CN116566020B

CN116566020B - Charging and discharging power control method and device of energy storage system

Info

Publication number: CN116566020B
Application number: CN202310816735.0A
Authority: CN
Inventors: 简永楠
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-07-05
Filing date: 2023-07-05
Publication date: 2023-09-12
Anticipated expiration: 2043-07-05
Also published as: CN116566020A

Abstract

The application provides a charge and discharge power control method and a charge and discharge power control device of an energy storage system. By adopting the method, the charging and discharging power of the energy storage converter can be regulated differently when the load of a user is continuously changed, so that not only can the overload of the input transformer be prevented, but also the operation efficiency of the input transformer can be improved, thereby reducing the loss of the input transformer of a customer and improving the incremental income for the customer.

Description

Charging and discharging power control method and device of energy storage system

Technical Field

The present application relates to the field of energy storage technologies, and in particular, to a method and an apparatus for controlling charge and discharge power of an energy storage system.

Background

The energy storage converter (Power Conversion System) is used for controlling the charging and discharging processes of the energy storage battery to perform alternating current-direct current conversion, and the current charging and discharging power control of the energy storage converter is mainly performed according to the capacity of the energy storage battery corresponding to the energy storage converter and the current charging and discharging time, but in the charging and discharging control process of the energy storage converter to the energy storage battery, the user load is continuously changed, and in order to avoid overload of the input transformer at the user side, a flexible charging and discharging power control mode of the energy storage converter is needed.

Disclosure of Invention

The application provides a charge and discharge power control method and a charge and discharge power control device for an energy storage system.

In a first aspect, the present application provides a method for controlling charge and discharge power of an energy storage system, where the method includes:

the method comprises the steps of obtaining a power consumption peak period, a power consumption valley period, an energy storage capacity corresponding to an energy storage converter, rated power of an input transformer, first power of the input transformer and a working mode of the energy storage converter; the first power is the power corresponding to the maximum efficiency of the input transformer;

if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management, the charging power of the energy storage converter is adjusted according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration; the second power is the power input to the transformer at the current moment; the off-peak time length is the time length of the power utilization off-peak time period corresponding to the current moment;

If the current moment is in the electricity consumption peak period and the working mode of the energy storage converter is discharge management, the discharge power of the energy storage converter is adjusted according to the comparison result between the first power and the second power, the energy storage capacity and the peak time; the peak time is the time of the electricity utilization peak time period corresponding to the current time.

According to the application, the charging and discharging power of the energy storage converter is adjusted by acquiring the electricity consumption peak time, the electricity consumption valley time, the energy storage capacity corresponding to the energy storage converter, the rated power of the input transformer and the first power of the input transformer and respectively through the parameters according to the time period of the current moment. By adopting the method, the charging and discharging power of the energy storage converter can be regulated differently when the load of a user is continuously changed, so that not only can the overload of the input transformer be prevented, but also the operation efficiency of the input transformer can be improved, thereby reducing the loss of the input transformer of a customer and improving the incremental income for the customer.

In one possible example, adjusting the charging power of the energy storage converter according to the comparison between the first power and the second power, the energy storage capacity, the rated power of the input transformer, and the off-peak period includes: under the condition that the first power is larger than or equal to the second power, determining the maximum power in the third power and the fourth power as the charging power of the energy storage converter; the third power is the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter under the condition that the first power is smaller than the second power; wherein the fifth power is an absolute value of a difference between the rated power of the input transformer and the first power.

In the application, under the condition that the comparison results between the first power and the second power are different, the discharge power of the energy storage converter is regulated differently according to the first power, the second power, the energy storage capacity and the valley duration. The maximum efficiency of the input transformer can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; through the mode, the purpose that the energy storage converter can fully charge the energy storage battery in the energy storage device in a charging period can be achieved, and therefore charging cost is reduced.

In one possible example, the method further comprises: obtaining target power corresponding to the maximum efficiency of the energy storage converter; adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration, comprising:

determining whether the third power is greater than the fourth power if the first power is greater than or equal to the second power; the third power is the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; if the third power is determined to be greater than or equal to the fourth power, determining the third power as the charging power of the energy storage converter; if the third power is smaller than the fourth power, determining whether the first condition is met; the first condition comprises that the fourth power is smaller than the target power, and the sum of the target power and the second power is smaller than or equal to the rated power of the input transformer; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; and if the first condition is not met, determining the fourth power as the charging power of the energy storage converter.

In one possible example, the method further comprises: obtaining target power corresponding to the maximum efficiency of the energy storage converter; adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration, comprising: determining whether a first condition is satisfied in the case that the first power is less than the second power; the first condition comprises that the fourth power is smaller than the target power, and the sum of the target power and the second power is smaller than or equal to the rated power of the input transformer; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; if the first condition is not met, determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter; wherein the fifth power is an absolute value of a difference between the rated power of the input transformer and the first power.

In the application, the target power corresponding to the rated power of the input transformer and the maximum efficiency of the energy storage converter is obtained, and the adjustment parameters of the target power and the rated power are added on the basis of adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the rated power of the input transformer and the valley duration. The maximum efficiency of the input transformer and the energy storage converter can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; and by introducing two parameters of energy storage capacity and valley duration, the energy storage converter is ensured to fully charge the energy storage battery in the energy storage device in a charging period, so that the charging cost is reduced.

In one possible example, adjusting the discharge power of the energy storage converter according to the comparison between the first power and the second power, the energy storage capacity, and the peak time period includes: determining the minimum power of the sixth power and the second power as the discharge power of the energy storage converter under the condition that the first power is larger than or equal to the second power; the sixth power is the ratio of the energy storage capacity to the peak time; under the condition that the first power is smaller than the second power, determining the maximum power in the sixth power and the third power as the discharge power of the energy storage converter; wherein the third power is the absolute value of the difference between the first power and the second power.

