CN108819747B - Multi-branch power distribution management for multi-branch energy storage system - Google Patents

Multi-branch power distribution management for multi-branch energy storage system Download PDF

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CN108819747B
CN108819747B CN201810606181.0A CN201810606181A CN108819747B CN 108819747 B CN108819747 B CN 108819747B CN 201810606181 A CN201810606181 A CN 201810606181A CN 108819747 B CN108819747 B CN 108819747B
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CN108819747A (en
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赵金程
马骏
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NIO Holding Co Ltd
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NIO Anhui Holding Co Ltd
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    • H02J7/042—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
    • H02J7/0021—
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to multi-branch power distribution management of a multi-branch energy storage system, belonging to the technical field of energy storage system control. The invention discloses a multi-branch power distribution management device for a multi-branch energy storage system, which comprises: a life cycle management unit for determining whether to preferentially charge/discharge with a branch having a relatively large SOH according to a degree of difference in SOH between energy packets of the plurality of branches; and/or an energy balance management unit, which is used for determining the charging/discharging priority of each branch circuit based on the SOH and the SOC of the energy packet corresponding to the branch circuit. According to the invention, SOH of energy packets of all branches can be more and more consistent through life cycle management, and energy balance of each branch can be rapidly realized in the charging and discharging process through energy balance management, so that overuse or over-charging and over-discharging of a certain branch can be avoided.

Description

Multi-branch power distribution management for multi-branch energy storage system
Technical Field
The invention belongs to the technical field of energy storage system control, and relates to a multi-branch power distribution management device and a multi-branch power distribution management method for a multi-branch energy storage system.
Background
In the multi-branch energy storage system, each branch is correspondingly provided with a corresponding energy packet (such as a battery), and a plurality of branches can be charged and discharged together, so that power distribution management is performed in the charging/discharging process.
For the energy packet of each branch, the state of the energy packet can be represented by SOC, SOH and the like, and the energy packet can be easily collected and obtained even if the state of the energy packet changes dynamically.
An SOC (State of Charge) that represents a State of Charge of an energy pack such as a battery and also reflects a remaining amount of electricity of the energy pack such as the battery; SOC is usually expressed by a ratio of a remaining capacity of an energy pack such as a battery to a capacity of a fully charged state thereof, for example, expressed in percentage, and has a value range of 0 to 1; when SOC =0, it indicates that the energy pack such as a battery is completely discharged, and when SOC =1, it indicates that the energy pack such as a battery is completely charged.
SOH (State of Health), which represents the Health of an energy pack such as a battery, and which reflects the State of life of the energy pack such as a battery; the SOH of an energy pack such as a battery can be represented by a ratio of a capacity discharged by discharging the energy pack from a full charge state to a cut-off voltage at a shift rate under a standard condition to a standard capacity corresponding thereto.
There is a great difficulty in power distribution management of multi-branch energy storage systems where the energy packets of each branch have large differences in SOH.
Disclosure of Invention
According to a first aspect of the present invention, there is provided a multi-branch power distribution management apparatus for a multi-branch energy storage system, comprising:
a life cycle management unit for determining whether to preferentially charge/discharge with a branch having a relatively large SOH according to a degree of difference in SOH between energy packets of the plurality of branches; and/or
And the energy balance management unit is used for determining the charging/discharging priority of each branch circuit based on the SOH and the SOC of the energy packet corresponding to the branch circuit.
The multi-branch power distribution management apparatus according to an embodiment of the present invention, wherein,
the life cycle management unit is further used for enabling the difference degree of the state of health SOH among the energy packets of the plurality of branches to exceed a preset allowable value delta SOHmaxThe control preferentially utilizes the branch with relatively large SOH to charge/discharge;
the energy balance management unit is also used for ensuring that the difference degree of the SOH among the energy packets of the plurality of branches does not exceed a preset allowable value delta SOHmaxThe charging/discharging priority of each branch is determined based on the SOH and the state of charge SOC of the energy packet corresponding to the branch.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the degree of difference in state of health SOH between the energy packets of the plurality of branches is represented by a first difference Δ SOH between a maximum SOH and a minimum SOH of the energy packets of the plurality of branches.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the lifecycle management unit includes:
an SOH difference calculation module for calculating the first difference Δ SOH;
a judging module for judging whether the first difference value Δ SOH exceeds the predetermined allowable value Δ SOHmax(ii) a And
a first priority determining module for determining whether the predetermined allowable value Δ SOH is exceededmaxThe first priority of charging/discharging is determined in turn from large to small according to the SOH size of the energy packets of the plurality of branches.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the multi-branch power distribution management apparatus is further configured to: total power available for charging P at the energy storage systemchgDirectly controlling the energy packets of the plurality of branches to charge with the same priority level under the condition that the maximum allowable total charging power of the plurality of branches is greater than; and/or
Total power P of discharge demand in the energy storage systemdischgAnd directly controlling the energy packets of the plurality of branches to discharge with the same priority level under the condition of more than the maximum allowable total discharge power of the plurality of branches.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the lifecycle management unit is further configured to exclude a branch corresponding to an energy packet from the plurality of branches to form a new plurality of branches if an SOH of one of all energy packets of the plurality of branches is less than or equal to a predetermined limit value.
According to the multi-branch power distribution management apparatus of another embodiment of the present invention or any of the above embodiments,wherein the predetermined allowable value Δ SOHmaxLess than or equal to 5%.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management unit further includes:
a priority index calculation module for calculating a charging priority index P corresponding to each branch based on the following formula (1):
　　　　　　　　　　　　　　　　P= SOC-λ×SOH （1）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
Figure 100002_DEST_PATH_IMAGE001
（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management unit further includes:
and the second priority determining module is used for sequentially determining the second priority of charging from small to large according to the charging priority index P.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management unit further includes:
a priority index calculation module for calculating a discharge priority index Q corresponding to each branch based on the following formula (3):
　　　　　　　　　　Q= SOC+λ×SOH （3）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
Figure 660929DEST_PATH_IMAGE002
（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management unit further includes:
and the second priority determining module is used for sequentially determining the second priority of the discharge from large to small according to the discharge priority index Q.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management unit is further configured to distribute the charge/discharge power according to the SOCs of the plurality of energy packets of the plurality of branches so that the SOCs of the plurality of energy packets tend to coincide when the difference between the charge priority index P/discharge priority index Q is less than or equal to a corresponding predetermined value.
