CN111211365B - Multi-energy-storage battery system and control method thereof - Google Patents

Multi-energy-storage battery system and control method thereof Download PDF

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CN111211365B
CN111211365B CN202010039780.6A CN202010039780A CN111211365B CN 111211365 B CN111211365 B CN 111211365B CN 202010039780 A CN202010039780 A CN 202010039780A CN 111211365 B CN111211365 B CN 111211365B
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energy storage
storage battery
power
main energy
distributed
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CN111211365A (en
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王贺武
邢伟
卢兰光
欧阳明高
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Tsinghua University
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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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • 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
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • 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

Abstract

The application relates to a multi-energy-storage battery system and a control method thereof. The control method comprises the step of finding the distributed energy storage batteries needing to be charged and discharged from the plurality of distributed energy storage batteries to obtain the total power demand of the power of each distributed energy storage battery needing to be charged and discharged. And if the total power demand is the total charging power demand, obtaining the maximum discharging power of the main energy storage battery. And further judging whether the total charging power is less than or equal to the maximum discharging power of the main energy storage battery. And if so, charging the distributed energy storage batteries by the main energy storage battery. The control method of the multi-energy-storage-battery system firstly charges the distributed energy storage batteries through the main energy storage battery. Even if the external system is powered off, the distributed energy storage batteries can still obtain electric energy. The main energy storage battery plays a role in electric power buffering, and the dependence of the distributed energy storage batteries on an external system is reduced.

Description

Multi-energy-storage battery system and control method thereof
Technical Field
The present disclosure relates to the field of power technologies, and in particular, to a multi-energy-storage battery system and a control method thereof.
Background
With the increasing demand for the quality of electric energy, the energy storage technology has been rapidly developed. Energy storage batteries are widely used in various power systems. The increase of energy storage battery can reduce the impact to outside electric energy quality to and alleviate the unbalance of peak valley power consumption, discharge through the energy storage can continue to maintain the electric energy demand of system even under the circumstances that external electric energy supply is not enough, strengthened the inside stability of system.
The energy storage battery typically draws power from an external system for charging the electrical device. However, when the external system is powered off, the energy storage battery cannot obtain electric energy in time. The existing energy storage battery has large dependence on an external system and poor impact resistance.
Disclosure of Invention
Therefore, it is necessary to provide a multi-energy-storage-battery system and a control method thereof, aiming at solving the problems of high dependence of the energy storage battery on an external system and poor impact resistance.
A control method of a multi-energy-storage battery system comprises a plurality of distributed energy storage batteries, a main energy storage battery and a direct current bus. The plurality of distributed energy storage batteries and the main energy storage battery are respectively connected with the direct current bus. The direct current bus is used for being connected with an external system. The control method comprises the following steps:
and S100, finding the distributed energy storage battery needing to be charged and discharged from the plurality of distributed energy storage batteries. And respectively obtaining the power of each distributed energy storage battery needing to be charged and discharged. And summing the power of the plurality of distributed energy storage batteries to obtain the total required power.
S200, acquiring the SOC of the main energy storage battery and the SOC of the main energy storage batteryminAnd SOC of the main energy storage batterymax. Judging whether the SOC of the main energy storage battery is in the SOC of the main energy storage batteryminAnd SOC of the main energy storage batterymaxIn the meantime.
And S300, if so, judging whether the total required power is total required discharging power or total required charging power.
And S400, if the total power demand is the total charging power demand. And acquiring the maximum discharge power of the main energy storage battery.
And S500, judging whether the total required charging power is less than or equal to the maximum discharging power of the main energy storage battery.
And S600, if yes, charging the distributed energy storage batteries by the main energy storage battery.
In one embodiment, after S500, the method for controlling a multi-energy-storage battery system further includes:
and S510, if not, the main energy storage battery charges the distributed energy storage batteries according to the maximum discharge power of the main energy storage battery, and the external system charges the distributed energy storage batteries according to the difference power between the total required charge power and the maximum discharge power of the main energy storage battery.
In one embodiment, after S300, the method for controlling a multi energy storage battery system further includes:
and S310, if the total required power is the total required discharge power, acquiring the maximum charging power of the main energy storage battery.
And S320, judging whether the maximum charging power of the main energy storage battery is greater than or equal to the total discharge power.
And S330, if yes, charging the main energy storage battery by the distributed energy storage batteries.
In one embodiment, after S310, the method for controlling a multi energy storage battery system further includes:
and S321, if not, the distributed energy storage batteries charge the main energy storage battery with the maximum charging power of the main energy storage battery, and the distributed energy storage batteries discharge to the external system with the difference power between the maximum charging power of the main energy storage battery and the total discharge power.
In one embodiment, after S200, the method for controlling a multi-energy-storage battery system further includes:
and S201, if yes, and the total power requirement is 0, the distributed energy storage batteries are charged and discharged mutually.
