CN114050621A - Distributed energy storage power distribution system and method - Google Patents
Distributed energy storage power distribution system and method Download PDFInfo
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- CN114050621A CN114050621A CN202111280534.0A CN202111280534A CN114050621A CN 114050621 A CN114050621 A CN 114050621A CN 202111280534 A CN202111280534 A CN 202111280534A CN 114050621 A CN114050621 A CN 114050621A
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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
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 more than one energy storage converters are respectively and electrically connected with the plurality of battery clusters through the direct current branch; the battery management system comprises more than one battery cluster management module, each battery cluster management module summarizes each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit, each battery cluster management module summarizes the battery management units corresponding to the batteries in each battery cluster, and each battery cluster management module summarizes the battery management units corresponding to the batteries in each battery cluster to a total battery management system; the battery management high-voltage boxes are electrically connected with the plurality of battery clusters through the direct current branch, and the battery management high-voltage boxes are arranged in one-to-one correspondence with the battery clusters; and the monitoring system is used for connecting the overall battery management system. The invention is not only beneficial to realizing large-area popularization and application, but also avoids expanding the capacity by 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 vehicles, the research and application of energy storage technology are more and more emphasized by all countries in the world, and the demands of industrial and commercial industries on higher power supply reliability, and the micro-grid technology is rapidly developed. The renewable energy is greatly influenced by meteorological environment and has the defect of intermittent work, and the energy storage system is used as an energy storage system, so that the temporal or local difference between energy supply and demand of new energy power generation is overcome, and the renewable energy is an important component of the microgrid. The distributed energy storage system has a wide application prospect, relates to each link in a power distribution system, can effectively improve the operation reliability of the system, improve the electric energy quality of the system, improve the intervention capability of renewable energy sources of a power distribution network, increase the economic benefits of a power grid and users and provide powerful support for the development of an intelligent power distribution network, and the application of the distributed energy storage system can be realized by fully playing the role of distributed energy storage equipment. Compared with a large-scale and centralized energy storage system, the distributed energy storage system has less limitation on the environment and natural conditions of the access position, has more flexible mode of accessing the power grid, and can play a unique role on the side of a power distribution network, a micro-grid, a distributed power supply and a user side. For example, patent application publication No. CN109842138A discloses a power distribution method for a distributed energy storage system and a system controller thereof, the method includes: 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 each battery cluster energy storage node, which are sent according to the power limit value and the change speed of the SOC; a system controller receives a target demand value of client power transmitted 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 SOC real-time value; 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 power distribution is carried out according to the change speed of the parameters, so that 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 a battery state and protecting the operation of a lithium battery, the battery management system (energy storage BMS system) generally consists 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 top level management unit of the whole battery management system (energy storage BMS system), is an external window of the whole energy storage system, and has the realization requirement of more functions. As shown in fig. 1, energy scheduling of the existing distributed energy storage system is generally performed by linking an external energy storage converter (PCS) to a bus, and a previous Energy Management System (EMS) is required to set and clear power of the energy storage converter (PCS), which has the following disadvantages:
firstly, compared with a centralized energy storage system, the distributed energy storage system has smaller capacity and simpler application scene, and under the condition, a user still needs a set of Energy Management System (EMS) to control the operation of the whole alternating current and direct current system, which undoubtedly increases the cost of construction and maintenance;
secondly, a battery management system (energy storage BMS system) and an 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 battery voltage and internal resistance, so that the active equalization among clusters can not be realized through the power scheduling among clusters;
thirdly, in the prior art, an energy storage system usually uses an energy storage converter (PCS) with fixed capacity and fixed power, and a battery management system (energy storage BMS system) generally only manages a battery at a direct current side and cannot participate in the operation of an Energy Management System (EMS), and under the condition, capacity expansion or capacity reduction usually needs to replace the energy storage converter (PCS) or change the Energy Management System (EMS), so that the cost input is greatly increased.
Disclosure of Invention
Technical problem to be solved
Aiming at 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 for combining and adjusting capacity and power and are more beneficial to meeting use requirements.