The multi-branch power distribution management apparatus according to another embodiment of the present invention or any one of the above embodiments, wherein the energy pack is a power battery pack for use in an electric vehicle for echelon utilization.
According to a second aspect of the present invention, a multi-branch energy storage system is provided, which includes a plurality of branches, each branch having an energy pack, a power conversion module, a branch charging and discharging control module, and any one of the above multi-branch power distribution management devices.
The multi-branch energy storage system according to an embodiment of the present invention further includes:
and the human-computer interaction interface is coupled with the multi-branch power distribution management device and is used for displaying the running state information of the multi-branch energy storage system in the charging/discharging process.
According to a third aspect of the present invention, there is provided a multi-branch power distribution management method for a multi-branch energy storage system, comprising:
a life cycle management step: determining whether to preferentially utilize the branch with relatively large SOH for charging/discharging according to the difference degree of the SOH among the energy packets of the plurality of branches; and/or
Energy balance management: and determining the charging/discharging priority of each branch circuit based on the SOH and the SOC of the energy packet corresponding to each branch circuit.
According to an embodiment of the present invention, a multi-branch power distribution management method, wherein,
in the life cycle management step, the degree of difference in state of health SOH between the energy packets of the plurality of legs exceeds a predetermined allowable value Δ SOHmaxThe control preferentially utilizes the branch with relatively large SOH to charge/discharge;
in the energy balance management step, the degree of difference in SOH between the energy packets of the plurality of legs does not exceed a predetermined allowable value Δ SOHmaxThe charging/discharging priority of each branch is determined based on the SOH and the state of charge SOC of the energy packet corresponding to the branch.
The multi-branch power distribution management method according to another embodiment of the invention or any of the above embodiments, wherein the degree of difference in state of health SOH between the energy packets of the plurality of branches is represented by a first difference Δ SOH between a maximum SOH and a minimum SOH of the energy packets of the plurality of branches.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the lifecycle management step includes:
calculating the first difference value Δ SOH;
judging whether the first difference value Delta SOH exceeds the preset allowable value Delta SOH or notmax(ii) a And
when judged to exceed the predetermined allowable value Δ SOHmaxThe first priority of charging/discharging is determined in turn from large to small according to the SOH size of the energy packets of the plurality of branches.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, further comprising:
total power available for charging P at the energy storage systemchgDirectly controlling the energy packets of the plurality of branches to charge with the same priority level under the condition that the maximum allowable total charging power of the plurality of branches is greater than; and/or
Total power P of discharge demand in the energy storage systemdischgAnd directly controlling the energy packets of the plurality of branches to discharge with the same priority level under the condition of more than the maximum allowable total discharge power of the plurality of branches.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the lifecycle management step further includes:
and under the condition that the SOH of one energy packet of all the energy packets of the plurality of branches is less than or equal to a preset limit value, the branch corresponding to the energy packet is excluded from the plurality of branches to form a new plurality of branches.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the predetermined allowable value Δ SOHmaxLess than or equal to 5%.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management step further includes:
a priority index calculation sub-step: calculating a charging priority index P corresponding to each branch circuit based on the following formula (1):
　　　　　　　　　　　　　P= SOC-λ×SOH （1）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
Figure 225903DEST_PATH_IMAGE002
（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresenting the ith branchA difference between the SOH of the energy packet and a minimum SOH of the energy packets of the plurality of legs.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management step further includes:
second priority determination substep: and sequentially determining a second charging priority according to the charging priority index P from small to large.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management step further includes:
the priority index calculation substep: calculating a discharge priority index Q corresponding to each branch based on the following formula (3):
　　　　　　　　Q= SOC+λ×SOH （3）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
Figure DEST_PATH_IMAGE003
　 （2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management step further includes: second priority determination substep: and sequentially determining a second discharging priority according to the discharging priority indexes Q from large to small.
The multi-branch power distribution management method according to another embodiment of the present invention or any one of the above embodiments, wherein the energy balance management step further includes: distributing charge/discharge power according to the SOCs of all energy packets of the plurality of branches when the charge priority index P/discharge priority index Q is less than or equal to a corresponding predetermined value to make the SOCs of the plurality of energy packets tend to be uniform.
According to a fourth aspect of the present invention, there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor being capable of implementing the steps of any of the above multi-branch power distribution management methods when executing the program.
According to a fifth aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program executable by a processor to perform the steps of any of the above-described multi-branch power distribution management methods.
The above features and operation of the present invention will become more apparent from the following description and the accompanying drawings.
Drawings
The above and other objects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like or similar elements are designated by like reference numerals.
Fig. 1 is a schematic diagram of a multi-branch energy storage system according to an embodiment of the present invention, wherein a schematic structural diagram of a multi-branch power distribution management apparatus according to an embodiment of the present invention is shown.
Fig. 2 is a flow chart of a multi-branch power distribution management method according to an embodiment of the invention.
Fig. 3 is a flow chart of a multi-branch power distribution management method according to yet another embodiment of the invention.
Detailed Description
For the purposes of brevity and explanation, the principles of the present invention are described herein with reference primarily to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of multi-branch power distribution management apparatus and methods, and/or multi-branch energy storage systems using the same, and that these same principles may be implemented therein. Moreover, in the following description, reference is made to the accompanying drawings that illustrate certain exemplary embodiments. Electrical, mechanical, logical, and structural changes may be made to these embodiments without departing from the spirit and scope of the invention. In addition, while a feature of the invention may have been disclosed with respect to only one of several implementations/embodiments, such feature may be combined with one or more other features of the other implementations/embodiments as may be desired and/or advantageous for any given or identified function. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims and their equivalents.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are suitable, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviations found in their respective testing measurements. Moreover, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein. Where used, the terms "first," "second," and the like do not necessarily denote any order or priority relationship, but rather may be used to more clearly distinguish one element or time interval from another.
Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
Fig. 1 is a schematic diagram of a multi-branch energy storage system according to an embodiment of the present invention, in which a schematic structural diagram of a multi-branch power distribution management apparatus 200 according to an embodiment of the present invention is shown.
As shown in fig. 1, the multi-branch energy storage system 10 has a plurality of independent battery charging/discharging branches (hereinafter, referred to as "branches") 110, for example, N branches 1101、1102、…、110NWhere N ≧ 2, the specific size of N is not limiting, and N may even be dynamically variable for the multi-branch power distribution management device 200, such as after a particular branch 110 is eliminatedN will change accordingly.