In one embodiment, after S200, the method for controlling a multi-energy-storage battery system further includes:
s210, if not, judging whether the SOC of the main energy storage battery is smaller than the SOC of the main energy storage battery or notmin。
And S220, if so, acquiring the maximum charging power of the main energy storage battery.
And S230, judging whether the total power demand is total discharge power or total charging power.
And S240, if the total power demand is total charging power demand, the external system charges the distributed energy storage batteries and the main energy storage battery.
In one embodiment, after S230, further comprising:
and S231, if the total required power is the total required discharge power, judging whether the total required discharge power is greater than or equal to the maximum charging power of the main energy storage battery.
And S232, if yes, the distributed energy storage batteries charge the main energy storage battery by using the maximum charging power of the main energy storage battery, and the distributed energy storage batteries discharge to the external system by using the difference power of the total discharge power required and the maximum charging power of the main energy storage battery.
In one embodiment, after S231, the method for controlling a multi energy storage battery system further includes:
and S1, if not, the distributed energy storage batteries charge the main energy storage battery, and the external system charges the main energy storage battery by the difference power of the total discharge power and the maximum charging power of the main energy storage battery.
In one embodiment, after S210, the method for controlling a multi energy storage battery system further includes:
s211, if not, the SOC of the main energy storage battery is larger than that of the main energy storage batterymaxAnd acquiring the maximum discharge power of the main energy storage battery.
And S212, judging whether the total power demand is total discharge power or total charging power.
And S213, if the total power demand is total discharge power demand, discharging the distributed energy storage batteries and the main energy storage battery to the external system.
In one embodiment, after S212, the method for controlling a multi-energy-storage battery system further includes:
and S2121, if the total required power is the total required charging power, judging whether the total required charging power is less than or equal to the maximum discharging power of the main energy storage battery.
And S2122, if yes, the main energy storage battery discharges to the plurality of distributed energy storage batteries with the total charging power, and the main energy storage battery discharges to the external system with the difference power between the maximum discharging power and the total charging power of the main energy storage battery.
In one embodiment, after S2121, the method for controlling a multi-energy-storage battery system further includes:
and S2123, if not, the main energy storage battery discharges to the plurality of distributed energy storage batteries with the maximum discharge power of the main energy storage battery, and the external system discharges to charge the plurality of distributed energy storage batteries with the difference power between the total required charge power and the maximum discharge power of the main energy storage battery.
In one embodiment, before S100, the method for controlling a multi-energy-storage battery system further includes:
s010, respectively obtaining the SOC of each distributed energy storage battery and the SOC of each distributed energy storage batteryminAnd SOC of the distributed energy storage batterymaxAnd according to the SOC of each distributed energy storage battery and the SOC of the distributed energy storage batteryminAnd SOC of the distributed energy storage batterymaxAnd judging whether the distributed energy storage battery needs to be charged and discharged.
In one embodiment, the step of obtaining the power of each distributed energy storage battery needing to be charged and discharged in S100 includes:
acquiring the SOP of each distributed energy storage battery;
and obtaining the power of each distributed energy storage battery needing to be charged and discharged according to the SOP of each distributed energy storage battery.
In one embodiment, in S400, the step of obtaining the maximum discharge power of the main energy storage battery includes:
acquiring the SOP of the main energy storage battery;
and obtaining the maximum discharge power of the main energy storage battery according to the SOP of the main energy storage battery.
A multi-energy-storage battery system comprises a plurality of distributed energy storage battery units, a main energy storage battery unit, a direct current bus and an EMS. The plurality of distributed energy storage battery units are used for providing electric energy for electric equipment or providing an energy storage battery pack. The direct current bus is used for being connected with an external system. The distributed energy storage battery units and the main energy storage battery unit are respectively connected with the direct current bus. The bidirectional DC/AC converter is used for being connected between the external system and the direct current bus. The plurality of distributed energy storage battery units, the main energy storage battery unit and the bidirectional DC/AC converter are respectively communicated with the EMS. The EMS is used for controlling the main energy storage battery unit to firstly charge and discharge a plurality of distributed energy storage battery units. When the main energy storage battery unit cannot meet the charging and discharging requirements of the plurality of distributed energy storage battery units, the EMS controls the external system to charge and discharge the plurality of distributed energy storage battery units or the main energy storage battery unit through the bidirectional DC/AC converter.
In one embodiment, the distributed energy storage battery unit includes a distributed energy storage battery, a bidirectional DC/DC converter of the distributed energy storage battery, and a BMS of the distributed battery. The bidirectional DC/DC converter of the distributed energy storage battery is connected between the distributed energy storage battery and the direct current bus. And the bidirectional DC/DC converter of the distributed energy storage battery is in communication connection with the EMS. The EMS is in communication connection with the BMS of the distributed battery. The BMS of the distributed battery is used for collecting the terminal voltage and the current of the distributed energy storage battery and obtaining the SOC, the SOP and the SOH of the distributed energy storage battery according to the terminal voltage and the current of the distributed energy storage battery. The BMS of the distributed battery transmits the SOC, SOP, and SOH of the distributed energy storage battery to the EMS.
