CN113452122A - Lithium iron phosphate battery direct-current power supply balancing system, method and equipment for transformer substation - Google Patents
Lithium iron phosphate battery direct-current power supply balancing system, method and equipment for transformer substation Download PDFInfo
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- CN113452122A CN113452122A CN202110832997.7A CN202110832997A CN113452122A CN 113452122 A CN113452122 A CN 113452122A CN 202110832997 A CN202110832997 A CN 202110832997A CN 113452122 A CN113452122 A CN 113452122A
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 144
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 144
- 238000007600 charging Methods 0.000 claims abstract description 102
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000004590 computer program Methods 0.000 claims description 12
- 238000010277 constant-current charging Methods 0.000 claims description 8
- 230000008439 repair process Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000003860 storage Methods 0.000 description 10
- 238000005070 sampling Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- 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
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a system, a method and equipment for balancing a direct-current power supply of a lithium iron phosphate battery for a transformer substation, wherein the charging method comprises the following steps: acquiring terminal voltages and temperatures of all single lithium batteries in the series lithium iron phosphate battery pack; judging whether the terminal voltage exceeds a protection threshold value or not, and judging whether the temperature exceeds a preset battery temperature threshold value interval or not; if one exceeds the protection threshold value or exceeds a preset battery temperature threshold value interval, cutting off a charging loop and sending alarm information; and (3) judging the terminal voltages of all the single lithium batteries and a preset battery voltage threshold, and controlling a battery charging mode: single lithium battery B in series lithium iron phosphate battery packiWhen the terminal voltage reaches the balance threshold value, the single lithium battery B is controllediAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner. The invention effectively solves the problem of charge imbalance caused by inconsistent physical characteristics of the series lithium battery pack.
Description
Technical Field
The invention relates to the field of direct-current power supplies, in particular to a system, a method and equipment for balancing a direct-current power supply of a lithium iron phosphate battery for a transformer substation.
Background
The lithium iron phosphate battery has the comprehensive advantages of low self-discharge rate, stable voltage platform, no memory and the like, and is most suitable to be popularized and applied in a transformer substation as a storage battery for a direct-current power supply in mainstream lithium batteries for industrial application at present. Due to the limitations of power and voltage, a plurality of electric cores of the lithium iron phosphate battery are required to be connected in series for use in a substation scene, however, the difference of the capacity, the internal resistance and the self-discharge rate of the lithium battery is easy to cause the difference of the battery capacity, and because of the existence of the barrel effect, the effective capacity of the whole battery pack depends on the single battery with the minimum capacity.
For a lead-acid storage battery type direct-current power supply, in consideration of the charge-discharge characteristics, safety, technical economy and operation and maintenance method of a lead-acid battery, no corresponding balancing device or system exists in the application process of a transformer substation, and therefore a new problem is introduced in the process of replacing the lead-acid with a lithium battery; the lead-acid storage battery in the direct-current power supply of the transformer substation cannot be directly replaced by the lithium battery.
Disclosure of Invention
The invention aims to provide a system, a method and equipment for balancing a direct-current power supply of a lithium iron phosphate battery for a transformer substation, so as to solve the problem of unbalanced charging caused by inconsistent physical characteristics of series lithium battery packs. The invention can monitor the working state of the series lithium battery pack, cut off the main loop in time when abnormal state occurs, and send out prompt information, thereby avoiding the occurrence of safety accidents and improving the overall reliability of the system.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for equalizing charge of a direct-current power supply of a lithium iron phosphate battery for a transformer substation, which comprises the following steps:
acquiring terminal voltage and temperature of a single lithium battery in a series lithium iron phosphate battery pack;
judging whether the terminal voltage of the single lithium battery exceeds a protection threshold value and whether the temperature of the single lithium battery exceeds a preset battery temperature threshold value interval; if the terminal voltage of one single lithium battery exceeds a protection threshold value, or the temperature of one single lithium battery exceeds a preset battery temperature threshold value interval, cutting off a charging loop;
judging the terminal voltage of all single lithium batteries and a preset battery voltage threshold value, and when the single lithium battery B is connected in series with the lithium iron phosphate battery packiWhen the terminal voltage of the transformer reaches the equilibrium threshold value, the controlManufacture of single lithium battery BiAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner.
