CN109742782A - A kind of device and method utilized suitable for retired power battery echelon - Google Patents
A kind of device and method utilized suitable for retired power battery echelon Download PDFInfo
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- CN109742782A CN109742782A CN201910111823.4A CN201910111823A CN109742782A CN 109742782 A CN109742782 A CN 109742782A CN 201910111823 A CN201910111823 A CN 201910111823A CN 109742782 A CN109742782 A CN 109742782A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 49
- 230000002441 reversible effect Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 230000010363 phase shift Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- KLDZYURQCUYZBL-UHFFFAOYSA-N 2-[3-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCN=CC1=CC=CC=C1O KLDZYURQCUYZBL-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 208000033921 delayed sleep phase type circadian rhythm sleep disease Diseases 0.000 description 1
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Abstract
The present invention relates to a kind of device and method utilized suitable for retired power battery echelon, which includes: three-phase Cascade Topology Structure structure, and each phase includes the multiple power conversion modules being connected in series；Each power conversion modules include AC/DC power conversion unit and retired electrokinetic cell system；The retired electrokinetic cell system is in parallel with AC/DC power conversion unit；When detecting that the retired electrokinetic cell system is in imbalance, the AC/DC power conversion unit adjusts the voltage value of the retired electrokinetic cell system, so that the retired electrokinetic cell system reaches balanced.Technical solution of the present invention is by Cascade Topology Structure structure, while avoiding retired battery pack or mould group is series-parallel on a large scale, realizes the energy-storage system of larger capacity and power, greatly expands the application range that retired battery echelon utilizes.
Description
Technical field
The invention belongs to field of batteries more particularly to a kind of device utilized suitable for retired power battery echelon and sides
Method.
Background technique
With the fast development of power vehicle, retired power battery also increasingly increases, and power battery is at present with lithium battery
Based on, the active volume of the retired power battery to get off usually still remaining 70% to 80% directly scraps waste of resource very
Unfortunately, and the recycling of lithium battery is different from lead plumbate carbon battery, and recovery value is not high, but the cost recycled is very high.
Currently, retired battery is mainly used for energy storage, but due to the voltage class, residual capacity and material of retired battery
Expect the difference of type, retired battery cannot be directly used in energy-storage system as new battery, less can be carried out large-scale string simultaneously
Connection uses.
Accordingly, it is desirable to provide a kind of device and method utilized suitable for retired power battery echelon solves the prior art
Deficiency.
Summary of the invention
In order to solve the problems in the prior art, it utilizes the present invention provides a kind of suitable for retired power battery echelon
Device and method.
A kind of device utilized suitable for retired power battery echelon, comprising: three-phase Cascade Topology Structure structure, it is each mutually equal
Multiple power conversion modules including series connection；
Each power conversion modules include AC/DC power conversion unit and retired electrokinetic cell system；
The retired electrokinetic cell system is in parallel with AC/DC power conversion unit；
When detecting that the retired electrokinetic cell system is in imbalance, the AC/DC power conversion unit tune
The voltage value of the whole retired electrokinetic cell system, so that the retired electrokinetic cell system reaches balanced.
Further, further includes: each phase of filter, the three-phase Cascade Topology Structure structure passes through the filter
It is connected to power grid.
Further, the retired electrokinetic cell system includes retired power battery pack or retired power battery module, institute
It states retired power battery pack and the retired power battery module includes retired power battery management module and multiple concatenated
Single battery.
Further, the power conversion modules further include: DC/DC reversible transducer, the DC/DC reversible transducer with
The retired electrokinetic cell system is in parallel, for adjusting the voltage of the retired electrokinetic cell system.
Further, the three-phase Cascade Topology Structure structure is triangle topology structure or stelliform connection topology configuration.
A method of it is utilized suitable for retired power battery echelon, comprising:
By retired electrokinetic cell system formation power conversion modules in parallel with AC/DC power conversion unit；
Multiple power conversion modules are connected any phase to be formed in three-phase Cascade Topology Structure structure；
Whether balanced detect the retired electrokinetic cell system；
If detect that the retired electrokinetic cell system is unbalanced, adjusted by AC/DC power conversion unit retired
The voltage value of electrokinetic cell system.
Further, the retired electrokinetic cell system includes retired power battery pack or retired power battery module, institute
It states retired power battery pack and the retired power battery module includes retired power battery management module and multiple concatenated
Single battery.
Further, whether the detection retired electrokinetic cell system is balanced, comprising:
Acquire the state-of-charge and voltage of the retired electrokinetic cell system in every phase of the three-phase Cascade Topology Structure structure
Value；
According to the state-of-charge and voltage value of the retired electrokinetic cell system, the electricity of each retired electrokinetic cell system is obtained
Press deviation and state-of-charge deviation；
Judge whether the state-of-charge deviation is greater than the first state-of-charge deviation threshold；
If the state-of-charge deviation is greater than the first state-of-charge deviation threshold, then the retired power is determined
Battery system is unbalanced.
