CN113794217B - Energy storage system and management method - Google Patents
Energy storage system and management method Download PDFInfo
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- CN113794217B CN113794217B CN202111084764.XA CN202111084764A CN113794217B CN 113794217 B CN113794217 B CN 113794217B CN 202111084764 A CN202111084764 A CN 202111084764A CN 113794217 B CN113794217 B CN 113794217B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
Abstract
The application provides an energy storage system and a management method, the energy storage system comprises an energy storage converter, a battery manager and a battery pack, wherein the battery pack comprises at least two groups of battery clusters, the energy storage converter is used for executing charge and discharge currents transmitted by the battery manager, the battery manager is used for acquiring the current of each group of battery clusters, the charge and discharge currents allowed by the battery pack are determined according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, and the acquired charge and discharge currents allowed by the battery pack in the next period are transmitted to the energy storage converter, so that the currents flowing through each group of battery clusters in the next period are smaller than the corresponding limiting currents. And repeatedly iterating to obtain the charge-discharge current allowed by the battery pack until the current flowing through each group of battery clusters in the next period is smaller than the corresponding limiting current, so that the overcurrent condition is avoided, and the safety of the energy storage system is ensured.
Description
Technical Field
The application relates to the field of power systems, in particular to an energy storage system and a management method.
Background
With the development and scientific progress of society, energy plays an important role in the life of people. Electric energy is used as the most closely related energy source to people's life, and is widely applied to various industries and fields. The supply capacity of electric energy is closely related to the life of people.
Due to living habits and working hours, the current power supply network has the phenomena of power utilization wave peaks and power utilization wave troughs. In order to supplement the residual electric energy in the power utilization wave trough to the power supply network in the power utilization wave crest, the electric power energy storage system is generated at the same time. It is understood that the electrical energy storage system is used to store the electrical energy remaining at a power utilization trough and to supplement the stored electrical energy into the supply grid at a power utilization peak.
In the prior art, an electric energy storage system includes a plurality of battery clusters for storing and releasing electric energy. How to ensure the safety of each battery cluster in the charging and discharging process becomes a difficult problem which puzzles the technical personnel in the field.
Disclosure of Invention
The present application is directed to an energy storage system and a management method to at least partially improve the above problems.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, an embodiment of the present application provides an energy storage system, where the energy storage system includes an energy storage converter, a battery manager, and a battery pack, where the battery pack includes at least two groups of battery clusters, a positive end of each group of battery clusters is connected to a first end of the energy storage converter, a negative end of each group of battery clusters is connected to a second end of the energy storage converter, each group of battery clusters is connected to the battery manager, and the battery manager is connected to the energy storage converter;
the energy storage converter is used for executing charge and discharge current transmitted by the battery manager;
the battery manager is used for obtaining the current of each group of battery clusters, determining the charging and discharging current allowed by the battery pack according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, and transmitting the obtained charging and discharging current allowed by the battery pack to the energy storage converter, so that the current flowing through each group of battery clusters is smaller than the corresponding limiting current.
In a possible implementation manner, the battery manager is configured to obtain a current of each group of battery clusters, repeatedly determine, according to the current of each group of battery clusters and a limiting current corresponding to each group of battery clusters, a charging and discharging current allowed by the battery pack in a next period, so that the current flowing through each group of battery clusters in the next period is smaller than the corresponding limiting current, and transmit the obtained charging and discharging current allowed by the battery pack in the next period to the energy storage converter;
in one possible implementation, the battery manager is further configured to obtain a current limit current for each group of battery clusters.
In a possible implementation manner, the battery manager is further configured to, in a case that a present current of any one group of battery clusters is greater than a corresponding limit current, reduce a present-period total current to determine a charge/discharge current allowed for the battery pack in a next period;
and the battery manager is also used for increasing the total current in the current period when the current of each group of battery clusters is smaller than the corresponding limit current so as to determine the charge and discharge current allowed by the battery pack in the next period.
