CN110323810B - Energy storage power supply system and charge-discharge control method thereof - Google Patents
Energy storage power supply system and charge-discharge control method thereof Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 220
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000005457 optimization Methods 0.000 claims abstract description 78
- 238000007599 discharging Methods 0.000 claims abstract description 77
- 239000011159 matrix material Substances 0.000 claims description 15
- 230000004913 activation Effects 0.000 claims description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 16
- 230000032683 aging Effects 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000000750 progressive effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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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- H02J7/0077—
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- H02J7/0091—
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a charge-discharge control method of an energy storage power supply system, which comprises the following steps: the method comprises the steps of firstly determining a derating coefficient of an energy storage battery in an energy storage power supply system and determining a charging and discharging target parameter of the energy storage battery, then calculating to obtain a charging and discharging optimization parameter of the energy storage battery according to the charging and discharging target parameter and the derating coefficient, and then sending the charging and discharging optimization parameter to a controller in the energy storage power supply system so that the energy storage battery is charged and discharged according to the charging and discharging optimization parameter, therefore, the energy storage battery is charged and discharged according to the charging and discharging optimization parameter matched with the receivable charging and discharging parameter no matter how the state of the energy storage battery is, the loss of the energy storage battery is reduced, and the electricity consumption cost is low.
Description
Technical Field
The invention belongs to the technical field of charging and discharging, and particularly relates to an energy storage power supply system and a charging and discharging control method thereof.
Background
With the development of energy storage technology, energy storage power supply systems have wide application prospects, such as outdoor emergency power supplies, mobile electricity supplementing vehicles, communication base station standby power supplies and the like.
At present, the cost of the lithium battery is high, and the electricity consumption cost of the lithium battery can be reduced by prolonging the cycle life of the lithium battery. The charging and discharging strategy of the lithium battery has great influence on the cycle life and even the safety and reliability, so that the lithium battery is charged and discharged in a proper charging and discharging current range, the cycle life can be prolonged, and the charging and discharging safety can be guaranteed.
In the prior art, in the charging process of an energy storage power supply system, a charger outputs corresponding charging current to a battery according to a current demand sent by a battery management system, however, the current demand sent by the battery management system is usually determined when the battery leaves a factory; however, in the subsequent use process, as the battery ages, the receivable charging current of the battery also changes, so that after the battery ages, the charging and discharging current received by the battery is not matched with the receivable charging and discharging current of the battery, the battery loss is accelerated, and the electricity consumption cost is high.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an energy storage power system and a charge/discharge control method thereof, which are used for controlling charge/discharge optimization parameters of the energy storage power system in real time, so that the charge/discharge optimization parameters are matched with receivable charge/discharge parameters of a battery.
The invention discloses a charge-discharge control method of an energy storage power supply system, which is applied to a battery management system of the energy storage power supply system; the charge and discharge control method of the energy storage power supply system comprises the following steps:
determining a derating coefficient of an energy storage battery in the energy storage power supply system;
determining charge and discharge target parameters of the energy storage battery;
calculating to obtain charge-discharge optimization parameters of the energy storage battery according to the charge-discharge target parameters and the derating coefficient;
and sending the charge-discharge optimization parameters to a controller in the energy storage power supply system so that the energy storage battery is charged and discharged according to the charge-discharge optimization parameters.
Optionally, the determining a derating coefficient of an energy storage battery in the energy storage power supply system includes:
according to the total throughput capacity of the energy storage battery and the current accumulated throughput capacity of the energy storage battery, a formula eta is 1-Cn/(k×C0) Or, η ═ 1-B × exp (-Ea/RT) Cn k1Calculating to obtain a derating coefficient of the energy storage battery;
wherein eta is derating coefficient of the energy storage battery, C0Is the total throughput capacity, C, of the energy storage cellnFor the currently accumulated throughput capacity of the energy storage battery, k and k1 are attenuation factors, B is a pre-exponential factor, Ea is activation energy, R is an ideal gas constant, and T is ambient temperature.
Alternatively, k is 5 and k1 is 0.5.
Optionally, the determining the charge and discharge target parameter of the energy storage battery includes:
acquiring the residual electric quantity SOC and the temperature of the energy storage battery;
and determining the charge and discharge target parameters of the energy storage battery according to the SOC and the temperature and a preset charge and discharge limit value matrix table.
