module, and the centralized monitoring module controls the remote electric operation module to connect the battery to the load for power supply.

[0028] The battery current acquisition unit and the battery voltage acquisition unit are respectively connected to the battery, and are used to obtain the supply current and voltage of the battery and send them to the centralized monitoring module, and the centralized monitoring module calculates the remaining capacity of the battery.

[0029] Whether the AC input power supply or the battery powers the load, the load current acquisition unit always collects the working current of the load in real time and feeds it back to the centralized monitoring module, and the centralized monitoring module analyzes the importance degree of the load through long-term data accumulation.

[0030] Please continue to refer to Figure 2 , the centralized monitoring module includes a battery capacity calculation unit, a discharge curve generation unit, and a load status integration unit. The battery capacity calculation unit is used to calculate the remaining capacity of the battery according to the supply current and capacitance of the battery sent by the battery current acquisition unit and the battery voltage acquisition unit. The discharge curve generation unit generates a battery discharge curve according to the changing capacity of the battery. For example, the abscissa of the battery discharge curve is the discharge time, and the ordinate is the remaining capacity of the battery.

[0031] The load status integration unit analyzes the importance of each load based on the load current sent by the load current acquisition unit. When analyzing the importance of the load, the importance of the load can be judged from the perspective of the load usage duration, or / and the load power, etc. For example, when judging based on the load usage duration, if the obtained load current is not zero for a long time, it means that the load is used for a long time, such as a refrigerator, and its importance is high; another example is when judging based on the load power, if the obtained load power is large, it means that the load is almost an industrial operation, such as a factory machine, and its importance is also high; it is also possible to judge based on the load usage duration and the load power at the same time. This solution is only for example, and the method of analyzing the importance of the load is not limited, and can be determined according to the actual situation.

[0032] The remaining capacity of the battery can be calculated according to the actual circuit connection relationship. This embodiment gives an equivalent circuit diagram, such as Figure 3 shown, but this solution is not limited to this connection method. Please refer to Figure 3 , assuming that the battery supplies power to N loads, where the resistance of the i-th load is R i , i = 1, 2,... N, the data acquisition module is connected with a sampling resistor R L , and the internal resistance of the battery is R C ; the remote electric operation module includes N switches, and each switch is correspondingly connected to a load to control the on and off between the battery and the load. After collecting the voltage across the sampling resistor RL, as the discharge time changes, the discharge capacity C of the battery can be calculated, and then the remaining capacity of the battery can be obtained by subtracting the discharge capacity from the initial capacity of the battery.

[0033] When the remaining capacity of the battery is lower than the set threshold, the centralized monitoring module controls the switch S i corresponding to the load R i to disconnect, so that the battery only supplies power to the loads with high importance, achieving the purpose of saving power. In a further solution, multiple set thresholds can be set to correspond to different importance levels of the loads, and the loads with lower importance are disconnected in stages.

[0034] The centralized monitoring module feeds back the battery discharge curve, battery status parameters, AC input power supply status parameters, and the connection status of the remote electric operation module to the integrated automation background in real time for maintenance personnel to view in time.

[0035] In a further solution, the centralized monitoring module further includes a battery life prediction unit, which is used to calculate the capacity degradation factor after obtaining the state of charge of the battery through the data acquisition module:

[0036]

[0037] Among them, D(t) is the capacity degradation factor of the battery; SOC(t) is the state of charge of the battery; SOC ref (t) is the reference value of the state of charge at different times; t is the reference time of the state of charge; s is the degradation factor coefficient.

[0038] The actual maximum capacity of the battery is:

[0039]

[0040] Among them, C p is the original maximum capacity of the battery; C u is the actual maximum capacity of the battery. Therefore, when calculating the remaining capacity of the battery, the remaining capacity obtained by subtracting the discharge capacity from C u is more accurate.

[0041] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. An intelligent battery capacity allocation system, connected to a load, characterized in that: Including: A battery, connected to a DC input power supply, and supplying power to a load through a remote electric operation module; A data acquisition module, connected to the battery, the load, and the AC input power supply respectively, for acquiring the parameters of the battery, the load, and the AC input power supply, and sending the acquired parameters to the centralized monitoring module; A centralized monitoring module, connected to the remote electric operation module and the integrated automation background respectively, for calculating the battery capacity and the importance degree of the load according to the parameters sent by the data acquisition module, generating a battery discharge curve, and when the battery capacity is lower than the set threshold, controlling the remote electric operation module to make the battery supply power to the load with a high importance degree, while disconnecting the load with a low importance degree, and feeding back the battery discharge curve and the control of the remote electric operation module to the integrated automation background; The integrated automation background is used for displaying the battery discharge curve and the connection status between the remote electric operation module and the load.

2. The intelligent battery capacity allocation system according to claim 1, wherein: The data acquisition module includes an AC status acquisition unit. The AC status acquisition unit is connected to the AC input power supply. By obtaining the three-phase current and voltage of the AC input power supply, it judges whether the AC input power supply is abnormal. If it is abnormal, it sends a request for the battery to supply power to the load to the centralized monitoring module, and the centralized monitoring module controls the remote electric operation module to connect the battery to the load for power supply.

3. The intelligent battery capacity allocation system according to claim 1, wherein: The data acquisition module further includes a battery current acquisition unit and a battery voltage acquisition unit. The battery current acquisition unit and the battery voltage acquisition unit are respectively connected to the battery, for obtaining the supply current and voltage of the battery, and sending them to the centralized monitoring module.

4. The intelligent battery capacity allocation system according to claim 1, wherein: The data acquisition module further includes a load current acquisition unit. When the AC input power supply supplies power to the load or the battery supplies power to the load, the load current acquisition unit real-time acquires the working current of the load and feeds it back to the centralized monitoring module.

5. The intelligent battery capacity allocation system according to claim 3, characterized in that: The centralized monitoring module includes a battery capacity calculation unit, which is used for calculating the remaining capacity of the battery according to the battery supply current and capacitance sent by the battery current acquisition unit and the battery voltage acquisition unit.

6. The intelligent battery capacity allocation system according to claim 5, characterized in that: The centralized monitoring module further includes a discharge curve generation unit, which is used for generating a battery discharge curve according to the changing capacity of the battery.

7. The intelligent battery capacity allocation system according to claim 4, characterized in that: The centralized monitoring module further includes a load status integration unit, which is used for analyzing the importance degree of the load according to the load working current fed back by the load current acquisition unit.

8. The intelligent battery capacity allocation system according to claim 7, wherein: The remote electric operation module includes a plurality of switches. Each switch is connected to each load in one-to-one correspondence, for controlling the connection and disconnection between the battery and each load. When the remaining capacity of the battery is lower than the set threshold, the switch between the battery and the load with a lower importance degree is disconnected.

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