The invention further improves the following steps: in the step of judging whether the terminal voltages of all the single lithium batteries exceed a protection threshold value and judging whether the temperatures of all the single lithium batteries exceed a preset battery temperature threshold value interval, the protection threshold value is 3.7V; the preset temperature threshold interval of the battery is-10-55 ℃.
The invention further improves the following steps: the step of judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold specifically comprises the following steps:
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery;
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value;
and when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode.
The invention further improves the following steps: and in the step of judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold value and controlling the battery charging mode, the first threshold value is 2.7V, and the second threshold value is 3.6V.
The invention further improves the following steps: and in the step of judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold value and controlling the battery charging mode, the equalizing threshold value is 3.65V.
The invention further improves the following steps: the control single lithium battery BiIn the step of releasing the redundant electric energy in the form of ohmic heat, the single lithium battery B is controllediCorresponding equalizing discharge loop HiControl switch of (2) closed, single-sectionLithium battery BiExcess electrical energy is released in the form of ohmic heat.
In a second aspect, the present invention provides a dc power supply balancing system for a lithium iron phosphate battery for a transformer substation, including:
the acquisition module is used for acquiring the terminal voltage and the temperature of a single lithium battery in the series lithium iron phosphate battery pack;
the judging module is used for judging whether the terminal voltage of the single lithium battery exceeds a protection threshold value and whether the temperature of the single lithium battery exceeds a preset battery temperature threshold value interval; if the terminal voltage of one single lithium battery exceeds a protection threshold value, or the temperature of one single lithium battery exceeds a preset battery temperature threshold value interval, cutting off a charging loop;
the equalizing module is used for judging the terminal voltage of all the single lithium batteries and presetting a battery voltage threshold value, and controlling a battery charging mode: single lithium battery B in series lithium iron phosphate battery packiWhen the terminal voltage reaches the balance threshold value, the single lithium battery B is controllediAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner.
The invention further improves the following steps: the protection threshold is 3.7V; presetting a battery temperature threshold interval to be-10-55 ℃; the equalization threshold is 3.65V.
The invention further improves the following steps: the balancing module is used for judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold, and specifically comprises the following steps:
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery;
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value;
and when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode.
In a third aspect, the present invention provides a dc power supply balancing system for a lithium iron phosphate battery for a transformer substation, including:
the main control unit is used for acquiring the voltage and the temperature of the single lithium battery;
the charging control unit is used for controlling charging voltage and charging current in the charging process; the charging control unit comprises a charging control loop, a battery voltage monitoring module and a temperature monitoring module;
the input end of the charging control loop is connected with a three-phase power supply, and the output end of the charging control loop is connected with a direct-current bus and used for supplying the three-phase power supply to a branch bus after AC/DC conversion so as to charge the series lithium iron phosphate battery pack;
a temperature monitoring module for obtaining the single lithium battery B from the main control unitiThe temperature of the battery is compared with a preset battery temperature threshold interval, and when the battery is charged, a certain single lithium battery BiWhen the temperature exceeds a preset battery temperature threshold interval, controlling a charging control loop to suspend charging the series lithium iron phosphate battery pack; when the temperature of all the single lithium batteries returns to the preset battery temperature threshold interval, controlling a charging control loop to start charging;
a battery voltage monitoring module for obtaining the single lithium battery B from the main control unitiComparing the terminal voltage with a preset battery voltage threshold value: when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery; when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value; when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode; when any single lithium battery B is monitorediWhen the terminal voltage of the transformer reaches a protection threshold value, controllingClosing the charging control loop, and stopping charging the series lithium iron phosphate battery pack;
and the balanced discharge unit is used for providing an energy release channel when the voltage of the single lithium battery reaches a balanced threshold value, so that the battery is ensured not to exceed the limit voltage of the battery.
In a fourth aspect, the present invention provides an electronic device, where the electronic device includes a processor and a memory, and the processor is configured to execute a computer program stored in the memory, so as to implement the method steps of the method for equalizing charge of a dc power supply of a lithium iron phosphate battery for a substation.
