CN117639023B - Automatic off-grid switching control method for distributed energy storage system - Google Patents
Automatic off-grid switching control method for distributed energy storage system Download PDFInfo
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Abstract
The invention relates to the technical field of electric energy management, and discloses an automatic off-grid switching control method of a distributed energy storage system, which comprises the following steps: determining a current working mode of the distributed energy storage system; judging the charge and discharge states of the distributed energy storage system when the current working mode of the distributed energy storage system is a grid-connected mode, and judging whether a micro-grid in which the distributed energy storage system is positioned is switched to an off-grid mode according to the charge and discharge states of the distributed energy storage system; if the distributed energy storage system is not in a charging state, monitoring the generated power of a distributed power supply in the micro-grid, and if the generated power is larger than the set power in the public power grid, switching the micro-grid to an off-grid mode; when the current working mode of the distributed energy storage system is the off-grid mode, judging whether the distributed energy storage system accords with grid-connected conditions or not when a grid-connected instruction is acquired, and if so, switching the micro-grid into the grid-connected mode. The automatic off-grid switching can be realized according to the influence on the public power grid when the distributed energy storage system is off-grid.
Description
Technical Field
The invention relates to the technical field of electric energy management, in particular to an automatic off-grid switching control method of a distributed energy storage system.
Background
When the distributed energy storage system is in the micro-grid, two working modes of grid connection and off-grid operation are needed, and switching between the two working modes needs to be as smooth as possible, so that impact and influence on a user or the grid are reduced. The distributed energy storage system consists of an energy storage battery, an energy storage converter and a battery management system; in a grid-connected mode (the micro-grid is connected to the public grid), the distributed energy storage system is connected to the public grid, and the mode is commonly used for peak clipping and valley filling, power load balancing and power quality adjustment; in off-grid mode (with the microgrid disconnected from the utility grid), the distributed energy storage system is disconnected from the utility grid, which is commonly used to provide primary power to the microgrid.
In the prior art, when a distributed power supply and a distributed energy storage system are connected into a public power grid, the change of the generated power of the distributed power supply can affect the public power grid, the distributed energy storage system can be used for adjusting, but when the generated power of the distributed power supply exceeds the bearing capacity of the public power grid, the adjustment cannot be performed, so that the public power grid is affected; in addition, the adjustment balance capacity of the distributed energy storage system is not predicted in the grid connection process, so that the influence of the change of the generated power of the distributed power supply on the public power grid is unknown after the grid connection is completed.
Therefore, there is a need to propose an automatic off-grid switching control method for a distributed energy storage system, so as to at least partially solve the problems in the prior art.
Disclosure of Invention
In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to at least partially solve the above problems, the present invention provides an automatic off-grid switching control method for a distributed energy storage system, including:
determining a current working mode of the distributed energy storage system;
judging the charge and discharge states of the distributed energy storage system when the current working mode of the distributed energy storage system is a grid-connected mode, and judging whether a micro-grid in which the distributed energy storage system is positioned is switched to an off-grid mode according to the charge and discharge states of the distributed energy storage system;
if the distributed energy storage system is not in a charging state, monitoring the generated power of a distributed power supply in the micro-grid, and if the generated power is larger than the set power in the public power grid, switching the micro-grid to an off-grid mode;
when the current working mode of the distributed energy storage system is the off-grid mode, judging whether the distributed energy storage system accords with grid-connected conditions or not when a grid-connected instruction is acquired, and if so, switching the micro-grid into the grid-connected mode.
Preferably, when the current working mode of the distributed energy storage system is an off-grid mode and a grid-connected instruction is acquired, judging whether the distributed energy storage system meets grid-connected conditions, if so, switching the micro-grid to the grid-connected mode, including:
when a grid-connected instruction is acquired, determining the total power which can be supplied by the distributed power supply and the distributed energy storage system;
judging whether the total power is larger than the required power of the public power grid, if so, judging whether the charge states of a plurality of energy storage units in the distributed energy storage system can balance the power required by the public power grid and the change of the generated power of the distributed power source, and if so, switching the micro power grid to a grid-connected mode if the distributed energy storage system meets grid-connected conditions.
