CN112993972B - Backup power energy storage method and system, control equipment and storage medium - Google Patents
Backup power energy storage method and system, control equipment and storage medium Download PDFInfo
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- CN112993972B CN112993972B CN202110537589.9A CN202110537589A CN112993972B CN 112993972 B CN112993972 B CN 112993972B CN 202110537589 A CN202110537589 A CN 202110537589A CN 112993972 B CN112993972 B CN 112993972B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a standby power energy storage method, a standby power energy storage system, control equipment and a storage medium, which are applied to a power supply system for supplying power to a direct current load, wherein the power supply system comprises a lead-acid battery pack, a lithium iron phosphate battery pack and a power module which are connected to a power utilization end of the direct current load in parallel, and the method comprises the following steps: when an energy storage instruction is obtained and a first preset condition is met, enabling the power supply module to supply power to the direct-current load and charge the lithium iron phosphate battery pack; when a discharge instruction is obtained and a second preset condition is met, enabling the lithium iron phosphate battery pack to supply power to the direct-current load; when the energy storage instruction and the discharge instruction are not obtained, the power supply module is enabled to supply power to the direct current load; and when the alternating current input end of the power supply module is powered off and meets a third preset condition, the lead-acid battery pack supplies power to the direct current load. The invention can effectively solve the problem of compatibility of energy storage and standby power, so that the standby power energy storage is more practical.
Description
Technical Field
The present invention relates to the field of communication base stations, and more particularly, to a method, a system, a control device, and a storage medium for storing energy for standby power.
Background
Mobile communication base stations are important infrastructure in modern communication networks, and in order to ensure the reliability of the communication networks, a huge number of base stations are required. The statistical data of 2020 shows that the total number of nationwide mobile communication base stations is 931 ten thousand, the total number of the mobile communication base stations is increased by 90 thousand all the year round, wherein the total number of the 4G base stations is 575 ten thousand, and the deep coverage is realized in the town areas; with the arrival of the 5G era, more than 71.8 ten thousand 5G base stations have been opened by the end of 2020.
In a backup power supply system of a base station, a group of DC 48V lead-acid storage batteries are mainly used as backup batteries (a larger base station is provided with two or more groups of storage batteries with the same specification and model in parallel). Because the battery is used as a backup power supply, the backup battery is in an idle floating charge state for a long time, effective charging and discharging activation cannot be obtained, the sulfation phenomenon of the storage battery is very serious, the service life of the storage battery of the base station is shortened, and the endurance capacity does not reach the standard.
In addition, the energy can be stored through the base station standby battery in consideration of the number of the base stations and the standby capacity. However, most base station batteries have insufficient actual endurance, and have limited capacity to discharge electricity in practice on the premise of ensuring the most basic spare capacity or endurance of communication. Even if a certain depth of discharge is set, for example, a 40% capacity is left, the discharge efficiency is lower than the average level at the end voltage level of the capacity due to the characteristics of the battery itself, and the 40% capacity does not actually work when the battery is discharged to the cutoff capacity or ac power failure, and there is a safety risk of electricity consumption.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, a system, a control device and a storage medium for storing energy for backup power, aiming at the problems that the backup battery of the communication base station is easy to age, the discharged power is limited when used for storing power, and the power consumption of the base station may be affected.
The technical scheme for solving the technical problems is that the invention provides a standby power energy storage method, which is applied to a power supply system for supplying power to a direct current load, wherein the power supply system comprises a lead-acid battery pack, a lithium iron phosphate battery pack and a power supply module, a direct current output end of the power supply module, a voltage output end of the lithium iron phosphate battery pack and a voltage output end of the lead-acid battery pack are respectively and electrically connected to a power utilization end of the direct current load, and the lithium iron phosphate battery pack and the lead-acid battery pack have the same nominal voltage; the method comprises the following steps:
when an energy storage instruction is obtained and a first preset condition is met, controlling a direct current output end of the power supply module to output a first voltage, so that the power supply module supplies power to the direct current load and charges the lithium iron phosphate battery pack;
when a discharge instruction is obtained and a second preset condition is met, controlling a direct current output end of the power supply module to output a second voltage, so that the lithium iron phosphate battery pack supplies power to the direct current load;
when the energy storage instruction and the discharge instruction are not obtained, controlling a direct current output end of the power supply module to output a third voltage so that the power supply module supplies power to the direct current load;
and when the alternating current input end of the power supply module is powered off and meets a third preset condition, the lead-acid battery pack supplies power to the direct current load.
As a further improvement of the present invention, the voltage output terminal of the lead-acid battery pack is connected to the power consumption terminal of the dc load via a switching unit, and the method further includes:
when the energy storage instruction is obtained and meets a first preset condition, the discharging instruction is obtained and meets a second preset condition, and the energy storage instruction and the discharging instruction are not obtained, the switching unit is controlled to be switched off;
and when the alternating current input end of the power supply module is powered off and meets a third preset condition, controlling the switch unit to be switched on.
As a further improvement of the present invention, a float charge voltage lower limit value of the lithium iron phosphate battery pack is within a float charge interval range of the lead-acid battery pack, and the first voltage is not lower than the float charge voltage of the lithium iron phosphate battery pack; the second voltage is lower than the nominal voltage of the lithium iron phosphate battery pack; the third voltage is higher than the nominal voltage of the lithium iron phosphate battery pack and lower than the float charge voltage of the lithium iron phosphate battery pack;
the first preset condition includes: the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage, the temperature of the lithium iron phosphate battery pack is not higher than 40 ℃, the voltage of the lead-acid battery pack is not lower than the nominal voltage, the temperature of a single battery in the lead-acid battery pack is not higher than 40 ℃, the internal resistance of the lead-acid battery pack is not higher than 50% of the nominal internal resistance, and the voltage of the single battery in the lead-acid battery pack is not lower than 99% of the nominal voltage;
the second preset condition includes: the temperature of the lithium iron phosphate battery pack is not more than 40 ℃, and the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage thereof;
the third preset condition includes: the temperature of the single battery in the lead-acid battery pack is not more than 40 ℃, and the internal resistance of the lead-acid battery pack is not more than 50% of the nominal internal resistance.
