CN114884165B - Flow equalizing method and device for energy storage equipment - Google Patents
Flow equalizing method and device for energy storage equipment Download PDFInfo
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- CN114884165B CN114884165B CN202210515126.7A CN202210515126A CN114884165B CN 114884165 B CN114884165 B CN 114884165B CN 202210515126 A CN202210515126 A CN 202210515126A CN 114884165 B CN114884165 B CN 114884165B
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass 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
- H02J7/0047—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
- H02J7/0047—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]
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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
- H02J7/005—Detection of state of health [SOH]
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
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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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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a current equalizing method and device of energy storage equipment, and relates to the technical field of power electronics. The specific scheme comprises the following steps: acquiring energy storage parameters of each energy storage unit in the plurality of energy storage units, determining target time length of each energy storage unit according to the energy storage parameters of each energy storage unit, determining target energy storage units according to the target time length of each energy storage unit, then adjusting current charge and discharge power of the target energy storage units, re-determining the target energy storage units after each adjustment, and continuously adjusting the current charge and discharge power of the re-determined target energy storage units until the current charge and discharge power of the plurality of energy storage units is the same. The energy storage device comprises a plurality of energy storage units. The invention can ensure that each energy storage unit uniformly shares current on the basis of ensuring the stable operation of the energy storage equipment, and can complete full charge or full discharge simultaneously when each energy storage unit is charged or discharged, thereby exerting the maximum performance of the energy storage equipment.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a current equalizing method and device of energy storage equipment.
Background
The distributed energy storage equipment is a high-capacity power supply system formed by combining a plurality of small-capacity energy storage units. The distributed energy storage device has the advantages of large capacity, high charge and discharge efficiency, high reliability, strong expandability and the like.
In existing distributed energy storage devices, multiple energy storage units are often connected in parallel. By carrying out current sharing control on each energy storage unit, each energy storage unit can be ensured to uniformly share load current, and the stability of the distributed energy storage equipment during operation is improved. However, the energy storage units are not completely identical, for example, the remaining power of each energy storage unit may be different, and the existing current sharing control cannot ensure that each energy storage unit completes full charge or full discharge at the same time during charging or discharging, so that the distributed energy storage device cannot exert its maximum performance.
Disclosure of Invention
The invention provides a current equalizing method and device for distributed energy storage equipment, which can ensure that all energy storage modules complete full discharge at the same time on the premise of ensuring that all energy storage modules uniformly share load current, and improve the performance of the distributed energy storage equipment.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a current equalizing method of an energy storage device, the energy storage device including a plurality of energy storage units, the method including:
acquiring an energy storage parameter of each energy storage unit in the plurality of energy storage units, wherein the energy storage parameter comprises the current charge and discharge power of the energy storage unit;
determining a target time length of each energy storage unit according to the energy storage parameters of each energy storage unit, wherein the target time length is the time length required by the current full charge of the energy storage unit when the energy storage equipment is charged, and the target time length is the time length required by the current residual electric energy release of the energy storage unit when the energy storage equipment is discharged;
determining a target energy storage unit according to the target time length of each energy storage unit;
and adjusting the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each adjustment, and continuously adjusting the re-determined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the energy storage units are the same.
In one possible implementation, determining the target energy storage unit according to the target time length of each energy storage unit includes: the energy storage unit corresponding to the target time length with the shortest time length in the target time lengths is determined to be an alternative energy storage unit; when the alternative energy storage unit comprises a plurality of energy storage units, the energy storage unit with the maximum current charge and discharge power in the alternative energy storage unit is determined to be the target energy storage unit.
In one possible implementation, adjusting the current charge and discharge power of the target energy storage unit, redefining the target energy storage unit after each adjustment, and continuing to adjust the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the plurality of energy storage units are the same, including: and reducing the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each time of reduction, and continuously reducing the current charge and discharge power of the re-determined target energy storage unit until the current charge and discharge power of the plurality of energy storage units are the same.
In one possible implementation, determining the target energy storage unit according to the target time length of each energy storage unit includes: determining an average duration of the plurality of target durations; and determining the target energy storage unit according to the plurality of target time lengths and the average time length.