Preferably, determining whether the states of charge of the plurality of energy storage units in the distributed energy storage system are capable of balancing the power required by the utility grid and the variation in the generated power of the distributed power source includes:
determining initial power generation power of the distributed power supply after the micro-grid is switched to a grid-connected mode according to predicted required power of the public power grid and predicted power generation power of the distributed power supply;
obtaining a first variation difference of the generated power variation of the distributed power supply and the required power variation of the public power grid according to the actual required power of the public power grid and the actual generated power of the distributed power supply;
predicting the variation difference in the next grid-connected period according to the first variation difference in the last grid-connected period to obtain a second variation difference;
determining whether the output power of the plurality of energy storage units in the distributed energy storage system can balance the second variation difference according to the obtained charge states of the plurality of energy storage units and the second variation difference;
if not, the distributed energy storage system does not meet the grid-connected condition, if so, the distributed energy storage system meets the grid-connected condition, and the initial power generation of the distributed power supply is continuously optimized.
Preferably, continuing to optimize the initial generated power of the distributed power source includes:
and obtaining a third variation difference according to the first variation difference, and optimizing the initial power generation of the distributed power supply in the next grid-connected period by taking the transformation from the second variation difference to the third variation difference as a target to obtain the optimized initial power generation.
Preferably, optimizing the initial generated power of the distributed power supply in the next grid-connected period with the second variation difference amount being converted to the third variation difference amount as a target includes:
determining a first total variation difference of the second variation differences and a second total variation difference of the third variation differences in a grid-connected period;
obtaining the variation of the total variation difference according to the difference between the first total variation difference and the second total variation difference;
obtaining a variation average value of the total variation according to the ratio of the variation of the total variation to the grid-connected period;
and obtaining the optimized initial power according to the sum of the variation average value of the total variation and the initial power of the distributed power supply during grid connection.
Preferably, the method further comprises: and judging the positive and negative of the variation average value of the continuous total variation difference amounts, and if the variation average value is positive or negative, determining the initial power of the distributed power supply after the micro power grid is switched to the grid-connected mode again according to the predicted required power of the public power grid and the predicted power of the distributed power supply.
Preferably, the first variation difference is a sum of a required power prediction difference of the public power grid and a generated power prediction difference of the distributed power source.
Preferably, the required power prediction delta of the public power grid is the difference between the predicted required power and the actual required power of the public power grid; the generated power prediction difference of the distributed power supply is the difference between the actual generated power and the initial generated power of the distributed power supply.
Preferably, the set power in the public power grid is the maximum power that the public power grid can bear.
Preferably, before switching the micro grid to the off-grid mode, the method further comprises:
acquiring charge states of a plurality of energy storage units in a distributed energy storage system;
predicting the running time of the load of the micro-grid by the energy storage unit with the largest percentage of the states of charge in the energy storage units;
and when the micro-grid three-dimensional operation is switched to the off-grid mode, selecting the energy storage unit to supply power for the micro-grid three-dimensional operation in the predicted operation time, wherein the rest energy storage units are used for storing the generated energy of the distributed power supply.
