CN109167109B - Dual multistage power limiting protection system based on frequency modulation energy storage system - Google Patents
Dual multistage power limiting protection system based on frequency modulation energy storage system Download PDFInfo
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- 230000009977 dual effect Effects 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims description 62
- 238000012545 processing Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 6
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 206010068065 Burning mouth syndrome Diseases 0.000 description 38
- 230000006872 improvement Effects 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 9
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H02J7/0026—
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- H02J7/0077—
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- H02J7/0091—
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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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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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a dual multi-stage power limiting protection system based on a frequency modulation energy storage system, which comprises: the battery box system layer comprises a plurality of battery box systems, each battery box system comprises a plurality of battery management systems, the battery management system BMSij acquires battery parameters, the battery parameters comprise SOCij, the battery management system BMSij determines a target alarm and acquires and executes a preset alarm power limiting strategy corresponding to the target alarm; the medium-voltage box system layer comprises a plurality of medium-voltage box systems, and each medium-voltage box system comprises a plurality of energy storage converters and a centralized control device; the energy storage monitoring system layer comprises an energy storage monitoring system; the preset power limit handling strategy is executed when the SOC exceeds a1, or when the SOC does not exceed a1 and SOCi exceeds a2, or when SOCi does not exceed a2 and SOCij exceeds A3, or when SOCij does not exceed A3 and SOCij exceeds a 4.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a dual multi-level power limiting protection system based on a frequency modulation energy storage system.
Background
In the existing frequency modulation energy storage system, during the process of performing frequent and repeated charging and discharging operations on the cell stack of the cell management system, especially at the final stage of full charge or emptying in the charging and discharging process, the change rate of the cell parameters of the cell stack in the cell management system is very fast, such as: the voltage change rate is very fast, therefore, overvoltage or undervoltage, overcurrent and the like are easy to occur.
In order to avoid the situation that the cell stack is under overvoltage, undervoltage or overcurrent, the cell stack needs to be protected. The existing protection strategies are: when the battery stack has the conditions of overvoltage, undervoltage or overcurrent and the like, the operation of automatic brake breaking is executed, so that the effect of protecting the battery stack is achieved.
However, after the cell stack is switched off, a maintenance worker needs to perform operations such as analyzing, maintaining and confirming safety of the whole frequency modulation energy storage system to perform switching-on operation, so that the technical problems of long maintenance time and high maintenance labor cost exist.
Disclosure of Invention
The invention aims to provide a double multistage power limiting protection system based on a frequency modulation energy storage system, and aims to solve the technical problems of long maintenance time, high maintenance cost and easiness in brake breaking of the conventional frequency modulation energy storage system.
In order to solve the above problems, the present invention provides a dual multi-stage power limiting protection system based on a frequency modulation energy storage system, which includes:
the battery box system layer comprises a plurality of battery box systems, each battery box system comprises a plurality of battery management systems, the battery management systems BMSij acquire battery parameters including SOCij, the battery management systems BMSij determine target alarm levels corresponding to the battery parameters in a plurality of preset alarm levels, confirm target alarms in the preset alarms of the target alarm levels, acquire preset alarm power limiting strategies corresponding to the target alarms, and execute the preset alarm power limiting strategies, wherein i is more than or equal to 1 and less than or equal to M, i is more than or equal to 1 and less than or equal to N, M is the number of the battery box systems, N is the number of the battery management systems BMSs in the ith battery box system, and SOC threshold ranges corresponding to the battery management systems BMSij are A4(BMS _ min, BMS _ max);
the medium-voltage box system layer comprises a plurality of medium-voltage box systems, each medium-voltage box system comprises a plurality of energy storage converters and a centralized control device, the centralized control device is respectively connected with each energy storage converter, and each energy storage converter corresponds to one battery management system; the energy storage converter PCSij receives the SOCij sent by the battery management system BMSij, and the centralized control equipment KQi calculates the SOCi according to the SOCij; the SOC threshold range corresponding to the energy storage converter PCsij is A3(PCS _ min, PCS _ max), and the SOC threshold range corresponding to the centralized control equipment KQi is A2(KQ _ min, KQ _ max);
