CN112086981A - Method for gradient utilization of entire retired battery pack and micro-grid energy storage system - Google Patents
Method for gradient utilization of entire retired battery pack and micro-grid energy storage system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 129
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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
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/84—Recycling of batteries or fuel cells
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a method for gradient utilization of a whole package of retired batteries and a micro-grid energy storage system. The method for gradient utilization of the whole package of the retired battery comprises the following steps: the method comprises the steps of building a microgrid energy storage system, controlling power on and controlling power off. The micro-grid energy storage system is built and controlled according to the gradient utilization method of the whole package of the retired batteries. According to the invention, the ex-service battery is recycled by constructing the micro-grid energy storage system by utilizing the whole package of the ex-service battery in a gradient manner.
Description
Technical Field
The invention relates to the field of retired battery recycling, in particular to a method for whole package echelon utilization of retired batteries and a micro-grid energy storage system.
Background
In recent years, with the increasing exhaustion of global petroleum resources and the vigorous promotion of national encouragement policies, the new energy automobile industry becomes a strategic novel industry of key development in China, the development is rapid, and the trans-epoch revolution of the intellectualization and the electromotion of the automobile industry is preliminarily realized. Meanwhile, the power storage battery of the new energy automobile also faces large-scale retirement. According to the statistical data of the Chinese automobile technical research center, 20 ten thousand tons of power storage batteries are expected to be out of service in 2020, and 78 ten thousand tons or more can be expected to be achieved in 2025. Therefore, the well-done recycling of the power storage battery is an important basis for guaranteeing the healthy and orderly development of the new energy automobile industry.
However, China has many problems in power storage battery recovery, and the specific manifestations are that the power storage battery recovery industrial chain is imperfect, the recovery system is not perfect, the recovery technology is difficult to be high, the retired battery residue is low, the battery upgrade iteration is fast, the recovery price is disordered, the potential safety hazard of storage and transportation environment is large, the industry specification is lost, and the like. In the face of such huge recycling pressure and challenge of the retired storage battery, the recycling of raw materials for the retired storage battery becomes an urgent technical problem to be solved.
Disclosure of Invention
In view of the above, the invention provides a method for gradient utilization of a whole package of retired batteries and a micro-grid energy storage system, so as to solve the technical problems that the existing retired batteries are difficult to recycle and reuse raw materials.
In order to solve the above problems, the present invention provides a method for echelon utilization of a whole package of retired batteries, which comprises the following steps:
building a microgrid energy storage system, namely building a microgrid energy storage system by using a whole package of retired batteries with at least two specifications, wherein the microgrid energy storage system comprises an energy storage converter, an energy management system and a protocol conversion unit; one end of the energy storage converter is connected with the retired battery, and the other end of the energy storage converter is connected with an external power grid through a main switch; the energy management system is connected with the energy storage converter; one end of the protocol conversion unit is connected with the retired battery, and the other end of the protocol conversion unit is connected with the energy management system and the energy storage converter;
a power-on control step, wherein when the micro-grid energy storage system needs to provide electric energy for an external power grid, the energy management system initiates a power-on request to the protocol conversion unit, the protocol conversion unit performs hard-line awakening on the retired storage battery and performs self-detection, and the retired storage battery waits for standby after the self-detection is finished; the energy management system sends a high-voltage command on the battery to the energy storage converter and carries out self-checking, and the energy management system stands by after the self-checking is finished; when the retired battery and the energy storage converter are standby and have no fault at the same time, the energy management system sends a battery power-on command to the retired battery to the protocol conversion unit, and information is fed back to the energy management system and the energy storage converter after the retired battery is powered on; the energy management system sends an external grid power-on command to the energy storage converter, and the energy storage converter closes the main switch after detecting the power-on information of the retired battery, so that energy interaction between the micro-grid energy storage system and an external power grid is realized; and
a power-off control step, wherein when the microgrid energy storage system needs to be disconnected from an external power grid, the energy management system sends a power-off command to the energy storage converter, and the energy storage converter disconnects the main switch to cut off energy interaction with the external power grid and feeds information back to the energy management system; and the energy management system sends a battery power-off command to the protocol conversion unit to the retired battery, and the retired battery enters a delayed dormancy state after power-off is finished.