In one possible implementation manner, the battery manager determines the allowable charging and discharging current of the battery pack in the next period through the following formula;
I pregross ＝|I General assembly |-n*max{|I 1 |-I 1limit ，|I 2 |-I 2limit ，...，|I n |-I nlimit }；
Wherein, I General assembly Characterizing the total current, I, of the current cycle Pregross Characterizing the allowable charging and discharging current, I, of the battery in the next period x Characterizing the present Current, I, of the x-th group of Battery clusters xlimit The limiting current of the x-th group of battery clusters is represented, and n represents the total group number of the battery clusters.
In a possible implementation manner, the battery manager includes at least two sets of battery management units and a set of integrated management unit, the number of the battery management units is the same as the number of the battery clusters, each set of battery management unit is connected with a corresponding battery cluster, each set of battery management unit is connected with the integrated management unit, and the integrated management unit is connected with the energy storage converter.
In a second aspect, an embodiment of the present application provides an energy storage system management method, which is applied to an energy storage system, where the energy storage system includes an energy storage converter, a battery manager, and a battery pack, where the battery pack includes at least two groups of battery clusters, a positive end of each group of battery clusters is connected to a first end of the energy storage converter, a negative end of each group of battery clusters is connected to a second end of the energy storage converter, each group of battery clusters is connected to the battery manager, and the battery manager is connected to the energy storage converter;
the energy storage converter executes charge and discharge current transmitted by the battery manager;
the battery manager acquires the current of each group of battery clusters, determines the charging and discharging current allowed by the battery pack according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, and transmits the acquired charging and discharging current allowed by the battery pack to the energy storage converter, so that the current flowing through each group of battery clusters is smaller than the corresponding limiting current.
In a possible implementation manner, the battery manager obtains a current of each group of battery clusters, determines a charging and discharging current allowed by the battery pack in a next period according to the current of each group of battery clusters and a limiting current corresponding to each group of battery clusters, so that the current flowing through each group of battery clusters in the next period is smaller than the corresponding limiting current, and transmits the obtained charging and discharging current allowed by the battery pack in the next period to the energy storage converter;
and the battery manager repeatedly acquires the current of each group of battery clusters, and determines the allowed charging and discharging current of the battery pack in the next period according to the current of each group of battery clusters and the limited current corresponding to each group of battery clusters.
In one possible implementation, before determining the charge and discharge current allowed by the battery pack in the next period, the method further includes:
the battery manager obtains the current limiting current of each group of battery clusters.
In a possible implementation manner, the step of determining, according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, a charging/discharging current allowed by the battery pack in a next period includes:
the battery manager reduces the total current of the current period under the condition that the current of any group of battery clusters is greater than the corresponding limiting current so as to determine the charge-discharge current allowed by the battery pack in the next period;
and when the current of each battery pack cluster is smaller than the corresponding limiting current, the battery manager increases the total current in the current period to determine the allowable charging and discharging current of the battery pack in the next period.
In one possible implementation manner, the battery manager determines the allowed charge and discharge current of the battery pack in the next period through the following formula;
I pregross ＝|I General assembly |-n*max{|I 1 |-I 1limit ，|I 2 |-I 2limit ，...，|In|-
I n limit}；
Wherein, I is used for characterizing the total current of the current period, I is used for characterizing the allowed charging and discharging current of the battery pack in the next period, Ix is used for characterizing the current of the battery cluster of the x group, and Ix is used for characterizing the current of the battery cluster of the x group limit The limiting current of the x-th group of battery clusters is represented, and n represents the total group number of the battery clusters.
In a possible implementation manner, the battery manager includes at least two sets of battery management units and a set of integrated management unit, the number of the battery management units is the same as the number of the battery clusters, each set of battery management unit is connected with a corresponding battery cluster, each set of battery management unit is connected with the integrated management unit, and the integrated management unit is connected with the energy storage converter.