Technical solution provided by the invention has the advantages that compared with the immediate prior art
Technical solution provided by the invention is detecting retired electrokinetic cell system in not by Cascade Topology Structure structure
When equilibrium state, the voltage value of retired electrokinetic cell system is adjusted by AC/DC power conversion unit, so that retired power electric
Pond reaches balanced.Technical solution provided by the invention is real while avoiding retired battery pack or mould group is series-parallel on a large scale
The energy-storage system of existing larger capacity and power, greatly expands the application range that retired battery echelon utilizes.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of star-like connection in the embodiment of the present invention；
Fig. 2 is intermediate cam shape of embodiment of the present invention connection topological structure schematic diagram；
Fig. 3 is the composition schematic diagram of power conversion modules in the embodiment of the present invention；
Fig. 4 is phase shift carrier wave SPWM modulation method schematic diagram in the embodiment of the present invention；
Fig. 5 is that adaptive voltage control and SOC balance control overall-in-one control schema schematic diagram in the embodiment of the present invention；
Fig. 6 is method flow diagram in the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the invention provides a kind of device utilized suitable for retired power battery echelon, the dress
Setting includes: three-phase Cascade Topology Structure structure, and each phase includes the multiple power conversion modules being connected in series；
Each power conversion modules include AC/DC power conversion unit and retired electrokinetic cell system, such as Fig. 3 institute
Show；
The retired electrokinetic cell system is in parallel with AC/DC power conversion unit；
When detecting that the retired electrokinetic cell system is in imbalance, the AC/DC power conversion unit tune
The voltage value of the whole retired electrokinetic cell system, so that the retired electrokinetic cell system reaches balanced.
In the embodiment of the present application, by Cascade Topology Structure structure, detecting retired electrokinetic cell system in unevenness
When weighing apparatus state, the voltage value of retired electrokinetic cell system is adjusted by AC/DC power conversion unit, so that retired power battery
System reaches balanced.Technical solution provided by the invention while avoiding retired battery pack or mould group is series-parallel on a large scale,
The energy-storage system for realizing larger capacity and power, greatly expands the application range that retired battery echelon utilizes.
Device uses three-phase Cascade Topology Structure structure, and each phase is made of several power conversion units, each power
One end of converter unit is connected to a retired power battery pack or battery modules, retired power battery pack and described retired
Power battery module includes retired power battery management module and multiple concatenated single batteries；Power conversion unit it is another
End is connect with adjacent power conversion unit, and each phase can all form the chain link of a power conversion unit；
It can be delta connection (as shown in Figure 2) between three-phase and be also possible to wye connection (as shown in Figure 1)；Three-phase chain
Section is accessed among electric system after connecting by reactor, LCL filter or LC filter,
Complete energy storage device in a structure can be thus formed, peak load shifting, demand charge pipe can be played
The effect of the energy-storage systems such as reason, smooth load curve, by retired power battery, echelon is utilized well.
It is isolated from each other between the power cell of the device, can be compatible with very well different voltages etc. with independent control, therefore
Grade, difference SOC (State of Charge, state-of-charge), even different lithium battery types retired power battery；And
The output and biggish power capacity and battery capacity of a variety of different voltages grades may be implemented in the topological structure of tandem type
Single machine energy-storage system, maximum possible avoid the used in parallel of energy-storage system.
In some embodiments of the present application, the device further include: DC/DC reversible transducer, the DC/DC two-way changing
Device is in parallel with the retired electrokinetic cell system, for adjusting the voltage of the retired electrokinetic cell system.
In some embodiments of the present application, the device further include: filter, each phase of three-phase Cascade Topology Structure structure
Power grid is connected to by the filter.
Filter is for filtering out the clutter in power grid.
For the stable output and compatible different voltages grade, the retired battery pack or battery of difference SOC for guaranteeing single unit system
Mould group, the present invention also provides a kind of method utilized suitable for retired power battery echelon, this method is applied to above-mentioned be applicable in
In the device that retired power battery echelon utilizes, as shown in fig. 6, this method comprises:
By retired electrokinetic cell system formation power conversion modules in parallel with AC/DC power conversion unit；
Multiple power conversion modules are connected any phase to be formed in three-phase Cascade Topology Structure structure；
Whether balanced detect the retired electrokinetic cell system；
If detect that the retired electrokinetic cell system is unbalanced, adjusted by AC/DC power conversion unit retired
The voltage value of electrokinetic cell system.
