CN116191602A - Battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power - Google Patents
Battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power Download PDFInfo
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- CN116191602A CN116191602A CN202310068099.8A CN202310068099A CN116191602A CN 116191602 A CN116191602 A CN 116191602A CN 202310068099 A CN202310068099 A CN 202310068099A CN 116191602 A CN116191602 A CN 116191602A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- 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
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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
- H02J7/0068—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
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
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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 battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power, which comprises the following steps: calculating the difference value between the SOC of each unit cell in the retired power cell energy storage system and the total average SOC of the retired power cell energy storage system based on the SOC parameters of each unit cell, and performing PI correction on the difference value to obtain the charging and discharging power proportion value of each unit cell; and calculating the charge and discharge given power of each unit cell based on the charge and discharge power ratio value of each unit cell, and charging and discharging the corresponding unit cell according to the charge and discharge given power of each unit cell, so as to balance the SOC level of each unit cell, and finally enabling the SOCs of each unit cell of the retired power battery energy storage system to be consistent.
Description
Technical Field
The invention relates to a battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power, and belongs to the technical field of intelligent regulation of SOC consistency of an energy storage system of a retired power battery.
Background
With the increase of a large number of retirement of batteries of electric vehicles and the increase of power energy storage demands, the large-scale application of power batteries after retirement to energy storage systems becomes one of technical trends.
The retired power battery has reduced charge and discharge performance, and the charge and discharge multiplying power is only half of that of a new battery or even lower, so that the use requirement of the electric automobile can not be met, but the retired power battery can still continue to play a role in electric energy storage. The power battery still has high energy density after retirement, belongs to a high energy carrier, but the inconsistency of the discharge capacity of single batteries in a module can cause poor operation effect of the battery. Because the environmental conditions and the use time of the echelon power battery are greatly different when the echelon power battery runs on a vehicle, the capacity, the internal resistance characteristics and other parameters of each battery pack are different after the power battery is retired, so that the SOC change rate of different echelon battery energy storage units (formed by connecting a plurality of power battery packs in series, hereinafter referred to as unit batteries) is greatly different when the power battery packs are charged and discharged according to the same power. When the battery module is charged and discharged, the current flowing through the single batteries in the battery module should be kept consistent at all times, and the accumulated charge and discharge amounts of each battery should be equivalent. However, the aging rate and the self-discharge rate of the unit cell are different, so that the dischargeable amount of the unit cell is deviated, the consistency of the charge and discharge rates of the unit cell is deteriorated, the unit cell is protected by early charge or early discharge, and the dischargeable amount of the unit cell is reduced as a result. For the above reasons, the same charging power is applied to each unit cell, and after the same time period, a part of unit cells are charged, and the loss is large before the unit cells are retired, so that the unit cells can be fully charged only by the time t1, namely, the SOC reaches 100%. The other part of the unit cells have smaller loss, and cannot be fully charged through t1 under the same initial SOC condition, so that the SOC of each energy storage unit cell is inconsistent; also, in the case of discharging, after the same discharging time t2, some unit cells have been discharged, and another unit cell has not been discharged, which may also cause the SOC to be inconsistent among the unit cells. In the past, the SOC difference between each energy storage unit can be bigger and bigger, and this can make the charge and discharge management of whole energy storage system become more difficult, need frequent recalibration of the SOC of energy storage battery, and then can reduce the availability of whole echelon battery energy storage system by a wide margin.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power, and solve the problem of inconsistent charge and discharge SOCs of retired power batteries in the prior art.
In order to achieve the above object, the present invention adopts the following technical scheme:
a battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power comprises the following steps:
calculating the difference value between the SOC of each unit cell in the retired power cell energy storage system and the total average SOC of the retired power cell energy storage system based on the SOC parameters of each unit cell;
PI correction is carried out on the difference value, and the charging and discharging power proportion value of each unit cell is obtained;
calculating the charge and discharge given power of each unit cell based on the charge and discharge power proportion value of each unit cell;
and charging and discharging the corresponding unit cells by the EMS according to the given power of charging and discharging the unit cells.
Further, the calculation formula of the total average SOC of the retired power battery energy storage system is as follows:
wherein:
SOC i representing the SOC of the ith unit cell in the retired power cell energy storage system, i=1, 2 … … n;
n represents the number of unit cells in the retired power battery energy storage system;
Further, the calculation formula of the difference value between the SOC of each unit cell in the retired power battery energy storage system and the total average SOC of the retired power battery energy storage system is as follows:
wherein: ΔSOC (delta SOC) i And the difference value between the total average SOC of the ith unit cell and the total average SOC of the retired power battery energy storage system is represented.
Further, the step of calculating the charge/discharge power ratio value of each unit cell includes:
ΔSOC i Correcting through a PI correction link to obtain K i (i=1, 2 … … n), said K i Indicating the i-th cell charge/discharge power ratio value,
further, the open loop transfer function of the PI correction step is:
wherein:
k p -a scaling factor of the PI correction step;
k i integral coefficient of PI regulator。
Further, the calculation formula of the given charge and discharge power of each unit cell is as follows:
P i_ref ＝K i ×P s (4)
wherein:
P s indicating the total charge and discharge power instruction value of the retired power battery energy storage system;
P i_ref indicating the charge and discharge power set point of the ith unit cell.
The invention has the beneficial effects that:
1. after the power battery works on the trolley bus for a period of time, the performance of the power battery can be greatly reduced, and the power battery is insufficient for providing sufficient power for the trolley bus, but the power battery does not reach the waste degree at the moment, is collected and reused, can provide power for other equipment, reduces the cost, can also enlarge the resource utilization and reduces the environmental pollution.
