A floating charge voltage management method and system for energy storage batteries in a distribution network

Abstract

The present invention discloses a method and system for managing the floating charge voltage of energy storage batteries in a distribution network. The present invention calculates the SOC of the storage battery based on the collected voltage and current data, and controls the floating charge voltage of the storage battery according to the floating charge voltage, floating charge current, SOC, and the surface temperature of the storage battery, so as to meet the requirements of the floating charge voltage within the range specified in the standard "Technical Regulations for Operation and Maintenance of DC Power Supply Devices with Storage Batteries for Power Systems" (DL / T 724-2000). As the operating time of the battery increases, the active substances inside each storage battery decrease to varying degrees, and its internal resistance also changes, so the battery SOC will also change accordingly. The effective capacity of the storage battery also has a certain impact on the floating charge voltage. The smaller the effective capacity, the more appropriately the floating charge voltage should be reduced. The present invention takes into account the influence of the battery temperature and the remaining capacity of the storage battery on the demand for the floating charge voltage, and prevents the floating charge voltage of the storage battery from exceeding the limit due to the increase in the battery temperature and the increase in the internal resistance of the storage battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a method and system for managing the floating charge voltage of a distribution network energy storage battery. Background Art

[0002] A distribution network refers to a power grid that receives electric energy from a transmission network or a regional power plant and distributes it locally through distribution facilities or step by step according to voltage levels to various users. It is composed of overhead lines, cables, poles, distribution transformers, disconnect switches, reactive power compensators, and some auxiliary facilities, etc., and plays an important role in distributing electric energy in the power grid.

[0003] Currently, in a distribution network system, a large number of storage batteries are used to provide DC power for relay protection devices, remote control devices, and communication devices in switchyards and distribution rooms. These devices are crucial for maintaining the reliable and safe operation of the distribution network. When the station transformer fails, the storage batteries are required to provide DC power for these devices. However, due to the large number of storage batteries and the wide geographical distribution of switchyards and distribution rooms, the maintenance efficiency of the storage batteries by maintenance personnel is reduced, and it is inevitable to have negligence during work, which greatly affects the service life of the storage batteries and increases the operation and maintenance costs of the distribution network.

[0004] The service life of a battery mainly depends on two aspects: the number of charge and discharge cycles and the optimized management of charge and discharge. The storage batteries in the distribution network are in a floating charge state for a long time, and the floating charge voltage is constant and higher than the rated floating charge voltage of the storage battery, resulting in crystallization at the electrodes, a reduction in the active substances in the internal solution of the storage battery, and a significant shortening of its service life. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a distribution network energy storage battery floating charge voltage management system that can achieve battery floating charge voltage management and avoid over-limitation of the floating charge voltage.

[0006] To solve the above problems, the present invention provides a method for managing the floating charge voltage of a distribution network energy storage battery, and the method for managing the floating charge voltage of the distribution network energy storage battery includes:

[0007] S1. Calculate the SOC of the current state of the battery according to the voltage and current of the distribution network energy storage battery under the charging state collected in real time;

[0008] S2. Determine whether the battery SOC is lower than 80%. When the battery SOC is greater than or equal to 80%, execute step S3;

[0009] S3. Determine whether the battery is in a floating charge state; if so, execute step S4; otherwise, determine that the battery is in a charging or discharging state, and re-execute step S1;

[0010] S4. Calculate the temperature adjustment multiple of the floating charge voltage based on the battery surface temperature collected in real time;

[0011] S5. Determine whether the remaining capacity of the battery is lower than 90% of the rated capacity; if so, execute step S6; otherwise, execute step S7;

[0012] S6. Consider the influence of the remaining capacity of the battery on the floating charge voltage, fit the fitting curve between the remaining capacity and the floating charge voltage, perform capacity compensation adjustment on the floating charge voltage according to the fitting curve, and then perform temperature compensation adjustment on the floating charge voltage after capacity compensation adjustment;

[0013] S7. Without considering the influence of the battery SOC on the floating charge voltage, directly perform temperature compensation adjustment on the floating charge voltage of the battery; after calculating the floating charge voltage adjustment value, continue to judge whether it meets the target floating charge voltage range; if so, use the calculated floating charge voltage adjustment value to perform floating charge voltage adjustment; otherwise, select the value closest to the target floating charge voltage range for floating charge voltage adjustment.