Compared with the prior art, the invention has the following beneficial effects:
according to the lithium iron phosphate battery direct-current power supply equalization system for the transformer substation and the charging method thereof, terminal voltages and temperatures of all single lithium batteries in a series lithium iron phosphate battery pack are monitored in real time; the working state of the lithium iron phosphate battery pack can be monitored, whether the terminal voltage of all the single lithium batteries exceeds a protection threshold value or not is judged, whether the temperature of all the single lithium batteries exceeds a preset battery temperature threshold value interval or not is judged, if one of the terminal voltage exceeds the protection threshold value interval, an abnormal state is judged, the main loop is cut off in time, and prompt information is sent out, so that safety accidents are avoided, and the lithium iron phosphate battery pack is guaranteed to be efficiently and safely used in a transformer substation scene. Monitoring the terminal voltage of the single lithium battery, and controlling the redundant electric energy of the single lithium battery to be released in an ohmic heat mode when the terminal voltage of the single lithium battery reaches an equalization threshold value, so as to realize the equalization charging of the direct-current power supply of the lithium iron phosphate battery for the transformer substation; the problem of unbalanced charging caused by inconsistent physical characteristics of the series lithium battery pack is effectively solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a dc power supply balancing system of a lithium iron phosphate battery for a substation according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an equalizing discharge unit;
fig. 3 is a flow chart of a method for equalizing a direct-current power supply of a lithium iron phosphate battery for a substation according to a preferred embodiment of the present invention;
fig. 4 is a block diagram of a dc power supply balancing system of a lithium iron phosphate battery for a substation according to a preferred embodiment of the present invention;
fig. 5 is a block diagram of an electronic device according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example 1
Referring to fig. 1, the present invention provides a dc power source balancing system for a lithium iron phosphate battery for a transformer substation, including: the device comprises a main control unit, a battery voltage sampling unit 10, a charging control unit 20 and an equalizing discharge unit 30.
The main control unit is mainly responsible for collecting and displaying the voltage, the load current and the temperature of the single lithium battery and processing other abnormal states.
A battery voltage sampling unit 10 for collecting single lithium battery B in the series lithium iron phosphate battery pack 300iTerminal voltage, converting the collected analog signal into a digital signal and outputting the digital signal to a microprocessor; the series lithium iron phosphate battery pack comprises n single lithium batteries Bi；1≤i≤n；
A charging control unit 20 for controlling a charging voltage and a charging current during a charging process;
and the equalizing discharge unit 30 is used for providing an energy release channel when the voltage of the battery reaches a discharge threshold value, and ensuring that the battery does not exceed the limit voltage of the battery.
The main control unit comprises a microprocessor 41, a temperature measuring circuit 42 connected to the input of the microprocessor 41, a current sampling circuit 43 and an information display unit 44.
Preferably, the temperature measuring circuit 42 is a single-wire digital integrated temperature sensor for collecting each single lithium battery BiAnd output to the microprocessor.
Preferably, the current sampling circuit 43 is connected in series to the dc bus 200 by using a series current sampling resistor, and extracts voltages at two ends of the sampling resistor by using a differential amplifier, so as to obtain a load current of the lithium battery pack through calculation, and output the load current to the microprocessor. The current sampling circuit 43 is connected in series to the dc bus, and is used to monitor the current of the load and determine the current load operation state (normal/under current/short circuit). When the load is in undercurrent or short circuit (namely, exceeds a threshold value), the main loop is cut off and an alarm is given out to prompt operation and maintenance personnel to carry out maintenance.
Preferably, the information display unit 44 is an industrial serial-port touch screen liquid crystal display, and has the advantages of simple hardware connection, convenient control and rich display effect.
The charging control unit 20 includes a charging control loop, a battery voltage monitoring module, and a temperature monitoring module.
The input end of the charging control circuit is connected with a three-phase power supply, and the output end of the charging control circuit is connected with the direct-current bus 200 and used for supplying the three-phase power supply to the branch bus 200 after AC/DC conversion so as to charge the series lithium iron phosphate battery pack 300.
A temperature monitoring module for obtaining single lithium battery B from the microprocessoriThe temperature of the battery is compared with a preset battery temperature threshold interval, and when the battery is charged, a certain single lithium battery BiWhen the temperature exceeds a preset battery temperature threshold interval, controlling a charging control loop to suspend charging the series lithium iron phosphate battery pack and sending an alarm instruction; when the temperature of all the single lithium batteries returns to the preset battery temperature threshold interval, controlling a charging control loopAnd starting charging.
