CN107768701A - A kind of extensive flow battery energy storage device - Google Patents
A kind of extensive flow battery energy storage device Download PDFInfo
- Publication number
- CN107768701A CN107768701A CN201610681583.8A CN201610681583A CN107768701A CN 107768701 A CN107768701 A CN 107768701A CN 201610681583 A CN201610681583 A CN 201610681583A CN 107768701 A CN107768701 A CN 107768701A
- Authority
- CN
- China
- Prior art keywords
- battery
- power
- soc
- group
- power cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (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)
Abstract
The invention discloses a kind of extensive flow battery energy storage device, including：Multiple A flow batteries, multiple B flow batteries and multiple C flow batteries；A flow batteries include A battery packs and the electrolyte circulation system being connected with A battery packs；B flow batteries include B battery group and the electrolyte circulation system being connected with B battery group；C flow batteries include C battery packs and the electrolyte circulation system being connected with C battery packs；Energy accumulation current converter with multiple power cells；Multiple power cells are divided into three groups, respectively A groups power cell, B groups power cell and C group power cells；The present invention improves flow battery whole efficiency and security.
Description
Technical field
The invention belongs to flow battery technology field, and in particular to a kind of extensive flow battery energy storage device.
Background technology
At present, the extensive scheme in groups of flow battery both domestic and external mainly has following several ways：1. flow battery system
Series connection；2. flow battery system is in parallel；3. flow battery system string simultaneously combines；The extensive scheme in groups of existing flow battery is deposited
In following defect：
1st, each pile series connection is limited with series in parallel inside flow battery system, due in same system each pile it
Between share a set of electrolyte storage tank and pipeline, each pile, which bears larger voltage, after by plural serial stage causes in system pipeline
Leakage current increases, and damages equipment, and simultaneously joint conference causes brownout, and electric current is excessive, and system effectiveness is too low, can not be converted to needs
AC system；
2nd, series connection with parallel, strictly will between multiple flow battery systems during serial or parallel connection between flow battery system
Pipeline is separate between seeking each system, because SOC is inconsistent between each flow battery system internal resistance deviation causes each system, warp
Wooden pail effect can be formed after crossing multiple charge and discharge cycles, causes whole system to be paralysed, is to use for this problem prior art
Each set all positive pole storage tanks of flow battery system are connected by pipeline, all negative pole storage tanks are connected by pipeline, are come balanced each
SOC between individual system, but can so cause pipeline is connected between each system in discharge and recharge to produce larger leakage current off-energy,
The easy burning apparatus of high current simultaneously, influences capacity utilization.
In addition, flow battery system is turned by energy accumulation current converter again after certain series, parallel or connection in series-parallel
Change three-phase alternating current into and be electrically connected to AC network；Energy accumulation current converter is that three-phase is complete used by flow battery technology field at present
Bridge current transformer is controlled, the technology that the existing power model by included by current transformer carries out serial or parallel connection is applied in silent oscillation dynamic
On reactive power compensator (SVG), not yet it is related to the application of flow battery system；Existing current transformer also there is H bridges tandem type to become
Device structure is flowed, wherein H bridges series voltage is higher, and flow battery can not meet high voltage requirement, also, in H bridge cascaded structures, respectively
The voltage of individual power model is overlay model, therefore it is required that flow battery system is completely independent insulation, and existing flow battery
Each power cell of system is connected by electrolyte circulation line to be separated, therefore H bridge cascade connection type current transformer structures and is not applied to
In existing flow battery system.
The content of the invention
The present invention is directed to the proposition of problem above, and develops a kind of flow battery system and extensive flow battery energy storage dress
Put.
