CN114678896A - Power output control method and device of high-power energy storage equipment and energy storage equipment - Google Patents
Power output control method and device of high-power energy storage equipment and energy storage equipment Download PDFInfo
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- CN114678896A CN114678896A CN202210441257.5A CN202210441257A CN114678896A CN 114678896 A CN114678896 A CN 114678896A CN 202210441257 A CN202210441257 A CN 202210441257A CN 114678896 A CN114678896 A CN 114678896A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0025—Sequential battery discharge in systems with a plurality of batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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- 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
Abstract
The invention belongs to the technical field of energy storage equipment, and discloses a power output control method and device of high-power energy storage equipment and the energy storage equipment, wherein the method comprises the steps of obtaining first power required by a load and judging whether the first power is greater than rated second power of a first inverter or not; if the first power is larger than the second power, the output of the master module is closed and the slave modules are controlled to enter a grid-connected output mode, and after the slave modules finish output preparation, the master module and the slave modules output the first power required by the load; the energy storage device comprises a master module and a plurality of slave modules. Has the advantages that: through setting up the power output that main module and slave module coordinated energy storage equipment, can avoid the dc-to-ac converter to transship or appear overpower protection, improve inverter life-span and battery life-span, improve user experience.
Description
Technical Field
The invention relates to the technical field of energy storage equipment, in particular to a power output control method and device of high-power energy storage equipment and the energy storage equipment.
Background
At present, the energy storage device is a battery pack and a high-power inverter which are matched to output to a load end. When the load is large, the power reaches or exceeds the limit value of the inverter, and at the moment, the inverter generates heat seriously or is protected by over power, so that the service life is shortened, and the user experience is poor.
Disclosure of Invention
The purpose of the invention is: the power output control method and device for the high-power energy storage equipment and the energy storage equipment are provided, the main module and the slave module are arranged to coordinate the power output of the energy storage equipment, the overload of the inverter is avoided, the service life of the inverter and the service life of a battery are shortened, and the user experience is improved.
In order to achieve the above object, the present invention provides a power output control method for a high power energy storage device, including:
acquiring first power required by a load and judging whether the first power is greater than rated second power of the first inverter or not;
if the first power is larger than the second power, the output of the master module is closed and the slave modules are controlled to enter a grid-connected output mode, and after the slave modules finish output preparation, the master module and the slave modules output the first power required by the load; the energy storage device comprises a master module and a plurality of slave modules.
Further, the output of the master module is closed and the slave modules are controlled to enter a grid-connected output mode, specifically:
judging a first number of slave modules required when first power is output, and sequencing the electric quantity of all the slave modules from large to small; and selecting slave modules with the ranking less than or equal to the first number to enter a grid-connected output mode.
Further, the difference between the maximum output power that can be provided by the slave modules and the master module in the first number after being connected to the grid and the second power is greater than a first threshold.
Further, the control method further includes:
when the main module and the plurality of slave modules output first power required by the load together, judging whether the output power of each module is larger than the average output power, and if the output power of the main module or the slave modules is larger than the average output power, reducing the output power of the main module or the slave modules; and if the output power of the master module or the slave module is smaller than the average output power, increasing the output power of the master module or the slave module.
Further, the control method further includes:
judging whether the current temperature of the master module or each slave module is greater than a first temperature, and if the current temperature of the master module or each slave module is greater than the first temperature, adjusting the output power of the master module or each slave module to be a first target output power according to a first formula and a second formula;
the first formula is:
the temperature adjusting power is the average output power- (current temperature-first temperature) multiplied by a first adjusting coefficient;
the second formula is:
the first target output power is the temperature-adjusted power plus the first power/(the sum of the temperature-adjusted power + the output power of the other module).
Further, the temperature adjustment power is greater than or equal to a preset minimum output power, and if the obtained temperature adjustment power is smaller than the minimum output power, the value of the temperature adjustment power is directly the minimum output power.