[0014] In an embodiment of the present invention, in step S4, the temperature adjustment multiple of the floating charge voltage is calculated according to the following formula:

[0015] N = T S -T e

[0016] where, T S represents the temperature of the battery surface, T e represents the rated temperature of the battery, and N represents the temperature adjustment multiple of the floating charge voltage.

[0017] In an embodiment of the present invention, in step S6, the temperature compensation adjustment is performed on the floating charge voltage after capacity compensation adjustment through the following formula:

[0018] V fmax = V soc - 0.003·N

[0019] where, V soc represents the floating charge voltage after capacity compensation adjustment, V fmax represents the maximum floating charge voltage allowed for the battery at the current temperature, and N represents the temperature adjustment multiple of the floating charge voltage.

[0020] In an embodiment of the present invention, in step S7, the temperature compensation adjustment of the floating charge voltage of the battery is performed according to the following formula:

[0021] V fmax = V f - 0.003N

[0022] where, V fIndicates the maximum floating charge voltage allowed for the battery at the rated temperature, V fmax Indicates the maximum floating charge voltage allowed for the battery at the current temperature, and N represents the floating charge voltage temperature adjustment multiple.

[0023] In an embodiment of the present invention, in step S2, when the battery SOC is lower than 80%, it is prompted that the battery needs to be replaced.

[0024] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the method described in any one of the above are implemented.

[0025] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method described in any one of the above are implemented.

[0026] The present invention also provides a floating charge voltage management system for a distribution network energy storage battery, which is used to execute the floating charge voltage management method for a distribution network energy storage battery described in any one of the above. The floating charge voltage management system for a distribution network energy storage battery includes an AC / DC converter, a charging management module, a distribution network energy storage battery, an MCU, a floating charge voltage management module, a voltage and current acquisition module, a battery temperature acquisition module, and an SOC calculation module. The AC / DC converter is connected to the distribution network AC bus and is used to convert alternating current into direct current. Both the distribution network energy storage battery and the AC / DC converter are connected to the charging management module. The distribution network energy storage battery is connected to the floating charge voltage management module. The charging management module is used for controlling the battery charging method and monitoring the charging voltage and current. The voltage and current acquisition module, the battery temperature acquisition module, and the SOC calculation module are all connected to the MCU. The voltage and current acquisition module is used to acquire the voltage and current of the distribution network energy storage battery in the charging state. The battery temperature acquisition module is used to acquire the surface temperature of the distribution network energy storage battery in the charging state. The SOC calculation module is used to calculate the battery SOC. The MCU is connected to the floating charge voltage management module. The MCU is used to perform logical processing on the data and output a control signal to the floating charge voltage management module. The floating charge voltage management module is used to adjust the magnitude of the output floating charge voltage.

[0027] In an embodiment of the present invention, the floating charge voltage management module adjusts the floating charge voltage by adjusting the duty cycle of the switch tube of the DC-DC.

[0028] In an embodiment of the present invention, the battery temperature acquisition module is a temperature sensor.

[0029] Advantages of the present invention:

[0030] The floating charge voltage management method and system for the energy storage battery of the distribution network in the present invention calculate the SOC of the storage battery through the collected voltage and current data, and control the floating charge voltage of the storage battery according to the floating charge voltage, floating charge current, SOC and the surface temperature of the storage battery, so as to meet the requirements of the floating charge voltage within the range specified in the Standard for Operation and Maintenance of DC Power Supply Devices of Storage Batteries for Power Systems (DL / T 724-2000). As the operation time of the battery increases, the active substances inside each storage battery are reduced to varying degrees, its internal resistance will also change, and the battery SOC will also change accordingly. The effective capacity of the storage battery also has a certain impact on the floating charge voltage. The smaller the effective capacity, the more appropriate the reduction of its floating charge voltage. The floating charge voltage management method and system for the energy storage battery of the distribution network in the present invention consider the influence of the battery temperature and the remaining capacity of the storage battery on the demand for the floating charge voltage, and prevent the floating charge voltage of the storage battery from exceeding the limit due to the increase in the battery temperature and the increase in the internal resistance of the storage battery.

