CN114567045A - Discharging method of parallel energy storage equipment, energy storage inverter and energy storage system - Google Patents

Discharging method of parallel energy storage equipment, energy storage inverter and energy storage system Download PDF

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Publication number
CN114567045A
CN114567045A CN202210255373.8A CN202210255373A CN114567045A CN 114567045 A CN114567045 A CN 114567045A CN 202210255373 A CN202210255373 A CN 202210255373A CN 114567045 A CN114567045 A CN 114567045A
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China
Prior art keywords
power
battery packs
load
output power
battery pack
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CN202210255373.8A
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Chinese (zh)
Inventor
雷健华
秦赓
张华�
唐朝垠
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Shenzhen Poweroak Newener Co Ltd
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Shenzhen Poweroak Newener Co Ltd
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Priority to CN202210255373.8A priority Critical patent/CN114567045A/en
Publication of CN114567045A publication Critical patent/CN114567045A/en
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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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • 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 invention relates to a discharging method of a parallel energy storage device, the energy storage device and an energy storage system, the method comprises the steps of supplying power to a load through the first N battery packs with higher electric quantity, merging the (N + 1) th battery pack until M battery packs are merged when the residual capacity of at least one battery pack in the first N battery packs is equal to the residual capacity of the (N + 1) th battery pack, so that compared with a discharging method for directly putting the M battery packs into use, the discharging method enables the residual capacity of each battery pack to be approximately equal in the discharging process of the battery packs, namely balancing the residual capacity of each battery pack, and achieving a better balanced discharging effect. In addition, each battery pack can be loaded independently, so that the electric quantity balance of each battery pack can be ensured when a user does not need to adopt a pack combining technology, and the use by the user is facilitated.

Description

Discharging method of parallel energy storage equipment, energy storage inverter and energy storage system
Technical Field
The invention relates to the field of energy storage power supplies, in particular to a discharging method of parallel energy storage equipment, an energy storage inverter and an energy storage system.
Background
Along with the improvement of living standard, more and more people are interested in outdoor activities, and in recent years, the energy storage power supply is also more and more favored by people. The demand of the user is also increasing, for example, the user wants the energy storage device to be able to carry a high power device, for example 3000W or 4000W, while generally each battery pack has a maximum output power, for example 1500W. A single battery pack cannot meet the power demand of a high-power load.
In order to implement a high-power device with a load, a plurality of battery packs are generally connected to a host in the conventional manner, a pack combining technique is adopted, and a certain power is output according to the proportion of the remaining power of each battery pack. For example: the 4 battery packs are connected with the host, the maximum output power of each battery pack is 1500W, the residual capacity of each battery pack is 80%, 60%, 40% and 20%, 3000W load needs to be carried, and the output power of each battery pack is 1200W 900W 600W 300W. The energy storage device keeps the residual capacity of the plurality of battery packs at a ratio of 4:3:2:1 throughout the discharging stage.
After the battery pack is discharged for a period of time, the power of the low-power battery pack may be exhausted in advance, and the high-power battery pack still has some remaining power, and at this time, if the user increases the load output power demand, for example, when the battery pack needs to be loaded with 4000W, the power is continuously output according to the remaining power proportion. The battery pack with the maximum remaining capacity needs to output 1600W, and if the maximum remaining capacity exceeds the rated power (maximum output power), 100W more battery packs have to be spread to the remaining 3 battery packs for output, while the battery pack with low capacity may not meet the 100W requirement due to the exhaustion of capacity or less remaining capacity, and thus the large load cannot be normally supplied with power, and the discharge time of the battery pack is reduced.
Disclosure of Invention
The embodiments of the present invention solve at least one of the above technical problems to a certain extent, and therefore the present invention provides a discharging method for a parallel energy storage device, an energy storage inverter and an energy storage system, which can balance the remaining electric quantity of each battery pack in the discharging process, and further can prolong the discharging time of the battery when the output power of the load is increased.
In a first aspect, an embodiment of the present invention provides a discharging method for a parallel energy storage device, where the parallel energy storage device includes M battery packs connected in parallel, where M is greater than or equal to 2, and the method includes:
acquiring the residual capacity and the maximum output power of each battery pack;
sorting the battery packs according to the residual capacity of each battery pack from high to low to obtain a sorting table;
acquiring the output power of a load connected with the parallel energy storage equipment;
determining the number N of the battery packs supplying power to the load according to the output power of the load, the maximum output power and the sorting table;
determining the distribution power of the first N battery packs in the sorting table according to the residual capacity of the first N +1 battery packs in the sorting table and the output power of the load, wherein N +1 is not more than M, and the distribution power is the output power required to be output by the first N battery packs;
supplying power to the load according to the distributed power and the maximum output power of the first N battery packs;
when the residual capacity of at least one battery pack in the current N battery packs is equal to the residual capacity of the (N + 1) th battery pack, merging the (N + 1) th battery pack into the battery pack so that the first N +1 battery packs supply power to the load according to the distributed power and the maximum output power of the battery packs, wherein the N +1 is less than or equal to M; and the like until the M battery packs are combined.