Specifically, for each branch 110, it is provided with an energy pack 111, a power conversion module 112 and a branch charging and discharging control module 113; the power conversion module 112 may be a bidirectional AC/DC power module, and the branch charging and discharging control module 113 may charge and discharge a control board. The branch charging and discharging control module 113 of each branch 110 may receive an instruction from the multi-branch power distribution management device 200 so as to control the charging and discharging process of the energy packet 111 on the branch in real time, and of course, the branch charging and discharging control module 113 may also transmit the current state of charge SOC and the health degree SOH of the energy packet 111 to the branch power distribution management device 200; specifically, the branch charging and discharging control module 113 controls the input current or the output current of the dc side of the power conversion module 112 through communication, so as to control the actual charging and discharging current of the energy pack 111 on the branch, and meanwhile, obtains the real-time operation information of the corresponding power conversion module 112 through communication.
Specifically, each branch charging and discharging control module 113 can be implemented by a DSP, an ARM, or other single chip microcomputer chips; each of the branch charging and discharging control modules 113 may communicate with the BMS of the corresponding energy pack 111 to acquire a real-time information state of the energy pack 111 including SOC, SOH, etc. in real time. The branch charging and discharging control module 113 may also provide real-time charging and discharging alarm protection. Each branch charging and discharging control module 113 can also communicate with the multi-branch power distribution management device 200, so as to receive the unified coordination control and power distribution control of the multi-branch power distribution management device 200, and implement the life cycle management and energy balance management of the charging and discharging process, and meanwhile, each branch charging and discharging control module 113 can transmit the running state information to the multi-branch power distribution management device 200.
In an embodiment, the multi-branch energy storage system 10 may further be provided with a human-machine interface HMI310 coupled with the multi-branch power distribution management apparatus 200, the HMI310 displaying the operation status information of the multi-branch energy storage system 10 during the charging/discharging process; in another embodiment, the running state information sent by each branch charging and discharging control module 113 may be further sent to the cloud 320 or the server through the multi-branch power distribution management device 200.
The energy packs 111 in each branch circuit 110 may have different SOH and/or SOC, and particularly when the energy packs 111 adopt power battery packs on electric vehicles which are utilized in a gradient manner (for example, power batteries which are scrapped on the electric vehicles), the SOH difference is obvious, and it is very meaningful to continuously reduce the SOH difference of the energy packs during the use of the multi-branch energy storage system 10.
It should be noted that the specific type of the energy pack 111 or the specific state when applied in the energy storage system is not limiting.
Continuing with fig. 1, a multi-leg power distribution management apparatus 200 is used to implement power distribution management for N legs, including lifecycle management and/or energy balance management. The multi-branch power distribution management device 200 may be used as a main control board of the multi-branch energy storage system 10, and may be implemented by an ARM + HMI mode, or may be implemented by a computer device such as an industrial personal computer. The components of the multi-branch energy storage system 10 may communicate with each other, for example, in a CAN manner.
As further shown in fig. 1, the multi-branch power distribution management apparatus 200 is provided with a lifecycle management unit 210, and the lifecycle management unit 210 is used for managing the plurality of branches 1101-110NEnergy pack 1111-111NThe degree of difference between the state of health SOH exceeds a predetermined allowable value Δ SOHmaxIn the case of (2), the control preferentially performs charge/discharge using the branch 110 having a relatively large SOH.
Wherein the predetermined allowable value Δ SOHmaxEnergy pack 111 that may be used in accordance with energy storage system 101-111NThe degree of difference between the SOH values is preset, for example, it is generally less than or equal to 5%, so that the energy package 111 can be continuously applied to the energy storage system 101-111NThe degree of difference in state of health SOH of (a) may be reduced to 5% or less. Of course, the selected value of the degree of difference is not limited to 5%, and other values may be selected and set according to the specific situation.
In one embodimentIn, a plurality of branches 1101-110NEnergy pack 1111-111NThe degree of difference in state of health SOH therebetween may be, but is not limited to, by the plurality of legs 1101-110NEnergy pack 1111-111NIs expressed as a first difference Δ SOH between the maximum SOH and the minimum SOH. The larger the first difference Δ SOH, the larger the degree of difference therebetween.
In an embodiment, the life cycle management unit 210 is provided with an SOH difference calculation module 211, configured to calculate the first difference Δ SOH; for example, the SOH difference calculation module 211 arranges the SOHs of the branches in order from large to small, and takes the first difference Δ SOH between the maximum SOH and the minimum SOH.
Further, as shown in fig. 1, the life cycle management unit 210 is further provided with a determining module 212, and the determining module 212 is configured to determine whether the first difference Δ SOH exceeds a predetermined allowable value Δ SOHmax(ii) a At Δ SOH > Δ SOHmaxIn the case of (2), a plurality of branches 110 are shown1-110NEnergy pack 1111-111NThe degree of difference between the state of health SOH exceeds a predetermined allowable value Δ SOHmaxI.e. at present
Energy pack 1111-111NThe SOH difference degree of the health states is large, and life cycle management needs to be introduced; at delta SOH ≦ delta SOHmaxIn the case of (2), a plurality of branches 110 are shown1-110NEnergy pack 1111-111NDoes not differ by more than a predetermined allowable value Δ SOHmaxI.e. current energy packet 1111-111NThe degree of difference in state of health SOH between them is relatively small and it may be temporarily unnecessary to introduce life cycle management.
Note that, since the SOH of each energy pack 111 may be dynamically changed as the charging and discharging process is continuously performed, the determination result may be dynamically changed.
Further, as shown in fig. 1, a first priority determining module 213 is further disposed in the life cycle managing unit 210, and the first priority determining module 213 is configured to determine whether the detected result is positiveExceeding a predetermined permissible value Δ SOHmaxAccording to a plurality of branches 1101-110NEnergy pack 1111-111NDetermines the first priority of charging/discharging in turn from large to small, for example, the first priority of the branch 110 corresponding to the energy packet 111 with large SOH is relatively high; the life cycle management unit 210 obtains the first priority, so that the multi-branch power distribution management device 200 can control the branch 110 with the relatively higher first priority to charge or discharge preferentially.