Optionally, the obtaining the remaining capacity SOC of the energy storage battery includes:
and calculating the SOC of the energy storage battery according to a time integration method.
Optionally, the charge-discharge optimization parameter of the energy storage battery is obtained by calculation according to the charge-discharge target parameter and the derating coefficient, and the formula is as follows:
Q＝Q0*η；
wherein Q is the charge-discharge optimization parameter, Q0And eta is the derating coefficient, wherein eta is the charge-discharge target parameter.
Optionally, the charge and discharge target parameter and the discharge optimization parameter are both: a current parameter, or, a power parameter.
Optionally, if the energy storage battery is about to enter the discharging state, before sending the charge-discharge optimization parameter to the controller in the energy storage power supply system, the method further includes:
receiving a charging demand parameter sent by a load through the controller;
judging whether the charging demand parameter is smaller than the charging and discharging optimization parameter;
and if the charging demand parameter is smaller than the charging and discharging optimization parameter, updating the charging and discharging optimization parameter by the charging demand parameter.
The second aspect of the present invention discloses an energy storage power supply system, including: the system comprises an energy storage battery, a battery management system, a controller, a converter system, a charging interface and a charging gun; wherein:
the first end of the converter system is connected with the charging interface;
the second end of the converter system is connected with the energy storage battery;
the third end of the converter system is connected with a battery of a load through the charging gun;
the battery management system is used for detecting and recording the operating parameters of the energy storage battery and executing the charge and discharge control method of the energy storage power supply system disclosed by the first aspect of the invention;
and the controller is respectively connected with the control end of the converter system, the battery management system and the battery management system of the load.
Optionally, the converter system includes: a DC/DC converter and a DC/AC converter;
the DC/DC converter is connected between the energy storage battery and the charging gun;
the alternating current side of the DC/AC converter is connected with the charging interface, and the direct current side of the DC/AC converter is connected with the charging gun.
Optionally, the energy storage battery includes: any one of a lithium iron phosphate battery, a ternary battery and a lithium manganate battery.
Optionally, the energy storage power supply system is a mobile energy storage power supply system or a fixed energy storage power supply system.
According to the technical scheme, the derating coefficient of the energy storage battery in the energy storage power supply system and the charging and discharging target parameter of the energy storage battery are determined, the charging and discharging optimization parameter of the energy storage battery is calculated according to the charging and discharging target parameter and the derating coefficient, and then the charging and discharging optimization parameter is sent to the controller in the energy storage power supply system, so that the energy storage battery is charged and discharged according to the charging and discharging optimization parameter, and therefore, the energy storage battery is charged and discharged according to the charging and discharging optimization parameter matched with the receivable charging and discharging parameter no matter the state of the energy storage battery, the loss of the energy storage battery is reduced, and the electricity consumption cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a charging and discharging control method of an energy storage power supply system according to an embodiment of the present invention;
fig. 2 is a flowchart of determining a charging/discharging target parameter of an energy storage power system in a charging/discharging control method of the energy storage power system according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for controlling charging and discharging of an energy storage power system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an energy storage power system according to an embodiment of the invention;
fig. 5 is a schematic diagram of a converter system in an energy storage power system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "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 embodiment of the invention discloses a charge and discharge control method of an energy storage power supply system, which aims to solve the problems that receivable charge and discharge currents of a battery are changed along with the aging of the battery, so that the received charge and discharge currents of the battery are not matched with the receivable charge and discharge currents of the battery after the battery is aged, the battery loss is accelerated, and the electricity consumption cost is high.
The charging and discharging control method is applied to a battery management system of an energy storage power supply system, and referring to fig. 1, a flow chart of the charging and discharging control method of the energy storage power supply system is shown, and the method specifically includes the following steps:
s101, determining a derating coefficient of an energy storage battery in an energy storage power supply system.
The derating coefficient of the energy storage battery is related to the aging degree of the energy storage battery, wherein the larger the aging degree of the energy storage battery is, the smaller the corresponding derating coefficient is.
