CN114977381A - Energy storage system control circuit with multiple parallel battery clusters and control method thereof - Google Patents
Energy storage system control circuit with multiple parallel battery clusters and control method thereof Download PDFInfo
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- 238000012983 electrochemical energy storage Methods 0.000 description 5
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- 238000011161 development Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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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- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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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Abstract
The application discloses many parallelly connected energy storage system control circuit of battery cluster and control method thereof, wherein, energy storage battery cluster parallel control circuit includes: n energy storage battery clusters, wherein N is a positive integer; the energy storage battery cluster management modules correspond to the energy storage battery clusters one by one, and the energy storage battery cluster management modules are used for acquiring state information of the corresponding energy storage battery clusters; the system management controller is used for sending out control signals according to the status information of the N energy storage battery clusters, so that the battery cluster management module controls the corresponding energy storage battery clusters; and a DC-DC converter for performing a charging/discharging operation according to the control signal. The circuit can realize mutual energy supplement among energy storage battery clusters in the energy storage system in an energy transfer mode, finally achieve state consistency, prevent high surge circulation impact among the parallel battery clusters, and ensure the safety and reliability of parallel connection of a plurality of battery clusters.
Description
Technical Field
The application belongs to the technical field of power system control, and particularly relates to an energy storage system control circuit with multiple parallel battery clusters and a control method thereof.
Background
The energy storage is an important supporting technology of a smart grid and a renewable energy high-ratio energy system. The method is an important component of strategic emerging industries in China, and in recent years, accelerating of relevant encouragement policies paves the way for the mass development of the energy storage industry, and pushes the industry to enter the large-scale development stage.
Energy storage relates to a wide field, and can be divided into physical energy storage and electrochemical energy storage in the broad category. The electrochemical energy storage is a general term of battery energy storage, the electrochemical energy storage technology is a key development direction at present, and the lithium ion battery is the center of gravity of the electrochemical energy storage technology.
The technology of the energy storage industry is in a rapid development stage, and a series of problems also occur in the process. There is no energy storage technology that can form an absolute advantage.
Generally, an electrochemical energy storage system is provided with a plurality of parallel branches. The inconsistencies from branch to branch can create surge ring currents. If the circulation current exceeds the charge/discharge rate tolerance of the battery, irreversible damage can be caused to the battery body, so that the charge/discharge performance, the service life and the safety of the battery are influenced; meanwhile, too high surge impact circulation can also cause overload during the action of a high-voltage switch in the energy storage electrical system so as to cause premature failure, and the reliability of the electrical system is reduced.
The general methods for solving or inhibiting surge impact circulation have certain technical limitations and engineering realization limitations such as direct closing switch merging based on voltage judgment, one-way diode isolation merging, single energy storage battery cluster increased DC isolation, merging after pre-charging resistance buffering and the like. If the direct closing switch merging method based on voltage judgment is adopted, automatic merging under the condition of large differential pressure cannot be realized, and forced merging has great damage and safety risk to the battery; the adoption of the diode and DC isolation scheme can realize direct integration, but when the energy storage system discharges at high power, the cost of the diode, the DC and the additional electric appliance is very high, which is not beneficial to industrialized application; the pre-charging resistor buffering scheme cannot rapidly obtain the merging condition of voltage consistency, if the consistent voltage is rapidly obtained, the model selection power is huge, too much energy of a battery can be consumed, the energy waste of a system is caused, and the engineering realization is not advisable.
Disclosure of Invention
Objects of the invention
The invention aims to provide a control circuit and a control method for an energy storage system with multiple parallel battery clusters to solve the problem of high surge impact circulation caused by inconsistent voltage when a system is incorporated into an application of the multi-branch parallel energy storage battery cluster.
