CN111541275A - Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system - Google Patents

Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system Download PDF

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Publication number
CN111541275A
CN111541275A CN202010484835.4A CN202010484835A CN111541275A CN 111541275 A CN111541275 A CN 111541275A CN 202010484835 A CN202010484835 A CN 202010484835A CN 111541275 A CN111541275 A CN 111541275A
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unit
flexible
battery module
power
bms
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陈世锋
张建兴
徐红刚
马帅
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Nanjing Mit Energy Technology Co ltd
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Nanjing Mit Energy Technology Co ltd
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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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • 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
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • 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
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14—Energy storage units
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a distributed energy storage system-based multi-parameter dynamic adjustment flexible charge and discharge control system, which comprises an isolation transformer, a flexible control unit, a plurality of BMS units, a plurality of AC/DC units, a plurality of battery modules and a background server, wherein: the battery modules are arranged in parallel, the battery modules, the BMS units and the AC/DC units are arranged in series, the BMS units, the AC/DC units and the battery modules are arranged in one-to-one correspondence, and the BMS units and the AC/DC units are arranged in series.

Description

Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to a flexible charging and discharging control system based on distributed energy storage system multi-parameter dynamic adjustment.
Background
With the continuous improvement of the economy of the energy storage technology, the role of energy storage in renewable energy power generation, smart power grids and energy internet construction is increasingly prominent, and China also has a policy in succession to encourage the construction and application of the energy storage technology. According to different access modes and application scenes, the application of the energy storage system mainly comprises a centralized mode and a distributed mode. The energy storage system for centralized application is generally accessed in the same grid-connected point in a centralized way, at present, the form is mainly adopted in the aspects of large-scale renewable energy power generation grid connection, power grid auxiliary service and the like, and the energy storage system has the characteristics of large power (several megawatts to hundreds of megawatts), long discharge duration (minutes to hours) and the like. The distributed energy storage system is flexible in access position and is mainly applied to medium and low voltage power distribution networks, distributed power generation and micro-grids and user sides at present. The scale of the power and capacity of the distributed energy storage is relatively small.
The distributed energy storage system has the advantages of wide application range, and has several characteristics:
1. the energy storage medium is diversified, such as lithium iron phosphate, ternary, lead-acid, sodium-sulfur batteries, flow batteries, super capacitors and the like, the voltage platforms of the batteries are different, and the same battery has different capacities;
2. distributed energy storage is mostly in a modular design and is managed by multiple branches, and the control in different energy storage media is relatively complex;
3. there are typically multiple distributed energy storage systems and multiple branch situations in a single energy storage system.
In view of the above three situations, a distributed energy storage control system is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a flexible charging and discharging control system based on multi-parameter dynamic adjustment of a distributed energy storage system, so as to solve the technical problem.
In order to achieve the purpose, the invention provides the following technical scheme: based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment, including isolation transformer, flexible control unit, a plurality of BMS unit, a plurality of AC/DC unit, a plurality of battery module and backend server, wherein:
the battery modules are arranged in parallel, and the battery modules, the BMS unit and the AC/DC unit are arranged in series;
the BMS units, the AC/DC units and the battery modules are arranged in a one-to-one correspondence manner, and the BMS units and the AC/DC units are mutually connected in series;
the BMS unit and the AC/DC unit are electrically connected with the flexible control unit, and the flexible control unit can be communicated with the background server through wires and/or wirelessly;
the flexible control unit is connected with the isolation transformer through a cable, the flexible control unit is connected to an external power grid through the isolation transformer, and the isolation transformer can isolate and match voltage;
the BMS unit is used for acquiring state information of the corresponding battery module, and the AC/DC unit switches charging/discharging of the battery module;
the flexible control unit can collect the battery module state information and the AC/DC unit state information collected by the BMS unit and transmit the battery module state information and the AC/DC unit state information to the background server;
the background server carries out flexible charging and discharging power distribution on the battery module according to the transmission information of the flexible control unit, the background server can send flexible charging and discharging power distribution results to the flexible control unit in a wired and/or wireless mode, and the flexible control unit carries out flexible charging and discharging on the battery module according to the flexible charging and discharging power distribution results.