Compared with the prior art, the invention at least comprises the following beneficial effects:
the automatic off-grid switching control method for the distributed energy storage system can realize automatic off-grid switching according to the influence on the public power grid when the distributed energy storage system is off-grid;
in the grid-connected mode, the charge and discharge states of the distributed energy storage system and the generated power of the distributed power supply are monitored at any time, and in order to reduce the influence of the generated power change of the distributed power supply on the public power grid, the distributed energy storage system is used for outputting balanced power, and once the generated power of the distributed power supply is larger than the set power of the public power grid, the grid-connected mode is automatically switched to the off-grid mode in order to reduce the influence, so that the impact on the public power grid is reduced;
if the power grid is in the off-grid mode, automatic grid-connected switching is performed according to the requirement of the public power grid, when a grid-connected instruction is acquired, whether the distributed energy storage system meets grid-connected conditions or not needs to be judged firstly, namely whether the distributed energy storage system has the capability of adjusting the change of the power generation power of the distributed power supply or not, if the capability is not provided, the grid-connected mode can have a large influence on the public power grid, the power quality is influenced, and if the capability is provided, the power grid-connected mode can be switched to, and the stable operation of the whole power grid after the grid connection is ensured.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of an automatic off-grid switching control method for a distributed energy storage system according to the present invention;
FIG. 2 is a flowchart showing a step S4 in the automatic off-grid switching control method of the distributed energy storage system according to the present invention;
fig. 3 is a specific flowchart of step S42 in the automatic off-grid switching control method of the distributed energy storage system according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings and examples to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1, the present invention provides an automatic off-network switching control method for a distributed energy storage system, which includes:
s1, determining a current working mode of a distributed energy storage system;
s2, judging the charge and discharge states of the distributed energy storage system when the current working mode of the distributed energy storage system is a grid-connected mode, and judging whether the micro-grid where the distributed energy storage system is located is switched to an off-grid mode according to the charge and discharge states of the distributed energy storage system;
s3, if the distributed energy storage system is not in a charging state, monitoring the generated power of the distributed power supply in the micro-grid, and if the generated power is larger than the set power in the public power grid, switching the micro-grid to an off-grid mode;
s4, judging whether the distributed energy storage system meets grid connection conditions or not when the current working mode of the distributed energy storage system is an off-grid mode and acquiring a grid connection instruction, and switching the micro-grid to the grid connection mode if the distributed energy storage system meets the grid connection conditions.
Further, the set power in the public power grid is the maximum power which can be born by the public power grid.
The current working mode of the distributed energy storage system is the current working mode of the micro-grid in which the distributed energy storage system is located, if the micro-grid is in a grid-connected mode, the charging and discharging states of the distributed energy storage system and the generated power of the distributed power supply are monitored at any time, and when the distributed energy storage system is not in a charging state, the generated power of the distributed power supply is monitored in real time; in the grid-connected stage, if the distributed energy storage system is in a charged state, the micro-grid indicates that redundant electric energy generated by the public power grid or electric energy generated by the distributed power supply needs to be stored in the distributed energy storage system, and the micro-grid does not output electric energy for the public power grid at the moment; when the distributed energy storage system is not in a charging state, the distributed power supply and the distributed energy storage system are indicated to output electric energy for the public power grid, and in order to reduce the influence of the generated power change of the distributed power supply on the public power grid, the distributed energy storage system is used for outputting balanced power, but once the generated power of the distributed power supply is larger than the set power of the public power grid, the distributed energy storage system cannot adjust the balance and is easy to impact the public power grid, so that the grid-connected mode is automatically switched to the off-grid mode to reduce the influence;
if the power grid is in the off-grid mode, automatic grid-connected switching is performed according to the requirement of the public power grid, when a grid-connected instruction is acquired, whether the distributed energy storage system meets grid-connected conditions or not needs to be judged firstly, namely whether the distributed energy storage system has the capability of adjusting the change of the power generation power of the distributed power supply or not, if the capability is not provided, the grid-connected mode can have a larger influence on the public power grid, the power quality is influenced, and if the capability is provided, the power grid-connected mode can be switched.
As shown in fig. 2, further, when the current working mode of the distributed energy storage system is the off-grid mode, and when the grid-connected instruction is acquired, judging whether the distributed energy storage system meets the grid-connected condition, if so, switching the micro-grid to the grid-connected mode, including:
s41, when a grid-connected instruction is acquired, determining the total power which can be supplied by the distributed power supply and the distributed energy storage system;
and S42, judging whether the total power is larger than the required power of the public power grid, if so, judging whether the charge states of a plurality of energy storage units in the distributed energy storage system can balance the power required by the public power grid and the change of the generated power of the distributed power source, and if so, switching the micro power grid into a grid-connected mode if the distributed energy storage system meets grid-connected conditions.