(II) technical scheme
According to a first aspect of embodiments of the present application, there is provided a control circuit for a multi-energy storage battery cluster parallel energy storage system, where the control circuit may include:
the energy storage system comprises N energy storage battery clusters, wherein N is a positive integer;
the energy storage battery cluster management modules correspond to the energy storage battery clusters one by one, and are used for acquiring state information of the corresponding energy storage battery clusters and managing the corresponding battery clusters according to the acquired information and preset control logic;
the system management controller is used for sending out a control signal according to the status information of the gathered N energy storage battery clusters so that the energy storage battery cluster management module controls the corresponding energy storage battery cluster;
and a DC-DC converter for performing a charging/discharging operation according to the control signal.
In some optional embodiments of the present application, the energy storage system of the energy storage battery cluster includes:
a management module of the energy storage battery cluster;
a positive discharge switch;
the positive charging switch is connected with the positive discharging switch in parallel, and the positive charging switch and the positive discharging switch are both arranged at the positive electrode of the corresponding energy storage battery cluster;
the negative electrode switch is arranged at the negative electrode of the corresponding energy storage battery cluster;
and the management module of the energy storage battery cluster is used for acquiring the state information of the energy storage battery cluster corresponding to the management module and executing the opening/closing actions of the positive electrode discharging switch, the positive electrode charging switch and the negative electrode switch according to the preset control logic.
In some optional embodiments of the present application, the energy storage system of the energy storage battery cluster further includes: a fuse;
the fuse is arranged between the corresponding energy storage battery cluster and the positive electrode discharge switch.
In some optional embodiments of the present application, the energy storage battery clusters in the N energy storage battery clusters are arranged in parallel with each other.
In some optional embodiments of the present application, the total positive of the energy storage battery clusters arranged in parallel is connected with the positive input end of the DC-DC converter;
and the total negative end of the energy storage battery cluster arranged in parallel is connected with the negative electrode input end of the DC-DC converter.
In some optional embodiments of the present application, further comprising: a communication module:
the communication module is used for data interaction among the system management controller, the energy storage battery cluster management module and the DC-DC converter.
In some optional embodiments of the present application, the state information comprises voltage information, current information, temperature information, SOC information.
In some optional embodiments of the present application, the DC-DC converter is of a bidirectional conversion type.
According to a second aspect of embodiments of the present application, there is provided a multiple energy storage battery cluster parallel energy storage system, which may include: the energy storage battery cluster of any embodiment of the first aspect incorporates a control circuit and an electrical load.
According to a third aspect of the embodiments of the present application, there is provided a parallel control method for multiple energy storage battery clusters, where the method may include:
collecting voltage information of all energy storage battery clusters;
comparing the voltage among the energy storage battery clusters and sequencing;
closing a positive discharge switch and a negative discharge switch corresponding to the energy storage battery cluster with the highest voltage;
sequentially judging the total pressure of the second highest voltage battery cluster and the total pressure of the energy storage battery clusters which are merged into the energy storage battery clusters;
if the voltage difference of all the battery clusters is judged to be in the range capable of being safely and directly merged, all the anode discharge switches and all the cathode discharge switches are directly closed, and the DC-DC converter is not started to work;
if the voltage of the energy storage battery cluster and the total voltage difference of the energy storage battery cluster which is already merged in are higher than the allowable range, firstly closing a positive electrode charging switch and a negative electrode switch which correspond to the energy storage battery cluster, enabling the energy DC-DC converter to output appropriate charging parameters to rapidly charge the energy storage battery cluster until the allowable merging voltage range is reached, then disconnecting the positive electrode charging switch, and closing the positive electrode discharging switch.
(III) advantageous effects
The technical scheme of the application has the following beneficial technical effects:
the circuit of the embodiment of the application can realize mutual supplement of energy among the energy storage battery clusters in the energy storage system in an energy transfer mode and finally achieve state consistency, and ensures the safety and reliability of merging of multiple battery clusters; the adopted DC-DC converter has high efficiency and small energy loss; and the control circuit has a simple structure, is easier to realize in engineering compared with the common technical scheme, and the whole energy storage system is only provided with one DC-DC converter and a related control circuit switch.
