CN114744699A - Energy storage system parallel battery cluster circulation restraining device, method and medium - Google Patents
Energy storage system parallel battery cluster circulation restraining device, method and medium Download PDFInfo
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- CN114744699A CN114744699A CN202210295332.1A CN202210295332A CN114744699A CN 114744699 A CN114744699 A CN 114744699A CN 202210295332 A CN202210295332 A CN 202210295332A CN 114744699 A CN114744699 A CN 114744699A
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a device, a method and a medium for restraining the circulation of parallel battery clusters of an energy storage system, wherein the method comprises the steps of detecting the output current of the battery clusters and comparing the output current of each battery cluster; when currents among the battery clusters are unbalanced and circulation occurs among the parallel battery clusters, the switching control of the switch tubes in the circulation restraining circuit is adopted to transfer the power of part of parallel circuits to other parallel circuits through the parallel battery cluster output middle buses, so that the balance control of the currents of all the parallel battery clusters is realized, and the circulation is restrained. The method of the invention transfers the power of part of the parallel loops to other parallel loops through the circulation restraining circuit by controlling the switching of the switch tubes in each bidirectional converter at the same time, thereby realizing the balance of the current of each battery cluster and restraining the circulation.
Description
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to a device, a method and a medium for restraining circulation of parallel battery clusters of an energy storage system.
Background
Due to the inconsistency of the batteries in production, manufacturing, working environment and aging degree, the charge state of each battery is inconsistent in the charge-discharge cycle process of the energy storage system. In the prior art, the battery is easy to cause battery pressure difference due to long-term use, charge and discharge, so that the normal work of a battery system is influenced, the passive equalization capacity of the state of charge of the battery is weak, and the battery can only be actively equalized by an external system. Some batteries cannot be directly connected with the equalizer for various reasons, for example, the battery has no equalizer interface or the battery management system has too weak function, and the like, which may limit the active equalization capability of the battery module.
For the parallel battery clusters, in the charging process, a certain battery cluster is fully charged, and other battery clusters are not fully charged, so that in order to avoid overcharging the battery cluster, the other battery clusters cannot be further fully charged; similarly, during the discharging process, there may be a situation that a certain cell cluster has reached the minimum allowable state of charge, and the rest of the cell clusters can still be further discharged, so as to avoid the damage caused by over-discharging of the cell cluster, all the cells connected in parallel and in series will stop discharging continuously. Therefore, the inconsistent performance of the batteries leads to the limitation of the available capacity of the parallel battery clusters, which causes the waste of the configured capacity, and a large amount of circulation current is introduced among the battery clusters, which increases the cost of the energy storage system.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides a device, a method and a medium for restraining the circulation of a parallel battery cluster of an energy storage system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a circulation restraining device for parallel battery clusters of an energy storage system comprises parallel battery clusters, a control sampling circuit and a circulation restraining circuit;
the control sampling circuit is used for detecting the output current of the battery cluster;
the circulating current suppression circuit is used for circulating current suppression.
Further, when part of the battery clusters need to be subjected to state of charge balancing, the output current reference values of the battery clusters are set as the average value of the output currents of different battery clusters;
if the real-time current sampling value of a certain battery cluster is smaller than the current reference value, the polarity of the output voltage of the circulation current suppression circuit is controlled to be positive, so that the current flowing through each battery cluster is increased;
if the real-time current sampling value of a certain battery cluster is larger than the current reference value, the polarity of the output voltage of the circulation current suppression circuit is controlled to be negative, so that the current flowing through each battery cluster is reduced, current balance is promoted, and circulation current is suppressed.
Further, the sampling circuit is controlled to detect the output currents of different battery clusters, the output currents of the different battery clusters are compared, and an average value is obtained; when the difference between the output current of part of the battery clusters and the current average value is within a preset constant range, the circulation suppression circuits corresponding to the battery clusters are locked, and the parallel loops of the circulation suppression circuits do not carry out current balance;
further, when the difference between the output current of a part of the battery clusters and the current average value of the output current is larger and exceeds a preset constant, the load short-circuit switch of the circulation current suppression circuit corresponding to the battery clusters is turned off, and the current of the battery clusters flows through the circulation current suppression circuit to perform current balancing work.