In the application, under the condition that the comparison results between the first power and the second power are different, the discharge power of the energy storage converter is regulated differently according to the first power, the second power, the energy storage capacity and the peak time. The maximum efficiency of the input transformer can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; and by introducing two parameters of energy storage capacity and peak time, the aim that the energy storage converter can discharge the electric energy of the energy storage battery in the energy storage device in the discharging period can be achieved, so that the discharging income is improved.

In one possible example, the method further comprises: obtaining target power corresponding to the maximum efficiency of the energy storage converter; adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time, comprising:

determining whether the third power is greater than or equal to the sixth power if the first power is less than the second power; the third power is the absolute value of the difference between the first power and the second power, and the sixth power is the ratio of the energy storage capacity to the peak time; if the third power is determined to be greater than or equal to the sixth power, determining whether a second condition is met, wherein the second condition comprises that the third power is greater than or equal to the target power, and the target power is greater than or equal to the sixth power; if the second condition is determined to be met, determining the target power as the discharge power of the energy storage converter; if the second condition is not met, determining the third power as the discharge power of the energy storage converter; and if the third power is smaller than the sixth power, determining the sixth power as the discharge power of the energy storage converter.

In the application, the target power corresponding to the maximum efficiency of the energy storage converter is obtained, and the adjustment parameter of the target power is added on the basis of adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time. The maximum efficiency of the input transformer and the energy storage converter can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; and by introducing two parameters of energy storage capacity and peak time, the aim that the energy storage converter can discharge the electric energy of the energy storage battery in the energy storage device in the discharging period can be achieved, so that the discharging income is improved.

In one possible example, after adjusting the charging power of the energy storage converter according to the comparison between the first power and the second power, the energy storage capacity, and the off-peak period, the method further includes: and if the total charging power of the energy storage converter is determined to reach the energy storage capacity according to the charging power of the energy storage converter, controlling the energy storage converter to stop running.

In the application, if the total amount of the charging power of the energy storage converter is determined to reach the energy storage capacity according to the charging power of the energy storage converter, the energy storage converter is controlled to stop running. Therefore, the overload of battery charging can be prevented, and the charging safety of the energy storage converter is improved.

In one possible example, after adjusting the discharge power of the energy storage converter according to the comparison between the first power and the second power, the energy storage capacity, and the peak time period, the method further comprises: and if the total discharge power of the energy storage converter is determined to reach the energy storage capacity according to the discharge power of the energy storage converter, controlling the energy storage converter to stop running.

In the application, if the total discharge power of the energy storage converter is determined to reach the energy storage capacity according to the discharge power of the energy storage converter, the energy storage converter is controlled to stop running. Therefore, the energy storage converter can be prevented from malfunctioning, and the safety of the energy storage converter in discharging the energy storage device is improved.

In a second aspect, the present application provides a charge and discharge power control device for an energy storage system, the device being applied to an energy management system, the energy management system being connected to an energy storage converter, both the energy storage converter and an input transformer being connected to a utility grid bus, the device comprising:

the power supply system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a power consumption peak period, a power consumption valley period, energy storage capacity corresponding to an energy storage converter, rated power of an input transformer, first power of the input transformer and working modes of the energy storage converter; the first power is the power corresponding to the maximum efficiency of the input transformer;

the processing unit is used for adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management; the second power is the power input to the transformer at the current moment; the off-peak time length is the time length of the power utilization off-peak time period corresponding to the current moment;

the processing unit is used for adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time if the current moment is in the electricity consumption peak time period and the working mode of the energy storage converter is discharge management; the peak time is the time of the electricity utilization peak time period corresponding to the current time.

In a third aspect, the present application provides an electronic device comprising a processor, a memory, a communication interface, the processor, the memory and the communication interface being interconnected and performing communication therebetween, the memory having executable program code stored thereon, the communication interface being for wireless communication, the processor being for retrieving the executable program code stored thereon and performing some or all of the steps as described in any one of the methods of the first aspect, for example.

In a fourth aspect, the present application provides an energy storage system comprising an energy storage converter, an energy management system, a metering device, and an input transformer; the energy management system is respectively connected with the energy storage converter and the input transformer, and the metering device is arranged between the input transformer and the energy management system;

the metering device is used for measuring the second power input into the transformer at the current moment and transmitting the second power to the energy management system;

the energy management system is used for acquiring power consumption peak time, power consumption valley time, energy storage capacity corresponding to the energy storage converter, rated power of the input transformer, first power of the input transformer and working mode of the energy storage converter; the first power is the power corresponding to the maximum efficiency of the input transformer;

The energy management system is used for adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management; the low valley time length is the time length of the electricity utilization low valley time period corresponding to the current moment;

the energy management system is used for adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time if the current moment is in the electricity consumption peak time period and the working mode of the energy storage converter is discharge management; the peak time is the time of the electricity utilization peak time period corresponding to the current time.

In a fifth aspect, the present application provides a computer readable storage medium having stored therein electronic data which, when executed by a processor, is adapted to carry out the electronic data to carry out some or all of the steps described in the first aspect of the application.

In a sixth aspect, the present application provides a computer program product, wherein the computer program product comprises a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform part or all of the steps described in the first aspect of the application. The computer program product may be a software installation package.