In one possible implementation, determining the target energy storage unit according to the plurality of target durations and the average duration includes: the energy storage units corresponding to the target time periods which are smaller than the average time period and have the shortest time period in the target time periods are determined to be alternative energy storage units; when the alternative energy storage unit comprises a plurality of energy storage units, the energy storage unit with the maximum current charge and discharge power in the alternative energy storage unit is determined to be the target energy storage unit.
In one possible implementation, adjusting the current charge and discharge power of the target energy storage unit, redefining the target energy storage unit after each adjustment, and continuing to adjust the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the plurality of energy storage units are the same, including: and reducing the current charge and discharge power of the target energy storage unit, and re-determining the average time length after each time of reduction, and re-determining the target energy storage unit until the target time length of the target energy storage unit is equal to the average time length.
In one possible implementation, the energy storage parameters further include a remaining capacity (SOC) Of the energy storage unit, a State Of Health (SOH), and a rated capacity, and determining, according to the energy storage parameter Of each energy storage unit, a target duration Of each energy storage unit includes: determining the residual capacity of each energy storage unit according to the residual electric quantity, the health degree and the rated capacity of each energy storage unit; and determining the target duration of each energy storage unit according to the residual capacity and the current charge and discharge power of each energy storage unit.
In a second aspect, the present invention provides a current equalizing apparatus of an energy storage device, including:
the energy storage device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring an energy storage parameter of each energy storage unit in a plurality of energy storage units, and the energy storage parameter comprises the current charge and discharge power of the energy storage unit;
the first determining module is used for determining the target duration of each energy storage unit according to the energy storage parameters of each energy storage unit, wherein the target duration is the duration required by the current full charge of the energy storage unit when the energy storage equipment is charged, and the target duration is the duration required by the current residual electric energy release of the energy storage unit when the energy storage equipment is discharged;
the second determining module is used for determining a target energy storage unit according to the target duration of each energy storage unit;
the adjusting module is used for adjusting the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each adjustment, and continuously adjusting the re-determined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the plurality of energy storage units are the same.
In one possible implementation manner, the second determining module is specifically configured to: the energy storage unit corresponding to the target time length with the shortest time length in the target time lengths is determined to be an alternative energy storage unit; and when the alternative energy storage unit comprises a plurality of energy storage units, determining the energy storage unit with the largest power in the alternative energy storage units as the target energy storage unit.
In one possible implementation, the adjusting module is specifically configured to: and reducing the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each time of reduction, and continuously reducing the current charge and discharge power of the re-determined target energy storage unit until the current charge and discharge power of the plurality of energy storage units are the same.
In one possible implementation manner, the second determining module is specifically configured to: determining an average duration of the plurality of target durations; and determining the target energy storage unit according to the plurality of target time lengths and the average time length.
In one possible implementation manner, the second determining module is specifically configured to: the energy storage units corresponding to the target time periods which are smaller than the average time period and have the shortest time period in the target time periods are determined to be alternative energy storage units; when the alternative energy storage unit comprises a plurality of energy storage units, the energy storage unit with the maximum current charge and discharge power in the alternative energy storage unit is determined to be the target energy storage unit.
In one possible implementation, the adjusting module is specifically configured to: and reducing the current charge and discharge power of the target energy storage unit, and re-determining the average time length after each time of reduction, and re-determining the target energy storage unit until the target time length of the target energy storage unit is equal to the average time length.
In one possible implementation manner, the energy storage parameter further includes a remaining power, a health degree, and a rated capacity of the energy storage unit, and the first determining module is specifically configured to: determining the residual capacity of each energy storage unit according to the residual electric quantity, the health degree and the rated capacity of each energy storage unit; and determining the target duration of each energy storage unit according to the residual capacity and the current charge and discharge power of each energy storage unit.
In a third aspect, the present invention provides a computer device comprising: a processor and a memory. The memory is used to store computer program code, which includes computer instructions. When the processor executes the computer instructions, the computer device performs the method of current sharing of the energy storage device as in the first aspect and any one of its possible implementations.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon computer instructions which, when run on a computer device, cause the computer device to perform a method of current sharing of an energy storage device as in the first aspect and any one of its possible implementations.
In a fifth aspect, the present invention provides a computer program product comprising computer instructions which, when run on a computer device, cause the computer device to perform a method of current sharing of an energy storage device as in the first aspect and any one of its possible implementations.