Further, the control method further includes:
judging whether the difference value between the current electric quantity of each module and the average electric quantity of all the modules participating in output is larger than the SOCM, and if so, adjusting the output power of the master module or the slave module to be a second target output power according to a third formula and a fourth formula;
the third formula is:
the electric quantity adjusting power is equal to the average output power- (current electric quantity-SOCM) multiplied by a second adjusting coefficient;
the fourth formula is:
the second target output power is the electric quantity adjustment power, the first power/(the sum of the electric quantity adjustment power + the output power of the other module).
Further, the control method further includes: if the first power is less than the second power, only the main module discharges the load, and the main module comprises a first battery pack and a first inverter.
The invention also discloses a power output control device of the high-power energy storage equipment, which comprises the following components: the device comprises a first acquisition module and a first processing module;
the first obtaining module is used for obtaining first power required by a load and judging whether the first power is larger than rated second power of the first inverter or not;
the first processing module is used for closing the output of the master module and controlling the slave modules to enter a grid-connected output mode if the first power is larger than the second power, and when the slave modules finish output preparation, the master module and the slave modules output the first power required by the load; the energy storage device comprises a master module and a plurality of slave modules.
The invention also discloses an energy storage device, and the power output control device is applied.
Compared with the prior art, the power output control method and the power output control device of the high-power energy storage equipment have the beneficial effects that: through setting up the power output that main module and slave module coordinated energy storage equipment, can avoid the dc-to-ac converter to transship or appear overpower protection, improve inverter life-span and battery life-span, improve user experience.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling power output of a high power energy storage device according to the present invention;
FIG. 2 is a schematic structural diagram of a power output control device of a high-power energy storage device according to the present invention;
fig. 3 is a schematic structural diagram of an energy storage device according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1:
as shown in fig. 1, a method for controlling power output of a high-power energy storage device mainly includes the following steps:
step S1, acquiring a first power required by a load and judging whether the first power is larger than a rated second power of the first inverter or not;
step S2, if the first power is larger than the second power, the output of the master module is closed and a plurality of slave modules are controlled to enter a grid-connected output mode, and after the slave modules finish the output preparation, the master module and the slave modules output the first power required by the load; the energy storage device comprises a master module and a plurality of slave modules.
Furthermore, in the energy storage device in the prior art, one battery pack is matched with one high-power inverter to output the high-power inverter to a load end, when the load is small, the efficiency is low due to the problem of power consumption of the inverter, and the power is not fully utilized.
The control method further comprises the following steps: in step S3, if the first power is less than the second power, only the main module discharges the load, and the main module includes the first battery pack and the first inverter.
In this embodiment, any one of the master or slave modules includes a battery pack and an inverter, and the inverter communicates through the CAN bus. The inverter output is connected in parallel to the ac bus and output to the consumer or load. Each master and slave module is individually provided with a control chip or controller for processing and sending commands to control the output of power.
In this embodiment, the energy storage device is provided with a master module and a plurality of slave modules, and the master module and the slave modules jointly output the first power according to the power required by the load. When the load is small, only the main module works to meet the requirement of power output, the main module comprises a first battery pack and a first inverter, and the load is supplied with power through the first inverter and the first battery pack. When the load is large, the power requirement of the load cannot be met only by the master module, at the moment, the slave modules need to be powered, each slave module comprises a battery pack and an inverter, and after the slave module needing grid-connected output is determined to be added, the master module and the plurality of slave modules jointly output first power.
In conclusion, the power output method can supply power only by depending on the main module when the load is low in power, so that a larger inverter is avoided, and the working efficiency of the inverter is improved; when the load is larger, the modules work cooperatively, so that the overload or over-power protection of the inverter is avoided, the service life of the inverter and the service life of a battery are prolonged, and the user satisfaction is improved.
Example 2:
on the basis of the embodiment 1, the technical scheme of the embodiment 1 is further optimized and supplemented.
