Backup and storage integrated control device and method based on dynamic reconfiguration

Abstract

The invention discloses a backup and storage integrated control device and method based on dynamic reconfiguration, and relates to the field of energy storage and backup power, and the device comprises a plurality of backup and storage integrated energy network cards which are correspondingly connected with a plurality of battery modules in an energy storage and backup power system, communication ends of all the standby and storage integrated energy network cards are connected with a first port of the digital energy control module; a second port of the digital energy control module is connected with a communication interface of a power environment monitoring system in the energy storage standby power system; and the digital energy control module is used for acquiring the voltage and current of the battery module, determining the charge-discharge state of the energy storage standby power system, and adjusting the voltage of the battery module by adopting a dynamic equalization strategy according to the charge-discharge state of the energy storage standby power system. Dynamic balance adjustment of charging and discharging of the battery module can be achieved only by correspondingly connecting the digital energy control module and the multiple standby and storage integrated energy network cards with the existing battery module, overall transformation of the energy storage standby power system is not needed, and the transformation cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage and backup power, and in particular to a dynamically reconfigurable backup and storage integrated control device and method. Background Art

[0002] Lithium iron phosphate battery packs have been widely used in various communication energy storage scenarios such as communication base stations and central computer rooms due to their safety, stability, high efficiency and long life. They are composed of several battery modules and battery management systems and are generally used as backup power. With the development of technology and the requirements of peak shaving and valley filling, digital intelligent lithium battery products on the market are gradually expanding their market share. Their working principle is based on a bidirectional DC / DC power conversion module, which realizes dynamic charge and discharge control of the battery through bidirectional step-up and step-down power conversion. When multiple digital intelligent lithium batteries are used in parallel, the capacity, average floating charge voltage, current limit point, etc. of the lithium battery can be set separately to realize the functions of parallel digital intelligent lithium battery constant voltage discharge, nuclear capacity detection, and self-peak shifting.

[0003] At present, in the energy storage backup process of various communication energy storage scenarios such as communication base stations and central computer rooms, there is a problem of excessive or low voltage of a single battery module, which affects the overall charging and discharging efficiency of the system. If intelligent upgrades are carried out, the high initial investment is not conducive to economic efficiency. In addition, during the execution of the peak-valley arbitrage strategy, the bidirectional DC-DC power conversion control method is complex and the power rate loss is large. Summary of the invention

[0004] The purpose of this application is to provide a dynamically reconfigurable integrated storage and backup control device and method, which can realize dynamic balanced regulation of battery module charging and discharging, without the need for overall transformation of the energy storage and backup power system, greatly reducing the initial investment.

[0005] To achieve the above objectives, this application provides the following solutions.

[0006] In the first aspect, the present application provides a dynamically reconfigurable integrated backup and storage control device, the device comprising: a digital energy control module and a plurality of integrated backup and storage energy network cards; the plurality of integrated backup and storage energy network cards are respectively connected to a plurality of battery modules in an energy storage and backup power system, and the communication terminals of all the integrated backup and storage energy network cards are connected to the first port of the digital energy control module; the integrated backup and storage energy network card is used to obtain the voltage and current of the corresponding battery module; the second port of the digital energy control module is connected to the communication interface of a power environment monitoring system in the energy storage and backup power system; the digital energy control module is used to obtain the voltage and current of the battery module, determine the charge and discharge state of the energy storage and backup power system according to the current direction of the battery module, and adjust the voltage of the battery module according to the charge and discharge state of the energy storage and backup power system using a dynamic balancing strategy.

[0007] In the second aspect, the present application provides a dynamically reconfigurable integrated backup and storage control method, which applies the dynamically reconfigurable integrated backup and storage control device described above, and the method includes: obtaining the voltage and current of all battery modules; determining the charge and discharge state of the energy storage backup power system according to the direction of the current of any battery module; and adjusting the voltage of the battery module using a dynamic balancing strategy according to the charge and discharge state of the energy storage backup power system.

[0008] According to the specific embodiments provided in this application, this application discloses the following technical effects.