(II) technical scheme to be adopted
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a distributed energy storage power distribution system includes
A master battery management system communicatively coupled to each of the battery clusters;
the more than one energy storage current transformer is respectively and electrically connected with the plurality of battery clusters through the direct current branch;
the battery management system comprises more than one battery cluster management module, each battery cluster management module summarizes each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit, each battery cluster management module summarizes the battery management units corresponding to the batteries in each battery cluster, and each battery cluster management module summarizes the battery management units to the total battery management system;
the battery management high-voltage boxes are respectively and electrically connected with the plurality of battery clusters through the direct current branch, and the battery management high-voltage boxes are arranged in one-to-one correspondence with the battery clusters;
and the monitoring system is connected with the total battery management system.
Preferably, each battery cluster management module is connected with the total battery management system through a CAN bus and a LAN bus.
Preferably, each of the battery cluster management modules is connected to a corresponding battery management unit corresponding to a battery in each battery cluster through a CAN bus.
Preferably, the monitoring system and the total battery management system are connected through 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 comprises the step of acquiring the electric quantity power demand P from an external interface through the monitoring systemwAnd then, charging and discharging can be carried out through the total battery management system according to the chargeable and dischargeable power limit of each battery in each battery cluster management module, and meanwhile, the total battery management system controls the output of each cluster of energy storage converters according to the calculation result.
Acquiring the electric quantity power demand P from an external interface through the monitoring systemwIf the total battery management system needs to be charged, the total battery management system obtains the chargeable power limit sum P of each battery cluster management module according to the chargeable power limit of each battery in each battery cluster management modulei1At the power demand P of the electric quantityw＞Pi1When the total battery management system is used, the total battery management system charges according to the chargeable power limit of each battery in each battery cluster management module; when the charging is not needed, the total battery management system obtains the sum P 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 modulesi2At the power demand P of the electric quantityw＞Pi2And then, the total battery management system discharges according to the chargeable maximum power of each battery in each battery cluster management module, and the battery management system discharges according to the dischargeable power limit of each battery in each battery cluster management module.
At the electricity quantity power demand Pw≤Pi1Then, the total battery management system receives the power sent by the battery cluster management module according to the power limiting value and the change speed of the SOC according to the battery cluster management modules of each battery clusterThe total battery management system distributes charging power according to the chargeable capacity proportion of each battery cluster management module, the charging power distributed to one of the battery cluster management modules exceeds the chargeable power limit, and the electric quantity power demand PwWhen the total battery management system receives the power limiting value of each battery cluster management module according to the power of each battery cluster, the total battery management system distributes charging power to each distributed battery cluster management module, the distributed power does not exceed the power limiting value of the corresponding battery cluster management module, and if the distributed charging power exceeds the chargeable power limit corresponding to the exceeding power of the battery cluster management module, the distributed charging power is distributed according to the chargeable capacity proportion of the rest battery cluster management modules until the distribution end position; when the charging power distributed by one of the battery cluster management modules does not exceed the chargeable power limit, the charging power directly determines the total power distributed to all the battery clusters and the power of each battery cluster through the battery management system according to the real-time value and the SOC real-time value of the power limit value of each battery cluster.
At the electricity quantity power demand Pw≤Pi2When the total battery management system is used, the total battery management system distributes discharge power according to the chargeable capacity proportion of each battery cluster management module according to each battery cluster management module, when the discharge power distributed by one battery cluster management module exceeds the dischargeable power limit, the distributed discharge power exceeds the dischargeable power limit and corresponds to the exceeding power on the battery cluster management module, then the exceeding power is distributed according to the dischargeable capacity proportion of the rest battery cluster management modules until the distribution is finished, and finally the discharge is carried out through the battery management system according to the dischargeable power limit of each battery in each battery cluster management module; when the discharge power distributed by one of the battery cluster management modules does not exceed the dischargeable power limit, the battery management system discharges directly 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 relates to a battery management system, a battery management module, a battery management high-voltage box and a monitoring system, which are characterized by reasonable design, simple structure and convenient installation, thus facilitating large-scale popularization and application;
secondly, the invention provides a total battery management system which is in communication connection with each battery cluster; the more than one energy storage current transformer is respectively and electrically connected with the plurality of battery clusters through the direct current branch; the battery management system comprises more than one battery cluster management module, each battery cluster management module summarizes each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit, each battery cluster management module summarizes the battery management units corresponding to the batteries in each battery cluster, and each battery cluster management module summarizes the battery management units corresponding to the batteries in each battery cluster to a total battery management system; the battery management high-voltage boxes are respectively and electrically connected with the plurality of battery clusters through the direct current branch, and the battery management high-voltage boxes are arranged in one-to-one correspondence with the battery clusters; the monitoring system is connected with a total battery management system; the method is not only beneficial to realizing large-area popularization and application, but also avoids expanding the capacity by adjusting the interface, and can realize the capacity expansion only by adopting change;
secondly, the energy storage power distribution method comprises the steps that the monitoring system obtains the electric quantity power demand Pw from the external interface, then the total battery management system can carry out charging and discharging according to the limit of the chargeable and dischargeable power of each battery in each battery cluster management module, and simultaneously the total battery management system controls the output of each cluster of energy storage converters according to the calculation result.