In some embodiments, the determining the number N of battery packs to power the load according to the output power of the load, the maximum output power, and the sorting table includes:
if each of the maximum output powers is the same, determining the number N of the battery packs supplying power to the load by:
N＝int(P/Pbag max)；
Wherein int (·) represents rounding up, P is the output power of the load, PBag maxIs the maximum output power.
In some embodiments, the determining the number N of battery packs to power the load according to the output power of the load, the maximum output power, and the sorting table includes:
when the maximum output powers are different, if the difference between a first sum and the output power of the load is smaller than or equal to a preset threshold, determining that the number of the battery packs supplying power to the load is N, wherein the first sum is the sum of the maximum output powers of the first N battery packs in the sorting table.
In some embodiments, the determining the allocated power of the first N battery packs in the sorting table according to the remaining capacity of the first N +1 battery packs and the output power of the load includes:
acquiring a first difference value between the residual capacity of the first N battery packs and the residual capacity of the (N + 1) th battery pack;
and determining the distribution power of the first N battery packs in the sorting table according to the difference ratio of the first difference and the output power of the load.
In some embodiments, said powering said load according to the allocated power of the first N said battery packs and said maximum output power comprises:
and if the distributed power is less than or equal to the corresponding maximum output power, controlling the battery pack to supply power to the load according to the distributed power.
In some embodiments, said powering said load according to the allocated power of the first N said battery packs and said maximum output power comprises:
if the distribution power is larger than the corresponding maximum output power, determining the distribution power of the corresponding battery pack as the corresponding maximum output power, and acquiring a second difference value between the distribution power and the maximum output power;
according to the difference ratio, distributing the second difference to the battery pack which does not exceed the maximum output power in the first N battery packs to obtain new distributed power;
and controlling the battery pack to supply power to the load according to the new distributed power.
In some embodiments, the method further comprises:
and when the output power of the load connected with the parallel energy storage equipment is changed, returning to the step of determining the number N of the battery packs supplying power to the load according to the output power of the load, the maximum output power and the sorting table.
In a second aspect, an embodiment of the present invention provides a controller, including at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of discharging parallel energy storage devices as described above.
In a third aspect, an embodiment of the present invention provides an energy storage inverter, including: the energy storage module and the inverter module are connected in parallel;
the parallel energy storage module comprises M parallel battery packs, wherein M is more than or equal to 2;
the inverter module comprises M DC/DC conversion modules connected in parallel, an inversion module and the controller, wherein the battery packs are connected with the input ends of the DC/DC conversion modules in a one-to-one correspondence manner, the output ends of the DC/DC conversion modules are connected in parallel first and then connected with the input ends of the inversion module, and the battery packs, the DC/DC conversion modules and the inversion module are all connected with the controller.
In a fourth aspect, an embodiment of the present invention provides an energy storage system, where the energy storage system stores multiple discharge modes and multiple control instructions in advance, where at least one of the discharge modes employs the discharge method of the parallel energy storage device, and each control instruction corresponds to one of the discharge modes;
the energy storage system is used for receiving the control instruction, acquiring the corresponding discharge mode according to the control instruction, and supplying power to a load by adopting the corresponding discharge mode.
Compared with the prior art, the invention at least has the following beneficial effects: the discharging method of the parallel energy storage equipment is applied to the parallel energy storage equipment which comprises M parallel battery packs, firstly, the discharging method obtains the residual capacity and the maximum output power of each battery pack, sorts the battery packs according to the residual capacity of each battery pack from high to low to obtain a sorting table, then obtains the output power of a load connected with the parallel energy storage equipment, further determines the number N of the battery packs for supplying power to the load according to the output power, the maximum output power and the sorting table of the load, then supplies power to the load according to the distribution power and the maximum output power of the previous N battery packs, when the residual capacity of at least one battery pack in the current N battery packs is equal to the residual capacity of the (N + 1) th battery pack, the (N + 1) th battery pack is merged to ensure that the previous (N + 1) th battery pack is according to the distribution power and the maximum output power of the battery pack, and (4) supplying power to the load, and so on until the M battery packs are combined.
In summary, the method first supplies power to the load through the first N battery packs with higher electric quantity, and when the remaining capacity of at least one battery pack in the first N battery packs is equal to the remaining capacity of the (N + 1) th battery pack, the (N + 1) th battery pack is merged until the M battery packs are merged, so that, compared with a discharging method in which the M battery packs are directly put into use, the discharging method of the present application enables the remaining capacities of the battery packs to approach to be equal in the discharging process of the battery packs, balances the remaining capacity of each battery pack, achieves a better balanced discharging effect, and can prolong the discharging time of the battery packs and improve the discharging efficiency of the battery packs if the output power of the load is increased. In addition, each battery pack can be loaded independently, so that the electric quantity balance of each battery pack can be ensured when a user does not need to adopt a pack combining technology, and the use by the user is facilitated.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of an energy storage inverter according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a discharging method of parallel energy storage devices according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of step S25 in FIG. 2;
FIG. 4 is a schematic flow chart of step S26 in FIG. 2;
fig. 5 is a schematic structural diagram of a discharging apparatus of a parallel energy storage device according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a hardware structure of a controller according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of an operating process of an energy storage system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the 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.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the invention. Additionally, while functional block divisions are performed in device schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in a different order than the block divisions in devices, or in flowcharts. The terms "first", "second", "third", and the like used in the present invention do not limit data and execution order, but distinguish the same items or similar items having substantially the same function and action.