Drawings
Fig. 1 is a schematic diagram of a control circuit structure of an energy storage system with multiple energy storage battery clusters connected in parallel according to an exemplary embodiment of the present application;
FIG. 2 is a flowchart of a method for controlling an energy storage system with multiple energy storage battery clusters connected in parallel according to an exemplary embodiment of the present disclosure;
fig. 3 is a flowchart of a method for controlling an energy storage system with multiple energy storage battery clusters connected in parallel according to an embodiment of the present disclosure;
fig. 4 is a flowchart of the control of the efficient discharge of the DC-DC converter in reverse operation in an exemplary embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with the detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present application. 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 application.
In the drawings, a schematic diagram of a layer structure according to an embodiment of the application is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. 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.
In the description of the present application, it is noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
The energy storage battery cluster incorporation control circuit and the energy storage battery cluster incorporation control method provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
As shown in fig. 1, in a first aspect of the embodiments of the present application, there is provided an energy storage system control circuit with multiple energy storage battery clusters connected in parallel, where the circuit may include:
the energy storage system comprises N energy storage battery clusters, wherein N is a positive integer;
the energy storage battery cluster management modules correspond to the energy storage battery clusters one by one, and are used for acquiring state information of the corresponding energy storage battery clusters and managing the corresponding battery clusters according to the acquired information and preset control logic;
the system management controller is used for sending out a control signal according to the status information of the gathered N energy storage battery clusters so that the energy storage battery cluster management module controls the corresponding energy storage battery cluster;
and a DC-DC converter for performing a charging/discharging operation according to the control signal.
The circuit in the embodiment can realize mutual supplement of energy among energy storage battery clusters in the energy storage system in an energy transfer mode to finally achieve state consistency, and ensures the safety and reliability of merging of multiple battery clusters; the adopted DC-DC converter has high efficiency and small energy loss; and the control circuit has a simple structure, is easier to realize in engineering compared with the common technical scheme, and the whole energy storage system is only provided with one DC-DC converter and a related control circuit switch.
In some optional embodiments of the present application, the energy storage system of the energy storage battery cluster comprises:
a management module of the energy storage battery cluster;
a positive discharge switch;
the positive charging switch is connected with the positive discharging switch in parallel, and the positive charging switch and the positive discharging switch are both arranged at the positive electrode of the corresponding energy storage battery cluster;
the negative electrode switch is arranged at the negative electrode of the corresponding energy storage battery cluster;
and the management module of the energy storage battery cluster is used for acquiring the state information of the energy storage battery cluster corresponding to the management module and executing the opening/closing actions of the positive electrode discharging switch, the positive electrode charging switch and the negative electrode switch according to the preset control logic.
In some optional embodiments of the present application, the energy storage system of the energy storage battery cluster further includes: a fuse;
the fuse is arranged between the corresponding energy storage battery cluster and the positive electrode discharge switch.
In the embodiment, the fuse is arranged at the positive end or the negative end of each energy storage battery cluster power supply loop; the method can be used for overcurrent and short-circuit protection of the energy storage battery cluster.
In some optional embodiments of the present application, the energy storage battery clusters in the N energy storage battery clusters are arranged in parallel with each other.
In some optional embodiments of the present application, the total positive of the energy storage battery clusters arranged in parallel is connected with the positive input end of the DC-DC converter;
and the total negative end of the energy storage battery cluster arranged in parallel is connected with the negative electrode input end of the DC-DC converter.
In some optional embodiments of the present application, further comprising: a communication module:
the communication module is used for data interaction among the system management controller, the energy storage battery cluster management module and the DC-DC converter.
In some optional embodiments of the present application, the state information comprises voltage information, current information, temperature information, SOC information.
In some optional embodiments of the present application, the DC-DC converter is of a bidirectional conversion type.