[0009] This application connects multiple integrated energy network cards with multiple battery modules in the energy storage and backup power system respectively, and the communication terminals of all integrated energy network cards are connected to the first port of the digital energy control module; the second port of the digital energy control module is connected to the communication interface of the power environment monitoring system in the energy storage and backup power system; the digital energy control module is used to obtain the voltage and current of the battery module, determine the charge and discharge state of the energy storage and backup power system, and according to the charge and discharge state of the energy storage and backup power system, a dynamic balancing strategy is used to adjust the voltage of the battery module. It only needs to connect the digital energy control module and multiple integrated energy network cards with the existing battery modules to achieve dynamic balancing adjustment of battery module charging and discharging, without the need to carry out overall transformation of the energy storage and backup power system, thereby reducing the transformation cost. In addition, this application uses a boost circuit to replace the bidirectional DC-DC power conversion control in the energy storage process, thereby reducing power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 A structural connection diagram of a dynamically reconfigurable backup and storage integrated control device provided in an embodiment of the present application.

[0012] Figure 2 A schematic diagram of the structural connection between a single battery module and an integrated energy storage network card provided in an embodiment of the present application.

[0013] Figure 3 A structural connection diagram of the energy network card with integrated backup and storage provided in an embodiment of the present application.

[0014] Figure 4 A flowchart of a dynamically reconfigurable backup and storage integrated control method provided in an embodiment of the present application.

[0015] Explanation of symbols: energy storage integrated network card-1, micro control unit-11, first insulated gate field effect transistor-12, second insulated gate field effect transistor-13, boost circuit-14 and digital energy control module-2. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Embodiment 1, as Figure 1-Figure 2 As shown, this embodiment provides a dynamically reconfigurable backup and storage integrated control device, the device comprising: a digital energy control module 2 and a plurality of backup and storage integrated energy network cards 1.

[0019] Multiple integrated energy storage network cards 1 are respectively connected to multiple battery modules in the energy storage backup system, and the communication ends of all integrated energy storage network cards 1 are connected to the first port of the digital energy control module 2; the integrated energy storage network card 1 is used to obtain the voltage and current of the corresponding battery module.

[0020] The second port of the digital energy control module 2 is connected to the communication interface of the power environment monitoring system in the energy storage backup power system; the digital energy control module 2 is used to obtain the voltage and current of the battery module, determine the charge and discharge state of the energy storage backup power system according to the current direction of the battery module, and use a dynamic balancing strategy to adjust the voltage of the battery module according to the charge and discharge state of the energy storage backup power system.

[0021] Furthermore, the charge and discharge state of the energy storage backup power system is determined according to the current direction of the battery module, and according to the charge and discharge state of the energy storage backup power system, a dynamic balancing strategy is adopted to adjust the voltage of the battery module, specifically including: when the energy storage backup power system is powered by AC mains and the current direction of the battery module is inflow, the charge and discharge state of the energy storage backup power system is charging; when the energy storage backup power system is not powered by AC mains and the current direction of the battery module is outflow, the charge and discharge state of the energy storage backup power system is backup power; when the charge and discharge state of the energy storage backup power system is charging, according to the voltage of each battery module, adopt The dynamic balancing strategy adjusts the voltage of the battery module until charging is completed; when the charge and discharge state of the energy storage backup power system is backup power, the dynamic balancing strategy is used to adjust the voltage of the battery module according to the voltage of each battery module until discharging is completed; the dynamic balancing strategy specifically includes: when the charge and discharge state of the energy storage backup power system is charging, dynamically selecting the battery module whose voltage exceeds the first threshold to stop charging, and controlling the charging of the remaining battery modules; when the charge and discharge state of the energy storage backup power system is discharging, dynamically selecting the battery module whose voltage is lower than the first threshold to stop discharging, and controlling the discharging of the remaining battery modules.

[0022] In actual application, the current module specifically includes: a battery module, a battery management system (BMS), a rectifier module and a load; the input end of the rectifier module is connected to the AC mains, the output end of the rectifier module is respectively grounded to the positive pole of the battery module (BAT+), the communication end of the battery management system and one end of the load, the negative pole of the battery module (BAT-) is connected to the input end of the battery management system, and the output end of the battery management system and the other end of the load are respectively connected to the negative pole of the battery module (-48V terminal).