The technological means of the present invention is as follows：
A kind of extensive flow battery energy storage device, including：
Multiple A flow batteries, multiple B flow batteries and multiple C flow batteries；The A flow batteries include A battery packs and
The electrolyte circulation system being connected with A battery packs；The B flow batteries include B battery group and the electricity being connected with B battery group
Solve fluid circulation；The C flow batteries include C battery packs and the electrolyte circulation system being connected with C battery packs；
Energy accumulation current converter with multiple power cells；The multiple power cell is divided into three groups, respectively A groups power
Unit, B groups power cell and C group power cells；The A phase lines and neutrality of three-phase electricity are accessed after the cascade of A group power cells AC
Between line, DC side connects each A battery packs respectively；The B phase lines and neutrality of three-phase electricity are accessed after the cascade of B group power cells AC
Between line, DC side connects each B battery group respectively；The C phase lines and neutrality of three-phase electricity are accessed after the cascade of C group power cells AC
Between line, DC side connects each C battery packs respectively；
Further, A battery packs, B battery group or C battery packs are respectively included in the multiple electricity being serially connected on circuit
Heap；The electrolyte circulation system comprises at least positive pole storage tank, negative pole storage tank and electrolyte circulation line；A battery packs, B battery
It is electrically isolated from each other between group and C battery packs and equipotential；
Further, the liquid stream electricity is changed by increasing the quantity of A flow batteries, B flow batteries and C flow batteries
The energy storage scale of cell system；
Further,
DC/DC isolated variable modules are equipped between each power cell and A battery pack, B battery group and C battery packs；
Or the energy storage device also includes A transformers, B transformers and C transformers；The primary side winding both ends of A transformers
The A phase lines and the neutral conductor of three-phase electricity are connected respectively；The A transformers connect A group power cells respectively by multiple vice-side windings
Each power cell AC；The primary side winding both ends of B transformers connect the B phase lines and the neutral conductor of three-phase electricity respectively；The B becomes
Depressor connects each power cell AC of B group power cells by multiple vice-side windings respectively；The primary side winding two of C transformers
End connects the C phase lines and the neutral conductor of three-phase electricity respectively；The C transformers connect C group power lists respectively by multiple vice-side windings
Each power cell AC of member；
Further, each power cell input/output argument included by A groups power cell is identical；B groups power cell institute
Including each power cell input/output argument it is identical；Each power cell input/output argument phase included by C group power cells
Together；The power cell uses H bridge translation circuits；
Further, reduced by adjusting each power cell AC voltage of A group power cells between each A battery packs
SOC differences；It is poor that the SOC between each B battery group is reduced by adjusting each power cell AC voltage of B group power cells
It is different；The SOC differences between each C battery packs are reduced by adjusting each power cell AC voltage of C group power cells；
Further,
In charging process, by each power cell AC voltage for adjusting A group power cells so that multiple A batteries
SOC value meets the power that the battery pack of the first preparatory condition absorbs and meets the battery pack of the second preparatory condition less than SOC value in group
The power of absorption, by each power cell AC voltage for adjusting B group power cells so that SOC value accords with multiple B battery groups
The power for closing the battery pack absorption of the first preparatory condition is less than the power that SOC value meets the battery pack absorption of the second preparatory condition,
By each power cell AC voltage for adjusting C group power cells so that it is default to meet first for SOC value in multiple C battery packs
The power that the battery pack of condition absorbs meets the power of the battery pack absorption of the second preparatory condition less than SOC value；
In discharge process, by each power cell AC voltage for adjusting A group power cells so that multiple A batteries
SOC value meets the power of the battery pack release of the first preparatory condition and meets the battery pack of the second preparatory condition higher than SOC value in group
The power of release, by each power cell AC voltage for adjusting B group power cells so that SOC value accords with multiple B battery groups
The power for closing the battery pack release of the first preparatory condition is higher than the power that SOC value meets the battery pack release of the second preparatory condition,
By each power cell AC voltage for adjusting C group power cells so that it is default to meet first for SOC value in multiple C battery packs
The power of the battery pack release of condition meets the power of the battery pack release of the second preparatory condition higher than SOC value；
Further, modulating wave Δ V is passed throughCAi=k1·k2·ΔSOCAi·VCATo i-th of power in A group power cells
Unit is modulated, and passes through modulating wave Δ VCBi=k1·k2·ΔSOCBi·VCBTo i-th of power cell in B group power cells
It is modulated, passes through modulating wave Δ VCCi=k1·k2·ΔSOCCi·VCCI-th of power cell in C group power cells is carried out
Modulation；
Wherein, Δ VCAiRepresent the modulating wave being modulated to i-th of power cell in A group power cells, Δ VCBiRepresent
The modulating wave being modulated to i-th of power cell in B group power cells, Δ VCCiRepresent to i-th of power in C group power cells
The modulating wave that unit is modulated,k2=0~2, Δ SOCAi=SOCA-SOCAi, SOCARepresent multiple A electricity
The SOC average values of pond group,SOCAiThe SOC value of i-th of A battery pack is represented,
VCARepresent A phase voltages, SOCBRepresent multiple B battery groups SOC average values,
SOCBiRepresent the SOC value of i-th of B battery group, VCBRepresent B phase voltages, SOCCRepresent multiple C battery packs SOC average values,SOCCiRepresent the SOC value of i-th of C battery pack, VCCC phase voltages are represented,
I=1,2 ... n, IdRepresent the total current of energy accumulation current converter DC side；
Further, by adjusting A groups power cell, the input power of B groups power cell and C group power cells or output
Power reduces the SOC differences between A battery packs, B battery group and C battery packs；
Further, by neutral point superimposed voltage V0(t)=k1·k0Δ SOCcos (ω t+ δ-γ) is adjusted
The input power or power output of A groups power cell, B groups power cell and C group power cells；
Wherein,
ΔSOCA=SOCavg-SOCA, Δ SOCB=SOCavg-SOCB, Δ SOCC=SOCavg-SOCC,SOCAiRepresent i-th
The SOC value of A battery packs,SOCBiThe SOC value of i-th of B battery group is represented,SOCCiRepresent the SOC value of i-th of C battery pack, i=1,2 ... n, ω represent three
The mutually angular frequency of electricity, t represent the time,
IqRepresent the total current of energy accumulation current converter AC.