Referring to fig. 1, fig. 1 is a diagram of an energy storage inverter according to an embodiment of the present invention, as shown in fig. 1, the energy storage inverter 100 includes a parallel energy storage module 10 and an inverter module 20, where the parallel energy storage module 10 includes M parallel battery packs, where M is greater than or equal to 2, that is, the parallel energy storage module 10 includes at least two parallel battery packs. The inverter module 20 includes M DC/DC conversion modules 21, an inversion module 22 and a controller 23 connected in parallel, wherein the battery pack is connected to the input end of the DC/DC conversion module 21 in a one-to-one correspondence manner, the output end of the DC/DC conversion module 21 is connected to the input end of the inversion module 22 in parallel, and the battery pack, the DC/DC conversion module 21 and the inversion module 22 are connected to the controller 23.
The number of the DC/DC conversion modules 21 is the same as the number of the battery packs, and the DC/DC conversion modules 21 correspond to the battery packs one to one. The DC/DC conversion module 21 is configured to perform boost conversion on the voltage output by the battery pack, rectify the boosted voltage, and finally transmit the rectified voltage to the inverter module 22. The working state of the DC/DC conversion module 21 is controlled in real time by the controller 23, for example: the controller 23 controls the operating state of the DC/DC conversion module 21 and controls its internal circuits to implement corresponding boost conversion according to the voltage, current, temperature and remaining capacity information in its operating state transmitted from the battery pack.
The output ends of the DC/DC conversion module 21 are connected in parallel, collect the electric energy, and transmit the collected electric energy to the inverter module 22. The inverter module 22 includes an inverter circuit, which may be a full-bridge inverter circuit for performing full-bridge inversion on the collected electric energy. The inverter module 22 may further include some filter circuits for filtering the summarized electric energy or filtering the inverted electric energy, so as to obtain AC electric energy with satisfactory quality. The inverter module 22 is also connected to the controller 23, and the controller 23 performs PWM control on the high-frequency power MOS in the full-bridge inverter circuit, so as to implement real-time control of the full-bridge inverter circuit by the controller 23.
The controller 23 may be disposed inside the energy storage inverter 100, or may be an external controller, where the controller 23 is used as a control core of the energy storage inverter 100, and is configured to control the operating states of the DC/DC conversion module 21 and the inverter module 22, and control the charging and discharging modes and the charging and discharging methods of the M battery packs, for example, a discharging method of a parallel energy storage device provided in the following embodiments.
In some embodiments, the controller 23 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a single chip, an ARM (Acorn RISC machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the controller 23 may be any conventional processor, controller, microcontroller, or state machine. The controller 23 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP, and/or any other such configuration.
Referring to fig. 2, fig. 2 is a schematic flow chart of a discharging method of a parallel energy storage device according to an embodiment of the present invention, where the parallel energy storage device includes M battery packs connected in parallel, where M is greater than or equal to 2, and as shown in fig. 2, the discharging method of the parallel energy storage device includes:
s21, acquiring the residual capacity and the maximum output power of each battery pack;
the battery pack refers to a battery pack connected to a host, which can output power together to supply power to a load, for example, the number of the battery packs is M, where M is greater than or equal to 2, preferably M is greater than or equal to 3, or more, that is, the parallel energy storage device includes at least two battery packs.
The remaining capacity of the battery pack refers to the remaining capacity of the battery pack, i.e., the remaining SOC of the battery pack, and the maximum output power of the battery pack is the rated output power of the battery pack. During the discharge of the battery packs, the controller may directly acquire the remaining capacity and the maximum output power of each battery pack, and may also acquire the above parameters from a battery management system (BMS system).
S22, sorting the battery packs according to the residual capacity of each battery pack from high to low to obtain a sorting table;
s23, acquiring the output power of a load connected with the parallel energy storage equipment;
the load is electrically connected with the parallel energy storage equipment, the output power of the load can be acquired in real time by detecting the power P of the load, the output power of the load can be stored in the controller or the BMS system in advance, and the output power of the load can be acquired when the load needs to be discharged.
S24, determining the number N of the battery packs supplying power to the load according to the output power of the load, the maximum output power and the sorting table;
when the power supply is carried out on the load, the M battery packs are not directly used for discharging, but the number N of the battery packs for supplying power to the load is comprehensively determined according to the output power of the load, the maximum output power of the battery packs and the sorting table, wherein N is less than or equal to M.
Specifically, in some embodiments, if each of the maximum output powers is the same, the number N of battery packs supplying the load is determined by:
N＝int(P/Pbag max) (1)
Wherein int (. -) represents rounding up, P is the output power of the load, PBag maxIs the maximum output power.
E.g. P2000W, PBag maxAnd when the power is 1500W, N is 2, namely two battery packs supply power to the load.
In some embodiments, if the maximum output powers of the battery packs are different, the number of the battery packs supplying power to the load is determined to be N if a difference between a first sum value and the output power of the load is less than or equal to a preset threshold, wherein the first sum value is a sum of the maximum output powers of the first N battery packs in the sorting table.