According to the current equalizing method of the energy storage equipment, energy storage parameters of each energy storage unit in the plurality of energy storage units are obtained, the target duration of each energy storage unit is determined according to the energy storage parameters of each energy storage unit, the target energy storage unit is determined according to the target duration of each energy storage unit, then the current charge and discharge power of the target energy storage unit is adjusted, the target energy storage unit is redetermined after each adjustment, and the current charge and discharge power of the redetermined target energy storage unit is continuously adjusted until the current charge and discharge power of the plurality of energy storage units is the same. The energy storage device comprises a plurality of energy storage units, the energy storage parameters comprise the current charging and discharging power of the energy storage units, the target time length is the time length required by the current full charge of the energy storage units when the energy storage device is charged, and the target time length is the time length required by the current residual electric energy release of the energy storage units when the energy storage device is discharged. Therefore, the target energy storage unit is redetermined after each adjustment, the adjusted target is always the energy storage unit which is charged and discharged firstly, only one target energy storage unit is adjusted when each adjustment is performed, the energy storage parameters of other energy storage units are not influenced, the stable operation of the energy storage device is ensured, in addition, the current charge and discharge power of the energy storage unit is continuously adjusted, the uniform current sharing of each energy storage unit can be finally ensured, and each energy storage unit can be charged or discharged simultaneously, so that the distributed energy storage device can exert the maximum performance.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage device according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a current equalizing method of an energy storage device according to an embodiment of the present invention;
fig. 3 is a second flow chart of a current equalizing method of an energy storage device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a current sharing device of an energy storage device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more. In addition, the use of "based on" or "according to" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" or "according to" one or more of the stated conditions or values may in practice be based on additional conditions or beyond the stated values.
Fig. 1 is a schematic structural diagram of an energy storage device according to an embodiment of the present invention. As shown in fig. 1, the energy storage device is formed by connecting a plurality of energy storage units in parallel, the energy storage units are DC/DC power modules, and in practical situations, energy storage parameters of each energy storage unit, such as a remaining power SOC, a health SOH, a rated capacity, and the like, are not completely consistent.
Taking the discharging operation of the energy storage device as an example, the main reason that current sharing is required when a plurality of energy storage units are in parallel operation is that since the output of the energy storage units is of a voltage source nature, a tiny deviation of the output voltage of the energy storage units can cause a great difference of output currents, and therefore, current sharing can be achieved by changing the characteristics of the voltage source (softening the characteristics) or changing the amplitude of the voltage source. From the current research on the current flow equalizing technology, in the energy storage equipment formed by connecting a plurality of energy storage units in parallel, the common current equalizing technologies for realizing the current equalizing control are a sagging method, a master/slave setting method, an average current automatic current equalizing method, a maximum current automatic current equalizing method, a thermal stress automatic current equalizing method and a current equalizing method of a current equalizing controller. However, the above current equalizing method can ensure that each energy storage unit uniformly shares the load current, so as to improve the stability of the energy storage device during operation, but cannot ensure that a plurality of energy storage units in the energy storage device complete full discharge at the same time. The analogous barrel effect shows that when one energy storage unit releases all the electric energy first, the energy storage device stops discharging, but at the moment, all the electric energy is not released in other energy storage units, so that the energy storage device cannot exert the maximum performance.
In order to solve the problem that the current flow equalization control cannot ensure that all energy storage units can be fully charged or fully discharged at the same time when being charged or discharged, so that the distributed energy storage equipment cannot exert the maximum performance of the distributed energy storage equipment, the embodiment of the invention provides a flow equalization method and a flow equalization device for the energy storage equipment, which are used for acquiring the energy storage parameters of each energy storage unit in a plurality of energy storage units, determining the target duration of each energy storage unit according to the energy storage parameters of each energy storage unit, determining the target energy storage unit according to the target duration of each energy storage unit, then adjusting the current charging and discharging power of the target energy storage unit, re-determining the target energy storage unit after each adjustment, and continuously adjusting the current charging and discharging power of the re-determined target energy storage unit until the current charging and discharging powers of the plurality of energy storage units are the same. The energy storage device comprises a plurality of energy storage units, the energy storage parameters comprise the current charging and discharging power of the energy storage units, the target time length is the time length required by the current full charge of the energy storage units when the energy storage device is charged, and the target time length is the time length required by the current residual electric energy release of the energy storage units when the energy storage device is discharged. Therefore, the target energy storage unit is redetermined after each adjustment, the adjusted target is always the energy storage unit which is charged and discharged firstly, only one target energy storage unit is adjusted when each adjustment is performed, the energy storage parameters of other energy storage units are not influenced, the stable operation of the energy storage device is ensured, in addition, the current charge and discharge power of the energy storage unit is continuously adjusted, the uniform current sharing of each energy storage unit can be finally ensured, and each energy storage unit can be charged or discharged simultaneously, so that the distributed energy storage device can exert the maximum performance.