In one embodiment, the main energy storage battery unit comprises a main energy storage battery, a bidirectional DC/DC converter of the main energy storage battery, and a BMS of the main energy storage battery. The bidirectional DC/DC converter of the main energy storage battery is connected between the main energy storage battery and the direct current bus. And the bidirectional DC/DC converter of the main energy storage battery is communicated with the EMS. The EMS is in communication connection with the BMS of the main energy storage battery. The BMS of the main energy storage battery is used for acquiring the terminal voltage and the current of the main energy storage battery and obtaining the SOC, the SOP and the SOH of the main energy storage battery according to the terminal voltage and the current of the main energy storage battery. The BMS of the main energy storage battery outputs the SOC, the SOP and the SOH of the main energy storage battery to the EMS. The EMS controls the charging and discharging of the main energy storage battery and the plurality of distributed energy storage batteries through the bidirectional DC/DC converter of the distributed energy storage batteries, the bidirectional DC/DC converter of the main energy storage battery and the bidirectional DC/AC converter.
According to the control method of the multi-energy-storage-battery system, when the total required charging power is smaller than or equal to the maximum discharging power of the main energy storage battery, the main energy storage battery firstly charges the plurality of distributed energy storage batteries. Even if the external system is powered off, the distributed energy storage batteries can still obtain electric energy. The main energy storage battery plays a role in electric power buffering, and the dependence of the distributed energy storage batteries on an external system is reduced.
Drawings
Fig. 1 is a schematic flow chart of a control method of the multi-energy storage battery system provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of the multi-energy storage battery system provided in an embodiment of the present application.
Reference numerals:
multiple energy storage battery system 10
Electric equipment 110
External system 120
Distributed energy storage battery cell 20
Main energy storage battery unit 30
DC bus 40
Bidirectional DC/AC converter 50
EMS60
Distributed energy storage battery 210
Bidirectional DC/DC converter 220 for distributed energy storage battery
BMS230 of distributed batteries
Main energy storage battery 310
Bidirectional DC/DC converter 320 for main energy storage battery
BMS330 of main energy storage battery
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
The numbering of the components as such, e.g., "first", "second", etc., is used herein for the purpose of describing the objects only, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In a battery system, SOH is the state of health of the battery, SOP is the power state of the battery, and SOC is the state of charge of the battery. The SOP includes a maximum charging power and a maximum discharging power. The EMS is an energy management system. The BMS is a battery management system.
Referring to fig. 1, an embodiment of the present application provides a control method for a multi-energy-storage battery system 10, where the multi-energy-storage battery system 10 includes a plurality of distributed energy-storage batteries 210, a main energy-storage battery 310, and a dc bus 40. The plurality of distributed energy storage batteries 210 and the main energy storage battery 310 are respectively connected with the direct current bus 40. The dc bus 40 is used to connect to an external system 120. The control method comprises the following steps:
and S100, finding the distributed energy storage batteries 210 needing to be charged and discharged from the plurality of distributed energy storage batteries 210. And respectively obtaining the power of each distributed energy storage battery 210 needing to be charged and discharged. And summing the power of the plurality of distributed energy storage batteries 210 to obtain the total required power.
And calculating the SOC of the battery by using ampere-hour integration or an estimation method based on a battery model according to the acquired terminal voltage and current signals. And obtaining the SOH of the battery and the SOP of the battery according to the SOC of the battery.
In one embodiment, the internal resistance parameter in the SOH of the battery is derived from the SOC of the battery and a MAP of SOC versus internal resistance. The open-circuit voltage parameter in the SOH is obtained from the SOC of the battery and the MAP graph of the SOC-open-circuit voltage. And obtaining the required charge-discharge power or the maximum charge-discharge power in the SOP according to parameters such as open-circuit voltage, internal resistance, charge cut-off voltage, discharge cut-off voltage and the like and related formulas.
The battery SOC, the required charge-discharge power, or the maximum charge-discharge power may also be obtained by other methods.
In one embodiment, the step of obtaining the power of each distributed energy storage battery 210 that needs to be charged and discharged in S100 is:
and obtaining the power of each distributed energy storage battery 210 needing to be charged and discharged according to the SOP of each distributed energy storage battery 210.
In one embodiment, the power of each distributed energy storage battery 210 requiring charging and discharging is obtained according to the internal resistance, the open-circuit voltage, the discharge cut-off voltage and the charge cut-off voltage of the distributed energy storage battery 210 requiring charging and discharging.
In one embodiment, the power of the energy storage battery is calculated by the following formula.