That is, the difference between the sum of the maximum output powers of the first N battery packs in the sorting table and the output power of the load is less than or equal to a preset threshold, wherein the preset threshold may be set as required. The smaller the difference between the first sum and the output power of the load, the better, preferably the difference between the first sum and the output power of the load is zero.
S25, determining the distribution power of the first N battery packs in the sorting table according to the residual capacity of the first N +1 battery packs in the sorting table and the output power of the load, wherein N +1 is not more than M, and the distribution power is the output power required to be output by the first N battery packs;
after the number of the battery packs for supplying power to the load is determined, the output power required to be output by each battery pack is determined, namely the distributed power of the N battery packs is determined. In order to make the remaining capacity of the battery pack more balanced and achieve a better balancing effect, when determining the distributed power of the N battery packs, the remaining capacity of the (N + 1) th battery pack is also taken into account and is determined according to the remaining capacity of the first (N + 1) th battery pack.
Specifically, referring to fig. 3, step S25 includes:
s251, acquiring a first difference value between the residual capacity of the first N battery packs and the residual capacity of the (N + 1) th battery pack;
through this step, N first difference values can be obtained. For example: n is 2, the remaining capacities of the first N +1 battery packs are respectively a1 ═ 1600Wh, a2 ═ 1200Wh, and A3 ═ 800Wh, then the number of first differences is two, respectively Δ 1 ═ a1-A3 ═ 800Wh, and Δ 2 ═ a2-A3 ═ 400 Wh.
And S252, determining the distribution power of the first N battery packs in the sorting table according to the difference ratio of the first difference and the output power of the load.
The difference ratio of the first difference is used as the ratio of the distributed power of the battery pack. For example: as described above, if the number of the first differences is two, and Δ 1 is 800Wh, and Δ 2 is 400Wh, the difference ratio of the first differences is Δ 1: Δ 2 ═ 800 Wh: when 400Wh is 2:1, the ratio of the distributed power of the first 2 battery packs is 2:1, and when a1 is 1600Wh and a2 is 1200Wh, and the output power P of the load is 2000W, the distributed power P1 of the first battery pack is 2/3, 2000W, 1333W, P2 is 1/3, 2000W, 667W, that is, P1: p2 ═ 2: 1.
Namely, the difference of the remaining capacity between the first N battery packs and the (N + 1) th battery pack is obtained, and then the distributed power of the first N battery packs is determined according to the difference proportion between the difference values and the output power of the load. Through the method, the distribution power of the first N battery packs is associated with the residual capacity of the (N + 1) th battery pack, so that the residual capacity of the first N battery packs is slowly close to the residual capacity of the (N + 1) th battery pack along with the discharge of the first N battery packs, and compared with a method for directly obtaining the distribution power according to the residual capacity proportion, the distribution method can enable the residual capacity of each battery pack to be more balanced, and achieves a better balance effect.
S26, supplying power to the load according to the distributed power of the first N battery packs and the maximum output power;
the distribution power of the first N battery packs is a theoretical calculation value, which may be greater than the maximum output power of the battery packs, or may be less than or equal to the maximum output power of the battery packs, and therefore, the final power when the load is supplied with power needs to be determined according to the distribution power of the battery packs and the corresponding maximum output power.
In some embodiments, if the allocated power of the battery pack exceeds the corresponding maximum output power, the battery pack is output according to the maximum output power to supply power to the load, and the excess power is allocated to other battery packs not exceeding the maximum output power according to the difference proportion of the first difference in the foregoing embodiments. Specifically, referring to fig. 4, step S26 includes:
s261, if the distributed power is larger than the corresponding maximum output power, determining the distributed power of the corresponding battery pack as the corresponding maximum output power, and acquiring a second difference value between the distributed power and the maximum output power;
s262, distributing the second difference value to the battery pack which does not exceed the maximum output power in the first N battery packs according to the difference value proportion to obtain new distributed power;
and S263, controlling the battery pack to supply power to the load according to the new distributed power.
If the calculated distribution power is larger than the corresponding maximum output power, the battery pack triggers a protection mechanism for further regulation and control, the load is supplied with power according to the maximum output power of the battery pack, and the calculated distribution power exceeding the maximum output power of the battery pack is distributed to other battery packs not exceeding the maximum output power according to the difference ratio to obtain new distribution power.
For example: assuming that the maximum output power of each battery pack is 1200W, the load output power P is 2000W, N is 2, and the remaining SOCs of the first N +1 battery packs are respectively a1 Wh, a2 Wh, and A3 Wh, then the distributed power of the a1 battery pack is calculated as P1 ═ a1-A3)/(a1+ a2-2A3 ═ P800/1200 ═ 2000W — 1333W, and the distributed power P2 of the a2 battery pack is 667W, but when a1 outputs 1333W, the maximum output power P is exceeded 1200W. Thus, the a1 pack is controlled to output 1200W, the difference between the a1 pack allocated power and its maximum output power is 133W, and 133W is allocated to the a2 pack, so that the a2 pack output 667W +133W becomes 800W.
