CN114050621B - Distributed energy storage power distribution system and method - Google Patents
Distributed energy storage power distribution system and method Download PDFInfo
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- CN114050621B CN114050621B CN202111280534.0A CN202111280534A CN114050621B CN 114050621 B CN114050621 B CN 114050621B CN 202111280534 A CN202111280534 A CN 202111280534A CN 114050621 B CN114050621 B CN 114050621B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 description 6
- 101100001915 Drosophila melanogaster Hmu gene Proteins 0.000 description 3
- 101100017564 Haloquadratum walsbyi (strain DSM 16790 / HBSQ001) hmu gene Proteins 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
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Classifications
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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
- 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
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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
- 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
- H02J7/0025—Sequential battery discharge in systems with a plurality of batteries
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a distributed energy storage power distribution system and a distributed energy storage power distribution method, wherein the distributed energy storage power distribution system comprises a total battery management system which is in communication connection with each battery cluster; the energy storage converters are respectively and electrically connected with the battery clusters through the direct current branch circuit; each battery cluster management module is used for summarizing each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit, each battery cluster management module is used for summarizing the battery management units corresponding to the batteries in each battery cluster, and each battery cluster management module is used for summarizing a total battery management system; the battery management high-voltage boxes are respectively and electrically connected with the battery clusters through the direct-current branch circuit, and are arranged in one-to-one correspondence with the battery clusters; and a monitoring system for connecting to the overall battery management system. The invention is not only beneficial to realizing large-area popularization and application, but also avoids expanding the capacity through adjusting the interface.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to a distributed energy storage power distribution system and a distributed energy storage power distribution method.
Background
In recent years, with the vigorous development of smart grids, renewable (photovoltaic) energy power generation, distributed power generation and micro-grids, and electric automobiles, research and application of energy storage technologies are increasingly receiving attention from all countries in the world, and demands of industry and commerce for higher power supply reliability, micro-grid technologies are rapidly developed. The renewable energy sources are greatly influenced by the meteorological environment, the defect of intermittent operation is overcome, the energy storage system is used as an energy storage system, the time or local difference between energy supply and demand of new energy source power generation is overcome, and the renewable energy sources are important components of the micro-grid. The distributed energy storage system has wide application prospect, the application of the distributed energy storage system relates to each link in the power distribution system, the function of the distributed energy storage equipment is fully exerted, the running reliability of the system can be effectively improved, the electric energy quality of the system is improved, the intervention capacity of renewable energy sources of a power distribution network is improved, the economic benefits of a power grid and users are increased, and a powerful support is provided for the development of the intelligent power distribution network. Compared with a large-scale centralized energy storage system, the distributed energy storage system has less limit on the environment and natural conditions of an access position, the mode of accessing the power grid is more flexible, and unique functions can be exerted on the power distribution network, the micro-grid, the distributed power source side and the user side. As the invention patent application publication number CN109842138a, a power distribution method of a distributed energy storage system and a system controller thereof are disclosed, the method comprises: the distributed energy storage system comprises a system controller, a client control unit and a plurality of distributed energy storage nodes, and the power distribution method comprises the following steps: the system controller receives a real-time value and an SOC real-time value of the power limiting value, which are sent by each battery cluster energy storage node according to the power limiting value and the change speed of the SOC; the system controller receives the target demand value of the client power sent by the client control unit; the system controller determines the power distributed to each distributed energy storage node according to the target demand value of the client power, the real-time value of the power limiting value of each distributed energy storage node and the real-time value of the SOC; the system controller sends the distributed power corresponding to each distributed energy storage node to enable each distributed energy storage node to output the distributed power corresponding to each distributed energy storage node. The real-time distribution of the power is carried out according to the change speed of the parameters, and the consistency and the real-time performance of the overall control of the system can be improved.