The maximum charging power is:
Figure BDA0002367317120000091
wherein, PchaFor charging power, UchaFor the charge cut-off voltage, OCV is an open-circuit voltage, and R is an internal resistance.
Figure BDA0002367317120000092
Wherein, UdchIs the discharge cut-off voltage, PdchIs the charging power.
In the step of summing the powers to obtain the total power demand in S100, if the distributed energy storage battery 210 is in a discharge state, a symbol is added before the maximum discharge power. I.e. negative for discharge and positive for charge.
When the distributed energy storage battery 210 needs to be discharged, the power is obtained by equation (2). When the distributed energy storage battery 210 needs to be charged, the power is obtained by equation (1).
When the main energy storage battery 310 needs to be discharged, the maximum discharge power of the main energy storage battery 310 is obtained by equation (2). When the main energy storage battery 310 needs to be charged, the power is obtained by equation (1).
S200, acquiring the SOC of the main energy storage battery 310 and the SOC of the main energy storage battery 310minAnd the SOC of the main energy storage battery 310max. Determining whether the SOC of the main energy storage battery 310 is the SOC of the main energy storage battery 310minAnd the main energy storage battery 310SOCmaxIn the meantime.
Wherein SOC is the state of charge of the battery.
And S300, if so, judging whether the total required power is total required discharging power or total required charging power.
And S400, if the total power demand is the total charging power demand. The maximum discharge power of the main energy storage battery 310 is obtained.
In one embodiment, in S400, the step of obtaining the maximum discharge power of the main energy storage battery 310 includes:
the SOP of the main energy storage cell 310 is obtained.
The maximum discharge power of the main energy storage battery 310 is obtained according to the SOP of the main energy storage battery 310.
In one embodiment, the maximum discharge power of the main energy storage battery 310 is obtained according to the internal resistance of the main energy storage battery 310, the open-circuit voltage of the main energy storage battery 310, and the discharge cutoff voltage of the main energy storage battery 310.
S500, determining whether the total required charging power is less than or equal to the maximum discharging power of the main energy storage battery 310.
S600, if yes, the main energy storage battery 310 charges the plurality of distributed energy storage batteries 210.
In the control method of the multi-energy-storage-battery system 10 provided in the embodiment of the present application, when the total required charging power is less than or equal to the maximum discharging power of the main energy-storage battery 310, the control method of the multi-energy-storage-battery system 10 first charges the plurality of distributed energy-storage batteries 210 through the main energy-storage battery 310. Even if the external system is powered off, the plurality of distributed energy storage batteries 210 can still obtain electric energy. The main energy storage battery 310 plays a role in buffering power, and the dependence of the plurality of distributed energy storage batteries 310 on an external system is reduced.
In one embodiment, after S500, the control method of the multi energy storage battery system 10 further includes:
s510, if not, the main energy storage battery 310 charges the plurality of distributed energy storage batteries 210 according to the maximum discharge power of the main energy storage battery 310, and the external system 120 charges the plurality of distributed energy storage batteries 210 according to the difference power between the total required charge power and the maximum discharge power of the main energy storage battery 310.
In one embodiment, after S300, the method for controlling the multi-energy-storage-battery system 10 further includes:
and S310, if the total required power is the total required discharge power, acquiring the maximum charging power of the main energy storage battery 310.
In one embodiment, the step of obtaining the maximum charging power of the main energy storage battery 310 in S310 is:
the SOP of the main energy storage cell 310 is obtained.
The maximum charging power of the main energy storage battery 310 is obtained according to the SOP of the main energy storage battery 310.
In one embodiment, the maximum charging power of the main energy storage battery 310 is obtained according to the internal resistance of the main energy storage battery 310, the open-circuit voltage of the main energy storage battery 310 and the charging cut-off voltage of the main energy storage battery 310.
S320, determining whether the maximum charging power of the main energy storage battery 310 is greater than or equal to the total discharging power.
S330, if yes, the distributed energy storage batteries 210 charge the main energy storage battery 310.
In one embodiment, after S320, the control method of the multi energy storage battery system 10 further includes:
s321, if not, the plurality of distributed energy storage batteries 210 charge the main energy storage battery 310 with the maximum charging power of the main energy storage battery 310, and the plurality of distributed energy storage batteries 210 discharge to the external system 120 with the difference power between the maximum charging power of the main energy storage battery 310 and the total discharge power.
If the maximum charging power of the main energy storage battery 310 is less than the total discharge power. A part of the electric energy of the plurality of distributed energy storage batteries 210 is used for charging the main energy storage battery 310, and the rest of the electric energy is used for discharging to the external system 120.
In one embodiment, after S200, the control method of the multi energy storage battery system 10 further includes:
and S201, if yes, and the total power requirement is 0, the distributed energy storage batteries 210 are charged and discharged mutually. There are two cases where the total power demand is 0: the plurality of distributed energy storage batteries 210 do not need to be charged and discharged; some of the distributed energy storage batteries 210 need to be charged and discharged, and when the distributed energy storage batteries 210 need to be charged and discharged, the electric quantity can be internally coordinated, and the coordination between the main energy storage battery 310 and the external system 120 is not needed.