Furthermore, the circulating current suppression circuit is a direct current converter with bidirectional power transmission and bipolar voltage output.
The invention also discloses an energy storage system parallel battery cluster circulation restraining method based on the provided device, which is used for controlling the sampling circuit to detect the output current of the battery clusters and comparing the output currents of the battery clusters; when currents among the battery clusters are unbalanced and circulation occurs among the parallel battery clusters, the switching control of the switch tubes in the circulation restraining circuit is adopted to transfer the power of part of parallel circuits to other parallel circuits through the parallel battery cluster output middle buses, so that the balance control of the currents of all the parallel battery clusters is realized, and the circulation is restrained.
Further, when a certain battery cluster needs to be subjected to state of charge balancing, setting the output current reference value of the battery cluster as the average value of the output currents of different battery clusters; if the real-time current sampling value of a certain battery cluster is smaller than the current reference value, the polarity of the output voltage of the circulating current suppression circuit is controlled to be positive, so that the current flowing through each battery cluster is increased.
Furthermore, if the real-time current sampling value of a certain battery cluster is greater than the current reference value, the polarity of the output voltage of the circulation current suppression circuit is controlled to be negative, so that the current flowing through each battery cluster is reduced, current balance is promoted, and circulation current is suppressed.
Further, after the current balancing process is completed once, the current real-time balancing state of all the battery clusters is re-evaluated, and the battery clusters needing to be balanced are re-balanced until the output currents of all the parallel battery clusters are equal, the load short-circuit switches of the circulating current suppression circuit are all turned on, and the circulating current suppression of the parallel battery clusters is completed.
The invention also comprises a computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method as provided by the invention.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. by simultaneously controlling the switching of the switch tubes in each bidirectional converter, the power of part of the parallel loops is transmitted to other parallel loops through the circulating current suppression circuit, so that the balance of the current of each battery cluster is realized, and the circulating current is suppressed.
2. For the battery clusters which do not need to carry out the circulation suppression, the control circuit can control the on of the load short-circuit switch of the corresponding bidirectional converter to realize the locking of the connected bidirectional converter, and the parallel loop does not carry out the power balance.
3. For the bidirectional converter which is connected into the system for loop current suppression, the voltage fluctuation amplitude of the middle bus capacitor is maintained to be zero by controlling the switching of the switching tube of the bidirectional DC/DC converter, so that the system loss is small and the efficiency is high.
Drawings
FIG. 1 is a schematic circuit diagram of the apparatus of the present invention;
FIG. 2 is a flow chart of the method of the present invention;
fig. 3 is a schematic configuration diagram of the circulating current suppressing circuit in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the invention provides a circulation suppression device for a parallel battery cluster of an energy storage system, which comprises the parallel battery cluster, a circulation suppression circuit and a control sampling circuit;
the control sampling circuit is used for detecting the output current of the battery cluster;
the circulating current suppression circuit is used for circulating current suppression.
The control sampling circuit detects the output currents of different battery clusters, compares the output currents of the different battery clusters and averages the output currents. If the difference between the output current of the a-th battery cluster, the b-th battery cluster, … … and the m-th battery cluster and the current average value is within a small constant range, the circulation suppression circuits corresponding to the battery clusters are locked, and the parallel loops of the circulation suppression circuits do not carry out current balance; on the contrary, if the output current of some battery clusters is greatly different from the average value of the output current and exceeds a specific constant, the load short-circuit switches of the circulation suppression circuits corresponding to the battery clusters are turned off, and the current of the battery clusters flows through the circulation suppression circuits to perform current balancing work.