For a battery management system (energy storage BMS system) in a distributed energy storage system as an important management system responsible for monitoring the battery state and protecting the operation of a lithium battery, the battery management system (energy storage BMS system) is generally composed of a three-level architecture of a battery pack management system, a battery cluster management system and a battery stack management system, wherein the battery stack management system (ABMS) is used as the uppermost management unit of the whole battery management system (energy storage BMS system), is an external window of the whole energy storage system, and has more realization requirements. As shown in fig. 1, the energy scheduling of the existing distributed energy storage system is generally performed by linking an external energy storage converter (PCS) through a total bus, and an upper Energy Management System (EMS) is required to set and clear the power of the energy storage converter (PCS), which has the following disadvantages:
Firstly, compared with a centralized energy storage system, the capacity of the distributed energy storage system is smaller, the application scene is simpler, and in this case, a set of Energy Management System (EMS) is still needed by a user to control the operation of the whole AC/DC system, which clearly increases the construction and maintenance cost;
Secondly, the battery management system (energy storage BMS system) and the Energy Management System (EMS) are mutually independent, and the power scheduling among clusters of the battery management system (energy storage BMS system) is generally determined by the battery voltage and the internal resistance, so that the inter-cluster active equalization cannot be realized through the inter-cluster power scheduling;
Third, in the prior art, an energy storage system generally uses an energy storage converter (PCS) with a fixed capacity and a fixed power, and a battery management system (energy storage BMS system) generally only manages a direct-current battery, but cannot participate in the operation of an Energy Management System (EMS), in which case the capacity expansion or reduction generally needs to replace the energy storage converter (PCS) or change the Energy Management System (EMS), so that the investment of cost is greatly increased.
Disclosure of Invention
First, the technical problems to be solved
In order to overcome the defects in the prior art, the invention provides a distributed energy storage power distribution system and a distributed energy storage power distribution method, which are convenient to combine and adjust the capacity and the power, and are more beneficial to meeting the use requirements.
(II) technical proposal to be adopted
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A distributed energy storage power distribution system comprising
A total battery management system in communication with each battery cluster;
the energy storage converters are respectively and electrically connected with the battery clusters through the direct current branch;
Each battery cluster management module is used for summarizing each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit, each battery cluster management module is used for summarizing the battery management units corresponding to the batteries in each battery cluster, and each battery cluster management module is used for summarizing the total battery management system;
The battery management high-voltage boxes are respectively and electrically connected with the battery clusters through the direct-current branch circuits, wherein the battery management high-voltage boxes are arranged in one-to-one correspondence with the battery clusters;
And the monitoring system is used for being connected with the total battery management system.
Preferably, each of the battery cluster management modules is connected with the total battery management system through a CAN bus and a LAN bus.
Preferably, each battery cluster management module is connected through a CAN bus for a battery management unit corresponding to a battery in each battery cluster.
Preferably, the monitoring system is connected to the overall battery management system via a LAN bus.
In addition, the invention also provides a distributed energy storage power distribution method which is applied to the distributed energy storage power distribution system, and the distributed energy storage power distribution method comprises the steps that the monitoring system obtains an electric quantity power requirement P w from an external interface, then the total battery management system can charge and discharge according to the chargeable and dischargeable power limits of the batteries in the battery cluster management modules, and meanwhile, the total battery management system controls the output of the energy storage converters of the clusters according to a calculation result.
When the monitoring system acquires the electric quantity power demand P w from an external interface and judges whether the battery needs to be charged or not, if the battery needs to be charged, the total battery management system obtains the sum P i1 of the chargeable power limits of the battery cluster management modules according to the chargeable power limits of the batteries in the battery cluster management modules, and when the electric quantity power demand P w＞Pi1 is met, the total battery management system charges the battery according to the chargeable maximum power of the batteries in the battery cluster management modules, and the battery management system charges the battery according to the chargeable power limits of the batteries in the battery cluster management modules; when the battery cluster management module is not required to be charged, the total battery management system obtains the sum P i2 of the dischargeable power limits of the battery cluster management modules according to the dischargeable power limits of the batteries in the battery cluster management modules, and when the electric quantity power is required to be P w＞Pi2, the total battery management system discharges according to the dischargeable maximum power of the batteries in the battery cluster management modules, and the battery management system discharges according to the dischargeable power limits of the batteries in the battery cluster management modules.