As a further improvement of the present invention, the controlling the dc output terminal of the power module to output a first voltage to enable the power module to supply power to the dc load and charge the lithium iron phosphate battery pack includes:
and when the voltage of the lead-acid battery pack is lower than the nominal voltage of the lead-acid battery pack, controlling the switch unit to be switched on, enabling the power module to supply power to the direct-current load, charge the lithium iron phosphate battery pack and charge the lead-acid battery pack, and switching off the switch unit when the voltage of the lead-acid battery pack reaches 1.28 times of the nominal voltage of the lead-acid battery pack or the voltage of a single battery in the lead-acid battery pack reaches 1.2 times of the nominal voltage of the lead-acid battery pack.
The invention also provides a standby power energy storage system which is used for supplying power to a direct current load on a direct current bus and comprises a lead-acid battery pack, a lithium iron phosphate battery pack, a main controller and a power module, wherein the direct current output end of the power module, the voltage output end of the lithium iron phosphate battery pack and the voltage output end of the lead-acid battery pack are respectively and electrically connected to the power utilization end of the direct current load, and the lithium iron phosphate battery pack and the lead-acid battery pack have the same nominal voltage;
the power supply module adjusts the voltage of a direct current output end according to a control signal from the main controller, and when the main controller obtains an energy storage instruction and meets a first preset condition, the direct current output end of the power supply module is controlled to output a first voltage, so that the power supply module supplies power to the direct current load and charges the lithium iron phosphate battery pack; when a discharge instruction is obtained and a second preset condition is met, controlling a direct current output end of the power supply module to output a second voltage, so that the lithium iron phosphate battery pack supplies power to the direct current load; when the energy storage instruction and the discharge instruction are not obtained, controlling a direct current output end of the power supply module to output a third voltage so that the power supply module supplies power to the direct current load; and when the alternating current input end of the power supply module is powered off and meets a third preset condition, the lead-acid battery pack supplies power to the direct current load.
As a further improvement of the invention, the voltage output end of the lead-acid battery pack is connected with the power utilization end of the direct-current load via a switch unit;
the switching unit is switched on or off according to a control signal from the main controller, and the main controller obtains an energy storage instruction and meets a first preset condition, obtains a discharge instruction and meets a second preset condition, and controls the switching unit to be switched off when the energy storage instruction and the discharge instruction are not obtained; and controlling the switch unit to be conducted when the alternating current input end of the power supply module is powered off and meets a third preset condition.
As a further improvement of the present invention, a float charge voltage lower limit value of the lithium iron phosphate battery pack is within a float charge interval range of the lead-acid battery pack, and the first voltage is not lower than the float charge voltage of the lithium iron phosphate battery pack; the second voltage is lower than the nominal voltage of the lithium iron phosphate battery pack; the third voltage is higher than the nominal voltage of the lithium iron phosphate battery pack and lower than the float charge voltage of the lithium iron phosphate battery pack;
the first preset condition includes: the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage, the temperature of the lithium iron phosphate battery pack is not higher than 40 ℃, the voltage of the lead-acid battery pack is not lower than the nominal voltage, the temperature of a single battery in the lead-acid battery pack is not higher than 40 ℃, the internal resistance of the lead-acid battery pack is not higher than 50% of the nominal internal resistance, and the voltage of the single battery in the lead-acid battery pack is not lower than 99% of the nominal voltage;
the second preset condition includes: the temperature of the lithium iron phosphate battery pack is not more than 40 ℃, and the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage thereof;
the third preset condition includes: the temperature of the single battery in the lead-acid battery pack is not more than 40 ℃, and the internal resistance of the lead-acid battery pack is not more than 50% of the nominal internal resistance.
As a further improvement of the present invention, in the process that the power module supplies power to the dc load and charges the lithium iron phosphate battery pack, if the voltage of the lead-acid battery pack is lower than the nominal voltage, the main controller controls the switching unit to be turned on, so that the power module supplies power to the dc load, charges the lithium iron phosphate battery pack, and charges the lead-acid battery pack, and the main controller turns off the switching unit when the voltage of the lead-acid battery pack reaches 1.28 times of the nominal voltage or when the voltage of a single battery in the lead-acid battery pack reaches 1.2 times of the nominal voltage.
The invention also provides a control device, which comprises a memory and a processor, wherein the memory stores a computer program executable in the processor, and the processor executes the computer program to realize the steps of the electricity-standby energy storage method.
The present invention also provides a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the steps of the power backup energy storage method as described above.
According to the standby power energy storage method, the system, the control equipment and the storage medium, the lithium iron phosphate battery pack and the lead-acid battery pack are connected in parallel to form the standby power supply, and the lithium iron phosphate battery pack is used for carrying out circulating energy storage, so that the problem of compatibility between energy storage and standby power is effectively solved, and the standby power energy storage is more practical.
In addition, the access switch unit is additionally arranged between the lead-acid battery pack and the direct-current bus, and the access switch unit is controlled by the main controller, so that the lead-acid battery pack is powered off and periodically supplemented, the floating charge state of the traditional lead-acid battery pack is changed, the sulfation phenomenon easily generated in the floating charge state of the traditional lead-acid battery pack is favorably changed, the activation and the capacity maintenance of the lead-acid battery pack are favorably realized, and the aging speed is further delayed.
