CN107666147A - A kind of power network energy-storage system - Google Patents
A kind of power network energy-storage system Download PDFInfo
- Publication number
- CN107666147A CN107666147A CN201610598673.0A CN201610598673A CN107666147A CN 107666147 A CN107666147 A CN 107666147A CN 201610598673 A CN201610598673 A CN 201610598673A CN 107666147 A CN107666147 A CN 107666147A
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- China
- Prior art keywords
- battery
- module
- converters
- storage system
- power network
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- 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
- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 31
- 238000004891 communication Methods 0.000 claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000007665 sagging Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
Landscapes
- 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 kind of power network energy-storage system, including multiple battery modules, battery module to include：Lithium battery,DC/DC converters,All DC/DC converters access dc bus, which are formed, to be connected in parallel,Automatic current sharing control module is connected between the DC/DC converters,Communication module is connected between DC/DC converters in invention,Droop control unit or other automatic current sharing control modules,Ensure DC/DC converters can be operated in with/without under the conditions of communication module from equal stream mode,Automatic current sharing control module can also be connected with middle-position machine,Realize the orderly charge and discharge mode work of lithium battery,Also remote monitoring is realized using remote control terminal,The present invention flows suitable for a variety of,Charge/discharge operation state,Dynamic property significantly improves,It is also adapted to battery pack and " different battery charge states " occurs," different power of battery grades ",Different situations such as " individual module failures ",It is easily achieved complex energy scheduling strategy and improves the dynamic property of power network energy-storage system.
Description
Technical field
Applied in groups the present invention relates to power lithium-ion battery and power energy storage field, specially one kind are applied to multiple
The power network energy-storage system of DC/DC converters.
Background technology
A battery energy storage part indispensable in being used as new energy, it develops the development for also contributing to new energy.
With the continuous expansion of China's net capacity, peak-valley difference is continuously increased, regenerative resource, distributed energy supply and intelligent grid it is fluffy
The exhibition of breaking out, the demand of extensive development battery energy storage technology is increasingly increased.However, battery group technology turns into the big rule of energy storage
The technical bottleneck of mould development.
The lithium battery of multiple different conditions is directly used in parallel to be caused the abnormal flowing of power and battery is caused to damage
It is bad, by forming a system with being connected in parallel again after lithium battery one DC/DC converting means of series connection to every piece of power energy storage,
Every battery branch road forms current inner loop closed-loop control under the control of DC/DC converting means, and all branch circuit parallel connections lead to together
Cross and control the electric current of each branch road to export to form outer voltage closed-loop control so as to stablize external constant pressure, such system is called simultaneously
Net lithium battery system.
The core parameter of battery grouping method is the connection in series-parallel quantity of battery, it is well known that the more batteries of quantity in parallel hold
Amount is bigger, and serial number is more, and battery total voltage is bigger.The common assembled battery total voltage of power energy storage is 48V, 60V and 96V etc.
Voltage class, these voltage class are all based on traditional lead acid batteries.In recent years, lithium battery applications are gradually promoted, lithium battery group
Voltage class for energy storage has 48V, and 60V is until more than 500V.Because lithium ion battery cannot be as lead-acid battery group floating charge
Equilibrium, cause the voltage of lithium-ion battery monomer in the higher battery pack of series voltage inconsistent more serious, but 48V and 60V etc.
The power network stored energy capacitance that the lithium battery group of voltage class can provide is extremely limited.Consult data of literatures, current seldom pin
The scheme grid-connected to more DC/DC converters parallel connection lithium batteries of 48V and 60V this voltage class proposes.It is proposed by the present invention more
It is unanimously balanced that the operational mode of DC/DC converters lithium battery grouping method in parallel is easily achieved voltage, energy scheduling strategy compared with
To be flexible.
The content of the invention
It is an object of the invention to provide a kind of power network energy-storage system, meets battery pack temperature, equilibrium, power and the reality in life-span
Border demand, in order to achieve the above object, the technical solution adopted in the present invention is：Including multiple battery modules, each battery mould
Block includes：Lithium battery, the DC/DC converters being connected with lithium battery, all DC/DC converters are respectively connected to dc bus and formed
It is connected in parallel, automatic current sharing control module is connected between the DC/DC converters.
Preferably, the automatic current sharing control module can be communication module.
Preferably, the automatic current sharing control module can use droop control unit.
Preferably, the automatic current sharing control module can be connected with middle-position machine.
Preferably, the automatic current sharing control module can be connected with middle-position machine, the middle-position machine can with it is long-range
Control terminal connects.
Preferably, the optional different capacity grade of the specification of the multiple battery module.
Preferably, the lithium battery energy storage battery is of different sizes and DC/DC inverter powers grade is different.
Preferably, the communication module can use CAN communication mode.
Preferably, the droop control unit can be the droop control device based on equalizing control circuit.