When the electric quantity power demand P w≤Pi1 is met, the total battery management system receives real-time values and SOC real-time values of the power limiting values sent by each battery cluster management module according to the power limiting values and the SOC variation speed according to each battery cluster management module, the total battery management system distributes charging power according to the chargeable capacity proportion of each battery cluster management module, when the charging power distributed by one battery cluster management module exceeds the chargeable power limit of the battery cluster management module, and the electric quantity power demand P w is lower than the total battery management system, when each battery cluster management module receives the battery cluster management modules according to the power limiting values, the total battery management system distributes charging power to each distributed battery cluster management module, and the distributed power does not exceed the corresponding power limiting value of the battery cluster management module, and if the distributed charging power exceeds the chargeable power limit of the battery cluster management module, the distributed charging power exceeds the chargeable capacity proportion of the remaining battery cluster management module until the distribution is finished; when the charging power distributed at one of the battery cluster management modules does not exceed the chargeable power limit, the charging power is directly determined by the battery management system according to the real-time value of the power limit value and the real-time value of the SOC of each battery cluster, and the total power distributed to all the battery clusters and the power of each battery cluster are determined.
When the electric quantity power is required to be P w≤Pi2, the total battery management system distributes discharge power according to the battery cluster management modules according to the chargeable capacity proportion of each battery cluster management module, when the discharge power distributed by one battery cluster management module exceeds the dischargeable power limit of the battery cluster management module, the distributed discharge power exceeds the dischargeable power limit of the battery cluster management module, the corresponding excess power of the battery cluster management module is distributed according to the dischargeable capacity proportion of the remaining battery cluster management modules until the distribution is finished, and finally, the battery management system discharges according to the dischargeable power limit of each battery in each battery cluster management module; when the discharge power distributed in one of the battery cluster management modules does not exceed the dischargeable power limit, the battery management system directly discharges according to the dischargeable power limit of each battery in each battery cluster management module.
Energy storage intelligent battery management system-high voltage box
(III) the beneficial effects to be achieved
The invention has the beneficial effects that:
The invention has the advantages that the invention has reasonable design, simple structure and convenient installation, thereby being convenient for large-scale popularization and application;
Secondly, a total battery management system of the invention is in communication connection with each battery cluster; the energy storage converters are respectively and electrically connected with the battery clusters through the direct current branch; each battery cluster management module is used for summarizing each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit, each battery cluster management module is used for summarizing the battery management units corresponding to the batteries in each battery cluster, and each battery cluster management module is used for summarizing a total battery management system; the battery management high-voltage boxes are respectively and electrically connected with the battery clusters through the direct-current branch circuits, wherein the battery management high-voltage boxes are arranged in one-to-one correspondence with the battery clusters; a monitoring system for connecting with a total battery management system; the method is not only beneficial to realizing large-area popularization and application, but also avoids the capacity expansion through the adjustment of the interface, and can realize the capacity expansion only by adopting the change;
Secondly, the energy storage power distribution method of the invention comprises the steps of obtaining the electric quantity power requirement Pw from the external interface through the monitoring system, then carrying out charge and discharge through the total battery management system according to the chargeable and dischargeable power limit of each battery in each battery cluster management module, and simultaneously controlling the output of each cluster energy storage converter through the total battery management system according to the calculation result.
Drawings
FIG. 1 is a prior art energy storage system architecture.
Fig. 2 is a schematic diagram of a distributed energy storage power distribution system according to the present invention.
Fig. 3 is a flow chart of a distributed energy storage power distribution method according to the present invention.
In the figure: 1, a total battery management system; 2, an energy storage converter; 3, a battery cluster management module; 4, a battery management high-voltage box; 5, monitoring the system; 31, a battery management unit.
