CN109617247A - A kind of energy storage system control method and equipment - Google Patents
A kind of energy storage system control method and equipment Download PDFInfo
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- CN109617247A CN109617247A CN201811614510.2A CN201811614510A CN109617247A CN 109617247 A CN109617247 A CN 109617247A CN 201811614510 A CN201811614510 A CN 201811614510A CN 109617247 A CN109617247 A CN 109617247A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The embodiment of the present application discloses a kind of energy storage system control method, comprising: obtains system power instruction；Determine that system power instructs corresponding charging and discharging state；If charging and discharging state corresponds to charged state, match logic into charger assembled by several branch；Charger assembled by several branch includes: that the battery cluster for being higher than average SOC value for state-of-charge SOC value distributes corresponding charge power reduced cluster power instruction with logic, is lower than average SOC value battery cluster for SOC value and distributes corresponding charge power increased cluster power instruction；If charging and discharging state corresponds to discharge condition, logic is distributed into electric discharge；Electric discharge distribution logic includes: that the battery cluster for being higher than average SOC value for state-of-charge SOC value distributes corresponding discharge power increased cluster power instruction, is lower than average SOC value battery cluster for SOC value and distributes corresponding discharge power reduced cluster power instruction；Solving existing equalization methods is the SOC balance for being directed to battery cell in cluster, the technical issues of lacking for control method balanced between energy-storage system cluster.
Description
Technical field
This application involves energy storage control technology field more particularly to a kind of energy storage system control methods and equipment.
Background technique
Large capacity energy-storage system is complicated due to constituting, it will usually sub-clustering management is carried out to the energy-storage units in it, even if electric
By going here and there and waiting operations to form the battery cluster of high current high voltage between pond, and each battery cluster further constitutes entire energy storage
System.
For improve energy-storage system durability, reliability and safety, in addition to the lotus in battery cluster between each battery cell
Except electricity condition SOC balance, for whole energy-storage system, it is also required to realize SOC balance between battery cluster.Especially exist
When the power output demand of energy-storage system approaches the even more than rated power of energy-storage system, if SOC is unbalanced between battery cluster,
Power short slab will be formed to entire energy-storage system.In electric discharge, the discharge power of energy-storage system will be limited by the minimum electricity of SOC value
Pond cluster, in charging, the charge power of energy-storage system will be limited by the highest battery cluster of SOC value, the power of energy-storage system entirety
Fan-out capability will be extremely limited.
However, existing equalization methods are to lack for the SOC balance of battery cell in cluster between energy-storage system cluster
Balanced control method.
Summary of the invention
The embodiment of the present application provides a kind of energy storage system control method and equipment, and solving existing equalization methods is
For the SOC balance of battery cell in cluster, the technical issues of lacking for control method balanced between energy-storage system cluster.
In view of this, the application first aspect provides a kind of energy storage system control method, comprising:
Obtain system power instruction；
Determine that the system power instructs corresponding charging and discharging state；
If the charging and discharging state corresponds to charged state, match logic into charger assembled by several branch；
The charger assembled by several branch includes: with logic
The battery cluster for being higher than average SOC value for state-of-charge SOC value distributes corresponding charge power reduced cluster power
Instruction is lower than average SOC value battery cluster for SOC value and distributes corresponding charge power increased cluster power instruction；
If the charging and discharging state corresponds to discharge condition, logic is distributed into electric discharge；
The electric discharge distributes logic
The battery cluster for being higher than average SOC value for state-of-charge SOC value distributes corresponding discharge power increased cluster power
Instruction is lower than average SOC value battery cluster for SOC value and distributes corresponding discharge power reduced cluster power instruction.
Preferably,
After determining that the system power instructs corresponding charging and discharging state, cluster power instruction is distributed for battery cluster one by one；
The charger assembled by several branch is specifically included with logic:
If the SOC value of present battery cluster is higher than average SOC value, reduction processing is carried out to power is currently divided equally；
If the SOC value of present battery cluster is lower than average SOC value, increase processing is carried out to power is currently divided equally；
The current cluster power instruction for dividing equally power after charge power alignment processing is distributed into present battery cluster；
The electric discharge distribution logic specifically includes:
If the SOC value of present battery cluster is higher than average SOC value, increase processing is carried out to power is currently divided equally；
If the SOC value of present battery cluster is lower than average SOC value, reduction processing is carried out to power is currently divided equally；
The current cluster power instruction for dividing equally power after discharge power alignment processing is distributed into present battery cluster；
Wherein, the power of currently dividing equally is the battery of the unallocated power at current time in unallocated cluster power instruction
Divide equally obtained power between cluster.