According to a second aspect of the embodiments of the present application, there is provided a multi-energy storage battery cluster parallel control system, which may include: the energy storage battery cluster of any embodiment of the first aspect incorporates a control circuit and an electrical load.
In an embodiment of the present application, the connection relationship of the circuit may be:
a. the positive electrode of each energy storage battery cluster is connected with the fuse and the positive electrode discharge switch in sequence and then connected in parallel
b. The negative electrodes of the multiple clusters of energy storage batteries are connected with the negative electrode discharge switch and then connected in parallel;
c. the positive and negative input ends of the DC-DC converter are respectively connected with the total positive and total negative of the battery cluster after parallel connection;
d. one end of a positive charging switch of each energy storage battery cluster is connected with the front end of a positive discharging switch, and the other end of the positive charging switch of each energy storage battery cluster is connected with the positive output end of the DC-DC converter;
e. the output negative electrode of the DC-DC converter is connected with the total negative electrode of the parallel battery cluster;
f. after the multiple clusters of energy storage batteries are connected in parallel, the output electric energy is connected with an electric load to supply power to the outside;
e. the system management controller, the energy storage battery cluster management units of the energy storage battery clusters, the DC-DC converter and the power utilization load are in communication connection through communication lines to form a communication network for data interaction.
In summary, as shown in fig. 1, the control circuit includes: the system comprises energy storage battery clusters 1-n, corresponding energy storage battery cluster management units BCU 1-BCUn, fuses f 1-fn, positive electrode discharge switches K1+ Kn +, positive electrode charge switches KC1+ KCn +, negative electrode switches K1-Kn-, a DC-DC converter, a system management controller SMC and an electricity load. After the energy storage battery clusters 1-n are respectively connected with the fuses f 1-fn in series, a discharge loop is formed by an anode discharge switch K1+ Kn + distributed on the anode and a cathode switch K1-Kn-distributed on the cathode to supply power to an electric load. One end of the positive charging switch KC1+ -KCn + is connected with the output positive end of the DC-DC converter, and the other end is connected between Kn + and fn in parallel and used for supplying power to the energy storage battery clusters 1-n. The input end of the DC-DC converter is connected with the total positive and the total negative of the energy storage battery clusters after being connected in parallel, the output positive of the DC-DC converter is connected with one end of a positive charging switch KC1+ to KCn +, and the output negative is connected with the total negative. And the DC-DC converter is used for executing charging work at proper time according to the control command of the SMC. The fuses f 1-fn are respectively used for overcurrent and short-circuit protection of the energy storage battery clusters 1-n. The BCUs 1-BCUn are respectively used for collecting state information of the energy storage battery clusters 1-n, such as battery voltage, current, temperature, SOC and the like, and executing opening/closing actions of Kn +, Kn-KCn +. And the system management controller SMC is used as a master control unit and is used for coordinating/controlling the work among the DC-DC converter, the BCUs 1-BCUn and the electric loads. The system management controller SMC, the DC-DC converter, the BCUs 1-BCUn and the power loads form a communication network through communication connection for data interaction.
In a third aspect of the embodiments of the present application, as shown in fig. 2, a method for controlling incorporation of multiple energy storage battery clusters is provided, where the method may include:
s210: the system management controller collects voltage information of all energy storage battery clusters in real time;
s220: the system management controller compares the voltage among the energy storage battery clusters according to the real-time data and sorts the voltage;
s230: the system management controller instructs the energy storage battery cluster with the highest voltage to close the corresponding positive discharge switch and negative discharge switch through communication connection;
s240: the system management controller sequentially judges the total pressure of the second highest voltage battery cluster and the total pressure of the energy storage battery clusters which are merged into the system management controller;
s250: if the voltage difference of all the battery clusters is in the range of safe and direct incorporation, all the anode discharge switches and all the cathode switches are directly closed, and the DC-DC converter does not start to work;
s260: if the voltage of the energy storage battery cluster and the total voltage difference of the incorporated energy storage battery cluster are higher than the allowable range, firstly closing a positive electrode charging switch and a negative electrode switch corresponding to the energy storage battery cluster, enabling the DC-DC converter to output appropriate charging parameters to rapidly charge the energy storage battery cluster with lower voltage until the allowable incorporated voltage range is reached, then disconnecting the positive electrode charging switch, and closing the positive electrode discharging switch.
