Energy storage control method and related device

Abstract

The application provides a kind of energy storage control method and related device, in the beginning of the demand calculation period after configuring energy storage power station, obtain current maximum demand, in the case where the demand trend of target load of last demand calculation period is determined to meet the preset trend, the charging power of energy storage power station is calculated, and in the charging period, control the energy storage power station is charged according to the charging power operation, determine the real-time maximum demand at the end of the waiting period, in the case where the real-time maximum demand is less than the sum of the current maximum demand and the charging power, it is explained that the charging operation of energy storage power station leads to maximum demand increase, at this time, control the energy storage power station is discharged according to the charging power operation in the discharge period, to offset the part of maximum demand increase caused by the charging operation of energy storage power station, ensure that the charging operation of energy storage power station does not make maximum demand increase.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage control, and more particularly, to an energy storage control method and related device. BACKGROUND

[0002] Currently, the total electricity price is calculated based on the demand charge and the actual electricity consumption. When calculating the demand charge, the actual maximum demand of the last billing period is used for charging.

[0003] Generally, the actual maximum demand is the maximum demand of the current load of a site. If an energy storage power station is additionally configured at the site, the actual maximum demand of the site may increase due to the charging operation of the energy storage power station, thereby increasing the cost.

[0004] Therefore, how to ensure that the actual maximum demand does not increase when the energy storage power station is charging is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application provides an energy storage control method and related device to solve the problem of how to ensure that the actual maximum demand does not increase when the energy storage power station is charging.

[0006] To solve the above technical problems, the present application adopts the following technical solutions:

[0007] An energy storage control method applied to an energy storage controller, wherein the energy storage controller is configured with a demand calculation period, the demand calculation period includes a charging period, a waiting period and a discharging period arranged in time sequence; the time length of the discharging period is the same as that of the charging period; the energy storage control method comprises:

[0008] At the beginning of a demand calculation period after the energy storage power station is configured, the current maximum demand is obtained;

[0009] When it is determined that the demand trend of the target load of the last demand calculation period meets a preset trend, the charging power of the energy storage power station is calculated, and the energy storage power station is controlled to perform a charging operation according to the charging power in the charging period;

[0010] The real-time maximum demand at the end of the waiting period is determined;

[0011] When the real-time maximum demand is less than the sum of the current maximum demand and the charging power, the energy storage power station is controlled to perform a discharging operation according to the charging power in the discharging period.

[0012] Optionally, when it is determined that the demand trend of the target load of the last demand calculation period meets a preset trend, the following steps are included:

[0013] Obtain the demand value of the target load in the charging period, the waiting period and the discharging period of the last demand calculation period respectively; the target load is all the loads in the target site except the energy storage power station;

[0014] Determine whether the demand values of the charging period, the waiting period and the discharging period are in an increasing trend in time sequence;

[0015] If yes, it is determined that the demand trend of the target load in the last demand calculation period meets the preset trend.

[0016] Optionally, the charging power of the energy storage power station is calculated, comprising:

[0017] Determine whether the current time is within a preset time period;

[0018] If yes, determine the demand growth rate of the last demand calculation period;

[0019] Based on the demand growth rate and the current maximum demand, the charging power of the energy storage power station is calculated.

[0020] Optionally, determining whether the current time is within a preset time period comprises:

[0021] Obtain the current time and determine whether the current time is located in a valley time period or a flat time period.

[0022] Optionally, determining the demand growth rate of the last demand calculation period comprises:

[0023] Calculate the demand growth rate of adjacent periods in the charging period, the waiting period and the discharging period of the last demand calculation period;

[0024] Take the average value of the demand growth rate as the demand growth rate of the last demand calculation period.

[0025] Optionally, based on the demand growth rate and the current maximum demand, the charging power of the energy storage power station is calculated, comprising:

[0026] Take the product of the demand growth rate and the current maximum demand as the charging power of the energy storage power station.

[0027] Optionally, in the case that the demand calculation period is the second or subsequent demand calculation period after the energy storage power station is configured, before obtaining the current maximum demand at the beginning of the demand calculation period after the energy storage power station is configured, further comprising:

[0028] In the first demand calculation period after the energy storage power station is configured, control the charging and discharging power of the energy storage power station to be a preset power.

[0029] Optionally, in the case that the real-time maximum demand is not less than the sum of the current maximum demand and the charging power, further comprising:

[0030] updating the current maximum demand as the real-time maximum demand.