[0023] Optionally, the communication mode between the communication terminal of the energy storage integrated network card 1 and the first port of the digital energy control module 2 is RS485 communication.

[0024] like Figure 3 As shown, further, the energy storage integrated network card 1 specifically includes: a first insulated gate field effect transistor 12, a second insulated gate field effect transistor 13 and a micro control unit 11 (MCU).

[0025] The source of the first insulated gate field effect transistor 12 is connected to the output end of the battery module (the P-terminal of the battery management system BMS), the drain of the first insulated gate field effect transistor 12 is connected to the drain of the second insulated gate field effect transistor 13, and the gate of the first insulated gate field effect transistor 12 is connected to the first port of the micro control unit 11.

[0026] The source of the second insulated gate field effect transistor 13 is connected to the negative electrode (−48V terminal) of the battery module, and the gate of the second insulated gate field effect transistor 13 is connected to the second port of the micro control unit 11 .

[0027] The third port of the micro control unit 11 is connected to the communication terminal of the battery module, and the fourth port of the micro control unit 11 is connected to the first port of the digital energy control module 2 .

[0028] In actual application, the micro control unit 11 obtains the current, voltage and temperature values ​​of the battery module through the current sampling circuit, the voltage sampling circuit and the temperature sampling circuit. The micro control unit 11 is connected to the digital energy control module 2 through the communication circuit to realize cascade communication with each backup energy network card 1.

[0029] Furthermore, the energy network card 1 with backup and storage integrated also includes: a boost circuit 14 .

[0030] The negative electrode of the input end of the boost circuit 14 is connected to the drain of the first insulated gate field effect transistor 12, the positive electrode of the input end of the boost circuit 14 is connected to the positive electrode of the battery module (connected to the RNT+ terminal), the negative electrode of the output end of the boost circuit 14 is connected to the source of the second insulated gate field effect transistor 13, the positive electrode of the output end of the boost circuit 14 is connected to the positive electrode of the battery module, and the control port of the boost circuit 14 is connected to the fifth port of the micro control unit 11.

[0031] The communication port of the boost circuit 14 is connected to the fourth port of the port micro control unit 11 .

[0032] Furthermore, the energy storage integrated network card 1 also includes a short circuit detection circuit.

[0033] The output end of the short-circuit detection circuit is connected to the sixth port of the micro-control unit 11. When the short-circuit detection circuit detects that the current value of the battery module exceeds a preset value, the short-circuit detection circuit sends a short-circuit signal to the micro-control unit 11, and controls the backup energy network card 1 to disconnect through the micro-control unit.

[0034] Furthermore, the energy network card 1 with integrated backup and storage also includes an indicator light and an indicator light.

[0035] The control end of the indicator light is connected to the seventh port of the micro control unit 11; the indicator light is used to display the charging and discharging status of the battery module or the fault status of the backup energy network card 1.

[0036] Furthermore, the third port of the digital energy control module 2 is also connected to the communication terminal of the battery module; the digital energy control module 2 is also used to obtain the single cell voltage, single cell temperature, operating current and voltage of each battery module, and upload them to the power environment monitoring system.

[0037] In actual application, the digital energy control module 2 also includes a DI input interface and a DO output interface; the digital energy control module 2 is connected to the fire-fighting temperature switch through the DI input interface, and the temperature switch equipped with the passive fire-fighting module is activated due to excessive temperature, and the signal is transmitted to the dry contact. After receiving the signal, the digital energy control module 2 quickly sends a command to the backup integrated energy network card, cuts off the battery module from the external main circuit, and uploads the signal to the FSU. The digital energy control module 2 is connected to the backup integrated energy network card DI input interface through the DO output interface, and controls the output of the DO output interface according to the self-defined dynamic reconfigurable strategy, thereby controlling the first insulated gate field effect transistor 12, the second insulated gate field effect transistor 13 and the boost circuit 14 of the backup integrated energy network card to work.