Further, in the step of building the microgrid energy storage system, the microgrid energy storage system further comprises a Distributed Control System (DCS) which is connected with the energy management system, the energy storage converter and the protocol conversion unit.
Further, in the step of building the micro-grid energy storage system, the retired battery and the protocol conversion unit adopt CAN communication; the protocol conversion unit is communicated with the energy storage converter by adopting a Modbus RTU (remote terminal Unit), the energy storage converter is a master station, and the protocol conversion unit is a slave station; the protocol conversion unit and the energy management system are communicated by adopting Modbus TCP, the energy management system is a master station, and the protocol conversion unit is a slave station.
Further, in the step of building the microgrid energy storage system, the number of channels connecting the energy storage converters with the retired batteries is more than or equal to the number of the retired batteries; the number of channels connecting the protocol conversion unit with the retired battery is greater than or equal to the number of the retired batteries.
Further, in the step of building the microgrid energy storage system, the external power grid is three-phase alternating current.
Further, in the step of building the microgrid energy storage system, the total battery capacity of the microgrid energy storage system is 250 kWh; the working voltage range of the retired battery is 200V-900V.
Further, the decommissioned battery is provided with an ignition signal pin and a high-voltage relay; the energy management system or the protocol conversion unit controls the retired battery to wake up or sleep through the ignition signal pin; and the energy management system or the protocol conversion unit controls the power-on or power-off of the retired battery by closing or opening the high-voltage relay.
Further, the method for gradient utilization of the whole pack of retired batteries further comprises the following steps: and an alarming step, namely, when faults exist in the self-detection of the energy management system, the energy storage converter, the protocol conversion unit and the retired battery, an alarm signal is sent out.
Further, the method for gradient utilization of the whole pack of retired batteries further comprises the following steps: and a battery replacing step, namely replacing a retired battery with the same software architecture and the working voltage range consistent with that of the energy storage converter when the retired battery has a fault or the service life is ended.
The invention also provides a micro-grid energy storage system which is built and controlled according to the method for the gradient utilization of the whole package of the retired batteries.
The method and the micro-grid energy storage system have the advantages that the ex-service battery is reused by building the micro-grid energy storage system for the whole package echelon utilization of the ex-service battery. Compared with the traditional scheme of applying the retired battery module to perform echelon utilization, the whole package echelon utilization scheme does not need to break up and disassemble the retired battery package, so that not only are the complicated disassembling procedures reduced, but also the safety risk of operators is greatly reduced; compared with the construction of the energy storage system, the maintenance of the energy storage system and the replacement of the retired battery in the later period of the energy storage system, the labor cost and the economic cost can be saved to the greatest extent; the protocol conversion unit is used for uniformly addressing and information interaction of the retired storage batteries, so that the problem of redevelopment or secondary development of battery management unit software of the retired battery pack can be ingeniously solved, and the problems of ID superposition, battery information disorder and inconvenience in processing of each retired battery are solved; meanwhile, the energy storage system scheme is not limited by the echelon utilization of a single-model retired battery system, and the retired battery has wide source approaches: namely, as long as the same software architecture platform is satisfied, the working voltage range is consistent with the direct current side of the PCS, and retired power storage batteries with different types, different capacities, different shapes and volumes, different voltage platforms and the like can be applied to the energy storage system.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flowchart of a method for echelon utilization of a whole pack of retired batteries according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the microgrid energy storage system in the embodiment of the present invention;
fig. 3 is a schematic diagram of a connection structure of the microgrid energy storage system in the embodiment of the present invention;
FIG. 4 is a control logic diagram of the power-up control step in the embodiment of the present invention;
FIG. 5 is a control logic diagram of the power down control step in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As shown in FIG. 1, in the embodiment of the present invention, a method for ladder utilization of a whole pack of retired batteries is provided, which includes steps S1-S5.