Drawings
Fig. 1 is a schematic flow chart of a backup energy storage method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of on-off control of a switch unit in the standby power energy storage method according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a backup energy storage system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a switch unit control in the backup energy storage system according to the embodiment of the invention;
fig. 5 is a schematic diagram of another switching unit control in the backup energy storage system according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic flow chart of a power backup energy storage method according to an embodiment of the present invention, where the power backup energy storage method is applicable to a communication base station (e.g., a 5G communication base station, a 4G communication base station), a server station, and the like that have a dc load (e.g., a communication device load) and require a highly reliable power supply system using a backup power source.
The system for supplying power to the direct-current load by using the standby power energy storage method of the embodiment comprises a lead-acid battery pack, a lithium iron phosphate battery pack and a power module, wherein a direct-current output end of the power module, a voltage output end of the lithium iron phosphate battery pack and a voltage output end of the lead-acid battery pack are respectively and electrically connected to a power utilization end of the direct-current load. The above lithium iron phosphate battery pack has the same nominal voltage (for example, DC 48V) as the lead-acid battery pack, and the float charge voltage lower limit of the lithium iron phosphate battery pack is within the float charge interval range of the lead-acid battery pack. The alternating current end of the power supply module is connected with a power grid, the direct current output ends (positive and negative) are electrically connected with the wiring ends (positive and negative) of the direct current load through the direct current bus, the power supply module comprises a rectifying circuit, and alternating current voltage at the alternating current end is converted into direct current voltage and then is output through the direct current output end. The lithium iron phosphate battery pack can specifically adopt a lithium iron phosphate battery, and the lead-acid battery pack can adopt a valve-controlled lead-acid battery. In order to meet the requirement that the lithium iron phosphate battery pack and the lead-acid battery pack are connected in parallel under the output voltage platform of the same power module, the lower limit value of the floating charge voltage of the lithium iron phosphate battery pack needs to be just in the floating charge interval range of the lead-acid battery pack, for example, when the nominal voltage of the lead-acid battery pack is 48V, the lower limit value of the floating charge voltage of the lithium iron phosphate battery pack does not exceed the limit value of 54.5V; and the lowest uniform charging voltage of the lithium iron phosphate battery pack is just close to the upper limit voltage of the uniform charging voltage of the lead-acid battery pack and does not exceed 0.4V error. In addition, the state of health SOH of the lithium iron phosphate battery pack must be maintained at 80% or more, and the state of health SOH of the lead-acid battery pack must be maintained at 60% or more.
Specifically, the lithium battery pack can be composed of a plurality of iron phosphate lithium battery cells with a nominal voltage of 3.2V, and the lead-acid battery pack can be composed of a plurality of valve-controlled lead-acid battery cells with a nominal voltage of 2.0V. For example, when the nominal voltage of each of the lithium iron phosphate battery pack and the lead-acid battery pack is 48V, the lithium battery pack can be composed of 15 lithium iron phosphate battery cells, and the lead-acid battery pack can be composed of 24 valve-controlled lead-acid battery cells. According to the actual single battery number of the cells in the 48V system, theoretically, the platform voltage of the lithium iron phosphate battery pack is 51.2V, and the platform voltage of the lead-acid battery pack is 48.0V, so that the lithium iron phosphate battery pack with the high voltage platform has strong discharge capacity after the two are connected in parallel in a load environment.
The standby power energy storage method of the embodiment may be executed by an independent control device, and may also be integrated into a power module, and the method specifically includes:
step S11: when the energy storage instruction is obtained and a first preset condition is met, the direct current output end of the power supply module is controlled to output a first voltage, so that the power supply module supplies power for a direct current load and charges a lithium iron phosphate battery pack.
In one embodiment of the invention, the following parameters may be configured by the remote control platform: the energy storage and discharge time period, the energy storage and charge time period and the non-charge and non-discharge time period in the power supply system within 24 hours, and the charge and discharge output voltage level corresponding to the power supply module. And the parameters are sent to an independent control device or a power supply module and written into the corresponding memory space.
In the step, when the energy storage charging time period corresponding to the parameter is reached, an energy storage instruction is generated, and the energy storage instruction triggers and judges whether a first preset condition is met currently. The energy storage discharge time period, the energy storage charge time period and the non-charge and non-discharge time period can respectively correspond to the peak electricity price time period, the valley electricity price time period and the flat price time period of the power grid, so that the peak electricity price time period is discharged through the standby power system, the valley electricity price time period is charged for the standby power system, and other time periods are not charged and discharged, so that the electricity charge is saved, and the operation cost is reduced.
In practical applications, the power supply system may also generate a power load curve (a response curve of a power load in a certain area, which is sent to the power utilization unit by the power department through the power management system in advance) received from the external power management system, that is, the power supply system calculates a mean power according to the power load curve, and takes a time period in the power load curve, which is greater than the mean power and reaches a first threshold value, as an energy storage and discharge time period, and takes a time period in the power load curve, which is less than or equal to the mean power and reaches a second threshold value, as an energy storage and charge time period, and takes other time periods as a non-charge and non-discharge time period. The energy storage discharge time period, the energy storage charging time period and the non-charging and non-discharging time period are directly and automatically calculated according to the power load curve from the power department, so that the automatic adjustment of the power consumption peak time period and the power consumption valley time period can be realized, the power load of the power distribution network can be better matched, and meanwhile, the manual operation is reduced.