Compared with the prior art, the energy storage system provided by the embodiment of the application comprises an energy storage converter, a battery manager and a battery pack, wherein the battery pack comprises at least two groups of battery clusters, the positive end of each group of battery clusters is connected to the first end of the energy storage converter, the negative end of each group of battery clusters is connected to the second end of the energy storage converter, each group of battery clusters is connected with the battery manager, and the battery manager is connected with the energy storage converter; the battery management device is used for acquiring the current of each group of battery clusters, determining the charging and discharging current allowed by the battery pack according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, so that the current flowing through each group of battery clusters is smaller than the corresponding limiting current, and transmitting the acquired charging and discharging current allowed by the battery pack to the energy storage converter. After the allowable charging and discharging current of the battery pack is changed, the current flowing through each battery cluster may be changed. And obtaining the charging and discharging current allowed by the battery pack until the current flowing through each group of battery clusters is smaller than the corresponding limiting current, so that the overcurrent condition can not occur, and the safety of the energy storage system is ensured.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery manager according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for managing an energy storage system according to an embodiment of the present disclosure;
fig. 4 is a schematic view of the substep of S103 according to an embodiment of the present application.
In the figure: 101-an energy storage converter; 102-a battery pack; 103-battery manager.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The power storage system includes a plurality of battery clusters for storing electrical energy and releasing electrical energy. It can be understood that the internal resistances of each battery cluster may not be identical, and the lengths of the wires from each battery cluster to the energy storage converter (PCS) are not identical, that is, the wire resistances are not identical, and the battery clusters are in parallel connection, so the voltages of the battery clusters are identical. Resulting in different values of the discharge current or the charge current for different battery clusters. Taking an example that the energy storage system includes 3 battery clusters, the rated current corresponding to each battery cluster is 100 milliamperes, and at this time, the total rated current of the energy storage system is 300 milliamperes. If the current of 300 milliamperes is used for discharging, the current of each battery cluster is not identical, and the discharging current of some battery clusters is larger than 100 milliamperes, and the discharging current of some battery clusters is smaller than 100 milliamperes. Therefore, the overcurrent phenomenon exists, and the potential safety hazard is caused.
With reference to the above example, the discharging current or the charging current of the battery clusters are different, and it is inevitable that the discharging or charging speed of some battery clusters is fast. The discharging situation is explained, a part of the battery clusters may be completely discharged, and when the electric quantity is in an empty state, the part of the battery clusters are still in a partial discharging state, and a lot of residual electric quantity exists. However, in such a case, the discharge cannot be continued, but the charging is performed synchronously, the electric energy in other battery clusters cannot be well utilized, and the capacity of the battery energy storage system can be degraded too fast.
In order to overcome the above problem, embodiments of the present application provide an energy storage system. Referring to fig. 1, fig. 1 is a schematic diagram of an energy storage system architecture according to an embodiment of the present disclosure. The energy storage system comprises an energy storage converter 101, a battery manager 103 and a battery pack 102, wherein the battery pack 102 comprises at least two groups of battery clusters. The battery clusters are shown as Rack1, Rack2, Rack3 and Rack in FIG. 1. The number of battery clusters shown in fig. 1 is 4, but the present invention is not limited thereto, and two or more battery clusters may be present.
Referring to fig. 1, the positive terminal of each battery cluster is connected to the first end of the energy storage converter 101, the negative terminal of each battery cluster is connected to the second end of the energy storage converter 101, each battery cluster is connected to the battery manager 103, and the battery manager 103 is connected to the energy storage converter.
The energy storage converter 101 is used for executing charging and discharging current transmitted by the battery manager 103.
Specifically, after the energy storage converter 101 receives the charging and discharging current allowed by the battery pack 102 transmitted by the battery manager 103, the energy storage converter 101 can adjust the current of each battery cluster based on its own current distribution logic, so that the sum of the currents flowing through the battery clusters is equal to the charging and discharging current allowed by the battery pack 102.