It preferably, is one by one the distribution of battery cluster after the determination system power instructs corresponding charging and discharging state
Cluster power instruction specifically includes:
If the system power instructs corresponding charged state, each battery cluster is ranked up by SOC value is ascending；According to
Sort obtained assignment order, distributes cluster power instruction one by one for battery cluster；
If the system power instructs corresponding discharge condition, each battery cluster is ranked up by SOC value is descending；According to
Sort obtained assignment order, distributes cluster power instruction one by one for battery cluster.
Preferably, include: before distributing cluster power instruction one by one for battery cluster
Judge present battery cluster whether be the unallocated cluster power instruction of last cluster battery cluster；
If so, distributing the cluster power instruction that charge/discharge power corresponds to remaining unallocated power for present battery cluster.
Preferably, further includes: calculate the SOC value of present battery cluster and the SOC ratio of average SOC value；
If the SOC value of the present battery cluster is higher than average SOC value, reduction processing is carried out to power is currently divided equally；If working as
The SOC value of preceding battery cluster is lower than average SOC value, carries out increase processing to current respectively power and specifically includes:
According to default control rule, the corresponding charging weighting coefficient of the SOC ratio is determined；
According to the charging weighting coefficient, processing is weighted to power is currently divided equally；
If the SOC value of the present battery cluster is higher than average SOC value, increase processing is carried out to power is currently divided equally；If working as
The SOC value of preceding battery cluster is lower than average SOC value, carries out reduction processing to current respectively power and specifically includes:
According to default control rule, the corresponding electric discharge weighting coefficient of the SOC ratio is determined；
According to the electric discharge weighting coefficient, processing is weighted to power is currently divided equally.
Preferably, further includes: calculate the current power ratio for dividing equally power and battery cluster rated power；
It is described regular according to default control, determine that the corresponding charging weighting coefficient of the SOC ratio specifically includes: according to pre-
If control rule, determines the power ratio and the SOC ratio corresponding charging weighting coefficient jointly；
It is described regular according to default control, determine that the corresponding electric discharge weighting coefficient of the SOC ratio specifically includes: according to pre-
If control rule, determines the power ratio and the SOC ratio corresponding electric discharge weighting coefficient jointly.
Preferably, the default control rule is established especially by following steps:
The codomain of the power ratio is divided into fill greatly, in fill, it is small fill, it is middle or small put, in put and put seven power ratios greatly
It is worth subinterval；
By the codomain of the SOC ratio be divided into small three-level, small second level, small level-one, in, big level-one, big second level and big by three
Seven SOC ratio subintervals of grade；
For the combination in each power ratio subinterval and SOC ratio subinterval, a corresponding weighting coefficient is set.
Preferably, before the instruction of acquisition system power further include:
Judge whether the distance last time for getting system power instruction is greater than default free time；
If so, logic of Equilibrium in the cluster of starting battery cluster.
Preferably, control logic in the cluster specifically:
S1: all battery cells in traversal battery cluster find highest first battery cell of voltage and voltage are minimum
The second battery cell；
S2: control first battery cell discharges to second battery cell；
S3: judge whether the voltage difference between first battery cell and second battery cell is greater than predeterminated voltage
Value, if it is not, continue step S2, otherwise, return step S1, until the voltage difference between any two battery cells is respectively less than and presets
Voltage value terminates.