By adopting the above-described technical solution, a kind of extensive flow battery energy storage device provided by the invention, Neng Goubao
It is constant to hold each battery pack reference potential, it is relative to save energy storage inverter cost, it is not necessary to higher pressure-resistant design；A flow batteries
The B groups power cell and C flow batteries that the A groups power cell that is connected with it, B flow batteries are connected with it are the same as its institute
The C groups power cell of connection forms a level, and the power of the battery pack included by different levels is controllable, each so as to adjust
SOC between the different alternate battery packs of level, solves SOC inconsistence problems between each level；When each level battery pack SOC phases
, can be by controlling energy accumulation current converter to make SOC tend to restrain in the case of difference is larger；When carrying out dilatation to flow battery system, only
Need to increase single battery group power, charging and discharging currents do not change；Flow battery needs not move through repeatedly series connection and parallel connection,
The leakage current of electrolyte can be substantially reduced, improves flow battery whole efficiency and security；In equivalent capability and voltage
Under the conditions of compared with the energy-storage system of other topological structures, battery cluster DC voltage, the electric current of this structure connection are smaller, reduce
The series-parallel scale of flow battery, reduces influence of the battery short -board effect to high capacity cell energy-storage system.
Brief description of the drawings
Fig. 1 is the structural representation of A flow batteries of the present invention；
Fig. 2 and Fig. 3 is the structural representation of energy storage device of the present invention；
Fig. 4-a, Fig. 4-b, Fig. 4-c are the SOC of the multiple A battery packs of the present invention, multiple B battery groups or multiple C battery packs
The input power situation schematic diagram of the state of average value and corresponding A groups power cell, B groups power cell or C group power cells.
In figure：1st, pile, 2, A group power cells, 3, DC/DC isolated variable modules, 4, B group power cells, 5, C group power
Unit, 6, A transformers, 7, B transformers, 8, C transformers, 9, A flow batteries, 10, B flow batteries, 11, C flow batteries.
Embodiment
A kind of extensive flow battery energy storage device as shown in Figures 2 and 3, including：Multiple A flow batteries 9, multiple B
Flow battery 10 and multiple C flow batteries 11；The A flow batteries 9 include A battery packs and the electrolysis being connected with A battery packs
Fluid circulation；The B flow batteries 10 include B battery group and the electrolyte circulation system being connected with B battery group；The C
Flow battery 11 includes C battery packs and the electrolyte circulation system being connected with C battery packs；Energy storage with multiple power cells
Current transformer；The multiple power cell is divided into three groups, respectively A groups power cell 2, B groups power cell 4 and C group power lists
Member 5；Accessed after the cascade of the AC of A groups power cell 2 between A phase lines and the neutral conductor of three-phase electricity, DC side connects each A electricity respectively
Pond group；Accessed after the cascade of the AC of B groups power cell 4 between B phase lines and the neutral conductor of three-phase electricity, DC side connects each B respectively
Battery pack；Accessed after the cascade of the AC of C groups power cell 5 between C phase lines and the neutral conductor of three-phase electricity, DC side connects respectively respectively
C battery packs；Further, A battery packs, B battery group or C battery packs are respectively included in the multiple piles being serially connected on circuit
1；The electrolyte circulation system comprises at least positive pole storage tank, negative pole storage tank and electrolyte circulation line；Further, A batteries
It is electrically isolated from each other between group, B battery group and C battery packs and equipotential；Further, by increasing A flow batteries 9, B liquid streams electricity
The quantity of pond 10 and C flow batteries 11 changes the energy storage scale of the flow battery system；Further, each power cell with
DC/DC isolated variables module 3 is equipped between A battery packs, B battery group and C battery packs；Or the energy storage device also includes A
Transformer 6, B transformers 7 and C transformers 8；The primary side winding both ends of A transformers 6 connect the A phase lines and neutrality of three-phase electricity respectively
Line；The A transformers 6 connect each power cell AC of A groups power cell 2 by multiple vice-side windings respectively；B transformers
7 primary side winding both ends connect the B phase lines and the neutral conductor of three-phase electricity respectively；The B transformers 7 are distinguished by multiple vice-side windings
Connect each power cell AC of B groups power cell 4；The primary side winding both ends of C transformers 8 connect the C phases of three-phase electricity respectively
Line and the neutral conductor；Each power cell that the C transformers 8 connect C groups power cell 5 by multiple vice-side windings respectively exchanges
Side；Further, each power cell input/output argument included by A groups power cell 2 is identical；Included by B groups power cell 4
Each power cell input/output argument it is identical；Each power cell input/output argument included by C groups power cell 5 is identical；
The power cell uses H bridge translation circuits；Further, it is electric by adjusting each power cell AC of A groups power cell 2
Press to reduce the SOC differences between each A battery packs；Contracted by adjusting each power cell AC voltage of B groups power cell 4
SOC differences between small each B battery group；Each C is reduced by adjusting each power cell AC voltage of C groups power cell 5
SOC differences between battery pack；Further, in charging process, handed over by each power cell for adjusting A groups power cell 2