Preferably, a bus type network topology structure is adopted among the flexible control unit, the BMS unit and the AC/DC unit, and the bus type network topology structure comprises RS232, RS485, CAN and Devicenet.
Preferably, the state information of the battery module collected by the BMS unit includes an absolute value of a capacity of the battery, an open-circuit voltage value of the battery, an internal resistance value of the battery, and a self-discharge value of the battery.
Preferably, the AC/DC unit status information collected by the BMS unit includes a rated power of the AC/DC unit, a current-time power of the AC/DC unit, a remaining discharging power of an nth AC/DC unit, a remaining charging power of an nth AC/DC unit, a charging power allowed by the nth AC/DC unit, and a discharging power allowed by the nth AC/DC unit.
Preferably, the specification capacities of the plurality of battery modules are different from each other, and the specifications of the plurality of AC/DC units are different from each other.
Preferably, a CPU capable of processing information transmitted by the flexible control unit is arranged in the background server, and the CPU is TMS320F 2812.
Preferably, the step of dynamically adjusting the flexible charging and discharging power comprises:
step one, modeling equipment and defining variables;
secondly, performing online identification on the AC/DC unit and the battery module;
step three, carrying out logic processing according to the AC/DC unit and the battery module information obtained in the step two to obtain an identification code of equipment effectiveness, specifically Sn total＝SnPCS&SnBAT；
And step four, dynamically adjusting the control strategy according to the identity state identification code obtained in the step three and by algorithm real-time calculation.
The invention has the technical effects and advantages that: the distributed energy storage system multi-parameter dynamic adjustment flexible charging and discharging control system comprises:
1. the invention realizes the flexible power control strategy of the batteries with different specifications of AC/DC units and different specifications of capacities, and solves the problems of the prior average power distribution and single power ratio distribution;
2. the algorithm can circularly update data in real time, and can realize dynamic adjustment of strategies;
3. the invention can be extended to the cluster control of a plurality of different types of distributed energy storage, and provides a solution for the cluster control of the plurality of different types of distributed energy storage.
Drawings
FIG. 1 is a circuit topology of the present invention;
FIG. 2 is a flow chart of the flexible control unit for loop function according to the present invention.
In the figure: 1-isolation transformer, 2-flexible control unit, 3-BMS unit, 4-AC/DC unit, 5-battery module and 6-background server.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1-2 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system as shown in fig. 1-2, which comprises an isolation transformer 1, a flexible control unit 2, a plurality of BMS units 3, a plurality of AC/DC units 4, a plurality of battery modules 5 and a background server 6, wherein:
the battery modules 5 are arranged in parallel, when the battery modules 5 of the high-voltage direct-current system are charged, each battery module 5 connected in series is charged, the charging voltage of some battery modules 5 is higher than that of other battery modules 5 due to the fact that the performances of the battery modules 5 are slightly different, the battery modules 5 are aged in advance, as long as the performances of one battery module 5 connected in series are reduced, the performances of all the battery modules 5 are reduced, tests prove that the service life of the battery is related to the number of the battery modules 5 connected in series, and the higher the voltage of the battery module 5 is, the faster the battery module 5 is aged.
The battery module 5, the BMS unit 3 and the AC/DC unit 4 are connected in series, the BMS unit 3 adopts a passive equalization technology, and can simultaneously perform discharge equalization on the corresponding battery module 5, so that the consistency of the battery is improved, and the service life of the battery is prolonged.
When the battery module 5 has one or more faults, for example, the temperature of the battery module 5 is too high or too low, the battery module 5 is over-voltage or under-voltage, the battery module 5 is over-current or under-voltage, and the battery module 5 is over-current or short-circuit in charging/discharging, the BMS unit 3 can cut off the battery module 5 with the faults, so that the battery module 5 can be effectively protected, and the power utilization safety is improved.