The application second aspect provides a kind of energy-storage system control equipment, and the equipment includes processor and storage
Device:
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for any institute provided according to the above-mentioned first aspect of instruction execution in said program code
The energy storage system control method stated.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
In the embodiment of the present application, a kind of energy storage system control method is provided, is filled when determining that system power instruction is corresponding
When electricity condition, the battery cluster of average SOC value is higher than for SOC value, distributes the cluster power of the corresponding reduced processing of charge power
Instruction increases the SOC value of the percentage of batteries cluster slack-off；And it is lower than the battery cluster of average SOC value for SOC value, distribution corresponds to
The increased processing of charge power cluster power instruction, make the percentage of batteries cluster SOC increase become faster, over time,
SOC balance can be reached between battery cluster.And when system power instructs corresponding discharge condition, the high battery cluster distribution pair of SOC value
The high cluster power instruction of the discharge power answered keeps the decline of its SOC value very fast；And the corresponding electric discharge of battery cluster distribution that SOC value is low
The low cluster power instruction of power keeps the decline of its SOC value slower, after a period of time, the SOC between battery cluster equally may be implemented
It is balanced.As it can be seen that energy storage system control method provided by the embodiments of the present application has filled up blank balanced between cluster in the prior art, from
And largely reduce battery cluster to the power limit of large capacity energy-storage system, substantially increase the function of energy-storage system entirety
Rate fan-out capability.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of energy storage control system provided by the embodiments of the present application；
Fig. 2 is the flow chart for the energy storage system control method that the application one embodiment provides；
Fig. 3 is the flow chart of the energy storage system control method provided in second embodiment of the application；
Fig. 4 is the flow chart of the energy storage system control method provided in the application third embodiment；
Fig. 5 is the Membership Function Distribution figure of SOC ratio in the default control rule provided in the application third embodiment；
Fig. 6 is the Membership Function Distribution of power ratio in the default control rule provided in the application third embodiment
Figure；
Fig. 7 is the Membership Function Distribution of weighting coefficient in the default control rule provided in the application third embodiment
Figure；
Fig. 8 is the flow chart of the application examples of energy storage system control method provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
A kind of energy storage control system provided by the embodiments of the present application is illustrated first.
Referring to Figure 1, Fig. 1 is a kind of structural schematic diagram of energy storage control system provided by the embodiments of the present application.Wherein, respectively
A battery cluster and two-way DC/DC converter constitute the process layer that IEC61850 is defined；Energy accumulation current converter PCS and energy storage access are eventually
End constitutes wall；Work station and remote server, cloud platform are then in station level.Process layer and wall directly pass through guarantor
Shield is communicated with intelligent terminal status information (GOOSE) sub-protocol, passes through manufacture message specification between wall and station level
(MMS) sub-protocol carries out message interaction.
Two-way DC/DC converter can control the charge and discharge of battery cluster, be that realization is provided by the embodiments of the present application
The hardware foundation of energy storage system control method.Energy accumulation current converter PCS realizes the energy exchange between energy-storage system and power grid, energy
Measuring circulation path can be with reference to the double arrowed line in Fig. 1.
It should be noted that energy storage access terminal is the storage carried under any implementation provided by the embodiments of the present application
Can system control method hardware carrier, to above by oneself state information feed back to station level host and receiving workstation or on
The power instruction that position machine issues is directly monitored by each battery cluster of control, two-way DC/DC converter and PCS under.
Fig. 2 is referred to below, Fig. 2 is the flow chart for the energy storage system control method that the application one embodiment provides,
This method comprises:
Step 201 obtains system power instruction.
System power instructs corresponding two states, the first is charged state, second of discharge condition.In the present embodiment,
It is distinguished firstly the need of to both states.
It should be noted that system power instruction can be a system power numerical value, if the numerical value is positive, system is indicated
Power instruction corresponds to discharge condition, if the numerical value is negative, corresponds to charged state.Referred in present specification to charge power
Increase/reduction processing etc., it should be appreciated that increase/reduction to the absolute value of charge power numerical value, and not make it in number
Increase in value, such as the corresponding -100W of charge power, and the charge power after increasing may be -120W, the charge power after reduction
It may be -80W.
Step 202 determines that the system power instructs corresponding charging and discharging state.
Step 203, if it is determined that charging and discharging state correspond to charged state, enter step 204, however, it is determined that charging and discharging state
Corresponding discharge condition, enters step 205.
Step 204 corresponds to charger assembled by several branch with logic, and step 205 corresponds to electric discharge distribution logic.
Step 204, the corresponding charge power of battery cluster distribution for being higher than average SOC value for state-of-charge SOC value are reduced
Cluster power instruction, be lower than average SOC value battery cluster for SOC value and distribute corresponding charge power increased cluster power instruction.