The battery manager 103 is configured to obtain a current of each group of battery clusters, determine, according to the current of each group of battery clusters and a limiting current corresponding to each group of battery clusters, a charging and discharging current allowed by the battery pack 102, so that the current flowing through each group of battery clusters is smaller than the corresponding limiting current, and transmit the obtained charging and discharging current allowed by the battery pack 102 to the energy storage converter 101.
It will be appreciated that the present current may be the actual charging current or discharging current. Specifically, when the energy storage system is in a charging state, the present current is a charging current, and when the energy storage system is in a discharging state, the present current is a discharging current.
It is understood that after the allowable charge and discharge current of the battery pack 102 is changed, the current flowing through each battery cluster may be changed. In a possible implementation manner, the charging and discharging currents allowed by the battery pack 102 are repeatedly obtained in an iterative manner until the currents flowing through each group of battery clusters in the next period are all smaller than the corresponding limiting currents, and the overcurrent condition cannot occur if the currents are all smaller than the corresponding limiting currents, so that the safety of the energy storage system is guaranteed.
In summary, the embodiment of the present application provides an energy storage system, which includes an energy storage converter, a battery manager and a battery pack, where the battery pack includes at least two groups of battery clusters, a positive end of each group of battery clusters is connected to a first end of the energy storage converter, a negative end of each group of battery clusters is connected to a second end of the energy storage converter, each group of battery clusters is connected to the battery manager, and the battery manager is connected to the energy storage converter; the battery management device comprises an energy storage converter, a battery manager and a battery pack, wherein the energy storage converter is used for executing charge and discharge currents transmitted by the battery manager, the battery manager is used for acquiring the current of each group of battery clusters, determining the charge and discharge currents allowed by the battery pack according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, so that the currents flowing through each group of battery clusters are smaller than the corresponding limiting currents, and transmitting the acquired charge and discharge currents allowed by the battery pack to the energy storage converter. After the allowable charging and discharging current of the battery pack is changed, the current flowing through each battery cluster may be changed. And obtaining the charging and discharging current allowed by the battery pack until the current flowing through each group of battery clusters is smaller than the corresponding limiting current, so that the overcurrent condition can not occur, and the safety of the energy storage system is ensured.
In a possible implementation manner, the battery manager 103 is configured to obtain a current of each group of battery clusters, repeatedly determine, according to the current of each group of battery clusters and a limiting current corresponding to each group of battery clusters, a charging and discharging current allowed by the battery pack 102 in a next period, so that the current flowing through each group of battery clusters in the next period is smaller than the corresponding limiting current, and transmit the obtained charging and discharging current allowed by the battery pack 102 in the next period to the energy storage converter 101.
In a possible implementation manner, if it is satisfied that the current flowing through each group of battery clusters in the current period is less than the corresponding limiting current and the subsequent limiting current is not changed, the battery manager 103 may not iterate for the moment, that is, may not obtain the charging and discharging current allowed by the battery pack 102 in the next period again for the moment. The energy storage converter 101 may perform a current conversion operation according to the last received charging and discharging current.
Of course, the battery manager 103 may repeatedly iterate the charging and discharging currents allowed by the battery pack 102 in the next cycle.
In order to further improve the balance performance and the security performance of the storage system, the embodiment of the present application further provides a possible implementation manner, please refer to the following.
The battery manager 103 is also used to obtain the current limit current of each group of battery clusters.
It is understood that the discharge current or the charge current of the battery clusters are different, and the remaining capacity (or, the potential energy E) of the battery clusters may change after a certain time, so that the remaining capacity of each battery cluster is not exactly the same. At this time, the limiting current or rated current corresponding to each group of battery clusters changes. To further improve the balance performance and the safety performance of the storage system, the battery manager 103 needs to acquire the current limit current of each group of battery clusters. In one possible implementation, the current limiting current of each battery cluster set can be determined according to the current remaining capacity of each battery cluster set.
The embodiment of the present application also provides a possible implementation manner of how to determine the allowed charging and discharging current of the battery pack in the next period, please refer to the following.
The battery manager 103 is further configured to reduce the total current in the current cycle to determine a charging/discharging current allowed for the battery pack in the next cycle, if the current of any group of battery clusters is greater than the corresponding limit current.