Drawings

In order to more clearly illustrate the application or the technical solutions of the prior art, the drawings which are used in the examples or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some examples of the application and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an energy storage system according to the present application;

fig. 2 is a schematic flow chart of a method for controlling charge and discharge power of an energy storage system according to the present application;

FIG. 3 is a schematic diagram of a graph corresponding to an efficiency function of an input transformer according to the present application;

fig. 4 is a schematic diagram of a graph corresponding to an efficiency function of an energy storage converter according to the present application;

FIG. 5a is a functional block diagram of a charge-discharge power control device of an energy storage system according to the present application;

FIG. 5b is a functional block diagram of a charge and discharge power control device of an energy storage system according to the present application;

fig. 6 is a block diagram of an electronic device according to the present application.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution thereof will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described examples are only a part of examples of the present application, not all examples. All other examples, which a person of ordinary skill in the art would obtain without undue burden based on the examples in this disclosure, are within the scope of this disclosure.

The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps is not limited to the elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an example" means that a particular feature, structure, or characteristic described in connection with the example may be included in at least one example of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same example, nor are separate or alternative examples mutually exclusive of other examples. Those skilled in the art will explicitly and implicitly understand that the examples described herein may be combined with other examples.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an energy storage system according to the present application, and as shown in fig. 1, the energy storage system includes an energy storage converter 101, an energy management system 102, a metering device 103, an input transformer 104, a consumer load 105, a consumer power grid bus 106, a public power grid bus 107 and an energy storage device 108. The public power grid bus 107 is connected with a power grid, is responsible for power transmission, is transmitted to the user power grid bus 106 through the input transformer 104, supplies power to the user load 105 in a low-valley stage, supplies power to the energy storage device 108 through the energy storage converter 101, supplies power to the user load 105 only in a peak stage, or supplies power to the user load 105 in cooperation with the energy storage device 108 under a grid connection condition.

The metering device 103 is connected between the customer grid bus 106 and the input transformer 104, and is used for measuring the power of the input transformer 104 in real time and transmitting the measurement result to the energy management system 102, and the energy management system 102 controls the charging power and the discharging power of the energy storage converter 101 through a control strategy. The greater the load on the consumer grid bus 106, and correspondingly the greater the power of the input transformer 104, within the rated power range of the input transformer 104, the load sources on the consumer grid bus 106 include the consumer load 105 and the energy storage converter 101 in charge management mode.

Based on this, the application provides a charge and discharge power control method of an energy storage system, and the application is described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a flow chart of a method for controlling charge and discharge power of an energy storage system according to the present application, as shown in fig. 2, the method includes the following steps:

step 201, obtaining a power consumption peak period, a power consumption valley period, an energy storage capacity corresponding to the energy storage converter, rated power of the input transformer, first power of the input transformer and a working mode of the energy storage converter.

The first power is the power corresponding to the maximum efficiency of the input transformer. The electricity consumption peak period and the electricity consumption valley period may have different periods in different regions. The electricity consumption peak period corresponds to a peak electricity consumption period in one day, and the electricity consumption valley period corresponds to a valley electricity consumption period in one day. And the electricity consumption peak period and the electricity consumption valley period may each have a plurality of discontinuous periods in one day. Illustratively, the daily electricity usage peak period may be [7: 00-11: 00], [19: 00-23: 00]. The energy storage capacity refers to the rated capacity of an energy storage battery in an energy storage device connected with the energy storage converter. The working modes of the energy storage converter comprise two modes of charging management and discharging management, and the energy storage converter is in AC/DC conversion under the charging management working mode; in the discharge management mode of operation, the energy storage converter is in DC/AC conversion.

The first power corresponding to the maximum efficiency of the input transformer may be obtained by an efficiency function of the input transformer. Referring to fig. 3, fig. 3 is a schematic diagram of a graph corresponding to an efficiency function of an input transformer, as shown in fig. 3, a horizontal axis of a coordinate axis is a load factor β1, a vertical axis is an efficiency η1, it can be seen that the efficiency curve is parabolic, an efficiency maximum value η1max is taken at a highest point, and power corresponding to the maximum efficiency of the input transformer can be determined according to the load factor β1max corresponding to the efficiency maximum value η1max.

Step 202, if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management, adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration.

The second power is the power input to the transformer at the current moment, refers to the power associated with the user load, and can be understood as the power input to the transformer under the condition that the energy storage converter does not work; the valley time length is the time length of the electricity utilization valley time period corresponding to the current moment. And in the electricity consumption valley period, the corresponding working mode of the energy storage converter is discharge management. Illustratively, if the electricity usage valley period of the day includes [00: 00-07: 00], and the current time is 01:00, the period corresponding to the current moment is the electricity consumption low valley period, and the duration of the electricity consumption low valley period corresponding to the current period is 7 hours.

According to the efficiency curve corresponding to the efficiency function of the input transformer, when the load factor of the input transformer is smaller than the load factor corresponding to the maximum efficiency of the input transformer, the efficiency of the input transformer is in a faster rising trend along with the rising of the load factor; and under the condition that the load rate of the input transformer is larger than the load rate corresponding to the maximum efficiency of the input transformer, the load rate is continuously increased, so that the efficiency of the input transformer is gradually reduced. Since the load factor of the input transformer is positively correlated with the power of the input transformer, when the second power of the input transformer is smaller than the first power corresponding to the maximum efficiency of the input transformer, the power of the corresponding input transformer is increased along with the increase of the load factor of the input transformer, and the efficiency of the input transformer is correspondingly increased. When the energy storage converter is in a charging stage, the energy storage device can absorb part of electric energy output to a bus of the user power grid by the input transformer, and the energy storage device at the moment belongs to the load of the input transformer at the output end. Therefore, the charging power of the energy storage converter is proportional to the power input to the transformer.