S1, building a microgrid energy storage system, namely building a microgrid energy storage system by using a whole package of retired batteries of at least two specifications, as shown in fig. 2 and 3, where the microgrid energy storage system 10 includes an energy storage converter (hereinafter referred to as PCS)1, an energy management system (hereinafter referred to as EMS)2, a protocol conversion unit (hereinafter referred to as ECU)3, and the retired batteries (ESS) 4; one end of the energy storage converter 1 is connected with the retired battery 4, and the other end of the energy storage converter is connected with an external power grid through a main switch; the energy management system 2 is connected with the energy storage converter 1; one end of the protocol conversion unit 3 is connected with the retired battery 4, and the other end of the protocol conversion unit is connected with the energy management system 2 and the energy storage converter 1.
The retired battery 4 preferably selects a new energy automobile power storage battery of the same software architecture platform after retirement, a recovery unit evaluates the retired battery 4 package by safety screening (the detailed screening scheme can refer to relevant national laws and regulations and relevant enterprise standards of battery factories), and divides the qualified retired power storage battery package which meets the design life and safety requirements of the energy storage system; the screened retired power storage battery is directly installed on a vertical battery frame (the retired battery 4 frame can be planned and designed according to the practical application condition of the energy storage system);
the high and low voltage physical connections of the energy storage system may be referred to as follows:
1) high-pressure part: the high-voltage output interface of each retired power storage battery is connected with a single independent direct current channel of a PCS (a PCS of the type selected by the energy storage system must be mutually independent for each channel) through a high-voltage wire harness;
2) a low-pressure part: the low-voltage interface of each retired power storage battery is connected with a single channel of a protocol conversion unit 3 (the protocol conversion unit 3 needs to be provided with a plurality of channels, each channel CAN independently supply power to the power storage battery system and wake up the power storage battery system, CAN independently perform up-down high-voltage operation on the power storage battery, and simultaneously has a plurality of channels connected with CAN communication interfaces of the batteries and RS485 communication interfaces of PCS and EMS), and the low-voltage interface of each retired power storage battery is automatically addressed and used for collecting battery information, and finally, the low-voltage interface of each retired power storage battery is communicated and interacted with the EMS, the PCS and the DCS through the.
In this embodiment, in the step of building the microgrid energy storage system, the number of channels through which the energy storage converters 1 are connected with the retired batteries 4 is greater than or equal to the number of the retired batteries 4; the number of channels connecting the protocol conversion unit 3 and the retired battery 4 is greater than or equal to the number of the retired batteries 4.
In this embodiment, in the step of building the microgrid energy storage system, the external power grid is a three-phase alternating current.
In this embodiment, in the step of building the microgrid energy storage system, the total battery capacity of the microgrid energy storage system is 250 kWh; the working voltage range of the retired battery 4 is 200V-900V.
As shown in fig. 2, the microgrid energy storage system further includes a Distributed Control System (DCS)5, which is connected to the energy management system 2, the energy storage converter 1, and the protocol conversion unit 3. The Distributed Control System (DCS)5 can realize program automation control.
As shown in fig. 3, the microgrid energy storage system is composed of 1 PCS with 15 channels, 1 protocol conversion unit 3 with 15 channels, and 9 retired power storage battery systems (with a maximum practical capacity of 15).
The energy storage converter 1 is specifically selected as follows: the 15-channel PCS was selected, and the technical parameters are as follows: the method can be applied to retired power storage batteries with the working voltage range of 200V-900V, and the PCS has 15 direct current channels in total and are mutually independent.
The type selection of the protocol conversion unit 3 is as follows: the 15-channel protocol conversion unit 3 is selected, and the technical parameters are as follows: the ECU has an automatic addressing function for the retired power storage battery, also has low-voltage power supply and hard line awakening functions for the retired power storage battery, and has CAN communication and RS485 communication functions with the plurality of ECUs.