The AC/DC unit 4 can convert the AC power input by the external power grid into DC power and output the DC power to the battery module 5 or convert the DC power output by the battery module 5 into AC power and output the AC power to the external power grid according to the scheduling instruction issued by the flexible control unit 2.
The BMS units 3, the AC/DC units 4, and the battery modules 5 are disposed in one-to-one correspondence, and the BMS units 3 and the AC/DC units 4 are disposed in series with each other;
the BMS unit 3 and the AC/DC unit 4 are electrically connected to the flexible control unit 2, and the flexible control unit 2 can communicate with the background server 6 by wire and/or wirelessly;
the flexible control unit 2 is connected with the isolation transformer 1 through a cable, the flexible control unit 2 is connected to an external power grid through the isolation transformer 1, and the isolation transformer 1 can isolate and match voltage;
the BMS unit 3 is used to collect state information of the corresponding battery module 5, and the AC/DC unit 4 switches charging/discharging of the battery module 5;
the flexible control unit 2 can collect the state information of the battery module 5 and the state information of the AC/DC unit 4 collected by the BMS unit 3 and transmit the state information to the background server 6;
the background server 6 distributes the flexible charging and discharging power of the battery module 5 according to the information transmitted by the flexible control unit 2, the background server 6 can send the flexible charging and discharging power distribution result to the flexible control unit 2 in a wired and/or wireless mode, and the flexible control unit 2 flexibly charges and discharges the battery module 5 according to the flexible charging and discharging power distribution result.
Specifically, a bus type network topology structure is adopted among the flexible control unit 2, the BMS unit 3 and the AC/DC unit 4, and real-time and non-real-time data are separately transmitted, so that communication of the upper-level control BMS unit 3 of the flexible control unit 2 is realized.
The bus type network topology mode comprises RS232, RS485, CAN and Devicenet, through the adoption of the bus type network topology structure, additional interconnection equipment is not needed, the bus type network topology structure CAN be directly connected through a bus, networking cost is low, through the adoption of the bus type network topology structure, expansion is flexible, only one connector needs to be added when expansion is needed, the bus type network topology structure is easy to maintain, and normal communication of the whole network is not affected due to the fact that a single node (each computer, each concentrator and other equipment CAN be regarded as a node) fails.
Specifically, the state information of the battery module 5 collected by the BMS unit 3 includes an absolute value of a battery capacity, an open-circuit voltage value of the battery, an internal resistance value of the battery, and a self-discharge value of the battery.
Specifically, the state information of the AC/DC unit 4 collected by the BMS unit 3 includes a rated power of the AC/DC unit 4, a current time power of the AC/DC unit 4, a residual discharge power of an nth AC/DC unit 4, a residual charge power of the nth AC/DC unit 4, a charge power that the nth AC/DC unit 4 can also allow, and a discharge power that the nth AC/DC unit 4 can also allow.
Specifically, the specification capacities of the plurality of battery modules 5 are different, the specifications of the plurality of AC/DC units 4 are different, the AC/DC units 4 under the multiple branches may not be of uniform type specifications, and the battery modules 5 are also different from each other.
Specifically, a CPU capable of processing information transmitted by the flexible control unit 2 is arranged in the background server 6, the CPU is TMS320F2812, and the CPU has 128Kx16 Flash and 18Kx16 SRAM.