[0038] Optionally, the third port of the digital energy control module 2 also communicates with the output end of the battery module via RS485.

[0039] Furthermore, the battery module is a battery module in an energy storage backup system of a communication base station.

[0040] Embodiment 2, as Figure 4 As shown, this embodiment also provides a dynamically reconfigurable backup and storage integrated control method, the dynamically reconfigurable backup and storage integrated control method applies the above dynamically reconfigurable backup and storage integrated control device, and the method includes the following steps.

[0041] S1. Get the voltage and current of all battery modules.

[0042] S2. Determine the charge and discharge state of the energy storage backup system according to the direction of the current of any battery module.

[0043] S3. According to the charging and discharging status of the energy storage backup system, a dynamic balancing strategy is used to adjust the voltage of the battery module.

[0044] Furthermore, the dynamically reconfigurable integrated control method for backup and storage also includes: when the charging and discharging state of the energy storage backup power system is energy storage, all battery modules are boosted and discharged according to the peak-valley arbitrage strategy until the discharge is completed; energy storage is the battery module supplying power to the load when there is AC mains power supply.

[0045] Peak-valley arbitrage strategy is a trading strategy in the energy market that mainly uses the difference in electricity prices between peak hours (i.e., periods of high electricity demand) and valley hours (i.e., periods of low electricity demand) in the power system to make profits. The specific operation is to buy or store electricity during the valley hours when electricity prices are lower, and then sell or release electricity during the peak hours when electricity prices are higher, thereby earning the difference between the electricity prices of the two periods.

[0046] The technical effects of the present invention are as follows.

[0047] First, finely control each battery module to ensure dynamic balance of the battery module, fundamentally eliminating the short board effect of the battery system, extending the service life of the battery module, and improving the safety and economy of the battery system.

[0048] Second, by formulating a discharge strategy, not only can the battery module be discharged directly with an efficiency of nearly 100% in the backup power scenario, but it can also be output through the boost circuit in the device for use as energy storage, thereby achieving peak shaving and valley filling and peak-valley arbitrage.

[0049] Third, the transformation cost is low. Compared with the bidirectional DC-DC digital intelligent lithium battery products, which require the replacement of all the original backup battery modules, the dynamically reconfigurable integrated backup control device only needs to add a device to the original backup battery module cabinet.

[0050] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A dynamically reconfigurable backup and storage integrated control device, characterized in that: The dynamically reconfigurable integrated backup and storage control device comprises: a digital energy control module and a plurality of integrated backup and storage energy network cards; The plurality of integrated energy storage network cards are respectively connected to the plurality of battery modules in the energy storage backup system, and the communication terminals of all the integrated energy storage network cards are connected to the first port of the digital energy control module; the integrated energy storage network card is used to obtain the voltage and current of the corresponding battery module; The second port of the digital energy control module is connected to the communication interface of the power environment monitoring system in the energy storage backup power system; the digital energy control module is used to obtain the voltage and current of the battery module, determine the charge and discharge state of the energy storage backup power system according to the current direction of the battery module, and use a dynamic balancing strategy to adjust the voltage of the battery module according to the charge and discharge state of the energy storage backup power system.

2. The dynamically reconfigurable integrated control device for backup and storage according to claim 1 is characterized in that: The charge and discharge state of the energy storage backup system is determined according to the current direction of the battery module, and the voltage of the battery module is adjusted using a dynamic balancing strategy according to the charge and discharge state of the energy storage backup system, including: When the energy storage backup power system is powered by AC mains and the current direction of the battery module is inflow, the charge and discharge state of the energy storage backup power system is charging; when the energy storage backup power system is not powered by AC mains and the current direction of the battery module is outflow, the charge and discharge state of the energy storage backup power system is backup power; When the charge and discharge state of the energy storage backup power system is charging, the voltage of the battery module is adjusted according to the voltage of each battery module by a dynamic balancing strategy until charging is completed; when the charge and discharge state of the energy storage backup power system is backup, the voltage of the battery module is adjusted according to the voltage of each battery module by a dynamic balancing strategy until discharging is completed; the dynamic balancing strategy specifically includes: when the charge and discharge state of the energy storage backup power system is charging, dynamically selecting a battery module whose voltage exceeds a first threshold to stop charging, and controlling the charging of the remaining battery modules; when the charge and discharge state of the energy storage backup power system is discharging, dynamically selecting a battery module whose voltage is lower than the first threshold to stop discharging, and controlling the discharging of the remaining battery modules.