Preferably, the preset battery temperature threshold interval is-10 to 55 ℃.
A battery voltage monitoring module for obtaining single lithium battery B from the microprocessoriComparing the terminal voltage with a preset battery voltage threshold value to determine a charging strategy; the preset battery voltage threshold comprises a first threshold and a second threshold; wherein the first threshold is less than the second threshold. When the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery; when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value; and when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode. Preferably, the first threshold is 2.7V, the second threshold is 3.6V, and the protection threshold is 3.7V. The battery voltage monitoring module monitors any single lithium battery BiAnd when the terminal voltage reaches a protection threshold value, controlling the charging control loop to be closed, and stopping charging the series lithium iron phosphate battery pack.
Referring to FIG. 2, the equalizing discharge unit 30 includes n equalizing discharge loops, and each equalizing discharge loop HiCorresponding single lithium battery BiAnd (4) connecting in parallel. Equalizing discharge loop HiComprising a resistor RiMOS transistor MOSiAnd resistance Rmosi(ii) a Resistance RiOne end is connected with a single lithium battery BiThe other end of the anode is connected with a MOS tube MOSiThe S pole of (1); MOS tube MOSiD pole connected single lithium battery BiThe negative electrode of (1); resistance RmosiOne end connected MOSiAnd the other end of the G pole is connected with the battery voltage monitoring module. The battery voltage monitoring module in the charging control unit 20 monitors the single lithium battery BiWhen the terminal voltage reaches the equalization threshold value, the corresponding equalization discharge loop H is controllediMOS transistor MOSiThe power-on state is carried out,resistance RiAnd MOS transistor MOSiA single lithium battery B connected in series to communicate and conduct a bypassiExcess electric energy flows through the resistor RiReleased as ohmic heat. Preferably, the equalization threshold is 3.65V.
The invention provides a direct-current power supply equalization system of a lithium iron phosphate battery for a transformer substation, which mainly solves the problem of charging imbalance caused by inconsistent physical characteristics of series lithium battery packs, can monitor the working state of the lithium iron phosphate battery packs, timely cuts off a main loop when an abnormal state occurs, and sends prompt information, so that safety accidents are avoided, and efficient and safe use of the lithium iron phosphate battery packs in the scene of the transformer substation is ensured.
Example 2
Referring to fig. 3, the present invention further provides a method for equalizing charge of a dc power supply of a lithium iron phosphate battery for a transformer substation, including the following steps:
s1, collecting single lithium battery BiThe terminal voltage and temperature of;
s2, judging the single lithium battery BiWhether the terminal voltage and temperature of (2) exceed threshold values; specifically, a single lithium battery B is judgediWhether the terminal voltage exceeds a protection threshold value or not and simultaneously judging a single lithium battery BiWhether the temperature of the battery exceeds a preset battery temperature threshold interval or not; if there is one, go to step S4; otherwise, jumping to S3; preferably, the protection threshold is 3.7V; presetting a battery temperature threshold interval to be-10-55 ℃;
s3, judging the single lithium battery BiThe terminal voltage and the preset battery voltage threshold value, the battery charging mode is controlled:
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery;
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value;
when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode;
single lithium battery B in series lithium iron phosphate battery packiWhen the terminal voltage reaches the equalization threshold value, the corresponding equalization discharge loop H is controllediThe control switch is closed, and the single lithium battery BiExcess electrical energy is released in the form of ohmic heat;
and S4, cutting off the charging loop, sending alarm information, and continuously comparing the next sampling data according to the set sampling period.
Preferably, the first threshold is 2.7V and the second threshold is 3.6V; the equalization threshold is 3.65V.
Example 3
Referring to fig. 4, the present invention further provides a dc power supply balancing system for a lithium iron phosphate battery for a transformer substation, including:
the acquisition module is used for acquiring the terminal voltage and the temperature of all single lithium batteries in the series lithium iron phosphate battery pack;
the judging module is used for judging whether the terminal voltage of all the single lithium batteries exceeds a protection threshold value or not and judging whether the temperature of all the single lithium batteries exceeds a preset battery temperature threshold value interval or not; if the terminal voltage of one single lithium battery exceeds a protection threshold value or the temperature of one single lithium battery exceeds a preset battery temperature threshold value interval, cutting off a charging loop and sending alarm information;
the equalizing module is used for judging the terminal voltage of all the single lithium batteries and presetting a battery voltage threshold value, and controlling a battery charging mode: single lithium battery B in series lithium iron phosphate battery packiWhen the terminal voltage reaches the balance threshold value, the single lithium battery B is controllediAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner.
