CN113178928A - Charge-discharge current control method of parallel battery energy storage system - Google Patents
Charge-discharge current control method of parallel battery energy storage system Download PDFInfo
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- CN113178928A CN113178928A CN202110543992.2A CN202110543992A CN113178928A CN 113178928 A CN113178928 A CN 113178928A CN 202110543992 A CN202110543992 A CN 202110543992A CN 113178928 A CN113178928 A CN 113178928A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 36
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 210000004027 cell Anatomy 0.000 description 41
- 238000010248 power generation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 210000000352 storage cell Anatomy 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The invention discloses a charge-discharge current control method of a parallel battery energy storage system, which comprises the steps of calibrating the serial numbers of a plurality of battery pile energy storage systems which are running in parallel in the energy storage system, and respectively receiving system parameter information flows of each battery pile energy storage system; calculating the total reference value of charging and discharging currents of the battery pile energy storage system required for maintaining the power balance of the power grid bus system
Calculating the average charge-discharge current reference value
(ii) a Calculating stack state of charge for each stack energy storage system
And terminal voltage
Calculating stack state of charge average of stack energy storage system
Calculating the average value of the terminal voltage of the battery stack energy storage system
According to
And
calculating the charging and discharging current deviation of each cell stack
(ii) a Calculating the actual charging and discharging current reference value of each cell stack energy storage system
(ii) a The main control unit controls the charging and discharging current of each cell stack energy storage system; the method has the advantages of prolonging the service life of the cell stack, ensuring good performance of the cell stack and the like.
Description
Technical Field
The invention relates to the technical field of parallel battery stack charging and discharging current control, in particular to a charging and discharging current control method of a parallel battery energy storage system.
Background
The energy storage power station is a necessary supporting product in applications such as smart grids, renewable energy access, distributed power generation, micro grids, electric vehicles and the like. The system can effectively realize the energy management of the required system, eliminate the peak-valley difference between day and night and smooth fluctuation, improve the operation efficiency of power equipment and reduce the power supply cost; the method can also be used as an effective means for promoting the application of renewable energy sources, improving the operation stability of a power grid, adjusting the frequency and compensating the load fluctuation. With the development of new energy power generation technology and the increasing of retired energy storage batteries of electric vehicles, energy storage power stations are more concerned.
Storage capacity of each battery in energy storage power stationMay be determined by the state of charge of each stack ((S))SOC) To make a judgment thatSOCA large cell stack has a large storage capacity, whereas a small storage capacity. Therefore, during the charging process,SOClarge stack charging current less thanSOCSmall stack charging current; in the course of the discharge, the discharge is carried out,SOClarge battery stack current is greater thanSOCSmall cells stack the electrical current. This results in each energy storage cell stackSOCThe balance is approached, and the service life of the cell stack is prolonged. However, the capacity and performance of the stack are also limited by various factors such as the use environment and the number of cycles. For example, initiallySOCThe same performance poor stack may not be achievedSOCThe balancing may be done fully (terminal voltage reaches the highest allowed value) or fully (terminal voltage reaches the lowest allowed value). Thus, it is necessary to stop charging or discharging the stack to protect the stack from damage. Therefore, by stack onlySOCThe method of distributing the charging and discharging current is not perfect. The charging and discharging currents of the cell stack in the distributed energy storage system mentioned in the prior documents and patents are basically based onSOCTo be allocated, e.g. on the basis ofSOCVarious droop methods distribute charge and discharge currents.
Therefore, the invention provides a charge-discharge current control method of a parallel battery energy storage system. The above problems are solved.
Disclosure of Invention
The invention aims to solve the technical problem that the existing method for distributing charge and discharge current only by the SOC of a battery stack has errors, so that the invention provides a charge and discharge current control method of a parallel battery energy storage system, which comprises the following steps:
the control method comprises a power grid bus, a parameter information flow bus, a plurality of battery pile energy storage systems and a master control unit, wherein the power grid bus is simultaneously electrically connected with the plurality of battery pile energy storage systems, the plurality of battery pile energy storage systems are simultaneously electrically connected with the parameter information flow bus, the parameter information flow bus is electrically connected with the master control unit, and the charging and discharging current control method comprises the following steps:
serial numbers of a plurality of battery stack energy storage systems running in parallel are calibrated through a master control unit, and the serial numbers are sequentially and respectively calibrated to be 1, 2, 3 and … n;
respectively receiving a system parameter information flow of a 1 st cell stack energy storage system, a system parameter information flow of a 2 nd cell stack energy storage system, … and a system parameter information flow of an nth cell stack energy storage system through a master control unit;
the total control unit is used for calculating the total reference value of the charging and discharging current of the battery pile energy storage system required for maintaining the power balance of the power grid bus system
While calculating the average charge-discharge current reference value
；
Calculating the battery pile charge state of each battery pile energy storage system through the master control unit
And terminal voltage
Calculating the average value of the state of charge of the battery pile energy storage system
Calculating the average value of terminal voltage of the battery pile energy storage system
According to the average value of the state of charge of the energy storage system of the cell stack
And terminal voltage average of stack energy storage system
Calculating the charging and discharging current deviation of each cell stack
；
The actual charging and discharging current reference value of each cell stack energy storage system is calculated through the master control unit
；
And charging and discharging are carried out on each cell stack energy storage system through the master control unit.
