CN113765180A - Charging and discharging management system and management method for modular battery energy storage system - Google Patents
Charging and discharging management system and management method for modular battery energy storage system Download PDFInfo
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- CN113765180A CN113765180A CN202110961585.3A CN202110961585A CN113765180A CN 113765180 A CN113765180 A CN 113765180A CN 202110961585 A CN202110961585 A CN 202110961585A CN 113765180 A CN113765180 A CN 113765180A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 119
- 238000007599 discharging Methods 0.000 title claims abstract description 24
- 238000007726 management method Methods 0.000 title claims description 66
- 230000005611 electricity Effects 0.000 claims abstract description 11
- 239000011159 matrix material Substances 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating 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
- H02J7/0063—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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charge-discharge management system of a modular battery energy storage system, which comprises an energy management module, an energy storage converter, a plurality of battery modules, a plurality of chargers and a gating module, wherein each battery module and each charger are respectively connected with a direct current bus and the gating module; the energy storage converter is connected with the alternating current bus and the direct current bus; the gating module is used for selectively connecting the battery module with the charger according to the control signal; the energy management module is used for controlling the on-off modes of the battery module, the charger and the gating module according to a preset charging and discharging management rule to carry out unified charging and discharging of the modular battery energy storage system. According to the invention, through unified charging and discharging management of a plurality of battery modules, the battery modules can be integrated for energy storage at the user side, so that the power supply reliability is improved; and the peak-valley price difference arbitrage can be realized by utilizing energy storage, and the electricity consumption cost is reduced.
Description
Technical Field
The invention relates to the technical field of battery energy storage, in particular to a charging and discharging management method of a modular battery energy storage system.
Background
With the rapid development of lithium ion battery technology and the implementation of the national policy of carbon peak carbon neutralization, the application of lithium ion batteries in the field of energy storage is wider and wider. At present, two application modes of lithium ion batteries exist in the field of energy storage, one of which is an integrated battery energy storage system (such as an energy storage shelter, an energy storage cabinet and the like) for fixed in-situ electric energy storage and release; the other is a modular battery energy storage system (such as a charger), which is charged by a charger and then is used in a mobile way, and the charging process and the discharging process of the modular battery energy storage system are changed in physical positions. Aiming at special application requirements of field troops, armed police, fire fighting, emergency disaster relief and the like, the modularized energy storage systems are used for going out for tasks in a large amount, but in a task-free period, the modularized energy storage systems have the following problems in the aspects of use and maintenance: 1. when the modularized energy storage batteries are stored uniformly, the modularized energy storage batteries cannot be used as an energy storage system with large capacity for office and living areas, and the functions of improving the power supply reliability and benefiting peak and valley electricity prices by the energy storage system to reduce the electricity consumption cost cannot be exerted; 2. the modularized energy storage battery needs to be charged and maintained regularly, if each battery module is provided with one charger, the number of the chargers is large, so that the purchase cost is high, and if a plurality of battery modules share one charger, the workload of personnel is increased; 3. when the emergency task comes, all the battery modules may be in a non-full-power state, which may cause adverse effects on the power utilization guarantee of the outgoing task. Therefore, through unified charging and discharging management of a plurality of battery modules, the battery module has the effect that the integrated energy storage system is used for storing energy at the user side, and also has the effect that the battery modules are flexibly moved, so that the use efficiency and the application field of the battery modules are greatly improved.
At present, all can only concentrate to charge to modularization energy storage system, the back exclusive use of taking out after the end of charging, its charge management mode has three kinds: the first is that each battery module has a built-in charging management module, and when the battery module is charged in a centralized manner, the battery rack provides stable direct current power supplies of 5V, 24V and the like, such as a shared charger; in the second mode, each battery module is externally connected with a charger, and the battery rack only provides an alternating current power supply and serves as a storage place for the battery modules; the third is that only a small amount of chargers are arranged on the battery rack, and the battery modules are connected in batches for charging.