The execution main body of the current equalizing method of the energy storage device provided by the embodiment of the invention is computer equipment, and the computer equipment can be communicated with a power management system corresponding to the energy storage device, so that the energy storage parameters of the energy storage device are obtained, and the power of the energy storage device can be controlled. The computer device may be a terminal, a server, or a server cluster formed by a plurality of servers. The embodiment of the invention is not limited.
Fig. 2 is a flow chart of a current equalizing method of an energy storage device according to an embodiment of the present invention. As shown in fig. 2, the current equalizing method of the energy storage device may include the following steps S201 to S204.
S201, acquiring an energy storage parameter of each energy storage unit in the plurality of energy storage units, wherein the energy storage parameter comprises the current charge and discharge power of the energy storage unit.
It is understood that the energy storage parameters include, but are not limited to, the current charge and discharge power, the remaining capacity, the current maximum capacity, the rated capacity, etc. of the energy storage unit. The current charging and discharging power of the energy storage unit is actual power when the energy storage unit actually operates, the residual capacity of the energy storage unit is residual available capacity when the energy storage unit actually operates, the current maximum capacity of the energy storage unit is actual maximum capacity when the energy storage unit actually operates, and the rated capacity of the energy storage unit is nominal capacity of the energy storage unit.
Specifically, the computer device may obtain an energy storage parameter of each of the plurality of energy storage units.
S202, determining a target time length of each energy storage unit according to energy storage parameters of each energy storage unit, wherein the target time length is a time length required by the current full charge of the energy storage unit when the energy storage equipment is charged, and is a time length required by the current residual electric energy released by the energy storage unit when the energy storage equipment is discharged.
It can be appreciated that the target time period is full charge time when the energy storage device is charged, and the target time period is full discharge time when the energy storage device is discharged.
Specifically, the computer device may obtain the remaining power SOC, the rated capacity C, and the health SOH of each energy storage unit, and then determine the remaining capacity C of each energy storage unit according to the remaining power SOC, the health SOH, and the rated capacity C of each energy storage unit R The calculation formula is as follows:
C R ＝SOC×C×SOH (1)
when the target time period t is the full-discharge time, the computer equipment can calculate the residual capacity C of each energy storage unit R And the current charge and discharge power P, determining the target duration of each energy storage unitt, the calculation formula is:
when the target time period t is full charge time, the computer equipment can calculate the rated capacity C, the health SOH and the residual capacity C of each energy storage unit R And the current charge and discharge power P, determining the target time length t of each energy storage unit, wherein the calculation formula is as follows:
s203, determining a target energy storage unit according to the target time length of each energy storage unit.
Specifically, the computer device may determine the target energy storage unit according to the target time length of each energy storage unit.
In one possible implementation manner, the computer device may determine, as the candidate energy storage unit, an energy storage unit corresponding to a target duration with a shortest duration among the plurality of target durations; when the alternative energy storage unit comprises a plurality of energy storage units, the computer equipment can determine the energy storage unit with the maximum current charge and discharge power in the alternative energy storage unit as a target energy storage unit; when the alternative energy storage unit includes only one energy storage unit, the computer device may determine the alternative energy storage unit as the target energy storage unit.
In another possible implementation manner, the computer device may determine, as the candidate energy storage unit, an energy storage unit corresponding to a target duration with a longest duration among the plurality of target durations; when the alternative energy storage unit comprises a plurality of energy storage units, the computer equipment can determine the energy storage unit with the smallest current charge and discharge power in the alternative energy storage unit as a target energy storage unit; when the alternative energy storage unit includes only one energy storage unit, the computer device may determine the alternative energy storage unit as the target energy storage unit.