Specifically, the dynamic adjustment step of the flexible charge and discharge power comprises the following steps:
step one, modeling equipment and defining variables, wherein,
Pn_everfor the nth AC/DC unit 4 to be power rated,
Pn_currfor the current moment power of the nth AC/DC unit 4,
Pn_rem_dischargethe discharge power remains for the nth AC/DC unit 4,
Pn_rem_chargecharging power is left for the nth AC/DC unit 4,
Pn_rem_BAT_chargefor the allowable charging power of the nth battery module 5,
Pn_rem_BAT_dischargethe discharge power that can be allowed for the nth battery module 5,
Sgeneral assembly＝[S1 Total，S2 Total，。。。Sn total]The state combination of the whole system is realized,
SPCS＝[S1_PCS，S2_PCS,。。。Sn_PCS]for the AC/DC unit 4 state combination,
SBAT＝[S1_BAT，S2_BAT,。。。Sn_BAT]for the state combination of the battery module 5,
Sn_PCS(BAT)＝[T1，T2，T3]wherein T is1Is 0: off-line; t is1Is 1 online, T2Is 0: a failure; t is2Is 1 Normal, T3Is 0: stopping the machine; t is3Is 1: running;
and Sn_PCS、Sn_BATReference Sn totalThe mode is defined.
Secondly, performing online identification on the AC/DC unit 4 and the battery module 5;
the AC/DC unit 4 is identified online by,
1) judging whether the communication of the AC/DC unit 4 is normal or not, setting the T1 of the AC/DC unit 4 as 1 if the communication is normal, and setting the T1 of the AC/DC unit 4 as 0 if the communication is not normal;
2) the flexible control unit 2 establishes a for-loop function, and circularly judges the online state, the fault state and the running state of the AC/DC unit 4 from 1 to n, if the online state, the fault state and the running state are normal, the corresponding T is used1，T2，T3Set to 1, otherwiseWill correspond to T1，T2，T3Setting to be 0;
if the 3 rd AC/DC unit 4 is off-line, the fault state is 0, the operation state is 1, and the corresponding effective state value of the equipment is S3_PCS＝[0,0,1]Thus, a 4-state combination of the 3 rd AC/DC unit is obtained;
the online identification method of the battery module 5 is that,
1) judging whether the communication of the battery module 5 is normal or not, setting the T1 of the battery module 5 to be 1 if the communication is normal, and setting the T1 of the battery module 5 to be 0 if the communication is not normal;
2) the flexible control unit 2 establishes a for-loop function, and judges the online state, the fault state and the running state of the battery module 5 from 1 to n loops, if the online state, the fault state and the running state are normal, the corresponding T is used1，T2，T3Setting to 1, otherwise corresponding T1，T2，T3Setting to be 0;
if the first battery module 5 is off-line, the fault status is 0, the operation status is 1, and the corresponding valid status value of the device is SBAT＝[0,0,1]Thus, the 3 rd battery module 5 state combination is obtained.
Step three, carrying out logic processing according to the information of the AC/DC unit 4 and the battery module 5 obtained in the step two to obtain an identification code of equipment effectiveness, specifically Sn total＝SnPCS&SnBAT，
Furthermore, at this time, the total state combination variable obtained from each battery module 5 and the AC/DC unit 4 is calculated next, taking the first battery module 5 and the AC/DC unit 4 corresponding to the first battery module 5 as an example, T1，T2，T3If the value is 1, the battery module 5 id is set to 1, and if any value is 0, the battery module 5 id is set to 0.