Example 4
Referring to fig. 5, the present invention further provides an electronic device 100 for a method of equalizing charging a dc power supply of a lithium iron phosphate battery for a substation; the electronic device 100 comprises a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.
The memory 101 may be configured to store the computer program 103, and the processor 102 implements the method steps of the method for equalizing charge of the lithium iron phosphate battery dc power supply for the substation in embodiment 2 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data) created according to the use of the electronic apparatus 100, and the like. In addition, the memory 101 may include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other non-volatile solid state storage device.
The at least one Processor 102 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The processor 102 may be a microprocessor or the processor 102 may be any conventional processor or the like, and the processor 102 is a control center of the electronic device 100 and connects various parts of the whole electronic device 100 by various interfaces and lines.
The memory 101 in the electronic device 100 stores a plurality of instructions to implement a method for equalizing charge of a lithium iron phosphate battery dc power supply for a substation, and the processor 102 may execute the plurality of instructions to implement:
acquiring terminal voltages and temperatures of all single lithium batteries in the series lithium iron phosphate battery pack;
judging whether the terminal voltage of all the single lithium batteries exceeds a protection threshold value or not, and judging whether the temperature of all the single lithium batteries exceeds a preset battery temperature threshold value interval or not; if the terminal voltage of one single lithium battery exceeds a protection threshold value or the temperature of one single lithium battery exceeds a preset battery temperature threshold value interval, cutting off a charging loop and sending alarm information;
and (3) judging the terminal voltages of all the single lithium batteries and a preset battery voltage threshold, and controlling a battery charging mode: single lithium battery B in series lithium iron phosphate battery packiWhen the terminal voltage reaches the balance threshold value, the single lithium battery B is controllediAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner.
Specifically, the processor 102 may refer to the description of the relevant steps in embodiment 2 for a specific implementation method of the instruction, which is not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. The equalizing charging method of the lithium iron phosphate battery direct-current power supply for the transformer substation is characterized by comprising the following steps:
acquiring terminal voltage and temperature of a single lithium battery in a series lithium iron phosphate battery pack;
judging whether the terminal voltage of the single lithium battery exceeds a protection threshold value and whether the temperature of the single lithium battery exceeds a preset battery temperature threshold value interval; if the terminal voltage of one single lithium battery exceeds a protection threshold value, or the temperature of one single lithium battery exceeds a preset battery temperature threshold value interval, cutting off a charging loop;
judging the terminal voltage of all single lithium batteries and a preset battery voltage threshold value, and when the single lithium battery B is connected in series with the lithium iron phosphate battery packiWhen the terminal voltage reaches the balance threshold value, the single lithium battery B is controllediAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner.
2. The equalizing charge method for the direct-current power supply of the lithium iron phosphate batteries for the substation according to claim 1, wherein in the step of judging whether the terminal voltages of all the single lithium batteries exceed a protection threshold value and judging whether the temperatures of all the single lithium batteries exceed a preset battery temperature threshold value interval, the protection threshold value is 3.7V; the preset temperature threshold interval of the battery is-10-55 ℃.
3. The equalizing charge method for the direct-current power supply of the lithium iron phosphate batteries for the substation according to claim 1, wherein the step of judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold specifically comprises the steps of:
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery;
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value;
and when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode.
4. The equalizing charge method for the direct-current power supply of the lithium iron phosphate batteries for the substation according to claim 3, wherein in the step of judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold value and controlling the battery charging mode, the first threshold value is 2.7V, and the second threshold value is 3.6V.
5. The equalizing charge method for the direct-current power supply of the lithium iron phosphate batteries for the substation according to claim 1, wherein in the step of judging the terminal voltages of all the single lithium batteries and the preset battery voltage threshold value and controlling the battery charging mode, the equalizing threshold value is 3.65V.