the energy storage monitoring system layer comprises an energy storage monitoring system, the energy storage monitoring system is respectively connected with each centralized control device, the energy storage monitoring system calculates the SOC according to the SOCi, and the SOC threshold range corresponding to the energy storage monitoring system EMS is A1(EMS _ min, EMS _ max), wherein BMS _ min is less than or equal to PCS _ min and less than or equal to KQ _ min and less than or equal to EMS _ min, and BMS _ max is greater than or equal to PCS _ max and greater than or equal to KQ _ max and greater than or equal to EMS _ max; when the energy storage monitoring system EMS judges that the SOC exceeds A1, controlling the M battery box systems to execute a preset power limit processing strategy; when the SOC does not exceed a1 and the centralized control device KQi determines that the SOCi exceeds a2, controlling the ith battery box system to execute a preset power limit processing strategy; when the SOCi does not exceed A2 and the energy storage converter PCsij judges that the SOCij exceeds A3, controlling the battery management system BMSij to execute a preset power limit processing strategy; and when the SOCij does not exceed A3 and the battery management system BMSij judges that the SOCij exceeds A4, controlling the battery management system BMSij to execute a preset power limit processing strategy.
As a further improvement of the invention, the plurality of preset alarm levels comprise an alarm level A, an alarm level B, an alarm level C and an alarm level D, wherein the alarm level A comprises a BMS system insulation alarm, a BMS internal contactor closing state alarm, a BMS internal acquisition calculation management unit communication state alarm, a BMS and PCS communication state alarm, the alarm level B comprises a BMS detected charging and discharging overcurrent alarm and a BMS detected battery voltage alarm, and the alarm level C comprises a BMS detected battery temperature alarm; and the D alarm level comprises a battery balance state alarm detected by the BMS and an internal acquisition unit self-checking state alarm detected by the BMS.
As a further improvement of the present invention, a battery management system includes:
the waiting time confirmation module is used for timing from the current moment and confirming the target preset power limit waiting time corresponding to the target alarm;
and the limiting strategy executing module is used for acquiring a preset alarm power limiting strategy corresponding to the target alarm and executing the preset alarm power limiting strategy when the timing duration reaches the target preset power limiting waiting duration.
As a further improvement of the present invention, the centralized control apparatus includes:
an SOC calculation module for calculating SOCi according to equation (1):
SOCi＝(SOCi1+SOCi2+…+SOCij+…+SOCiN)/N (1)。
as a further improvement of the present invention, the energy storage monitoring system comprises:
an SOC calculation module for calculating SOC according to the formula (2):
SOC＝(SOC1+SOC2+…+SOCi+…SOCM)/M (2)。
as a further improvement of the present invention, the energy storage monitoring system comprises:
the instruction receiving module is used for receiving a power control instruction sent by an upper layer;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the M battery box systems to be 0 and not limiting the discharging power of the M battery box systems if the power control instruction is a charging instruction and the SOC is greater than EMS _ max;
and the discharging limiting module is used for limiting the discharging power of the M battery box systems to be 0 and not limiting the charging power of the M battery box systems if the power control instruction is a discharging instruction and the SOC is less than EMS _ min.
As a further improvement of the present invention, the centralized control apparatus includes:
the receiving module is used for receiving a power control instruction sent by an energy storage monitoring system EMS;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the ith battery box system to be 0 and not limiting the discharging power of the ith battery box system if the power control instruction is a charging instruction and the SOCi is greater than KQ _ max;
and the discharging limiting module is used for limiting the discharging power of the ith battery box system to be 0 and not limiting the charging power of the ith battery box system if the power control instruction is a discharging instruction and the SOCi is less than KQ _ min.
As a further improvement of the invention, the energy storage converter comprises:
a receiving module, configured to receive a power control instruction sent by the centralized control device KQi;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the battery management system BMSij to be 0 and not limiting the discharging power of the battery management system BMSij if the power control command is a charging command and SOCij is greater than PCS _ max;
and the discharging limiting module is used for limiting the discharging power of the battery management system BMSij to be 0 and not limiting the charging power of the battery management system BMSij if the power control command is a discharging command and the SOCij is less than PCS _ min.