In one embodiment of the present invention, the first voltage is not lower than a float voltage of the lithium iron phosphate battery pack and not higher than an upper limit of a uniform charge voltage of the lead-acid battery pack, and. The first preset condition includes: the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage (such as DC 48V) and not higher than the upper limit value of the float charge voltage, the temperature of the lithium iron phosphate battery pack is not more than 40 ℃, the voltage of the lead-acid battery pack is not lower than the nominal voltage (such as DC 48V), the temperature of the single batteries in the lead-acid battery pack is not more than 40 ℃, the internal resistance of the lead-acid battery pack is not more than 50% of the nominal internal resistance, and the voltage of the single batteries in the lead-acid battery pack is not less than 99% of the nominal voltage.
When the first preset condition is not met, the step S11 is exited, so that the power module supplies power to the dc load, charges the lithium iron phosphate battery pack, and charges the lead-acid battery pack, or the dc output terminal of the power module is controlled to output a third voltage, so that the power module only supplies power to the dc load.
Step S12: and when the discharging instruction is obtained and a second preset condition is met, controlling the direct current output end of the power supply module to output a second voltage, so that the lithium iron phosphate battery pack supplies power for a direct current load.
In the step, when the energy storage discharge time period corresponding to the parameter is reached, a discharge instruction is generated, and whether a second preset condition is met at present is judged by triggering of the discharge instruction.
The second voltage is lower than the nominal voltage of the lithium iron phosphate battery pack, and the voltage of the direct current output end of the power supply module is lower than the nominal voltage of the lithium iron phosphate battery pack, so that the power supply module stops outputting, and the lithium iron phosphate battery pack supplies power for a direct current load. Accordingly, the second preset condition includes: the temperature of the lithium iron phosphate battery pack is not more than 40 ℃, and the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage.
When the second preset condition is not satisfied, the step S12 is exited, and the dc output terminal of the power module is controlled to output the third voltage, so that the power module supplies power to the dc load.
Step S13: and when the energy storage instruction and the discharge instruction are not obtained, controlling the direct current output end of the power supply module to output a third voltage, so that the power supply module only supplies power for the direct current load.
The third voltage is higher than the nominal voltage of the lithium iron phosphate battery pack and lower than the float charge voltage lower limit value of the lithium iron phosphate battery pack. In the process, the voltage of the direct current output end of the power supply module can be dynamically adjusted, so that the current of the lithium iron phosphate battery pack is within +/-1A, and the lithium iron phosphate battery pack is prevented from supplying power for a direct current load.
Step S14: and when the alternating current input end of the power supply module is powered off (namely, the power grid is powered off) and a third preset condition is met, the lead-acid battery pack supplies power to the direct current load. In this process, the lithium iron phosphate battery pack can simultaneously supply power to the dc load.
The third preset condition includes: the temperature of the single battery in the lead-acid battery pack is not more than 40 ℃, and the internal resistance of the lead-acid battery pack is not more than 50% of the nominal internal resistance.
In the power supply process, the above steps S11-S14 are alternately performed or intermittently performed according to the time period and the preset condition.
According to the power backup energy storage method, the lithium iron phosphate battery pack and the lead-acid battery pack are connected in parallel to be used as power backup, and the output voltage of the power supply module is controlled to carry out charging and discharging control on the power backup, so that the cycle times of the lithium iron phosphate battery pack in the service life cycle can be effectively utilized to exceed that of the lead-acid battery pack, and the characteristics of the lithium iron phosphate battery pack, such as high charging and discharging response speed and high discharging efficiency, are adopted, and the reliability of direct-current load power supply is ensured while the power backup and peak shifting energy storage is realized.
According to the standby power energy storage method, the lithium iron phosphate battery pack (lithium iron phosphate battery) can be connected to be used as energy storage under the condition that the existing lead-acid battery pack (lead-acid battery) of the base station is reserved, and the original lead-acid battery pack continuously plays a role in standby power utilization. Compared with the traditional online floating charge of the storage battery, the charging and discharging energy with a certain periodic frequency promotes the activation of the lead-acid battery, prevents the sulfation of the lead-acid battery pack under the long-term floating charge condition, effectively prevents the aging and the failure of the battery, and solves the problem that the real energy storage effect can be realized on the premise that the power supply system of the base station guarantees the safety of the standby power.
In one embodiment of the present invention, a switching unit may be added between the voltage output terminal of the lead-acid battery pack and the dc load (dc bus), i.e. the voltage output terminal of the lead-acid battery pack is connected to the power consumption terminal of the dc load via the switching unit. Correspondingly, as described in conjunction with fig. 2, the above-mentioned backup energy storage method further includes:
step S15 is to control the switch unit to be turned off when the energy storage command is obtained and meets the first preset condition, when the discharge command is obtained and meets the second preset condition, and when the energy storage command and the discharge command are not obtained, that is, the lead-acid battery pack is in an off-line state to wait for standby.
Step S16: and when the alternating current input end of the power supply module is powered off and meets a third preset condition, the switch unit is controlled to be switched on. When the power grid is powered off, the switch unit is switched on, and the lead-acid battery pack is connected to the direct-current bus to provide electric energy for the direct-current load.
The lithium iron phosphate battery pack is connected to the direct-current bus in a communicated state, the lead-acid battery pack is connected with the direct-current bus through the switch unit, and the switch unit is in a normally open state, so that the lead-acid battery pack is in an off-line state. During normal peak shifting energy storage, because the lithium iron phosphate battery pack is directly communicated with the direct current bus, the energy storage effect is achieved, and the storage battery is always off-line for standby. When the alternating current is in power failure, the control switch unit enables the lead-acid battery pack to be connected to the bus to provide electric energy. The method is beneficial to changing the sulfation phenomenon easily generated in the floating charging state of the traditional storage battery, and is beneficial to the activation and capacity maintenance of the lead-acid battery pack, thereby delaying the aging speed.