[0031] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of the floating charge voltage management system for the energy storage battery of the distribution network in the embodiment of the present invention;

[0033] Figure 2 is a flowchart of the floating charge voltage management method for the energy storage battery of the distribution network in the embodiment of the present invention. Detailed Embodiment

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the specific embodiments given are not intended to limit the present invention.

[0035] As Figure 2 shown, the preferred embodiment of the present invention discloses a floating charge voltage management method for the energy storage battery of the distribution network. The floating charge voltage management method for the energy storage battery of the distribution network includes the following steps:

[0036] Step S1: Calculate the SOC of the battery in the current state according to the voltage and current of the energy storage battery of the distribution network collected in real time during the charging state;

[0037] Step S2: Determine whether the battery SOC is lower than 80%. When the battery SOC is greater than or equal to 80%, execute Step S3; further, when the battery SOC is lower than 80%, it indicates that the requirements of the circuit industry standard are not met, and it is prompted that the battery needs to be replaced.

[0038] Step S3: Determine whether the battery is in the floating charge state. If so, execute Step S4; otherwise, determine that the battery is in the charging or discharging state, and re-execute Step S1.

[0039] Step S4: Calculate the floating charge voltage temperature adjustment multiple based on the real-time collected battery surface temperature.

[0040] Specifically, calculate the floating charge voltage temperature adjustment multiple according to the following formula:

[0041] N = T S -25

[0042] where T S represents the temperature of the battery surface, and N represents the floating charge voltage temperature adjustment multiple.

[0043] Step S5: Determine whether the remaining capacity of the battery is lower than 90% of the rated capacity. If so, execute Step S6; otherwise, execute Step S7.

[0044] Step S6: Consider the influence of the remaining capacity of the battery on the floating charge voltage, fit the fitting curve between the remaining capacity and the floating charge voltage, perform capacity compensation adjustment on the floating charge voltage according to the fitting curve, and then perform temperature compensation adjustment on the floating charge voltage after capacity compensation adjustment.

[0045] Specifically, perform temperature compensation adjustment on the floating charge voltage after capacity compensation adjustment through the following formula:

[0046] V fmax = V soc - 0.003·N

[0047] where V soc represents the floating charge voltage after capacity compensation adjustment, V fmax represents the maximum allowable floating charge voltage of the battery at the current temperature, and N represents the floating charge voltage temperature adjustment multiple.

[0048] Step S7: Without considering the influence of the battery SOC on the floating charge voltage, directly perform temperature compensation adjustment on the floating charge voltage of the battery. After calculating the floating charge voltage adjustment value, continue to determine whether it meets the target floating charge voltage range. If so, use the calculated floating charge voltage adjustment value to adjust the floating charge voltage; otherwise, select the value closest to the target floating charge voltage range for floating charge voltage adjustment. Optionally, the target floating charge voltage is within the range required by the standard "Technical Regulations for Operation and Maintenance of DC Power Supply Devices with Batteries for Power Systems" (DL / T 724 - 2000).

[0049] Specifically, perform temperature compensation adjustment on the floating charge voltage of the battery according to the following formula:

[0050] Vfmax = V f -0.003N

[0051] Wherein, V f represents the maximum floating charge voltage allowed for the battery at the rated temperature, V fmax represents the maximum floating charge voltage allowed for the battery at the current temperature, and N represents the floating charge voltage temperature adjustment multiple.

[0052] The floating charge voltage management method for the energy storage battery of the distribution network in the present invention calculates the SOC of the storage battery through the collected voltage and current data, and controls the floating charge voltage of the storage battery according to the floating charge voltage, floating charge current, SOC and the surface temperature of the storage battery, so as to meet the requirements of the floating charge voltage within the range in the standard "Technical Regulations for Operation and Maintenance of DC Power Supply Devices of Storage Batteries for Power Systems" (DL / T 724-2000). As the operation time of the battery increases, the active substances inside each storage battery are reduced to varying degrees, and its internal resistance will also change accordingly, and then the battery SOC will also change. The effective capacity of the storage battery also has a certain influence on the floating charge voltage. The smaller the effective capacity, the more appropriate the reduction of its floating charge voltage. The floating charge voltage management method for the energy storage battery of the distribution network in the present invention takes into account the influence of the storage battery temperature and the remaining capacity of the storage battery on the floating charge voltage demand, and prevents the floating charge voltage of the storage battery from exceeding the limit due to the increase of the storage battery temperature and the increase of the internal resistance of the storage battery.