The beneficial effect of the present invention compared with prior art：
Communication module, droop control unit or other automatic current sharing control moulds are connected between DC/DC converters in the present invention
Block, ensure DC/DC converters can be operated in with/without under the conditions of communication module from equal stream mode, can also be by autonomous equalizing current
Control module is connected with middle-position machine, realizes the orderly charge and discharge mode work having under the conditions of middle-position machine, can also be utilized and middle position
The remote control terminal of machine connection realizes remote monitoring, and the present invention is applied to a variety of stream, charge/discharge operation state, dynamic properties and shown
Write and improve, the present invention is also adapted to battery pack and " different battery charge states ", " different power of battery grades ", " individual module event occurs
The different situations such as barrier ", it is easy to accomplish complex energy scheduling strategy simultaneously improves the dynamic property of power network energy-storage system.
Brief description of the drawings
Fig. 1 is designed more DC/DC converters parallel connection lithium battery energy storage battery topological diagrams；
Fig. 2 is the more equal flow diagrams of DC/DC converters for having communication module；
Fig. 3 is more equal flow diagrams of DC/DC converters without communication module；
Fig. 4 is the more equal flow diagrams of DC/DC converters for having middle-position machine to control；
Fig. 5 is the dynamic power dispatch situation of different battery charge states, and wherein shaded area represents battery lotus size；
Fig. 6 is the dynamic power dispatch situation of different power of battery grades, and wherein battery sizes are different represents power of battery grade
It is different；
Fig. 7 is the dynamic power dispatch situation of individual module failure, wherein, the representative for occurring lightning mark in battery is broken down
Battery；
In figure, 1, dc bus；2nd, battery module；3rd, DC/DC converters；4th, lithium battery；
5th, automatic current sharing control module；6th, middle-position machine；7th, remote control terminal.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, done with reference to once specific data
It is further to describe in detail.Here, the schematic example of the present invention is used to explain the present invention, but it is not intended as the limit to the present invention
It is fixed.
Understand as shown in Figure 1, the present invention includes multiple battery modules 2, and each battery module 2 includes：Lithium battery 4, with
The DC/DC converters 3 that lithium battery 4 connects, all DC/DC converters 3 are respectively connected to the formation of dc bus 1 and are connected in parallel.
Automatic current sharing control module 5 is connected between DC/DC converters 3, is understood as shown in Figure 2, the autonomous equalizing current
5 preferred communication module of control module, the communication module can use CAN communication mode, and sharing control strategy can be according to CAN
Communication transmits data dynamic and changed.
Described in Fig. 3, it is known that it is the preferred droop control unit of the automatic current sharing control module 5, the sagging control
Unit processed can be the droop control device based on equalizing control circuit, and droop control unit reads the DC/DC converters 3 of its control
Output current, change the output of DC/DC converters 3 according to a sagging curve being made up of output current and output voltage
Voltage.When more battery modules 2 are in parallel, although the actual parameter of each battery module 2 is less consistent, make its output current and voltage
Difference, but due to the presence of droop characteristic, by the adjustment of droop control device, the output current of each battery module 2 and defeated
Respective sagging curve can be met by going out voltage, and its final output voltage is consistent, and output current is then according to its lower whip
Line determines.After the sagging curve of setting is corrected according to physical device parameter, each 2 sagging parameter of battery module is identical
When, the size of its output current also will be identical, is flowed so as to realize.The method need not establish battery module 2 and battery module 2 it
Between communication, under conditions of without communication module, can directly according to the output of the voltage dynamic adjusting module on dc bus 1,
Can change overall output although voltage is sagging, actual use in the voltage pulsation of dc bus 1 in certain scope when be
System can receive.
In scheme provided by the present invention, battery module 2 also has autonomous decision charge-discharge energy scheduling strategy, using figure
The stream operation control method for having the equipment of middle-position machine 6 shown in 4, automatic current sharing control module 5 is connected with middle-position machine 6, each
Respective information is sent to middle-position machine 6 and carries out parameter calculating and analysis of strategies by battery module 2, if power energy storage external load needs
Ask the fluctuation of the energy state of fluctuation or lithium battery 4 to generate strategy and have a great influence to middle-position machine 6, middle-position machine 6 issue current-order or
Power instruction gives each DC/DC converters 3, similar with the effect that the DC/DC converters 3 shown in Fig. 2 independently communicate.
As shown in figure 4, automatic current sharing control module 5 can be connected with middle-position machine 6, the middle-position machine 6 can be with long-range control
End connection processed, meet the remote control requirements of actual user.
, it is known that the stored energy capacitance of the module 2 of the voltage class such as 48V and 60V lithium battery 4 can select between 20Ah to 400Ah
Select, the energy range of individual module between 1kWh to 20kWh, the power bracket of single battery module 2 500W to 10kW it
Between.
Because the uniformity of the module 2 of the voltage class such as 48V and 60V lithium battery 4 is higher, can not be examined in the module 2 of lithium battery 4
Consider battery balanced, if whether balanced the protection board for additionally depending on inside or battery management system contain equilibrium in battery module 2
Function, but need to consider equilibrium between battery module 2.