In practical application, the aging degree of the energy storage battery can be represented by using two parameters, namely the throughput capacity accumulated at present of the energy storage battery or the charging and discharging times accumulated at present of the energy storage battery, specifically, the aging degree of the energy storage battery can be represented by using the two parameters in percentage of the respective preset total amount, the larger the percentage of the two parameters in percentage of the respective preset total amount is, the larger the aging degree of the energy storage battery is, of course, other values capable of representing the service life of the energy storage battery can also be used for representing the aging degree of the energy storage battery, and are not repeated one by one here, and are all in the protection range of the application.
In the implementation, the derating coefficient is introduced to solve the problem that the energy storage battery is damaged due to the fact that the receivable charging and discharging parameters of the energy storage battery are reduced due to aging of the energy storage battery in the charging and discharging process of the battery, and the service life of the energy storage battery is further prolonged.
Assuming that the acceptable charging and discharging current is linearly decreased along with the capacity attenuation, in practical application, the formula η ═ 1-C may be adopted according to the total throughput capacity of the energy storage battery and the currently accumulated throughput capacity of the energy storage batteryn/(k×C0) And calculating to obtain the derating coefficient of the energy storage battery. Wherein eta is derating coefficient of the energy storage battery, C0For storing energyTotal throughput capacity of the pool, CnThe current accumulated throughput capacity for the energy storage battery; k is an attenuation factor, and since the capacity of the energy storage battery at the end of the service life is 80% of the initial value, the k value is preferably 5, so that the final charge-discharge current is just 80% of the initial value; of course, k may also take other values in practical applications, such as 4.9 or 5.1, etc., and is not specifically limited herein, depending on the application environment, and is within the protection scope of the present application.
Alternatively, the formula η ═ 1-B × exp (-Ea/RT) C may be usedn k1Calculating to obtain a derating coefficient of the energy storage battery; wherein, B is a pre-exponential factor, Ea is activation energy, and the B and the Ea are data obtained according to experiments; r is ideal gas constant, R is 8.314 J.mol-1·K-1(ii) a T is ambient temperature, in K; k1 is another attenuation factor, preferably 0.5 according to empirical values, and its specific value depends on the application environment, and is within the protection scope of the present application.
Of course, the derating coefficient may be calculated according to other formulas, which are only an example and not limited thereto, and are determined according to the specific application environment, and are within the protection scope of the present application.
And S102, determining charge and discharge target parameters of the energy storage battery.
The charge and discharge target parameters are parameters when the energy storage battery is charged and discharged under ideal conditions. The charge and discharge target parameter is related to a State parameter of the energy storage battery, such as a State of charge (SOC) and a temperature of the energy storage battery.
In practical applications, the charge and discharge target parameter may be a current parameter or a power parameter. And when the charge and discharge target parameter is a power parameter, determining the charge and discharge target power parameter of the energy storage battery.
It should be noted that, in this embodiment, step S101 may be executed first, and then step S102 is executed, or step S102 may be executed first, and then step S101 is executed, or both may be executed at the same time; here, the order of executing step S101 and step S102 is not specifically limited, and is within the scope of the present application.
And S103, calculating to obtain charge and discharge optimization parameters of the energy storage battery according to the charge and discharge target parameters and the derating coefficient.
In practical application, the charge and discharge target parameter and the charge and discharge optimization parameter may both be current parameters, or the charge and discharge target parameter and the charge and discharge optimization parameter may both be power parameters. The type of the charge and discharge optimization parameter and the type of the charge and discharge target parameter should be consistent, that is, if the charge and discharge target parameter is a current parameter, the charge and discharge optimization parameter is a current parameter, and if the charge and discharge target parameter is a power parameter, the charge and discharge optimization parameter is a power parameter.
Specifically, when the charge-discharge target parameter and the charge-discharge optimization parameter are both current parameters, calculating to obtain the charge-discharge optimization current parameter of the energy storage battery according to the charge-discharge target current parameter and the derating coefficient; and when the charge-discharge target parameter and the charge-discharge optimization parameter are both power parameters, calculating to obtain the charge-discharge optimization power parameter of the energy storage battery according to the charge-discharge target power parameter and the derating coefficient.