As a further improvement of the present invention, a battery management system includes:
the receiving module is used for receiving a power control command sent by the energy storage converter PCSij;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the charging limiting module to be 0 and not limiting the discharging power of the charging limiting module if the power control instruction is a charging instruction and BMS _ SOCij > BMS _ max;
and the discharging limiting module is used for limiting the self discharging power to be 0 and not limiting the self charging power if the power control command is a discharging command and BMS _ SOCij < BMS _ min.
Compared with the prior art, the battery management system disclosed by the invention has the advantages that the hierarchical power limitation in the battery management system is carried out according to the acquired battery parameters, and the energy storage monitoring system, the centralized control equipment, the energy storage converter and the battery management system carry out the multilevel power limitation outside the battery box system, so that a dual multilevel power limitation mechanism of the frequency modulation energy storage system is formed, the probability of overvoltage, undervoltage, overcurrent and the like in the charging and discharging process is reduced, the times of manual maintenance are reduced, the maintenance cost and the times of brake break are reduced, and the operation stability of the frequency modulation energy storage system is improved.
Drawings
FIG. 1 is a schematic diagram of a frame structure of an embodiment of a dual multi-stage power-limiting protection system based on a frequency-modulated energy storage system according to the present invention;
FIG. 2 is a functional block diagram of an embodiment of a battery management system in a dual multi-stage power-limiting protection system based on a frequency-modulated energy storage system according to the present invention;
fig. 3 is a functional block diagram of a centralized control device in the dual multi-stage power limiting protection system based on the frequency modulation energy storage system according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of an embodiment of an energy storage monitoring system in a dual multi-stage power limiting protection system based on a frequency modulation energy storage system according to the present invention;
fig. 5 is a functional block diagram of an embodiment of an energy storage converter in a dual multi-stage power limiting protection system based on a frequency modulation energy storage system according to the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, wherein like reference numerals represent like elements in the drawings. It is apparent that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1-5 illustrate one embodiment of the dual multi-stage power limiting protection system based on a frequency modulated energy storage system of the present invention. In the present embodiment, referring to fig. 1, the dual multi-level power limitation protection system based on the frequency modulation energy storage system includes an AGC control system layer 1, an energy storage monitoring system layer 2, a medium voltage box system layer 3, and a battery box system layer 4.
The battery box system layer 4 includes a plurality of battery box systems, each of which includes a plurality of battery management systems, the battery management system BMSij obtains battery parameters, and the battery parameters include SOCij.
To explain the technical solution of the present invention in more detail, referring to fig. 1, the battery box system layer 4 includes 4 battery box systems, and the 1 st battery box system includes a battery management system BMS1-1, a battery management system BMS1-2, a battery management system BMS1-3, and a battery management system BMS 1-4; ...; the 4 th battery box system includes a battery management system BMS4-1, a battery management system BMS4-2, a battery management system BMS4-3, and a battery management system BMS 4-4.
It should be noted that the battery parameters in this embodiment further include current, voltage, battery temperature, battery equalization state information, and the like.
Further, the battery management system BMSij determines a target alarm level corresponding to the battery parameter in the preset alarm levels, determines a target alarm in the preset alarms of the target alarm level, acquires a preset alarm power limiting strategy corresponding to the target alarm, and executes the preset alarm power limiting strategy, wherein i is greater than or equal to 1 and less than or equal to M, i is greater than or equal to 1 and less than or equal to N, M is the number of battery box systems, N is the number of battery management systems BMS in the ith battery box system, and an SOC threshold range corresponding to the battery management system BMSij is a4(BMS _ min, BMS _ max).