The type of the retired battery 4 is as follows: two types of retired power storage battery systems are selected, the number of the batteries of the A type is 6 (corresponding to PCS Chanel 4-9), the number of the batteries of the B type is 3 (corresponding to PCS Chanel 1-1, 2-1 and 3-1), and the technical parameters are as follows.
Technical parameter table for A-type retired power storage battery
| 1 | Cell parameters | 102Ah/3.65 |
|
| 2 | | 1P6S | |
| 3 | | 16x1P6S | |
| 4 | Rated voltage of system (V) | 350.4 |
|
| 5 | System operating voltage range (V) | 269～ |
|
| 6 | System nominal capacity (Ah) | |
|
| 7 | Nominal energy of system (kWh) | 35.7 |
|
| 8 | Application temperature range (DEG C) | -20～60 |
|
| 9 | Weight (kg) | |
|
| 10 | Size (mm) | 1579x1166x190 |
Technical parameter table for B-type retired power storage battery
| 1 | Cell parameters | 37Ah/3.65 |
|
| 2 | | lPl5S | |
| 3 | | 6xlP6S | |
| 4 | Rated voltage of system (V) | |
|
| 5 | System operating voltage range (V) | 252～ |
|
| 6 | System nominal capacity (Ah) | |
|
| 7 | Nominal energy of system (kWh) | 12.154 |
|
| 8 | Application temperature range (DEG C) | -20～60 |
|
| 9 | Weight (kg) | |
|
| 10 | Size (mm) | 1162x998x264 |
It should be noted that the retired battery 4 may include other types, and this case only takes the a-type battery and the B-type battery as an example for description, and the other types are built in the same way.
In this embodiment, the retired battery 4 has an ignition signal pin and a high-voltage relay; the energy management system 2 or the protocol conversion unit 3 controls the retired battery 4 to wake up or sleep through the ignition signal pin; the energy management system 2 or the protocol conversion unit 3 controls the power-on or power-off of the retired battery 4 by closing or opening the high-voltage relay.
In this embodiment, in the step of building the microgrid energy storage system, the retired battery 4 and the protocol conversion unit 3 communicate with each other by using a CAN; the protocol conversion unit 3 and the energy storage converter 1 are communicated by adopting a Modbus RTU, the energy storage converter 1 is a master station, and the protocol conversion unit 3 is a slave station; the protocol conversion unit 3 and the energy management system 2 adopt Modbus TCP communication, the energy management system 2 is a master station, and the protocol conversion unit 3 is a slave station.
The protocol conversion unit 3 is used for addressing and information integration of the microgrid energy storage system built by the retired storage battery, and a communication protocol table is as follows:
s2, performing power-on control, wherein when the micro-grid energy storage system needs to provide electric energy for an external power grid, the energy management system 2 sends a power-on request to the protocol conversion unit 3, the protocol conversion unit 3 performs hard-line awakening on the retired storage battery and performs self-test, and the retired storage battery waits for the power supply after the self-test is finished; the energy management system 2 sends a high-voltage instruction on the battery to the energy storage converter 1, carries out self-checking and stands by after the self-checking is finished; when the retired battery 4 and the energy storage converter 1 are in standby and have no fault at the same time, the energy management system 2 sends a battery power-on command to the protocol conversion unit 3 to the retired battery 4, and after the retired battery 4 is powered on, information is fed back to the energy management system 2 and the energy storage converter 1; the energy management system 2 sends an external power grid power-on command to the energy storage converter 1, and the energy storage converter 1 closes the main switch after detecting power-on information of the retired battery 4, so that energy interaction between the micro-grid energy storage system and an external power grid is realized.