With continued reference to fig. 1, assume that the current of each of the battery clusters Rack1, Rack2, Rack3 and Rack n in fig. 1 is I 1 、I 2 、I 3 And I n Respectively corresponding to limiting currents of I 1limit 、I 2limit 、I 3limit And I nlimit . When I 1 | is greater than I 1limit 、|I 2 | is greater than I 2limit 、|I 3 | is greater than I 3limit And | I n | is greater than I nlimit When any one of the above is satisfied, it indicates that the overcurrent phenomenon exists. The allowable charge and discharge current of the battery pack 102 needs to be reduced in the next cycle. Specifically, the allowable charge and discharge current of the battery pack 102 is reduced based on the current cycle. The allowable charging and discharging current of the battery pack 102 in the current period is I 1 、I 2 、I 3 And I n The sum of (a) and (b).
The battery manager 103 is further configured to increase the total current in the current cycle when the current of each group of battery clusters is smaller than the corresponding limit current, so as to determine the charging and discharging current allowed for the battery group in the next cycle.
Please continue to refer to the above example when I 1 | is less than I 1limit 、|I 2 | is less than I 21imit 、|I 3 | is less than I 3limit And | I n | is less than I nlimit When all of them are satisfied, it is said that the battery system is not fully used. The allowable charge and discharge current of the battery pack 102 needs to be increased in the next cycle. Specifically, the charging/discharging current allowed by the battery pack 102 increases based on the current cycle. The allowable charging and discharging current of the battery pack 102 in the current period is I 1 、I 2 、I 3 And I n The sum of (a) and (b).
Regarding the equation for determining the allowable charging and discharging current of the battery pack in the next period, the embodiment of the present application also provides a possible implementation manner, please refer to the following.
The battery manager 103 determines the allowed charge and discharge current of the battery pack in the next period according to the following formula;
I pregross ＝|I General assembly |-n*max{|I 1 |-I 1limit ，|I 2 |-I 2limit ，...，|I n |-I nlimit }；
Wherein, I General assembly Characterizing the total current, I, of the current cycle Pregross Characterizing allowable charge and discharge current of battery pack in next period，I x Characterizing the present Current, I, of the x-th group of Battery clusters xlimit The limiting current of the x-th group of battery clusters is represented, and n represents the total group number of the battery clusters.
Taking the number of the battery clusters as 3 as an example, the current of each of the battery clusters Rack1, Rack2 and Rack3 is I 1 、I 2 、I 3 Respectively corresponding to limiting currents of I 1limit 、I 2limit 、I 3limit . Let I 1limit 、I 2limit 、I 3limit Are all 100, and I is obtained in the jth period 1 ＝60、I 2 ＝50、I 3 ＝40，I General (1) ＝I 1 +I 2 +I 3 ＝150。
I Pregross ＝|I General assembly |-n*max{|I 1 |-I 1limit ，|I 2 |-I 2limit ，...，|I n |-I nlimit }；
I Pregross ＝150-3*max{(-40)，(-50)，(-60)}＝150+120＝270；
Acquire I in the j +1 th cycle 1 ＝135、I 2 ＝90、I 3 ＝45，I General assembly ＝I 1 +I 2 +I 3 ＝270；
I Pregross ＝270-3*35＝165。
So that I k | is close to I klimit And | I q | is less than I qlimit ，|I k I is the absolute value of the current of the kth battery cluster with the largest current, and I q And | is other battery clusters except the kth battery cluster.
Understandably, the maximum difference (| I) with the release or storage of electrical potential energy x |-I xlimit ) The corresponding battery cluster is changed, pair I Pregross The affected battery clusters are changed, so that each battery cluster can affect I to a certain extent Pregross So that the charge or discharge of each battery cluster is balanced to some extent; the difference of current among different battery clusters is reduced, and the allowable charging and discharging current of the battery pack in the next period (namely PCS) is adjusted according to the maximum value of the currentRated current) so that the current value in each battery cluster can be fully released, and the condition that the energy of the battery cluster is not fully released is avoided.