[0031] An energy storage control device applied to an energy storage controller, the energy storage controller being configured with a demand calculation period, the demand calculation period comprising a charging period, a waiting period and a discharging period arranged in time sequence; the discharging period has the same time length as the charging period; the energy storage control device comprises:

[0032] a demand acquisition module configured to acquire a current maximum demand at the beginning of a demand calculation period after the energy storage power station is configured;

[0033] a charging control module configured to calculate a charging power of the energy storage power station in the case that a demand trend of a target load of a previous demand calculation period meets a preset trend, and control the energy storage power station to perform a charging operation according to the charging power in the charging period;

[0034] a demand determination module configured to determine a real-time maximum demand at the end of the waiting period;

[0035] a discharging control module configured to control the energy storage power station to perform a discharging operation according to the charging power in the discharging period in the case that the real-time maximum demand is less than the sum of the current maximum demand and the charging power.

[0036] An energy storage controller comprising a memory and a processor;

[0037] The memory is configured to store a program.

[0038] The processor invokes the program and is configured to execute the above-mentioned energy storage control method.

[0039] An energy storage power station comprising the above-mentioned energy storage controller.

[0040] Compared with the prior art, the present application has the following beneficial effects:

[0041] The application provides a kind of energy storage control method and related device, in the need of quantity calculation period of configuration energy storage power station, obtain current maximum need, in the case where the need trend of target load of last need quantity calculation period is determined to meet the preset trend, the charging power of energy storage power station is calculated, and in the charging period, control the energy storage power station is charged according to the charging power operation, determine the real-time maximum need when the waiting period ends, in the case where the real-time maximum need is less than the sum of the current maximum need and the charging power, it is explained that the charging operation of energy storage power station leads to maximum need increase, at this time control energy storage power station is discharged according to the charging power in the discharge period, to offset the part of maximum need increase caused by the charging operation of energy storage power station, guarantee that the charging operation of energy storage power station does not make maximum need increase. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only a part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings.

[0043] Figure 1 An application scenario diagram of a kind of energy storage controller provided for the embodiments of the present application;

[0044] Figure 2 A method flow chart of a kind of energy storage control method provided for the embodiments of the present application;

[0045] Figure 3 A method flow chart of another kind of energy storage control method provided for the embodiments of the present application;

[0046] Figure 4 A structure diagram of a kind of energy storage control device provided for the embodiments of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0048] The two-part industrial electricity price divides the electricity price into a basic electricity price and a kilowatt-hour electricity price. The basic electricity price is calculated according to the transformer capacity or maximum demand (i.e. the maximum value of the average load per 15 minutes or 30 minutes in the middle of the month) of the industrial enterprise, and is determined by the power supply department and the electricity consumption department through a contract. The basic electricity price is fixed and collected every month, and is not affected by the actual electricity consumption. The kilowatt-hour electricity price is calculated according to the actual electricity consumption of the electricity consumption department. The calculation formula of the two-part electricity price is:

[0049] Total electricity price = basic electricity price (demand electricity fee) + kilowatt-hour electricity price (actual electricity consumption electricity fee)

[0050] The demand electricity fee (reported demand * demand unit price) is affected by the reported demand. The more the reported demand is, the more the demand electricity fee is. At present, there are three ways to report the demand. One is to report according to the rated capacity of the transformer. The second is to report a value by the customer. The third is to charge according to the maximum demand (charge the demand electricity fee according to the demand).

[0051] At present, there are more and more business scenarios of renting energy storage power stations. Before a certain site rents an energy storage power station, the maximum demand is the maximum demand of the existing load. If the site is additionally configured with an energy storage power station, the actual maximum demand of the site may increase due to the charging operation of the energy storage power station, thereby causing the cost to increase. For example, when the maximum demand of the existing load is 1kw, the energy storage power station charges, and the power is 500w. Therefore, the current maximum demand is 1.5kw. If the above 1kw is the maximum demand, the maximum demand increases due to the addition of the energy storage power station, so that the electricity price is calculated according to 1.5kw instead of 1kw, and the electricity fee increases.

[0052] Therefore, after the energy storage power station is added, how to ensure that the actual maximum demand does not increase is a technical problem that needs to be solved by those skilled in the art.