Therefore, in the case that the first power of the input transformer is greater than the second power of the input transformer, in order to make the current power of the input transformer reach the first power, the efficiency of the input transformer is maximized, and the charging power of the energy storage converter can be adjusted to be the difference between the first power and the second power. However, in order to ensure that the energy storage converter can fully charge the energy storage device in the current electricity consumption valley period, the charging power of the energy storage converter needs to be greater than or equal to the ratio of the energy storage capacity to the valley period.

When the first power of the input transformer is smaller than or equal to the second power of the input transformer, the larger the charging power of the energy storage converter is, the larger the corresponding load factor of the input transformer is, the larger the required power is, and the lower the efficiency of the input transformer is. At the same time, the power of the energy storage converter also needs to satisfy the condition that the energy storage converter is fully charged in the current electricity consumption valley period, and is smaller than the fifth power because the second power of the input transformer is too high, namely, the minimum power in the fifth power and the fourth power is determined to be the charging power of the energy storage converter.

In the application, under the condition that the comparison results between the first power and the second power are different, the discharge power of the energy storage converter is regulated differently according to the first power, the second power, the energy storage capacity and the valley duration. The maximum efficiency of the input transformer can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; through the mode, the purpose that the energy storage device can be fully charged by the energy storage converter in the charging period can be achieved, and therefore the charging cost is reduced.

In another possible example, the method further comprises: obtaining target power corresponding to the maximum efficiency of the energy storage converter; adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration, comprising:

determining whether the third power is greater than the fourth power if the first power is greater than or equal to the second power; the third power is the absolute value of the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; if the third power is determined to be greater than or equal to the fourth power, determining the third power as the charging power of the energy storage converter; if the third power is smaller than the fourth power, determining whether the first condition is met; the first condition comprises that the fourth power is smaller than the target power, and the sum of the target power and the second power is smaller than or equal to the rated power of the input transformer; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; and if the first condition is not met, determining the fourth power as the charging power of the energy storage converter.

In addition, in the case that the first power is smaller than the second power, determining whether the first condition is satisfied; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; and if the first condition is not met, determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter.

The present example considers the operation efficiency of the energy storage converter based on the foregoing example, where the operation efficiency of the energy storage converter may be determined according to an efficiency function, and the target power corresponding to the maximum efficiency of the energy storage converter may be determined according to the efficiency function. Referring to fig. 4, fig. 4 is a schematic diagram of a graph corresponding to an efficiency function of an energy storage converter according to the present application, as shown in fig. 4, a horizontal axis of a coordinate axis of the graph is a load factor β2, and a vertical axis is an efficiency η2, and it can be seen that the efficiency curve is parabolic, an efficiency maximum value η2max is taken at a highest point, and a power corresponding to a maximum efficiency of an input transformer can be determined according to the load factor β2max corresponding to the efficiency maximum value η2max.

Moreover, as can be seen from fig. 4, when the load factor β2 of the energy storage converter is smaller than the load factor β2max corresponding to the maximum efficiency point of the energy storage converter, if the load factor β2 of the energy storage converter is increased and does not exceed β2max, the efficiency η2 of the energy storage converter tends to rise relatively rapidly; when the load factor β2 of the energy storage converter is larger than the load factor β2max corresponding to the maximum efficiency of the energy storage converter, if the load factor β2 of the energy storage converter is increased at this time, the efficiency of the energy storage converter tends to be relatively slow.

The load factor of the energy storage converter is proportional to the charging power of the energy storage converter, as is the input transformer. And under the condition that the current power of the energy storage converter is smaller than the target power corresponding to the maximum efficiency of the energy storage converter, if the charging power of the energy storage converter is increased and does not exceed the target power at the moment, the efficiency of the energy storage converter is in an ascending trend. The present example controls the charging power of the energy storage converter by this characteristic of the energy storage converter.

Specifically, when the first power is equal to or higher than the second power, the efficiency of the input transformer increases when the power of the input transformer increases and is lower than the first power. The charging power of the energy storage converter can then be determined as the difference between the first power and the second power, i.e. the third power. It is still necessary to satisfy the condition that the energy storage device is fully charged in the current electricity consumption valley period, that is, the charging power of the energy storage converter needs to be greater than or equal to the ratio of the energy storage capacity to the valley period, that is, the fourth power. Therefore, when the third power is equal to or greater than the fourth power, the charging power of the energy storage converter may be determined to be the third power.

When the third power is smaller than the fourth power, if the charging power of the energy storage converter is determined as the fourth power, the efficiency of the input transformer is in an efficiency decreasing stage in the efficiency curve, but the decreasing trend is slower relative to the increasing stage, and the same is true for the energy storage converter, and the corresponding increasing stage of the efficiency of the energy storage converter is relatively faster. Therefore, when the third power is smaller than the fourth power, it is determined whether a first condition is satisfied, that is, whether the fourth power is smaller than the target power, and whether the sum of the target power and the second power is smaller than or equal to the rated power of the input transformer is determined, if it is determined that the first condition is satisfied, the charging power of the energy storage converter is determined to be the target power, the efficiency of the corresponding input transformer is reduced, the efficiency of the energy storage converter is increased, but the efficiency of the input transformer is reduced more slowly than the efficiency of the energy storage converter, so that the overall efficiency of the input transformer and the energy storage converter is increased. If the first condition is determined not to be met, the charging power of the energy storage converter still needs to be determined to be fourth power.

Similarly, if the first power is smaller than the second power, it needs to determine whether the first condition is satisfied, if the first condition is satisfied, the target power is determined as the charging power of the energy storage converter, and if the first condition is not satisfied, since the second power of the input transformer is too high at this time, it needs to determine that the minimum power of the fourth power and the fifth power is the charging power of the energy storage converter.