Flow side voltage so that SOC value meets the power of the battery pack absorption of the first preparatory condition less than SOC value symbol in multiple A battery packs
The power that the battery pack of the second preparatory condition absorbs is closed, by adjusting each power cell AC voltage of B groups power cell 4,
So that in multiple B battery groups SOC value meet the first preparatory condition battery pack absorb power less than SOC value meet second preset
The power that the battery pack of condition absorbs, by each power cell AC voltage for adjusting C groups power cell 5 so that multiple C electricity
SOC value meets the power that the battery pack of the first preparatory condition absorbs and meets the battery of the second preparatory condition less than SOC value in the group of pond
The power that group absorbs；In discharge process, by each power cell AC voltage for adjusting A groups power cell 2 so that multiple
SOC value meets the power of the battery pack release of the first preparatory condition and meets the electricity of the second preparatory condition higher than SOC value in A battery packs
The power of pond group release, by each power cell AC voltage for adjusting B groups power cell 4 so that in multiple B battery groups
The power that SOC value meets the battery pack release of the first preparatory condition is higher than the battery pack release that SOC value meets the second preparatory condition
Power, by each power cell AC voltage for adjusting C groups power cell 5 so that SOC value meets in multiple C battery packs
The power of the battery pack release of first preparatory condition meets the power of the battery pack release of the second preparatory condition higher than SOC value；Enter
One step, pass through modulating wave Δ VCAi=k1·k2·ΔSOCAi·VCAI-th of power cell in A groups power cell 2 is adjusted
System, passes through modulating wave Δ VCBi=k1·k2·ΔSOCBi·VCBI-th of power cell in B groups power cell 4 is modulated,
Pass through modulating wave Δ VCCi=k1·k2·ΔSOCCi·VCCI-th of power cell in C groups power cell 5 is modulated；Its
In, Δ VCAiRepresent the modulating wave being modulated to i-th of power cell in A groups power cell 2, Δ VCBiRepresent to B group power
The modulating wave that i-th of power cell is modulated in unit 4, Δ VCCiExpression is entered to i-th of power cell in C groups power cell 5
The modulating wave of row modulation,k2=0~2, Δ SOCAi=SOCA-SOCAi, SOCARepresent multiple A battery packs
SOC average values,SOCAiRepresent the SOC value of i-th of A battery pack, VCA
Represent A phase voltages, SOCBRepresent multiple B battery groups SOC average values,
SOCBiRepresent the SOC value of i-th of B battery group, VCBRepresent B phase voltages, SOCCRepresent multiple C battery packs SOC average values,SOCCiRepresent the SOC value of i-th of C battery pack, VCCC phase voltages are represented,
I=1,2 ... n, IdRepresent the total current of energy accumulation current converter DC side；First preparatory condition can be the SOC of X battery packs
Average value of the value optionally greater than the SOC value of multiple X battery packs；The X battery packs are A battery packs, B battery group or C battery packs,
That is, for multiple A battery packs, in charging process, the power that some A battery packs in multiple A battery packs absorb is made less than another
Some outer A battery packs, in discharge process, the power of some A battery packs release is released higher than the other A battery packs
The power put, the SOC value of some A battery packs here are optionally greater than the SOC value average value of multiple A battery packs, other A electricity
The SOC value of pond group is less than the SOC value average value of multiple A battery packs；Similarly, for multiple B battery groups, in charging process,
The power for absorbing some B battery groups in multiple B battery groups is less than other B battery group, in discharge process, described one
The power of a little B battery group releases is higher than the power of other B battery group release, the SOC value of some B battery groups here
Optionally greater than the SOC value average value of multiple B battery groups, the SOC value of other B battery group is less than the SOC value of multiple B battery groups
Average value；For multiple C battery packs, in charging process, the power for absorbing some C battery packs in multiple C battery packs is low
In other C battery packs, in discharge process, the power of some C battery packs release is higher than the other C batteries
The power of group release, the SOC values of some C battery packs here are optionally greater than the SOC value average value of multiple C battery packs, and in addition one
The SOC value of a little C battery packs is less than the SOC value average value of multiple C battery packs；Further, the present invention can also realize energy storage device
Alternate SOC balance, alternate SOC balance refers to the SOC differences reduced between A battery packs, B battery group and C battery packs, further
Ground, reduce A electricity by adjusting A groups power cell 2, the input power of B groups power cell 4 and C groups power cell 5 or power output
SOC differences between pond group, B battery group and C battery packs；Further, by neutral point superimposed voltage V0(t)=k1·k0·
Δ SOCcos (ω t+ δ-γ) adjusts the input power or defeated of A groups power cell 2, B groups power cell 4 and C groups power cell 5
Go out power；Wherein,k0=0~1,Δ
SOCA=SOCavg-SOCA, Δ SOCB=SOCavg-SOCB, Δ SOCC=SOCavg-SOCC, SOCAiRepresent i-th
The SOC value of individual A battery packs,SOCBiThe SOC value of i-th of B battery group is represented,SOCCiRepresent the SOC value of i-th of C battery pack, i=1,2 ... n, ω are represented
The angular frequency of three-phase electricity, t represent the time,
IqThe total current of energy accumulation current converter AC is represented, by neutral point injecting voltage so that neutral point excursion, A phase voltages, B
Difference is presented in phase voltage and C phase voltages, so during electric discharge operation, phase output power big SOC, phase power output small SOC
Small, in charge operation, phase charge power big SOC is small, and phase charge power small SOC is big, reduces both SOC difference.
