CN110417070A - All-vanadium redox flow battery system, based on group string all-vanadium redox flow battery system a SOC balance circuit and equalization methods - Google Patents
All-vanadium redox flow battery system, based on group string all-vanadium redox flow battery system a SOC balance circuit and equalization methods Download PDFInfo
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- CN110417070A CN110417070A CN201810403117.2A CN201810403117A CN110417070A CN 110417070 A CN110417070 A CN 110417070A CN 201810403117 A CN201810403117 A CN 201810403117A CN 110417070 A CN110417070 A CN 110417070A
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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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Abstract
All-vanadium redox flow battery system, based on a group SOC balance circuit and equalization methods for string all-vanadium redox flow battery system, belong to flow battery field, in order to solve the consistency problem of concatenated multiple single battery system state-of-charges, technical essential is that multiple battery subsystems are series in all-vanadium redox flow battery system, and it is higher than remaining battery subsystem in one of them or several battery subsystem SOC, then using the battery subsystem as the power supply of the load and investment, effect is so that electric energy, which is not only consumed, maintains each pile SOC balance, also energy is not wasted, electricity is used to drive load, realize the saving of energy.
Description
Technical field
The invention belongs to flow battery field, it is related in a kind of all-vanadium redox flow battery system and the system based on group string
SOC balance circuit and equalization methods.
Background technique
In recent years, large-scale wind power and photovoltaic are rapidly developed, but its access also brings new problem to electric system,
Energy storage technology is considered as one of the effective way solved these problems, and all-vanadium flow battery has energy storage scale big, when response
Between it is fast, safety is good, environmental-friendly, can deep discharge the advantages that, be more promising energy-storage battery.
Group string voltage or the electric current for increasing battery system are necessary to extensive all-vanadium flow battery is developed, and increase battery
System power will cause battery system cost and increase considerably, and economy reduces, therefore the group string voltage for increasing battery system is
The inevitable approach of the extensive full vanadium cell system of development.
For the group string voltage for increasing battery system, extensive all-vanadium flow battery energy-accumulating power station usually has several batteries
System is composed in series and parallel, and since pile material property is not quite identical, pile resistance characteristic is also different, is caused when series connection
When charging, occur that state-of-charge is unbalanced, and percentage of batteries subsystem overcharges between each battery subsystem, percentage of batteries subsystem is owed
It fills, when electric discharge, percentage of batteries subsystem over-discharge, and percentage of batteries subsystem is not fully discharged, due to short -board effect, causes entire
Battery system is unavailable, directly affects the service efficiency of all-vanadium flow battery.For realizing the big rule of all-vanadium redox flow battery system
Mould application, prolongs its service life, and improves economy, solves how to handle the one of concatenated multiple battery subsystem state-of-charges
Cause property problem is most important.Current solution is to have the drawback that optional equipment is more by fluid path equilibrium SOC, at
This height.Maintenance shut-downs are needed, it is complicated for operation, reduce system utilization rate.Energy loss reduces system effectiveness.
Summary of the invention
In order to solve the consistency problem of concatenated multiple battery subsystem state-of-charges, the present invention proposes following technical side
Case: a kind of based on a group SOC balance circuit for string all-vanadium redox flow battery system, including two-way power supply selecting module and all-vanadium flow electricity
The load of cell system, in the two-way power supply selecting module is battery subsystem power supply selecting module all the way, with an electricity
Pond system connection, another way is AC power source selecting module, connect with AC power source, it is described load be all exchange drive or
DC driven, power supply selecting module is used for investment power supply selection, and is handled the output of its corresponding power supply, and is exported to negative
It carries to drive the load, multiple battery subsystems are series in all-vanadium redox flow battery system, and if one of them or dry cell
System SOC is higher than remaining battery subsystem, then using the battery subsystem as the power supply of the load and investment.
As the supplement of technical solution, the load is the circulating pump of all-vanadium redox flow battery system.
As the supplement of technical solution, the power supply selecting module is respectively Switching Power Supply and DC-DC converter, electricity
The investment of source selecting module and excision are level triggers, and the Switching Power Supply is connected to AC power source, and connects in its outlet side
Diode D1 cathode is connect, the DC-DC converter is connected to pile, and connects diode D2 cathode, two poles in its outlet side
Pipe D1 and D2 common cathode, and load DC circulating pump is connected in cathode.
As the supplement of technical solution, the power supply selecting module is switching switch, spare time of the switching switch
Road and the changeable connection of inverter, inverter are connected to pile, and the preferential investment circuit of the switching switch and AC power source can
Switching connection；The connection side of switching switch and load, is connected to frequency converter, and frequency converter and load AC cycles pump connect.