Before grid connection, determining whether the total power which can be supplied by the distributed power supply and the distributed energy storage system is larger than the required power of the public power grid, wherein the required power of the public power grid is the power load which needs to be born by the micro power grid, if the total power is larger than the required power of the public power grid, the electric energy stored in the distributed energy storage system and the generated energy of the distributed power supply are enough to support the power load of the public power grid, and continuing to judge the charge states of a plurality of energy storage units in the distributed energy storage system; the total amount of the states of charge of the energy storage units is referred to herein, if the states of charge of the energy storage units can balance the power required by the public power grid and the generated power of the distributed power source, it indicates that the distributed energy storage system has the capability of balancing the power variation, and can provide the power required by the public power grid stably in cooperation with the distributed power source, and if the above conditions are met, it indicates that the distributed energy storage system meets the grid-connected condition, and the power balance can be maintained by switching from the grid-off mode to the grid-connected mode, and can ensure the quality of providing electric energy for the public power grid.
As shown in fig. 3, further, determining whether the states of charge of the plurality of energy storage units in the distributed energy storage system can balance the power required by the public power grid and the change of the generated power of the distributed power source includes:
s421, determining initial power generation of the distributed power supply after the micro-grid is switched to a grid-connected mode according to the predicted required power of the public power grid and the predicted power generation power of the distributed power supply;
s422, obtaining a first variation difference of the generated power variation of the distributed power supply and the required power variation of the public power grid according to the actual required power of the public power grid and the actual generated power of the distributed power supply;
s423, predicting the variation difference in the next grid-connected period according to the first variation difference in the last grid-connected period to obtain a second variation difference;
s424, determining whether the output power of the plurality of energy storage units in the distributed energy storage system can balance the second variation difference according to the obtained charge states of the plurality of energy storage units and the second variation difference;
s425, if not, the distributed energy storage system does not meet the grid-connected condition, if so, the distributed energy storage system meets the grid-connected condition, and then the initial power generation power of the distributed power supply is continuously optimized.
After receiving a grid-connected instruction, predicting the required power of a public power grid, predicting the generated power of a distributed power supply, obtaining predicted required power and predicted generated power, and determining the initial generated power of the distributed power supply after switching from a grid-off mode to a grid-connected mode according to the predicted required power and the predicted generated power; according to the actual required power of the public power grid and the actual generated power of the distributed power supply, obtaining first variation difference which simultaneously considers the generated power variation of the distributed power supply and the required power variation of the public power grid, predicting variation difference in the next grid-connected period according to the first variation difference in the last grid-connected period to obtain second variation difference, wherein the grid-connected period is a period in which the micro-grid is switched from the grid-off mode to the grid-on mode and then is switched from the grid-on mode to the grid-off mode, the variation difference in the next grid-connected period can be predicted through the first variation difference in the last grid-on period, namely the obtained second variation difference, so that whether the charge states of a plurality of energy storage units can balance the power required by the public power grid and the generated power variation of the distributed power supply can be determined according to the second variation difference, if not, judging that the distributed energy storage system does not accord with grid-connected conditions, if yes, indicating that the grid-connected conditions are met, and therefore, the power balance can be maintained during grid-connected, and stable operation can be ensured;
then, in order to keep the charge states of a plurality of energy storage units in the distributed energy storage system relatively stable, the times and the amplitude of the balance power of the distributed energy storage system matched with the distributed power supply are reduced, the initial power generation power of the distributed power supply during grid connection is optimized, the energy consumption of the distributed energy storage system can be reduced, the amplitude of the adjustment of the power matched with the distributed energy storage system can be reduced by the optimized initial power generation power, and the accuracy of the power adjustment is improved.
Further, continuing to optimize the initial generated power of the distributed power source, including:
and obtaining a third variation difference according to the first variation difference, and optimizing the initial power generation of the distributed power supply in the next grid-connected period by taking the transformation from the second variation difference to the third variation difference as a target to obtain the optimized initial power generation.
Wherein the inverse number of the first variation difference is taken as a third variation difference;
further, optimizing the initial generated power of the distributed power supply in the next grid-connected period with the aim of converting the second variation difference amount into the third variation difference amount comprises the following steps:
respectively determining a first total variation difference of the second variation difference and a second total variation difference of the third variation difference in a grid-connected period by utilizing a calculus summation mode;
obtaining the variation of the total variation difference according to the difference between the first total variation difference and the second total variation difference;
obtaining a variation average value of the total variation according to the ratio of the variation of the total variation to the grid-connected period;
and obtaining the optimized initial power according to the sum of the variation average value of the total variation and the initial power of the distributed power supply during grid connection.