For the first mode, since the portable battery module has very strict requirements on volume and weight, the volume and weight of the battery module are increased by integrating the charging management module into the battery module, and particularly, the problem of the volume and weight of the charging management module is more prominent when quick charging is required. For the second mode, the equipment purchase cost is high due to the large number of chargers. In addition, the lithium ion battery generally cannot be in a float state for a long time, and the lithium ion battery has a self-discharge phenomenon during long-term storage, so that it is necessary to perform charge maintenance periodically. For the third mode, since the battery modules can only be charged in batches, especially the lithium ion batteries need to be charged and maintained regularly, and a specially-assigned person is required to charge and manage when the number of the battery modules is large. In the three modes, the battery module is only used when the battery module needs to be taken out, the use frequency of the battery is very low, the efficiency of the battery module cannot be fully exerted, and the resource waste exists.
Disclosure of Invention
The invention aims to provide a management system and a management method capable of performing unified charging and discharging management on a modular battery energy storage system, aiming at the problems in the prior art.
In order to achieve the purpose, the charging and discharging management system of the modular battery energy storage system comprises an energy management module, an energy storage converter, a plurality of battery modules, a plurality of chargers and a gating module, wherein each battery module and each charger are respectively connected with a direct current bus and the gating module, and a control switch for controlling the battery module to be connected with or disconnected from the direct current bus is arranged in each battery module;
the energy storage converter is connected with an alternating current bus and a direct current bus and is used for bidirectional power conversion and energy storage between the alternating current bus and the direct current bus;
the gating module is used for selectively connecting the battery module with the charger according to a control signal;
the energy management module is respectively in communication connection with the battery modules, the chargers, the gating module and the energy storage converter and is used for controlling the on-off modes of the battery modules, the chargers and the gating module according to a preset charging and discharging management rule to carry out unified charging and discharging of the modular battery energy storage system.
Further, the energy management module includes: the first detection unit is used for sending a request for detecting the voltage of the direct current bus to the battery module; the first comparison unit is used for comparing the difference value between the voltage of the battery module and the detected voltage of the direct current bus with a preset value; and the control unit is used for controlling the control switch of the battery module to be closed when the difference value between the voltage of the battery module and the voltage of the direct current bus is less than or equal to the preset value, so that the battery module is conducted with the direct current bus and discharges electricity to the energy storage converter, or controlling the control switch of the battery module to be closed when the difference value between the voltage of the battery module and the voltage of the direct current bus is greater than the preset value, so that the battery module is disconnected with the direct current bus.
Further, the gating module is a matrix switch, and the energy management module further comprises: the second detection unit is used for sending a request for detecting whether the energy storage converter is connected with an external power supply to the energy storage converter; the control unit is further used for controlling the switch switching in the matrix switch according to the electric quantity of the battery module when the energy storage converter is connected into an external power supply, selectively connecting the battery module with the charger, enabling the charger to be conducted with the direct-current bus and charging the battery module by the external power supply.
Further, the energy management module further comprises: the second comparison unit is used for comparing the electric quantity of the battery modules with a preset threshold value and the electric quantity among all the battery modules; the control unit is also used for the energy storage converter does not have external power source and inserts and all battery module's electric quantity is less than when predetermineeing the threshold value, according to the electric quantity size control between all battery module switch in the matrix switch and battery module's control switch are closed, pass through the charger with low-power battery module and high-power battery module selectively and be connected, make low-power battery module charge to high-power battery module.
Further, the direct current bus voltage is 5V, 12V, 24V, 28V, 48V or 270V.
Further, the number of the plurality of chargers is smaller than the number of the plurality of battery modules.
The invention discloses a charge-discharge management method of a modular battery energy storage system, which comprises the following steps:
sending a request for detecting the voltage of the direct current bus to the battery module when the modular battery energy storage system discharges to the outside;
comparing the difference value between the voltage of the battery module and the detected voltage of the direct current bus with a preset value;
and when the difference value between the voltage of the battery module and the voltage of the direct current bus is smaller than or equal to the preset value, controlling a control switch of the battery module to be closed, so that the battery module is conducted with the direct current bus and discharges to the energy storage converter.