Drawings
Fig. 1 is a diagram of 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 schematic 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 should be noted that when an element is referred to as being "fixed" or "disposed" to 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships in which the products of the present invention are conventionally placed when used, and are merely used for convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to FIG. 2, a distributed energy storage power distribution system includes
A total battery management system 1(A-BMS) which is connected with each battery cluster in a communication way, wherein the main functions of the battery management system 1(BMS) comprise a data acquisition function, a real-time communication function with the system, a function of carrying out balance management and self-checking on the battery cell according to a agreed balance management strategy, and a function of system alarming and historical data recording, and the current, voltage, temperature and insulation signal acquisition of the battery cluster and the estimation of the residual electric quantity value (SOC) of the battery are completed;
more than one energy storage converter 2(PCS), which is respectively electrically connected with a plurality of battery clusters through being arranged on a direct current branch, wherein the energy storage converter 2(PCS) arranged on the direct current branch is equivalent to be changed into alternating current through the energy storage converter 2(PCS) and then converged together, and for the prior art, the energy storage converter 2(PCS) with high power is used by converging firstly and then changed into alternating current through the energy storage converter 2 on a linear bus, so that the capacity and the maximum power are not convenient to adjust, and the requirement on use can be met by adding one cluster on the linear branch, which is equivalent to carrying one power output by itself;
more than one battery cluster management module 3(C-BMS), wherein each battery cluster management module 3 summarizes each battery cluster, 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) summarizes the battery management units 31(M-BMS) corresponding to the batteries in each battery cluster, and each battery cluster management module 3(C-BMS) summarizes the total battery management system 1 (A-BMS);
further, each battery cluster management module 3(C-BMS) is connected to the overall battery management system 1(a-BMS) through the CAN bus and the LAN bus, facilitating transmission of appropriate data. It is further noted that each battery cluster management module 3(C-BMS) is connected to the corresponding battery management unit 31(M-BMS) for the battery in each battery cluster through a CAN bus.
More than one battery management high-voltage box 4(HMU) which is arranged on the direct current branch and is respectively and electrically connected with the plurality of battery clusters, wherein the battery management high-voltage boxes 4(HMU) are arranged in one-to-one correspondence with the battery clusters, and the battery management high-voltage box 4(HMU) can collect direct current bus voltage, branch current and charge-discharge power, so that the integrated ampere hour (ampere hour, unit of the capacity of the storage battery, if the storage battery discharges for one hour by one ampere of current, the capacity of the storage battery is one ampere hour, one ampere hour is equal to 3600 coulomb, the more the ampere hour, the more the storage battery stores more electric quantity, the integrated electric quantity, insulation monitoring and the like can be carried out;
and the monitoring system 5 (background) is connected with the total battery management system 1(A-BMS), and 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:
acquiring electric quantity power demand P from external interface through monitoring system 5wThen, the total battery management system 1 can charge and discharge according to the chargeable and dischargeable power limit of each battery in each battery cluster management module 3, and meanwhile, the total battery management system 1 controls the output of each cluster energy storage converter 2 according to the calculation result. In the present invention, the total battery management system 1 manages the available electric power and remaining capacity of each battery in the module 3 according to each battery clusterThe electric quantity SOC calculates the power required to be provided by each electricity in each battery cluster management module 3, and an energy storage converter 2 on the direct current branch is scheduled to output the 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 limit value and the real-time value of the residual electric quantity SOC according to the change speed of the power limit value and 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.