Another example is: when the load output power is 3000W and the maximum output power per battery pack is 1200W, N +1 battery packs are required to be output, and the remaining SOCs of the first N +1 battery packs are respectively a1 Wh, a2 1200Wh, A3 800Wh, and a4 400W. Then the calculated allocated power of a1, a2 and A3 is 1500W, 1000W and 500W respectively, then the allocated power 1500W of the a1 battery pack exceeds the maximum output power of the battery pack, so the a1 battery pack is controlled to supply power to the load according to the maximum output 1200W, and the exceeded 300W is controlled to be (a2-a4) (A3-a4) ═ 1200-): (800-400) the ratio is distributed to the A2 battery pack and the A3 battery pack, the newly distributed power of the A2 battery pack is 1200W, the newly distributed power of the A3 battery pack is 600W, and the A2 battery pack and the A3 battery pack are controlled to supply power to the load according to the newly distributed power. At this time, the SOC of the a2 battery pack and the A3 battery pack theoretically reach the same SOC as the a4 battery pack.
When the distribution power of the battery pack exceeds the maximum output power of the battery pack, the battery pack supplies power to a load according to the maximum output power, and meanwhile, the excess part of power is distributed to other battery packs which do not exceed the maximum output power according to the difference ratio of the residual capacity. When the residual capacity of at least one battery pack in the current N battery packs is equal to the (N + 1) th battery pack, the subsequent operation of the discharging method is carried out.
Therefore, the method for acquiring the distributed power not only meets the load power supply requirement, but also enables the residual electric quantity of each battery pack to be balanced as much as possible, achieves a better balanced discharge effect, and further prolongs the discharge time of the battery packs.
In some embodiments, if the allocated power is less than or equal to the corresponding maximum output power, the battery pack is controlled to supply power to the load according to the allocated power. According to the method, the distributed power is obtained, and when the load is supplied with power according to the distributed power, the residual capacity of the N battery packs is reduced to the residual capacity of the (N + 1) th battery pack along with the discharge of the N battery packs, namely the residual capacity of the N battery packs is equal to the residual capacity of the (N + 1) th battery pack. When the residual capacity of the N battery packs is simultaneously reduced to the residual capacity of the (N + 1) th battery pack, the subsequent operation of the discharging method is carried out.
Therefore, the method for acquiring the distributed power can enable the residual capacity of the battery pack to be balanced slowly in the discharging process, and achieve a better balanced discharging effect.
S27, when the residual capacity of at least one battery pack in the current N battery packs is equal to that of the (N + 1) th battery pack, merging the (N + 1) th battery pack to enable the first (N + 1) th battery pack to supply power to the load according to the distributed power and the maximum output power of the battery packs, wherein the (N + 1) th battery pack is not more than M; and the like until the M battery packs are combined.
If the distribution power of the battery packs is larger than the maximum output power, the residual capacity of at least one battery pack in the first N battery packs is equal to the residual capacity of the (N + 1) th battery pack along with the discharge of the first N battery packs. If the distributed power of the battery packs is smaller than or equal to the maximum output power, the residual capacity of the first N battery packs is equal to the residual capacity of the (N + 1) th battery pack at the same time along with the discharge of the first N battery packs.
When the residual capacity of at least one battery pack in the current N battery packs is equal to the residual capacity of the (N + 1) th battery pack, the (N + 1) th battery pack is merged, the distributed power of the previous (N + 1) th battery packs is obtained by the power distribution method, and power is continuously supplied to the load according to the distributed power and the maximum output power so that the load can normally work. When the residual capacity of at least one battery pack in the current N +1 battery packs is the same as that of the (N + 2) th battery pack, merging the (N + 2) th battery pack, redistributing the distributed power of each battery pack, and so on until the M battery packs are merged.
To sum up, the discharging method first supplies power to the load through the first N battery packs with higher electric quantity, and associates the distributed power of the first N battery packs with the remaining capacity of the first N +1 battery packs, so that as the first N battery packs are discharged, the remaining capacity of at least one battery pack in the first N battery packs is equal to the remaining capacity of the (N + 1) th battery pack, and at this time, the (N + 1) th battery pack is merged into the M battery packs. Therefore, compared with a discharging method in which the M battery packs are directly put into use, the discharging method enables the residual capacity of each battery pack to be equal as much as possible in the discharging process of the battery packs, balances the residual capacity of each battery pack, and achieves a better balanced discharging effect. In addition, when the output power of the load is increased, the discharging method enables the residual capacity of each battery pack to be more balanced, and the M battery packs are merged one by one, so that the discharging time of the battery packs can be prolonged, and the discharging efficiency of the battery packs is improved. In addition, each battery pack can be loaded independently, so that the electric quantity balance of each battery pack can be ensured when a user does not need to adopt a pack combining technology, and the use by the user is facilitated.
In some embodiments, the method of discharging the parallel energy storage devices further comprises: detecting whether the output power of a load changes in real time, when the output power of the load connected with the parallel energy storage equipment changes, returning to the step of determining the number N of the battery packs supplying power to the load according to the output power of the load, the maximum output power and the sequencing table, and then re-determining the number of the battery packs supplying power to the load and the distribution power of each battery pack so as to realize normal power supply to the load. Therefore, the discharging method can adjust the number of the battery packs supplying power to the load and the distribution power of each battery pack according to the change of the output power of the load in real time, so that the load can work normally, the power consumption requirement of the load is met in time, and the use by a user is facilitated.