Specifically describing the control method with reference to fig. 1, after the system is powered on, the energy storage battery cluster management unit of each energy storage battery cluster collects and broadcasts voltage information of the corresponding battery cluster; and the system management controller collects information and compares the voltage between the battery clusters, and if the voltage of the energy storage battery cluster n is the highest, the positive and negative electrode discharge switches corresponding to the energy storage battery cluster n are closed. Then sequentially judging the total pressure of the second highest voltage battery cluster and the total pressure of the battery clusters which are already merged into the battery clusters; under an ideal condition, if the system management controller judges that the voltage difference of all the battery clusters is in a range capable of being safely and directly merged, all the anode discharge switches and all the cathode switches are sequentially closed, and the DC-DC converter does not start to work; if the voltage difference between the voltage of the energy storage battery cluster n and the total voltage difference between the voltage of the n-1 battery clusters incorporated in the energy storage battery cluster n is higher than an allowable range in the voltage judging process, closing a positive electrode charging switch and a negative electrode switch corresponding to the energy storage battery cluster n by the system management controller, and enabling the DC-DC converter to output appropriate charging parameters to rapidly charge the energy storage battery cluster n according to a preset algorithm; in the quick charging process, if the system management controller judges that the difference value between the voltage of the energy storage battery cluster n and the total merging voltage is within the allowable range, the output of the energy storage battery cluster n is stopped, then the positive charging switch is switched off, the positive discharging switch is switched on, and the energy storage battery cluster n is merged.
The adopted DC-DC converter can realize energy transfer between the energy storage battery clusters and realize the conditions of consistency and safe incorporation between the energy storage battery clusters. No external energy intervention is required.
The DC-DC converter used may be of the bidirectional type, i.e. it may work in reverse. After the energy storage battery clusters are safely merged, the system management controller controls the anode discharge switches of the energy storage battery clusters to be switched off, the anode charge switches are switched to be switched on and switched to be changed into a discharge loop, and at the moment, the DC-DC converter works reversely to output stable voltage which can be efficiently worked by the electric load.
As shown in fig. 3, after the system is powered on, BCUs 1 to BCUn collect voltage information (U1 to Un) of corresponding battery clusters to broadcast, SMC collects the information and compares the voltage between the battery clusters, and if the voltage U1 of the energy storage battery cluster 1 is the highest, the positive and negative discharge switches K1+ and K1-corresponding to the energy storage battery cluster 1 are first closed. And then sequentially judging the total pressure of the next-highest voltage battery cluster and the total pressure of the battery clusters already merged into the battery clusters, and under the ideal condition, if the voltage difference of all the battery clusters is judged to be in the range capable of being safely and directly merged into the battery clusters, directly closing all the discharge switches K1+ -Kn +, K1-Kn-, and not starting the DC-DC converter. If the voltage difference between the voltage Un of the energy storage battery cluster n and the total voltage U0 of n-1 battery clusters incorporated before is higher than the allowable range in the process of sequentially judging the voltage, the SMC firstly closes KCn + and Kn-, enables the DC-DC converter to output appropriate charging parameters to rapidly charge the energy storage battery cluster n according to a preset algorithm until the allowable incorporated voltage range is reached, and then disconnects KCn +, closes Kn +, and realizes the safe incorporation of the energy storage battery cluster n.
As shown in fig. 4, efficient discharge control in a bidirectional type adopted by the DC-DC converter is explained: when the energy storage battery clusters are safely combined, the battery clusters are charged, and consistency among the battery clusters is kept; after the energy storage battery cluster is safely merged, Kn is disconnected, a switching KCn loop is closed to be changed into a discharging loop, at the moment, the DC-DC converter works reversely, and stable voltage which can be efficiently worked by an electric load is output.