As the supplement of technical solution, the power supply selecting module is respectively frequency converter and DC-DC converter, two-way
Power supply selecting module seamless switching dual power supply with frequency converter pattern switching, and DC-DC converter is connected to the direct current of frequency converter
Bus, frequency converter output are connected with load AC cycles pump.
A kind of all-vanadium redox flow battery system, including several concatenated battery subsystems and described in any item groups that are based on are gone here and there entirely
The SOC balance circuit of vanadium flow battery system.
It is a kind of based on group string all-vanadium redox flow battery system SOC balance circuit an equalization methods, each battery subsystem,
Once-through cycle pump has two-way power supply, all the way quoted from AC power source, is rectified into direct current by Switching Power Supply, Switching Power Supply investment with
Excision uses level triggers, in addition all the way quoted from the pile of battery subsystem, by DC-DC converter, battery subsystem
Pile end voltage transformation is to the available voltage value of straightway pump, and DC-DC converter investment is with excision using level triggers, two-way direct current
Power supply uses common cathode diode, and the high branch of voltage is preferentially put into, and once-through cycle pump is preferentially powered using AC power source；When certain electricity
Pond system charge when, due to inside battery characteristic cause SOC be higher than other battery subsystems when, triggering DC-DC transformation
Device, the circulating pump power supply of the battery subsystem is derived from the pile of the battery subsystem, at this point, the battery subsystem is charging
While bringing onto load run.
It is a kind of described based on a group equalization methods for the SOC balance circuit of string all-vanadium redox flow battery system, each battery
Subsystem, AC cycles pump has two-way power supply, all the way quoted from AC power source, in addition leads to all the way quoted from the pile of battery subsystem
Inverter to be crossed, the pile end voltage of battery subsystem is reverse into alternating current, two-way AC power source uses dual power supply seamless switching,
Dual power supply one main one is standby, and default exchange branch is preferentially put into；When the charging of certain battery subsystem, since inside battery characteristic causes
When SOC is higher than other battery subsystems, the circulating pump power supply of inverter investment, the battery subsystem is taken from the battery subsystem
Pile, at this point, the battery subsystem charging while bringing onto load run.
It is a kind of described based on a group equalization methods for the SOC balance circuit of string all-vanadium redox flow battery system, each battery
Subsystem, AC cycles pump has two-way power supply, all the way quoted from AC power source, in addition all the way quoted from the pile of battery subsystem,
The pile voltage of battery subsystem is connected directly to frequency changer direct current bus by DC-DC converter, passes through frequency converter Working mould
Formula switching realizes that two-way power supply seamless switching, default exchange branch are preferentially put into；When the charging of certain battery subsystem, due to electricity
When pond bulk properties cause SOC to be higher than other battery subsystems, frequency converter switches to inverter mode, the circulation of the battery subsystem
Pump power supply is derived from frequency converter DC side, at this point, battery subsystem bringing onto load while charging is run.
The utility model has the advantages that equalizing circuit of the present invention, the pile of multiple battery subsystems is series at full vanadium liquid
In galvanic electricity cell system, and it is higher than remaining battery subsystem in the SOC of one of them or several battery subsystems, then by the battery
Subsystem is selected as power supply and puts into, i.e., is used to consume concatenated battery for the load in the all-vanadium flow battery subsystem
The electricity of the extremely raised battery subsystem of SOC makes itself and other batteries to reduce the SOC of the battery subsystem in system
Subsystem is kept in balance, also, the battery subsystem is switched for all-vanadium redox flow battery system because of the SOC high electricity generated,
So that the part electric energy not only maintains battery subsystem SOC balance, energy is not also wasted, and electricity is used to drive battery system
Own load realizes the saving of the energy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the all-vanadium redox flow battery system of the first embodiment of the invention；
Fig. 2 is equivalent impedance figure inside resistance；
Fig. 3 is the structural schematic diagram of the all-vanadium redox flow battery system of second of embodiment of the invention；
Fig. 4 is the structural schematic diagram of the all-vanadium redox flow battery system of second of embodiment of the invention；
Fig. 5 is SOC balance control flow chart.