It will be understood that in the above embodiment, as the charging and discharging processes of the energy packet 111 with larger SOH are performed more, the SOH thereof is decreased relatively fastest, and therefore, the SOH of the energy packets 111 of all the branches 110 will tend to be consistent until Δ SOH ≦ Δ SOHmax。
In yet another embodiment, the life cycle management unit 210 may define a lowest limit value of the SOH, that is, a predetermined limit value, and when the SOH of a certain energy package 111 is lower than the set limit value, in order to ensure the capacity authenticity of the energy storage system 10, the energy package 111 may be considered to have no value for application in the energy storage system 10, considering retirement from an energy storage scenario; that is, the lifecycle management unit 210 is in the plurality of branches 1101-110NEnergy pack 1111-111NOne of the energy packets 111xIs less than or equal to a predetermined limit value, the energy packet 111 is injectedx Corresponding branch circuit 110xExcluded from the plurality of branches to form a new plurality of branches, e.g., plurality of branches 1101-110(X-1)And 110(X+1)-110NThus, the combination of the plurality of energy packets is also updated accordingly. It will be appreciated that the lifecycle management unit 210 can perform the above-described lifecycle management based on the new plurality of legs.
It should be noted that the multi-branch power distribution management device 200 of the energy storage system 10 also measures the charging and discharging electric quantities of the energy packets 111 of each branch 110 in real time to correct the SOH of the energy packets 111, so as to ensure the capacity load nominal capacity of the energy storage system 10. During the whole life cycle of the energy storage system 10, the number of charge and discharge cycles experienced by each energy packet 111 is counted, and the SOH difference calculation module 211 reorders the SOHs of the energy packets 111 of each branch 110 after each energy packet 111 undergoes a number (which may be set) of charge and discharge cycles.
In yet another embodiment, the multi-branch power distribution management device 200 may be configured to: total power available for charging P in energy storage system 10chgGreater than a plurality of branches 1101-110NDirectly controls the plurality of branches 110 in case of maximum allowed total charging power1-110NThe energy packets of (a) are charged with equal priority; and/or total power P required at discharge of energy storage system 10dischgGreater than a plurality of branches 1101-110NDirectly controls the plurality of branches 110 in case of maximum allowable total discharge power1-110NAre discharged with equal priority. Thus, the total power available for charging P is onlychgThe total power P of the discharging requirement under the condition of less than or equal to the maximum allowable charging total power of the plurality of branchesdischgAnd under the condition that the total maximum allowable discharge power of the plurality of branches is less than or equal to the total maximum allowable discharge power of the plurality of branches, triggering the life cycle management unit 210 to perform the life cycle management process.
As shown in fig. 1, the multi-branch power distribution management apparatus 200 further includes an energy balance management unit 220, and the energy balance management unit 220 is configured to be disposed in the plurality of branches 1101-110NAll energy packets 1111-111NThe degree of difference between the SOH values does not exceed a predetermined allowable value Δ SOHmaxThe charging/discharging priority of each branch circuit 110 is determined based on the SOH and the state of charge SOC of the energy pack 111 corresponding to each branch circuit 110. The degree of difference in SOH does not exceed a predetermined allowable value Δ SOHmaxThe judgment result of (2) can be obtained from the judgment module 212 of the above embodiment. That is, it is determined that Δ SOH ≦ Δ SOHmaxIn the case of (1), the energy balance management unit 220 is used to perform multiple branches 1101-110NEnergy balance management.
In an embodiment, the charging/discharging priority of each branch 110 is implemented by setting a priority index calculation module 221 in the energy balance management unit 220, where the priority index calculation module 221 calculates the charging priority index P corresponding to each branch based on the following formula (1):
　　　　　　　　　　　P= SOC-λ×SOH （1）；
wherein λ is a weighting coefficient, which is further calculated by the following formula (2):
Figure 530982DEST_PATH_IMAGE001
（2）；
wherein N is a plurality of branches 1101-110NN is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiSOH of energy packet representing ith branchiAnd a plurality of branches 1101-110NAll energy packets 1111-111NThe difference between the minimum SOH of (1).
Similarly, the priority index calculation module 221 is further configured to calculate the discharge priority index Q corresponding to each branch based on the following formula (3):
　　　　　　　　　　　Q= SOC+λ×SOH （3）；
wherein λ is a weighting coefficient, and the calculation principle is the same as above.
The energy balance management unit 220 is further provided with a second priority determining module 223, and the second priority determining module 223 is configured to determine a second priority of charging in sequence from small to large according to the charging priority index P, and similarly, determine the second priority of charging in sequence from large to small according to the discharging priority index Q. Specifically, for multiple branches 1101-110NSequencing according to the charging priority index P to determine a second priority of charging; for a plurality of branches 1101-110NAnd sequencing according to the discharge priority index Q to determine the second priority of discharge.
In an embodiment, the energy balance management unit 220 is further configured to determine the number of branches 110 when the charging priority index P/discharging priority index Q is less than or equal to a predetermined value1-110NAll energy packets 1111-111NTo distribute charging/discharging power such that the SOC of all energy packets tends to be uniform; for example, charge/discharge power distribution is performed according to the SOC ratio.
After the multi-branch energy storage system 10 of the above embodiment performs power distribution management in the charging and discharging process by using the multi-branch power distribution management device 200, it can perform balance management on the life cycle between the energy packets 111 according to the difference of SOH of the energy packets 111 (e.g. batteries) of each branch 110 of the system and the charging and discharging power requirements, so that the life cycles of the energy packets 111 of each branch 110 tend to be consistent, and the too fast exhaustion of the life cycle of the energy packet 111 with low SOH is effectively avoided, and at the same time, according to the charging and discharging power requirements of the multi-branch energy storage system 10, by combining the SOC and SOH of the energy packet 111 of each branch 110, it is possible to obtain the charging priority index P and the discharging priority index Q, the energy packet 111 with low P value is preferentially charged during charging, and the energy packet 111 with high Q value is preferentially discharged during discharging, so that the SOC of the energy packet 111 of each branch 110 can be rapidly and effectively adjusted to a more balanced state, the energy packets 111 of the branches 110 are prevented from working in a state of charge imbalance for a long time, which is beneficial to ensuring the consistency of the health states of the energy packets 111. Further, the SOC among the energy packets 111 is finely adjusted and balanced in a manner of distributing the charge and discharge power according to the SOC ratio, so that the SOCs of the energy packets 111 of all the branches 110 are kept consistent as much as possible, and the balancing capability of the states of charge of the energy packets 111 is further improved.