[0053] In order to solve this technical problem, the present application calculates the real-time maximum demand in the demand calculation period, and obtains the maximum demand target through an iterative method to control the charging and discharging of the energy storage, so as to ensure that the addition of the energy storage system does not affect the original maximum demand of the user, thereby not affecting the demand electricity fee of the user.

[0054] Specifically, the application provides a method for controlling energy storage and related devices, wherein at the beginning of a demand calculation period after configuring an energy storage power station, a current maximum demand is obtained, in a case where a demand trend of a target load of a previous demand calculation period meets a preset trend, a charging power of the energy storage power station is calculated, and in the charging period, the energy storage power station is controlled to perform a charging operation according to the charging power, a real-time maximum demand at the end of the waiting period is determined, and in a case where the real-time maximum demand is less than the sum of the current maximum demand and the charging power, it is indicated that the charging operation of the energy storage power station leads to an increase in the maximum demand, at this time, the energy storage power station is controlled to perform a discharging operation according to the charging power in the discharging period, so as to offset the part of the increase in the maximum demand caused by the charging operation of the energy storage power station, and ensure that the charging operation of the energy storage power station does not increase the maximum demand.

[0055] On the basis of the above, Figure 1 The embodiment of the application provides a method for controlling energy storage, which is applied to an energy storage controller, and a communication scenario of the energy storage controller refers to Figure 1 The specific working process is a conventional technical solution.

[0056] The energy storage controller is configured with a demand calculation period, the demand calculation period comprises a charging period, a waiting period and a discharging period arranged in time sequence, and the discharging period has the same time length as the charging period.

[0057] Generally, the demand calculation period is 15 minutes. Demand is a kind of power measurement, or exactly a kind of average power. The specified time interval is the demand calculation period. The demand calculation period generally adopts 15 minutes. For large industrial users, the fluctuation value of the load is very large. For example, for a large user, the maximum starting load is 1000 kW when working, and the load is reduced to 500 kW after 10 minutes, and the load is maintained for 5 minutes. Then the maximum demand of the large user in the demand calculation period is: total energy value (1000*10+500*5) / 15 minutes = 833.3 kW.

[0058] The demand calculation period comprises a charging period, a waiting period and a discharging period arranged in time sequence, and generally, the demand calculation period can be divided into three parts, that is, the charging period, the waiting period and the discharging period are 5 minutes in turn. That is to say, in the 15 minutes of the demand calculation period, the first 5 minutes is the charging period, the second 5 minutes is the waiting period, and the third 5 minutes is the discharging period.

[0059] In practical applications, the charging period, the waiting period and the discharging period can also not be equally divided, but the time length of the charging period and the discharging period needs to be ensured to be the same, so that when the maximum demand is increased due to the charging of the energy storage power station, the discharging operation of the energy storage power station in the discharging period can make the maximum demand increment caused by the charging of the energy storage power station decrease to zero. For example, the charging period is the first 6 minutes, the waiting period is the middle 3 minutes, and the discharging period is the last 6 minutes. The charging period makes the maximum demand increase by 0.5 kw, and the increased 0.5 kw is restored to zero through the discharging period.

[0060] With reference to Figure 2 , the energy storage control method comprises:

[0061] S11, at the beginning of a demand calculation period after the energy storage power station is configured, the current maximum demand is obtained.

[0062] In practical applications, the demand calculation period generally refers to the second demand calculation period or the demand calculation period after the energy storage power station is configured.

[0063] Generally, on the first day of the operation of the energy storage power station, the energy storage system does not perform any charging and discharging setting within the first 15 minutes of the operation of the energy storage system, i.e. in the first demand calculation period, and the charging and discharging power is zero, so that the actual demand change data can be obtained.

[0064] That is, in the case where the demand calculation period is the second or subsequent demand calculation period after the energy storage power station is configured, before obtaining the current maximum demand at the beginning of a demand calculation period after the energy storage power station is configured, the method further comprises:

[0065] In the first demand calculation period after the energy storage power station is configured, the charging and discharging power of the energy storage power station is controlled to be a preset power. The preset power is zero.

[0066] In the second or subsequent demand calculation period, the maximum demand of all previous demand calculation periods is obtained, which is recorded as the current maximum demand Pt.

[0067] S12, in the case where the demand trend of the target load of the previous demand calculation period meets a preset trend, the charging power of the energy storage power station is calculated, and the energy storage power station is controlled to perform a charging operation according to the charging power in the charging period.