On the basis of the embodiment, in other embodiments, the plurality of preset alarm levels comprise an alarm level A, an alarm level B, an alarm level C and an alarm level D, wherein the alarm level A comprises a BMS system insulation alarm, a BMS internal contactor closing state alarm, a BMS internal acquisition and calculation management unit communication state alarm, a BMS and PCS communication state alarm, the alarm level B comprises a BMS detected charging and discharging overcurrent alarm and a BMS detected battery voltage alarm, and the alarm level C comprises a BMS detected battery temperature alarm; and the alarm grade D comprises a battery balance state alarm detected by the BMS and a self-checking state alarm of an internal acquisition unit detected by the BMS.
On the basis of the present embodiment, in other embodiments, referring to fig. 2, the battery management system includes a waiting duration confirmation module 10 and a restriction policy execution module 11.
The waiting time period confirming module 10 is configured to count time from a current time and confirm a target preset power limit waiting time period corresponding to the target alarm; and the limiting strategy executing module 11 is configured to, when the timing duration reaches a target preset power limiting waiting duration, obtain a preset alarm power limiting strategy corresponding to the target alarm, and execute the preset alarm power limiting strategy.
In the embodiment, after the alarm is confirmed initially, the verification is performed within the preset power limit waiting time, so that the influence on the stable operation of the battery management system caused by the power limit operation according to the collected instant battery parameters (specifically, the instant alarm and the normal rest time) is avoided, and the operation stability of the battery management system is further improved.
Further, the medium voltage box system layer 3 includes a plurality of medium voltage box systems, each medium voltage box system includes a plurality of energy storage converters and a centralized control device, the centralized control device is connected with each energy storage converter, and each energy storage converter corresponds to one battery management system.
For more detailed description of the technical solution of the present invention, referring to fig. 1, the medium voltage box system layer 3 includes 4 medium voltage box systems, specifically, the 1 st medium voltage box system includes a centralized control device KQ1, an energy storage converter PCS1-1, an energy storage converter PCS1-2, an energy storage converter PCS1-3, and an energy storage converter PCS 1-4; ...; the 4 th medium-voltage box system comprises a centralized control device KQ4, an energy storage converter PCS4-1, an energy storage converter PCS4-2, an energy storage converter PCS4-3 and an energy storage converter PCS 4-4.
Further, the energy storage converter PCSij receives SOCij sent by the battery management system BMSij, and the centralized control device KQi calculates according to SOCij to obtain SOCi; the SOC threshold range corresponding to the energy storage converter PCsij is A3(PCS _ min, PCS _ max), and the SOC threshold range corresponding to the centralized control device KQi is A2(KQ _ min, KQ _ max).
On the basis of the present embodiment, in other embodiments, referring to fig. 3, the centralized control device KQi includes an SOC calculation module 20. The SOC calculation module 20 is configured to calculate SOCi according to the formula (1):
SOCi＝(SOCi1+SOCi2+…+SOCij+…+SOCiN)/N (1)。
specifically, it is assumed that the 1 st battery box system includes a battery management system BMS1-1, an SOC value corresponding to the battery management system BMS1-1 is SOC11, a battery management system BMS1-2, an SOC value corresponding to the battery management system BMS1-2 is SOC12, a battery management system BMS1-3, an SOC value corresponding to the battery management system BMS1-3 is SOC13, a battery management system BMS1-4, and an SOC value corresponding to the battery management system BMS1-4 is SOC 14.
SOC1 is (SOC11+ SOC12+ SOC13+ SOC 14)/4.
Further, the energy storage monitoring system layer 2 includes an energy storage monitoring system, the energy storage monitoring system is respectively connected with each centralized control device, the energy storage monitoring system calculates the SOC according to the SOCi, and the SOC threshold range corresponding to the energy storage monitoring system EMS is a1(EMS _ min, EMS _ max), wherein BMS _ min is not less than PCS _ min is not less than KQ _ min is not less than EMS _ min, BMS _ max is not less than PCS _ max is not less than KQ _ max is not less than EMS _ max.