In the embodiment of the present application, by Cascade Topology Structure structure, detecting retired electrokinetic cell system in unevenness
When weighing apparatus state, the voltage value of retired electrokinetic cell system is adjusted by AC/DC power conversion unit, so that retired power battery
Reach balanced.Technical solution provided by the invention is realized while avoiding retired battery pack or mould group is series-parallel on a large scale
The energy-storage system of larger capacity and power greatly expands the application range that retired battery echelon utilizes.
In some embodiments of the present application, retired electrokinetic cell system includes retired power battery pack or retired power electric
Chi Mo group, the retired power battery pack and the retired power battery module include retired power battery management module and more
A concatenated single battery.
In some embodiments of the present application, whether balanced the retired electrokinetic cell system is detected, comprising:
Acquire the state-of-charge and voltage of the retired electrokinetic cell system in every phase of the three-phase Cascade Topology Structure structure
Value；
According to the state-of-charge and voltage value of the retired electrokinetic cell system, the electricity of each retired electrokinetic cell system is obtained
Press deviation and state-of-charge deviation；
Judge whether the state-of-charge deviation is greater than the first state-of-charge deviation threshold；
If the state-of-charge deviation is greater than the first state-of-charge deviation threshold, then the retired power is determined
Battery system is unbalanced.
The basic principle of this method is as follows:
Firstly, for Cascade Topology Structure, using the basic modulation system of phase-shifted SPWM, as shown in Figure 4, wherein carry
The basic principle of wave phase shift SPWM modulator approach is, to the phase chain in the energy storage device of n power conversion unit module composition
Section, each power conversion unit module all use the SPWM modulator approach compared with low switching frequency, each power conversion unit module
The same modulating wave is all used first,
Then be modulated respectively with n triangular carrier, each triangular carrier frequency having the same and amplitude, but phase according to
The fixed angle of secondary difference, certain angle so that the SPWM pulse for exporting each power conversion unit is staggered, after superposition
Equivalent switching frequency greatly increases,
As soon as the waveform of resulting device output be more than level staircase waveform, select suitable phase shift angle that can to export
The harmonic content of voltage greatly reduces.The echelon being modulated using phase shift SPWM modulation technique is using energy storage device, and three-phase is just
String successively differs 120 °, and the variation of every phase each unit carrier wave is for example above-mentioned.
On the basis of phase-shifted SPWM, it has been superimposed adaptive voltage control strategy and SOC balance control strategy, has such as been schemed
Shown in 5, the device of the invention is allowed to be compatible with different voltages grade and the retired battery pack or mould group of SOC.Implementation step
It is as follows:
Voltage value U when each battery pack SOC is the median of some setting in every phase is acquired firsti；
Then average voltage is calculatedWherein, n is the power conversion unit or battery pack/mould group of every phase
Number, then obtain the voltage deviation Δ U of each battery packi=Ui-U；
Again by voltage deviation value Δ UiMultiplied by a coefficient k, the voltage control signal U for each power conversion unit that is added to*
In；
At the same time, the SOC average value of each battery pack or mould group in every phase is calculatedAgain
Obtain the deviation of the SOC of each battery pack or mould group in every phase
Then SOC deviation Δ SOC is multiplied by another coefficient η, then each power conversion unit voltage that is equally added to
Control signal U*In.
Wherein, coefficient k is greater than coefficient η.In addition, the self adaptive control of voltage needs the period periodically set every one
To acquire voltage value U when each battery pack SOC is the median of some setting in primary every phasei, to distribute each unit
Component of voltage；The starting and termination of SOC balance control have two different SOC deviation threshold Δ SOC of settingESWith Δ SOCEE, electricity
The SOC and deviation Δ SOC real-time detection of Chi Bao or mould group, once there is the maximum value Δ SOC in deviation Δ SOCmax>
ΔSOCES, then start SOC balance control, until Δ SOCmax<ΔSOCEEWhen Balance route stop, until Δ SOC next timemax>
ΔSOCESIt is just again started up Balance route, wherein Δ SOCES>ΔSOCEE。
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.
It is understood that embodiments described herein can with hardware, software, firmware, middleware, microcode or its
Combination is to realize.For hardware realization, processing unit be may be implemented in one or more specific integrated circuit (Application
Specific Integrated Circuits, ASIC), digital signal processor (Digital Signal Processing,
DSP), digital signal processing appts (DSP Device, DSPD), programmable logic device (Programmable
LogicDevice, PLD), field programmable gate array (Field-Programmable Gate Array, FPGA), general place
It manages in device, controller, microcontroller, microprocessor, other electronic units for executing herein described function or combinations thereof.