In the application, the target power corresponding to the rated power of the input transformer and the maximum efficiency of the energy storage converter is obtained, and the adjustment parameters of the target power and the rated power are added on the basis of adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the rated power of the input transformer and the valley duration. The maximum efficiency of the input transformer and the energy storage converter can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; and by introducing two parameters of energy storage capacity and valley duration, the energy storage converter is ensured to fully charge the energy storage device in a charging period, so that the charging cost is reduced.

In addition, in one possible example, after adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, and the off-peak period, the method further includes: and if the total charging power of the energy storage converter is determined to reach the energy storage capacity according to the charging power of the energy storage converter, controlling the energy storage converter to stop running.

After the charging power of the energy storage converter is adjusted through the above example, the energy storage device may be fully charged in advance in the current electricity consumption valley period according to the charging power of the energy storage converter, and then the energy storage converter needs to be controlled to stop running, otherwise, the battery is overloaded.

And 203, if the current moment is in the electricity consumption peak period and the working mode of the energy storage converter is discharge management, adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time.

The peak time is the time of the electricity utilization peak time period corresponding to the current time. And in the electricity consumption peak period, the corresponding working mode of the energy storage converter is a discharge management mode.

When the energy storage converter is in a discharging stage, the power of the input transformer is the user load minus the discharging power of the energy storage converter, and accordingly, when the first power is larger than or equal to the second power, increasing the discharging power of the energy storage converter is equal to reducing the power of the input transformer, and when the current stage, the power of the input transformer is reduced, and the efficiency of the corresponding input transformer is also reduced. The lowest discharge power of the energy storage converter can enable the efficiency of the input transformer to be relatively highest. In the discharging stage, the energy storage converter needs to meet the condition that the electric quantity of the energy storage device is discharged in the electricity consumption peak period, but meanwhile, the discharging power of the energy storage converter needs to be prevented from being too high, so that power feeding to a power grid is caused, namely, the minimum power in the sixth power and the second power is determined as the discharging power of the energy storage converter.

In the case that the first power is smaller than the second power, if the power of the input transformer is reduced and still larger than the first power, the corresponding efficiency of the input transformer is increased. Therefore, if the discharge power of the energy storage converter is determined to be the absolute value of the difference between the first power and the second power, i.e., the third power, in order to maximize the efficiency of the input transformer, the discharge power of the energy storage converter still needs to be equal to or greater than the sixth power.

In addition, in one possible example, the method further comprises: obtaining target power corresponding to the maximum efficiency of the energy storage converter; adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time, comprising:

determining the minimum power of the sixth power and the second power as the discharge power of the energy storage converter under the condition that the first power is larger than or equal to the second power; the sixth power is the ratio of the energy storage capacity to the peak time; determining whether a third power is greater than or equal to a sixth power when the first power is less than the second power, the third power being an absolute value of a difference between the first power and the second power; if the third power is determined to be greater than or equal to the sixth power, determining whether a second condition is met, wherein the second condition comprises that the third power is greater than or equal to the target power, and the target power is greater than or equal to the sixth power; if the second condition is determined to be met, determining the target power as the discharge power of the energy storage converter; if the second condition is not met, determining the third power as the discharge power of the energy storage converter; and if the third power is smaller than the sixth power, determining the sixth power as the discharge power of the energy storage converter.

Unlike the above example, the present example obtains a target power corresponding to the maximum efficiency of the energy storage converter, and adds the parameter to the adjustment process of the energy storage converter. Specifically, if the power input to the transformer is reduced when the first power is equal to or greater than the second power, the corresponding efficiency will also be reduced, and the efficiency of the input transformer in the current stage is reduced by a larger margin. In order to ensure that the efficiency of the input transformer can be relatively high, but at the same time it is necessary to prevent the energy storage converter from feeding the grid, the discharge power of the energy storage converter needs to be set to the minimum of the sixth power and the second power.

When the first power is smaller than the second power, if the power of the input transformer is increased, the corresponding efficiency will be reduced, but when the third power is smaller than the sixth power, the discharge power of the energy storage converter needs to be determined as the sixth power in order to ensure that the efficiency of the input transformer can be relatively larger. When the third power is equal to or greater than the sixth power, it is considered whether the second condition is satisfied, that is, whether the third power is equal to or greater than the target power, and whether the target power is equal to or greater than the sixth power. If the second condition is satisfied, the discharge power of the energy storage converter is set from the target power to the third power, the efficiency of the energy storage converter is relatively reduced, and in order to maximize the efficiency of the energy storage converter, the efficiency of the energy storage converter may be set to the target efficiency, and the efficiency of the input transformer is relatively reduced with respect to the efficiency when the discharge power of the energy storage converter is set to the third power, but the reduction is small. When the second condition is not satisfied, if the maximum efficiency of the energy storage converter needs to be ensured, the reduction of the efficiency of the input transformer is larger, and the overall efficiency is reduced, so that the discharge power of the energy storage converter only needs to be determined as the third power under the current condition.

In the self-application example, the target power corresponding to the maximum efficiency of the energy storage converter is obtained, and the adjustment parameter of the target power is added on the basis of adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time. The maximum efficiency of the input transformer and the energy storage converter can be ensured, and the overall operation efficiency of the energy storage converter and the input transformer is improved; and by introducing two parameters of energy storage capacity and peak time, the aim that the energy storage converter can discharge the electric energy of the energy storage battery in the energy storage device in the discharging period can be achieved, so that the discharging income is improved.

In addition, in one possible example, after adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, and the peak time, the method further includes: and if the total discharge power of the energy storage converter is determined to reach the energy storage capacity according to the discharge power of the energy storage converter, controlling the energy storage converter to stop running.