Specific embodiment
Embodiment 1:
It is a kind of based on group string all-vanadium redox flow battery system a SOC balance circuit, the circuit by cover more battery subsystem connect
It forms, every set battery subsystem is pumped using once-through cycle, and once-through cycle pump has two-way power supply, all the way quoted from AC power source, is passed through
Switching Power Supply is rectified into direct current, and Switching Power Supply investment uses level triggers with excision；In addition all the way quoted from the battery subsystem
Pile, by DC-DC converter (such as DC-DC booster or DC-DC reducing transformer), pile end voltage transformation to once-through cycle
Available voltage value is pumped, DC-DC converter investment uses level triggers with excision.Two-way DC power supply uses two pole of common cathode
Pipe, the high branch of voltage preferentially automatically engage.Once-through cycle pump is preferentially powered using AC power source, when certain battery subsystem charges
When, when causing SOC to be higher than other set battery subsystems due to inside battery characteristic, DC-DC converter is triggered, set battery
The circulating pump power switching of system to battery subsystem pile, at this point, the set battery subsystem charging while with itself
Load running, the set battery subsystem and other electricity can be effectively reduced by being equivalent to battery charge reduction by a period of time
The SOC difference of pond system.Detailed strategy is as follows: when singly the SOC value of set battery subsystem and other battery system differences are high
When 5% (adjustable), DC-DC converter is triggered, the power supply of once-through cycle pump is provided by pile by converter, due to circulating pump
Power adjustable section, circulating pump puts into operation with rated power Pe, SOC and other systematical difference values when the set battery subsystem
Be down to 4%, circulating pump is run with 3/4Pe, when the SOC of the battery subsystem and other systematical difference values are down to 3%, circulating pump with
1/2Pe operation, when the SOC of the set battery subsystem and other systematical difference values are down to 1%, circulating pump is run with 1/4Pe, when
The SOC of the set battery subsystem is lower than other battery system values, and when difference value is less than 1%, once-through cycle pumps power switching best friend
Stream power supply, adjustment process terminate.
Embodiment 2:
It is a kind of based on group string all-vanadium redox flow battery system a SOC balance circuit, the circuit by cover more battery subsystem connect
It forms, every set battery subsystem is pumped using AC cycles, and AC cycles pump has two-way power supply, all the way quoted from alternating current；Other one
Pile end voltage is reverse into alternating current by inverter from the pile of the battery subsystem by pass.Two-way AC power source uses
Switch switching, realize dual power supply seamless switching, dual power supply one main one is standby, and default exchange branch is preferentially put into, the switching
The changeable connection of the back-up circuit and inverter of switch, inverter are connected to pile, the preferential investment circuit of the switching switch
With the changeable connection of AC power source；The connection side of switching switch and load, is connected to frequency converter, and frequency converter is exchanged with load and followed
Ring pump connection.When the charging of certain set battery subsystem, since inside battery characteristic causes SOC to be higher than other set battery subsystems,
Inverter is devoted oneself to work, and the circulating pump power supply of the set battery subsystem is derived from the pile of battery subsystem, at this point, set battery
System band own load while charging is run, and being equivalent to battery charge reduction can be effectively reduced by a period of time
The SOC difference of the set battery subsystem and other battery subsystems.Detailed strategy is as follows: as the SOC for singly covering battery subsystem
When value is higher than 5% (adjustable) with other battery subsystem differences, remote control dual power supply switching, inverter leg investment, due to following
The power adjustable section of ring pump, circulating pump are put into operation with rated power Pe, as the SOC and other System level gray correlations of the set battery subsystem
Different value is down to 4%, and circulating pump is run with 3/4Pe, when SOC and the other battery subsystem difference values of the set battery subsystem are down to
3%, circulating pump is run with 1/2Pe, when the set battery subsystem SOC and other battery subsystem difference values are down to 1%, circulating pump
It is run with 1/4Pe, when the SOC of the set battery subsystem is lower than other battery system values, when difference value is less than 1%, circulating pump is supplied
Cutting shifts to Alternating Current Power Supply, and adjustment process terminates.