Each vice-side winding no-load voltage ratio Ki of A transformers 6 of the present invention, B transformers 7 or C transformers 8 can be according to system requirements
It is determined that multiple battery packs form battery matrix, often row is all an individually controllable flow battery to matrix, and energy storage device includes more
Individual flow battery, the electricity between multiple flow batteries is often realized between set flow battery by series connection accumulation current transformer or transformer
Road connects, and is each other equipotential often to be electrically isolated between row battery pack；The present invention uses multi-tap formula transformer or energy storage
Current transformer will isolate between A, B, C three-phase so that interphase potential is identical, and corresponding power cell and flow battery unit are in electricity
It is also equipotential in road, and it is separate in circuit；It is a set of with being shared in A, B, C three-phase converter module in layer；In addition, institute
Stating energy storage device also has certain redundancy feature, when any one flow battery breaks down, can be disconnected by breaker with
Ensure other flow battery normal works.
Fig. 1 shows the structural representation of A flow batteries 9 of the present invention, B flow batteries 10 and C flow batteries 11 and A liquid streams
The structure of battery 9 is identical；Fig. 2 and Fig. 3 shows the structural representation of energy storage device of the present invention, as shown in Fig. 2 A phase lines,
B phase lines also connect power network with C phase lines by main transformer T；Energy accumulation current converter can use three-phase full-controlled bridge circuit structure, described
Electrolyte circulation system includes positive pole storage tank, negative pole storage tank and electrolyte circulation line, in addition to circulating pump, the electrolyte follow
Endless tube road specifically includes the water influent pipeline for the pile 1 gone to by positive pole storage tank in battery pack, returned just by the pile 1 in battery pack
The liquid back pipe road of pole storage tank, the water influent pipeline for the pile 1 gone to by negative pole storage tank in battery pack and by the pile in battery pack
1 returns to the liquid back pipe road of negative pole storage tank；Each internal pile 1 is cascaded structure for A battery packs, B battery group and C battery packs, electricity
The electric current of heap 1 is equal, and 1 group of voltage (U1+, U1-) is had inside each flow battery；Each power cell and A battery packs, B battery group
DC/DC isolated variables module 3 is equipped between C battery packs, the DC/DC isolated variables module 3 can specifically use multiple
Copped wave DC-isolation booster circuit, the electricity between each power cell can be realized by multiple copped wave DC-isolation booster circuit
Position isolates, and A transformers 6, B transformers 7 and the C transformers 8 in Fig. 3 can play a part of potential isolation；The power cell
Using H bridge translation circuits, there is high voltage, Large Copacity, good output waveform, easy the characteristics of extending and can realizing redundancy；This hair
It is bright to realize SOC balance in the phase of energy storage device, SOC balance refers to reducing between each A battery packs in phase SOC differences,
Reduce the SOC differences between each B battery group or the SOC differences reduced between each C battery packs；Because each power cell exchanges
It is identical that the electric current of each power current AC is flowed through in the A groups power cell 2 of side cascade, therefore is keeping A phase voltages constant
Under the premise of, adjust each power cell AC voltage in phase, you can realize the area of each power cell input power or power output
It Hua not control, and then realize the regulation of SOC deviations in phase, A groups power cell 2 here can also be B groups power cell 4 or C
Group power cell 5, accordingly, A phase voltages can also be B phase voltages or C phase voltages, further, pass through modulating wave Δ VCAi=
k1·k2·ΔSOCAi·VCAI-th of power cell in A groups power cell 2 is modulated, passes through modulating wave Δ VCBi=k1·
k2·ΔSOCBi·VCBI-th of power cell in B groups power cell 4 is modulated, passes through modulating wave Δ VCCi=k1·k2·
ΔSOCCi·VCCI-th of power cell in C groups power cell 5 is modulated, realizes that the big battery pack of SOC value was being discharged
With the more delivered powers of the modulating wave of higher magnitude in journey, then with compared with the few absorbed power of the modulating wave of small magnitude in charging process,
The small battery pack of SOC value in discharge process with compared with the few delivered power of the modulating wave of small magnitude, then with larger in charging process
The more absorbed powers of modulating wave of amplitude, rule, is adjusted by the discharge and recharge of friction speed, finally causes each battery pack according to this
SOC is convergent；Fig. 4-a, Fig. 4-b, Fig. 4-c show the multiple A battery packs of the present invention, multiple B battery groups or multiple C battery packs
The input power situation of the state of SOC average values and corresponding A groups power cell 2, B groups power cell 4 or C groups power cell 5
Schematic diagram, as depicted in fig. 4-a, when the SOC average values of multiple A battery packs, multiple B battery groups or multiple C battery packs are relatively low,
The output of corresponding A groups power cell 2, B groups power cell 4 or C groups power cell 5 is small, as shown in Fig. 4-b, when multiple A batteries
When the SOC average values of group, multiple B battery groups or multiple C battery packs are normal, corresponding A groups power cell 2, B group power cells
The output of 4 or C groups power cell 5 is normal, as shown in Fig. 4-c, when multiple A battery packs, multiple B battery groups or multiple C battery packs
SOC average values it is higher when, the output of corresponding A groups power cell 2, B groups power cell 4 or C groups power cell 5 is big.