It is higher than the battery cluster of average SOC value for SOC value, determine its charge/discharge watt level is allocated to the battery
The cluster power instruction of cluster.Therefore, for energy storage access terminal, cluster power instruction pair can be changed when distributing cluster power instruction
The charge/discharge power answered, to achieve the purpose that the charge/discharge power that battery cluster is decreased or increased.
The reduction of charge/discharge power/increase processing can be and carry out on the basis of some performance number, and more appropriate is equal
Divide power.Respectively power can be understood as the equal timesharing between the battery cluster of unallocated cluster power instruction of unallocated power, each
The power that the battery cluster of unallocated cluster power instruction is assigned to.It will be in subsequent embodiment specifically about the contents of the section
It is bright.
Step 205, the corresponding discharge power of battery cluster distribution for being higher than average SOC value for state-of-charge SOC value are increased
Cluster power instruction, be lower than average SOC value battery cluster for SOC value and distribute corresponding discharge power reduced cluster power instruction.
In the embodiment of the present application, a kind of energy storage system control method is provided, is filled when determining that system power instruction is corresponding
When electricity condition, the battery cluster of average SOC value is higher than for SOC value, distributes the cluster power of the corresponding reduced processing of charge power
Instruction increases the SOC value of the percentage of batteries cluster slack-off；And it is lower than the battery cluster of average SOC value for SOC value, distribution corresponds to
The increased processing of charge power cluster power instruction, make the percentage of batteries cluster SOC increase become faster, over time,
SOC balance can be reached between battery cluster.And when system power instructs corresponding discharge condition, the high battery cluster distribution pair of SOC value
The high cluster power instruction of the discharge power answered keeps the decline of its SOC value very fast；And the corresponding electric discharge of battery cluster distribution that SOC value is low
The low cluster power instruction of power keeps the decline of its SOC value slower, after a period of time, the SOC between battery cluster equally may be implemented
It is balanced.As it can be seen that energy storage system control method provided by the embodiments of the present application has filled up blank balanced between cluster in the prior art, from
And largely reduce battery cluster to the power limit of large capacity energy-storage system, substantially increase the function of energy-storage system entirety
Rate fan-out capability.
The above are the detailed description to the energy storage system control method provided in the application one embodiment, under request in person ginseng
See that Fig. 3, Fig. 3 are the flow chart of the energy storage system control method provided in second embodiment of the application, this method comprises:
Step 301 obtains system power instruction.
Step 302 determines that system power instructs corresponding charging and discharging state.
Step 303, judge present battery cluster whether be the unallocated cluster power instruction of last cluster battery cluster, if so, being
Present battery cluster distribution charge/discharge power corresponds to the cluster power instruction of remaining unallocated power, terminates, otherwise, into step
Rapid 304A or step 304B.
In the present embodiment, distributing the mode of cluster power instruction for battery cluster is to distribute one by one.Therefore, when the battery cluster is
When the battery cluster of the unallocated cluster power instruction of last cluster, it is only necessary to which charge/discharge power is corresponded to remaining unallocated power
Cluster power instruction distribute to the battery cluster, distribution terminates to also imply that method terminates.
If step 304A, system power instructs corresponding charged state, each battery cluster is arranged by SOC value is ascending
Sequence, and the assignment order obtained according to sequence, distribute cluster power instruction one by one for battery cluster.
The corresponding charging of cluster power instruction due in subsequent allocations cluster power instruction, distributing to present battery cluster is put
Electrical power is the current respectively power after alignment processing.And currently dividing equally power is the unallocated power at current time not
Distribute and divide equally obtained power between the battery cluster of cluster power instruction, thus its can with the progress that cluster power instruction distributes and by
It is decrescence small.
Further, if being first ranked up in charging, then playing to SOC by SOC value is ascending by each battery cluster
Value minimum battery cluster preferentially distributes the effect of cluster power instruction, and the corresponding charge power of cluster power instruction at this time is larger, can be with
Accelerate the growth of the battery cluster SOC value.Correspondingly, corresponding, system power instructs corresponding discharge condition in step 307, will be each
Battery cluster is ranked up by SOC value is descending, preferentially the battery cluster big to SOC value can carry out the distribution of cluster power instruction, this
When the corresponding discharge power of cluster power instruction it is larger, so as to so that the big battery cluster electric discharge of SOC value faster, makes balanced between cluster
Efficiency be greatly improved.