After the discharge power of the energy storage converter is adjusted through the above example, the discharge power of the energy storage converter may release the electric energy of the energy storage device in advance in the current peak period of electricity consumption, and at this time, the energy storage converter needs to be controlled to stop running, so as to prevent the energy storage converter from malfunctioning.

In the application, if the total discharge power of the energy storage converter is determined to reach the energy storage capacity according to the discharge power of the energy storage converter, the energy storage converter is controlled to stop running. Therefore, the energy storage converter can be prevented from being failed, and the discharge safety of the energy storage converter is improved.

It can be appreciated that the method for controlling the charge and discharge power of the energy storage system shown in fig. 2 can be implemented by the energy storage system shown in fig. 1.

In accordance with the above-mentioned example, referring to fig. 5a, fig. 5a is a functional unit block diagram of a charge-discharge power control device of an energy storage system according to the present application, and as shown in fig. 5a, a charge-discharge power control device 50 of an energy storage system includes:

An obtaining unit 501, configured to obtain a power consumption peak period, a power consumption valley period, an energy storage capacity corresponding to the energy storage converter, a rated power of the input transformer, a first power of the input transformer, and a working mode of the energy storage converter; the first power is the power corresponding to the maximum efficiency of the input transformer;

the processing unit 502 is configured to adjust the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer, and the valley duration if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management; the second power is the power input to the transformer at the current moment; the off-peak time length is the time length of the power utilization off-peak time period corresponding to the current moment;

the processing unit 502 is configured to adjust, if the current moment is in a peak electricity consumption period and the working mode of the energy storage converter is discharge management, the discharge power of the energy storage converter according to a comparison result between the first power and the second power, the energy storage capacity and the peak time; the peak time is the time of the electricity utilization peak time period corresponding to the current time.

In one possible example, the processing unit 502 is configured to adjust the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer, and the valley duration, and includes: under the condition that the first power is larger than or equal to the second power, determining the maximum power in the third power and the fourth power as the charging power of the energy storage converter; the third power is the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter under the condition that the first power is smaller than the second power; wherein the fifth power is an absolute value of a difference between the rated power of the input transformer and the first power.

In one possible example, the apparatus further comprises: an obtaining unit 501, configured to obtain a target power corresponding to a rated power of an input transformer and a maximum efficiency of an energy storage converter; the processing unit 502 is configured to adjust the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer, and the valley duration, and includes: determining whether the third power is greater than the fourth power if the first power is greater than or equal to the second power; the third power is the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; if the third power is determined to be greater than or equal to the fourth power, determining the third power as the charging power of the energy storage converter; if the third power is smaller than the fourth power, determining whether the first condition is met; the first condition comprises that the fourth power is smaller than the target power, and the sum of the target power and the second power is smaller than or equal to the rated power of the input transformer; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; and if the first condition is not met, determining the fourth power as the charging power of the energy storage converter.

Determining whether a first condition is satisfied in the case that the first power is less than the second power; the first condition comprises that the fourth power is smaller than the target power, and the sum of the target power and the second power is smaller than or equal to the rated power of the input transformer; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; if the first condition is not met, determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter; wherein the fifth power is an absolute value of a difference between the rated power of the input transformer and the first power.

In one possible example, the processing unit 502 is configured to adjust the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, and the peak time period, and includes: determining the minimum power of the sixth power and the second power as the discharge power of the energy storage converter under the condition that the first power is larger than or equal to the second power; the sixth power is the ratio of the energy storage capacity to the peak time; under the condition that the first power is smaller than the second power, determining the maximum power in the sixth power and the third power as the discharge power of the energy storage converter; wherein the third power is the absolute value of the difference between the first power and the second power.

In one possible example, the apparatus further comprises: an obtaining unit 501, configured to obtain a target power corresponding to a maximum efficiency of the energy storage converter; the processing unit 502 is configured to adjust the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, and the peak time, and includes:

In one possible example, after adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, and the off-peak period, the apparatus further includes: if it is determined that the total amount of the charging power of the energy storage converter reaches the energy storage capacity according to the charging power of the energy storage converter, the control unit 503 is configured to control the energy storage converter to stop operating.

In one possible example, after adjusting the discharge power of the energy storage converter according to the comparison between the first power and the second power, the energy storage capacity, and the peak time period, the apparatus further comprises: if it is determined that the total amount of discharge power of the energy storage converter reaches the energy storage capacity according to the discharge power of the energy storage converter, the control unit 503 is configured to control the energy storage converter to stop operating.

It can be understood that, since the method example and the apparatus example are different presentation forms of the same technical concept, the content of the method example portion in the present application should be synchronously adapted to the apparatus example portion, which is not described herein.

In the case of using integrated units, as shown in fig. 5b, fig. 5b is a functional unit composition block diagram of a charge and discharge power control device of an energy storage system provided by the present application. In fig. 5b, the charge-discharge power control device 51 of the energy storage system comprises: a processing module 512 and a communication module 511. The processing module 512 is configured to control and manage actions of the charge and discharge power control devices of the energy storage system, e.g., the steps of the acquisition unit 501, the processing unit 502, and the control unit 503, and/or other processes for performing the techniques described herein. The communication module 511 is used to support interactions between the charge and discharge power control devices of the energy storage system and other devices. As shown in fig. 5b, the charge and discharge power control device 51 of the energy storage system may further comprise a storage module 513, the storage module 513 being configured to store program code and data of the charge and discharge power control device of the energy storage system.

The processing module 512 may be a processor or controller, such as a central processing unit (Central Processing Unit, CPU), a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination that performs computing functions, e.g., including one or more microprocessors, a combination of a DSP and a microprocessor, and so forth. The communication module 511 may be a transceiver, an RF circuit, a communication interface, or the like. The memory module 513 may be a memory.