Flow battery system provided by the invention and extensive flow battery energy storage device, each battery pack can be kept to refer to
Current potential is constant, relative to save energy storage inverter cost, it is not necessary to higher pressure-resistant design；What each flow battery was connected with it
A groups power cell, B groups power cell and C groups power cell form a level, the power of the battery pack included by different levels
It is controllable, so as to adjust the SOC between the different alternate battery packs of each level, solve SOC inconsistence problems between each level；
, can be by controlling energy accumulation current converter to make SOC tend to restrain in the case of each level battery pack SOC differences are larger；To liquid stream electricity
When cell system carries out dilatation, it is only necessary to increase single battery group power, charging and discharging currents do not change；Flow battery need not
By repeatedly series connection and parallel connection, you can substantially reduce the leakage current of electrolyte, improve flow battery whole efficiency and security；
Under equivalent capability and voltage conditions compared with the energy-storage system of other topological structures, the battery cluster direct current of this structure connection
Pressure, electric current are smaller, reduce the series-parallel scale of flow battery, reduce battery short -board effect to high capacity cell energy-storage system
Influence.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (10)
1. a kind of extensive flow battery energy storage device, it is characterised in that the energy storage device includes：
Multiple A flow batteries, multiple B flow batteries and multiple C flow batteries；The A flow batteries include A battery packs and and A
The electrolyte circulation system that battery pack is connected；The B flow batteries include B battery group and the electrolysis being connected with B battery group
Fluid circulation；The C flow batteries include C battery packs and the electrolyte circulation system being connected with C battery packs；
Energy accumulation current converter with multiple power cells；The multiple power cell is divided into three groups, respectively A groups power list
Member, B groups power cell and C group power cells；The A phase lines and the neutral conductor of three-phase electricity are accessed after the cascade of A group power cells AC
Between, DC side connects each A battery packs respectively；The B phase lines and the neutral conductor of three-phase electricity are accessed after the cascade of B group power cells AC
Between, DC side connects each B battery group respectively；The C phase lines and the neutral conductor of three-phase electricity are accessed after the cascade of C group power cells AC
Between, DC side connects each C battery packs respectively.
2. a kind of extensive flow battery energy storage device according to claim 1, it is characterised in that A battery packs, B battery group
Or C battery packs are respectively included in the multiple piles being serially connected on circuit；The electrolyte circulation system comprises at least positive pole
Storage tank, negative pole storage tank and electrolyte circulation line；It is electrically isolated from each other between A battery packs, B battery group and C battery packs and equipotential.
3. a kind of extensive flow battery energy storage device according to claim 1, it is characterised in that by increasing A liquid streams electricity
The quantity in pond, B flow batteries and C flow batteries changes the energy storage scale of the flow battery system.
A kind of 4. extensive flow battery energy storage device according to claim 1, it is characterised in that
DC/DC isolated variable modules are equipped between each power cell and A battery pack, B battery group and C battery packs；
Or the energy storage device also includes A transformers, B transformers and C transformers；The primary side winding both ends difference of A transformers
Connect the A phase lines and the neutral conductor of three-phase electricity；The A transformers connect each of A group power cells respectively by multiple vice-side windings
Power cell AC；The primary side winding both ends of B transformers connect the B phase lines and the neutral conductor of three-phase electricity respectively；The B transformers
Connect each power cell AC of B group power cells respectively by multiple vice-side windings；The primary side winding both ends of C transformers point
Not Lian Jie three-phase electricity C phase lines and the neutral conductor；The C transformers connect C group power cells respectively by multiple vice-side windings
Each power cell AC.
5. a kind of extensive flow battery energy storage device according to claim 1, it is characterised in that A group power cells are wrapped
Each power cell input/output argument included is identical；Each power cell input/output argument included by B group power cells is identical；
Each power cell input/output argument included by C group power cells is identical；The power cell uses H bridge translation circuits.
6. a kind of extensive flow battery energy storage device according to claim 1, it is characterised in that by adjusting A group power
Each power cell AC voltage of unit reduces the SOC differences between each A battery packs；By adjusting B group power cells
Each power cell AC voltage reduces the SOC differences between each B battery group；By each power for adjusting C group power cells
Unit AC voltage reduces the SOC differences between each C battery packs.