If step 305A, the SOC value of present battery cluster is higher than average SOC value, reduction processing is carried out to power is currently divided equally；
If the SOC value of present battery cluster is lower than average SOC value, increase processing is carried out to power is currently divided equally.
Step 305 can regard specific execution step when distributing cluster power instruction for battery cluster one by one as.As it can be seen that this reality
It applies in example, the corresponding charge/discharge power of the cluster power instruction that battery cluster is assigned to is based on currently dividing equally power, right
Current power of dividing equally carries out that the power obtained after processing is decreased or increased.
Step 306A, the current cluster power instruction for dividing equally power after charge power alignment processing is distributed into present battery
Cluster.
If step 304B, system power instructs corresponding discharge condition, each battery cluster is arranged by SOC value is descending
Sequence, and the assignment order obtained according to sequence, distribute cluster power instruction one by one for battery cluster.
If step 305B, the SOC value of present battery cluster is higher than average SOC value, increase processing is carried out to power is currently divided equally；
If the SOC value of present battery cluster is lower than average SOC value, reduction processing is carried out to power is currently divided equally.
Step 306B, the current cluster power instruction for dividing equally power after discharge power alignment processing is distributed into present battery
Cluster.
Cluster power instruction distribution when step 304B to 306B is for discharge condition, it is basic with the method for charged state
On the contrary, specifically can be with reference to abovementioned steps 304A to the explanation of 306A step, details are not described herein.
In the embodiment of the present application, a kind of energy storage system control method is provided, the charge and discharge shape instructed according to system power
State is ranked up battery cluster by SOC value, and the assignment order obtained according to sequence, is carried out cluster power to battery cluster one by one and is referred to
The distribution of order.In this way, the small battery cluster of SOC value can preferentially be assigned to bigger charge power, and SOC value is big in charging
Battery cluster due to lagging distribution, the charge power being assigned to can be smaller, to help speed up SOC balance between battery cluster,
And it is then exactly the opposite for discharging.As it can be seen that the embodiment of the present application provides and a kind of balanced energy storage system between battery cluster may be implemented
It unites control method, blank balanced between cluster in the prior art has been filled up, to largely reduce battery cluster to large capacity
The power limit of energy-storage system substantially increases the power output capacity of energy-storage system entirety.
The above are the detailed description to the energy storage system control method provided in second embodiment of the application, under request in person ginseng
See that Fig. 4, Fig. 4 are the flow chart of the energy storage system control method provided in the application third embodiment, this method comprises:
Step 401 obtains system power instruction.
Step 402 determines that system power instructs corresponding charging and discharging state.
Step 403, judge present battery cluster whether be the unallocated cluster power instruction of last cluster battery cluster, if so, being
Present battery cluster distribution charge/discharge power corresponds to the cluster power instruction of remaining unallocated power, terminates, otherwise, into step
Rapid 404.
The SOC ratio of step 404, the SOC value for calculating present battery cluster and average SOC value.
Step 405 calculates the current power ratio for dividing equally power and battery cluster rated power.
If step 406A, system power instructs corresponding charged state, each battery cluster is arranged by SOC value is ascending
Sequence, and the assignment order obtained according to sequence, distribute cluster power instruction one by one for battery cluster.
Step 407A, according to default control rule, determine that the SOC ratio of current power ratio and present battery cluster is common
Corresponding charging weighting coefficient.
It should be noted that the default control rule in the present embodiment is the control preestablished based on fuzzy control theory
Rule.In default control rule, to simplify the calculation, it will currently divide equally power first and be divided by with battery cluster rated power, thus
Available one power ratio in codomain between section [- 1,1], and the codomain of power ratio is divided into fill greatly, in
Fill, it is small to fill, in, it is small to put, in put, put greatly } seven power ratio subintervals, it is " big wherein " small to fill " represents small-power charging instruction
Put " high power discharge instruction is represented, and so on, Membership Function Distribution figure can refer to Fig. 5.
Then, the codomain of SOC ratio is between section [0,2], be by the codomain interval division it is small by 3, and it is small by 2, it is small by 1, in,
It is big by 1, big by 2, the subinterval of big 3 } seven, wherein number 1,2,3 indicates that the SOC value of present battery cluster deviates the degree of average SOC value,
Its Membership Function Distribution figure can refer to Fig. 6.