On the basis of the present embodiment, in other embodiments, referring to fig. 4, the energy storage monitoring system includes an SOC calculation module 30. The SOC calculating module 30 is configured to calculate the SOC according to the formula (2):
SOC＝(SOC1+SOC2+…+SOCi+…SOCM)/M (2)
specifically, assume that the medium-pressure tank system layer includes a1 st medium-pressure tank system, a2 nd medium-pressure tank system, a3 rd medium-pressure tank system, and a4 th medium-pressure tank system, where SOC corresponding to KQ1 of the 1 st medium-pressure tank system is SOC1, SOC corresponding to KQ1 of the 2 nd medium-pressure tank system is SOC2, SOC corresponding to KQ1 of the 3 rd medium-pressure tank system is SOC3, and SOC corresponding to KQ1 of the 4 th medium-pressure tank system is SOC 4.
Then SOC equals (SOC1+ SOC2+ SOC3+ SOC 4)/4.
Further, when the energy storage monitoring system EMS determines that the SOC exceeds a1, the M battery box systems are controlled to execute a preset power limit processing strategy.
Based on the present embodiment, in other embodiments, referring to fig. 4, the energy storage monitoring system further includes an instruction receiving module 40, a determining module 41, a charging limiting module 42, and a discharging limiting module 43.
The instruction receiving module 40 is configured to receive a power control instruction sent by an upper layer; a judging module 41, configured to judge whether the power control instruction is a charging instruction or a discharging instruction; the charging limiting module 42 is configured to limit the charging power of the M battery box systems to 0 and not limit the discharging power of the M battery box systems if the power control instruction is a charging instruction and the SOC is greater than EMS _ max; and a discharge limiting module 43, configured to limit the discharge power of the M battery box systems to 0 and not limit the charging power of the M battery box systems if the power control command is a discharge command and the SOC is less than EMS _ min.
This embodiment can carry out synchronous power control to whole battery box system layer, and then has promoted power restriction efficiency.
Further, when the SOC does not exceed a1 and the centralized control device KQi determines that the SOCi exceeds a2, the ith battery box system is controlled to execute a preset power limit processing strategy.
On the basis of the present embodiment, in other embodiments, referring to fig. 3, the centralized control device includes a receiving module 50, a judging module 51, a charging limiting module 52 and a discharging limiting module 53.
The receiving module 50 is configured to receive a power control instruction sent by an energy storage monitoring system EMS; a judging module 51, configured to judge whether the power control instruction is a charging instruction or a discharging instruction; a charge limiting module 52, configured to limit the charging power of the ith battery box system to 0 and not limit the discharging power of the ith battery box system if the power control command is a charge command and SOCi > KQ _ max; and a discharge limiting module 53, configured to limit the discharge power of the ith battery box system to 0 and not limit the charging power of the ith battery box system if the power control command is a discharge command and SOCi < KQ _ min.
According to the embodiment, the conditions that overvoltage, overcurrent and the like will occur in a certain battery box system are judged according to the SOC, the power limiting operation is performed on the whole battery box system, and the power limiting efficiency is improved.
Further, when the SOCi does not exceed A2 and the energy storage converter PCsij judges that the SOCij exceeds A3, the battery management system BMSij is controlled to execute a preset power limit processing strategy.
On the basis of the present embodiment, in other embodiments, referring to fig. 5, the energy storage converter includes a receiving module 60, a determining module 61, a charging limiting module 62, and a discharging limiting module 63.
The receiving module 60 is configured to receive a power control instruction sent by the centralized control device KQi; a judging module 61, configured to judge whether the power control instruction is a charging instruction or a discharging instruction; a charging limiting module 62, configured to limit the charging power of the battery management system BMSij to 0 and not limit the discharging power of the battery management system BMSij if the power control command is a charging command and SOCij > PCS _ max; and a discharge limiting module 63, configured to limit the discharge power of the battery management system BMSij to 0 and not limit the charging power of the battery management system BMSij if the power control command is a discharge command and SOCij < PCS _ min.
Further, when the SOCij does not exceed A3 and the battery management system BMSij determines that the SOCij exceeds a4, the battery management system BMSij is controlled to execute a preset power limit processing strategy.
Based on the present embodiment, in other embodiments, referring to fig. 2, the battery management system further includes a receiving module 70, a determining module 71, a charging limiting module 72, and a discharging limiting module 73.