[0053] A preferred embodiment of the present invention also discloses an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the method described in any one of the above embodiments are implemented.

[0054] A preferred embodiment of the present invention also discloses a computer-readable storage medium, on which a computer program is stored. The characteristic is that when the program is executed by a processor, the steps of the method described in any one of the above embodiments are implemented.

[0055] Such as Figure 1As shown in the figure, a floating charge voltage management system for a distribution network energy storage battery is further disclosed in a preferred embodiment of the present invention, which is used to execute any of the above-mentioned distribution network energy storage battery floating charge voltage management methods, and includes an AC / DC converter, a charging management module, a distribution network energy storage battery, an MCU, a floating charge voltage management module, a voltage and current acquisition module, a battery temperature acquisition module, and an SOC calculation module. The AC / DC converter is connected to the distribution network AC bus and is used to convert alternating current into direct current. Both the distribution network energy storage battery and the AC / DC converter are connected to the charging management module. The distribution network energy storage battery is connected to the floating charge voltage management module. The charging management module is used for controlling the battery charging method and monitoring the charging voltage and current. The voltage and current acquisition module, the battery temperature acquisition module, and the SOC calculation module are all connected to the MCU. The voltage and current acquisition module is used to acquire the voltage and current of the distribution network energy storage battery in the charging state. The battery temperature acquisition module is used to acquire the surface temperature of the distribution network energy storage battery in the charging state. The SOC calculation module is used to calculate the battery SOC. The MCU is connected to the floating charge voltage management module. The MCU is used for logically processing data and outputting a control signal to the floating charge voltage management module. The floating charge voltage management module is used to adjust the magnitude of the output floating charge voltage.

[0056] Specifically, the battery temperature acquisition module is a temperature sensor.

[0057] Specifically, the floating charge voltage management module adjusts the floating charge voltage by adjusting the duty cycle of the switch tube of the DC-DC.

[0058] The floating charge voltage management system for the distribution network energy storage battery of the present invention calculates the SOC of the storage battery based on the acquired voltage and current data, and controls the floating charge voltage of the storage battery according to the floating charge voltage, floating charge current, SOC, and the surface temperature of the storage battery, so as to meet the requirements of the floating charge voltage within the range specified in the standard "Technical Regulations for Operation and Maintenance of DC Power Supply Devices for Batteries in Power Systems" (DL / T 724-2000). As the operating time of the battery increases, the active substances inside each storage battery decrease to varying degrees, and its internal resistance also changes, so the battery SOC will also change accordingly. The effective capacity of the storage battery also has a certain impact on the floating charge voltage. The smaller the effective capacity, the more appropriate the floating charge voltage should be reduced. The floating charge voltage management system for the distribution network energy storage battery of the present invention takes into account the influence of the battery temperature and the remaining capacity of the storage battery on the floating charge voltage demand, and prevents the floating charge voltage of the storage battery from exceeding the limit due to the increase in the battery temperature and the increase in the internal resistance of the storage battery.

[0059] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or multiple flows and / or blocks

[0061] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one or more of the flows Figure 1 or multiple flows and / or blocks

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or multiple flows and / or blocks