S204, adjusting the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each adjustment, and continuously adjusting the re-determined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the energy storage units are the same.
Specifically, the computer device may adjust the current charge and discharge power of the target energy storage unit, redetermine the target energy storage unit after each adjustment, and continuously adjust the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the plurality of energy storage units are the same.
In one possible implementation manner, if the computer device determines the energy storage unit corresponding to the target duration with the shortest duration in the multiple target durations as the alternative energy storage unit, and determines the energy storage unit with the largest current charge and discharge power in the alternative energy storage unit as the target energy storage unit when the alternative energy storage unit includes multiple energy storage units, the computer device may reduce the current charge and discharge power of the target energy storage unit, redetermine the target energy storage unit after each reduction, and continuously reduce the current charge and discharge power of the redetermined target energy storage unit until the current charge and discharge powers of the multiple energy storage units are the same.
In another possible implementation manner, if the computer device determines the energy storage unit corresponding to the target duration with the longest duration in the multiple target durations as the alternative energy storage unit, and determines the energy storage unit with the smallest current charge and discharge power in the alternative energy storage unit as the target energy storage unit when the alternative energy storage unit includes multiple energy storage units, the computer device may increase the current charge and discharge power of the target energy storage unit, redetermine the target energy storage unit after each increase, and continue to increase the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the multiple energy storage units are the same.
For easy understanding, taking the target duration as the full-discharge time, the current equalizing method of the energy storage device in this embodiment will be further described by taking the example that the plurality of energy storage units includes an energy storage unit a and an energy storage unit B.
Assuming that the target duration of the energy storage unit a is 5 hours and the target duration of the energy storage unit B is 4 hours, the energy storage unit B will release all the electric energy first, and the computer device may use the energy storage unit B from which all the electric energy is released first as the target energy storage unit. Based on this, the computer device may reduce the current discharge power of the energy storage unit B, thereby reducing the rate at which the energy storage unit B discharges electrical energy, and the target duration of the energy storage unit B will increase accordingly. When the target time length of the energy storage unit B is the same as the target time length of the energy storage unit a, although the energy storage unit a and the energy storage unit B can finish full discharge at the same time, the current discharge power of the two energy storage units is not necessarily the same, that is, current discharge power of the two energy storage units is not realized, the computer equipment can determine the energy storage unit with larger current discharge power as the target energy storage unit to be adjusted next, current discharge power of the two energy storage units is reduced, the target time length of the two energy storage units is increased along with reduction of the current discharge power of the two energy storage units with larger current discharge power, the target energy storage units are converted into the energy storage units with shorter target time length of the two energy storage units, and the computer equipment continuously adjusts according to the strategies until the two energy storage units realize current equalization.
Likewise, the computer device may also take as the target energy storage unit the energy storage unit a from which all the electrical energy has been released at the latest. Based on this, the computer device may increase the current discharge power of the energy storage unit a, thereby increasing the rate at which the energy storage unit a discharges electrical energy, and the target duration of the energy storage unit a will decrease accordingly. When the target time length of the energy storage unit a is the same as the target time length of the energy storage unit B, although the energy storage unit a and the energy storage unit B can finish full discharge at the same time, the current discharge power of the two is not necessarily the same, that is, current flow equalization is not realized, the computer equipment can determine the energy storage unit with smaller current discharge power as the target energy storage unit to be adjusted next, the current discharge power of the energy storage unit is improved, the target time length of the energy storage unit is reduced along with the improvement of the current discharge power of the energy storage unit with smaller current discharge power, the target energy storage unit is converted into the energy storage unit with longer target time length in the two, and the computer equipment continuously adjusts according to the strategies until the current equalization is realized.
In summary, the computer device uses the target duration of the energy storage unit as the first priority and uses the current discharge power of the energy storage unit as the second priority, and screens the target energy storage unit to be adjusted from the plurality of energy storage units in real time and continuously adjusts the target energy storage unit, thereby ensuring that the plurality of energy storage units realize current sharing and simultaneously completing full charge and discharge of the plurality of energy storage units.