Furthermore, the monitoring system 5 obtains the power demand P of the electric quantity from the external interfacewIf it is determined whether charging is required, the total battery management system 1 obtains the sum P of the 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 3i1At the power demand P of the electric quantityw＞Pi1Then, the total battery management system 1 charges according to the chargeable power of each battery in each battery cluster management module 3, and the battery management system 1 charges according to the chargeable power limit of each battery in each battery cluster management module 3; when it does not need to be charged, the total battery management system 1 obtains the sum P 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 3i2At the power demand P of the electric quantityw＞Pi2In the meantime, the total battery management system 1 discharges according to the chargeable power of each battery in each battery cluster management module 3, and the battery management system 1 discharges according to the dischargeable power limit of each battery in each battery cluster management module 3.
Furthermore, at the electric quantity power demand Pw≤Pi1Then, the total battery management system 1 receives the real-time value and SOC real-time value of the power limit value sent by each battery cluster management module 3 according to the power limit value and the change speed of SOC according to each battery cluster management module 3, the total battery management system 1 allocates charging power according to the chargeable capacity proportion of each battery cluster management module 3, the charging power allocated to one of the battery cluster management modules 3 exceeds the chargeable power limit, andpower demand of electricitywWhen the total battery management system 1 receives the power limiting value of each battery cluster management module 3, the total battery management system 1 distributes charging power to each distributed battery cluster management module 3, the distributed power does not exceed the power limiting value of the corresponding battery cluster management module 3, and if the distributed charging power exceeds the chargeable power limit of the corresponding battery cluster management module 3, the distributed charging power is distributed according to the chargeable capacity proportion of the remaining battery cluster management modules 3 until the distribution end position; when the charge power allocated at one of the battery cluster management modules 3 does not exceed its chargeable power limit, the charge power is directly determined by the battery management system 1 according to the real-time value and the SOC real-time value of the power limit value of each battery cluster to the total power allocated to all the battery clusters and the power of each battery cluster.
Furthermore, at the electric quantity power demand Pw≤Pi2When the total battery management system 1 is used, according to each battery cluster management module 3, 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 of the battery cluster management modules 3 exceeds the dischargeable power limit, the distributed discharge power exceeds the dischargeable power limit and corresponds to the overdischarge power of the battery cluster management module 3, then the overdischarge power is distributed according to the dischargeable capacity proportion of the rest battery cluster management modules 3 until the distribution end position, and finally the discharge is carried out through the battery management system 1 according to the dischargeable power limit of each battery in each battery cluster management module 3; when the discharge power allocated to one of the battery cluster management modules 3 does not exceed the dischargeable power limit, the battery management system 1 discharges the battery directly 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 bears partial functions of the EMS in the secondary mode, thereby saving the cost for a user to set up the EMS system; active equalization among the battery clusters is realized, active equalization of the 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 kept in the operation process; more nimble configuration through the quantity that increases and decreases the battery cluster, can increase and decrease whole energy storage system's capacity and power, is convenient for upgrade one set of energy storage system, perhaps uses one set of system in the scheme of different demands. In a word, the invention facilitates the combination and adjustment of capacity and power, and is more favorable for meeting the use requirement.
The components such as the battery management high-voltage box, the monitoring system and the like used in the application document are all of conventional models in the prior art, the internal structure of the components belongs to the prior art structure, a worker can complete normal operation of the components according to a prior art manual, and the circuit connection adopts a conventional connection mode in the prior art, so that detailed description is not given.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present patent.
Claims (7)
1. A distributed energy storage power distribution system includes
A total battery management system (1) which is connected with each battery cluster in a communication way;
more than one energy storage converter (2) which is respectively and electrically connected with the plurality of battery clusters through the energy storage converters arranged on the direct current branch;
more than one battery cluster management module (3), wherein each battery cluster management module (3) summarizes each battery cluster, each battery in each battery cluster is provided with a corresponding battery management unit (31), each battery cluster management module (3) summarizes the battery management units (31) corresponding to the batteries in each battery cluster, and each battery cluster management module (3) summarizes the total battery management system (1);
the battery management high-voltage boxes (4) are respectively and electrically connected with the plurality of battery clusters through the direct current branch, wherein the battery management high-voltage boxes (4) are arranged in one-to-one correspondence with the battery clusters;
a monitoring system (5) for connection with the overall battery management system (1).