[0063] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A method for managing the floating charge voltage of a storage battery in a distribution network, characterized in that, Including: S1. Calculate the SOC of the current state of the battery based on the voltage and current of the distribution network energy storage battery under the charging state collected in real time; S2. Determine whether the battery SOC is lower than 80%. When the battery SOC is greater than or equal to 80%, execute step S3; S3. Determine whether the battery is in the floating charge state; If so, execute step S4; otherwise, determine that the battery is in the charging or discharging state, and re-execute step S1; S4. Calculate the floating charge voltage temperature adjustment multiple based on the surface temperature of the battery collected in real time; S5. Determine whether the remaining capacity of the battery is lower than 90% of the rated capacity. If so, execute step S6; Otherwise, execute step S7; S6. Consider the influence of the remaining capacity of the battery on the floating charge voltage, fit the fitting curve between the remaining capacity and the floating charge voltage, perform capacity compensation adjustment on the floating charge voltage according to the fitting curve, and then perform temperature compensation adjustment on the floating charge voltage after capacity compensation adjustment; S7. Without considering the influence of the battery SOC on the floating charge voltage, directly perform temperature compensation adjustment on the floating charge voltage of the battery; After calculating the floating charge voltage adjustment value, continue to determine whether it meets the target floating charge voltage range. If so, use the calculated floating charge voltage adjustment value to adjust the floating charge voltage; Otherwise, select the value closest to the target floating charge voltage range for floating charge voltage adjustment.

2. The floating charge voltage management method for a distribution network energy storage battery according to claim 1, wherein, In step S4, calculate the floating charge voltage temperature adjustment multiple according to the following formula: N = T S -T e Among them, T S represents the temperature on the battery surface, and T e represents the rated temperature of the battery, and N represents the floating charge voltage temperature adjustment multiple.

3. A method for managing the floating charge voltage of a storage battery in a distribution network according to claim 1, characterized in that, In step S6, perform temperature compensation adjustment on the floating charge voltage after capacity compensation adjustment through the following formula: V fmax = V soc - 0.003·N Among them, V soc represents the floating charge voltage after capacity compensation adjustment, V fmax represents the maximum floating charge voltage allowed for the battery at the current temperature, and N represents the floating charge voltage temperature adjustment multiple.

4. A method for managing the floating charge voltage of a storage battery in a distribution network according to claim 1, characterized in that, In step S7, perform temperature compensation adjustment on the floating charge voltage of the battery according to the following formula: V fmax = V f - 0.003 N Among them, V f represents the maximum floating charge voltage allowed for the battery at the rated temperature, V fmax represents the maximum floating charge voltage allowed for the battery at the current temperature, and N represents the floating charge voltage temperature adjustment multiple.

5. The floating charge voltage management method for a distribution network energy storage battery according to claim 1, wherein, In step S2, when the battery SOC is lower than 80%, prompt that the battery needs to be replaced.

6. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method described in any one of claims 1-5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method described in any one of claims 1-5.

8. A floating charge voltage management system for a distribution network energy storage battery, which is used to execute the floating charge voltage management method for a distribution network energy storage battery as described in any one of claims 1-5, characterized in that, Including an AC / DC converter, a charging management module, a distribution network energy storage battery, an MCU, a floating charge voltage management module, a voltage and current acquisition module, a battery temperature acquisition module, and an SOC calculation module. The AC / DC converter is connected to the distribution network AC bus and is used to convert alternating current into direct current. Both the distribution network energy storage battery and the AC / DC converter are connected to the charging management module. The distribution network energy storage battery is connected to the floating charge voltage management module. The charging management module is used for controlling the charging method of the battery and monitoring the charging voltage and current. The voltage and current acquisition module, the battery temperature acquisition module, and the SOC calculation module are all connected to the MCU. The voltage and current acquisition module is used to acquire the voltage and current of the distribution network energy storage battery under the charging state. The battery temperature acquisition module is used to acquire the surface temperature of the distribution network energy storage battery under the charging state. The SOC calculation module is used to calculate the battery SOC. The MCU is connected to the floating charge voltage management module. The MCU is used to perform logical processing on the data and output a control signal to the floating charge voltage management module. The floating charge voltage management module is used to adjust the magnitude of the output floating charge voltage.

9. The floating charge voltage management system for a distribution network energy storage battery according to claim 8, characterized in that, The floating charge voltage management module realizes the adjustment of the floating charge voltage by adjusting the duty cycle of the switching tube of the DC-DC.

10. A floating charge voltage management system for a distribution network energy storage battery as claimed in claim 8, characterized in that, The battery temperature acquisition module is a temperature sensor.

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