The variation of the total variation difference is divided into each time point in the grid-connected period, so that the variation characteristic of the initial power generation power of the grid-connected distributed power supply can be reserved, and the whole power grid cannot be interfered.
Further, the first variation difference is a sum of a required power prediction difference of the public power grid and a generated power prediction difference of the distributed power supply.
Further, the required power prediction difference of the public power grid is the difference between the predicted required power and the actual required power of the public power grid; the generated power prediction difference of the distributed power supply is the difference between the actual generated power and the initial generated power of the distributed power supply.
The second variation difference amount is converted into the third variation difference amount to be used as a target for optimally adjusting the initial power generation power of the distributed power supply in the next grid-connected period, so that the power variation in each grid-connected period can reach a certain balanced state, the charge states of a plurality of energy storage units in the distributed energy storage system can be kept relatively stable, the charge and discharge energy consumption of the distributed energy storage system can be reduced, the amplitude of the power adjustment of the distributed energy storage system can be reduced by the optimized initial power generation power, and the accuracy of the power adjustment is improved.
Further, the method further comprises the following steps: and judging the positive and negative of the variation average value of the continuous total variation difference amounts, and if the variation average value is positive or negative, determining the initial power of the distributed power supply after the micro power grid is switched to the grid-connected mode again according to the predicted required power of the public power grid and the predicted power of the distributed power supply.
When the average value of the variation amounts of the continuous total variation amounts is positive or negative, the initial power generation power of the distributed power supply in grid connection has larger error, if the initial power generation power is further adopted, the error is further increased, so that the initial power generation power of the distributed power supply needs to be determined again according to the predicted required power of the public power grid and the predicted power generation power of the distributed power supply, the error is reduced, the optimal initial power generation power is ensured to be obtained through optimization, the relative stability of the charge states of the energy storage units is further ensured, the charge and discharge energy consumption is reduced, and the power adjustment precision is improved.
Of course, if the variation averages of the continuous total variation amounts are alternately changed in positive and negative, there is a variation amplitude, and the variation amplitude of the variation averages of the continuous total variation amounts is compensated to reduce or cancel the variation amplitude, so that the variation amplitude is prevented from being excessively large.
In one embodiment, before switching the micro-grid to off-grid mode, further comprising:
acquiring charge states of a plurality of energy storage units in a distributed energy storage system;
predicting the running time of the load of the micro-grid by the energy storage unit with the largest percentage of the states of charge in the energy storage units;
and when the micro-grid three-dimensional operation is switched to the off-grid mode, selecting the energy storage unit to supply power for the micro-grid three-dimensional operation in the predicted operation time, wherein the rest energy storage units are used for storing the generated energy of the distributed power supply.
After the micro-grid is switched to the off-grid mode, stable operation of the micro-grid is required to be maintained, so that before the micro-grid is off-grid, the states of charge of a plurality of energy storage units in the distributed energy storage system are required to be acquired, then one energy storage unit with the largest percentage of the states of charge is selected as a power supply for maintaining the operation of the micro-grid, and the remaining energy storage units are used for storing the generated energy of the distributed power supply; therefore, the energy storage stage can be ensured to be maintained for a long time through one energy storage unit, and the stable operation of a plurality of energy storage units is ensured.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. The automatic off-grid switching control method for the distributed energy storage system is characterized by comprising the following steps of:
determining a current working mode of the distributed energy storage system;
judging the charge and discharge states of the distributed energy storage system when the current working mode of the distributed energy storage system is a grid-connected mode, and judging whether a micro-grid in which the distributed energy storage system is positioned is switched to an off-grid mode according to the charge and discharge states of the distributed energy storage system;
if the distributed energy storage system is not in a charging state, monitoring the generated power of a distributed power supply in the micro-grid, and if the generated power is larger than the set power in the public power grid, switching the micro-grid to an off-grid mode;
when the current working mode of the distributed energy storage system is an off-grid mode, judging whether the distributed energy storage system accords with grid-connected conditions or not when a grid-connected instruction is acquired, and if so, switching the micro-grid into the grid-connected mode;