In this embodiment, the computer device obtains an energy storage parameter of each of the plurality of energy storage units, determines a target duration of each energy storage unit according to the energy storage parameter of each energy storage unit, determines a target energy storage unit according to the target duration of each energy storage unit, then adjusts current charge and discharge power of the target energy storage unit, redetermines the target energy storage unit after each adjustment, and continuously adjusts the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge power of the plurality of energy storage units is the same. The energy storage device comprises a plurality of energy storage units, the energy storage parameters comprise the current charging and discharging power of the energy storage units, the target time length is the time length required by the current full charge of the energy storage units when the energy storage device is charged, and the target time length is the time length required by the current residual electric energy release of the energy storage units when the energy storage device is discharged. Therefore, the target energy storage unit is redetermined after each adjustment, the adjusted target is always the energy storage unit which is charged and discharged firstly, only one target energy storage unit is adjusted when each adjustment is performed, the energy storage parameters of other energy storage units are not influenced, the stable operation of the energy storage device is ensured, in addition, the current charge and discharge power of the energy storage unit is continuously adjusted, the even current sharing of each energy storage unit can be finally ensured, and each energy storage unit can be charged or discharged simultaneously, so that the energy storage device can exert the maximum performance.
Alternatively, in addition to determining the target energy storage unit in the above two possible implementations in step S203, the target energy storage unit may be determined based on the average time length of the multiple target time lengths and the multiple target time lengths. Specifically, based on fig. 2, fig. 3 is a second flow chart of a current equalizing method of an energy storage device according to an embodiment of the present invention. As shown in fig. 3, the step S203 may include:
s301, determining average time lengths of a plurality of target time lengths.
In particular, the computer device may determine an average length of the plurality of target lengths.
S302, determining a target energy storage unit according to a plurality of target time lengths and the average time length.
Specifically, the computer device may determine the target energy storage unit according to a plurality of target durations and average durations
In one possible implementation manner, the computer device may determine, as the candidate energy storage unit, an energy storage unit corresponding to a target time length that is less than the average time length and has the shortest time length among the plurality of target time lengths, and determine, as the target energy storage unit, an energy storage unit with the largest current charge and discharge power among the candidate energy storage units when the candidate energy storage unit includes the plurality of energy storage units; when the alternative energy storage unit includes only one energy storage unit, the alternative energy storage unit is determined as the target energy storage unit. Based on this, the computer device may decrease the current charge and discharge power of the target energy storage unit, redetermine the average duration after each decrease, and redetermine the target energy storage unit until the target duration of the target energy storage unit is equal to the average duration.
In another possible implementation manner, the computer device may determine an energy storage unit corresponding to a target duration that is greater than the average duration and has the longest duration among the plurality of target durations as an alternative energy storage unit, and determine, as the target energy storage unit, an energy storage unit with the smallest current charge and discharge power among the alternative energy storage units when the alternative energy storage unit includes the plurality of energy storage units; when the alternative energy storage unit includes only one energy storage unit, the alternative energy storage unit is determined as the target energy storage unit. Based on this, the computer device may increase the current charge and discharge power of the target energy storage unit, and redetermine the average duration after each increase, and redetermine the target energy storage unit until the target duration of the target energy storage unit is equal to the average duration.
In this embodiment, the computer device uses the target time length of the energy storage units as the first priority, uses the current charge and discharge power of the energy storage units as the second priority, uses the average time length as the adjustment reference in real time, screens out the target energy storage units to be adjusted from the plurality of energy storage units, and along with continuous adjustment of the computer device, the current charge and discharge power of all the energy storage units will be continuously converged, and the target time lengths of all the energy storage units will be gradually converged to the average time length, thereby eventually realizing current sharing, and enabling each energy storage unit to complete full charge or full discharge at the same time during charging or discharging.
The above description has been presented mainly in terms of apparatus for the solution provided by the embodiments of the present invention. It will be appreciated that the apparatus, in order to achieve the above-described functions, comprises hardware structures and/or software modules corresponding to the execution of the respective functions. Those of skill in the art will readily appreciate that the various illustrative algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Fig. 4 shows a schematic diagram of a possible composition of the current sharing apparatus of the energy storage device according to the foregoing embodiment, and as shown in fig. 4, the current sharing apparatus of the energy storage device may include an obtaining module 41, a first determining module 42, a second determining module 43, and an adjusting module 44.