A kind of 7. extensive flow battery energy storage device according to claim 6, it is characterised in that
In charging process, by each power cell AC voltage for adjusting A group power cells so that in multiple A battery packs
The battery pack that the power that the battery pack that SOC value meets the first preparatory condition absorbs meets the second preparatory condition less than SOC value absorbs
Power, by each power cell AC voltage for adjusting B group power cells so that SOC value meets in multiple B battery groups
The power that the battery pack of one preparatory condition absorbs meets the power of the battery pack absorption of the second preparatory condition less than SOC value, passes through
Adjust each power cell AC voltage of C group power cells so that SOC value meets the first preparatory condition in multiple C battery packs
Battery pack absorb power less than SOC value meet the second preparatory condition battery pack absorb power；
In discharge process, by each power cell AC voltage for adjusting A group power cells so that in multiple A battery packs
The power that SOC value meets the battery pack release of the first preparatory condition is higher than the battery pack release that SOC value meets the second preparatory condition
Power, by each power cell AC voltage for adjusting B group power cells so that SOC value meets in multiple B battery groups
The power of the battery pack release of one preparatory condition meets the power of the battery pack release of the second preparatory condition higher than SOC value, passes through
Adjust each power cell AC voltage of C group power cells so that SOC value meets the first preparatory condition in multiple C battery packs
Battery pack release power higher than SOC value meet the second preparatory condition battery pack release power.
8. a kind of extensive flow battery energy storage device according to claim 7, it is characterised in that pass through modulating wave Δ VCAi
=k1·k2·ΔSOCAi·VCAI-th of power cell in A group power cells is modulated, passes through modulating wave Δ VCBi=
k1·k2·ΔSOCBi·VCBI-th of power cell in B group power cells is modulated, passes through modulating wave Δ VCCi=k1·
k2·ΔSOCCi·VCCI-th of power cell in C group power cells is modulated；
Wherein, Δ VCAiRepresent the modulating wave being modulated to i-th of power cell in A group power cells, Δ VCBiRepresent to B groups
The modulating wave that i-th of power cell is modulated in power cell, Δ VCCiExpression is entered to i-th of power cell in C group power cells
The modulating wave of row modulation,k2=0~2, Δ SOCAi=SOCA-SOCAi, SOCARepresent multiple A battery packs
SOC average values,SOCAiRepresent the SOC value of i-th of A battery pack, VCA
Represent A phase voltages, SOCBRepresent multiple B battery groups SOC average values,
SOCBiRepresent the SOC value of i-th of B battery group, VCBRepresent B phase voltages, SOCCRepresent multiple C battery packs SOC average values,SOCCiRepresent the SOC value of i-th of C battery pack, VCCC phase voltages are represented,
I=1,2 ... n, IdRepresent the total current of energy accumulation current converter DC side.
9. a kind of extensive flow battery energy storage device according to claim 1, it is characterised in that by adjusting A group power
Unit, the input power of B groups power cell and C group power cells or power output reduce A battery packs, B battery group and C batteries
SOC differences between group.
10. a kind of extensive flow battery energy storage device according to claim 9, it is characterised in that by being folded in neutral point
Making alive V0(t)=k1·k0Δ SOCcos (ω t+ δ-γ) adjusts A groups power cell, B groups power cell and C group work(
The input power or power output of rate unit；
Wherein,k0=0~1,ΔSOCA
=SOCavg-SOCA, Δ SOCB=SOCavg-SOCB, Δ SOCC=SOCavg-SOCC,SOCAiRepresent i-th of A
The SOC value of battery pack,SOCBiThe SOC value of i-th of B battery group is represented,SOCCiRepresent the SOC value of i-th of C battery pack, i=1,2 ... n, ω represent three
The mutually angular frequency of electricity, t represent the time,
IqRepresent the total current of energy accumulation current converter AC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681583.8A CN107768701A (en) | 2016-08-17 | 2016-08-17 | A kind of extensive flow battery energy storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681583.8A CN107768701A (en) | 2016-08-17 | 2016-08-17 | A kind of extensive flow battery energy storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107768701A true CN107768701A (en) | 2018-03-06 |
Family
ID=61260279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610681583.8A Pending CN107768701A (en) | 2016-08-17 | 2016-08-17 | A kind of extensive flow battery energy storage device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107768701A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019006713A1 (en) * | 2019-09-25 | 2021-03-25 | Eckehard Tröster | Electrolyte supply for flow batteries |
| CN114447381A (en) * | 2022-02-10 | 2022-05-06 | 北京能高自动化技术股份有限公司 | Group string type flow battery energy storage system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916440A (en) * | 2012-09-20 | 2013-02-06 | 中国电力科学研究院 | Battery energy storage system based power conversion system and control method thereof |