Detailed Description
In the description of the present invention, it will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships in which the inventive product is conventionally placed in use, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Referring to FIG. 2, a distributed stored energy power distribution system includes
A total battery management system 1 (a-BMS) in communication connection with each battery cluster, wherein the main functions of the battery management system 1 (BMS) include a data acquisition function, a current, a voltage, a temperature, an insulation signal acquisition and a residual electric quantity value (SOC) estimation of the battery, a real-time communication function with the system, and a balanced management, self-checking function and a system alarm and history data recording function of the battery cells according to an agreed balanced management strategy;
More than one energy storage converter 2 (PCS) is electrically connected with a plurality of battery clusters respectively through being arranged on a direct current branch, the energy storage converters 2 (PCS) are arranged on the direct current branch and are equivalent to being changed into alternating current through the energy storage converters 2 (PCS) and then are converged together, and in the prior art, the energy storage converters 2 (PCS) with high power are firstly converged on a straight bus and then are changed into alternating current through the energy storage converters 2, so that the capacity and the maximum power are inconvenient to adjust, and the cluster is increased on the straight branch and is equivalent to carrying a power output, so that the use requirement can be met;
More than one battery cluster management module 3 (C-BMS), each battery cluster management module 3 summarizing for each battery cluster, and each battery in each battery cluster is provided with a corresponding battery management unit 31 (M-BMS), each battery cluster management module 3 (C-BMS) summarizing for the corresponding battery management unit 31 (M-BMS) for the battery in each battery cluster, each battery cluster management module 3 (C-BMS) summarizing to the overall battery management system 1 (a-BMS);
Further, each of the battery cluster management modules 3 (C-BMS) is connected to the overall battery management system 1 (a-BMS) via a CAN bus and a LAN bus, which is advantageous for the transmission of suitable data. More illustratively, each of the battery cluster management modules 3 (C-BMS) is connected through a CAN bus for the battery management unit 31 (M-BMS) corresponding to the battery in each of the battery clusters.
One or more battery management high voltage boxes 4 (HMUs) are respectively and electrically connected with a plurality of battery clusters through being arranged on a direct current branch, wherein the battery management high voltage boxes 4 (HMUs) are arranged in one-to-one correspondence with the battery clusters, and the battery management high voltage boxes 4 (HMUs) can collect direct current bus voltage, branch current and charging and discharging power so as to be capable of accumulating ampere hours (ampere hours, unit of storage battery capacity, if the storage battery discharges for one hour with one ampere of current, the capacity of the storage battery is one ampere hour, one ampere hour is equal to 3600 coulomb, and the more the storage battery with larger ampere hour stores), accumulated electric quantity, insulation monitoring and the like;
A monitoring system 5 (background) for connecting the total battery management system 1 (a-BMS), wherein the monitoring system 5 (background) is connected with the total battery management system 1 (a-BMS) through a LAN bus.
As shown in fig. 3, a distributed energy storage power distribution method is applied to the distributed energy storage power distribution system, and the energy storage power distribution method includes:
The monitoring system 5 obtains the electric quantity power requirement P w from the external interface, then the total battery management system 1 can charge and discharge according to the chargeable and dischargeable power limits of the batteries in the battery cluster management modules 3, and meanwhile, the total battery management system 1 controls the output of the cluster energy storage converters 2 according to the calculation result. In the invention, a total battery management system 1 calculates the power required to be provided by each battery in each battery cluster management module 3 according to the power of the electric quantity and the residual electric quantity SOC which can be provided by each battery in each battery cluster management module 3, and dispatches an energy storage converter 2 on a direct current branch to output power; the total battery management system 1 acquires the electric quantity of the energy storage converter 2 of each distributed energy storage node, and the total battery management system 1 sends the real-time value of the power limiting value and the real-time value of the residual electric quantity SOC according to the power limiting value and the change speed of the residual electric quantity SOC. When some battery clusters cannot output power due to protection, the battery management system 1 cuts out the corresponding battery clusters and does not participate in power calculation.
Further, when the monitoring system 5 obtains the electric quantity power requirement P w from the external interface and judges whether charging is needed, if so, the total battery management system 1 obtains the sum of chargeable power limits P i1 of each battery cluster management module 3 according to the chargeable power limits of each battery in each battery cluster management module 3, and when the electric quantity power requirement P w＞Pi1, the total battery management system 1 charges each battery in each battery cluster management module 3 according to the chargeable maximum power, and the battery management system 1 charges each battery in each battery cluster management module 3 according to the chargeable power limits of each battery; when the battery is not required to be charged, the total battery management system 1 obtains the sum of the dischargeable power limits P i2 of the battery cluster management modules 3 according to the dischargeable power limits of the batteries in the battery cluster management modules 3, and when the electric quantity power is required to be P w＞Pi2, the total battery management system 1 discharges according to the dischargeable maximum power of the batteries in the battery cluster management modules 3, and the battery management system 1 discharges according to the dischargeable power limits of the batteries in the battery cluster management modules 3.