Further, the charge and discharge management method of the modular battery energy storage system further comprises the following steps: when a battery module is charged through an external power supply, a request for detecting whether the energy storage converter is connected to the external power supply is sent to the energy storage converter; when the energy storage converter is connected to an external power supply, the switch in the matrix switch is controlled according to the electric quantity of the battery module, the battery module is selectively connected with the charger, the charger is conducted with the direct-current bus, and the battery module is charged by the external power supply.
Further, the charge and discharge management method of the modular battery energy storage system further comprises the following steps:
when the battery modules are mutually charged, comparing the electric quantity of the battery modules with a preset threshold value and the electric quantity among all the battery modules; the energy storage converter does not have external power source and inserts and all battery module's electric quantity is less than when predetermineeing the threshold value, control switch closure according to the switch in the electric quantity size control matrix switch between all battery module and battery module selectively passes through the charger with low-power battery module and high-power battery module and is connected, makes low-power battery module charge to high-power battery module.
According to the invention, the energy management module is used for carrying out unified charging and discharging management on a plurality of battery modules, on one hand, the plurality of battery modules can be integrated to be used as an integrated energy storage system for user side energy storage, so that the stored energy can be supplied to a terminal user when power failure occurs, and the electric energy interruption is avoided; and the peak-valley price difference arbitrage can be realized by utilizing energy storage, and the electricity consumption cost is reduced.
In addition, intelligent charging management is carried out on a plurality of battery modules, so that the number of chargers is reduced, electric energy in the battery modules can be concentrated into partial battery modules, and the battery modules with relatively large electric quantity can be used by being taken out under extreme conditions.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a charge and discharge management system of a modular battery energy storage system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a charge/discharge management method for a modular battery energy storage system according to an embodiment of the invention;
fig. 3 is a schematic flow chart illustrating a charge/discharge management method for a modular battery energy storage system according to another embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a charge/discharge management method of a modular battery energy storage system according to another embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the charge and discharge management system of the modular battery energy storage system includes an energy management module 10, an energy storage converter 20, a plurality of battery modules, a plurality of chargers and a gating module 30, where each battery module and each charger are respectively connected to a dc bus and the gating module 30, and a control switch for controlling the connection or disconnection between the battery module and the dc bus is arranged in each battery module;
the energy storage converter 20 is connected with an alternating current bus and a direct current bus and is used for bidirectional power conversion and energy storage between the alternating current bus and the direct current bus;
the gating module 30 is used for selectively connecting the battery module with the charger according to a control signal;
the energy management module 10 is respectively in communication connection with the plurality of battery modules, the plurality of chargers, the gating module 30 and the energy storage converter 20, and is configured to control the on-off modes of the battery modules, the chargers and the gating module 30 according to a predetermined charging and discharging management rule to perform unified charging and discharging of the modular battery energy storage system.
According to the invention, the energy management module is used for carrying out unified charging and discharging management on a plurality of battery modules, on one hand, the plurality of battery modules can be integrated to be used as an integrated energy storage system for user side energy storage, so that the stored energy can be supplied to a terminal user when power failure occurs, and the electric energy interruption is avoided; and the peak-valley price difference arbitrage can be realized by utilizing energy storage, and the electricity consumption cost is reduced.
The invention adopts the DC bus shared by the battery module output and the charger, can realize that part of the electric quantity of the battery module is used for charging other battery modules, realizes that the electric quantity in a plurality of battery modules is concentrated to a few battery modules under extreme no condition, and ensures that the battery module has high electric quantity for being used by an external belt under special conditions. Compared with a common battery module energy storage system, the battery module automatic grid-connected output and bidirectional energy storage converter is adopted to complete power conversion between the direct current bus and the alternating current bus, and unified charging and discharging of the energy storage system are realized, so that the modularized energy storage system has the in-situ electricity storage and discharging functions of the integrated energy storage system.