The operation principle of the multi-branch power distribution management device 200, in particular, the operation principle of the multi-branch energy storage system 10, will be described below by taking the energy pack 111 in the multi-branch energy storage system 10 as a battery (e.g., a power lithium battery) which is utilized in a stepped manner.
In order to balance the energy of the energy packets 111 of each branch circuit 110, the charging and discharging power of the multi-branch circuit energy storage system 10 needs to be distributed and managed, and the specific implementation scheme is as follows:
the power distribution of each branch 110 of the multi-branch energy storage system 10 is combined with the total power of the actual system, the charging and discharging conditions of each branch 110, the SOC state of the energy packet 111 of each branch 110, the SOH of the energy packet 111 of each branch 110, and the like to perform a comprehensive decision, and mainly includes the life cycle management and the energy balance management of the energy packet 111, which are respectively and mainly implemented by the life cycle management unit 210 and the energy balance management unit 220 of the multi-branch power distribution management device 200.
Battery life cycle management
The multi-branch energy storage system 10 may set a predetermined allowable value Δ SOH with respect to the SOH difference value between the energy packets 111 of the respective branches 110max(generally, less than 5%) of the SOH values of the branches 110 are arranged in descending order, the difference between the maximum SOH value and the minimum SOH value, i.e., Δ SOH, is taken, and then Δ SOH and Δ SOH are calculated according to the differencemaxComprehensively managing the relationship of (1); meanwhile, a predetermined limit value of the SOH of the energy package 111 may be defined, which reflects the lowest limit value that can be used in the multi-branch energy storage system 10, and when the SOH of a certain energy package 111 is lower than the set predetermined limit value, in order to ensure the capacity authenticity of the energy storage system 10, it may be determined that the energy package 111 does not have the value of being applied in the energy storage system, considering the retirement from the energy storage system 10; the energy storage system 10 also measures the charging and discharging electric quantity of the energy packet 111 of each branch circuit 110 in real time to correct the SOH of the energy packet 111, so as to ensure the capacity load nominal capacity of the energy storage system 10; during the whole life cycle of the energy storage system 10, the number of charge and discharge cycles experienced by each energy packet 111 is counted, and the life cycle management unit 210 reorders the SOH of the energy packets 111 of each branch circuit 110 after each energy packet 111 undergoes a number of (settable) charge and discharge cycles.
(1) If Δ SOH>ΔSOHmax
In this case, the branch 110 with the largest SOH of the energy package 111 is preferably used in case of meeting the total power demand of the system, and the basic charging and discharging process is as follows.
(a) Charging of electricity
If the power of the power grid system is enough, the energy packets 111 of all the branches 110 are charged with full power; if the total power of the system is insufficient, a sorting table is formed according to the SOH of the energy packets 111, the charging priority of each energy packet 111 is sorted, and the charging priority of high SOH is provided withThe energy packets 111 with the next highest SOH are charged when the surplus is left, and the charging is performed in sequence. During the charging process of a certain energy packet 111, the SOC of the certain energy packet is continuously increased, the corresponding charging current is also continuously decreased, and the vacated power is reserved for charging other energy packets 111. In a word, in the whole charging process, dynamic regulation is carried out around the total power of the system and the maximum allowable charging power of the battery, and the total power capacity of the system is utilized to the maximum efficiency. When a certain energy packet 111 is fully charged, it is removed from the charging priority ranking table, and Δ SOH of the remaining energy packets 111 that are not fully charged are removedmaxThe relationship is reviewed again, and charging is continued according to the above principle, if the remaining energy package 111 satisfies that Δ SOH is less than or equal to Δ SOHmaxThen, the energy balance management between the energy packets 111 is performed according to the following principle of the aspect (2).
(b) Discharge of electricity
Forming a sorting table for discharging according to the SOH high-low sorting of the energy packets 111 of all the branches 110, thereby defining the discharging priority among the defined energy packets 111, wherein the energy packets 111 with high SOH are discharged preferentially until the energy packets are removed from the sorting table of the discharging priority after being discharged, comparing the SOH relations of the remaining energy packets 111 which are not discharged, and if delta SOH is still satisfied>ΔSOHmaxThen continuing to discharge according to the principle; if Δ SOH, Δ SOH of the remaining batterymaxThe relationship satisfies that Δ SOH is less than or equal to Δ SOHmaxThen, the energy balance management between the energy packets 111 is performed according to the following principle of the aspect (2).
(2) At delta SOH ≦ delta SOHmaxIn the case of (2), the charge or discharge control is performed in accordance with the battery energy balance management principle described below.
Battery energy balance management
(1) Charging of electricity
The total charging power demand P of the energy storage system 10 can be determined according to the actual requirementchgMaximum total allowable charging power with all branches 110
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Is allocated, wherein P ischg-iRepresenting the maximum allowed total charging power for branch i.
(A) If the total required power for charging energy storage system 10 is sufficient, i.e. if
Figure DEST_PATH_IMAGE005
≥
Figure 846612DEST_PATH_IMAGE006
。
In this case, each branch 110 charges the energy pack 111 with the maximum charging Power that can be converted by the PCS (Power Conversion System) until the charging is completed.
(B) If the total required charging power P of the energy storage system 10chgAnd (4) deficiency. Namely, it is
Figure 430040DEST_PATH_IMAGE005
<
Figure 148597DEST_PATH_IMAGE006
。
In this case, total power available for charging P of energy storage system 10chg(corresponding to the grid charging power, for example) is less than the maximum total allowable charging power for all branches 110
Figure 133871DEST_PATH_IMAGE004
The SOH and the SOC of each energy storage pack 111 are comprehensively considered, and a charging priority index P is obtained, wherein the value P is calculated based on the following formula (1):
　　　　　　　　　　　　　　P= SOC - λ×SOH （1）。
wherein λ is a weighting coefficient, λ is used to measure the influence of the difference of SOH on the charge-discharge priority during the charge-discharge of the battery, and the calculation method of λ is as follows (assuming that there are N branches 110 in total)1To 110N）：
(a) Find N branches 1101To 110NThe minimum value SOH of the energy packet in (1)min；
(b) Calculate the rest in turnSOH of each branch 110 is the same as SOHminDifference of (a), i.e. Δ SOH1、ΔSOH2、…、ΔSOHN-1；
(c) Δ SOH of each of the remaining legs 1101、ΔSOH2、…、ΔSOHN-1The weighting coefficient λ can be calculated by accumulation, i.e., by the following equation (2):
Figure DEST_PATH_IMAGE007
（2）。
the value range of lambda is determined to be 0 to (N-1) delta SOHmax。
Therefore, the charging priority indexes P of the energy packets 111 of each branch circuit 110 can be obtained, and then the charging priority indexes P of each branch circuit 110 are sequentially arranged from small to large, and each branch circuit 110 obtains the arrangement number of the charging priority index P, and the arrangement number is used as the charging priority.