Fig. 5 is a schematic structural diagram of a discharging apparatus for parallel energy storage devices according to an embodiment of the present invention, where the discharging apparatus 200 for parallel energy storage devices includes a first obtaining module 201, configured to obtain a remaining capacity and a maximum output power of each battery pack; the sorting module 202 is configured to sort the battery packs according to the remaining capacity of each battery pack from high to low, so as to obtain a sorting table; the second obtaining module 203 is configured to obtain output power of a load connected to the parallel energy storage device; a first determining module 204, configured to determine, according to the output power of the load, the maximum output power, and the sorting table, the number N of the battery packs that supply power to the load; a second determining module 205, configured to determine, according to the remaining capacity of the first N +1 battery packs in the sorting table and the output power of the load, the distributed power of the first N battery packs in the sorting table, where N +1 is equal to or less than M, and the distributed power is the output power required to be output by the first N battery packs; a power supply module 206, configured to supply power to the load according to the distributed power of the first N battery packs and the maximum output power; a merging module 207, configured to merge the (N + 1) th battery pack when the remaining capacity of at least one of the N battery packs is equal to the remaining capacity of the (N + 1) th battery pack, so that the first N +1 battery packs supply power to the load according to the allocated power of the battery packs and the maximum output power, where N +1 is ≦ M; and the like until the M battery packs are combined.
Therefore, in this embodiment, the discharging device of the parallel energy storage device enables the remaining capacities of the battery packs to be equal as much as possible during the discharging process of the battery packs, balances the remaining capacities of the battery packs, and achieves a better balanced discharging effect. In addition, when the output power of the load is increased, the discharging method enables the residual capacity of each battery pack to be more balanced, and the M battery packs are merged one by one, so that the discharging time of the battery packs can be prolonged, and the discharging efficiency of the battery packs is improved. In addition, each battery pack can be loaded independently, so that the electric quantity balance of each battery pack can be ensured when a user does not need to adopt a pack combining technology, and the use by the user is facilitated.
It should be noted that, since the discharging apparatus of the parallel energy storage device and the discharging method of the parallel energy storage device in the above embodiment are based on the same inventive concept, the corresponding content in the above method embodiment is also applicable to the apparatus embodiment, and is not described in detail here.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a controller according to an embodiment of the present invention. As shown in fig. 6, the controller 23 includes one or more processors 231 and a memory 232. In fig. 6, one processor 231 is taken as an example.
The processor 231 and the memory 232 may be connected by a bus or other means, such as the bus connection shown in fig. 6.
The memory 232, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the discharging method of the parallel energy storage device in the embodiment of the present invention. The processor 231 executes various functional applications and data processing of the discharging apparatus of the parallel energy storage device by running the nonvolatile software program, instructions and modules stored in the memory 232, that is, the discharging method of the parallel energy storage device provided by the above method embodiment and the functions of the various modules or units of the above apparatus embodiment are realized.
The memory 232 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 232 may optionally include memory located remotely from the processor 231, which may be connected to the processor 231 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The program instructions/modules are stored in the memory 232 and, when executed by the one or more processors 231, perform the method of discharging the parallel energy storage devices of any of the method embodiments described above.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer-executable instructions, which are executed by one or more processors, such as the processor 231 in fig. 6, and enable the one or more processors to perform the method for discharging the parallel energy storage devices in any of the method embodiments.
Embodiments of the present invention also provide a non-volatile computer storage medium, where the computer storage medium stores computer-executable instructions, which are executed by one or more processors, such as one of the processors 231 in fig. 6, and enable the one or more processors to perform the method for discharging the parallel energy storage devices in any of the method embodiments.
Embodiments also provide a computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a controller, cause the controller to perform any one of the methods of discharging parallel energy storage devices.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. Those skilled in the art will appreciate that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program in a computer program product, the computer program can be stored in a non-transitory computer readable storage medium, and the computer program includes program instructions, which when executed by a drone, cause the drone to perform the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
According to the discharging method of the parallel energy storage equipment, the residual capacity of each battery pack is equal to the greatest extent in the discharging process of the battery packs, the residual capacity of each battery pack is balanced, and a better balanced discharging effect is achieved. In addition, when the output power of the load is increased, the discharging method enables the residual capacity of each battery pack to be more balanced, and the M battery packs are merged one by one, so that the discharging time of the battery packs can be prolonged, and the discharging efficiency of the battery packs is improved. In addition, each battery pack can be loaded independently, so that the electric quantity balance of each battery pack can be ensured when a user does not need to adopt a pack combining technology, and the use by the user is facilitated.
In order to realize the loaded high-power equipment, a plurality of battery packs are generally connected with a host, and each battery pack outputs certain power, so that the high-power load equipment is driven. However, in the multi-battery pack combining technology, there are a plurality of battery pack combination discharging modes, and in the existing energy storage device, one discharging mode is usually selected, and a user can only discharge the plurality of battery packs according to the discharging mode when using the product. For example: the user wants to discharge for a longer time in one time period and equalize the remaining SOC of each battery pack in another time period. The method can not meet diversified requirements of users and has low use experience.