The application aims to protect an energy storage battery cluster merging control circuit and an energy storage battery cluster merging control method, as shown in fig. 1, wherein the energy storage battery cluster merging control circuit comprises energy storage battery clusters 1-n, each energy storage battery cluster is provided with an energy storage battery cluster management unit, and the positive electrode of each energy storage battery cluster is provided with a fuse, a positive electrode discharge switch and a positive electrode charge switch; and a negative electrode switch is arranged at the negative electrode of each energy storage battery cluster. The energy storage system is provided with a system management controller and an electric load. The DC-DC converter is used for executing charging/discharging work in due time according to a control instruction of the system management controller. The fuses are respectively used for overcurrent and short-circuit protection of the energy storage battery clusters 1-n. The energy storage battery cluster management unit is used for acquiring state information of the energy storage battery clusters 1-n, such as battery voltage, current, temperature, SOC and the like, and executing opening/closing actions of the anode discharge switch, the anode charge switch and the cathode switch. And the system management controller is used as a master control unit and is used for coordinating/controlling the work among the DC-DC converter, the energy storage battery cluster management unit and the power load.
The anodes of the multiple clusters of energy storage batteries are connected in parallel after being sequentially connected with the fuse and the anode discharge switch. The cathodes of the multiple clusters of energy storage batteries are connected with the cathode discharge switch in parallel. The circuit is internally provided with a DC-DC converter, and the positive and negative input ends of the DC-DC converter are respectively connected with the total positive and the total negative of the battery cluster after parallel connection. One end of a positive charging switch of each energy storage battery cluster is connected with the front section of the positive discharging switch, and the other end of the positive charging switch is connected with the positive output end of the DC-DC converter. And the output negative electrode of the DC-DC converter is connected with the total negative electrode of the parallel battery clusters. After the multiple clusters of energy storage batteries are connected in parallel, the output electric energy is connected with an electric load to supply power to the outside. The system management controller, each energy storage battery cluster management unit, the DC-DC converter and the power utilization load form a communication network to carry out mutual data interaction, and are in communication connection through a communication line.
In addition, as shown in fig. 3, the present application also provides a method for controlling incorporation of an energy storage battery cluster, including: after the system is powered on, the energy storage battery cluster management unit of each energy storage battery cluster collects voltage information of the corresponding battery cluster to be broadcast, the system management controller collects the information and compares the voltage among the battery clusters, and if the voltage n of the energy storage battery cluster is the highest, the positive and negative electrode discharge switches corresponding to the energy storage battery cluster n are closed firstly. And then sequentially judging the total pressure of the next-highest-voltage battery cluster and the total pressure of the battery clusters which are already merged into the battery clusters, and under an ideal condition, if the voltage difference of all the battery clusters is judged to be in a range capable of being safely and directly merged into the battery clusters, directly closing all the anode discharge switches and the cathode switches, and not starting the DC-DC converter. If the voltage difference between the voltage of the energy storage battery cluster n and the total voltage difference between the voltage of the n-1 battery clusters incorporated in the energy storage battery cluster n is higher than the allowable range in the process of sequentially judging the voltage, the system management controller firstly closes a positive charging switch and a negative switch corresponding to the energy storage battery cluster n, enables the DC-DC converter to output appropriate charging parameters to rapidly charge the energy storage battery cluster n according to a preset algorithm, stops the charging until the allowable voltage range is reached, then opens the positive charging switch, closes a positive discharging switch, and realizes the safe incorporation of the energy storage battery cluster n.