Wherein the maximum difference is | I x |-I xlimit The highest value of (d).
It is understood that each of the battery clusters is in a parallel state with each other during the charge and discharge processes. The voltage of each cell cluster pair is the same. However, as the charging and discharging are performed with currents of different magnitudes, the remaining capacity of each battery cluster is different, and thus the potential energy E of each battery cluster is different.
Please refer to the following equation, in the charging state: U-E-IR; in the discharge state: u ═ E + IR.
In order to keep the voltage of each battery cluster the same, the corresponding current value of the battery cluster of the potential energy E is decreased. I.e. the maximum difference (| I) x |-I xlimit ) The corresponding battery cluster is changing.
Referring to fig. 2, regarding the composition of the battery manager 103, the embodiment of the present application also provides a possible implementation manner. As shown in fig. 2, the battery manager 103 includes at least two sets of battery management units (RBMS) and a set of comprehensive management unit (BBMS), the number of the battery management units is the same as the number of the battery clusters, each set of battery management units is connected to the corresponding battery cluster, each set of battery management units is connected to the comprehensive management unit, and the comprehensive management unit is connected to the energy storage converter 101.
The battery management unit RBMS is configured to obtain performance parameters of the corresponding battery cluster, such as a current remaining capacity, a current, a current limit current, a current temperature, and the like. And transmitting the collected performance parameters to a comprehensive management unit BBMS.
The integrated management unit BBMS is used to determine the allowed charging and discharging current of the battery pack 102 in the next period.
In one possible implementation, the energy storage converter 101 is connected to an external main grid through a transformer, so that the energy storage system can buffer and release electric energy.
It should be noted that, in the embodiment of the present application, the battery clusters are in a parallel relationship, that is, voltages at two ends of each battery cluster are the same. It is known to the person skilled in the art that the power versus voltage and current, where the voltages are the same, the definition of current may be equivalent to the definition of power. Therefore, the current in the embodiment of the present application may be equal to the current power, the limiting current may be equal to the limiting power, and the charging and discharging current may be equal to the charging and discharging power, which is not described herein again.
It should be understood that the configurations shown in fig. 1 and 2 are merely schematic structural illustrations of portions of an energy storage system, which may also include more or fewer components than shown in fig. 1 and 2, or have a different configuration than shown in fig. 1 and 2. The components shown in fig. 1 and 2 may be implemented in hardware, software, or a combination thereof.
The energy storage system management method provided in the embodiment of the present application may be applied to, but is not limited to, the electronic devices shown in fig. 1 and fig. 2, and please refer to fig. 3, where the energy storage system management method includes:
and S101, the energy storage converter executes the charging and discharging current transmitted by the battery manager.
And S302, the battery manager acquires the current of each group of battery clusters.
And S303, determining the allowed charging and discharging current of the battery pack by the battery manager according to the current of each group of battery clusters and the limited current corresponding to each group of battery clusters.
And S304, transmitting the acquired charging and discharging current allowed by the battery pack to an energy storage converter.
In one possible implementation, after performing S304, S101 may be repeatedly performed such that the current flowing through each group of battery clusters in the next cycle is less than the corresponding limiting current.
In a possible implementation manner, in S303, the battery manager determines the allowed charging and discharging current of the battery pack in the next period according to the current of each battery cluster and the limited current corresponding to each battery cluster. And S304, transmitting the acquired charging and discharging current allowed by the battery pack in the next period to the energy storage converter.
With continued reference to fig. 3, in one possible implementation manner, the energy storage system management method further includes:
and S301, the battery manager acquires the current limiting current of each group of battery clusters.
It should be noted that the embodiment of the present application does not limit the execution sequence of S302 and S301, and both may be executed simultaneously or separately.