Due to the high instability at full output of the battery or inverter, it is desirable to avoid full operation of the battery or inverter as much as possible. If the inverter is 2KW, long-term operation with 2KW should be avoided. Therefore, assuming that the load requires six kilowatts, four two kilowatt inverters should be considered.
In this embodiment, the output of the master module is turned off and the slave modules are controlled by a plurality of slave modules to enter a grid-connected output mode, specifically:
judging a first number of slave modules required when first power is output and sequencing the electric quantity of all the slave modules from large to small; and selecting slave modules with the ranking less than or equal to the first number to enter a grid-connected output mode.
In this embodiment, a difference between the maximum output power that can be provided after the first number of slave modules and the master module are interconnected to the grid and the second power is greater than a first threshold.
When selecting the slave modules, in order to ensure the stability of the output power, the slave modules with more electric quantity residual should be preferentially selected, so that the electric quantity of each slave module can be acquired, and the slave modules with more electric quantity are selected after sequencing.
In this embodiment, the first threshold may be adjusted according to the power level of the inverter, and generally, the larger the power of the inverter, the larger the first threshold is. This makes it possible to avoid overloading the inverter as far as possible. It is preferable to improve the stability of the outputted first power.
Example 3:
on the basis of the embodiment 1, the technical scheme of the embodiment 1 is further optimized and supplemented.
In this embodiment, the control method further includes:
when the main module and the plurality of slave modules output first power required by the load together, judging whether the output power of each module is larger than the average output power, and if the output power of the main module or the slave modules is larger than the average output power, reducing the output power of the main module or the slave modules; and if the output power of the master module or the slave module is smaller than the average output power, increasing the output power of the master module or the slave module.
When the load exceeds the output capacity of the master module, a new slave module is introduced to output the first power together, and at this time, the master module may bear the main output power, and the output powers of the modules participating in the output are unbalanced, which is not favorable for stable output.
Example 4:
on the basis of the embodiment 3, the technical scheme of the embodiment 3 is further optimized and supplemented.
With the change of the output time or the change of the environment, the state of the energy storage device may also change, for example, if the temperature of a certain battery pack is too high, if the battery is discharged at a high temperature, the service life of the battery pack may be affected, and then the service life of the entire energy storage device may be affected, and the output power of the battery needs to be controlled according to the situation.
In this embodiment, the control method further includes:
judging whether the current temperature of the master module or each slave module is greater than a first temperature, and if the current temperature of the master module or each slave module is greater than the first temperature, adjusting the output power of the master module or each slave module to be a first target output power according to a first formula and a second formula;
the first formula is:
the temperature adjusting power is the average output power- (current temperature-first temperature) multiplied by a first adjusting coefficient;
the second formula is:
the first target output power is the temperature-adjusted power plus the first power/(the sum of the temperature-adjusted power + the output power of the other module).
The temperature can be obtained by a sensor, and the first temperature is determined according to the model of the battery pack. Since the plurality of modules are commonly supplied with power, the closer the output powers of the different modules are, the more stable the output is when the modules are combined and connected to the grid, and therefore, the output power is adjusted on the basis of the average output power.
The method comprises the steps of firstly obtaining the temperature adjusting power of a master module or each slave module, and then determining the output power of all the modules (including the master module and all the slave modules participating in output) after temperature adjustment, namely the first target output power according to the ratio of the temperature adjusting power to the power output of the modules after temperature adjustment. The temperature of a module is adjusted by a first formula whenever the temperature exceeds a first temperature. The sum of the output power of the other modules comprises the output power of the modules, if the temperature of one module does not exceed the first temperature, the average output power is taken as the output power of the other modules, and if the temperature of one module exceeds the first temperature, the temperature adjusting power adjusted by the first formula is taken as the output power of the other modules.