There are different battery charge states in lithium battery 4 in Fig. 5, and it is due to that incomplete normal operation is led this state occur
Cause, the reason for this is that：As a result of Fig. 1 topological structure, battery module 2 can independently determine the charging and discharging currents of itself,
In order to which the needs tested, safeguard, maintained regularly can also be corrected and detect to own module parameter, therefore lithium battery 4
The charging state of different battery modules 2 in energy-storage system shown in meeting generally existing Fig. 5.
When there is the situation shown in Fig. 5, due to being connected with automatic current sharing control module 5 between DC/DC converters 3, really
Saying for cutting is communicated using CAN, allows battery module 2 electric according to the border discharge and recharge of itself current charging state using this
Stream mutually communication, whole system independently determine the contribution to load current.
Fig. 6 shows the energy dispatch situation with different capacity grade between multiple battery modules 2, different capacity grade
Refer to the lithium battery 4 of different energy storage sizes and the DC/DC converters 3 of different capacity grade, the different power grades of battery module 2 are
In order to allow 4 groups of active downratings of lithium battery of long-term high power operation, the reason for dropping power, mainly there is two, is on the one hand
Because the interior temperature distribution of battery module 2 is uneven after continuous high power operation, drop power is advantageous to the uniform of thermo parameters method；Separately
On the one hand it is because low current discharge and recharge is easy to judge inside battery parameter state, is advantageous to accurately determine battery balanced capacity
With the parameter information of battery module 2, the utilization of Fig. 6 different capacity grade energy scheduling strategy is for improving whole technical scheme
Dynamic property and cycle life.
System capacity dispatch situation when Fig. 7 shows certain branch trouble of battery module 2 or needs to safeguard, shown in Fig. 1
More DC/DC converters 3 topological structure in parallel can meet the reliable uninterrupted operation of whole battery pack, even if there is some branch road
Battery module 2 breaks down or needs to safeguard, simultaneously because we have selected the module of lithium battery 4 of the voltage class such as 48V or 60V
2, the energy contained by single branch road is relatively limited, more flexible compared to the branch road of lithium battery 4 of 500V voltage class.Although in parallel
Branch road increase, but the reliability of whole system significantly increases.
Integrated cost and reliability factor, more DC/DC converters 3 proposed by the present invention grouping method of lithium battery 4 in parallel
Dynamic characteristic is significantly improved, and corresponding parameter correction, parameter detecting and dynamic power can be embedded in the mode of operation of multiple branch circuit
The function of scheduling, while network load characteristic is can be combined with, the charge and discharge strategy under the complicated space-time condition of energy is realized, comprehensively
Meet battery pack temperature, equilibrium, power and the actual demand in life-span, the mould of progress and battery energy storage beneficial to battery energy storage technology
Blockization is fast-developing.
Claims (9)
1. a kind of power network energy-storage system, including multiple battery modules, each battery module include：Lithium battery and lithium battery connect
The DC/DC converters connect, it is characterised in that：All DC/DC converters are respectively connected to dc bus formation and are connected in parallel, described
Automatic current sharing control module is connected between DC/DC converters.
A kind of 2. power network energy-storage system according to claim 1, it is characterised in that：The automatic current sharing control module can be with
For communication module.
A kind of 3. power network energy-storage system according to claim 1, it is characterised in that：The automatic current sharing control module can be with
Using droop control unit.
A kind of 4. power network energy-storage system according to claim 2, it is characterised in that：The automatic current sharing control module can be with
It is connected with middle-position machine.
A kind of 5. power network energy-storage system according to claim 2, it is characterised in that：The automatic current sharing control module can be with
It is connected with middle-position machine, the middle-position machine can be connected with remote control terminal.
A kind of 6. power network energy-storage system according to claim 1,2,4 or 5, it is characterised in that：The multiple battery module
The optional different capacity grade of specification.
A kind of 7. power network energy-storage system according to claim 6, it is characterised in that：The lithium battery energy storage battery it is of different sizes and
DC/DC inverter powers grade is different.
A kind of 8. power network energy-storage system according to claim 2,4 or 5, it is characterised in that：The communication module can use
CAN communication mode.
A kind of 9. power network energy-storage system according to claim 3, it is characterised in that：The droop control unit can be base
In the droop control device of equalizing control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610598673.0A CN107666147A (en) | 2016-07-27 | 2016-07-27 | A kind of power network energy-storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610598673.0A CN107666147A (en) | 2016-07-27 | 2016-07-27 | A kind of power network energy-storage system |
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| Publication Number | Publication Date |
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| CN107666147A true CN107666147A (en) | 2018-02-06 |
Family
ID=61115021
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610598673.0A Pending CN107666147A (en) | 2016-07-27 | 2016-07-27 | A kind of power network energy-storage system |
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| CN (1) | CN107666147A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993418A (en) * | 2019-12-18 | 2021-06-18 | 比亚迪股份有限公司 | Energy storage system |
| EP4175113A4 (en) * | 2020-06-30 | 2024-01-10 | Byd Co Ltd | Charging and discharging system |
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| EP4175113A4 (en) * | 2020-06-30 | 2024-01-10 | Byd Co Ltd | Charging and discharging system |
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