[0068] Specifically, the preset trend generally refers to an increasing trend, and the target load refers to all loads in the target site except the energy storage power station.

[0069] In this embodiment, it is analyzed whether the demand trend of all loads except the energy storage power station is increasing. If it is increasing, the charging operation of the energy storage power station is attempted, and the charging operation of the energy storage power station increases the maximum demand in the current demand calculation period. After charging for a period of time (charging period), the energy storage power station stops charging for a period of time (waiting period), and it is determined whether the demand of the target load is also increasing. If the demand of the target load is not less than the sum of the demand of the load and the demand of the energy storage power station in the charging period, it is indicated that the demand of the target load will increase to the value after the energy storage power station is added even if the energy storage power station is not added, that is, it is indicated that the charging operation of the energy storage power station does not affect the maximum demand.

[0070] If the demand of the target load is less than the sum of the demand of the load and the demand of the energy storage power station in the charging period, it is indicated that the charging operation of the energy storage power station increases the maximum demand, and the previously increased demand part should be reduced again. In the discharging period, the energy storage power station is controlled to perform the discharging operation. The discharging power is the same as the charging power. That is, in the entire demand calculation period, the energy storage power station is first charged and then discharged, so that the total amount of charging and discharging is zero at the end. When the maximum demand is calculated, it is calculated according to a demand calculation period. Since the total amount of charging and discharging of the energy storage power station is zero in the period, the maximum demand is not affected, and the problem that the maximum demand increases due to the charging operation of the energy storage power station and the electricity cost increases is avoided.

[0071] In actual application, the demand trend of the target load in the previous demand calculation period satisfies the preset trend can include:

[0072] 1) The demand values of the target load in the charging period, the waiting period and the discharging period of the previous demand calculation period are respectively acquired.

[0073] That is, the demand values of the target load in the charging period, the waiting period and the discharging period are respectively acquired.

[0074] 2) It is determined whether the demand values of the charging period, the waiting period and the discharging period are in an increasing trend in time sequence.

[0075] That is, it is analyzed whether the demand values of the charging period, the waiting period and the discharging period are sequentially increasing.

[0076] 3) If yes, it is determined that the demand trend of the target load in the previous demand calculation period satisfies the preset trend.

[0077] If the demand trend is sequentially increasing, it is determined that the demand trend of the target load in the previous demand calculation period satisfies the preset trend, that is, the increasing trend.

[0078] If it is not the increasing trend, it is waited, and after the next demand calculation period, step S11 is re-executed.

[0079] After determining that the demand trend of the target load of the last demand calculation period meets the preset trend, the charging power of the energy storage power station is calculated, and the charging power of the energy storage power station is calculated with reference to Figure 3 , and specifically can include:

[0080] S21, determining whether the current time is within a preset time period; if yes, executing step S22.

[0081] Specifically, the preset time period is a valley time period or a flat time period, and the electricity price is cheap when charging in the valley time period or the flat time period. Therefore, in the embodiment, the charging time period of the energy storage power station is limited to the valley time period or the flat time period. In the embodiment, the current time is obtained, and it is determined whether the current time is located in the valley time period or the flat time period.

[0082] S22, determining the demand growth rate of the last demand calculation period.

[0083] Specifically, the demand growth rates of adjacent periods in the charging period, the waiting period and the discharging period in the last demand calculation period are calculated, and the average value of the demand growth rates is taken as the demand growth rate of the last demand calculation period.

[0084] In detail, the demand growth rates of the charging period and the waiting period are calculated, and specifically are (the demand value of the waiting period - the demand value of the charging period) / the demand value of the charging period.

[0085] Then, the demand growth rates of the waiting period and the discharging period are calculated.

[0086] The average value of the two calculated demand growth rates is taken as the demand growth rate K of the last demand calculation period.

[0087] S23, calculating the charging power of the energy storage power station based on the demand growth rate and the current maximum demand.

[0088] Specifically, the product of the demand growth rate and the current maximum demand is taken as the charging power of the energy storage power station.

[0089] After calculating the charging power of the energy storage power station, in the charging period, the energy storage power station is controlled to perform charging operation according to the charging power. When the charging period ends, the charging operation is stopped.

[0090] S13, determining the real-time maximum demand at the end of the waiting period.