The energy storage converter 20 realizes bidirectional power conversion between a 220V or 380V alternating current bus and a direct current bus, wherein the direct current bus voltage can be 5V, 12V, 24V, 28V, 48V, 270V and the like. The charger is used for charging the battery module, and each charger can only charge one battery at a time. The gating module 30 may adopt a matrix type arrangement of switches in a matrix type switch circuit, wherein the switches may be controllable switches such as relay switches, MOS tube switches, IGBT switches, contactors, and the like. By controlling the on-off state and the off state of the switch in the matrix switch circuit, any charger can be flexibly controlled to charge any battery module. By adopting the matrix switch charging circuit, a small amount of chargers can be used for completing automatic batch charging of a plurality of battery modules, so that the requirement on the number of the chargers is reduced, and the requirement on the operation of a worker is also reduced. The battery module is used for storing and releasing electric energy, switches (controllable switches such as a relay switch, an MOS tube switch, an IGBT switch and a contactor) in the battery module are in an off state during charging, and switches in the battery module are in an on state during discharging. The energy management module 10 communicates with the energy storage converter, the charger, the matrix switch circuit, the battery module and the like through communication modes such as CAN, RS232 and the like, and completes related control management. It should be noted that, in this embodiment, only 3 chargers and 9 battery modules are taken as an example, and the number of the chargers and the number of the battery modules may be flexibly increased or decreased in actual product design.
The energy management module 10 includes a first detection unit, a first comparison unit, and a control unit, where the first detection unit is configured to send a request for detecting a dc bus voltage to the battery module. The battery module automatically detects the voltage of the dc bus after receiving the request of the first detecting unit, and feeds back the detected voltage of the dc bus to the energy management module 10. The first comparison unit is used for comparing the difference value between the voltage of the battery module and the detected voltage of the direct current bus with a preset value, and controlling the control unit to charge and discharge according to a preset charging and discharging management rule according to a comparison result output by the first comparison unit. The control unit is used for controlling the control switch of the battery module to be closed when the difference value between the voltage of the battery module and the voltage of the direct current bus is smaller than or equal to the preset value, so that the battery module is conducted with the direct current bus and discharges electricity to the energy storage converter 20, or controlling the control switch of the battery module to be closed when the difference value between the voltage of the battery module and the voltage of the direct current bus is larger than the preset value, so that the battery module is disconnected with the direct current bus. The energy storage converter 20 converts the electric power in the direct current bus into alternating current for output, so that the modular battery energy storage system can output the electric power to the outside uniformly.
The energy management module 10 further includes a second detection unit, and the second detection unit is configured to send a request to the energy storage converter 20 to detect whether the energy storage converter 20 is connected to an external power supply. After receiving the request of the second detection unit, the energy storage converter 20 automatically detects whether it is connected to the external power supply, and feeds back the result to the energy management module 10. The control unit is used for controlling the switch switching in the matrix switch according to the electric quantity of the battery module when the energy storage converter 20 is connected with an external power supply, selectively connecting the battery module with the charger, enabling the charger to be conducted with the direct current bus and charging the battery module by the external power supply. The charger is connected to a direct current bus, and the switch in the matrix switch charging circuit is switched, so that a small number of chargers charge a plurality of battery modules in batches, for example, three chargers in the figure charge 9 battery modules in three batches respectively. During the whole charging process, the output control switch of the battery module is turned off.
The energy management module 10 further includes a second comparing unit, and the energy management module 10 manages the respective electric quantities sent by all the battery modules in a unified manner. The second comparison unit is used for comparing the electric quantity of the battery modules with a preset threshold value and electric quantity among all the battery modules. When the electric quantity of the battery module is lower than the preset threshold value, the electric quantity of the battery module is low, the second comparison unit compares the electric quantities among all the battery modules, the electric quantities among all the battery modules can be obtained, and the electric quantities can be sequenced according to the electric quantities. The control unit is used for energy storage converter 20 does not have external power source and inserts and all battery module's electric quantity is less than when predetermineeing the threshold value, according to the electric quantity size control between all battery module switch in the matrix switch and battery module's control switch are closed, and the selectivity passes through the charger with low-power battery module and high-power battery module and is connected, charges to the lower battery module of electric quantity by the higher battery module of electric quantity, realizes that all battery module's electric quantity is concentrated to a few battery module, guarantees still that the battery module that the electric quantity is high can supply to take the use outward when the next task. For example, the energy management unit controls the switches K71, K72, K73, K24, K44 and K64 to be turned off, the output switches of the battery modules 4 to 9 are closed to discharge electricity, the electric energy on the dc bus charges the battery modules 1 to 3 through the chargers 1 to 3, so that the electric quantity in all the battery modules is concentrated to the battery modules 1 to 3, and the battery modules 1 to 3 can be taken out for use when a task is required. The battery modules are respectively provided with a manual switch, and when the battery modules need to be taken out for use, the switches are switched off, so that the battery modules can be taken out under the normal operation state of the whole energy storage system; when the external battery module needs to be accessed into the system after returning, the manual switch can be closed after the electrical connection is completed, and the battery module can automatically judge whether to participate in the discharge of the energy storage battery or send a charging request to the energy management module of the energy storage system.