Finally, being directed to the combination in each power ratio subinterval and SOC ratio subinterval, a corresponding weighting is set
Coefficient.Weighting coefficient is corresponding also 6 ranks, respectively L0, L1, L2, L3, L4 and L5, and number 0~5 indicates weighting coefficient
Size degree, Membership Function Distribution figure can refer to Fig. 7.
The default control rule one of the present embodiment shares 49, for convenience of understanding, may refer to table 1.
Table 1
In table 1, λSOCCorresponding SOC ratio, Pin correspond to power ratio.Control is regular in specific application, should follow " if
Pin is xi, and λSOCIt is yj, then λ is Zm" logic.For example, if Pin is " in fill ", and λSOCIt is " big 2 ", then λ
It is L0 ", indicates that currently dividing equally power is intermediate charge power for present battery cluster, and the SOC value of the battery cluster is high
When average SOC value two-stage, the corresponding charging weighting coefficient of the battery cluster is primary weighting L0, i.e. the battery cluster will be assigned and fill
The reduced cluster power instruction of electrical power reduces the energy itself absorbed from power grid.
It should be noted that the charging weighting coefficient referred in the present embodiment and electric discharge weighting coefficient are only named
Difference, the two are substantially identical.And the setting of each weighting coefficient in above-mentioned default control rule follows following principle: putting
The battery cluster of high SOC value exports more power in electric process, and the cluster of low SOC value absorbs more power grid energy during the charging process
Amount.
Step 408A, according to the charging weighting coefficient determined, processing is weighted to power is currently divided equally.
In the present embodiment, the current processing that is decreased or increased for dividing equally power is mainly by real multiplied by corresponding weighting coefficient
Existing, if charging process, SOC ratio is smaller, and corresponding weighting coefficient is usually bigger, if discharge process, SOC ratio is got over
Greatly, corresponding weighting coefficient is usually bigger.By making different battery clusters correspond to different weighting coefficients, it is gradually reduced each
Gap between battery cluster SOC value.
Step 409A, the current cluster power instruction for dividing equally power after charge power alignment processing is distributed into present battery
Cluster.
If step 406B, system power instructs corresponding discharge condition, each battery cluster is arranged by SOC value is descending
Sequence, and the assignment order obtained according to sequence, distribute cluster power instruction one by one for battery cluster.
Step 407B, according to default control rule, determine that the SOC ratio of current power ratio and present battery cluster is common
Corresponding electric discharge weighting coefficient.
Step 408B, according to the electric discharge weighting coefficient determined, processing is weighted to power is currently divided equally.
Step 409B, the current cluster power instruction for dividing equally power after discharge power alignment processing is distributed into present battery
Cluster.
It should be noted that if finally determining cluster power instruction has exceeded the nominal discharge power or specified of battery cluster
Charge power, then still using the nominal discharge power of battery cluster or specified charge power as limit value, cluster power instruction is corresponding to be filled/
Specified charge/discharge power is not to be exceeded in discharge power.
On the other hand, it can be combined with control balanced in battery cluster.If being all not received by every default free time
System power instruction can then be such that the battery cluster carries out balanced in cluster alternatively, some battery cluster is in the non-state that puts into operation.
There are many ways to balanced in cluster, mainly divide active equalization with it is passive balanced, using maximum value in the present embodiment
Balanced active equalization strategy is balanced object with the highest monomer of cell voltage value in series-connected cell group, passes through switch arrays
The highest monomer of the column gate voltage monomer electric discharge minimum to voltage, until reaching balanced setting index.Specifically, including following
Step:
S1: all battery cells in traversal battery cluster find highest first battery cell of voltage and voltage are minimum
The second battery cell；
S2: control first battery cell discharges to second battery cell；
S3: judge whether the voltage difference between first battery cell and second battery cell is greater than predeterminated voltage
Value, if it is not, continue step S2, otherwise, return step S1, the voltage difference between any two battery cells in battery cluster
Respectively less than preset voltage value, meeting the condition, then equilibrium terminates in cluster.