[0091] Specifically, after the charging period ends, a waiting period is entered, in which the energy storage power station does not perform charging and discharging operations, and only the target load generates the demand at this time. At the end of the waiting period, the real-time maximum demand Pcurr of the target load is obtained. The real-time maximum demand can be the maximum demand of the target load in the current demand calculation period, or can be the maximum demand of the target load in the electricity cost calculation period.

[0092] S14, in the case where the real-time maximum demand is less than the sum of the current maximum demand and the charging power, controlling the energy storage power station to perform discharging operation according to the charging power in the discharging period.

[0093] Wherein, the sum of the current maximum demand and the charging power is Pt+Pchu.

[0094] If PcurrPt+Pchu, it indicates that the energy storage charging in the charging period increases the user demand data, and in the next discharging period, the energy storage system discharges according to Pchu, and the demand index increased before is reduced again.

[0095] In another implementation manner of the present application, in the case where the real-time maximum demand is not less than the sum of the current maximum demand and the charging power, the method further comprises:

[0096] Updating the current maximum demand as the real-time maximum demand.

[0097] That is to say, in the case where PcurrPt+Pchu, it indicates that the energy storage charging in the charging period does not have any influence on the user demand, at this time, the current maximum demand is updated as the real-time maximum demand, and the discharging control operation is not required, and waiting until the next demand calculation period starts, and step S11 is executed again.

[0098] It should be noted that in the present embodiment, since the energy storage charging can increase the maximum demand and the energy storage discharging can reduce the maximum demand, the application scenario in the present embodiment is the energy storage charging scenario.

[0099] In the embodiment, at the beginning of a demand calculation period after the energy storage power station is configured, the current maximum demand is obtained, in a case where it is determined that a demand trend of a target load of a previous demand calculation period meets a preset trend, a charging power of the energy storage power station is calculated, and in the charging period, the energy storage power station is controlled to perform a charging operation according to the charging power; a real-time maximum demand at the end of the waiting period is determined, and in a case where the real-time maximum demand is less than a sum of the current maximum demand and the charging power, it is indicated that the charging operation of the energy storage power station causes the maximum demand to increase, and at this time, the energy storage power station is controlled to perform a discharging operation according to the charging power in the discharging period, so as to offset a part of the maximum demand increase caused by the charging operation of the energy storage power station, and ensure that the charging operation of the energy storage power station does not cause the maximum demand to increase.

[0100] In addition, the application solves the problem that in the first day of operation of the energy storage system, when the demand target is unknown, the energy storage charging and discharging are controlled through iteration of different periods in a demand calculation period, so as to ensure that the maximum demand of the user is not affected after the energy storage is configured.

[0101] In addition, the application can reduce the generation of demand electricity charges with a high probability, and help the user to reduce the demand electricity charges.

[0102] Optionally, on the basis of the embodiment of the energy storage control method, another embodiment of the application provides an energy storage control device applied to an energy storage controller, wherein the energy storage controller is configured with a demand calculation period, the demand calculation period includes a charging period, a waiting period and a discharging period arranged in time sequence; the time length of the discharging period is the same as that of the charging period; the energy storage control device includes Figure 4 , the energy storage control device includes

[0103] The demand obtaining module 11 is configured to obtain the current maximum demand at the beginning of a demand calculation period after the energy storage power station is configured.

[0104] The charging control module 12 is configured to, in a case where it is determined that a demand trend of a target load of a previous demand calculation period meets a preset trend, calculate a charging power of the energy storage power station, and control the energy storage power station to perform a charging operation according to the charging power in the charging period.

[0105] The demand determining module 13 is configured to determine a real-time maximum demand at the end of the waiting period.

[0106] The discharging control module 14 is configured to, in a case where the real-time maximum demand is less than a sum of the current maximum demand and the charging power, control the energy storage power station to perform a discharging operation according to the charging power in the discharging period.

[0107] Further, the charging control module 12 is configured to determine that the demand trend of the target load in the last demand calculation period meets the preset trend, and specifically configured to:

[0108] respectively acquire the demand values of the target load in the charging period, the waiting period and the discharging period of the last demand calculation period, and determine whether the demand values of the charging period, the waiting period and the discharging period are in an increasing trend in chronological order, and if so, determine that the demand trend of the target load in the last demand calculation period meets the preset trend. The target load is all the loads in the target site except the energy storage power station.