As shown in fig. 2, the charge and discharge management method for the modular battery energy storage system includes the following steps:
step S200: and when the modularized battery energy storage system discharges to the outside, sending a request for detecting the voltage of the direct current bus to the battery module.
Step S210: and comparing the difference value between the voltage of the battery module and the detected voltage of the direct current bus with a preset value.
Step S220: and when the difference value between the voltage of the battery module and the voltage of the direct current bus is smaller than or equal to the preset value, controlling a control switch of the battery module to be closed, so that the battery module is conducted with the direct current bus and discharges to the energy storage converter.
When discharging, the battery modules can be uniformly connected into the direct current bus by controlling the switch of the battery modules, and the electric power in the direct current bus is converted into alternating current for output through the energy storage converter, so that the modular battery energy storage system can uniformly output the alternating current.
As shown in fig. 3, the charge and discharge management method for the modular battery energy storage system further includes the following steps:
step S300: when the battery module is charged through an external power supply, a request for detecting whether the energy storage converter is connected with the external power supply is sent to the energy storage converter.
Step S310: when the energy storage converter is connected to an external power supply, the switch in the matrix switch is controlled according to the electric quantity of the battery module, the battery module is selectively connected with the charger, the charger is conducted with the direct-current bus, and the battery module is charged by the external power supply.
When charging, the output of the battery module and the charger share the DC bus, the gating module selectively connects the charger and the battery module, a small number of chargers can be used for charging a plurality of battery modules, and the size and the cost of the system are reduced.
As shown in fig. 4, the charge and discharge management method for the modular battery energy storage system further includes the following steps:
step S400: when the battery modules are mutually charged, comparing the electric quantity of the battery modules with a preset threshold value and the electric quantity among all the battery modules;
step S410: the energy storage converter does not have external power source and inserts and all battery module's electric quantity is less than when predetermineeing the threshold value, control switch closure according to the switch in the electric quantity size control matrix switch between all battery module and battery module selectively passes through the charger with low-power battery module and high-power battery module and is connected, makes low-power battery module charge to high-power battery module.
When no external power supply is connected to the system for a long time and the electric quantity of the battery module is not high, the battery module can output and the charger can share the direct current bus, the switch of the gating module is controlled, the electric quantity of part of the battery modules can be used for charging other battery modules, the electric quantity of a plurality of battery modules is concentrated in a small number of battery modules under the extremely-free condition, and the battery module is ensured to have high electric quantity to be used by an external belt under the special condition.
In conclusion, the battery modules are subjected to unified charging and discharging management, so that on one hand, the battery modules can be integrated to be used as an integrated energy storage system for user side energy storage, the stored energy can be supplied to a terminal user when power failure occurs, and the electric energy interruption is avoided; the peak-valley price difference arbitrage can be realized by utilizing the stored energy, and the electricity consumption cost is reduced; on the other hand, intelligent charging management is carried out on a plurality of battery modules, so that the number of chargers is reduced, electric energy in the battery modules can be concentrated into partial battery modules, and the battery modules with relatively large electric quantity can be used by being taken out under extreme conditions.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiment of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiment of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A charge and discharge management system of a modular battery energy storage system is characterized by comprising an energy management module, an energy storage converter, a plurality of battery modules, a plurality of chargers and a gating module, wherein each battery module and each charger are respectively connected with a direct current bus and the gating module;
the energy storage converter is connected with an alternating current bus and a direct current bus and is used for bidirectional power conversion and energy storage between the alternating current bus and the direct current bus;
the gating module is used for selectively connecting the battery module with the charger according to a control signal;
the energy management module is respectively in communication connection with the battery modules, the chargers, the gating module and the energy storage converter and is used for controlling the on-off modes of the battery modules, the chargers and the gating module according to a preset charging and discharging management rule to carry out unified charging and discharging of the modular battery energy storage system.