In practical application, Q is expressed by the formula0Eta, calculating to obtain the charge and discharge optimization parameters of the energy storage battery, wherein Q is the charge and discharge optimization parameters, Q0Eta is a derating coefficient for the charge-discharge target parameter. Q may represent current or power, and will not be described herein.
And S104, sending the charge and discharge optimization parameters to a controller in the energy storage power supply system so that the energy storage battery is charged and discharged according to the charge and discharge optimization parameters.
And when the charge-discharge optimization parameters are the charge-discharge optimization current parameters, the charge-discharge optimization current parameters are sent to a controller in the energy storage power supply system, so that the energy storage battery is charged and discharged according to the charge-discharge optimization current parameters.
And when the charge-discharge optimization parameters are the charge-discharge optimization power parameters, the charge-discharge optimization power parameters are sent to a controller in the energy storage power supply system, so that the energy storage battery is charged and discharged according to the charge-discharge optimization power parameters.
In this embodiment, the charge-discharge optimization parameters of the energy storage battery are calculated according to the charge-discharge target parameters and the derating coefficient, so that the energy storage battery is charged and discharged according to the charge-discharge optimization parameters matched with the receivable charge-discharge parameters no matter how the state of the energy storage battery is, the energy storage battery loss is reduced, and the electricity consumption cost is low.
Optionally, the determining of the charge and discharge target parameter of the energy storage battery, which is referred to in step S102 in fig. 1 in the embodiment of the present invention, with reference to fig. 2, specifically includes the following steps:
s201, obtaining the SOC and the temperature of the energy storage battery.
In this embodiment, the SOC and the temperature may be obtained by a battery management system of the energy storage battery.
In practical application, the SOC of the energy storage battery can be obtained through calculation according to an ampere-hour integration method; of course, the SOC of the energy storage battery may also be obtained by calculating the electric quantity change caused by the current charge and discharge process according to an integral method, updating the total electric quantity before the current charge and discharge according to the electric quantity change, and dividing by the rated capacity of the energy storage battery.
S202, determining charge and discharge target parameters of the energy storage battery according to the SOC and the temperature and a preset charge and discharge limit value matrix table.
The preset charging and discharging limit value matrix table is preset in the controller, the preset charging and discharging limit value matrix table comprises corresponding relations of SOC, temperature and charging and discharging target parameters, and the preset charging and discharging limit value matrix table can be a charging and discharging current limiting matrix table and can also be a charging and discharging power limit value matrix table.
And if the charge and discharge target parameters are current parameters, determining the charge and discharge target current parameters of the energy storage battery according to the SOC and the temperature and a preset charge and discharge current limiting matrix table. And if the charge and discharge target parameters are power parameters, determining the charge and discharge target power parameters of the energy storage battery according to the SOC and the temperature and a preset charge and discharge power limit value matrix table. The charge and discharge current limiting matrix table comprises: corresponding relation among SOC, temperature and charge-discharge target current parameters; the charge and discharge power limit value matrix table includes: and the corresponding relation among the SOC, the temperature and the charge and discharge target power parameter.
It should be noted that, as long as the SOC and the temperature of the energy storage battery are the same, the charge and discharge target parameters corresponding to the SOC and the temperature obtained from the preset charge and discharge limit matrix table are the same, that is, the charge and discharge target parameters obtained from the preset charge and discharge limit matrix table are irrelevant to the aging degree of the energy storage battery, that is, the charge and discharge target parameters obtained from the preset charge and discharge limit matrix table are the same when the SOC and the temperature of the energy storage battery are consistent no matter the energy storage battery is just shipped or the energy storage battery is about to be scrapped.
Therefore, if the energy storage battery is charged and discharged according to the charging and discharging target parameters, the energy storage battery may be charged and discharged according to parameters larger than the receivable charging and discharging parameters, so that the energy storage battery is damaged, and the service life of the energy storage battery is shortened.
In the embodiment, the charge and discharge target parameters are optimized subsequently to obtain the charge and discharge optimized parameters, and the energy storage battery is charged and discharged by the charge and discharge optimized parameters, so that the problems that the energy storage battery is possibly charged and discharged by the parameters larger than the charge and discharge parameters which can be received by the energy storage battery, the energy storage battery is damaged, and the service life of the energy storage battery is shortened are solved.