As shown in fig. 2, when some battery clusters need to be subjected to state of charge equalization, the output current reference values of the battery clusters are set as the average values of the output currents of different battery clusters. If the real-time current sampling value of a certain battery cluster is smaller than the current reference value, the polarity of the output voltage of the circulation current suppression circuit is controlled to be positive, so that the current flowing through each battery cluster is increased; on the contrary, if the real-time current sampling value of a certain battery cluster is larger than the current reference value, the polarity of the output voltage of the circulation current suppression circuit is controlled to be negative, so that the current flowing through each battery cluster is reduced, the current balance is promoted, and the circulation current is suppressed.
And after the current balancing process is finished once, evaluating the current real-time balancing state of all the battery clusters, and balancing the battery clusters needing to be balanced again until the output currents of all the parallel battery clusters are equal, turning on all the load short-circuit switches of the circulating current suppression circuit, and finishing the circulating current suppression of the parallel battery clusters.
As shown in fig. 3, in the present embodiment, the circulating current suppression circuit is configured as a two-stage circuit with a load short-circuit switch, which is composed of a cascade of bridge-type chopper circuits and a bidirectional DC/DC converter, and maintains the stability of the intermediate bus capacitor voltage while realizing bidirectional power transmission.
In another embodiment, a method for suppressing circulating current of parallel battery clusters of an energy storage system based on the above embodiment is provided, which includes controlling a sampling circuit to detect output currents of the battery clusters and comparing the output currents of the battery clusters; when the current imbalance among the battery clusters is found and the circulation current appears among the parallel battery clusters, the power of part of parallel circuits can be transmitted to other parallel circuits through the parallel battery cluster output middle bus by controlling the switching of the switch tube in the circulation current suppression circuit, so that the current equalization control of each parallel battery cluster is realized and the circulation current is suppressed.
In another embodiment, a computer-readable storage medium based on the above embodiments is provided, storing a computer program which, when executed by a processor, implements the method of the above embodiments.
It should also be noted that in this specification, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A circulation restraining device for a parallel battery cluster of an energy storage system is characterized by comprising the parallel battery cluster, a control sampling circuit and a circulation restraining circuit;
the control sampling circuit is used for detecting the output current of the battery cluster;
the circulating current suppression circuit is used for circulating current suppression.
2. The device for restraining the circulation of the parallel battery clusters of the energy storage system according to claim 1, wherein when part of the battery clusters need to be subjected to state of charge equalization, the reference values of the output currents of the battery clusters are set as the average values of the output currents of different battery clusters;
if the real-time current sampling value of a certain battery cluster is smaller than the current reference value, the polarity of the output voltage of the circulating current suppression circuit is controlled to be positive, so that the current flowing through each battery cluster is increased;
if the real-time current sampling value of a certain battery cluster is larger than the current reference value, the polarity of the output voltage of the circulation current suppression circuit is controlled to be negative, so that the current flowing through each battery cluster is reduced, current balance is promoted, and circulation current is suppressed.
3. The method for restraining the circulation of the parallel battery clusters of the energy storage system according to claim 1, wherein the control sampling circuit detects output currents of different battery clusters, compares the output currents of the different battery clusters and averages the output currents; when the difference between the output current of part of the battery clusters and the current average value is within a preset constant range, the circulation suppression circuits corresponding to the battery clusters are locked, and the parallel loops of the battery clusters do not carry out current balance.
4. The device for restraining the circulation of the parallel battery clusters of the energy storage system according to claim 3, wherein when the difference between the output current of a part of the battery clusters and the average current value of the output current is large and exceeds a preset constant, a load short-circuit switch of a circulation restraining circuit corresponding to the battery clusters is turned off, and the current of the battery clusters flows through the circulation restraining circuit to perform current balancing work.
5. The device for restraining the circulation current of the parallel battery clusters of the energy storage system according to claim 1, wherein the circulation current restraining circuit is a direct current converter with bidirectional power transmission and bipolar voltage output.