Examples are 1:
if there is one master module, two slave modules are marked as a first slave module and a second slave module; assuming that the temperature of the first slave module exceeds the requirement, the output power of the first slave module is adjusted through a first formula, wherein the output power of the front master module is adjusted to be P1, the first slave module is P2, and the second slave module is P3; obtaining temperature adjusting power P4 of the first slave module after adjustment of a first formula; the first power is the sum of the outputs of the three modules.
The output power of the main module is P1 (P1+ P2+ P3)/(P1+ P4+ P3);
the output power of the first slave module is P4 (P1+ P2+ P3)/(P1+ P4+ P3);
the output power of the second slave module is P3 (P1+ P2+ P3)/(P1+ P4+ P3).
For example, 2:
if there is one master module, two slave modules are marked as a first slave module and a second slave module; assuming that the temperatures of the first slave module and the second slave module exceed the requirements, adjusting the output power of the first slave module and the second slave module, wherein the output power of the master module before adjustment is P1, the output power of the first slave module is P2, and the output power of the second slave module is P3; obtaining temperature adjusting power P4 of a first slave module and temperature adjusting power P5 of a second slave module after adjustment of a first formula; the first power is the sum of the outputs of the three modules.
The output power of the main module is P1 (P1+ P2+ P3)/(P1+ P4+ P5);
the output power of the first slave module is P4 (P1+ P2+ P3)/(P1+ P4+ P5);
the output power of the second slave module is P5 (P1+ P2+ P3)/(P1+ P4+ P5).
In this embodiment, if the temperature does not exceed the first temperature, the adjustment is not performed by the first formula.
In this embodiment, the first adjustment coefficient is a constant, and can be obtained or adjusted by self-experiment as required by those skilled in the art.
In this embodiment, the temperature adjustment power is greater than or equal to a preset minimum output power, and if the obtained temperature adjustment power is smaller than the minimum output power, the value of the temperature adjustment power is directly the minimum output power. The output power difference of each module is ensured not to exceed a certain range as much as possible, so that the output is more stable.
Example 5:
on the basis of the embodiment 3, the technical scheme of the embodiment 3 is further optimized and supplemented.
In this embodiment, the control method further includes:
judging whether the difference value between the current electric quantity of each module and the average electric quantity of all the modules participating in output is larger than the SOCM, and if so, adjusting the output power of the master module or the slave module to be a second target output power according to a third formula and a fourth formula;
the third formula is:
the electric quantity adjusting power is equal to the average output power- (current electric quantity-SOCM) multiplied by a second adjusting coefficient;
the fourth formula is:
the second target output power is the electric quantity adjustment power, the first power/(the sum of the electric quantity adjustment power + the output power of the other module).
The electric quantity value of each module can be obtained through electric quantity detection, and the SOCM is determined according to the model of the battery pack. Since the plurality of modules are commonly supplied with power, the closer the output powers of the different modules are, the more stable the output is when the modules are combined and connected to the grid, and therefore, the output power is adjusted on the basis of the average output power.
Firstly, the electric quantity adjusting power of the master module or each slave module is obtained, and then the output power of the module after adjustment, namely the second target output power, is determined according to the electric quantity adjusting power and the power output ratio of all the modules (including the master module and all the slave modules participating in output) after electric quantity adjustment. The first formula is used to adjust the difference between the electric quantity value of one module and the average electric quantity of all the modules participating in the output if the difference is larger than the SOCM. The sum of the output power of the other modules comprises the output power of a plurality of modules, if the difference value between the electric quantity value of one module and the average electric quantity of all the modules participating in output is not more than the SOCM, the average output power is used as the output power of the other modules, and if the difference value between the electric quantity value of one module and the average electric quantity of all the modules participating in output is more than the SOCM, the electric quantity adjusting power adjusted by a third formula is used as the output power of the other modules.
Examples are 1:
if there is one master module, two slave modules are marked as a first slave module and a second slave module; assuming that the difference value between the electric quantity value of the first slave module and the average electric quantity of all the modules participating in output is greater than the SOCM, adjusting the output power of the first slave module by a third formula, keeping the output power of the front master module to be P1, the first slave module to be P2, and the second slave module to be P3; obtaining temperature adjusting power P4 of the first slave module after adjustment of a third formula; the first power is the sum of the outputs of the three modules.