In one embodiment, after S200, the control method of the multi energy storage battery system 10 further includes:
s210, if not, judging whether the SOC of the main energy storage battery 310 is smaller than the SOC of the main energy storage battery 310min。
And S220, if so, acquiring the maximum charging power of the main energy storage battery 310.
In one embodiment, the step of obtaining the maximum charging power of the main energy storage battery 310 includes:
the SOP of the main energy storage cell 310 is obtained.
The maximum charging power of the main energy storage battery 310 is obtained according to the SOP of the main energy storage battery 310.
In one embodiment, the maximum charging power of the main energy storage battery 310 is obtained according to the internal resistance of the main energy storage battery 310, the open-circuit voltage of the main energy storage battery 310 and the charging cut-off voltage of the main energy storage battery 310.
And S230, judging whether the total power demand is total discharge power or total charging power.
S240, if the total power demand is total charging power demand, the external system 120 charges the distributed energy storage batteries 210 and the main energy storage battery 310.
In one embodiment, after S230, further comprising:
s231, if the total required power is the total required discharge power, determining whether the total required discharge power is greater than or equal to the maximum charging power of the main energy storage battery 310.
S232, if yes, the plurality of distributed energy storage batteries 210 charge the main energy storage battery 310 with the maximum charging power of the main energy storage battery 310, and the plurality of distributed energy storage batteries 210 discharge to the external system 120 with the difference power between the total discharge power required and the maximum charging power of the main energy storage battery 310.
In one embodiment, after S231, the method for controlling the multi-energy-storage-battery system 10 further includes:
s1, if not, the distributed energy storage batteries 210 charge the main energy storage battery 310, and the external system 120 charges the main energy storage battery 310 with a difference between the total required discharge power and the maximum charging power of the main energy storage battery 310.
In one embodiment, after S210, the method for controlling the multi energy storage battery system 10 further includes:
s211, if not, the SOC of the main energy storage battery 310 is greater than the SOC of the main energy storage battery 310maxAnd obtaining the maximum discharge power of the main energy storage battery 310.
In one embodiment, obtaining the maximum discharge power of the main energy storage battery 310 in S211 includes:
the SOP of the main energy storage cell 310 is obtained.
The maximum discharge power of the main energy storage battery 310 is obtained according to the SOP of the main energy storage battery 310.
In one embodiment, the maximum discharge power of the main energy storage battery 310 is obtained according to the SOC of the main energy storage battery 310, the internal resistance of the main energy storage battery 310, the open-circuit voltage of the main energy storage battery 310, and the discharge cutoff voltage of the main energy storage battery 310.
And S212, judging whether the total power demand is total discharge power or total charging power.
S213, if the total power demand is a total discharge power demand, the distributed energy storage batteries 210 and the main energy storage battery 310 discharge to the external system 120.
In one embodiment, after S212, the method for controlling the multi-energy-storage-battery system 10 further includes:
s2121, if the total required power is the total required charging power, determining whether the total required charging power is less than or equal to the maximum discharging power of the main energy storage battery 310.
S2122, if yes, the main energy storage battery 310 discharges to the plurality of distributed energy storage batteries 210 with the total required charging power, and the main energy storage battery 310 discharges to the external system 120 with a difference power between the maximum discharging power of the main energy storage battery 310 and the total required charging power.
In one embodiment, after S2121, the method for controlling the multi-energy-storage battery system 10 further includes:
s2123, if not, the main energy storage battery 310 discharges to the plurality of distributed energy storage batteries 210 with the maximum discharge power of the main energy storage battery 310, and the external system 120 discharges to charge the plurality of distributed energy storage batteries 210 with the difference power between the total required charge power and the maximum discharge power of the main energy storage battery 310.
In one embodiment, before S100, the method for controlling the multi-energy-storage battery system 10 further includes:
s010, respectively obtaining the SOC of each distributed energy storage battery 210 and the SOC of each distributed energy storage battery 210minAnd the SOC of the distributed energy storage cell 210maxAccording to the SOC of each distributed energy storage battery 210 and the SOC of the distributed energy storage battery 210minAnd the SOC of the distributed energy storage cell 210maxAnd judging whether the distributed energy storage battery 210 needs to be charged and discharged.
In one embodiment, when the multi-energy storage battery system is overhauled and the special working condition thereof or set by people, the EMS may control the main energy storage battery 310 or the distributed energy storage battery 210 needing to be overhauled to discharge to the SOCminOr the following.
When the electricity rate of the external system 120 is lower than the usual electricity rate, the EMS controls the main energy storage battery 310 or the distributed energy storage battery 210 to be charged toSOCmaxThe state of charge of (c).