| CN103390920A (en) * | 2013-07-23 | 2013-11-13 | 大连融科储能技术发展有限公司 | All vanadium redox flow battery management method and system applied to scale energy storage |
| CN204497319U (en) * | 2015-03-20 | 2015-07-22 | 安徽美能储能***有限公司 | A kind of parallel circuits for zinc bromine liquid energy-storage system |
| CN104916856A (en) * | 2014-03-13 | 2015-09-16 | 大连融科储能技术发展有限公司 | Energy storage system capable of increasing operational reliability of flow battery and method thereof |
| CN104917418A (en) * | 2015-06-16 | 2015-09-16 | 北京亿利智慧能源科技有限公司 | Energy storage type MMC current transformer adopting independent control of battery current |
| CN105337297A (en) * | 2015-12-09 | 2016-02-17 | 北京能源投资（集团）有限公司 | Balancing method and the device for state of charge (SOC) of energy storage system |
| CN205248821U (en) * | 2015-12-09 | 2016-05-18 | 中国西电电气股份有限公司 | Battery energy storage system |
-
2016
- 2016-08-17 CN CN201610681583.8A patent/CN107768701A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916440A (en) * | 2012-09-20 | 2013-02-06 | 中国电力科学研究院 | Battery energy storage system based power conversion system and control method thereof |
| CN103390920A (en) * | 2013-07-23 | 2013-11-13 | 大连融科储能技术发展有限公司 | All vanadium redox flow battery management method and system applied to scale energy storage |
| CN104916856A (en) * | 2014-03-13 | 2015-09-16 | 大连融科储能技术发展有限公司 | Energy storage system capable of increasing operational reliability of flow battery and method thereof |
| CN204497319U (en) * | 2015-03-20 | 2015-07-22 | 安徽美能储能***有限公司 | A kind of parallel circuits for zinc bromine liquid energy-storage system |
| CN104917418A (en) * | 2015-06-16 | 2015-09-16 | 北京亿利智慧能源科技有限公司 | Energy storage type MMC current transformer adopting independent control of battery current |
| CN105337297A (en) * | 2015-12-09 | 2016-02-17 | 北京能源投资（集团）有限公司 | Balancing method and the device for state of charge (SOC) of energy storage system |
| CN205248821U (en) * | 2015-12-09 | 2016-05-18 | 中国西电电气股份有限公司 | Battery energy storage system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019006713A1 (en) * | 2019-09-25 | 2021-03-25 | Eckehard Tröster | Electrolyte supply for flow batteries |
| CN114447381A (en) * | 2022-02-10 | 2022-05-06 | 北京能高自动化技术股份有限公司 | Group string type flow battery energy storage system |
| CN114447381B (en) * | 2022-02-10 | 2024-05-10 | 北京能高自动化技术股份有限公司 | Group string type flow battery energy storage system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104852406B (en) | Mixed micro-grid system based on power electronic transformer and power control method of system | |
| CN110350564B (en) | High-voltage direct-hanging energy storage device and power control method | |
| CN112510715B (en) | Multi-port alternating current power grid flexible interconnection device and control method and system thereof | |
| Bahrman et al. | The ABCs of HVDC transmission technologies | |
| Li et al. | Realization of reactive power compensation near the LCC-HVDC converter bridges by means of an inductive filtering method | |
| CN103236800B (en) | Novel topological structure voltage source type inverter and adjusting method | |
| CN207459728U (en) | A kind of accumulation energy type multiport electric power electric transformer | |
| CN108667036A (en) | A kind of electric vehicle V2G inverter control methods | |
| CN106159976A (en) | A kind of series compensation device | |
| CN109638897A (en) | A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network | |
| CN105207208B (en) | Realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously | |
| CN105207504B (en) | A kind of MMC topologys with enhancing voltage characteristic half-bridge full-bridge mixed type | |
| CN103066587A (en) | Optimal configuration method of modular multi-level flexible direct current system | |
| CN110445389A (en) | The solid-state transformer device and its control method for having true bipolar low-pressure DC port | |
| CN104218805A (en) | Unipolar-bipolar convertible direct-current converter | |
| CN106712024A (en) | Energy Internet for electric car charging station | |
| CN104836455A (en) | Power distribution network power electronic transformer and control method thereof | |
| CN106026154A (en) | Modeling method for extra-high-voltage direct-current layered access power transmission system | |
| CN108599216A (en) | Chain type battery energy storage system and its working method | |
| CN103199630A (en) | High-capacity medium voltage battery energy storage system | |
| CN104617583A (en) | Mixed railway power quality control system based on multifunctional balanced transformer | |
| US11705570B2 (en) | Flow battery system and large scale flow battery energy storage device | |
| CN107768701A (en) | A kind of extensive flow battery energy storage device | |
| CN107123998A (en) | A kind of scale electric automobile charge-discharge circuit topology and control strategy based on MMC | |
| Roy et al. | A hybrid FACTS topology for reactive power support in high voltage transmission systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180306 |
|
| RJ01 | Rejection of invention patent application after publication |