In addition, in practical applications, the implementation manner of S102 is not limited to be implemented by step S201 and step S202, and may also be implemented by other manners, and specific implementation manners may refer to the prior art, which is not described herein any more, and all of which are within the protection scope of the present application.
Optionally, on the basis of fig. 1 and 2, if the energy storage battery is about to enter the discharging state, before step S104, referring to fig. 3 (which is shown on the basis of fig. 1 as an example), the method may further include:
and S301, receiving the charging demand parameters sent by the load through the controller.
It should be noted that, before the energy storage battery performs the discharging action, it is necessary to receive a charging request sent by the load, where the charging request includes a charging requirement parameter, and the charging request triggers the energy storage battery to discharge, where a size of the discharging parameter of the energy storage battery is related to the charging requirement parameter sent by the load.
S302, judging whether the charging demand parameter is smaller than the charging and discharging optimization parameter.
In practical application, because the specifications of the loads are different and the charging demand parameters are different, in order to meet the charging request and the safety of the loads, when the energy storage battery charges the loads, the discharging parameters of the energy storage battery should not be greater than the charging demand parameters sent by the loads, so that the overcurrent damage of the loads is avoided, and the safe use of the loads is ensured, therefore, if the charging demand parameters are greater than or equal to the charging and discharging optimization parameters, the charging and discharging optimization parameters do not need to be updated, and the step S104 is directly executed; the energy storage battery discharges according to the charge-discharge optimization parameters, so that the load is charged according to the charge-discharge optimization parameters, the safety of the energy storage battery is ensured, and the service life of the energy storage battery is prolonged. If the charging demand parameter is smaller than the charging/discharging optimization parameter, step S303 is executed.
And S303, updating the charge and discharge optimization parameters according to the charge demand parameters.
The updated charge-discharge optimization parameter is the charge demand parameter, that is, when the charge demand parameter is smaller than the charge-discharge optimization parameter, the energy storage battery discharges according to the charge demand parameter, so that the load is charged according to the charge demand parameter.
In this embodiment, when the charging demand parameter is less than the charging and discharging optimization parameter, the charging and discharging optimization parameter is updated according to the charging demand parameter, so that in the discharging process, the energy storage battery is charged by using the charging demand parameter sent by the load as the load, that is, the load is charged by using the charging parameter that can be born by itself, thereby avoiding the overcurrent damage of the load, ensuring the safety of the load, and further prolonging the service life of the load.
The embodiment of the invention discloses an energy storage power supply system, which is shown in figure 4 and comprises the following components: energy storage battery 410, battery management system 420, controller 430, converter system 440, charging interface 450 and charging gun 460.
A first end of the converter system 440 is connected to a charging interface 450.
A second terminal of the converter system 440 is connected to the energy storage battery 410.
The third terminal of the converter system 440 is connected to the battery of the load through a charging gun 460.
The battery management system 420 is used to detect and record the operating parameters of the energy storage battery 410.
The controller 430 is connected to the control terminal of the converter system 440, the battery management system 420, and the battery management system of the load, respectively.
The process and principle of the battery management system 420 executing the charging and discharging control method are referred to the above embodiments, and are not described in detail herein.
Herein, the charge and discharge optimization parameters in the charging process are referred to as charge optimization parameters, the charge and discharge optimization parameters in the discharging process are referred to as discharge optimization parameters, and the components in the energy storage power supply system in the charging process and the discharging process are described as follows:
and (3) charging process: after the battery management system 420 executes any of the above-described charge and discharge control methods for the energy storage power supply system to obtain the charge optimization parameters, sending a charge request to the controller 430, where the charge request includes the charge optimization parameters; the controller 430 sends the charging request to the power supply device, after receiving the charging request sent by the controller 430 of the energy storage power supply system, the power supply device outputs electric energy to the converter system 440 through the charging interface 450, and after receiving the electric energy output by the power supply device, the converter system 440 performs conversion processing on the electric energy and outputs the processed electric energy to the energy storage battery 410, so that the energy storage battery 410 is charged.