2. The loss of the retired power battery is different, if the power battery is charged according to the uniform charging power, the charging rate of the whole power battery is unbalanced, and the charging and discharging rates of the batteries of the retired power battery system can be kept balanced by adopting the method, so that the damage of the retired power battery is avoided, and the service life is prolonged.
Drawings
FIG. 1 is a block diagram of a retired power battery energy storage system of the present invention;
FIG. 2 is a flow chart of the control strategy of the system of the present invention.
Detailed Description
The following detailed description of the technical solutions of the present invention is made by the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present application are detailed descriptions of the technical solutions of the present application, and not limiting the technical solutions of the present application, and the technical features of the embodiments and embodiments of the present application may be combined with each other without conflict.
The embodiment discloses a battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power, wherein the system is shown in fig. 1, and comprises an energy storage Energy Management System (EMS), an energy storage converter (PCS) and a retired power battery system, and the retired power battery system comprises a Battery Management System (BMS) and at least more than one retired power unit battery.
As can be seen from the combination of fig. 2, the difference Δsoc between the SOC of the retired power battery and the average SOC of the retired power battery energy storage system is calculated i The charge and discharge power proportion value K of each unit cell is obtained after PI correction link i And then the total charge and discharge power instruction value P of the retired power battery energy storage system is combined s Obtaining the set value P of the charge and discharge power of each unit cell i_ref Therefore, the charge and discharge power of each unit cell is corrected, and the consistency of the SOC of each unit service power cell is finally realized. The method comprises the following specific steps:
1. EMS collects the state of charge SOC sent by each unit battery BMS i And calculating the total average SOC of the retired power battery energy storage system:
wherein:
SOC i -SOC of the i-th cell in the retired power cell energy storage system, i=1, 2 … … n;
n-the number of unit cells of the energy storage system in the retired power battery;
2. Calculating state of charge SOC of each unit cell i And (3) with
Is the difference of (a):
wherein:
ΔSOC i -the difference between the i-th cell and the total average SOC of the retired power cell energy storage system;
SOC i SOC of the ith unit cell in the retired power battery energy storage system, i=1, 2 … … n.
3.ΔSOC i Correcting through a PI correction link, wherein the open loop transfer function of the PI correction link is as follows:
wherein:
k p -a scaling factor of the PI correction step;
k i -integral coefficient of PI regulator.
It can be seen that the system comprises a pole at the origin, is a type of system, and can be used for k according to the design method of the type of system p And k i Is designed according to the parameters of the model.
The PI correction link is adopted to obtain the charge and discharge power proportion value K of each unit cell i (i＝1,2……n)(0，100％)。
4. Output K of PI correction link i Total charge and discharge power command value P of energy storage system of retired power battery s Multiplying to obtain the charge and discharge power set value P of each unit cell of the retired power battery system i_ref (i＝1,2……n)：
P i_ref ＝K i ×P s (4)
Wherein:
P s -total charge and discharge power command value, W, of the retired power battery energy storage system;
P i_ref -the i-th cell charge and discharge power set point, W.
The EMS issues a charge/discharge power command P to each unit cell i_ref Through P i_ref To control the charge and discharge power of each unit cell,finally, the SOC of each unit cell is consistent through the power control of each unit.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (6)
1. The battery SOC consistency control strategy based on the active intelligent regulation of charge and discharge power is characterized by comprising the following steps:
calculating the difference value between the SOC of each unit cell in the retired power cell energy storage system and the total average SOC of the retired power cell energy storage system based on the SOC parameters of each unit cell;
PI correction is carried out on the difference value, and the charging and discharging power proportion value of each unit cell is obtained;
calculating the charge and discharge given power of each unit cell based on the charge and discharge power proportion value of each unit cell;
and charging and discharging the corresponding unit cells by the EMS according to the given power of charging and discharging the unit cells.
2. The battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power according to claim 1, wherein the calculation formula of the total average SOC of the retired power battery energy storage system is:
wherein:
SOC i representing the SOC of the ith unit cell in the retired power cell energy storage system, i=1, 2 … … n;
n represents the number of unit cells in the retired power battery energy storage system;
3. The battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power according to claim 2, wherein a calculation formula of a difference value between the SOC of each unit cell in the retired power battery energy storage system and a total average SOC of the retired power battery energy storage system is:
wherein: ΔSOC (delta SOC) i And the difference value between the total average SOC of the ith unit cell and the total average SOC of the retired power battery energy storage system is represented.
4. The battery SOC uniformity control strategy based on active intelligent regulation of charge and discharge power according to claim 3, wherein the step of calculating the charge and discharge power ratio values of each unit cell comprises:
ΔSOC i Correcting through a PI correction link to obtain K i (i=1, 2 … … n), said K i The i-th unit cell charge/discharge power ratio value is shown.
5. The battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power of claim 4, wherein the open loop transfer function of the PI correction link is:
wherein:
k p -a scaling factor of the PI correction step;
k i -integral coefficient of PI regulator.
6. The battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power according to claim 1, wherein the calculation formula of the charge and discharge given power of each unit cell is as follows:
P i_ref ＝K i ×P s (4)
wherein:
P s indicating the total charge and discharge power instruction value of the retired power battery energy storage system;
P i_ref indicating the charge and discharge power set point of the ith unit cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310068099.8A CN116191602A (en) | 2023-02-06 | 2023-02-06 | Battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310068099.8A CN116191602A (en) | 2023-02-06 | 2023-02-06 | Battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power |
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| CN116191602A true CN116191602A (en) | 2023-05-30 |
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| CN202310068099.8A Pending CN116191602A (en) | 2023-02-06 | 2023-02-06 | Battery SOC consistency control strategy based on active intelligent regulation of charge and discharge power |
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- 2023-02-06 CN CN202310068099.8A patent/CN116191602A/en active Pending
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