Step four, according to the identification code of the identity state obtained in the step three, and by algorithm real-time calculation, the dynamic adjustment of the control strategy is realized, specifically,
according to the identification code corresponding to a certain battery module 5 obtained in the third step,
the effective total rated power is calculated according to the following formula,
Figure BDA0002518757560000091
the effective current active power value is calculated according to the following equation,
Figure BDA0002518757560000092
wherein: p>0 is discharge, P<0 is charging;
the effective remaining charging capacity of the corresponding AC/DC unit 4 is calculated according to the following formula,
if Pcurr＞0,Pn_rem_discharge＝Pn_ever-Pn_curr；Pn_rem_charge＝Rn_ever；
If Pcurr＜0，Pn_rem_discharge＝Pn_ever；Pn_rem_charge＝Pn_ever+Pn_curr；
The effective remaining charge and discharge capacity of the corresponding AC/DC unit 4 is calculated according to the following formula,
Figure BDA0002518757560000101
Figure BDA0002518757560000102
the effective charging power and discharging power allowed by the battery module 5 are calculated according to the following equations,
Figure BDA0002518757560000103
Figure BDA0002518757560000104
after the above calculation is completed, the flexible strategy is analyzed, and the following conditions are provided:
assuming that a power instruction issued by a monitoring system is P;
1) firstly, determining the rationality of the power instruction,
when P is present>0, discharge, when P > min (P)rem_BAT_discharge，Prem_discharge) When P is min (P)rem_BAT_discharge，Prem_discharge) Ensuring that the total power command issue does not exceed the total effective power of the whole system; p is less than or equal to min (P)rem_BAT_discharge，Prem_discharge) The power command is not changed at this time;
when P is present<0, then charging, when P<max((Prem_BAT_charge，Prem_charge) When P is max ((P))rem_BAT_charge，Prem_charge) When P is not less than max ((P)rem_BAT_charge，Prem_charge) At this time), the power command is not changed.
2) And flexible allocation of the power commands is carried out,
when P is present>At 0, when discharging, each AC/DC unit 4 gets a power command of
Figure BDA0002518757560000111
Because the power instructions of each branch are different and the capacities of the energy storage media are different, power distribution cannot be performed only by referring to the power ratio of the AC/DC unit 4 or the battery module 5, comprehensive comparison needs to be performed by comprehensively considering the processing capacity of the AC/DC unit 4 and the processing capacity of the battery module 5, and a small value between the two values is taken for ensuring safety;
when P is present<At 0, at this time, charging is performed, and the power command obtained by each battery module 5 is
Figure BDA0002518757560000112
Because the power instructions of each branch are different and the capacities of the energy storage media are different, power distribution cannot be performed only by referring to the power ratio of the AC/DC unit 4 or the battery module 5, comprehensive comparison needs to be performed by comprehensively considering the processing capacity of the AC/DC unit 4 and the processing capacity of the battery module 5, and a small value between the two values is taken for ensuring safety;
3) because the ratio is not a uniform reference variable in the power distribution mode, although each branch is ensured not to exceed the capacity range, a control error exists, secondary distribution of power is required, the secondary distribution is mainly a reference power ratio,
P>at 0, when discharging, each AC/DC unit 4 gets a power command of
Figure BDA0002518757560000113
P>At 0, when discharging, each AC/DC unit 4 gets a power command of
Figure BDA0002518757560000114
In conclusion, the algorithm is executed in the interruption, the calculation of the algorithm is carried out at regular time, and when a certain AC/DC unit 4 or a certain battery has faults, is disconnected, is communicated, has insufficient residual capacity, reaches full power and the like, the S is calculated in real time according to the algorithmn total，Pever，Pcurr，Pn_rem_discharge，Pn_rem_charge，P，PnAnd waiting for variable information to realize dynamic adjustment of the control strategy.
The existing distributed energy storage multi-branch control strategies are roughly as follows:
1) topologically, under the same converter, the multiple AC/DC units 4 are all in a uniform type specification;
2) the multi-branch AC/DC units 4 are of a uniform type specification, and are generally distributed according to average power during energy distribution, for example, 200kW PCS, 4 50kW module AC/DC units 4 are shared, and when the power instruction value is 100kW, 25kW is distributed to each AC/DC unit 4 according to average distribution;
3) when the battery modules 5 are distributed in proportion, the capacity of the battery module 5 is only required to be considered, that is, the power allowed by the nth battery module 5 is divided by the sum of the powers allowed by all the battery modules 5 to obtain a proportion, and the power fixed value is multiplied by the proportion coefficient to obtain the power distribution instruction of the nth battery module 5.