Specifically, when the voltage of the lead-acid battery pack is lower than the nominal voltage thereof in step S11, the switch unit is controlled to be turned on, so that the power module supplies power to the dc load, charges the lithium iron phosphate battery pack, and charges the lead-acid battery pack, and the switch unit is turned off when the voltage of the lead-acid battery pack reaches 1.28 times of the nominal voltage thereof or the voltage of the single battery in the lead-acid battery pack reaches 1.2 times of the nominal voltage thereof, thereby completing the power supplement of the lead-acid battery pack.
In addition, the standby power storage method of the invention can also comprise a battery alarm step, for example, an alarm signal is output when any one of the following conditions occurs: the temperature of the lithium battery and the storage battery is higher than 40 ℃; the voltage of the lithium iron phosphate battery pack is instantly reduced to below 48V after the voltage starts to discharge; the electricity of a single storage battery in the lead-acid battery pack is lower than 1.98V (the nominal voltage of the single storage battery is 2V); the voltage of a monomer storage battery in the lead-acid battery pack is instantaneously decompressed to be below 1.5V; and the alternating current is cut off.
Fig. 3 to 5 are schematic diagrams of a power backup energy storage system according to an embodiment of the present invention, which can be used for power supply control of a communication base station, particularly a 5G communication base station. The standby power energy storage system of this embodiment includes a main controller 31, a power module 32, a lead-acid battery pack 34, and a lithium iron phosphate battery pack 33, wherein a dc output terminal of the power module 32, a voltage output terminal of the lithium iron phosphate battery pack 33, and a voltage output terminal of the lead-acid battery pack 34 are electrically connected to a power utilization terminal of a dc load 38 (for example, via a dc bus), respectively, and the lithium iron phosphate battery pack 33 and the lead-acid battery pack 34 have the same nominal voltage.
The ac terminal of the power module 32 is connected to a power grid, and the power module 32 includes a rectifier circuit, and converts the ac voltage at the ac terminal into a dc voltage and outputs the dc voltage through a dc output terminal. The lithium battery 33 may be a lithium iron phosphate battery, and the lead-acid battery 34 may be a valve-regulated lead-acid battery. In order to meet the requirement that the lithium iron phosphate battery pack 33 and the lead-acid battery pack 34 are connected in parallel under the output voltage platform of the same power module 32, the lower limit value of the float charge voltage of the lithium iron phosphate battery pack 33 is required to be just within the range of the float charge interval of the lead-acid battery pack 34, for example, when the nominal voltage of the lead-acid battery pack 34 is 48V, the lower limit value of the float charge voltage of the lithium iron phosphate battery pack 33 is not more than 54.5V; and the lowest average charging voltage of the lithium iron phosphate battery pack 33 is just close to the upper limit voltage of the average charging voltage of the lead-acid battery pack 34 and does not exceed 0.4V error. Further, the state of health SOH of the lithium iron phosphate battery 33 must be maintained at 80% or more, and the state of health SOH of the lead-acid battery 34 must be maintained at 60% or more.
The power module 34 adjusts the voltage of the dc output terminal according to the control signal from the main controller 31, and when the main controller 31 obtains the energy storage instruction and meets the first preset condition, the dc output terminal of the power module 32 is controlled to output the first voltage, so that the power module 32 supplies power to the dc load 34 and charges the lithium iron phosphate battery pack 33; when the discharging instruction is obtained and a second preset condition is met, controlling the direct-current output end of the power module 32 to output a second voltage, so that the lithium iron phosphate battery pack 33 supplies power to the direct-current load 38; when the energy storage instruction and the discharge instruction are not obtained, controlling the direct current output end of the power supply module 32 to output a third voltage, so that the power supply module 32 supplies power for the direct current load; when the ac input terminal of the power module 32 is powered off and meets the third preset condition, the lead-acid battery pack 33 is made to supply power to the dc load.
In one embodiment of the present invention, the following parameters may be configured for the main controller 31 via the remote control platform: the parameters of the energy storage and discharge time period, the energy storage and charge time period, the non-charge and non-discharge time period in the power supply system within 24 hours and the charge and discharge output voltage level corresponding to the power module are written into the corresponding memory space by the main controller 31. When the energy storage charging time period corresponding to the parameter is reached, the main controller 31 generates an energy storage instruction, and the energy storage instruction triggers and judges whether a first preset condition is met currently; when the energy storage and discharge time period corresponding to the parameters is reached, the main controller 31 generates a discharge instruction, and the discharge instruction triggers and judges whether a second preset condition is met currently; when the time period of non-charging and non-discharging corresponding to the parameter is reached, the main controller 31 does not generate the energy storage command and the discharging command.
Furthermore, the voltage output of the lead-acid battery 34 can be connected to the load of the dc load 38 via the switching unit 35. That is, the negative pole of the lead-acid battery 34 is connected to the negative dc bus via the switch unit 35 and the fuse FU1, and the positive pole of the lead-acid battery 34 is directly connected to the positive dc bus via the fuse FU 2. The lithium iron phosphate battery pack 33 is directly connected to the positive and negative direct current buses through the fuse. The switch unit 35 is turned on or off according to a control signal from the main controller 31, and the main controller 31 controls the switch unit 35 to be turned off when acquiring the energy storage instruction and satisfying a first preset condition, when acquiring the discharge instruction and satisfying a second preset condition, and when not acquiring the energy storage instruction and the discharge instruction; when the ac input terminal of the power module 32 is powered off and a third preset condition is met, the switch unit 35 is controlled to be turned on.