The acquiring module 41 is configured to acquire an energy storage parameter of each of the plurality of energy storage units, where the energy storage parameter includes a current charge and discharge power of the energy storage unit.
The first determining module 42 is configured to determine a target duration of each energy storage unit according to the energy storage parameter of each energy storage unit, where the target duration is a duration required by the current full charge of the energy storage unit when the energy storage device is charged, and the target duration is a duration required by the current residual electric energy released by the energy storage unit when the energy storage device is discharged.
The second determining module 43 is configured to determine a target energy storage unit according to the target duration of each energy storage unit.
The adjusting module 44 is configured to adjust the current charge and discharge power of the target energy storage unit, redetermine the target energy storage unit after each adjustment, and continuously adjust the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge powers of the plurality of energy storage units are the same.
Optionally, the second determining module 43 is specifically configured to: the energy storage unit corresponding to the target time length with the shortest time length in the target time lengths is determined to be an alternative energy storage unit; when the alternative energy storage unit comprises a plurality of energy storage units, the energy storage unit with the maximum current charge and discharge power in the alternative energy storage unit is determined to be the target energy storage unit.
Optionally, the adjusting module 44 is specifically configured to: and reducing the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each time of reduction, and continuously reducing the current charge and discharge power of the re-determined target energy storage unit until the current charge and discharge power of the plurality of energy storage units are the same.
Optionally, the second determining module 43 is specifically configured to: determining an average duration of the plurality of target durations; and determining the target energy storage unit according to the plurality of target time lengths and the average time length.
Optionally, the second determining module 43 is specifically configured to: the energy storage units corresponding to the target time periods which are smaller than the average time period and have the shortest time period in the target time periods are determined to be alternative energy storage units; when the alternative energy storage unit comprises a plurality of energy storage units, the energy storage unit with the maximum current charge and discharge power in the alternative energy storage unit is determined to be the target energy storage unit.
Optionally, the adjusting module 44 is specifically configured to: and reducing the current charge and discharge power of the target energy storage unit, and re-determining the average time length after each time of reduction, and re-determining the target energy storage unit until the target time length of the target energy storage unit is equal to the average time length.
Optionally, the energy storage parameters further include a remaining power, a health degree, and a rated capacity of the energy storage unit, and the first determining module 42 is specifically configured to: determining the residual capacity of each energy storage unit according to the residual electric quantity, the health degree and the rated capacity of each energy storage unit; and determining the target duration of each energy storage unit according to the residual capacity and the current charge and discharge power of each energy storage unit.
Of course, the current equalizing device of the energy storage device provided by the embodiment of the invention comprises but is not limited to the above modules.
The current equalizing device of the energy storage equipment provided by the embodiment of the invention is used for executing the current equalizing method of the energy storage equipment, so that the same effect as that of the current equalizing method of the energy storage equipment can be achieved.
Another embodiment of the present invention also provides a computer apparatus including: a processor and a memory. The memory is used to store computer program code, which includes computer instructions. When the processor executes the computer instructions, the computer device executes the current sharing method of the energy storage device as shown in the method embodiment.
Another embodiment of the present invention further provides a computer readable storage medium, where computer instructions are stored, when the computer instructions are executed on a computer device, cause the computer device to perform a current sharing method of an energy storage device as shown in the foregoing method embodiment.
Another embodiment of the present invention also provides a computer program product comprising computer instructions which, when run on a computer device, cause the computer device to perform a method for current sharing of an energy storage device as shown in the above-described method embodiments.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method of current sharing of an energy storage device, the energy storage device comprising a plurality of energy storage units, comprising:
acquiring an energy storage parameter of each energy storage unit in the plurality of energy storage units, wherein the energy storage parameter comprises the current charge and discharge power of the energy storage unit;
determining a target time length of each energy storage unit according to energy storage parameters of each energy storage unit, wherein the target time length is a time length required by the current full charge of the energy storage units when the energy storage equipment is charged, and is a time length required by the current residual electric energy released by the energy storage units when the energy storage equipment is discharged;
determining a target energy storage unit according to the target time length of each energy storage unit;
the current charge and discharge power of the target energy storage unit is adjusted, the target energy storage unit is redetermined after each adjustment, and the redetermined current charge and discharge power of the target energy storage unit is continuously adjusted until the current charge and discharge power of the plurality of energy storage units is the same;
the determining the target energy storage unit according to the target time length of each energy storage unit comprises the following steps:
the energy storage unit corresponding to the target time length with the shortest time length in the target time lengths is determined to be an alternative energy storage unit;
and when the alternative energy storage units comprise a plurality of energy storage units, determining the energy storage unit with the largest current charge and discharge power in the alternative energy storage units as the target energy storage unit.