[0109] Further, the charging control module 12 comprises:

[0110] a judgment submodule configured to determine whether the current time is within a preset time period;

[0111] a proportion determination submodule configured to, if so, determine the demand growth proportion of the last demand calculation period;

[0112] a power calculation submodule configured to calculate the charging power of the energy storage power station based on the demand growth proportion and the current maximum demand.

[0113] Further, the judgment submodule is specifically configured to:

[0114] acquire the current time and determine whether the current time is located in a valley time period or a flat time period.

[0115] Further, the proportion determination submodule is specifically configured to:

[0116] calculate the demand growth proportions of adjacent periods in the charging period, the waiting period and the discharging period of the last demand calculation period, and take the average value of the demand growth proportions as the demand growth proportion of the last demand calculation period.

[0117] Further, the power calculation submodule is specifically configured to:

[0118] take the product of the demand growth proportion and the current maximum demand as the charging power of the energy storage power station.

[0119] Further, the charging control module 12 further comprises:

[0120] a charging and discharging control module configured to control the charging and discharging power of the energy storage power station to be a preset power in the first demand calculation period after the energy storage power station is configured.

[0121] Further, the charging control module 12 further comprises:

[0122] an updating module configured to update the current maximum demand to be the real-time maximum demand in a case that the real-time maximum demand is not less than the sum of the current maximum demand and the charging power.

[0123] In the embodiment, at the beginning of a demand calculation period after the energy storage power station is configured, the current maximum demand is obtained, in a case where it is determined that the demand trend of the target load of the previous demand calculation period meets a preset trend, the charging power of the energy storage power station is calculated, and in the charging period, the energy storage power station is controlled to perform a charging operation according to the charging power, the real-time maximum demand at the end of the waiting period is determined, and in a case where the real-time maximum demand is less than the sum of the current maximum demand and the charging power, it is indicated that the charging operation of the energy storage power station causes the maximum demand to increase, and at this time, the energy storage power station is controlled to perform a discharging operation according to the charging power in the discharging period, so as to offset the part of the maximum demand increase caused by the charging operation of the energy storage power station, and ensure that the charging operation of the energy storage power station does not cause the maximum demand to increase.

[0124] In addition, the present application solves the problem that when the demand target is unknown in the first day of operation of the energy storage system, the energy storage charging and discharging are controlled through iteration of different periods in a demand calculation period, so as to ensure that the maximum demand of the user is not affected after the energy storage is configured.

[0125] In addition, the present application can reduce the demand electricity fee with a high probability, and help the user to reduce the demand electricity fee.

[0126] It should be noted that the working processes of the modules and sub-modules in the embodiment are described above, and will not be described here.

[0127] Optionally, on the basis of the above-mentioned embodiments of the energy storage control method and device, another embodiment of the present application provides an energy storage controller, comprising a memory and a processor.

[0128] The memory is used to store a program.

[0129] The processor calls the program and is used to execute the above-mentioned energy storage control method.

[0130] Optionally, on the basis of the above-mentioned embodiments of the energy storage controller, another embodiment of the present application provides an energy storage power station comprising the above-mentioned energy storage controller.

[0131] In the embodiment, at the beginning of a demand calculation period after the energy storage power station is configured, the current maximum demand is obtained, in a case where it is determined that the demand trend of the target load of the previous demand calculation period meets a preset trend, the charging power of the energy storage power station is calculated, and in the charging period, the energy storage power station is controlled to perform a charging operation according to the charging power, the real-time maximum demand at the end of the waiting period is determined, and in a case where the real-time maximum demand is less than the sum of the current maximum demand and the charging power, it is indicated that the charging operation of the energy storage power station causes the maximum demand to increase, at this time, the energy storage power station is controlled to perform a discharging operation according to the charging power in the discharging period, so as to offset the part of the maximum demand increase caused by the charging operation of the energy storage power station, and it is ensured that the charging operation of the energy storage power station does not cause the maximum demand to increase.

[0132] In addition, the present application solves the problem that when the demand target is unknown in the first day of operation of the energy storage system, the charging and discharging of the energy storage are controlled through iteration of different periods in a demand calculation period, so as to ensure that the maximum demand of the user is not affected after the energy storage is configured.

[0133] In addition, the present application can reduce the demand electricity fee with a high probability, and help the user to reduce the demand electricity fee.