6. The method for restraining the circulating current of the parallel battery clusters of the energy storage system based on any one of the devices of claims 1-5 is characterized in that a control sampling circuit detects the output currents of the battery clusters and compares the output currents of the battery clusters; when currents among the battery clusters are unbalanced and circulation occurs among the parallel battery clusters, the switching control of the switch tubes in the circulation restraining circuit is adopted to transfer the power of part of parallel circuits to other parallel circuits through the parallel battery cluster output middle buses, so that the balance control of the currents of all the parallel battery clusters is realized, and the circulation is restrained.
7. The method for restraining the circulating current of the parallel battery clusters of the energy storage system according to claim 6, wherein when the state of charge of a certain battery cluster needs to be balanced, the reference value of the output current of the battery cluster is set as the average value of the output currents of different battery clusters; if the real-time current sampling value of a certain battery cluster is smaller than the current reference value, the polarity of the output voltage of the circulating current suppression circuit is controlled to be positive, so that the current flowing through each battery cluster is increased.
8. The method for restraining the circulation current of the parallel battery clusters of the energy storage system according to claim 7, wherein if the real-time current sampling value of a certain battery cluster is greater than the current reference value, the polarity of the output voltage of the circulation current restraining circuit is controlled to be negative, so that the current flowing through each battery cluster is reduced, the current balance is promoted, and the circulation current is restrained.
9. The method for restraining the circulation of the parallel battery clusters of the energy storage system according to claim 6, wherein after a current balancing process is completed, the current real-time balancing state of all the battery clusters is re-evaluated, and the battery clusters needing to be balanced are re-balanced until the output currents of all the parallel battery clusters are equal, the circulation restraining circuit load short-circuit switches are all turned on, and the circulation restraining of the parallel battery clusters is completed.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210295332.1A CN114744699A (en) | 2022-03-24 | 2022-03-24 | Energy storage system parallel battery cluster circulation restraining device, method and medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210295332.1A CN114744699A (en) | 2022-03-24 | 2022-03-24 | Energy storage system parallel battery cluster circulation restraining device, method and medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115800416A (en) * | 2022-08-12 | 2023-03-14 | 宁德时代新能源科技股份有限公司 | Energy storage system, control method of energy storage system, computer device, and storage medium |
| CN116073493A (en) * | 2023-04-06 | 2023-05-05 | 西安图为电气技术有限公司 | Power control method, power energy storage system, device, equipment and storage medium |
| CN116780726A (en) * | 2023-08-22 | 2023-09-19 | 深圳海辰储能控制技术有限公司 | Circulation control method and system, energy storage device and electric equipment |
| CN117741509A (en) * | 2024-02-20 | 2024-03-22 | 天津大学 | Energy storage power station fault detection method, device, equipment, medium and program product |
-
2022
- 2022-03-24 CN CN202210295332.1A patent/CN114744699A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115800416A (en) * | 2022-08-12 | 2023-03-14 | 宁德时代新能源科技股份有限公司 | Energy storage system, control method of energy storage system, computer device, and storage medium |
| CN115800416B (en) * | 2022-08-12 | 2023-11-14 | 宁德时代新能源科技股份有限公司 | Energy storage system, control method of energy storage system, computer device and storage medium |
| CN116073493A (en) * | 2023-04-06 | 2023-05-05 | 西安图为电气技术有限公司 | Power control method, power energy storage system, device, equipment and storage medium |
| CN116073493B (en) * | 2023-04-06 | 2023-07-04 | 西安图为电气技术有限公司 | Power control method, power energy storage system, device, equipment and storage medium |
| CN116780726A (en) * | 2023-08-22 | 2023-09-19 | 深圳海辰储能控制技术有限公司 | Circulation control method and system, energy storage device and electric equipment |
| CN116780726B (en) * | 2023-08-22 | 2024-01-23 | 深圳海辰储能控制技术有限公司 | Circulation control method and system, energy storage device and electric equipment |
| CN117741509A (en) * | 2024-02-20 | 2024-03-22 | 天津大学 | Energy storage power station fault detection method, device, equipment, medium and program product |
| CN117741509B (en) * | 2024-02-20 | 2024-05-24 | 天津大学 | Energy storage power station fault detection method, device, equipment, medium and program product |
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