In the process that the power module supplies power for the direct-current load and charges the lithium iron phosphate battery pack, if the voltage of the lead-acid battery pack is lower than the nominal voltage, the main controller 31 controls the switch unit 35 to be switched on, so that the power module supplies power for the direct-current load, charges the lithium iron phosphate battery pack and charges the lead-acid battery pack, and the main controller 31 switches off the switch unit 35 when the voltage of the lead-acid battery pack 34 reaches 1.28 times of the nominal voltage or the voltage of a single battery in the lead-acid battery pack 34 reaches 1.2 times of the nominal voltage, so that the lead-acid battery pack 34 is supplied with power.
And, the first voltage is not lower than the float charge voltage of the lithium iron phosphate battery pack 33; the second voltage is lower than the nominal voltage of the lithium battery 33 pack; the third voltage is higher than the nominal voltage of the lithium iron phosphate battery 33 and lower than the float voltage of the lithium iron phosphate battery 33. Accordingly, the first preset condition includes: the voltage of the lithium iron phosphate battery pack 33 is not lower than the nominal voltage, the temperature of the lithium iron phosphate battery pack 33 is not higher than 40 ℃, the voltage of the lead-acid battery pack 34 is not lower than the nominal voltage, the temperature of the single battery in the lead-acid battery pack 34 is not higher than 40 ℃, the internal resistance of the lead-acid battery pack 34 is not higher than 50% of the nominal internal resistance, and the voltage of the single battery in the lead-acid battery pack 34 is not lower than 99% of the nominal voltage; the second preset condition includes: the temperature of the lithium iron phosphate battery pack 33 is not more than 40 ℃, and the voltage of the lithium iron phosphate battery pack 33 is not lower than the nominal voltage thereof; the third preset condition includes: the temperature of the individual cells in the lead-acid battery pack 34 does not exceed 40 ℃, and the internal resistance of the lead-acid battery pack 34 does not exceed 50% of its nominal internal resistance.
In an embodiment of the present invention, the main controller 31 may be based on an ARM 11 core, and has three paths of serial communication interfaces, one path of power supply/total voltage/power line carrier communication multiplexing interface, one path of ethernet interface, one 4G/5G communication module, one hall current sensor DB9 interface, and two paths of switching value input and output interfaces.
Specifically, in the three-way serial port communication interface of the main controller 31, the first RS232/485 serial port is used for communicating with the power module 32, so that the main controller 31 can send a control instruction to the power module 32 and read voltage and current information of the power module; the second path is used for communicating with the switch unit 35, specifically, the switch unit 35 can adopt an RS485 intelligent switch, and the online or offline function of the lead-acid battery pack 34 is realized through the control of the main controller; the third path is used for data communication with the lithium iron phosphate battery pack 33 to read battery state data of the lithium iron phosphate battery pack 33, including voltage, current, temperature, and the like.
The power supply/total voltage/power line carrier communication multiplexing interface is a 2-pin direct-current power supply interface with a switch, and a controller power supply module, a total voltage acquisition channel and a power line carrier communication module channel in the main controller 31 are all converged at the multiplexing interface through an isolation circuit. To the outside, the positive power line of the power/total voltage/power line carrier communication multiplexing interface is connected to the total positive electrode of the lead-acid battery pack 34, and the negative power line is connected to the total negative electrode of the lead-acid battery pack 34, so as to obtain the power supply voltage from the lead-acid battery pack 34. Meanwhile, the power supply/total voltage/power line carrier communication multiplexing interface is also a monitoring and collecting interface of the main controller 31 for the voltage of the lead-acid battery pack 34 and a PLC communication interface for data communication with the monitoring terminal 36 of the lead-acid battery pack 34.
The 4G/5G communication module is used for realizing data interaction between the main controller 31 and the cloud data server in a 4G/5G mode. The Ethernet interface belongs to an expansion communication interface and is used for being interconnected with a local network and interacting data to a local data server or a cloud data server.
The hall current sensor DB9 interface is directly connected to the hall sensor 37, and the hall sensor 37 is installed at any end of the dc inlet/outlet line of the lead-acid battery pack 34, so that it is ensured that the discharging current direction of the lead-acid battery pack 34 is consistent with the arrow direction of the hall sensor housing identification, thereby realizing the discharging current monitoring of the lead-acid battery pack 34.
The two switching value input/output ports are used for connecting the switching unit 35, in this case, a direct current contactor or a controllable switch mainly including an electric operating mechanism which can be used by the switching unit 35 is used, one switching value output port is connected to a driving power supply of the controllable switch and used for driving the switch to be closed or opened, and the other switching value input interface is connected to an auxiliary contact of the controllable switch and used for monitoring the on-off state of the switch.
The monitoring terminal 36 can be formed by a chip based on an embedded STM32F1 chip core, and comprises a power line carrier communication (PLC) module circuit, two terminal positive and negative power line interfaces for power supply/PLC communication/voltage test line multiplexing, 5 pure battery test lines and 6 digital temperature sensor channels. For example, when the storage battery is composed of 24 single batteries of 2V, the monitoring terminal 36 may include 4 monitoring units, each 6 single batteries are monitored by one monitoring unit, the terminal power supply of each monitoring unit is 12V and is respectively connected to the positive electrode and the negative electrode of the corresponding 6 single batteries, and the remaining 5 test lines are sequentially connected to the connection strips between the storage batteries to measure the voltage and the internal resistance of the single batteries. 6 digital sensor probes led out from the 6 paths of digital temperature sensor channels are fixed on the anode or the cathode of each single battery in sequence to measure the pole temperature of the single battery. Each monitoring unit sends the state data of the six single batteries of the group to the main controller 31 through the power lines of the monitoring terminals and the connecting strips in the lead-acid battery pack, and the main controller 31 receives a whole group of data and then transmits the data to a remote data server or a cloud server through 4G/5G communication or Ethernet.