Here, the following description will be given taking the charge optimization parameter as the current parameter: the battery management system 420 sends a charging request to the controller 430, where the charging request includes: and charging to optimize current parameters. The controller 430 sends the charging request to the power supply device, the power supply device receives the charging request sent by the controller 430 of the energy storage power supply system, and outputs the power supply current parameter to the converter system 440 through the charging interface 450, the converter system 440 performs conversion processing on the power supply current parameter output by the power supply device, and outputs the processed power supply current parameter to the energy storage battery 410, so that the energy storage battery 410 is charged with the power supply current parameter output by the power supply device, wherein the power supply current parameter output by the power supply device may be the same as or different from a charging optimization current parameter in the charging request sent by the controller 430 of the energy storage power supply system, and the size of the power supply current parameter output by the power supply device is related to the specification of the power supply device, which is not described herein. The execution process and principle of using the charging optimization parameter as the power parameter and using the charging optimization parameter as the current parameter are the same, and are not described herein again.
And (3) discharging: the battery management system of the load sends a charging request to a controller 430 of the energy storage power system, the charging request includes a charging requirement parameter, the controller 430 sends the charging request to the battery management system 420, after the battery management system 420 receives the charging request sent by the controller 430, the charging and discharging control method of the energy storage power system according to any of the embodiments is executed to obtain a discharging optimization parameter, and the discharging request is sent to the controller 430, wherein the discharging request includes the discharging optimization parameter, and the controller 430 controls the energy storage battery 410 to be discharged to the load through a converter system 440 and a charging gun 460.
Here, the following description will be given by taking the charge optimization parameter as a power parameter: the battery management system of the load sends a charging request to a controller 430 of the energy storage power supply system, the charging request includes a charging demand power parameter, after the controller 430 receives the charging request sent by the load, the charging demand parameter sent by the load is sent to the battery management system 420, after the battery management system 420 receives the charging demand parameter sent by the controller 430, the charging and discharging control method of the energy storage power supply system described in any of the above embodiments is executed to obtain a discharging optimized power parameter, and a discharging request is sent to the controller 430, wherein the discharging request includes a discharging optimized power parameter, the controller 430 controls the energy storage battery 410 to execute a discharging action, the energy storage battery 410 outputs power to the converter system 440, the converter system 440 processes the discharging optimized power parameter output by the energy storage battery 410, and discharges the processed power to the load through a charging gun 460, so that the load is charged with the discharge optimized power parameter output by the energy storage battery 410. The discharge optimized power parameter output by the energy storage battery 410 may be the same as or different from the required power in the charging request of the load, and the discharge optimized power parameter output by the energy storage battery 410 is not described herein again with reference to the foregoing embodiment.
Alternatively, in the embodiment of the present invention, the inverter system 440 in fig. 4, referring to fig. 5, includes: a DC/DC converter 510 and a DC/AC converter 520;
the DC/DC converter 510 is connected between the energy storage battery 410 and the charging gun 460.
The AC side of the DC/AC converter 520 is connected to the charging interface 450, and the DC side of the DC/AC converter 520 is connected to the charging gun 460.
In practical applications, the energy storage battery 410 includes any one of a lithium iron phosphate battery, a ternary battery and a lithium manganate battery.
In practical applications, the energy storage power system may be a mobile energy storage system, such as an energy storage charging vehicle; alternatively, the energy storage power system may be a fixed energy storage system, such as a charging pile. Of course, the mobile energy storage system and the fixed energy storage system may be other devices for implementing power conversion, and this is only an example, and not limited thereto, depending on the specific application environment, and all of them are within the protection scope of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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.
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 (11)
1. A charge-discharge control method of an energy storage power supply system is characterized by being applied to a battery management system of the energy storage power supply system; the charge and discharge control method of the energy storage power supply system comprises the following steps:
according to the total throughput capacity of the energy storage battery and the current accumulated throughput capacity of the energy storage battery, a formula eta =1-C is adoptedn/（k×C0) Or, η =1-B × exp (-Ea/RT) Cn k1Calculating to obtain a derating coefficient of the energy storage battery;
wherein eta is derating coefficient of the energy storage battery, C0Is the total throughput capacity, C, of the energy storage cellnFor the energy storage battery at presentAccumulated throughput capacity, k and k1 are attenuation factors, B is a pre-exponential factor, Ea is activation energy, R is an ideal gas constant, and T is ambient temperature;
determining charge and discharge target parameters of the energy storage battery;
calculating to obtain charge-discharge optimization parameters of the energy storage battery according to the charge-discharge target parameters and the derating coefficient;
and sending the charge-discharge optimization parameters to a controller in the energy storage power supply system so that the energy storage battery is charged and discharged according to the charge-discharge optimization parameters.