Further, the
And said
All are deviation coefficients greater than zero and less than 1.
Further, the
Is greater than the value of
。
Furthermore, the battery energy storage stack system comprises a battery stack, a bidirectional converter and a parameter information detection device, wherein the bidirectional converter is used for connecting the power grid bus and the battery stack, and the parameter information detection device is used for collecting parameter information of the battery stack, integrating the parameter information into a parameter information flow and sending the parameter information flow to a master control unit.
Further, the actual charging and discharging current reference value of each cell stack energy storage system is calculated through the master control unit
The method comprises the following steps:
when the cell stack energy storage system is actually in a discharging state, the reference value of the actual discharging current of each cell stack energy storage system is calculated to be
When the energy storage system of the cell stack is actually chargedWhen the battery is in an electric state, the total control unit calculates the actual charging current reference value of each battery stack energy storage system as
。
Further, the state of charge of each cell stack energy storage system is calculated through the master control unit
And terminal voltage
The method comprises the following steps:
calculating the charge state of each cell stack energy storage system through the master control unit
；
Receiving terminal voltage of each cell stack energy storage system through a master control unit
。
Further, the state of charge of each cell stack energy storage system is calculated through the master control unit
The method comprises the following steps:
Further, the nominal parameters of each of the stack energy storage systems are the same.
The implementation of the invention has the following beneficial effects:
1. the charge-discharge current control method of the parallel battery energy storage system provided by the invention can calculate the SOC average value and the terminal voltage average value of all running battery stacks in real time according to the SOC and the terminal voltage of each battery stack, and dynamically distributes the charge-discharge current of the battery stacks according to the relation between the SOC and the terminal voltage of each battery and the corresponding average value. Therefore, under the condition of considering the terminal voltage of the cell stack, the SOC of each cell stack tends to be balanced as much as possible, the service life of the cell stack is prolonged, the good performance of the cell stack is ensured, and the utilization rate of the cell stack is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings 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 of the 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.
Examples
Referring to the accompanying drawing 1 of the specification, the technical problem to be solved in this embodiment is that there is an error in the existing method for distributing charge and discharge currents only by the SOC of a battery stack, so that a charge and discharge current control method for a parallel battery energy storage system is provided.
The system comprises a power grid bus, a parameter information flow bus, a plurality of cell stack energy storage systems and a master control unit, wherein the power grid bus is simultaneously and electrically connected with the plurality of cell stack energy storage systems;
the charge and discharge current control method comprises the following steps:
serial numbers of the battery stack energy storage systems are calibrated through a master control unit, and are sequentially and respectively calibrated to be 1, 2, 3 and … n;
respectively receiving a system parameter information flow of a 1 st cell stack energy storage system, a system parameter information flow of a 2 nd cell stack energy storage system, … and a system parameter information flow of an nth cell stack energy storage system through a master control unit;
the total control unit is used for calculating the total reference value of the charging and discharging current of the battery pile energy storage system required for maintaining the power balance of the power grid bus system
While calculating the average charge-discharge current reference value
；
Calculating the battery pile charge state of each battery pile energy storage system through the master control unit
And terminal voltage
Calculating the average value of the state of charge of the battery pile energy storage system
Calculating the average value of terminal voltage of the battery pile energy storage system
According to the average value of the state of charge of the energy storage system of the cell stack
And terminal voltage average of stack energy storage system
Calculating the charging and discharging current deviation of each cell stack
；
The actual charging and discharging current reference value of each cell stack energy storage system is calculated through the master control unit
;
And charging and discharging are carried out on each cell stack energy storage system through the master control unit.
The battery energy storage pile system comprises a battery pile, a bidirectional converter and a parameter information detection device, wherein the bidirectional converter is used for connecting a power grid bus and the battery pile, and the parameter information detection device is used for collecting parameter information of the battery pile, integrating the parameter information into a parameter information flow and sending the parameter information flow to a master control unit.