Considering the wide adaptability of the matching relation between the voltage of the energy storage system and the voltage of the load, the DC-DC converter can also be of a bidirectional conversion type, and the reverse work of the DC-DC converter is realized through the overall identification and control of the system management controller. When the energy storage battery clusters are safely combined, the energy storage battery clusters have the function of charging the battery clusters, and the consistency among the energy storage battery clusters is kept; after the energy storage battery clusters are safely merged, the anode discharge switches of the energy storage battery clusters are controlled to be switched off, the anode charge switches are switched to be switched on to become a discharge loop, at the moment, the DC-DC converter works reversely, and stable voltage capable of efficiently working of the power load is output. This reverse mode compares the voltage fluctuation when direct battery voltage work, and output voltage (with the input voltage of electric load) is more stable to promote whole energy storage power supply system's efficiency, reduced the energy consumption. Due to the bidirectional working property of the DC-DC converter, the voltage of the energy storage battery cluster and the voltage of the electric load are decoupled, and the configuration of the energy storage battery cluster and the voltage of the electric load is more flexible.
Through the structural characteristics of the control circuit adopted by the embodiment of the application, the energy can be supplemented mutually between the energy storage battery clusters in the energy storage system in an energy transfer mode, and finally the consistency of the state is achieved, so that the safety and the reliability of merging of multiple battery clusters are ensured. The adopted DC-DC converter has high efficiency and small energy loss in general. On the premise of ensuring reasonable battery charging rate, a single DC-DC converter with larger power can be adopted, so that rapid energy transfer among energy storage battery clusters is realized, and the energy loss is minimum. Meanwhile, the control circuit can expand various practical application working condition scenes, such as automatic maintenance, a charging process and a discharging process, and can automatically adjust the state consistency among the energy storage battery clusters by designing a reasonable control method. Meanwhile, the further bidirectional DC-DC converter can realize stable output of the working voltage of the reverse operation after safe incorporation, so that the electric load can work efficiently, and the highest efficiency of the whole system can be obtained.
The control circuit is simple in structure and easier to engineer compared with the common technical scheme. The whole energy storage system is only provided with one DC-DC converter and a related control circuit switch, and compared with other schemes such as a mode that each battery cluster is provided with the DC-DC converter, the cost is greatly reduced.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An energy storage system control circuit with multiple energy storage battery clusters connected in parallel is characterized by comprising:
the energy storage system comprises N energy storage battery clusters, wherein N is a positive integer;
the energy storage battery cluster management modules correspond to the energy storage battery clusters one by one, and are used for acquiring state information of the corresponding energy storage battery clusters and managing the corresponding battery clusters according to the acquired information and preset control logic;
the system management controller is used for sending out a control signal according to the status information of the gathered N energy storage battery clusters so that the energy storage battery cluster management module controls the corresponding energy storage battery cluster;
and a DC-DC converter for performing a charging/discharging operation according to the control signal.
2. The energy storage system control circuit for energy storage battery clusters connected in parallel according to claim 1, wherein the energy storage system of the energy storage battery cluster comprises:
a management module of the energy storage battery cluster; a positive discharge switch;
the positive charging switch is connected with the positive discharging switch in parallel, and the positive charging switch and the positive discharging switch are both arranged at the positive electrode of the corresponding energy storage battery cluster;
the negative electrode switch is arranged at the negative electrode of the corresponding energy storage battery cluster;
and the management module of the energy storage battery cluster is used for acquiring the state information of the energy storage battery cluster corresponding to the management module and executing the opening/closing actions of the positive electrode discharging switch, the positive electrode charging switch and the negative electrode switch according to the preset control logic.
3. The energy storage system control circuit for energy storage battery clusters connected in parallel according to claim 2, wherein the energy storage system of the energy storage battery cluster further comprises: a fuse;
the fuse is arranged between the corresponding energy storage battery cluster and the positive electrode discharge switch.
4. The energy storage system control circuit with the energy storage battery clusters connected in parallel according to claim 1, wherein the energy storage battery clusters in the N energy storage battery clusters are connected in parallel with each other.