For software implementations, the techniques described herein can be realized by executing the unit of function described herein.Software generation
Code is storable in memory and is executed by processor.Memory can in the processor or portion realizes outside the processor.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit
It connects, can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the embodiment of the present invention is substantially
The part of the part that contributes to existing technology or the technical solution can embody in the form of software products in other words
Come, which is stored in a storage medium, including some instructions are used so that a computer equipment (can
To be personal computer, server or the network equipment etc.) execute all or part of each embodiment the method for the present invention
Step.And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, ROM, RAM, magnetic or disk etc. are various can store program
The medium of code.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (8)
1. a kind of device utilized suitable for retired power battery echelon characterized by comprising three-phase Cascade Topology Structure knot
Structure, each phase include the multiple power conversion modules being connected in series；
Each power conversion modules include AC/DC power conversion unit and retired electrokinetic cell system；
The retired electrokinetic cell system is in parallel with AC/DC power conversion unit；
When detecting that the retired electrokinetic cell system is in imbalance, the AC/DC power conversion unit adjusts institute
The voltage value of retired electrokinetic cell system is stated, so that the retired electrokinetic cell system reaches balanced.
2. a kind of device utilized suitable for retired power battery echelon according to claim 1, which is characterized in that also wrap
Include: filter, each phase of the three-phase Cascade Topology Structure structure pass through the filter and are connected to power grid.
3. a kind of device utilized suitable for retired power battery echelon according to claim 1, which is characterized in that described
Retired electrokinetic cell system includes retired power battery pack or retired power battery module, the retired power battery pack and described
Retired power battery module includes retired power battery management module and multiple concatenated single batteries.
4. a kind of device utilized suitable for retired power battery echelon according to claim 1, which is characterized in that described
Power conversion modules further include: DC/DC reversible transducer, the DC/DC reversible transducer and the retired electrokinetic cell system
Parallel connection, for adjusting the voltage of the retired electrokinetic cell system.
5. a kind of device utilized suitable for retired power battery echelon according to claim 1, which is characterized in that described
Three-phase Cascade Topology Structure structure is triangle topology structure or stelliform connection topology configuration.
6. a kind of method utilized suitable for retired power battery echelon characterized by comprising
By retired electrokinetic cell system formation power conversion modules in parallel with AC/DC power conversion unit；
Multiple power conversion modules are connected any phase to be formed in three-phase Cascade Topology Structure structure；
Whether balanced detect the retired electrokinetic cell system；
If detect that the retired electrokinetic cell system is unbalanced, retired power is adjusted by AC/DC power conversion unit
The voltage value of battery system.
7. a kind of method utilized suitable for retired power battery echelon according to claim 6, which is characterized in that described
Retired electrokinetic cell system includes retired power battery pack or retired power battery module, the retired power battery pack and described
Retired power battery module includes retired power battery management module and multiple concatenated single batteries.
8. a kind of method utilized suitable for retired power battery echelon according to claim 6, which is characterized in that described
Whether balanced detect the retired electrokinetic cell system, comprising:
Acquire the state-of-charge and voltage value of the retired electrokinetic cell system in every phase of the three-phase Cascade Topology Structure structure；
According to the state-of-charge and voltage value of the retired electrokinetic cell system, the voltage for obtaining each retired electrokinetic cell system is inclined
Difference and state-of-charge deviation；
Judge whether the state-of-charge deviation is greater than the first state-of-charge deviation threshold；
If the state-of-charge deviation is greater than the first state-of-charge deviation threshold, then the retired power battery is determined
System is unbalanced.
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| CN110518667A (en) * | 2019-09-05 | 2019-11-29 | 山东省科学院自动化研究所 | A kind of echelon utilizes battery parallel system and its control method |
| CN110994659A (en) * | 2019-12-27 | 2020-04-10 | 广东电网有限责任公司电力科学研究院 | Energy storage system series droop control method and system |
| CN112186821A (en) * | 2019-07-04 | 2021-01-05 | 北京德意新能科技有限公司 | Echelon utilization device and control algorithm applied to electric automobile retired battery |
| CN113054713A (en) * | 2021-04-06 | 2021-06-29 | 广州智光电气技术有限公司 | Echelon utilization method and device for retired battery |
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| CN112186821B (en) * | 2019-07-04 | 2022-07-26 | 北京德意新能科技有限公司 | Echelon utilization device and control algorithm applied to electric automobile retired battery |
| CN110518667A (en) * | 2019-09-05 | 2019-11-29 | 山东省科学院自动化研究所 | A kind of echelon utilizes battery parallel system and its control method |
| CN110994659A (en) * | 2019-12-27 | 2020-04-10 | 广东电网有限责任公司电力科学研究院 | Energy storage system series droop control method and system |
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