The actual charging and discharging current reference value of each cell stack energy storage system is calculated through the master control unit
The method comprises the following steps:
when the cell stack energy storage system is actually in a discharging state, the reference value of the actual discharging current of each cell stack energy storage system is calculated to be
When the stack energy storage system is actually in a charged state,the total control unit calculates the actual charging current reference value of each cell stack energy storage system as
。
Calculating the charge state of each cell stack energy storage system through the master control unit
And terminal voltage
The method comprises the following steps:
calculating the charge state of each cell stack energy storage system through the master control unit
；
Receiving terminal voltage of each cell stack energy storage system through a master control unit
。
Calculating the charge state of each cell stack energy storage system through the master control unit
The method comprises the following steps:
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A charging and discharging current control method of a parallel battery energy storage system comprises a power grid bus, a parameter information flow bus, a plurality of battery pile energy storage systems and a master control unit, wherein the power grid bus is simultaneously electrically connected with the plurality of battery pile energy storage systems, the plurality of battery pile energy storage systems are simultaneously electrically connected with the parameter information flow bus, and the parameter information flow bus is electrically connected with the master control unit, and the charging and discharging current control method is characterized by comprising the following steps:
serial numbers of a plurality of battery stack energy storage systems running in parallel are calibrated through a master control unit, and the serial numbers are sequentially and respectively calibrated to be 1, 2, 3 and … n;
respectively receiving a system parameter information flow of a 1 st cell stack energy storage system, a system parameter information flow of a 2 nd cell stack energy storage system, … and a system parameter information flow of an nth cell stack energy storage system through a master control unit;
the total control unit is used for calculating the total reference value of the charging and discharging current of the battery pile energy storage system required for maintaining the power balance of the power grid bus system
While calculating the average charge-discharge current reference value
；
Calculating the battery pile charge state of each battery pile energy storage system through the master control unit
And terminal voltage
Calculating stack state of charge average of stack energy storage system
Calculating the average value of the terminal voltage of the battery stack energy storage system
According to the average value of the state of charge of the energy storage system of the cell stack
And terminal voltage average of stack energy storage system
Calculating the charging and discharging current deviation of each cell stack
；
The actual charging and discharging current reference value of each cell stack energy storage system is calculated through the master control unit
；
And the charge and discharge current of each cell stack energy storage system is controlled by the master control unit.
2. The parallel battery energy storage system charge-discharge current control method of claim 1, wherein the parallel battery energy storage system charge-discharge current control method is characterized in that
And said
All are deviation coefficients greater than zero and less than 1.
3. The parallel battery energy storage system charge-discharge current control method of claim 2, wherein the method is characterized in that
Is greater than the value of
。
4. The method for controlling the charging and discharging currents of the parallel battery energy storage systems according to claim 1, wherein the battery stack energy storage system comprises a battery stack, a bidirectional converter and a parameter information detection device, the bidirectional converter is used for connecting the power grid bus and the battery stack, and the parameter information detection device is used for collecting parameter information of the battery stack, integrating the parameter information into a parameter information stream and sending the parameter information stream to a master control unit.
5. The method for controlling the charging and discharging currents of the parallel battery energy storage systems according to claim 1, wherein the reference value of the actual charging and discharging current of each battery stack energy storage system is calculated through the master control unit
The method comprises the following steps:
when the cell stack energy storage system is actually in a discharging state, the reference value of the actual discharging current of each cell stack energy storage system is calculated to be
When the energy storage systems of the cell stacks are actually in a charging state, the reference value of the actual charging current of each energy storage system of the cell stacks is calculated to be
。
6. The method for controlling charging and discharging current of energy storage systems with parallel batteries according to claim 1, wherein the calculation of each battery stack storage through a master control unitSystematic stack state of charge
And terminal voltage
The method comprises the following steps:
calculating the battery pile charge state of each battery pile energy storage system through the master control unit
；
Receiving the stack terminal voltage of each stack energy storage system through a master control unit
。
7. The method for controlling charging and discharging current of parallel battery energy storage systems according to claim 6, wherein the total control unit calculates the state of charge of each battery stack energy storage system
The method comprises the following steps:
8. The method of claim 1, wherein the nominal parameters of each of the stack energy storage systems are the same.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113921922A (en) * | 2021-10-11 | 2022-01-11 | 苏州联胜新能源科技有限公司 | Battery pack parallel management method, using method and management system, sub-packaging subsystem and energy storage system, and electric vehicle |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113921922B (en) * | 2021-10-11 | 2022-06-28 | 苏州联胜新能源科技有限公司 | Battery pack parallel management method, using method and management system, sub-packaging subsystem and energy storage system, and electric vehicle |
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