2. The modular battery energy storage system charge and discharge management system of claim 1, wherein the energy management module comprises:
the first detection unit is used for sending a request for detecting the voltage of the direct current bus to the battery module;
the first comparison unit is used for comparing the difference value between the voltage of the battery module and the detected voltage of the direct current bus with a preset value;
and the control unit is used for controlling the control switch of the battery module to be closed when the difference value between the voltage of the battery module and the voltage of the direct current bus is less than or equal to the preset value, so that the battery module is conducted with the direct current bus and discharges electricity to the energy storage converter, or controlling the control switch of the battery module to be closed when the difference value between the voltage of the battery module and the voltage of the direct current bus is greater than the preset value, so that the battery module is disconnected with the direct current bus.
3. The modular battery energy storage system charge-discharge management system of claim 2, wherein the gating module is a matrix switch, the energy management module further comprising:
the second detection unit is used for sending a request for detecting whether the energy storage converter is connected with an external power supply to the energy storage converter;
the control unit is further used for controlling the switch switching in the matrix switch according to the electric quantity of the battery module when the energy storage converter is connected into an external power supply, selectively connecting the battery module with the charger, enabling the charger to be conducted with the direct-current bus and charging the battery module by the external power supply.
4. The modular battery energy storage system charge and discharge management system of claim 3, wherein the energy management module further comprises:
the second comparison unit is used for comparing the electric quantity of the battery modules with a preset threshold value and the electric quantity among all the battery modules;
the control unit is also used for the energy storage converter does not have external power source and inserts and all battery module's electric quantity is less than when predetermineeing the threshold value, according to the electric quantity size control between all battery module switch in the matrix switch and battery module's control switch are closed, pass through the charger with low-power battery module and high-power battery module selectively and be connected, make low-power battery module charge to high-power battery module.
5. The modular battery energy storage system charge and discharge management system of claim 1, wherein the dc bus voltage is 5V, 12V, 24V, 28V, 48V, or 270V.
6. A charge and discharge management method for a modular battery energy storage system is characterized by comprising the following steps:
sending a request for detecting the voltage of the direct current bus to the battery module when the modular battery energy storage system discharges to the outside;
comparing the difference value between the voltage of the battery module and the detected voltage of the direct current bus with a preset value;
and when the difference value between the voltage of the battery module and the voltage of the direct current bus is smaller than or equal to the preset value, controlling a control switch of the battery module to be closed, so that the battery module is conducted with the direct current bus and discharges to the energy storage converter.
7. The modular battery energy storage system charge-discharge management method of claim 6, further comprising:
when a battery module is charged through an external power supply, a request for detecting whether the energy storage converter is connected to the external power supply is sent to the energy storage converter;
when the energy storage converter is connected to an external power supply, the switch in the matrix switch is controlled according to the electric quantity of the battery module, the battery module is selectively connected with the charger, the charger is conducted with the direct-current bus, and the battery module is charged by the external power supply.
8. The modular battery energy storage system charge-discharge management method of claim 7, further comprising:
when the battery modules are mutually charged, comparing the electric quantity of the battery modules with a preset threshold value and the electric quantity among all the battery modules;
the energy storage converter does not have external power source and inserts and all battery module's electric quantity is less than when predetermineeing the threshold value, control switch closure according to the switch in the electric quantity size control matrix switch between all battery module and battery module selectively passes through the charger with low-power battery module and high-power battery module and is connected, makes low-power battery module charge to high-power battery module.
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