5. The energy storage system control circuit with the energy storage battery clusters connected in parallel according to claim 4, wherein the total positive of the energy storage battery clusters arranged in parallel is connected with the positive input end of the DC-DC converter;
and the total negative end of the energy storage battery cluster arranged in parallel is connected with the negative electrode input end of the DC-DC converter.
6. The energy storage system control circuit for energy storage battery clusters connected in parallel according to claim 1, further comprising: communication connection:
the communication connection is used for data interaction among the system management controller, the N energy storage battery cluster management modules and the DC-DC converter.
7. The energy storage system control circuit of claim 1, wherein the state information comprises voltage information, current information, temperature information, and SOC information.
8. The energy storage system control circuit for energy storage battery clusters connected in parallel according to claim 1, wherein the DC-DC converter is of a bidirectional conversion type.
9. A multi-energy storage battery cluster parallel control system is characterized by comprising: an energy storage system control circuit and an electric load connected in parallel with the energy storage battery cluster of any one of claims 1 to 8.
10. A multi-energy storage battery cluster merging control method is characterized by comprising the following steps:
the system management controller collects voltage information of all energy storage battery clusters in real time;
the system management controller compares the voltage among the energy storage battery clusters according to the real-time data and sorts the voltage;
the system management controller instructs the energy storage battery cluster with the highest voltage to close the corresponding positive discharge switch and negative discharge switch through communication connection;
the system management controller sequentially judges the total pressure of the second highest voltage battery cluster and the total pressure of the energy storage battery clusters which are merged into the system management controller;
if the voltage difference of all the battery clusters is in the range capable of being safely and directly merged, all the anode discharge switches and all the cathode discharge switches are directly closed, and the DC-DC converter is not started to work;
if the voltage of the energy storage battery cluster and the total voltage difference of the incorporated energy storage battery cluster are higher than the allowable range, firstly closing a positive electrode charging switch and a negative electrode switch corresponding to the energy storage battery cluster, enabling the DC-DC converter to output appropriate charging parameters to rapidly charge the energy storage battery cluster with lower voltage until the allowable incorporated voltage range is reached, then disconnecting the positive electrode charging switch, and closing the positive electrode discharging switch.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115986883A (en) * | 2023-01-19 | 2023-04-18 | 深圳市超创鑫科技有限公司 | Energy storage system and control method thereof |
| CN116054341A (en) * | 2023-02-12 | 2023-05-02 | 深圳市未蓝新能源科技有限公司 | Battery cluster topology for lithium ion battery energy storage system and battery cluster control method |
| CN116599180A (en) * | 2023-05-26 | 2023-08-15 | 上海采日能源科技有限公司 | Household energy storage system and control method thereof |
| CN116799833A (en) * | 2023-04-18 | 2023-09-22 | 新源智储能源发展(北京)有限公司 | Multi-battery cluster parallel charge and discharge control system and method |
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2022
- 2022-05-13 CN CN202210523565.2A patent/CN114977381A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115986883A (en) * | 2023-01-19 | 2023-04-18 | 深圳市超创鑫科技有限公司 | Energy storage system and control method thereof |
| CN116054341A (en) * | 2023-02-12 | 2023-05-02 | 深圳市未蓝新能源科技有限公司 | Battery cluster topology for lithium ion battery energy storage system and battery cluster control method |
| CN116054341B (en) * | 2023-02-12 | 2024-05-14 | 深圳市未蓝新能源科技有限公司 | Battery cluster control method of battery cluster topology for lithium ion battery energy storage system |
| CN116799833A (en) * | 2023-04-18 | 2023-09-22 | 新源智储能源发展(北京)有限公司 | Multi-battery cluster parallel charge and discharge control system and method |
| CN116799833B (en) * | 2023-04-18 | 2024-04-19 | 新源智储能源发展(北京)有限公司 | Multi-battery cluster parallel charge and discharge control system and method |
| CN116599180A (en) * | 2023-05-26 | 2023-08-15 | 上海采日能源科技有限公司 | Household energy storage system and control method thereof |
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