A control method for energy storage system, energy storage system and storage medium

Abstract

The present application discloses a control method for an energy storage system, an energy storage system and a storage medium. The energy storage system includes a battery unit and a control unit. The battery unit is connected to a transformer through a metering unit. The control unit connects the metering unit and the battery unit. The method is applied to the control unit. The method includes: obtaining active power and allowed total charge and discharge power; determining theoretical charge and discharge power and battery required charge and discharge power according to active power; determining a first adjusted charge and discharge power according to theoretical charge and discharge power and allowed total charge and discharge power, and determining a second adjusted charge and discharge power according to allowed total charge and discharge power and battery required charge and discharge power; determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power. Through the above method, the energy storage system can accurately, efficiently, safely and reliably perform demand control.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a control method for an energy storage system, an energy storage system and a storage medium. Background Art

[0002] At present, my country adopts a two-part electricity price for large industrial electricity users with a receiving transformer capacity of 315 kVA or above. Under the two-part electricity price, the electricity fee is divided into a kilowatt-hour electricity fee and a basic electricity fee. The kilowatt-hour electricity fee can be charged by multiplying the user's practical electricity by the unit price, or combined with peak fluctuations, valley fluctuations and power factors, etc. The basic electricity fee can be charged according to the user's receiving transformer capacity or maximum demand, which can be selected by the user.

[0003] It can be seen that whether the maximum demand can be accurately determined is related to the total value of the user's electricity bill. Once the demand is not controlled or the demand is determined inaccurately, the user's electricity consumption from the power grid will be uncontrollable, further causing the user's electricity bill to exceed expectations, and in serious cases, it may cause damage to the transformer.

[0004] Therefore, how to accurately control demand based on energy storage systems has become an urgent problem to be solved. Summary of the invention

[0005] To solve the above problems, the present application discloses a control method of an energy storage system, an energy storage system and a storage medium, which can enable the energy storage system to perform demand control accurately, efficiently, safely and reliably.

[0006] The first technical solution adopted in this application is: to provide a control method for an energy storage system. The energy storage system includes a battery unit and a control unit, the battery unit is connected to a transformer through a metering unit, the control unit connects the metering unit and the battery unit, the method is applied to the control unit, and the method includes: obtaining active power and allowed total charge and discharge power; determining theoretical charge and discharge power and battery required charge and discharge power according to active power; determining a first adjusted charge and discharge power according to the theoretical charge and discharge power and allowed total charge and discharge power, and determining a second adjusted charge and discharge power according to allowed total charge and discharge power and battery required charge and discharge power; determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power.

[0007] The metering unit includes a gateway table, the battery unit includes a plurality of cluster batteries and a corresponding plurality of cluster inverters, and obtaining the active power and the allowed total charge and discharge power includes: obtaining the active power from the gateway table; and obtaining the allowed charge and discharge power of the cluster battery and the allowed charge and discharge power of the cluster inverter, and determining the allowed total charge and discharge power according to the allowed charge and discharge power of the cluster battery and the allowed charge and discharge power of the cluster inverter.

[0008] The allowed total charge and discharge power is determined according to the allowed charge and discharge power of the cluster battery and the allowed charge and discharge power of the cluster inverter, including: determining the smaller value of the allowed charge and discharge power of the cluster battery and the allowed charge and discharge power of the cluster inverter as the allowed total charge and discharge power.

[0009] Among them, determining the theoretical charge and discharge power and the battery demand charge and discharge power according to the active power includes: obtaining the maximum power demand and the actual charge and discharge power; when the active power is greater than the maximum power demand, determining the theoretical charge and discharge power according to the actual charge and discharge power, the active power and the maximum power demand.

[0010] The actual charge and discharge power, active power and maximum power demand determine the theoretical charge and discharge power, including: using the following formula to calculate the theoretical charge and discharge power: P1'=P1+P-P0; wherein P1' is the theoretical charge and discharge power, P1 is the actual charge and discharge power, P is the active power, and P0 is the maximum power demand.

[0011] Among them, determining the theoretical charging and discharging power and the battery required charging and discharging power according to the active power includes: obtaining the effective charging and discharging time and the actual charging and discharging power; determining the effective time average power according to the active power and the effective charging and discharging time; determining the transformer remaining time average power according to the effective time average power; determining the battery required charging and discharging power according to the actual charging and discharging power, the active power and the transformer remaining time average power.

[0012] The remaining time average power of the transformer is determined according to the effective time average power, including: using the following formula to calculate the remaining time average power of the transformer: Among them, P4 is the average power of the transformer remaining time, P0 is the maximum power demand, t0 is the demand time, P3 is the average power of the effective time, and t is the effective charging and discharging time.

[0013] When charging, the required charging and discharging power of the battery is determined according to the actual charging and discharging power, active power and the average power of the transformer remaining time, including: using the following formula to calculate the required charging power of the battery: When discharging, the required charging and discharging power of the battery is determined according to the actual charging and discharging power, the active power and the remaining time average power of the transformer, including: using the following formula to calculate the required discharging power of the battery: in, Charging power for battery demand, is the required discharge power of the battery, P4 is the average power of the transformer during the remaining time, and P is the active power.