The output power of the main module is P1 (P1+ P2+ P3)/(P1+ P4+ P3);
the output power of the first slave module is P4 (P1+ P2+ P3)/(P1+ P4+ P3);
the output power of the second slave module is P3 (P1+ P2+ P3)/(P1+ P4+ P3).
For example, 2:
if there is one master module, two slave modules are marked as a first slave module and a second slave module; assuming that the difference value between the electric quantity value of the first slave module and the average electric quantity of all the modules participating in output is greater than the SOCM, and the difference value between the electric quantity value of the second slave module and the average electric quantity of all the modules participating in output is greater than the SOCM, adjusting the output power of the first slave module and the second slave module, wherein the output power of the master module before adjustment is P1, the first slave module is P2, and the second slave module is P3; after adjustment of a third formula, obtaining electric quantity adjustment power P4 of the first slave module and electric quantity adjustment power P5 of the second slave module; the first power is the sum of the outputs of the three modules.
The output power of the main module is P1 (P1+ P2+ P3)/(P1+ P4+ P5);
the output power of the first slave module is P4 (P1+ P2+ P3)/(P1+ P4+ P5);
the output power of the second slave module is P5 (P1+ P2+ P3)/(P1+ P4+ P5).
In this embodiment, the second adjustment coefficient is a constant, and can be obtained or adjusted by self-experiment as required by those skilled in the art.
In this embodiment, the electric quantity adjusting power is greater than or equal to a preset minimum output power, and if the obtained electric quantity adjusting power is smaller than the minimum output power, the value of the electric quantity adjusting power is directly the minimum output power. The output power difference of each module is ensured not to exceed a certain range as much as possible, so that the output is more stable.
Example 6:
on the basis of the embodiment 4 and the embodiment 5, the technical scheme of the embodiment 3 is further optimized and supplemented.
Since only the temperature is considered in embodiment 4 and only the electric quantity value is considered in embodiment 5, a person skilled in the art can combine the schemes on the basis of the above technical schemes, and consider the electric quantity value and the temperature value at the same time, and can define the consideration sequence of the two factors.
If the temperature is considered first and then the electric quantity value is considered, the following technical scheme is adopted:
judging whether the temperature of each module is greater than a first temperature, if so, judging whether the difference value between the current electric quantity of the module and the average electric quantity of all the modules participating in output is greater than an SOCM (service availability management model), if so, obtaining the electric quantity adjusting power of the module through a third formula, and if not, obtaining the temperature adjusting power of the module through a first formula;
if the temperature is lower than the first temperature, the average output power is taken as the output power.
Obtaining a third target output power as a final output power according to a fifth formula, wherein the fifth formula is as follows:
the third target output power is the sum of the electric quantity adjustment power (or the temperature adjustment power), the first power/(the electric quantity adjustment power (or the temperature adjustment power) + the output power of the other module).
If the electric quantity value is considered first and then the temperature is considered, the following technical scheme is adopted:
judging whether the difference value between the current electric quantity of the master module or each slave module and the average electric quantity of all the modules participating in output is larger than the SOCM, if so, judging whether the current temperature of the module is larger than a first temperature, if so, obtaining the temperature adjusting power of the module through the first temperature, and if not, obtaining the electric quantity adjusting power of the module through a third formula;
and if the difference value between the current electric quantity of the module and the average electric quantity of all the modules participating in output is smaller than the SOCM, taking the average output power as the output power of the module.
Obtaining a third target output power as a final output power according to a fifth formula, wherein the fifth formula is as follows:
the third target output power is the electric quantity adjustment power (or temperature adjustment power) plus the first power/(the sum of the electric quantity adjustment power (or temperature adjustment power) + the output power of other modules).