Referring to fig. 4-5, the switch unit 35 may be a controllable switch including an RS485 intelligent switch, a dual-contact dc contactor, or an electric operating mechanism according to different internal switch elements, and the access switch is turned off and the lead-acid battery pack is turned off in the energy storage state. The non-energy storage state, the open/close state of the switch access unit is controlled by the main controller 31 according to the setting. As shown in fig. 4, the switch unit 35 adopts a switch unit including an RS485 intelligent switch, the RS485 intelligent switch is connected between a negative cable of the lead-acid battery pack 34 and the negative dc bus in a penetrating manner, that is, the negative cable of the lead-acid battery pack 34 is connected to a load end of the RS485 intelligent switch, and the other end of the RS485 intelligent switch is connected to the negative dc bus through a fuse FU1 by a cable; and a driving power supply of the RS485 intelligent switch is externally connected to the positive direct current bus. The positive cable wires of the lead acid battery 34 are connected directly to the positive dc bus through fuse FU 2.
In another embodiment of the invention, as shown in fig. 5, the switching unit 35 employs a controllable switch including a dc contactor or an electric operating mechanism. The external connection mode of the access switch unit is as shown in table 1 below, regardless of whether the inside is a dc contactor or an electric operating mechanism.
Table 1:
| controller | Din1 | Din2 | Do1 | Do2 |
| Switch unit | Pin1 | Pin2 | Di1 | Di2 |
In fig. 5, Vin is a positive terminal access terminal of the driving power supply of the switch unit 35, and is directly connected to the positive electrode of the lead-acid battery; pin1 and Pin2 are auxiliary contact test terminals of the switch unit 35 and are correspondingly connected to the Din1 and Din2 switching value input interfaces of the main controller 31; di1 and Di2 are control ports of the switch unit, are connected in series with the output of the drive module of the switch unit 35 and the drive coil of the controllable switch, and are externally connected with the Do1 and Do2 switching value output interfaces of the main controller 31.
In the energy storage state, the relays of the internal circuits of the switching value output interfaces Do1 and Do2 of the main controller 31 are in a normally open state, so that the controllable switch driving coils inside the switch unit 35 are not electrified, the main contacts are kept in an open state, and the lead-acid battery pack 34 is off-line. When the relay of the internal circuit of the switching value output interface of the main controller 31 is controlled to be closed, the controllable switch driving coil inside the switch unit 35 is electrified, the main contact is changed from an open state to a closed state, and the lead-acid battery pack 34 is connected to the direct-current bus.
The standby power energy storage system in this embodiment is the same as the standby power energy storage method in the embodiment corresponding to fig. 1-2, and specific implementation processes thereof are described in detail in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in this apparatus embodiment, which is not described herein again.
The embodiment of the present invention further provides a control device, such as the main controller 31 in fig. 3. The control device of the embodiment includes a memory and a processor, wherein the memory stores a computer program executable in the processor, and the processor executes the computer program to implement the steps of the power-backup energy storage method according to the embodiment of fig. 1-2.
The control device in this embodiment and the standby power energy storage method in the embodiment corresponding to fig. 1-2 belong to the same concept, and specific implementation processes thereof are detailed in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in this device embodiment, and are not described herein again.
One embodiment of the present invention provides a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform a power backup energy storage method as described above.
The computer-readable storage medium in this embodiment is the same as the standby power energy storage method in the embodiment corresponding to fig. 1-2, and specific implementation processes thereof are described in detail in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in this device embodiment, which is not described herein again.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed backup energy storage method and control device may be implemented in other manners.
All or part of the flow in the method of the embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a processor, to instruct related hardware to implement the steps of the embodiments of the methods. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any physical or interface switching device, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signal, telecommunication signal, software distribution medium, etc., capable of carrying said computer program code. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (6)
1. A standby power energy storage method is applied to a power supply system for supplying power to a direct current load, and is characterized in that the power supply system comprises a lead-acid battery pack, a lithium iron phosphate battery pack and a power supply module, wherein a direct current output end of the power supply module, a voltage output end of the lithium iron phosphate battery pack and a voltage output end of the lead-acid battery pack are respectively and electrically connected to a power utilization end of the direct current load, and the lithium iron phosphate battery pack and the lead-acid battery pack have the same nominal voltage; the method comprises the following steps:
when an energy storage instruction is obtained and a first preset condition is met, controlling a direct current output end of the power supply module to output a first voltage, so that the power supply module supplies power to the direct current load and charges the lithium iron phosphate battery pack;
when a discharge instruction is obtained and a second preset condition is met, controlling a direct current output end of the power supply module to output a second voltage, so that the lithium iron phosphate battery pack supplies power to the direct current load;
when the energy storage instruction and the discharge instruction are not obtained, controlling a direct current output end of the power supply module to output a third voltage so that the power supply module supplies power to the direct current load;
when the alternating current input end of the power supply module is powered off and meets a third preset condition, the lead-acid battery pack supplies power to the direct current load;
the voltage output end of the lead-acid battery pack is connected with the power utilization end of the direct-current load through a switch unit, and the method further comprises the following steps:
when the energy storage instruction is obtained and meets a first preset condition, the discharging instruction is obtained and meets a second preset condition, and the energy storage instruction and the discharging instruction are not obtained, the switching unit is controlled to be switched off;
when the alternating current input end of the power supply module is powered off and meets a third preset condition, controlling the switch unit to be conducted;
the floating charge voltage reduction limit value of the lithium iron phosphate battery pack is within the floating charge interval range of the lead-acid battery pack; the first voltage is not lower than the floating charge voltage of the lithium iron phosphate battery pack; the second voltage is lower than the nominal voltage of the lithium iron phosphate battery pack; the third voltage is higher than the nominal voltage of the lithium iron phosphate battery pack and lower than the float charge voltage of the lithium iron phosphate battery pack;
the first preset condition includes: the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage, the temperature of the lithium iron phosphate battery pack is not higher than 40 ℃, the voltage of the lead-acid battery pack is not lower than the nominal voltage, the temperature of a single battery in the lead-acid battery pack is not higher than 40 ℃, the internal resistance of the lead-acid battery pack is not higher than 50% of the nominal internal resistance, and the voltage of the single battery in the lead-acid battery pack is not lower than 99% of the nominal voltage;
the second preset condition includes: the temperature of the lithium iron phosphate battery pack is not more than 40 ℃, and the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage thereof;
the third preset condition includes: the temperature of the single battery in the lead-acid battery pack is not more than 40 ℃, and the internal resistance of the lead-acid battery pack is not more than 50% of the nominal internal resistance.