Further, an allowable maximum difference (i.e. a predetermined value X) between the charging priority indexes P is set, and if the difference between the current maximum charging priority index P and the minimum charging priority index P is smaller than the predetermined value X, the energy packets 111 of each branch 110 are charged according to an average distribution principle; otherwise, the energy packet 111 with the smallest charging priority index P in the branch 110 is charged first, and then, if there is remaining power, the branch 110 with the lowest charging priority index P is charged, and the charging is carried out sequentially until the distribution of the charging power of the power grid is completed. When the difference value between the charging priority indexes P is smaller than the predetermined value X, the equalization fine-tuning stage is entered, and the power of each branch 110 is distributed according to the ratio of the SOC of each branch until the charging is completed.
(2) Discharge of electricity
Similar to the above charging process, the total required power P for discharging of the actual energy storage system 10 can be determineddischgMaximum allowable total discharge power with all branches 110
Figure 37105DEST_PATH_IMAGE008
Is allocated, wherein P isdischg-iRepresenting the maximum allowable total discharge power for branch i.
(A) Total power demand P if discharge of energy storage system 10dischgGreater than or equal to the maximum total allowable discharge power of all branches 110
Figure 576670DEST_PATH_IMAGE008
I.e. by
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≥
Figure 974285DEST_PATH_IMAGE008
。
Under such a condition, each branch circuit 110 will discharge according to its corresponding maximum allowable total charging power until the energy stored in the energy packet 111 of the branch circuit 110 is exhausted.
(B) Total power demand P if discharge of energy storage system 10dischgLess than the maximum allowable total discharge power of all branches 110
Figure 282906DEST_PATH_IMAGE008
I.e. by
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<
Figure 56007DEST_PATH_IMAGE008
。
In this case, the discharge priority index Q is calculated based on the following equation (3) in consideration of the SOH and SOC of each energy pack 111:
　　　　　　　　　　　　　Q= SOC + λ×SOH （3）。
wherein λ is a weighting coefficient, and the calculation method is the same as above. Thus, the discharge priority indexes Q of the energy packets 111 of each branch 110 can be obtained, the discharge priority indexes Q of the energy packets 111 of each branch 110 are arranged in sequence from large to small, and each branch 110 obtains the arrangement number of the discharge priority index Q, and the arrangement number is used as the discharge priority.
Further, an allowable maximum difference (i.e., a predetermined value X) between the discharge priority indexes Q is set, and if the difference between the current maximum discharge priority index Q and the minimum discharge priority index Q is smaller than the predetermined value X, the discharge is performed through the energy packets 111 of the branches 110 according to the principle of the average distribution; otherwise, the energy packet 111 with the highest discharge priority index Q in the branch 110 is discharged preferentially, and further, if the total power P required by the system discharge cannot be met yetdischgThen, the branch circuits 110 with the low discharge priority index Q are further discharged and pushed forward until the total discharge power of each branch circuit meets the total discharge power P of the energy storage system 10dischg. And when the difference value between the discharging priority indexes Q is smaller than a preset value X, entering a balanced fine adjustment stage, and distributing the power of each branch according to the ratio of the SOC of each branch until discharging is finished.
Therefore, the charging and discharging power distribution of each branch circuit 110 can be ensured under the condition that the total power required by the charging and discharging of the energy storage system 10 is met, the energy balance of each branch circuit 110 can be rapidly realized, and the overuse or the over-charging and over-discharging of a certain single branch circuit can be avoided.
Fig. 2 is a flow chart of a multi-branch power distribution management method according to an embodiment of the invention. The multi-branch power distribution management method according to the embodiment of the present invention is described below with reference to fig. 1 and fig. 2 by taking a charging process as an example.
First, in step S410, a judgment is made
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≥
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If yes, the process proceeds to step S420, if no, the process proceeds to step S430.
Step S420, each branch 110 is charged with its corresponding maximum allowable total power Pchg-iThe charging is performed until the charging is completed in step S470. In this process, each branch 110 may be controlled to charge with equal priority.
Step S430, subtracting the minimum SOH from the maximum SOH of the energy packets of the plurality of branches to calculate a difference Δ SOH, wherein, of course, in the calculation process, the minimum SOH is greater than the predetermined limit value, and when the SOH of one energy packet is less than or equal to the predetermined limit value, the branch corresponding to the energy packet is excluded from the plurality of branches to form a new plurality of branches.
Step S440, judging Delta SOH
Figure 321270DEST_PATH_IMAGE010
ΔSOHmaxWhether the result is true or not; wherein Δ SOHmaxIs a predetermined allowable value, which may be set in advance, for example, 5%; if yes, the process proceeds to step S451, and if no, the process proceeds to step S461.
Step S451, determining the charging priority in order from large to small according to the SOH size relationship among the energy packets of the plurality of branches.
In step S452, the branches satisfying the higher SOH are charged with priority, that is, the branches are charged in sequence with the priority determined in step S451 until the charging is completed in step S470.
In step S461, the charging priority index P corresponding to each branch is calculated based on the above equations (1) and (2).
In step S462, the charging priority indexes P of the branches 110 are sorted, for example, from small to large according to the charging priority indexes P, so as to determine the charging priority of the branches in turn.
Step S463, determining whether the difference between the charging priority indexes P is less than or equal to a corresponding predetermined value; if yes, the process proceeds to step S464, and if no, the process proceeds to step S465.
In step S464, the charging power is distributed according to the SOCs of the energy packets of the plurality of branches to make the SOCs of the energy packets tend to be consistent, for example, according to the ratio of the SOCs between the energy packets 111 of the plurality of branches 110, until the charging process is completed in step S470.
Step S465, the branch circuit which meets the requirement of relatively low P value is charged preferentially until the charging process is finished in step S470
Step S470, determining whether the charging is completed, returning to step S410 if the determination is "no", otherwise, ending the sequential charging.