2. The method for equalizing current flow of an energy storage device according to claim 1, wherein said adjusting current charge and discharge power of said target energy storage unit, redefining the target energy storage unit after each adjustment, and continuing to adjust the redetermined current charge and discharge power of the target energy storage unit until the current charge and discharge power of said plurality of energy storage units are the same, comprises:
and reducing the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each time of reduction, and continuously reducing the current charge and discharge power of the re-determined target energy storage unit until the current charge and discharge power of the plurality of energy storage units is the same.
3. The method for current sharing of an energy storage device according to claim 1, wherein determining the target energy storage unit according to the target time length of each energy storage unit comprises:
determining an average duration of the plurality of target durations;
and determining the target energy storage unit according to the target time lengths and the average time length.
4. The method of current sharing of an energy storage device according to claim 3, wherein determining the target energy storage unit according to the plurality of target durations and the average duration comprises:
the energy storage units corresponding to the target time periods with the shortest time period which are smaller than the average time period in the target time periods are determined to be alternative energy storage units;
and when the alternative energy storage units comprise a plurality of energy storage units, determining the energy storage unit with the largest current charge and discharge power in the alternative energy storage units as the target energy storage unit.
5. The method for equalizing current flow in an energy storage device according to claim 4, wherein said adjusting current charge and discharge power of said target energy storage unit, re-determining the target energy storage unit after each adjustment, and continuing to adjust the re-determined current charge and discharge power of the target energy storage unit until the current charge and discharge power of said plurality of energy storage units are the same, comprises:
and reducing the current charge and discharge power of the target energy storage unit, and re-determining the average time length after each time of reduction, and re-determining the target energy storage unit until the target time length of the target energy storage unit is equal to the average time length.
6. The current sharing method of an energy storage device according to any one of claims 1-5, wherein the energy storage parameters further include a remaining power, a health, and a rated capacity of the energy storage unit, and the determining the target duration of each energy storage unit according to the energy storage parameter of each energy storage unit includes:
determining the residual capacity of each energy storage unit according to the residual electric quantity, the health degree and the rated capacity of each energy storage unit;
and determining the target duration of each energy storage unit according to the residual capacity and the current charge and discharge power of each energy storage unit.
7. A current sharing apparatus of an energy storage device, the energy storage device including a plurality of energy storage units, comprising:
the energy storage device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring energy storage parameters of each energy storage unit in the plurality of energy storage units, and the energy storage parameters comprise the current charge and discharge power of the energy storage unit;
the first determining module is used for determining a target time length of each energy storage unit according to energy storage parameters of each energy storage unit, wherein the target time length is a time length required by the current full charge of the energy storage unit when the energy storage equipment is charged, and the target time length is a time length required by the current residual electric energy released by the energy storage unit when the energy storage equipment is discharged;
the second determining module is used for determining a target energy storage unit according to the target duration of each energy storage unit;
the adjusting module is used for adjusting the current charge and discharge power of the target energy storage unit, re-determining the target energy storage unit after each adjustment, and continuously adjusting the re-determined current charge and discharge power of the target energy storage unit until the current charge and discharge power of the plurality of energy storage units is the same;
the second determining module is specifically configured to:
the energy storage unit corresponding to the target time length with the shortest time length in the target time lengths is determined to be an alternative energy storage unit;
and when the alternative energy storage units comprise a plurality of energy storage units, determining the energy storage unit with the largest current charge and discharge power in the alternative energy storage units as the target energy storage unit.
8. A computer device, the computer device comprising: a processor and a memory; the memory is used for storing computer program codes, and the computer program codes comprise computer instructions; when the processor executes the computer instructions, the computer device performs the method of current sharing of the energy storage device of any of claims 1-6.
9. A computer readable storage medium comprising computer instructions which, when run on a computer device, cause the computer device to perform a method of current sharing of an energy storage device as claimed in any one of claims 1 to 6.
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