All relevant contents of each scenario related to the above method example may be cited to the functional description of the corresponding functional module, which is not described herein. The charge and discharge power control device 51 of the energy storage system may perform the charge and discharge power control method of the energy storage system shown in fig. 2.

The above examples may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the examples described above may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions in accordance with the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired or wireless means from one website site, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc. that contain one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

Fig. 6 is a block diagram of an electronic device according to the present application. As shown in fig. 6, the electronic device 600 may include one or more of the following components: a processor 601, a memory 602 coupled to the processor 601, wherein the memory 602 may store one or more computer programs that may be configured to implement the methods described in the examples above when executed by the one or more processors 601. The electronic device 600 may be a component in the energy storage system.

Processor 601 may include one or more processing cores. The processor 601 connects various portions of the overall electronic device 600 using various interfaces and lines, performs various functions of the electronic device 600 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 602, and invoking data stored in the memory 602. Alternatively, the processor 601 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field-Programmable gate array (FPGA), programmable Logic Array (PLA). The processor 601 may integrate one or a combination of several of a central processing unit (CentralProcessing Unit, CPU), an image processor (Graphics Processing Unit, GPU), and a modem, etc. It will be appreciated that the modem may not be integrated into the processor 601 and may be implemented solely by a single communication chip.

The Memory 602 may include random access Memory (Random Access Memory, RAM) or Read-Only Memory (ROM). Memory 602 may be used to store instructions, programs, code, a set of codes, or a set of instructions. The memory 602 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing examples of the respective methods described above, and the like. The storage data area may also store data created by the electronic device 600 in use, and the like.

It is to be appreciated that the electronic device 600 may include more or fewer structural elements than those described in the above-described block diagrams, including, for example, a power module, physical key, wiFi (Wireless Fidelity ) module, speaker, bluetooth module, sensor, etc., without limitation.

The present application provides a computer readable storage medium having stored therein program data which, when executed by a processor, is adapted to carry out part or all of the steps of a method of controlling charge and discharge power of any one of the energy storage systems described in the above method examples.

The present application also provides a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform part or all of the steps of a method of controlling charge and discharge power of an energy storage system as any one of the method examples described above. The computer program product may be a software installation package.

It should be noted that, for simplicity of description, the method examples of the charge and discharge power control method of any energy storage system are all described as a series of combinations of actions, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously according to the present application. Further, it should be understood by those skilled in the art that the examples described in the specification are preferred examples and that the actions involved are not necessarily required for the present application.

Although the application is described herein in connection with various examples, other variations to the disclosed examples can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the method example of controlling the charge and discharge power of an energy storage system described above may be accomplished by a program that instructs associated hardware, the program may be stored in a computer readable memory, the memory may comprise: flash disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.

The foregoing has described the present application in detail, and specific examples have been provided herein to illustrate the principles and embodiments of a method and apparatus for controlling charge and discharge power of an energy storage system, where the above illustration is only for aiding in understanding the method and core idea of the present application; meanwhile, as for those skilled in the art, according to the idea of the charge and discharge power control method and apparatus for an energy storage system of the present application, there are variations in the specific embodiments and application ranges, and in summary, the present disclosure should not be construed as limiting the present application.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, hardware products, and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be appreciated that any method that is controlled or configured to perform the method of controlling the charge and discharge power of an energy storage system according to the present application, such as the terminal of the above-described flowchart and the computer program product, falls within the scope of the related products described in the present application.

It will be apparent to those skilled in the art that various modifications and variations can be made in the method and apparatus for controlling charge and discharge power of an energy storage system provided by the present application without departing from the spirit and scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A method for controlling charge and discharge power of an energy storage system, the method comprising:

acquiring a power consumption peak period, a power consumption valley period, an energy storage capacity corresponding to an energy storage converter, rated power of an input transformer, first power of the input transformer and a working mode of the energy storage converter; the first power is the power corresponding to the maximum efficiency of the input transformer;

if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management, adjusting the charging power of the energy storage converter according to a comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley period; the second power is the power of the input transformer at the current moment; the off-peak time length is the time length of the power-on off-peak time period corresponding to the current moment;

If the current moment is in the electricity consumption peak period and the working mode of the energy storage converter is discharge management, the discharge power of the energy storage converter is adjusted according to a comparison result between the first power and the second power, the energy storage capacity and the peak time; the peak time is the time of the power utilization peak time corresponding to the current moment;

wherein the adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration comprises:

determining the maximum power of the third power and the fourth power as the charging power of the energy storage converter under the condition that the first power is larger than or equal to the second power; wherein the third power is the absolute value of the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration;

determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter under the condition that the first power is smaller than the second power; wherein the fifth power is an absolute value of a difference between a rated power of the input transformer and the first power;

Wherein said adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time period comprises:

determining that the minimum power of the sixth power and the second power is the discharge power of the energy storage converter under the condition that the first power is larger than or equal to the second power; wherein the sixth power is a ratio of the energy storage capacity to the peak time period;

and under the condition that the first power is smaller than the second power, determining the maximum power in the sixth power and the third power as the discharge power of the energy storage converter.