Referring to fig. 2, the present embodiment provides a multi-energy storage battery system 10, which includes a plurality of distributed energy storage battery units 20, a main energy storage battery unit 30, a dc bus 40, and an EMS 60. The plurality of distributed energy storage battery cells 20 are used to provide electrical energy to the electrical devices 110 or loads. The dc bus 40 is used to connect to an external system 120. The plurality of distributed energy storage battery units 20 and the main energy storage battery unit 30 are respectively connected with the direct current bus 40. The bi-directional DC/AC converter 50 is configured to be connected between the external system 120 and the DC bus 40. The distributed energy storage battery units 20, the main energy storage battery unit 30 and the bidirectional DC/AC converter 50 are respectively connected to the EMS60 in communication. The EMS60 is used to control the main energy storage battery unit 30 to charge and discharge the distributed energy storage battery units 20 first. When the main energy storage battery unit 30 cannot meet the charging and discharging requirements of the plurality of distributed energy storage battery units 20, the EMS60 controls the external system 120 to charge and discharge the plurality of distributed energy storage battery units 20 or the main energy storage battery unit 30 through the bidirectional DC/AC converter 50.
According to the multi-energy-storage-battery system 10 provided by the embodiment of the application, even if an external system is powered off, the distributed energy storage batteries 210 can still obtain electric energy. The main energy storage battery 310 plays a role in buffering power, and the dependence of the plurality of distributed energy storage batteries 310 on an external system is reduced.
In fig. 2, the EMS is an energy management system. The battery management system connected to the main energy storage battery 310 is a BMS330 of the main energy storage battery. The battery management system connected to the distributed energy storage battery 210 is the BMS230 of the distributed battery.
In one embodiment, the distributed energy storage battery unit 20 includes a distributed energy storage battery 210, a bidirectional DC/DC converter 220 of the distributed energy storage battery 210, and a BMS230 of the distributed battery. The bidirectional DC/DC converter 220 of the distributed energy storage battery 210 is connected between the distributed energy storage battery 210 and the DC bus 40. The bidirectional DC/DC converter 220 of the distributed energy storage battery 210 is communicatively coupled to the EMS 60. The EMS60 is communicatively coupled to the BMS230 of the distributed battery. The BMS230 of the distributed battery is configured to collect terminal voltage and current of the distributed energy storage battery 210, and obtain SOC, SOP, and SOH of the distributed energy storage battery 210 according to the terminal voltage and current of the distributed energy storage battery 210. The BMS230 of the distributed battery delivers the SOC, SOP, and SOH of the distributed energy storage battery 210 to the EMS 60.
And calculating the SOC of the battery by using ampere-hour integration or an estimation method based on a battery model according to the acquired terminal voltage and current signals. And obtaining the SOH of the battery and the SOP of the battery according to the SOC of the battery.
In one embodiment, the internal resistance parameter in the SOH of the battery is derived from the SOC of the battery and a MAP of SOC versus internal resistance. The open-circuit voltage parameter in the SOH is obtained from the SOC of the battery and the MAP graph of the SOC-open-circuit voltage. And obtaining the required charge-discharge power or the maximum charge-discharge power in the SOP according to parameters such as open-circuit voltage, internal resistance, charge cut-off voltage, discharge cut-off voltage and the like and related formulas.
The battery SOC, the required charge-discharge power, or the maximum charge-discharge power may also be obtained by other methods.
In one embodiment, the main energy storage battery unit 30 includes a main energy storage battery 310, a bidirectional DC/DC converter 320 of the main energy storage battery 310, and a BMS330 of the main energy storage battery. The bidirectional DC/DC converter 320 of the main energy storage battery 310 is connected between the main energy storage battery 310 and the DC bus 40. The bi-directional DC/DC converter 320 of the main energy storage battery 310 communicates with the EMS 60. The EMS60 is communicatively coupled to the BMS330 of the primary energy storage battery. The BMS330 of the main energy storage battery is configured to collect the terminal voltage and the current of the main energy storage battery 310, and obtain the SOC, the SOP, and the SOH of the main energy storage battery 310 according to the terminal voltage and the current of the main energy storage battery 310. The BMS330 of the main energy storage battery outputs the SOC, SOP, and SOH of the main energy storage battery 310 to the EMS 60. The EMS60 controls the charging and discharging of the main energy storage battery 310 and the plurality of distributed energy storage batteries 210 through the bidirectional DC/DC converter 220 of the distributed energy storage batteries 210, the bidirectional DC/DC converter 320 of the main energy storage battery 310, and the bidirectional DC/AC converter 50.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-described examples merely represent several embodiments of the present application and are not to be construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (17)

1. A control method of a multi-energy storage battery system, wherein the multi-energy storage battery system (10) comprises a plurality of distributed energy storage batteries (210), a main energy storage battery (310) and a dc bus (40), the plurality of distributed energy storage batteries (210) and the main energy storage battery (310) are respectively connected with the dc bus (40), and the dc bus (40) is used for being connected with an external system (120), the control method comprising:
s100, finding the distributed energy storage batteries (210) needing to be charged and discharged from the distributed energy storage batteries (210), respectively obtaining the power of each distributed energy storage battery (210) needing to be charged and discharged, and summing the power of the distributed energy storage batteries (210) to obtain the total required power;
s200, acquiring the SOC of the main energy storage battery (310) and the SOC of the main energy storage battery (310)minAnd the SOC of the main energy storage battery (310)maxJudging whether the SOC of the main energy storage battery (310) is in the SOC of the main energy storage battery (310)minAnd the SOC of the main energy storage battery (310)maxTo (c) to (d);
s300, if yes, judging whether the total required power is total required discharging power or total required charging power;
s400, if the total power demand is the total charging power demand, acquiring the maximum discharging power of the main energy storage battery (310);
s500, judging whether the total charging power is less than or equal to the maximum discharging power of the main energy storage battery (310);
and S600, if yes, charging the distributed energy storage batteries (210) by the main energy storage battery (310).