Example 7:
based on the solutions of embodiments 1-6, responsive power output control means can be provided.
The invention discloses a power output control device of a high-power energy storage device, which comprises: a first acquisition module 101 and a first processing module 102;
the first obtaining module 101 is configured to obtain a first power required by a load and determine whether the first power is greater than a rated second power of the first inverter;
the first processing module 102 is configured to close output of the master module and control the slave modules to enter a grid-connected output mode if the first power is greater than the second power, and when the slave modules complete output preparation, the master module and the slave modules output first power required by a load; the energy storage device comprises a master module and a plurality of slave modules.
In this embodiment, the output of the master module is turned off and the slave modules are controlled to enter a grid-connected output mode, which specifically includes:
judging a first number of slave modules required when first power is output and sequencing the electric quantity of all the slave modules from large to small; and selecting slave modules with the ranking less than or equal to the first number to enter a grid-connected output mode.
In this embodiment, a difference between the maximum output power that can be provided by the first number of slave modules and the second power after the master module is connected to the grid is greater than a first threshold.
The power output control apparatus further includes: a first power adjustment module;
the first power adjustment module is used for judging whether the output power of each module is larger than the average output power or not when the main module and the plurality of slave modules output the first power required by the load together, and reducing the output power of the main module or the slave modules if the output power of the main module or the slave modules is larger than the average output power; and if the output power of the master module or the slave module is smaller than the average output power, increasing the output power of the master module or the slave module.
The power output control apparatus further includes: a second power adjustment module;
the second power adjustment module is used for judging whether the current temperature of the master module or each slave module is greater than the first temperature, and if the current temperature of the master module or each slave module is greater than the first temperature, adjusting the output power of the master module or each slave module to be the first target output power according to the first formula and the second formula;
the first formula is:
the temperature adjusting power is the average output power- (current temperature-first temperature) multiplied by a first adjusting coefficient;
the second formula is:
the first target output power is the temperature-adjusted power plus the first power/(the sum of the temperature-adjusted power + the output power of the other module).
In this embodiment, the temperature adjustment power is greater than or equal to a preset minimum output power, and if the obtained temperature adjustment power is smaller than the minimum output power, the value of the temperature adjustment power is directly the minimum output power.
The power output control apparatus further includes: a third power adjustment module;
the third power adjustment module is configured to determine whether a difference between the current electric quantity of each module and an average electric quantity of all modules participating in output is greater than the SOCM, and if so, adjust the output power of the master module or the slave module to be a second target output power according to a third formula and a fourth formula;
the third formula is:
the electric quantity adjusting power is equal to the average output power- (current electric quantity-SOCM) multiplied by a second adjusting coefficient;
the fourth formula is:
the second target output power is the electric quantity adjustment power, the first power/(the sum of the electric quantity adjustment power + the output power of the other module).
In this embodiment, the control method further includes: if the first power is less than the second power, only the main module discharges the load, and the main module comprises a first battery pack and a first inverter.
Example 7:
an energy storage device to which the power output control apparatus according to embodiment 7 is applied.
To sum up, the embodiment of the present invention provides a power output control method and apparatus for a high-power energy storage device, and an energy storage device, and has the following beneficial effects:
(1) through setting the master module and the slave module to coordinate the power output of the energy storage device, the overload or overpower protection of the inverter can be avoided, the service life of the inverter and the service life of a battery are prolonged, and the user experience is improved.
(2) And the number of the slave modules is judged, so that the overload of the inverters of the slave modules is avoided, and the stable output is ensured.
(3) And the output of different modules is optimized through temperature judgment and electric quantity judgment so as to stabilize the output power.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A power output control method of a high-power energy storage device is characterized by comprising the following steps:
acquiring first power required by a load and judging whether the first power is greater than rated second power of the first inverter or not;
if the first power is larger than the second power, the output of the master module is closed and the slave modules are controlled to enter a grid-connected output mode, and after the slave modules finish output preparation, the master module and the slave modules output the first power required by the load; the energy storage device comprises a master module and a plurality of slave modules.