Fig. 3 is a flow chart illustrating a multi-branch power distribution management method according to another embodiment of the invention. The multi-branch power distribution management method according to the embodiment of the present invention is described below with reference to fig. 1 and 3 by taking a discharging process as an example.
First, in step S510, a judgment is made
Figure 366586DEST_PATH_IMAGE009
≥
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If the determination is yes, the process proceeds to step S520, and if the determination is no, the process proceeds to step S530.
Step S520, each branch 110 is discharged with its corresponding maximum allowable total power Pdischg-iThe discharging is performed until the discharging is completed in step S570. In this process, each branch 110 may be controlled to discharge at equal priority.
Step S530 is to subtract the maximum SOH and the minimum SOH of the energy packets of the plurality of branches to calculate a difference Δ SOH, where of course, in the calculation process, the minimum SOH is greater than the predetermined limit value, and when the SOH of one energy packet is less than or equal to the predetermined limit value, the branch corresponding to the energy packet is excluded from the plurality of branches to form a new plurality of branches.
Step S540, determining Delta SOH
Figure 153331DEST_PATH_IMAGE010
ΔSOHmaxWhether the result is true or not; wherein Δ SOHmaxIs a predetermined allowable value, which may be set in advance, for example, 5%; if yes, the process proceeds to step S551, and if no, the process proceeds to step S561.
And S551, sequentially determining the discharging priority from large to small according to the SOH size relation among the energy packets of the plurality of branches.
In step S552, the branches satisfying the higher SOH are discharged preferentially, that is, the branches are discharged sequentially at the priority determined in step S551 until the discharging is completed in step S570.
In step S561, the discharge priority index Q corresponding to each branch is calculated based on the above formulas (3) and (2).
In step S562, the discharge priority indexes Q of the branches 110 are sorted, for example, from large to small according to the discharge priority indexes Q, so as to determine the discharge priority of the branches in turn.
Step S563 of determining whether the difference between the discharge priority indexes Q is less than or equal to a corresponding predetermined value; if yes, the process proceeds to step S564, and if no, the process proceeds to step S565.
In step S564, the discharging power is distributed according to the SOCs of the energy packets of the plurality of branches to make the SOCs of the energy packets tend to be consistent, for example, distributed according to the ratio of the SOCs between the energy packets 111 of the plurality of branches 110, until the discharging process is completed in step S570.
Step S565, the branch with the higher Q value is discharged until the discharging process is completed in step S570
And step S570, determining whether the discharging is finished, returning to step S510 if the determination is no, otherwise, ending the sequential discharging.
It will be understood that these flow diagrams above may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block and/or flow diagram block or blocks.
These computer program instructions may be stored in a computer-readable memory that can direct a computer or other programmable processor to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program instructions may be loaded onto a computer or other programmable data processor to cause a series of operational steps to be performed on the computer or other programmable processor to produce a computer implemented process such that the instructions which execute on the computer or other programmable processor provide steps for implementing the functions or acts specified in the flowchart and/or block diagram block or blocks. It should also be noted that, in some alternative implementations, the functions/acts noted in the blocks may occur out of the order noted in the flowcharts. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved.

Claims (33)

1. A multi-branch power distribution management apparatus for a multi-branch energy storage system, comprising:
a life cycle management unit for determining whether to preferentially charge/discharge with a branch having a relatively large SOH according to a degree of difference in SOH state between energy packets of a plurality of branches;
wherein the lifecycle management unit is further configured to differ the state of health SOH between energy packets of the plurality of legs by more than a predetermined allowed value Δ SOHmaxThe control preferentially charges/discharges the branch with a relatively large SOH.
2. The multi-branch power distribution management device according to claim 1, further comprising: and the energy balance management unit is used for determining the charging/discharging priority of each branch circuit based on the SOH and the SOC of the energy packet corresponding to the branch circuit.
3. The multi-leg power distribution management device of claim 2 wherein the energy balance management unit is further configured to not differ the SOH among the energy packets of the plurality of legs by more than a predetermined allowed value Δ SOHmaxBased on the SOH and SOC of the energy packet corresponding to each branchCharging/discharging priority of the branch.
4. The multi-leg power distribution management device according to claim 3 wherein the degree of difference in state of health, SOH, between the energy packets of the plurality of legs is represented by a first difference, Δ SOH, between a maximum SOH and a minimum SOH of the energy packets of the plurality of legs.
5. The multi-branch power distribution management device according to claim 4, wherein the lifecycle management unit comprises:
an SOH difference calculation module for calculating the first difference Δ SOH;
a judging module for judging whether the first difference value Δ SOH exceeds the predetermined allowable value Δ SOHmax(ii) a And
a first priority determining module for determining whether the predetermined allowable value Δ SOH is exceededmaxThe first priority of charging/discharging is determined in turn from large to small according to the SOH size of the energy packets of the plurality of branches.
6. The multi-drop power distribution management device of claim 1, wherein the multi-drop power distribution management device is further configured to: total power available for charging P at the energy storage systemchgDirectly controlling the energy packets of the plurality of branches to charge with the same priority level under the condition that the maximum allowable total charging power of the plurality of branches is greater than; and/or
Total power P of discharge demand in the energy storage systemdischgAnd directly controlling the energy packets of the plurality of branches to discharge with the same priority level under the condition of more than the maximum allowable total discharge power of the plurality of branches.
7. The multi-branch power distribution management device according to any one of claims 1 to 6, wherein the lifecycle management unit is further configured to exclude a branch corresponding to an energy packet of the plurality of branches from the plurality of branches to form a new plurality of branches if the SOH of the energy packet is less than or equal to a predetermined limit value.
8. The multi-branch power distribution management device according to claim 3 wherein the predetermined allowed value Δ SOHmaxLess than or equal to 5%.
9. The multi-branch power distribution management device according to claim 2, wherein the energy balance management unit further comprises:
a priority index calculation module for calculating a charging priority index P corresponding to each branch based on the following formula (1):
P= SOC-λ×SOH （1）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
Figure DEST_PATH_IMAGE001
（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
10. The multi-branch power distribution management device according to claim 9, wherein the energy balance management unit further comprises:
and the second priority determining module is used for sequentially determining the second priority of charging from small to large according to the charging priority index P.