6. The equalizing charge method for the lithium iron phosphate battery direct-current power supply for the substation according to claim 1, characterized in that the single lithium battery B is controllediIn the step of releasing the redundant electric energy in the form of ohmic heat, the single lithium battery B is controllediCorresponding equalizing discharge loop HiThe control switch is closed, and the single lithium battery BiExcess electrical energy is released in the form of ohmic heat.
7. Lithium iron phosphate battery DC power supply equalizing system for transformer substation, its characterized in that includes:
the acquisition module is used for acquiring the terminal voltage and the temperature of a single lithium battery in the series lithium iron phosphate battery pack;
the judging module is used for judging whether the terminal voltage of the single lithium battery exceeds a protection threshold value and whether the temperature of the single lithium battery exceeds a preset battery temperature threshold value interval; if the terminal voltage of one single lithium battery exceeds a protection threshold value, or the temperature of one single lithium battery exceeds a preset battery temperature threshold value interval, cutting off a charging loop;
the balancing module is used for judging the terminal voltage of all the single lithium batteries and a preset battery voltage threshold value, and when the single lithium batteries B are connected in series in the lithium iron phosphate battery packiWhen the terminal voltage reaches the balance threshold value, the single lithium battery B is controllediAnd redundant electric energy is released in an ohmic heat mode, so that the direct-current power supply of the lithium iron phosphate battery for the transformer substation is charged in an equalizing manner.
8. The system for equalizing the direct-current power supply of the lithium iron phosphate batteries for the transformer substation according to claim 7, wherein the equalizing module specifically comprises, when judging the terminal voltages of all the single lithium batteries and a preset battery voltage threshold:
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold value, executing a pre-charging instruction, and controlling the battery to be charged by a low current through a charging control loop to repair the deeply discharged battery;
when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value;
and when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode.
9. Lithium iron phosphate battery DC power supply equalizing system for transformer substation, its characterized in that includes:
the main control unit is used for acquiring the voltage and the temperature of the single lithium battery;
the charging control unit is used for controlling charging voltage and charging current in the charging process; the charging control unit comprises a charging control loop, a battery voltage monitoring module and a temperature monitoring module;
the input end of the charging control loop is connected with a three-phase power supply, and the output end of the charging control loop is connected with a direct-current bus and used for supplying the three-phase power supply to a branch bus after AC/DC conversion so as to charge the series lithium iron phosphate battery pack;
a temperature monitoring module for obtaining the single lithium battery B from the main control unitiThe temperature of the battery is compared with a preset battery temperature threshold interval, and when the battery is charged, a certain single lithium battery BiWhen the temperature exceeds a preset battery temperature threshold interval, controlling a charging control loop to suspend charging the series lithium iron phosphate battery pack; when the temperature of all the single lithium batteries returns to the preset battery temperature threshold interval, controllingStarting charging of a charging control loop;
a battery voltage monitoring module for obtaining the single lithium battery B from the main control unitiComparing the terminal voltage with a preset battery voltage threshold, executing a pre-charging instruction when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is lower than a first threshold, and controlling the battery to be charged by a charging control loop to repair the deeply discharged battery; when the terminal voltage corresponding to the single lithium battery with the minimum terminal voltage in the series lithium iron phosphate battery pack is equal to or higher than a first threshold value but lower than a second threshold value, the charging control circuit controls the battery to execute constant current charging at a set current value; when the terminal voltage corresponding to the single lithium battery with the maximum terminal voltage in the series lithium iron phosphate battery pack reaches a second threshold value, the charging control loop controls the battery to be charged in a trickle mode; when any single lithium battery B is monitorediWhen the terminal voltage reaches a protection threshold value, controlling a charging control loop to be closed, and stopping charging the series lithium iron phosphate battery pack;
and the balanced discharge unit is used for providing an energy release channel when the voltage of the single lithium battery reaches a balanced threshold value, so that the battery is ensured not to exceed the limit voltage of the battery.
10. An electronic device, characterized in that the electronic device comprises a processor and a memory, the processor is configured to execute a computer program stored in the memory to implement the method steps of the method for equalizing charge of a direct-current power supply of a lithium iron phosphate battery for a substation according to any one of claims 1 to 6.
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| CN202110832997.7A CN113452122A (en) | 2021-07-22 | 2021-07-22 | Lithium iron phosphate battery direct-current power supply balancing system, method and equipment for transformer substation |
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