Embodiment 3:
It is a kind of based on group string all-vanadium redox flow battery system a SOC balance circuit, the circuit by cover more battery subsystem connect
It forms, every set battery subsystem is pumped using AC cycles, and AC cycles pump has two-way power supply, all the way quoted from alternating current；Other one
Pass is connected directly to frequency changer direct current bus by DC-DC booster, passes through from the pile of the battery subsystem, pile voltage
The switching of frequency converter operating mode, realizes two-way power supply seamless switching.Default exchange branch is preferentially put into.When certain set battery subsystem
When charging, since inside battery characteristic causes SOC to be higher than other set battery subsystems, frequency converter switches to inverter mode, the set
The circulating pump power supply of battery subsystem is derived from frequency converter DC side, that is, is derived from pile, the set battery subsystem is in charging at this time
Simultaneously bringing onto load operation, be equivalent to battery charge reduction, by a period of time, can be effectively reduced the set battery subsystem with
The SOC difference of other battery subsystems.Detailed strategy is as follows: when the SOC value and other battery subsystems for singly covering battery subsystem
When difference of uniting is higher than 5% (adjustable), switch frequency converter operating mode, frequency converter works in inverter mode, due to recycling pump work
Rate is adjustable, and circulating pump is put into operation with rated power Pe, when SOC and the other battery subsystems of the set battery subsystem
Difference value is down to 4%, and circulating pump is run with 3/4Pe, when the SOC of the set battery subsystem and the difference value of other battery subsystems
It is down to 3%, circulating pump is run with 1/2Pe, when the SOC of the set battery subsystem and the difference value of other battery subsystems are down to
1%, circulating pump is run with 1/4Pe, and when the SOC of the set battery subsystem is lower than the value of other battery subsystems, differential pressure value is less than
When 1%, frequency converter switches to Alternating Current Power Supply, circulating pump power switching to Alternating Current Power Supply, i.e. frequency converter adjustment process terminates.
Embodiment 4:
A kind of all-vanadium redox flow battery system, including battery control system, several concatenated battery subsystems and any of the above-described
It is described that based on a group SOC balance circuit for string all-vanadium redox flow battery system, every set battery subsystem has N number of pile tandem to constitute,
Different battery subsystem series connection, battery subsystem use governor impeller, and maximum power accounts for about the 1/4 of battery subsystem；The power of pump
It is adjustable, each set battery subsystem is adjusted by adjusting power and the switchable pump power supply of the pump of every set battery subsystem
SOC.During charge or discharge, the circulating pump power supply of battery subsystem is preferentially using exchange, when a certain battery
The SOC of system is higher, then the circulating pump electricity consumption of the set battery subsystem switches to cell system power.It is adjusted in real time by online
The power of pump, the i.e. charging and discharging currents of regulating cell can guarantee that the SOC difference for each battery subsystem of connecting in charge and discharge process is small
In 1%.The system effectively solves the problems, such as more set concatenated subsystem SOC balances of all-vanadium flow battery.Wherein, the equilibrium electricity being related to
Road and all-vanadium redox flow battery system have the effect that saving equipment, reduce cost；Improve battery system utilization rate；Battery strings
Connection improves cell system voltage, reduces battery system current, reduces system loss, improves battery system efficiency.
The preferable specific embodiment of the above, only the invention, but the protection scope of the invention is not
It is confined to this, anyone skilled in the art is in the technical scope that the invention discloses, according to the present invention
The technical solution of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection scope it
It is interior.
Claims (9)
1. a kind of based on a group SOC balance circuit for string all-vanadium redox flow battery system, which is characterized in that select mould including two-way power supply
The load of block and all-vanadium redox flow battery system, in the two-way power supply selecting module is battery subsystem power supply selection mould all the way
Block is connect with a battery subsystem, and another way is AC power source selecting module, is connect with AC power source, the load
It is all exchange driving or DC driven, power supply selecting module is used for investment power supply selection, and the output to its corresponding power supply
Processing, and export to load to drive the load, multiple battery subsystems are series in all-vanadium redox flow battery system, and wherein one
A or several battery subsystem SOC are higher than remaining battery subsystem, then simultaneously using the battery subsystem as the power supply of the load
Investment.
2. as described in claim 1 based on a group SOC balance circuit for string all-vanadium redox flow battery system, which is characterized in that described
Load be all-vanadium redox flow battery system circulating pump.
3. as described in claim 1 based on a group SOC balance circuit for string all-vanadium redox flow battery system, which is characterized in that described
Power supply selecting module be respectively Switching Power Supply and DC-DC converter, the investment of power supply selecting module and excision are level triggers,
The Switching Power Supply is connected to AC power source, and connects diode D1 cathode in its outlet side, and the DC-DC converter connects
It is connected to pile, and connects diode D2 cathode, diode D1 and D2 common cathode in its outlet side, and connect load DC in cathode
Circulating pump.
4. as described in claim 1 based on a group SOC balance circuit for string all-vanadium redox flow battery system, which is characterized in that described
Power supply selecting module be switching switch, the back-up circuit of the switching switch and the changeable connection of inverter, inverter connection
In pile, the preferential investment circuit of the switching switch and the changeable connection of AC power source；The connection side of switching switch and load,
It is connected to frequency converter, and frequency converter and load AC cycles pump connect.