2. The method for controlling a multi-energy-storage-battery system according to claim 1, further comprising, after S500:
and S510, if not, the main energy storage battery (310) charges the distributed energy storage batteries (210) according to the maximum discharge power of the main energy storage battery (310), and the external system (120) charges the distributed energy storage batteries (210) according to the difference power between the total required charge power and the maximum discharge power of the main energy storage battery (310).
3. The method for controlling a multi-energy-storage-battery system according to claim 1, further comprising, after S300:
s310, if the total required power is the total required discharge power, acquiring the maximum charging power of the main energy storage battery (310);
s320, judging whether the maximum charging power of the main energy storage battery (310) is larger than or equal to the total discharge power;
and S330, if yes, charging the main energy storage battery (310) by the plurality of distributed energy storage batteries (210).
4. The method for controlling a multi-energy-storage-battery system according to claim 3, further comprising, after S320:
s321, if not, the distributed energy storage batteries (210) charge the main energy storage battery (310) with the maximum charging power of the main energy storage battery (310), and the distributed energy storage batteries (210) discharge to the external system (120) with the difference power between the maximum charging power of the main energy storage battery (310) and the total discharge power.
5. The method for controlling a multi-energy-storage-battery system according to claim 1, further comprising, after S200:
and S201, if yes, and the total power requirement is 0, the distributed energy storage batteries (210) are charged and discharged mutually.
6. The method for controlling a multi-energy-storage-battery system according to claim 1, further comprising, after S200:
s210, if not, judging whether the SOC of the main energy storage battery (310) is smaller than that of the main energy storage battery (310)min；
S220, if yes, acquiring the maximum charging power of the main energy storage battery (310);
s230, judging whether the total power demand is total discharge power demand or total charge power demand;
and S240, if the total power demand is total charging power demand, the external system (120) charges the distributed energy storage batteries (210) and the main energy storage battery (310).
7. The method for controlling a multi-energy-storage-battery system according to claim 6, further comprising, after S230:
s231, if the total required power is total required discharge power, judging whether the total required discharge power is larger than or equal to the maximum charging power of the main energy storage battery (310);
and S232, if yes, the distributed energy storage batteries (210) charge the main energy storage battery (310) by using the maximum charging power of the main energy storage battery (310), and the distributed energy storage batteries (210) discharge to the external system (120) by using the difference power between the total discharge power and the maximum charging power of the main energy storage battery (310).
8. The method for controlling a multi-energy-storage-battery system according to claim 7, further comprising, after S231:
s1, if not, the distributed energy storage batteries (210) charge the main energy storage battery (310), and the external system (120) charges the main energy storage battery (310) by the difference power between the total discharge power and the maximum charging power of the main energy storage battery (310).
9. The method for controlling a multi-energy-storage-battery system according to claim 6, further comprising, after S210:
s211, if not, the SOC of the main energy storage battery (310) is larger than the SOC of the main energy storage battery (310)maxAcquiring the maximum discharge power of the main energy storage battery (310);
s212, judging whether the total power demand is total discharge power demand or total charge power demand;
and S213, if the total power demand is total discharge power demand, discharging the distributed energy storage batteries (210) and the main energy storage battery (310) to the external system (120).
10. The method for controlling a multi-energy-storage-battery system according to claim 9, further comprising, after S212:
s2121, if the total required power is total required charging power, judging whether the total required charging power is less than or equal to the maximum discharging power of the main energy storage battery (310);
and S2122, if yes, the main energy storage battery (310) discharges to the plurality of distributed energy storage batteries (210) with the total required charging power, and the main energy storage battery (310) discharges to the external system (120) with the difference power between the maximum discharging power and the total required charging power of the main energy storage battery (310).