The receiving module 70 is configured to receive a power control command sent by the energy storage converter PCSij; a judging module 71, configured to judge whether the power control instruction is a charging instruction or a discharging instruction; a charging limiting module 72, configured to limit the charging power of the battery to 0 and not limit the discharging power of the battery if the power control command is a charging command and BMS _ SOCij > BMS _ max; and the discharging limiting module 73 is configured to limit the discharging power of the battery to 0 and not limit the charging power of the battery if the power control command is a discharging command and BMS _ SOCij < BMS _ min.
According to the battery management system, the hierarchical power limitation inside the battery management system is carried out according to the acquired battery parameters, the energy storage monitoring system, the centralized control equipment, the energy storage converter and the battery management system carry out the multistage power limitation outside the battery box system, a dual multistage power limitation mechanism of the frequency modulation energy storage system is formed, the charging and discharging process is reduced, the probability of the occurrence of the conditions such as overvoltage, undervoltage and overcurrent is reduced, the times of manual maintenance are reduced, the maintenance cost and the times of switching off are reduced, and the operation stability of the frequency modulation energy storage system is improved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules as required, that is, the internal structure of the mobile terminal is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above detailed description of the embodiments of the present invention is provided as an example, and the present invention is not limited to the above described embodiments. It will be apparent to those skilled in the art that any equivalent modifications or substitutions can be made within the scope of the present invention, and thus, equivalent changes and modifications, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.
Claims (8)
1. A dual multi-stage power limiting protection system based on a frequency modulated energy storage system, comprising:
a battery box system layer, which includes a plurality of battery box systems, each of which includes a plurality of battery management systems BMSij that obtains a battery parameter including SOCij, the battery management system BMSij determining a target alarm level corresponding to the battery parameter among a plurality of preset alarm levels, confirming a target alarm among the plurality of preset alarms of the target alarm level, obtaining a preset alarm power limiting policy corresponding to the target alarm, and executing the preset alarm power limiting policy, where i is greater than or equal to 1 and less than or equal to M, i is greater than or equal to 1 and less than or equal to N, M is the number of battery box systems, N is the number of battery management systems BMS among the ith battery box system, and an SOC threshold range corresponding to the battery management system BMSij is a4(BMS _ min, BMS _ max);
the medium-voltage box system layer comprises a plurality of medium-voltage box systems, each medium-voltage box system comprises a plurality of energy storage converters and a centralized control device, the centralized control device is respectively connected with each energy storage converter, and each energy storage converter corresponds to one battery management system; the energy storage converter PCsij receives the SOCij sent by the battery management system BMSij, and the centralized control equipment KQi calculates the SOCi according to the SOCij; the SOC threshold range corresponding to the energy storage converter PCsij is A3(PCS _ min, PCS _ max), and the SOC threshold range corresponding to the centralized control equipment KQi is A2(KQ _ min, KQ _ max);
the energy storage monitoring system layer comprises an energy storage monitoring system, the energy storage monitoring system is respectively connected with each centralized control device, the energy storage monitoring system calculates the SOC according to the SOCi, and the SOC threshold range corresponding to the energy storage monitoring system EMS is A1(EMS _ min, EMS _ max), wherein BMS _ min is not less than PCS _ min and not more than KQ _ min and not more than EMS _ min, and BMS _ max is not less than PCS _ max and not less than KQ _ max and not less than EMS _ max; when the energy storage monitoring system EMS judges that the SOC exceeds the A1, controlling M battery box systems to execute a preset power limit processing strategy; when the SOC does not exceed the A1 and the centralized control device KQi judges that the SOCi exceeds the A2, controlling the ith battery box system to execute the preset power limit processing strategy; when the SOCi does not exceed the A2 and the energy storage converter PCsij judges that the SOCij exceeds the A3, controlling the battery management system BMSij to execute the preset power limit processing strategy; when the SOCij does not exceed the A3 and the battery management system BMSij judges that the SOCij exceeds the A4, controlling the battery management system BMSij to execute the preset power limit processing strategy;
wherein the battery management system comprises:
the waiting time confirmation module is used for timing from the current moment and confirming the target preset power limit waiting time corresponding to the target alarm;
and the limiting strategy executing module is used for acquiring a preset alarm power limiting strategy corresponding to the target alarm and executing the preset alarm power limiting strategy when the timing duration reaches the target preset power limiting waiting duration.