2. The power output control method of the high-power energy storage device according to claim 1, wherein the output of the master module is turned off and the slave modules are controlled to enter a grid-connected output mode, specifically:
judging a first number of slave modules required when first power is output and sequencing the electric quantity of all the slave modules from large to small; and selecting slave modules with the ranking less than or equal to the first number to enter a grid-connected output mode.
3. The method according to claim 2, wherein the difference between the maximum output power that can be provided by the first number of slave modules and the second power after the master module is connected to the grid and the second power is greater than a first threshold.
4. The power output control method of a high power energy storage device according to claim 1, characterized in that the control method further comprises:
when the main module and the plurality of slave modules output first power required by the load together, judging whether the output power of each module is larger than the average output power, and if the output power of the main module or the slave modules is larger than the average output power, reducing the output power of the main module or the slave modules; and if the output power of the master module or the slave module is smaller than the average output power, increasing the output power of the master module or the slave module.
5. The method for controlling the power output of the high power energy storage device according to claim 4, wherein the method further comprises:
judging whether the current temperature of the master module or each slave module is greater than a first temperature, and if the current temperature of the master module or each slave module is greater than the first temperature, adjusting the output power of the master module or each slave module to be a first target output power according to a first formula and a second formula;
the first formula is:
the temperature adjusting power is the average output power- (current temperature-first temperature) multiplied by a first adjusting coefficient;
the second formula is:
the first target output power is the temperature-adjusted power plus the first power/(the sum of the temperature-adjusted power + the output power of the other module).
6. The method according to claim 5, wherein the temperature adjustment power is greater than or equal to a preset minimum output power, and if the obtained temperature adjustment power is less than the minimum output power, the value of the temperature adjustment power is directly the minimum output power.
7. The method for controlling the power output of the high power energy storage device according to claim 4, wherein the method further comprises:
judging whether the difference value between the current electric quantity of each module and the average electric quantity of all the modules participating in output is larger than the SOCM, and if so, adjusting the output power of the master module or the slave module to be a second target output power according to a third formula and a fourth formula;
the third formula is:
the electric quantity adjusting power is equal to the average output power- (current electric quantity-SOCM) < second adjusting coefficient;
the fourth formula is:
the second target output power is the electric quantity adjustment power, the first power/(the sum of the electric quantity adjustment power + the output power of the other module).
8. The power output control method of a high power energy storage device according to claim 1, characterized in that the control method further comprises: if the first power is less than the second power, only the main module discharges the load, and the main module comprises a first battery pack and a first inverter.
9. A power output control apparatus for a high power energy storage device, comprising: the device comprises a first acquisition module and a first processing module;
the first obtaining module is used for obtaining first power required by a load and judging whether the first power is larger than rated second power of the first inverter or not;
the first processing module is used for closing the output of the master module and controlling the slave modules to enter a grid-connected output mode if the first power is larger than the second power, and when the slave modules finish output preparation, the master module and the slave modules output the first power required by the load; the energy storage device comprises a master module and a plurality of slave modules.
10. An energy storage device characterized by applying the power output control apparatus according to claim 9.
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| CN202210441257.5A CN114678896A (en) | 2022-04-25 | 2022-04-25 | Power output control method and device of high-power energy storage equipment and energy storage equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116111692A (en) * | 2023-03-14 | 2023-05-12 | 深圳市拓普泰克技术股份有限公司 | Outdoor portable energy storage power supply control system |
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2022
- 2022-04-25 CN CN202210441257.5A patent/CN114678896A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116111692A (en) * | 2023-03-14 | 2023-05-12 | 深圳市拓普泰克技术股份有限公司 | Outdoor portable energy storage power supply control system |
| CN116111692B (en) * | 2023-03-14 | 2023-09-29 | 深圳市拓普泰克技术股份有限公司 | Outdoor portable energy storage power supply control system |
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