On the basis of fig. 3, regarding the content in S103, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 4, where S103 includes:
s103-1, under the condition that the current of any group of battery clusters is larger than the corresponding limiting current, the battery manager reduces the total current in the current period to determine the charge and discharge current allowed by the battery pack in the next period.
And S103-2, when the current of each group of battery clusters is smaller than the corresponding limiting current, the battery manager increases the total current in the current period to determine the charge and discharge current allowed by the battery group in the next period.
In one possible implementation manner, the battery manager determines the allowed charge and discharge current of the battery pack in the next period through the following formula;
I pregross ＝|I General assembly |-n*max{|I 1 |-I 1limit ，|I 2 |-I 2limit ，...，|I n |-I nlimit }；
Wherein, I General assembly Characterizing the total current, I, of the current cycle Pregross Characterizing the allowable charging and discharging current of the battery in the next period, I x Characterizing the present Current, I, of the x-th group of Battery clusters xlimit The limiting current of the x-th battery cluster is represented, and the total group number of the battery clusters is represented by n.
In a possible implementation manner, the battery manager comprises at least two groups of battery management units and one group of comprehensive management unit, the number of the battery management units is the same as that of the battery clusters, each group of battery management units is respectively connected with the corresponding battery clusters, each group of battery management units is connected with the comprehensive management unit, and the comprehensive management unit is connected with the energy storage converter.
It should be noted that the energy storage system management method provided in this embodiment may perform the functional uses of each part in the above-mentioned energy storage system embodiment, so as to achieve the corresponding technical effects. For the sake of brevity, the corresponding contents in the above embodiments may be referred to where not mentioned in this embodiment.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. An energy storage system is characterized by comprising an energy storage converter, a battery manager and a battery pack, wherein the battery pack comprises at least two groups of battery clusters, the positive end of each group of battery clusters is connected to the first end of the energy storage converter, the negative end of each group of battery clusters is connected to the second end of the energy storage converter, each group of battery clusters is connected with the battery manager, and the battery manager is connected with the energy storage converter;
the energy storage converter is used for executing charge and discharge current transmitted by the battery manager;
the battery manager is further used for acquiring the current limiting current of each group of battery clusters and determining the current limiting current of each group of battery clusters according to the current residual capacity of each group of battery clusters;
the battery manager is used for acquiring the current of each group of battery clusters, determining the charge-discharge current allowed by the battery pack according to the current of each group of battery clusters and the limit current corresponding to each group of battery clusters, and transmitting the acquired charge-discharge current allowed by the battery pack to the energy storage converter, so that the current flowing through each group of battery clusters is smaller than the corresponding limit current;
the battery manager is further used for repeatedly determining the charging and discharging current allowed by the battery pack in the next period according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, so that the current flowing through each group of battery clusters in the next period is smaller than the corresponding limiting current, and transmitting the obtained charging and discharging current allowed by the battery pack in the next period to the energy storage converter;
the battery manager is also used for reducing the total current in the current period under the condition that the current of any group of battery clusters is greater than the corresponding limiting current so as to determine the charge and discharge current allowed by the battery pack in the next period;
the battery manager is further used for increasing the total current in the current period when the current of each battery pack cluster is smaller than the corresponding limiting current so as to determine the charge and discharge current allowed by the battery pack in the next period;
the battery manager determines the allowable charging and discharging current of the battery pack in the next period through the following formula;
I pregross ＝∣I General assembly ∣-n*max{∣I 1 ∣-I 1limit ，∣I 2 ∣-I 2limit ，…，∣I n ∣-I nlimit }；
Wherein, I General (1) Characterizing the total current, I, of the current cycle Pregross Characterizing the allowable charging and discharging current, I, of the battery in the next period x Characterizing the present Current, I, of the x-th group of Battery clusters xlimit The limiting current of the x-th group of battery clusters is represented, and n represents the total group number of the battery clusters.
2. The energy storage system of claim 1, wherein the battery manager comprises at least two groups of battery management units and a group of comprehensive management unit, the number of the battery management units is the same as the number of the battery clusters, each group of battery management units is respectively connected with the corresponding battery clusters, each group of battery management units is connected with the comprehensive management unit, and the comprehensive management unit is connected with the energy storage converter.