2. A method for controlling charge and discharge power of an energy storage system, the method comprising:

obtaining target power corresponding to the maximum efficiency of the energy storage converter;

determining whether a third power is greater than a fourth power if the first power is greater than or equal to the second power; wherein the third power is the absolute value of the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration;

if the third power is determined to be greater than or equal to the fourth power, determining that the third power is the charging power of the energy storage converter;

If the third power is smaller than the fourth power, determining whether a first condition is met; wherein the first condition includes that the fourth power is less than the target power, and the sum of the target power and the second power is less than or equal to the rated power of the input transformer;

if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter;

if the first condition is not met, determining that the fourth power is the charging power of the energy storage converter;

determining whether a first condition is satisfied if the first power is less than the second power;

if the first condition is not met, determining that the minimum power in the fourth power and the fifth power is the charging power of the energy storage converter; wherein the fifth power is an absolute value of a difference between a rated power of the input transformer and the first power;

determining whether a third power is equal to or greater than a sixth power if the first power is less than the second power;

if the third power is larger than or equal to the sixth power, determining whether a second condition is met, wherein the second condition comprises that the third power is larger than or equal to the target power, and the target power is larger than or equal to the sixth power;

if the second condition is determined to be met, determining that the target power is the discharge power of the energy storage converter;

if the second condition is not met, determining that the third power is the discharge power of the energy storage converter;

and if the third power is smaller than the sixth power, determining the sixth power as the discharge power of the energy storage converter.

3. The method according to claim 1 or 2, characterized in that after said adjusting the charging power of the energy storage converter according to the result of the comparison between the first power and the second power, the energy storage capacity and the off-peak period, the method further comprises:

And if the total amount of the charging power of the energy storage converter reaches the energy storage capacity according to the charging power of the energy storage converter, controlling the energy storage converter to stop running.

4. The method according to claim 1 or 2, characterized in that after adjusting the discharge power of the energy storage converter according to the comparison between the first power and the second power, the energy storage capacity and the peak time period, the method further comprises:

and if the total discharge power of the energy storage converter is determined to reach the energy storage capacity according to the discharge power of the energy storage converter, controlling the energy storage converter to stop running.

5. An energy storage system, wherein the system comprises an energy storage converter, an energy management system, a metering device and an input transformer; the energy management system is respectively connected with the energy storage converter and the input transformer, and the metering device is arranged between the input transformer and the energy management system;

the metering device is used for measuring second power of the input transformer at the current moment and transmitting the second power to the energy management system;

the energy management system is used for acquiring electricity consumption peak time, electricity consumption valley time, energy storage capacity corresponding to the energy storage converter, rated power of the input transformer, first power of the input transformer and working mode of the energy storage converter; the first power is the power corresponding to the maximum efficiency of the input transformer;

The energy management system is used for adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration if the current moment is in the electricity consumption valley period and the working mode of the energy storage converter is charging management; the off-peak time is the time of the power utilization off-peak period corresponding to the current moment;

the energy management system is used for adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time if the current moment is in the electricity consumption peak time period and the working mode of the energy storage converter is discharge management; the peak time is the time of the power utilization peak time corresponding to the current moment;

wherein the adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration comprises: determining the maximum power of the third power and the fourth power as the charging power of the energy storage converter under the condition that the first power is larger than or equal to the second power; wherein the third power is the absolute value of the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; determining the minimum power of the fourth power and the fifth power as the charging power of the energy storage converter under the condition that the first power is smaller than the second power; wherein the fifth power is an absolute value of a difference between a rated power of the input transformer and the first power;

Wherein said adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time period comprises: determining that the minimum power of the sixth power and the second power is the discharge power of the energy storage converter under the condition that the first power is larger than or equal to the second power; wherein the sixth power is a ratio of the energy storage capacity to the peak time period; and under the condition that the first power is smaller than the second power, determining the maximum power in the sixth power and the third power as the discharge power of the energy storage converter.

6. An energy storage system, wherein the system comprises an energy storage converter, an energy management system, a metering device and an input transformer; the energy management system is respectively connected with the energy storage converter and the input transformer, and the metering device is arranged between the input transformer and the energy management system;

the energy management system is further used for obtaining target power corresponding to the maximum efficiency of the energy storage converter;

wherein the adjusting the charging power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity, the rated power of the input transformer and the valley duration comprises: determining whether a third power is greater than a fourth power if the first power is greater than or equal to the second power; wherein the third power is the absolute value of the difference between the first power and the second power, and the fourth power is the ratio of the energy storage capacity to the valley duration; if the third power is determined to be greater than or equal to the fourth power, determining that the third power is the charging power of the energy storage converter; if the third power is smaller than the fourth power, determining whether a first condition is met; wherein the first condition includes that the fourth power is less than the target power, and the sum of the target power and the second power is less than or equal to the rated power of the input transformer; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; if the first condition is not met, determining that the fourth power is the charging power of the energy storage converter; determining whether a first condition is satisfied if the first power is less than the second power; if the first condition is determined to be met, determining that the target power is the charging power of the energy storage converter; if the first condition is not met, determining that the minimum power in the fourth power and the fifth power is the charging power of the energy storage converter; wherein the fifth power is an absolute value of a difference between a rated power of the input transformer and the first power;

Wherein said adjusting the discharge power of the energy storage converter according to the comparison result between the first power and the second power, the energy storage capacity and the peak time period comprises: determining that the minimum power of the sixth power and the second power is the discharge power of the energy storage converter under the condition that the first power is larger than or equal to the second power; wherein the sixth power is a ratio of the energy storage capacity to the peak time period; determining whether a third power is equal to or greater than a sixth power if the first power is less than the second power; if the third power is larger than or equal to the sixth power, determining whether a second condition is met, wherein the second condition comprises that the third power is larger than or equal to the target power, and the target power is larger than or equal to the sixth power; if the second condition is determined to be met, determining that the target power is the discharge power of the energy storage converter; if the second condition is not met, determining that the third power is the discharge power of the energy storage converter; and if the third power is smaller than the sixth power, determining the sixth power as the discharge power of the energy storage converter.

7. A computer-readable storage medium, characterized in that a computer program for electronic data exchange is stored, wherein the computer program causes a computer to perform the method according to any of claims 1-4.