That is, after various retired power storage battery systems of different specifications installed on the battery frame are physically and reliably connected with the PCS, the protocol conversion unit 3, the EMS, and the DCS, as shown in fig. 4, the upper high voltage control logic is:
a. when the energy storage system needs to provide electric energy for an external power grid, the EMS sends a power-on request to the protocol conversion unit 3, the protocol conversion unit 3 performs hard-line awakening and self-checking on the retired battery system, and the retired battery system stands by after the self-checking is finished;
EMS sends awakening to PCS and carries out self-checking, and waits for standby after the self-checking is finished;
c. when the retired battery 4 and the PCS are armed simultaneously and have no fault, the EMS sends a power-on command of the protocol conversion unit 3, and the retired battery 4 is powered on and feeds back the EMS and the PCS;
and d, the EMS sends a PCS electrifying command, and the PCS closes the internal switch after detecting the electrification information of the retired battery 4, so that the energy interaction between the energy storage system and an external alternating current power grid is realized.
S3, a power-off control step, wherein when the microgrid energy storage system needs to be disconnected from an external power grid, the energy management system 2 sends a power-off command to the energy storage converter 1, the energy storage converter 1 disconnects the main switch to cut off energy interaction with the external power grid, and information is fed back to the energy management system 2; the energy management system 2 sends a battery power-off command to the protocol conversion unit 3 to the retired battery 4, and the retired battery 4 enters a delayed sleep state after power-off is finished.
As shown in fig. 5, the logic of the lower high voltage is opposite to the upper high voltage, that is, after the PCS is switched to be connected to the external power grid, the protocol conversion unit 3 sends a power-down command to the retired battery 4, so that the retired battery 4 cuts off the dc high voltage and enters a sleep mode. In the up-down high-voltage process or the energy interaction process, when detecting that the PCS or the retired battery 4 has a serious fault, the strategy that the PCS firstly cuts off the external power grid and the retired battery 4 is powered down is adopted, so that the application safety of the energy storage system is guaranteed.
And S4, alarming, namely, when faults exist in the self-inspection of the energy management system 2, the energy storage converter 1, the protocol conversion unit 3 and the retired battery 4, sending an alarm signal. Wherein the alarming step S4, the power-on control step S2 and the power-off control step S3 are performed and exist at the same time.
And S5, replacing the retired battery 4 with the same software architecture and the working voltage range consistent with that of the energy storage converter 1 when the retired battery 4 has a fault or the service life is over.
The invention also provides a micro-grid energy storage system which is built and controlled according to the method for the gradient utilization of the whole package of the retired batteries.
The method and the micro-grid energy storage system have the advantages that the ex-service battery is reused by building the micro-grid energy storage system for the whole package echelon utilization of the ex-service battery. Compared with the traditional scheme of applying the retired battery module to perform echelon utilization, the whole package echelon utilization scheme does not need to break up and disassemble the retired battery package, so that not only are the complicated disassembling procedures reduced, but also the safety risk of operators is greatly reduced; compared with the construction of the energy storage system, the maintenance of the energy storage system and the replacement of the retired battery in the later period of the energy storage system, the labor cost and the economic cost can be saved to the greatest extent; the protocol conversion unit is used for uniformly addressing and information interaction of the retired storage batteries, so that the problem of redevelopment or secondary development of battery management unit software of the retired battery pack can be ingeniously solved, and the problems of ID superposition, battery information disorder and inconvenience in processing of each retired battery are solved; meanwhile, the energy storage system scheme is not limited by the echelon utilization of a single-model retired battery system, and the retired battery has wide source approaches: namely, as long as the same software architecture platform is satisfied, the working voltage range is consistent with the direct current side of the PCS, and retired power storage batteries with different types, different capacities, different shapes and volumes, different voltage platforms and the like can be applied to the energy storage system.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express some exemplary embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for gradient utilization of a whole retired battery pack is characterized by comprising the following steps:
building a microgrid energy storage system, namely building a microgrid energy storage system by using a whole package of retired batteries with at least two specifications, wherein the microgrid energy storage system comprises an energy storage converter, an energy management system and a protocol conversion unit; one end of the energy storage converter is connected with the retired battery, and the other end of the energy storage converter is connected with an external power grid through a main switch; the energy management system is connected with the energy storage converter; one end of the protocol conversion unit is connected with the retired battery, and the other end of the protocol conversion unit is connected with the energy management system and the energy storage converter;