2. The distributed energy storage power distribution system of claim 1, wherein: each battery cluster management module (3) is connected with the total battery management system (1) through a CAN bus and a LAN bus.
3. The distributed energy storage power distribution system of claim 1, wherein: the monitoring system (5) is connected with the total battery management system (1) through a LAN bus.
4. A distributed energy storage power distribution method applied to the distributed energy storage power distribution system of any one of claims to 3, the energy storage power distribution method comprising obtaining, by the monitoring system (5), an electric quantity power demand P from an external interfacewAnd then, the total battery management system (1) can charge and discharge according to the chargeable and dischargeable power limit of each battery in each battery cluster management module (3), and meanwhile, the total battery management system (1) controls the output of each cluster of energy storage converters (2) according to the calculation result.
5. The distributed energy storage power distribution method of claim 4, wherein: the monitoring system (5) obtains the electric quantity power demand P from an external interfacewIf the charging is needed, the total battery management system (1) obtains the sum P of the 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)i1At the power demand P of the electric quantityw＞Pi1The total battery management system (1) is charged according to the chargeable maximum power of each battery in each battery cluster management module (3), and the battery management system (1) is charged according to each battery cluster management module(3) Charging each battery by the chargeable power limit; when the charging is not needed, the total battery management system (1) obtains the sum P 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)i2At the power demand P of the electric quantityw＞Pi2When the system is used, the total battery management system (1) discharges according to the chargeable maximum power of each battery in each battery cluster management module (3), and the battery management system (1) discharges according to the dischargeable power limit of each battery in each battery cluster management module (3).
6. The distributed energy storage power distribution method of claim 5, wherein: at the electricity quantity power demand Pw≤Pi1When the system is used, the total battery management system (1) receives a real-time value and an SOC real-time value of a power limit value sent by the battery cluster management module (3) according to the power limit value and the change speed of SOC according to the battery cluster management modules (3) of each battery cluster, the total battery management system (1) distributes charging power according to the chargeable capacity proportion of the battery cluster management modules (3), the charged power distributed by one battery cluster management module (3) exceeds the chargeable power limit, and the electric quantity power demand P is metwWhen the total battery management system (1) receives the power limit value of each battery cluster and the battery cluster management module (3), the total battery management system (1) distributes charging power to 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 power limit value of the corresponding battery cluster management module (3), the distributed charging power is distributed according to the chargeable capacity proportion of the rest battery cluster management modules (3) until the distribution end position; when the charging power allocated at one of the battery cluster management modules (3) does not exceed its chargeable power limit, the charging power is determined and allocated to all the battery clusters directly by the battery management system (1) according to the real-time value and the SOC real-time value of the power limit value of each battery clusterThe total power of the battery clusters and the power of each battery cluster.
7. The distributed energy storage power distribution method of claim 5, wherein: at the electricity quantity power demand Pw≤Pi2When the discharge power distributed by one of the battery cluster management modules (3) exceeds the dischargeable power limit, the distributed discharge power exceeds the dischargeable power limit corresponding to the excess power on the battery cluster management module (3), and then the distributed discharge power is distributed according to the dischargeable capacity limit of the rest of the battery cluster management modules (3) until the distribution end position, and finally the discharge is performed through the battery management system (1) according to the dischargeable power limit of each battery in each battery cluster management module (3); when the discharge power distributed by one of the battery cluster management modules (3) does not exceed the dischargeable power limit, the battery management system (1) discharges the discharge power directly according to the dischargeable power limit of each battery in each battery cluster management module (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116231795A (en) * | 2023-02-11 | 2023-06-06 | 珠海康晋电气股份有限公司 | Comprehensive management control system for distributed storage battery |
| CN116799844A (en) * | 2023-08-28 | 2023-09-22 | 深圳市健网科技有限公司 | Portable distributed energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116231795A (en) * | 2023-02-11 | 2023-06-06 | 珠海康晋电气股份有限公司 | Comprehensive management control system for distributed storage battery |
| 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 |
| CN116799844A (en) * | 2023-08-28 | 2023-09-22 | 深圳市健网科技有限公司 | Portable distributed energy storage system |
| CN116799844B (en) * | 2023-08-28 | 2023-12-05 | 深圳市健网科技有限公司 | Portable distributed energy storage system |
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