2. The dual multi-level power limiting protection system based on frequency modulation energy storage system according to claim 1, wherein the plurality of preset alarm levels comprise an alarm level A, an alarm level B, an alarm level C and an alarm level D, wherein the alarm level A comprises an alarm level of BMS system insulation, an alarm level of BMS internal contactor closing state, an alarm level of BMS internal acquisition calculation management unit communication state, and an alarm level BMS and PCS communication state, the alarm level B comprises an alarm level of BMS detected charging and discharging overcurrent, and an alarm level of BMS detected battery voltage, and the alarm level C comprises an alarm level of BMS detected battery temperature; and the D alarm level comprises a battery balance state alarm detected by the BMS and an internal acquisition unit self-checking state alarm detected by the BMS.
3. The dual multi-level power-limiting protection system based on a frequency modulated energy storage system of claim 1, wherein the centralized control device comprises:
an SOC calculation module for calculating SOCi according to equation (1):
SOCi＝(SOCi1+SOCi2+…+SOCij+…+SOCiN)/N (1)。
4. a dual multi-stage power-limiting protection system based on a frequency modulated energy storage system as claimed in claim 1, wherein said energy storage monitoring system comprises:
an SOC calculation module for calculating SOC according to the formula (2):
SOC＝(SOC1+SOC2+…+SOCi+…SOCM)/M (2)。
5. a dual multi-stage power-limiting protection system based on a frequency modulated energy storage system as claimed in claim 1, wherein said energy storage monitoring system comprises:
the instruction receiving module is used for receiving a power control instruction sent by an upper layer;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the M battery box systems to be 0 and not limiting the discharging power of the M battery box systems if the power control instruction is the charging instruction and the SOC is greater than EMS _ max;
and the discharging limiting module is used for limiting the discharging power of the M battery box systems to be 0 and not limiting the charging power of the M battery box systems if the power control instruction is the discharging instruction and the SOC is less than EMS _ min.
6. The dual multi-level power-limiting protection system based on a frequency modulated energy storage system of claim 1, wherein the centralized control device comprises:
the receiving module is used for receiving a power control instruction sent by the energy storage monitoring system EMS;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
a charging limiting module, configured to limit the charging power of the ith battery box system to 0 and not limit the discharging power of the ith battery box system if the power control instruction is the charging instruction and SOCi > KQ _ max;
and the discharging limiting module is used for limiting the discharging power of the ith battery box system to be 0 and not limiting the charging power of the ith battery box system if the power control instruction is the discharging instruction and SOCi is less than KQ _ min.
7. The dual multi-stage power-limiting protection system based on a frequency modulated energy storage system of claim 1, wherein said energy storage converter comprises:
a receiving module, configured to receive a power control instruction sent by the centralized control device KQi;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the battery management system BMSij to be 0 and not limiting the discharging power of the battery management system BMSij if the power control command is the charging command and SOCij > PCS _ max;
and the discharging limiting module is used for limiting the discharging power of the battery management system BMSij to be 0 and not limiting the charging power of the battery management system BMSij if the power control command is the discharging command and SOCij is less than PCS _ min.
8. The dual multi-level power-limiting protection system based on a frequency modulated energy storage system of claim 1, wherein the battery management system comprises:
the receiving module is used for receiving a power control command sent by the energy storage converter PCSij;
the judging module is used for judging whether the power control instruction is a charging instruction or a discharging instruction;
the charging limiting module is used for limiting the charging power of the charging limiting module to be 0 and not limiting the discharging power of the charging limiting module if the power control command is the charging command and BMS _ SOCij > BMS _ max;
and the discharging limiting module is used for limiting the self discharging power to be 0 and not limiting the self charging power if the power control command is the discharging command and BMS _ SOCij < BMS _ min.
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