a power-on control step, wherein when the micro-grid energy storage system needs to provide electric energy for an external power grid, the energy management system initiates a power-on request to the protocol conversion unit, the protocol conversion unit performs hard-line awakening on the retired storage battery and performs self-detection, and the retired storage battery waits for standby after the self-detection is finished; the energy management system sends a high-voltage command on the battery to the energy storage converter and carries out self-checking, and the energy management system stands by after the self-checking is finished; when the retired battery and the energy storage converter are standby and have no fault at the same time, the energy management system sends a battery power-on command to the retired battery to the protocol conversion unit, and information is fed back to the energy management system and the energy storage converter after the retired battery is powered on; the energy management system sends an external grid power-on command to the energy storage converter, and the energy storage converter closes the main switch after detecting the power-on information of the retired battery, so that energy interaction between the micro-grid energy storage system and an external power grid is realized; and
a power-off control step, wherein when the microgrid energy storage system needs to be disconnected from an external power grid, the energy management system sends a power-off command to the energy storage converter, and the energy storage converter disconnects the main switch to cut off energy interaction with the external power grid and feeds information back to the energy management system; and the energy management system sends a battery power-off command to the protocol conversion unit to the retired battery, and the retired battery enters a delayed dormancy state after power-off is finished.
2. The method for echelon utilization of entire decommissioned batteries according to claim 1, wherein in the step of building the microgrid energy storage system, the microgrid energy storage system further comprises
And the distributed control system DCS is connected with the energy management system, the energy storage converter and the protocol conversion unit.
3. The method for echelon utilization of entire decommissioned batteries according to claim 1, wherein in the step of building the microgrid energy storage system,
the retired battery and the protocol conversion unit adopt CAN communication;
the protocol conversion unit is communicated with the energy storage converter by adopting a Modbus RTU (remote terminal Unit), the energy storage converter is a master station, and the protocol conversion unit is a slave station;
the protocol conversion unit and the energy management system are communicated by adopting Modbus TCP, the energy management system is a master station, and the protocol conversion unit is a slave station.
4. The method for echelon utilization of entire decommissioned batteries according to claim 1, wherein in the step of building the microgrid energy storage system,
the number of channels for connecting the energy storage converter and the retired battery is more than or equal to that of the retired battery;
the number of channels connecting the protocol conversion unit with the retired battery is greater than or equal to the number of the retired batteries.
5. The method for echelon utilization of the entire decommissioned battery pack according to claim 1, wherein in the step of building the microgrid energy storage system, the external power grid is three-phase alternating current.
6. The method for echelon utilization of entire decommissioned batteries according to claim 1, wherein in the step of building the microgrid energy storage system, the total battery capacity of the microgrid energy storage system is 250 kWh; the working voltage range of the retired battery is 200V-900V.
7. The method for the echelon utilization of an entire pack of decommissioned batteries according to claim 1, wherein the decommissioned batteries have an ignition signal pin and a high voltage relay; the energy management system or the protocol conversion unit controls the retired battery to wake up or sleep through the ignition signal pin; and the energy management system or the protocol conversion unit controls the power-on or power-off of the retired battery by closing or opening the high-voltage relay.
8. The method for the echelon utilization of a whole pack of retired batteries according to claim 1, further comprising:
and an alarming step, namely, when faults exist in the self-detection of the energy management system, the energy storage converter, the protocol conversion unit and the retired battery, an alarm signal is sent out.
9. The method for the echelon utilization of a whole pack of retired batteries according to claim 1, further comprising:
and a battery replacing step, namely replacing a retired battery with the same software architecture and the working voltage range consistent with that of the energy storage converter when the retired battery has a fault or the service life is ended.
10. A microgrid energy storage system is characterized in that the method for ladder utilization of the entire package of retired batteries according to claim 1 is used for building and controlling.
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