In the embodiment of the present application, a kind of energy storage system control method is provided, it is right by pre-establishing default control rule
Corresponding weighting coefficient is all set in different power ratios and different SOC ratio, the setting of weighting coefficient meets
The battery cluster of high SOC value exports more power in discharge process, and the cluster of low SOC value absorbs more power grids during the charging process
The principle of energy, thus when determining the corresponding charge or discharge power of cluster power instruction that each battery cluster to be distributed, weighting
The SOC value that each battery cluster is gradually reduced is played the role of in the addition of coefficient, to realize the battery cluster of large capacity energy-storage system
Between it is balanced.As it can be seen that the embodiment of the present application provide it is a kind of balanced energy storage system control method between battery cluster may be implemented, fill up
Blank balanced between cluster in the prior art limits the power of large capacity energy-storage system to largely reduce battery cluster
System, substantially increases the power output capacity of energy-storage system entirety.
Below it is the complete application examples of energy storage system control method provided by the present application, can is this with comparative diagram 8, Fig. 8
Apply for the flow chart of the application examples for the energy storage system control method that embodiment provides.
In Fig. 8, P is the system power instruction that energy-storage system is handed down to from station level or host computer；PVolumeFor single battery
The rated output power of cluster；t1For the default free time of energy-storage system, specifically can be set to 30 minutes；T0Add for the SOC of formulation
Weight coefficient calculating cycle mark, is preset as 10 milliseconds, i.e. timer interruption is more than 10 milliseconds and is then set 1, weights entering SOC
By T after calculating0Zero setting；Min (a, b) function takes the minimum value in a and b；Max (a, b) function takes the maximum value in a and b；max
X value is then limited between a and b by (a, min (x, b)) function；"=" is assignment.
It is first determined whether meeting equilibrium condition in cluster in each polling cycle, it is equal if it is to execute maximum value in cluster
Otherwise weighing apparatus strategy enters SOC weighting control between cluster.In SOC weighting control, corresponding charge and discharge is instructed according to system power first
Electricity condition come determine weighting sequence, weight the battery cluster of high SOC value first during discharge, weight first during the charging process
The battery cluster of low SOC value.It is then transferred to the next calculating cycle of waiting after completing all cluster SOC weighting coefficients calculating in this period,
Referring specifically to Fig. 8.
The above are the detailed descriptions of the application examples to energy storage system control method provided by the embodiments of the present application.
The embodiment of the present application also provides a kind of energy-storage system control equipment, which includes processor and memory.Its
In, which is transferred to processor for storing program code by memory.Processor is used for according in program code
Instruction execution foregoing individual embodiments described in a kind of any one embodiment in energy storage system control method.
The description of the present application and term " first " in above-mentioned attached drawing, " second ", " third ", " the 4th " etc. are (if deposited
) it is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that use in this way
Data are interchangeable under appropriate circumstances, so that embodiments herein described herein for example can be in addition to illustrating herein
Or the sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of energy storage system control method characterized by comprising
Obtain system power instruction；
Determine that the system power instructs corresponding charging and discharging state；
If the charging and discharging state corresponds to charged state, match logic into charger assembled by several branch；
The charger assembled by several branch includes: with logic
The battery cluster for being higher than average SOC value for state-of-charge SOC value distributes corresponding charge power reduced cluster power instruction,
Being lower than average SOC value battery cluster for SOC value distributes corresponding charge power increased cluster power instruction；
If the charging and discharging state corresponds to discharge condition, logic is distributed into electric discharge；
The electric discharge distributes logic
The battery cluster for being higher than average SOC value for state-of-charge SOC value distributes corresponding discharge power increased cluster power instruction,
Being lower than average SOC value battery cluster for SOC value distributes corresponding discharge power reduced cluster power instruction.
2. energy storage system control method according to claim 1, which is characterized in that
After determining that the system power instructs corresponding charging and discharging state, cluster power instruction is distributed for battery cluster one by one；
The charger assembled by several branch is specifically included with logic:
If the SOC value of present battery cluster is higher than average SOC value, reduction processing is carried out to power is currently divided equally；
If the SOC value of present battery cluster is lower than average SOC value, increase processing is carried out to power is currently divided equally；
The current cluster power instruction for dividing equally power after charge power alignment processing is distributed into present battery cluster；
The electric discharge distribution logic specifically includes:
If the SOC value of present battery cluster is higher than average SOC value, increase processing is carried out to power is currently divided equally；
If the SOC value of present battery cluster is lower than average SOC value, reduction processing is carried out to power is currently divided equally；
The current cluster power instruction for dividing equally power after discharge power alignment processing is distributed into present battery cluster；
Wherein, the power of currently dividing equally is, the unallocated power at current time unallocated cluster power instruction battery cluster it
Between divide equally obtained power.