Based on this, the present invention provides an energy storage system, where multiple discharge modes and multiple control instructions are pre-stored in the energy storage system, where at least one discharge mode adopts the discharge method of the parallel energy storage device as described in any of the above embodiments, and each control instruction corresponds to one discharge mode, and the energy storage system is configured to receive the control instruction, obtain the corresponding discharge mode according to the control instruction, and supply power to a load by using the corresponding discharge mode.
The control instructions may be in a variety of forms, such as: the control signal that the user sent through the APP, or the user is through pressing the signal of pressing that the function button that corresponds on the energy storage system obtained, or the speech signal that the user sent, can also be the control signal that the user sent through the touch panel on the energy storage system etc..
The discharge mode may be a plurality of discharge modes, which may be an existing discharge mode or a discharge mode set by a user in real time, for example: a user edits and sets a discharge mode in real time and stores the discharge mode in the energy storage system, and the energy storage system establishes a corresponding relation between the discharge mode and a corresponding control instruction so as to be convenient for the user to select.
Therefore, aiming at different loads, the corresponding discharging mode in the energy storage system can be selected to discharge the energy storage system, the maximum discharging efficiency is realized, the using mode is flexible, the energy storage system is convenient for users to use, and the user experience is improved.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating a working process flow of an energy storage system according to an embodiment of the present invention, and as shown in fig. 7, the working principle of the energy storage system can be described as follows:
s71, storing the multiple discharging modes into an energy storage system;
specifically, in the technology of parallel discharging a plurality of battery packs, there are a plurality of discharge modes, for example:
first discharge mode: and determining the output power of each battery pack according to the residual SOC of each battery pack and the output power of the load so that the load can work normally.
Second discharge mode: the method for discharging the parallel energy storage devices according to any one of the embodiments.
Third discharge mode: the plurality of battery packs are discharged in sequence, namely after the electric quantity of one battery pack is discharged, another battery pack is used for discharging.
Fourth discharge mode: and in the battery pack mutual charging mode, the electric quantity of the plurality of battery packs is balanced, and then the battery packs are discharged outwards.
It should be noted that the discharge modes are not limited to the above four, and the discharge modes stored in the energy storage system may be any two or more discharge modes.
S72, constructing one-to-one correspondence relationship between a plurality of control instructions and a plurality of discharge modes;
specifically, for example, there are four discharge modes, which are a first discharge mode, a second discharge mode, a third discharge mode and a fourth discharge mode. The control system comprises four control instructions, namely a first control instruction, a second control instruction, a third control instruction and a fourth control instruction. The first control command corresponds to a first discharge mode, the second control command corresponds to a second discharge mode, and so on.
S73, receiving a control instruction;
specifically, if the energy storage system is provided with a function switch, a user can send a control instruction by adjusting the switch gear. Or a control instruction sent by the user through the APP. For another example, the energy storage system has a touch panel, and the user selects the discharge mode through the touch panel.
The first control instruction, the second control instruction, the third control instruction, and the fourth control instruction may be instructions obtained in different manners. For example: the first control instruction is a control instruction sent by a user through adjusting the switch gear, and the second control instruction is a voice instruction sent by the user, and the like.
S74, acquiring a discharge mode corresponding to the control command;
specifically, the type of the control command is analyzed, and the discharge mode required by the user is determined according to the corresponding relation between the control command and the plurality of discharge modes.
And S75, controlling the plurality of battery packs of the energy storage system to discharge according to the corresponding discharge modes.
And discharging the battery pack according to the corresponding discharge mode to meet the user requirement, meanwhile, in the discharge process, the energy storage system still receives the control instruction, if the control instruction is changed, the discharge mode corresponding to the changed control instruction is obtained again, and the battery pack is controlled to discharge according to the new discharge mode.
According to the discharge control method of the energy storage system, the plurality of discharge modes are stored in the energy storage system in advance, and the corresponding discharge mode is executed according to the received control instruction sent by the user, so that diversified requirements of the user are met.
Further, in an embodiment, the discharge control method of the energy storage system further includes setting one of the plurality of discharge modes as a default discharge mode, and executing the default discharge mode when a control instruction issued by a user is not received. Preferably, the discharge mode of the parallel energy storage devices according to any of the above embodiments is set as a default mode.
In summary, the energy storage system stores a plurality of discharge modes in the energy storage system in advance, and executes the corresponding discharge mode according to the received control instruction sent by the user. Different discharging modes can be selected to discharge the load according to different loads, the maximum discharging efficiency is achieved, diversified requirements of users are met, the using mode is flexible, and user experience is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A discharging method of parallel energy storage equipment is characterized in that the parallel energy storage equipment comprises M parallel battery packs, wherein M is more than or equal to 2, and the method comprises the following steps:
acquiring the residual capacity and the maximum output power of each battery pack;
sorting the battery packs according to the residual capacity of each battery pack from high to low to obtain a sorting table;
acquiring the output power of a load connected with the parallel energy storage equipment;
determining the number N of the battery packs supplying power to the load according to the output power of the load, the maximum output power and the sequencing table;
determining the distribution power of the first N battery packs in the sorting table according to the residual capacity of the first N +1 battery packs in the sorting table and the output power of the load, wherein N +1 is not more than M, and the distribution power is the output power required to be output by the first N battery packs;
supplying power to the load according to the distributed power and the maximum output power of the first N battery packs;
when the residual capacity of at least one battery pack in the current N battery packs is equal to the residual capacity of the (N + 1) th battery pack, merging the (N + 1) th battery pack into the battery pack so that the first N +1 battery packs supply power to the load according to the distributed power and the maximum output power of the battery packs, wherein the N +1 is less than or equal to M; and the like until the M battery packs are combined.