The difference between the present invention and the existing distributed energy storage multi-branch control strategy is that:
based on different topologies, the multi-branch AC/DC unit 4 is not in a uniform model specification, and the capacities of the battery modules 5 are different, so that the power cannot meet the requirements according to an average power method and a single power ratio method.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (7)

1. Based on flexible charge-discharge control system of distributed energy storage system multi-parameter dynamic adjustment, including isolation transformer (1), flexible control unit (2), a plurality of BMS unit (3), a plurality of AC/DC unit (4), a plurality of battery module (5) and backend server (6), its characterized in that:
the plurality of battery modules (5) are arranged in parallel with each other, and the battery modules (5) are arranged in series with the BMS unit (3) and the AC/DC unit (4);
the BMS units (3), the AC/DC units (4) and the battery modules (5) are arranged in a one-to-one correspondence manner, and the BMS units (3) and the AC/DC units (4) are mutually connected in series;
the BMS unit (3) and the AC/DC unit (4) are electrically connected with the flexible control unit (2), and the flexible control unit (2) can be communicated with the background server (6) through wires and/or wirelessly;
the flexible control unit (2) is connected with the isolation transformer (1) through a cable, the flexible control unit (2) is connected to an external power grid through the isolation transformer (1), and the isolation transformer (1) can isolate and match voltage;
the BMS unit (3) is used for acquiring state information of the corresponding battery module (5), and the AC/DC unit (4) switches charging/discharging of the battery module (5);
the flexible control unit (2) can collect and transmit the state information of the battery module (5) and the state information of the AC/DC unit (4) collected by the BMS unit (3) to the background server (6);
the background server (6) carries out flexible charging and discharging power distribution on the battery module (5) according to the transmission information of the flexible control unit (2), the background server (6) can send flexible charging and discharging power distribution results to the flexible control unit (2) in a wired and/or wireless mode, and the flexible control unit (2) carries out flexible charging and discharging on the battery module (5) according to the flexible charging and discharging power distribution results.
2. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: and bus type network topological structures are adopted among the flexible control unit (2), the BMS unit (3) and the AC/DC unit (4), and the bus type network topological modes comprise RS232, RS485, CAN and Devicenet.
3. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the state information of the battery module (5) collected by the BMS unit (3) comprises a battery capacity absolute value, an open-circuit voltage value of the battery, an internal resistance value of the battery and a self-discharge value of the battery.
4. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the state information of the AC/DC unit (4) collected by the BMS unit (3) comprises rated power of the AC/DC unit (4), power of the AC/DC unit (4) at the current moment, residual discharge power of the nth AC/DC unit (4), residual charge power of the nth AC/DC unit (4), allowable charge power of the nth AC/DC unit (4) and allowable discharge power of the nth AC/DC unit (4).
5. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the specification and capacity of the battery modules (5) are different, and the specification of the AC/DC units (4) is different.
6. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, characterized in that: the background server (6) is internally provided with a CPU which can process the information transmitted by the flexible control unit (2), and the CPU is TMS320F 2812.
7. The distributed energy storage system multi-parameter dynamic adjustment-based flexible charge and discharge control system according to claim 1, wherein the flexible charge and discharge power dynamic adjustment step is as follows:
step one, modeling equipment and defining variables;
secondly, performing online identification on the AC/DC unit (4) and the battery module (5);
step three, carrying out logic processing according to the information of the AC/DC unit (4) and the battery module (5) obtained in the step two to obtain an identification code of equipment effectiveness, specifically Sn total＝SnPCS&SnBAT；
And step four, dynamically adjusting the control strategy according to the identity state identification code obtained in the step three and by algorithm real-time calculation.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117439270A (en) * 2023-10-31 2024-01-23 广东首航智慧新能源科技有限公司 Energy storage monitoring system and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117439270A (en) * 2023-10-31 2024-01-23 广东首航智慧新能源科技有限公司 Energy storage monitoring system and control method thereof

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