Further, when the power demand P w≤Pi1 is met, the total battery management system 1 receives the real value and the SOC real value of the power limit value sent by each battery cluster management module 3 according to the power limit value and the SOC change speed, the total battery management system 1 distributes the charging power according to the chargeable capacity ratio of each battery cluster management module 3, when the charging power distributed by one of the battery cluster management modules 3 exceeds the chargeable power limit thereof and the power demand P w is lower than the power demand P w, the total battery management system 1 distributes the charging power to each distributed battery cluster management module 3 when the total battery management system 1 receives the power of each battery cluster management module 3 according to the power limit value, and the distributed power does not exceed the power limit value of the corresponding battery cluster management module 3, and if the distributed charging power exceeds the chargeable power limit value, the corresponding battery cluster management module 3 exceeds the power, the chargeable capacity ratio of the remaining battery cluster management module 3 is distributed until the distribution is completed; when the charging power allocated to a certain battery cluster management module 3 does not exceed the chargeable power limit, the charging power is directly determined by the battery management system 1 according to the real-time value of the power limit value of each battery cluster and the real-time value of the SOC to determine the total power allocated to all the battery clusters and the power of each battery cluster.
Further, when the power demand P w≤Pi2 is met, the total battery management system 1 allocates the discharge power according to the battery cluster management modules 3, the total battery management system 1 allocates the discharge power according to the chargeable capacity ratio of each battery cluster management module 3, when the discharge power allocated by one of the battery cluster management modules 3 exceeds the dischargeable power limit, the allocated discharge power exceeds the dischargeable power limit corresponding to the excessive power on the battery cluster management module 3, and then allocates the excessive power according to the dischargeable capacity ratio of the remaining battery cluster management modules 3 until the allocation is completed, and finally, the battery management system 1 performs discharging according to the dischargeable power limit of each battery in each battery cluster management module 3; when the discharge power distributed in one of the battery cluster management modules 3 does not exceed the dischargeable power limit, the battery management system 1 directly performs discharging according to the dischargeable power limit of each battery in each battery cluster management module 3.
The invention is beneficial to saving the cost of an Energy Management System (EMS), and the battery stack management unit receives the function of partial EMS in the secondary mode, so that the cost of building the EMS system by a user can be saved; active equalization among the battery clusters is realized, active equalization of capacity among the battery clusters can be realized through power scheduling of the distributed energy storage converter, and the equalization of the capacity of each battery cluster is maintained in the running process; the system is more flexible to configure, and the capacity and the power of the whole energy storage system can be increased or decreased by increasing or decreasing the number of the battery clusters, so that the energy storage system can be conveniently upgraded or used in schemes with different requirements. In a word, the invention is convenient for the combination adjustment of capacity and power, and is more beneficial to meeting the use requirement.
The components such as the battery management high-voltage box and the monitoring system used in the document of the application are all of the conventional type in the prior art, the internal construction of the battery management high-voltage box and the monitoring system belongs to the prior art structure, and a worker can complete normal operation of the battery management high-voltage box and the monitoring system according to the prior art manual, and the circuit connection adopts the conventional connection mode in the prior art, so that a specific description is not made.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solutions directly or indirectly to other relevant technical fields, all of which are included in the scope of protection of the present patent.