5. as described in claim 1 based on a group SOC balance circuit for string all-vanadium redox flow battery system, which is characterized in that described
Power supply selecting module be respectively frequency converter and DC-DC converter, two-way power supply selecting module nothing with frequency converter pattern switching
Dual power supply is changed in seaming and cutting, and DC-DC converter is connected to the DC bus of frequency converter, and frequency converter output connects with load AC cycles pump
It connects.
6. a kind of all-vanadium redox flow battery system, which is characterized in that appoint including several concatenated battery subsystems and claim 1-5
Based on a group SOC balance circuit for string all-vanadium redox flow battery system described in one.
7. it is a kind of as claimed in claim 3 based on a group equalization methods for the SOC balance circuit of string all-vanadium redox flow battery system, it is special
Sign is that each battery subsystem, once-through cycle pump has two-way power supply, whole by Switching Power Supply all the way quoted from AC power source
Direct current is flowed into, Switching Power Supply investment uses level triggers with excision, in addition passes through all the way quoted from the pile of battery subsystem
DC-DC converter, the pile end voltage transformation of battery subsystem to the available voltage value of straightway pump, DC-DC converter investment
Level triggers are used with excision, two-way DC power supply uses common cathode diode, and the high branch of voltage is preferentially put into, once-through cycle pump
Preferentially powered using AC power source；When the charging of certain battery subsystem, since inside battery characteristic causes SOC to be higher than other batteries
Subsystem when, trigger DC-DC converter, the circulating pump power supply of the battery subsystem is derived from the electricity of the battery subsystem
Heap, at this point, battery subsystem bringing onto load while charging is run.
8. it is a kind of as claimed in claim 4 based on a group equalization methods for the SOC balance circuit of string all-vanadium redox flow battery system, it is special
Sign is that each battery subsystem, AC cycles pump has two-way power supply, all the way quoted from AC power source, in addition all the way quoted from electricity
The pile end voltage of battery subsystem is reverse into alternating current, two-way AC power source is adopted by inverter by the pile of pond system
With dual power supply seamless switching, dual power supply one main one is standby, and default exchange branch is preferentially put into；When the charging of certain battery subsystem, by
When inside battery characteristic causes SOC to be higher than other battery subsystems, inverter investment, the circulating pump power supply of the battery subsystem
It is taken from the pile of the battery subsystem, at this point, battery subsystem bringing onto load while charging is run.
9. special based on a group equalization methods for the SOC balance circuit of string all-vanadium redox flow battery system described in a kind of claim 5
Sign is that each battery subsystem, AC cycles pump has two-way power supply, all the way quoted from AC power source, in addition all the way quoted from electricity
The pile voltage of the pile of pond system, battery subsystem is connected directly to frequency changer direct current bus by DC-DC converter,
Switched by frequency converter operating mode, realizes that two-way power supply seamless switching, default exchange branch are preferentially put into；When certain battery subsystem
When system charging, when causing SOC to be higher than other battery subsystems due to inside battery characteristic, frequency converter switches to inverter mode, should
The circulating pump power supply of battery subsystem is derived from frequency converter DC side, at this point, battery subsystem bringing onto load while charging is transported
Row.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810403117.2A CN110417070A (en) | 2018-04-28 | 2018-04-28 | All-vanadium redox flow battery system, based on group string all-vanadium redox flow battery system a SOC balance circuit and equalization methods |
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| CN201810403117.2A CN110417070A (en) | 2018-04-28 | 2018-04-28 | All-vanadium redox flow battery system, based on group string all-vanadium redox flow battery system a SOC balance circuit and equalization methods |
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| CN112510775A (en) * | 2020-11-24 | 2021-03-16 | 苏州精控能源科技有限公司 | Control method and device of parallel battery system and electronic equipment |
| CN114024007A (en) * | 2021-11-02 | 2022-02-08 | 北京普能世纪科技有限公司 | Vanadium cell SOC balanced system |
| CN114267856A (en) * | 2021-12-23 | 2022-04-01 | 北京普能世纪科技有限公司 | Vanadium battery SOC balance system structure and control method thereof |
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| CN112510775A (en) * | 2020-11-24 | 2021-03-16 | 苏州精控能源科技有限公司 | Control method and device of parallel battery system and electronic equipment |
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| CN114024007A (en) * | 2021-11-02 | 2022-02-08 | 北京普能世纪科技有限公司 | Vanadium cell SOC balanced system |
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Application publication date: 20191105 |