2. The method of claim 1, wherein the controlling the dc output of the power module to output a first voltage to enable the power module to supply power to the dc load and charge the lithium iron phosphate battery pack comprises:
and when the voltage of the lead-acid battery pack is lower than the nominal voltage of the lead-acid battery pack, controlling the switch unit to be switched on, enabling the power module to supply power to the direct-current load, charge the lithium iron phosphate battery pack and charge the lead-acid battery pack, and switching off the switch unit when the voltage of the lead-acid battery pack reaches 1.28 times of the nominal voltage of the lead-acid battery pack or the voltage of a single battery in the lead-acid battery pack reaches 1.2 times of the nominal voltage of the lead-acid battery pack.
3. A standby power energy storage system is used for supplying power to a direct current load on a direct current bus and is characterized by comprising a lead-acid battery pack, a lithium iron phosphate battery pack, a main controller and a power module, wherein the direct current output end of the power module, the voltage output end of the lithium iron phosphate battery pack and the voltage output end of the lead-acid battery pack are respectively and electrically connected to the power utilization end of the direct current load, and the lithium iron phosphate battery pack and the lead-acid battery pack have the same nominal voltage;
the power supply module adjusts the voltage of a direct current output end according to a control signal from the main controller, and when the main controller obtains an energy storage instruction and meets a first preset condition, the direct current output end of the power supply module is controlled to output a first voltage, so that the power supply module supplies power to the direct current load and charges the lithium iron phosphate battery pack; when a discharge instruction is obtained and a second preset condition is met, controlling a direct current output end of the power supply module to output a second voltage, so that the lithium iron phosphate battery pack supplies power to the direct current load; when the energy storage instruction and the discharge instruction are not obtained, controlling a direct current output end of the power supply module to output a third voltage so that the power supply module supplies power to the direct current load; when the alternating current input end of the power supply module is powered off and meets a third preset condition, the lead-acid battery pack supplies power to the direct current load;
the voltage output end of the lead-acid battery pack is connected with the power utilization end of the direct-current load through a switch unit;
the switching unit is switched on or off according to a control signal from the main controller, and the main controller obtains an energy storage instruction and meets a first preset condition, obtains a discharge instruction and meets a second preset condition, and controls the switching unit to be switched off when the energy storage instruction and the discharge instruction are not obtained; when the alternating current input end of the power supply module is powered off and meets a third preset condition, controlling the switch unit to be conducted;
the floating charge lower limit value of the lithium iron phosphate battery pack is within the floating charge interval range of the lead-acid battery pack, and the first voltage is not lower than the floating charge voltage of the lithium iron phosphate battery pack; the second voltage is lower than the nominal voltage of the lithium iron phosphate battery pack; the third voltage is higher than the nominal voltage of the lithium iron phosphate battery pack and lower than the float charge voltage of the lithium iron phosphate battery pack;
the first preset condition includes: the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage, the temperature of the lithium iron phosphate battery pack is not higher than 40 ℃, the voltage of the lead-acid battery pack is not lower than the nominal voltage, the temperature of a single battery in the lead-acid battery pack is not higher than 40 ℃, the internal resistance of the lead-acid battery pack is not higher than 50% of the nominal internal resistance, and the voltage of the single battery in the lead-acid battery pack is not lower than 99% of the nominal voltage;
the second preset condition includes: the temperature of the lithium iron phosphate battery pack is not more than 40 ℃, and the voltage of the lithium iron phosphate battery pack is not lower than the nominal voltage thereof;
the third preset condition includes: the temperature of the single battery in the lead-acid battery pack is not more than 40 ℃, and the internal resistance of the lead-acid battery pack is not more than 50% of the nominal internal resistance.
4. The backup energy storage system according to claim 3, wherein during the process of supplying power to the DC load and charging the lithium iron phosphate battery pack by the power module, if the voltage of the lead-acid battery pack is lower than its nominal voltage, the main controller controls the switch unit to be turned on, so that the power module supplies power to the DC load, charges the lithium iron phosphate battery pack and charges the lead-acid battery pack, and the main controller turns off the switch unit when the voltage of the lead-acid battery pack reaches 1.28 times its nominal voltage or when the voltage of the single battery in the lead-acid battery pack reaches 1.2 times its nominal voltage.
5. A control device comprising a memory and a processor, characterized in that the memory has stored therein a computer program executable in the processor, and that the processor implements the steps of the power backup energy storage method according to claim 1 or 2 when executing the computer program.
6. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the steps of the power backup energy storage method according to claim 1 or 2.
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