when the current working mode of the distributed energy storage system is the off-grid mode and the grid-connected instruction is acquired, judging whether the distributed energy storage system meets the grid-connected condition, and if so, switching the micro-grid to the grid-connected mode, wherein the method comprises the following steps:
when a grid-connected instruction is acquired, determining the total power which can be supplied by the distributed power supply and the distributed energy storage system;
judging whether the total power is larger than the required power of the public power grid, if so, judging whether the charge states of a plurality of energy storage units in the distributed energy storage system can balance the power required by the public power grid and the change of the generated power of the distributed power source, and if so, switching the micro power grid to a grid-connected mode if the distributed energy storage system meets grid-connected conditions;
determining whether the states of charge of a plurality of energy storage units in the distributed energy storage system can balance the power required by the public power grid and the change of the generated power of the distributed power supply comprises the following steps:
determining initial power generation power of the distributed power supply after the micro-grid is switched to a grid-connected mode according to predicted required power of the public power grid and predicted power generation power of the distributed power supply;
obtaining a first variation difference of the generated power variation of the distributed power supply and the required power variation of the public power grid according to the actual required power of the public power grid and the actual generated power of the distributed power supply;
predicting the variation difference in the next grid-connected period according to the first variation difference in the last grid-connected period to obtain a second variation difference;
determining whether the output power of the plurality of energy storage units in the distributed energy storage system can balance the second variation difference according to the obtained charge states of the plurality of energy storage units and the second variation difference;
if not, the distributed energy storage system does not meet the grid-connected condition, if so, the distributed energy storage system meets the grid-connected condition, and the initial power generation of the distributed power supply is continuously optimized.
2. The method for automatic off-grid switching control of a distributed energy storage system according to claim 1, wherein continuing to optimize the initial generated power of the distributed power source comprises:
and obtaining a third variation difference according to the first variation difference, and optimizing the initial power generation of the distributed power supply in the next grid-connected period by taking the transformation from the second variation difference to the third variation difference as a target to obtain the optimized initial power generation.
3. The method of claim 2, wherein optimizing the initial generated power of the distributed power source in the next grid-connected period with the second variation difference transformed to the third variation difference as a target comprises:
determining a first total variation difference of the second variation differences and a second total variation difference of the third variation differences in a grid-connected period;
obtaining the variation of the total variation difference according to the difference between the first total variation difference and the second total variation difference;
obtaining a variation average value of the total variation according to the ratio of the variation of the total variation to the grid-connected period;
and obtaining the optimized initial power according to the sum of the variation average value of the total variation and the initial power of the distributed power supply during grid connection.
4. The method for controlling automatic off-grid switching of a distributed energy storage system according to claim 3, further comprising: and judging the positive and negative of the variation average value of the continuous total variation difference amounts, and if the variation average value is positive or negative, determining the initial power of the distributed power supply after the micro power grid is switched to the grid-connected mode again according to the predicted required power of the public power grid and the predicted power of the distributed power supply.
5. The method of claim 2, wherein the first variation difference is a sum of a desired power prediction difference of a utility grid and a generated power prediction difference of a distributed power source.
6. The method for automatic grid-connected/disconnected switching control of a distributed energy storage system according to claim 5, wherein the required power prediction delta of the public power grid is a difference between predicted required power and actual required power of the public power grid; the generated power prediction difference of the distributed power supply is the difference between the actual generated power and the initial generated power of the distributed power supply.
7. The method for automatic off-grid switching control of a distributed energy storage system according to claim 1, wherein the set power in the public power grid is a maximum power that can be born by the public power grid.
8. The method of claim 1, further comprising, prior to switching the microgrid to the off-grid mode:
acquiring charge states of a plurality of energy storage units in a distributed energy storage system;
predicting the running time of the load of the micro-grid by the energy storage unit with the largest percentage of the states of charge in the energy storage units;
and when the micro-grid three-dimensional operation is switched to the off-grid mode, selecting the energy storage unit to supply power for the micro-grid three-dimensional operation in the predicted operation time, wherein the rest energy storage units are used for storing the generated energy of the distributed power supply.
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