3. The dynamically reconfigurable integrated control device for backup and storage according to claim 1 is characterized in that: The energy network card with integrated backup and storage specifically comprises: a first insulated gate field effect transistor, a second insulated gate field effect transistor and a micro control unit; The source of the first insulated gate field effect transistor is connected to the output end of the battery module, the drain of the first insulated gate field effect transistor is connected to the drain of the second insulated gate field effect transistor, and the gate of the first insulated gate field effect transistor is connected to the first port of the micro control unit; The source electrode of the second insulated gate field effect transistor is connected to the negative electrode of the battery module, and the gate electrode of the second insulated gate field effect transistor is connected to the second port of the micro control unit; The third port of the micro control unit is connected to the communication terminal of the battery module, and the fourth port of the micro control unit is connected to the first port of the digital energy control module.

4. The dynamically reconfigurable integrated backup and storage control device according to claim 3 is characterized in that: The energy network card with integrated backup and storage further includes: a boost circuit; The negative electrode of the input end of the boost circuit is connected to the drain of the first insulated gate field effect transistor, the positive electrode of the input end of the boost circuit is connected to the positive electrode of the battery module, the negative electrode of the output end of the boost circuit is connected to the source of the second insulated gate field effect transistor, the positive electrode of the output end of the boost circuit is connected to the positive electrode of the battery module, and the control port of the boost circuit is connected to the fifth port of the micro control unit.

5. The dynamically reconfigurable integrated control device for backup and storage according to claim 3 is characterized in that: The energy network card with integrated backup and storage also includes a short circuit detection circuit; The output end of the short-circuit detection circuit is connected to the sixth port of the micro-control unit. When the short-circuit detection circuit detects that the current value of the battery module exceeds a preset value, the short-circuit detection circuit sends a short-circuit signal to the micro-control unit, and the micro-control unit controls the integrated energy network card to disconnect.

6. The dynamically reconfigurable integrated control device for backup and storage according to claim 3 is characterized in that: The energy network card with integrated backup and storage also includes: an indicator light; The control end of the indicator light is connected to the seventh port of the micro control unit; the indicator light is used to display the charging and discharging status of the battery module or the fault status of the backup energy network card.

7. The dynamically reconfigurable integrated control device for backup and storage according to claim 1 is characterized in that: The third port of the digital energy control module is also connected to the communication terminal of the battery module; the digital energy control module is also used to obtain the single cell voltage, single cell temperature, operating current and voltage of each battery module, and upload them to the power environment monitoring system.

8. The dynamically reconfigurable integrated control device for backup and storage according to claim 1 is characterized in that: The battery module is a battery module in the energy storage backup system of a communication base station.

9. A dynamically reconfigurable backup and storage integrated control method, characterized in that: The dynamically reconfigurable integrated control method for backup and storage is applicable to the dynamically reconfigurable integrated control device for backup and storage as described in any one of claims 1 to 8, and the dynamically reconfigurable integrated control method for backup and storage comprises: Get the voltage and current of all battery modules; Determine the charge and discharge state of the energy storage backup system according to the direction of the current of any battery module; According to the charging and discharging status of the energy storage backup system, a dynamic balancing strategy is used to adjust the voltage of the battery module.

10. The method for controlling the backup and storage integration based on dynamic reconfiguration according to claim 9 is characterized in that: The dynamically reconfigurable integrated backup and storage control method also includes: when the charging and discharging state of the energy storage backup power system is energy storage, all battery modules are boosted and discharged according to the peak-valley arbitrage strategy until the discharge is completed; the energy storage is the battery module supplying power to the load when there is AC mains power supply.

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