3. energy storage system control method according to claim 2, which is characterized in that the determination system power instruction
After corresponding charging and discharging state, cluster power instruction is distributed for battery cluster one by one and is specifically included:
If the system power instructs corresponding charged state, each battery cluster is ranked up by SOC value is ascending；According to sequence
Obtained assignment order distributes cluster power instruction one by one for battery cluster；
If the system power instructs corresponding discharge condition, each battery cluster is ranked up by SOC value is descending；According to sequence
Obtained assignment order distributes cluster power instruction one by one for battery cluster.
4. energy storage system control method according to claim 3, which is characterized in that distribute cluster power one by one for battery cluster and refer to
Include: before enabling
Judge present battery cluster whether be the unallocated cluster power instruction of last cluster battery cluster；
If so, distributing the cluster power instruction that charge/discharge power corresponds to remaining unallocated power for present battery cluster.
5. energy storage system control method according to claim 4, which is characterized in that further include: calculate present battery cluster
The SOC ratio of SOC value and average SOC value；
If the SOC value of the present battery cluster is higher than average SOC value, reduction processing is carried out to power is currently divided equally；If current electricity
The SOC value of pond cluster is lower than average SOC value, carries out increase processing to current respectively power and specifically includes:
According to default control rule, the corresponding charging weighting coefficient of the SOC ratio is determined；
According to the charging weighting coefficient, processing is weighted to power is currently divided equally；
If the SOC value of the present battery cluster is higher than average SOC value, increase processing is carried out to power is currently divided equally；If current electricity
The SOC value of pond cluster is lower than average SOC value, carries out reduction processing to current respectively power and specifically includes:
According to default control rule, the corresponding electric discharge weighting coefficient of the SOC ratio is determined；
According to the electric discharge weighting coefficient, processing is weighted to power is currently divided equally.
6. energy storage system control method according to claim 5, which is characterized in that further include: it calculates and currently divides equally power
With the power ratio of battery cluster rated power；
It is described regular according to default control, determine that the corresponding charging weighting coefficient of the SOC ratio specifically includes: according to default control
System rule, determines the power ratio and the SOC ratio corresponding charging weighting coefficient jointly；
It is described regular according to default control, determine that the corresponding electric discharge weighting coefficient of the SOC ratio specifically includes: according to default control
System rule, determines the power ratio and the SOC ratio corresponding electric discharge weighting coefficient jointly.
7. energy storage system control method according to claim 6, which is characterized in that the default control rule especially by
Following steps are established:
The codomain of the power ratio is divided into fill greatly, in fill, it is small fill, it is middle or small put, in put and put seven power ratio greatly
Section；
By the codomain of the SOC ratio be divided into small three-level, small second level, small level-one, in, big level-one, big second level and big three-level seven
A SOC ratio subinterval；
For the combination in each power ratio subinterval and SOC ratio subinterval, a corresponding weighting coefficient is set.
8. energy storage system control method according to claim 1, which is characterized in that also wrapped before obtaining system power instruction
It includes:
Judge whether the distance last time for getting system power instruction is greater than default free time；
If so, logic of Equilibrium in the cluster of starting battery cluster.
9. energy storage system control method according to claim 8, which is characterized in that control logic in the cluster specifically:
S1: all battery cells in traversal battery cluster, find highest first battery cell of voltage and voltage it is minimum the
Two battery cells；
S2: control first battery cell discharges to second battery cell；
S3: judging whether the voltage difference between first battery cell and second battery cell is greater than preset voltage value,
If it is not, continue step S2, and otherwise, return step S1, until the voltage difference between any two battery cells is respectively less than default electricity
Pressure value terminates.
10. a kind of energy-storage system controls equipment, which is characterized in that the equipment includes processor and memory:
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for according to the described in any item energy-storage systems of instruction execution claim 1-9 in said program code
Control method.
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