3. The energy storage system management method is applied to an energy storage system, the energy storage system comprises an energy storage converter, a battery manager and a battery pack, the battery pack comprises at least two groups of battery clusters, the positive end of each group of battery clusters is connected to the first end of the energy storage converter, the negative end of each group of battery clusters is connected to the second end of the energy storage converter, each group of battery clusters is connected with the battery manager, and the battery manager is connected with the energy storage converter;
the energy storage converter executes charge and discharge current transmitted by the battery manager;
the battery manager acquires the current limiting current of each group of battery clusters and determines the current limiting current of each group of battery clusters according to the current residual capacity of each group of battery clusters;
the battery manager acquires the current of each group of battery clusters, determines the charge-discharge current allowed by the battery pack according to the current of each group of battery clusters and the limit current corresponding to each group of battery clusters, and transmits the acquired charge-discharge current allowed by the battery pack to the energy storage converter, so that the current flowing through each group of battery clusters is smaller than the corresponding limit current;
the battery manager repeatedly determines the charging and discharging current allowed by the battery pack in the next period according to the current of each group of battery clusters and the limiting current corresponding to each group of battery clusters, so that the current flowing through each group of battery clusters in the next period is smaller than the corresponding limiting current, and the obtained charging and discharging current allowed by the battery pack in the next period is transmitted to the energy storage converter;
the step of determining the allowed charging and discharging current of the battery pack in the next period according to the current of each group of battery clusters and the limited current corresponding to each group of battery clusters comprises the following steps:
the battery manager reduces the total current of the current period under the condition that the current of any group of battery clusters is greater than the corresponding limiting current so as to determine the charge-discharge current allowed by the battery pack in the next period;
when the current of each battery pack cluster is smaller than the corresponding limiting current, the battery manager increases the total current in the current period to determine the charge-discharge current allowed by the battery pack in the next period;
the battery manager determines the allowable charging and discharging current of the battery pack in the next period through the following formula;
I pregross ＝∣I General assembly ∣-n*max{∣I 1 ∣-I 1limit ，∣I 2 ∣-I 2limit ，…，∣I n ∣-I nlimit }；
Wherein, I General (1) Characterizing the total current, I, of the current cycle Pregross Characterizing the allowable charging and discharging current, I, of the battery in the next period x Characterizing the present Current, I, of the x-th group of Battery clusters xlimit The limiting current of the x-th group of battery clusters is represented, and n represents the total group number of the battery clusters.
4. The energy storage system management method according to claim 3, wherein the battery manager includes at least two sets of battery management units and a set of integrated management unit, the number of the battery management units is the same as the number of the battery clusters, each set of battery management units is respectively connected with a corresponding battery cluster, each set of battery management units is connected with the integrated management unit, and the integrated management unit is connected with the energy storage converter.
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| CN202111084764.XA CN113794217B (en) | 2021-09-16 | 2021-09-16 | Energy storage system and management method |
| PCT/CN2022/115497 WO2023040642A1 (en) | 2021-09-16 | 2022-08-29 | Energy storage system and management method |
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| CN101888098B (en) * | 2009-05-15 | 2012-08-29 | 中达电通股份有限公司 | Power supply method of communication equipment with high reliability |
| CN103199312B (en) * | 2012-01-04 | 2016-01-20 | 艾默生网络能源系统北美公司 | The management method of battery current and device |
| US10790679B2 (en) * | 2014-09-26 | 2020-09-29 | Mitsumi Electric Co., Ltd. | Battery protection circuit and device, battery pack, and battery protection method |
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| KR102392376B1 (en) * | 2015-08-20 | 2022-04-29 | 삼성에스디아이 주식회사 | Battery system |
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| JP2015050813A (en) * | 2013-08-30 | 2015-03-16 | ミツミ電機株式会社 | Battery protection circuit, battery protection device, battery pack, and battery protection method |
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