[0134] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage control method, characterized in that, This is applied to an energy storage controller, which is configured with a demand calculation cycle, the demand calculation cycle including a charging period, a waiting period and a discharging period arranged in chronological order; the discharging period has the same duration as the charging period. The energy storage control method includes: At the start of a demand calculation cycle after configuring the energy storage power station, the current maximum demand is obtained; wherein, during the first demand calculation cycle after configuring the energy storage power station, the charging and discharging power of the energy storage power station is controlled to a preset power. If the demand trend of the target load in the previous demand calculation period meets the preset trend, the charging power of the energy storage station is calculated, and during the charging period, the energy storage station is controlled to perform charging operation according to the charging power; wherein, the demand trend meeting the preset trend includes: the demand values ​​of the charging period, waiting period and discharging period are increasing in chronological order. Determine the real-time maximum demand at the end of the waiting period; If the real-time maximum demand is less than the sum of the current maximum demand and the charging power, the energy storage power station is controlled to discharge at the charging power during the discharge period.

2. The energy storage control method according to claim 1, characterized in that, Determining that the demand trend of the target load in the previous demand calculation period meets the preset trend includes: The demand values ​​of the target load during the charging period, waiting period, and discharging period of the previous demand calculation cycle are obtained respectively; the target load refers to all other loads in the target site except for the energy storage power station. Determine whether the demand values ​​of the charging period, the waiting period, and the discharging period increase in chronological order. If so, then it is determined that the demand trend of the target load in the previous demand calculation period meets the preset trend.

3. The energy storage control method according to claim 2, characterized in that, Calculating the charging power of an energy storage power station includes: Determine whether the current time is within a preset time period; If so, then determine the demand growth rate of the previous demand calculation period; The charging power of the energy storage power station is calculated based on the demand growth rate and the current maximum demand.

4. The energy storage control method according to claim 3, characterized in that, Determining whether the current time is within a preset time period includes: Obtain the current time and determine whether the current time is within a valley period or a normal period.

5. The energy storage control method according to claim 3, characterized in that, Determining the demand growth rate for the previous demand calculation period includes: Calculate the demand growth rate of adjacent periods in the charging period, waiting period and discharging period of the previous demand calculation cycle; The average value of the demand growth rate is used as the demand growth rate for the previous demand calculation period.

6. The energy storage control method according to claim 3, characterized in that, Based on the demand growth rate and the current maximum demand, the charging power of the energy storage power station is calculated, including: The product of the demand growth rate and the current maximum demand is used as the charging power of the energy storage power station.

7. The energy storage control method according to claim 1, characterized in that, In the case where the demand calculation cycle is the second or subsequent demand calculation cycle after the energy storage power station is configured, before obtaining the current maximum demand at the start of a demand calculation cycle after the energy storage power station is configured, the method further includes: During the first demand calculation cycle after configuring the energy storage power station, the charging and discharging power of the energy storage power station is controlled to a preset power.

8. The energy storage control method according to claim 1, characterized in that, If the real-time maximum demand is not less than the sum of the current maximum demand and the charging power, the method further includes: Update the current maximum demand to the real-time maximum demand.

9. An energy storage control device, characterized in that, The energy storage controller is applied to an energy storage controller, wherein the energy storage control device employs the energy storage control method as described in any one of claims 1-8, and the energy storage controller is configured with a demand calculation cycle, wherein the demand calculation cycle includes a charging period, a waiting period, and a discharging period arranged in chronological order; the discharging period has the same duration as the charging period. The energy storage control device includes: The demand acquisition module is used to acquire the current maximum demand at the start of a demand calculation cycle after the energy storage power station is configured; The charging control module is used to calculate the charging power of the energy storage station when it is determined that the demand trend of the target load in the previous demand calculation cycle meets the preset trend, and to control the energy storage station to perform charging operation according to the charging power during the charging period. The demand determination module is used to determine the real-time maximum demand at the end of the waiting period; The discharge control module is used to control the energy storage power station to perform discharge operation according to the charging power during the discharge period when the real-time maximum demand is less than the sum of the current maximum demand and the charging power.

10. An energy storage controller, characterized in that, include: Memory and processor; The memory is used to store programs; The processor calls the program and is used to execute the energy storage control method as described in any one of claims 1-8.

11. An energy storage power station, characterized in that, Includes the energy storage controller as described in claim 10.

Images