2. The method of claim 1, wherein determining the number N of battery packs powering the load according to the output power of the load, the maximum output power, and the sorted list comprises:
if each of the maximum output powers is the same, determining the number N of the battery packs supplying power to the load by:
N＝int(P/Pbag max)；
Wherein int (. -) represents rounding up, P is the output power of the load, PBag maxIs the maximum output power.
3. The method of claim 2, wherein determining the number N of battery packs powering the load based on the output power of the load, the maximum output power, and the sorted list comprises:
when the maximum output powers are different, if the difference between a first sum and the output power of the load is smaller than or equal to a preset threshold, determining that the number of the battery packs supplying power to the load is N, wherein the first sum is the sum of the maximum output powers of the first N battery packs in the sorting table.
4. The method according to any one of claims 1-3, wherein said determining the allocated power of the first N battery packs in the sorting table according to the remaining capacities of the first N +1 battery packs and the output power of the load comprises:
acquiring a first difference value between the residual capacity of the first N battery packs and the residual capacity of the (N + 1) th battery pack;
and determining the distribution power of the first N battery packs in the sorting table according to the difference ratio of the first difference and the output power of the load.
5. The method of claim 4, wherein said powering the load according to the allocated power of the first N of the battery packs and the maximum output power comprises:
and if the distributed power is less than or equal to the corresponding maximum output power, controlling the battery pack to supply power to the load according to the distributed power.
6. The method of claim 5, wherein said powering the load according to the allocated power of the first N of the battery packs and the maximum output power comprises:
if the distribution power is larger than the corresponding maximum output power, determining the distribution power of the corresponding battery pack as the corresponding maximum output power, and acquiring a second difference value between the distribution power and the maximum output power;
according to the difference ratio, distributing the second difference to the battery pack which does not exceed the maximum output power in the first N battery packs to obtain new distributed power;
and controlling the battery pack to supply power to the load according to the new distributed power.
7. The method of claim 1, further comprising:
and when the output power of the load connected with the parallel energy storage equipment is changed, returning to the step of determining the number N of the battery packs supplying power to the load according to the output power of the load, the maximum output power and the sorting table.
8. A controller, characterized in that the controller comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of discharging the parallel energy storage devices of any of claims 1-7.
9. An energy storage inverter, characterized in that it comprises: the energy storage module and the inverter module are connected in parallel;
the parallel energy storage module comprises M parallel battery packs, wherein M is more than or equal to 2;
the inverter module comprises M DC/DC conversion modules connected in parallel, an inversion module and the controller as claimed in claim 8, wherein the battery pack is connected with the input end of the DC/DC conversion module in a one-to-one correspondence manner, the output end of the DC/DC conversion module is connected in parallel first and then connected with the input end of the inversion module, and the battery pack, the DC/DC conversion module and the inversion module are all connected with the controller.
10. An energy storage system, characterized in that the energy storage system stores a plurality of discharging modes and a plurality of control commands in advance, wherein at least one discharging mode adopts the discharging method of the parallel energy storage device according to any one of claims 1 to 7, and each control command corresponds to one discharging mode;
the energy storage system is used for receiving the control instruction, acquiring the corresponding discharge mode according to the control instruction, and supplying power to a load by adopting the corresponding discharge mode.
CN202210255373.8A 2022-03-15 2022-03-15 Discharging method of parallel energy storage equipment, energy storage inverter and energy storage system Pending CN114567045A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115001055A (en) * 2022-08-03 2022-09-02 深圳市德兰明海科技有限公司 Multi-inverter parallel connection self-adaptive control method and device and multi-inverter parallel connection system
CN115603430A (en) * 2022-11-16 2023-01-13 浙江动一新能源动力科技股份有限公司（Cn） Portable electric energy storage system and power adjusting method thereof
CN115686124A (en) * 2022-12-30 2023-02-03 南京积芯力科技有限公司 Energy storage battery output power self-adjusting system and method based on safety protection

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115001055A (en) * 2022-08-03 2022-09-02 深圳市德兰明海科技有限公司 Multi-inverter parallel connection self-adaptive control method and device and multi-inverter parallel connection system
US11791745B1 (en) 2022-08-03 2023-10-17 Shenzhen Poweroak Newener Co., Ltd Adaptive control method for multiple inverters in parallel and system with multiple inverters in parallel
CN115603430A (en) * 2022-11-16 2023-01-13 浙江动一新能源动力科技股份有限公司（Cn） Portable electric energy storage system and power adjusting method thereof
US11973416B1 (en) 2022-11-16 2024-04-30 Zhejiang Lera New Energy Power Technology Co., Ltd Adaptive load-responsive portable electric energy storage system and power regulation method thereof
CN115686124A (en) * 2022-12-30 2023-02-03 南京积芯力科技有限公司 Energy storage battery output power self-adjusting system and method based on safety protection

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