2. The charging/discharging control method for the energy storage power supply system according to claim 1, wherein k =5 and k1= 0.5.
3. The energy storage power supply system charge-discharge control method according to claim 1, wherein the determining of the charge-discharge target parameter of the energy storage battery comprises:
acquiring the residual electric quantity SOC and the temperature of the energy storage battery;
and determining the charge and discharge target parameters of the energy storage battery according to the SOC and the temperature and a preset charge and discharge limit value matrix table.
4. The charge and discharge control method of the energy storage power supply system according to claim 3, wherein the obtaining the remaining capacity SOC of the energy storage battery comprises:
and calculating the SOC of the energy storage battery according to an ampere-hour integration method.
5. The energy storage power supply system charge-discharge control method according to claim 1, wherein the charge-discharge optimization parameter of the energy storage battery is calculated according to the charge-discharge target parameter and the derating coefficient, and the formula is as follows:
Q=Q0*η；
wherein Q is the charge-discharge optimization parameter, Q0To said charging and dischargingAnd the target parameter eta is the derating coefficient.
6. The energy storage power supply system charge-discharge control method according to claim 1, wherein the charge-discharge target parameter and the charge-discharge optimization parameter are both: a current parameter, or, a power parameter.
7. The method for controlling charging and discharging of the energy storage power supply system according to any one of claims 1 to 6, wherein if the energy storage battery is about to enter a discharging state, before sending the charging and discharging optimization parameter to the controller in the energy storage power supply system, the method further comprises:
receiving a charging demand parameter sent by a load through the controller;
judging whether the charging demand parameter is smaller than the charging and discharging optimization parameter;
and if the charging demand parameter is smaller than the charging and discharging optimization parameter, updating the charging and discharging optimization parameter by the charging demand parameter.
8. An energy storage power supply system, comprising: the system comprises an energy storage battery, a battery management system, a controller, a converter system, a charging interface and a charging gun; wherein:
the first end of the converter system is connected with the charging interface;
the second end of the converter system is connected with the energy storage battery;
the third end of the converter system is connected with a battery of a load through the charging gun;
the battery management system is used for detecting and recording the operating parameters of the energy storage battery and executing the charge and discharge control method of the energy storage power supply system according to any one of claims 1 to 7;
and the controller is respectively connected with the control end of the converter system, the battery management system and the battery management system of the load.
9. The energy storage power supply system of claim 8, wherein the converter system comprises: a DC/DC converter and a DC/AC converter;
the DC/DC converter is connected between the energy storage battery and the charging gun;
the alternating current side of the DC/AC converter is connected with the charging interface, and the direct current side of the DC/AC converter is connected with the charging gun.
10. The energy storage power supply system according to claim 8, wherein the energy storage battery comprises: any one of a lithium iron phosphate battery, a ternary battery and a lithium manganate battery.
11. The energy storage power supply system according to claim 8, wherein the energy storage power supply system is a mobile energy storage power supply system or a stationary energy storage power supply system.
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| CN111916871B (en) * | 2020-07-16 | 2021-09-14 | 合肥阳光新能源科技有限公司 | Temperature control method, energy storage discharge control method and energy storage application system for energy storage battery compartment |
| CN112327735B (en) * | 2020-10-29 | 2022-03-01 | 深圳市汇顶科技股份有限公司 | Industrial control system protection method, device, equipment and storage medium thereof |
| US11789087B2 (en) * | 2021-03-03 | 2023-10-17 | Semiconductor Components Industries, Llc | Battery charge support system for reducing energy loss |
| CN113352937B (en) * | 2021-06-02 | 2023-04-11 | 国网智慧能源交通技术创新中心(苏州)有限公司 | Electric automobile charging and discharging control method based on V2G charging system |
| CN116230038B (en) * | 2022-11-01 | 2024-03-08 | 广州星翼智慧能源技术有限公司 | Energy storage system charge and discharge control method, system, equipment and storage medium |
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