Claims (5)
1. A distributed stored energy power distribution method, characterized by being applied to a distributed stored energy power distribution system, the distributed stored energy power distribution system comprising:
a total battery management system (1) which is in communication connection with each battery cluster;
The energy storage converters (2) are arranged on the direct current branch and are respectively and electrically connected with the battery clusters;
Each battery cluster management module (3) is used for summarizing each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit (31), each battery cluster management module (3) is used for summarizing the battery management units (31) of each battery, and each battery cluster management module (3) is summarized to the total battery management system (1);
The battery management high-voltage boxes (4) are arranged on the direct current branch and are respectively and electrically connected with the battery clusters, and the battery management high-voltage boxes (4) are arranged in one-to-one correspondence with the battery clusters;
-a monitoring system (5) for connecting to said total battery management system (1);
the method comprises the following steps: acquiring an electric quantity power demand P w from an external interface through the monitoring system (5), then charging and discharging through the total battery management system (1) according to the charging and discharging power limits of each battery in each battery cluster management module (3), and controlling the output of each energy storage converter (2) of each cluster through the total battery management system (1) according to an energy storage power distribution calculation result;
The monitoring system (5) judges whether charging is needed, if so, the total battery management system (1) obtains the sum P i1 of chargeable power limits of the battery cluster management modules (3) according to the chargeable power limits of the batteries in the battery cluster management modules (3), and when the electric quantity power is required P w＞Pi1, the total battery management system (1) charges according to the chargeable maximum power or chargeable power limits of the batteries in the battery cluster management modules (3); if no charging is needed, the total battery management system (1) obtains the sum P i2 of the dischargeable power limits of the battery cluster management modules (3) according to the dischargeable power limits of the batteries in the battery cluster management modules (3), and when the electric quantity power is required to be P w＞Pi2, the total battery management system (1) discharges according to the dischargeable maximum power or dischargeable power limits of the batteries in the battery cluster management modules (3).
2. A distributed stored energy power distribution method according to claim 1, wherein: when the electric quantity power demand P w≤Pi1 is met, the total battery management system (1) receives a real-time value and an SOC real-time value of a power limit value sent by each battery cluster management module (3), the total battery management system (1) distributes charging power according to the chargeable capacity proportion of each battery cluster management module (3), when certain distributed charging power of each battery cluster management module (3) exceeds the chargeable capacity limit of the battery cluster management module, and the electric quantity power demand P w is lower than the power limit value of each battery cluster management module (3) received by the total battery management system (1), the total battery management system (1) distributes charging power to the power of each distributed battery cluster management module (3), the distributed power does not exceed the power limit value of the corresponding battery cluster management module (3), and if the distributed charging power exceeds the chargeable capacity limit of the battery cluster, the corresponding battery cluster management module (3) distributes the exceeding power according to the chargeable capacity proportion of the remaining battery cluster management module (3) until the distribution is finished; when the charging power distributed at one of the battery cluster management modules (3) does not exceed the chargeable power limit, the charging power is directly used for determining the total power distributed to all the battery clusters and the power of each battery cluster through the battery management system (1) according to the real-time value of the power limit value and the real-time value of the SOC of each battery cluster.
3. A distributed stored energy power distribution method according to claim 1, wherein: when the electric quantity power is required to be P w≤Pi2, the total battery management system (1) distributes discharge power according to the chargeable capacity proportion of each battery cluster management module (3), when the discharge power distributed by one battery cluster management module (3) exceeds the dischargeable power limit of the battery cluster management module, the corresponding battery cluster management module (3) distributes the excess power according to the dischargeable capacity proportion of the remaining battery cluster management modules (3) until the distribution is ended, and finally, the battery management system (1) discharges according to the dischargeable power limit of each battery in each battery cluster management module (3); when the discharge power distributed in one of the battery cluster management modules (3) does not exceed the dischargeable power limit, the battery management system (1) directly discharges according to the dischargeable power limit of each battery in each battery cluster management module (3).
4. A distributed stored energy power distribution system that, when run, performs the method of claim 1, characterized by: each battery cluster management module (3) is connected with the total battery management system (1) through a CAN bus and a LAN bus.
5. A distributed stored energy power distribution system according to claim 4 wherein: the monitoring system (5) is connected with the total battery management system (1) through a LAN bus.
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| CN116231795B (en) * | 2023-02-11 | 2023-12-22 | 珠海康晋电气股份有限公司 | Comprehensive management control system for distributed storage battery |
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