11. The method for controlling a multi-energy-storage-battery system according to claim 10, further comprising, after S2121:
and S2123, if not, discharging the main energy storage battery (310) to the plurality of distributed energy storage batteries (210) by using the maximum discharge power of the main energy storage battery (310), and charging the plurality of distributed energy storage batteries (210) by discharging the external system (120) by using the difference power between the total required charging power and the maximum discharge power of the main energy storage battery (310).
12. The method for controlling a multi-energy-storage-battery system according to claim 1, further comprising, before S100:
s010, the SOC of each distributed energy storage battery (210) and the SOC of each distributed energy storage battery (210) are respectively obtainedminAnd SOC of the distributed energy storage battery (210)maxAccording to the SOC of each distributed energy storage battery (210) and the SOC of the distributed energy storage battery (210)minAnd SOC of the distributed energy storage battery (210)maxAnd judging whether the distributed energy storage battery (210) needs to be charged and discharged.
13. The control method of the multi-energy-storage-battery system according to claim 1, wherein the step of obtaining the power of each distributed energy storage battery (210) requiring charging and discharging in S100 comprises:
acquiring the SOP of each distributed energy storage battery (210);
and obtaining the power of each distributed energy storage battery (210) needing to be charged and discharged according to the SOP of each distributed energy storage battery (210).
14. The control method of a multi energy storage battery system according to claim 1, wherein in S400, the step of obtaining the maximum discharge power of the main energy storage battery (310) comprises:
acquiring the SOP of the main energy storage battery (310);
and obtaining the maximum discharge power of the main energy storage battery (310) according to the SOP of the main energy storage battery (310).
15. A multi-energy storage battery system, comprising:
a plurality of distributed energy storage battery units (20) for providing electrical energy to the electrical consumer (110);
a main energy storage battery cell (30);
a direct current bus (40), wherein the direct current bus (40) is used for connecting with an external system (120), and the plurality of distributed energy storage battery units (20) and the main energy storage battery unit (30) are respectively connected with the direct current bus (40);
a bidirectional DC/AC converter (50) for connection between the external system (120) and the DC bus (40); and
the distributed energy storage battery unit comprises an EMS (60), wherein the distributed energy storage battery units (20), the main energy storage battery unit (30) and the bidirectional DC/AC converter (50) are respectively in communication connection with the EMS (60), the EMS (60) is used for controlling the main energy storage battery unit (30) to firstly charge the distributed energy storage battery units (20) or controlling the distributed energy storage battery units (20) to firstly discharge to the main energy storage battery unit (30), and when the main energy storage battery unit (30) cannot meet the charging and discharging requirements of the distributed energy storage battery units (20), the EMS (60) controls the external system (120) to be charged and discharged by the distributed energy storage battery units (20) or the main energy storage battery unit (30) through the bidirectional DC/AC converter (50).
16. The multi-energy-storage battery system of claim 15, wherein the distributed energy storage battery unit (20) comprises:
a distributed energy storage battery (210);
the bidirectional DC/DC converter (220) of the distributed energy storage battery (210) is connected between the distributed energy storage battery (210) and the direct current bus (40), and the bidirectional DC/DC converter (220) of the distributed energy storage battery (210) is in communication connection with the EMS (60);
the BMS (230) of the distributed battery is connected with the EMS (60) in a communication mode, the BMS (230) of the distributed battery is used for collecting the terminal voltage and the current of the distributed energy storage battery (210) and obtaining the SOC, the SOP and the SOH of the distributed energy storage battery (210) according to the terminal voltage and the current of the distributed energy storage battery (210), and the BMS (230) of the distributed battery is used for conveying the SOC, the SOP and the SOH of the distributed energy storage battery (210) to the EMS (60).
17. The multi energy storage battery system of claim 16, wherein the main energy storage battery unit (30) comprises:
a main energy storage battery (310);
a bidirectional DC/DC converter (320) of a main energy storage battery (310) connected between the main energy storage battery (310) and the DC bus (40), the bidirectional DC/DC converter (320) of the main energy storage battery (310) communicating with the EMS (60);
the battery management system comprises a BMS (330) of a main energy storage battery, wherein the EMS (60) is in communication connection with the BMS (330) of the main energy storage battery, the BMS (330) of the main energy storage battery is used for acquiring the terminal voltage and the current of the main energy storage battery (310), obtaining the SOC, the SOP and the SOH of the main energy storage battery (310) according to the terminal voltage and the current of the main energy storage battery (310) and outputting the SOC, the SOP and the SOH of the main energy storage battery (310) to the EMS (60), and the EMS (60) controls the charging and discharging of the main energy storage battery (310) and a plurality of distributed energy storage batteries (210) through a bidirectional DC/DC converter (220) of the distributed energy storage batteries (210), a bidirectional DC/DC converter (320) of the main energy storage battery (310) and the bidirectional DC/AC converter (50).
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