11. The multi-branch power distribution management device according to claim 2, wherein the energy balance management unit further comprises:
a priority index calculation module for calculating a discharge priority index Q corresponding to each branch based on the following formula (3):
Q= SOC+λ×SOH （3）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
Figure DEST_PATH_IMAGE002
（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
12. The multi-branch power distribution management device according to claim 11, wherein the energy balance management unit further comprises:
and the second priority determining module is used for sequentially determining the second priority of the discharge from large to small according to the discharge priority index Q.
13. The multi-branch power distribution management device according to claim 9, wherein the energy balance management unit is further configured to distribute the charging power in accordance with the SOCs of the plurality of energy packets of the plurality of branches when the difference between the charging priority indexes P is less than or equal to the respective predetermined values, so that the SOCs of the plurality of energy packets tend to coincide.
14. The multi-branch power distribution management device according to claim 11, wherein the energy balance management unit is further configured to distribute the discharge power in accordance with the SOCs of the plurality of energy packets of the plurality of branches so that the SOCs of the plurality of energy packets tend to coincide when the difference between the discharge priority indexes Q is less than or equal to a corresponding predetermined value.
15. The multi-branch power distribution management device according to claim 1, wherein the energy package is a power battery package for use on an electric vehicle for echelon utilization.
16. A multi-branch energy storage system comprises a plurality of branches, wherein each branch is provided with an energy packet, a power conversion module and a branch charging and discharging control module; it is characterized by also comprising:
the multi-branch power distribution management device according to any one of claims 1 to 15 coupled to the branch charge and discharge control modules of the plurality of branches.
17. The multi-branch energy storage system according to claim 16, further comprising:
and the human-computer interaction interface is coupled with the multi-branch power distribution management device and is used for displaying the running state information of the multi-branch energy storage system in the charging/discharging process.
18. A multi-branch power distribution management method for a multi-branch energy storage system is characterized by comprising the following steps:
a life cycle management step: whether to preferentially charge/discharge with a branch having a relatively large SOH is determined according to the degree of difference in state of health SOH between energy packets of a plurality of branches,
in the life cycle management step, the degree of difference in state of health SOH between the energy packets of the plurality of legs exceeds a predetermined allowable value Δ SOHmaxThe control preferentially charges/discharges the branch with a relatively large SOH.
19. The multi-branch power distribution management method of claim 18 further comprising: energy balance management: and determining the charging/discharging priority of each branch circuit based on the SOH and the SOC of the energy packet corresponding to each branch circuit.
20. The multi-branch power distribution management method of claim 19,
in the energy balance management step, the difference degree of SOH among the energy packets of the plurality of branches does not exceed a predetermined allowable valueΔSOHmaxThe charging/discharging priority of each branch is determined based on the SOH and the state of charge SOC of the energy packet corresponding to the branch.
21. The multi-leg power distribution management method of claim 20 wherein the degree of difference in state of health SOH between the energy packets of the plurality of legs is represented by a first difference Δ SOH between a maximum SOH and a minimum SOH of the energy packets of the plurality of legs.
22. The multi-branch power distribution management method according to claim 21, wherein said lifecycle management step comprises:
calculating the first difference value Δ SOH;
judging whether the first difference value Delta SOH exceeds the preset allowable value Delta SOH or notmax(ii) a And
when judged to exceed the predetermined allowable value Δ SOHmaxThe first priority of charging/discharging is determined in turn from large to small according to the SOH size of the energy packets of the plurality of branches.
23. The multi-branch power distribution management method according to claim 18, further comprising the steps of:
total power available for charging P at the energy storage systemchgDirectly controlling the energy packets of the plurality of branches to charge with the same priority level under the condition that the maximum allowable total charging power of the plurality of branches is greater than; and/or
Total power P of discharge demand in the energy storage systemdischgAnd directly controlling the energy packets of the plurality of branches to discharge with the same priority level under the condition of more than the maximum allowable total discharge power of the plurality of branches.
24. The multi-branch power distribution management method according to claim 18 wherein said lifecycle management step further comprises:
and under the condition that the SOH of one energy packet of all the energy packets of the plurality of branches is less than or equal to a preset limit value, the branch corresponding to the energy packet is excluded from the plurality of branches to form a new plurality of branches.
25. The multi-branch power distribution management method according to claim 20 wherein said predetermined allowed value Δ SOHmaxLess than or equal to 5%.
26. The multi-branch power distribution management method according to claim 19, wherein said energy balance management step further comprises:
a priority index calculation sub-step: calculating a charging priority index P corresponding to each branch circuit based on the following formula (1):
P= SOC-λ×SOH （1）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
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（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
27. The multi-branch power distribution management method according to claim 26, wherein said energy balance management step further comprises:
second priority determination substep: and sequentially determining a second charging priority according to the charging priority index P from small to large.
28. The multi-branch power distribution management method according to claim 19, wherein said energy balance management step further comprises:
a priority index calculation sub-step: calculating a discharge priority index Q corresponding to each branch based on the following formula (3):
Q= SOC+λ×SOH （3）；
where λ is a weighting coefficient, which is calculated by the following formula (2):
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（2）；
wherein N is the sum of the number of the plurality of branches, N is more than or equal to 2, i represents the ith branch of the N branches, i is less than or equal to N, and delta SOHiRepresents a difference between the SOH of the energy packet of the ith branch and a minimum SOH among the energy packets of the plurality of branches.
29. The multi-branch power distribution management method according to claim 28, wherein said energy balance management step further comprises: second priority determination substep: and sequentially determining a second discharging priority according to the discharging priority indexes Q from large to small.
30. The multi-branch power distribution management method according to claim 26, wherein said energy balance management step further comprises: distributing charging power according to the SOC of all energy packets of the plurality of branches when the charging priority index P is less than or equal to a corresponding predetermined value, so that the SOC of the plurality of energy packets tend to be consistent.
31. The multi-branch power distribution management method according to claim 28, wherein said energy balance management step further comprises: and distributing the discharge power according to the SOC of all the energy packets of the plurality of branches when the discharge priority index Q is less than or equal to a corresponding preset value so as to enable the SOC of the energy packets to be consistent.
32. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program is capable of performing the steps of the multi-branch power distribution management method according to any one of claims 18-31.
33. A computer-readable storage medium having stored thereon a computer program, the program being executable by a processor to perform the steps of the multi-branch power distribution management method according to any of claims 18-31.
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