[0014] Among them, the first adjusted charge and discharge power is determined according to the theoretical charge and discharge power and the allowed total charge and discharge power, including: when the theoretical charge and discharge power is greater than or equal to the allowed total charge and discharge power, determining the allowed total charge and discharge power as the first adjusted charge and discharge power; or when the theoretical charge and discharge power is less than the allowed total charge and discharge power, determining the theoretical charge and discharge power as the first adjusted charge and discharge power.

[0015] Among them, the second adjusted charge and discharge power is determined according to the allowed total charge and discharge power and the battery required charge and discharge power, including: when the battery required charge and discharge power is greater than or equal to the allowed total charge and discharge power, determining the allowed total charge and discharge power as the second adjusted charge and discharge power; when the battery required charge and discharge power is less than the allowed total charge and discharge power, determining the battery required charge and discharge power as the second adjusted charge and discharge power.

[0016] Among them, during charging, the final charge and discharge power is determined according to the first adjusted charge and discharge power and the second adjusted charge and discharge power, including: when the first adjusted charging power is greater than or equal to the second adjusted charging power, the second adjusted charging power is determined as the final charging power; when the first adjusted charging power is less than the second adjusted charging power, the first adjusted charging power is determined as the final charging power; during discharging, the final charge and discharge power is determined according to the first adjusted charge and discharge power and the second adjusted charge and discharge power, including: when the first adjusted discharge power is greater than or equal to the second adjusted discharge power, the first adjusted discharge power is determined as the final discharge power; when the first adjusted discharge power is less than the second adjusted discharge power, the second adjusted discharge power is determined as the final discharge power.

[0017] The method further includes: determining that the current time is a charging time or a discharging time; wherein the charging time and the discharging time are pre-divided based on the electricity price range; when the current time is the charging time, controlling the battery unit to charge; or when the current time is the discharging time, controlling the battery unit to discharge.

[0018] Among them, the method also includes: determining the current charge and discharge mode; in the first charge and discharge mode, using a preset charge and discharge power for charging and discharging; in the second charge and discharge mode, executing the steps of obtaining active power, and determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power, so as to charge and discharge according to the final charge and discharge power.

[0019] The second technical solution adopted in the present application is to provide an energy storage system, which includes: a battery unit connected to a transformer through a metering unit; a control unit connected to the metering unit and the battery unit, and the control unit is configured to execute a control method for implementing the above-mentioned energy storage system.

[0020] The third technical solution adopted in the present application is: to provide a computer-readable storage medium, in which program data is stored, and the program data implements the above-mentioned control method of the energy storage system when executed by the processor.

[0021] The present application provides a control method for an energy storage system, an energy storage system and a storage medium. The energy storage system includes a battery unit and a control unit, wherein the battery unit is connected to a transformer through a metering unit, and the control unit is connected to the metering unit and the battery unit. The method is applied to the control unit, and the control method includes: obtaining active power and allowed total charge and discharge power; determining theoretical charge and discharge power and battery required charge and discharge power according to active power; determining a first adjusted charge and discharge power according to theoretical charge and discharge power and allowed total charge and discharge power, and determining a second adjusted charge and discharge power according to allowed total charge and discharge power and battery required charge and discharge power; determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power. In the above manner, the control unit in the energy storage system can detect the information and demand of each cluster battery in real time, and then can accurately control the demand thereof, so as to save the user's electricity cost and save energy and protect the environment; in addition, due to the use of a distributed energy storage system, the DC sides of the cluster batteries are independent of each other, and the cluster batteries can be independently controlled to solve the circulation problem of mutual charging and discharging between cluster batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 It is a structural schematic diagram of an embodiment of an energy storage system provided by the present application;

[0024] Figure 2 It is a flow chart of an embodiment of a control method for an energy storage system provided by the present application;

[0025] Figure 3 is a flow chart of another embodiment of the control method of the energy storage system provided by the present application;

[0026] Figure 4 It is a flow chart of an embodiment of a control method of an energy storage system during charging provided by the present application;

[0027] Figure 5 It is a flow chart of an embodiment of a method for controlling an energy storage system during discharge provided by the present application;

[0028] Figure 6 It is a structural schematic diagram of an embodiment of a computer-readable storage medium provided by the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be appreciated that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present application.

[0030] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] See also Figure 1 , Figure 1 It is a structural diagram of an embodiment of an energy storage system provided in the present application. The energy storage system 100 is connected to a transformer 300 and a load 400 through a metering unit 200. Specifically, the energy storage system 100 includes a battery unit 10 and a control unit 20. The battery unit 10 is connected to the transformer 300 through the metering unit 200; the control unit 20 is connected to the metering unit 200 and the battery unit 10, and the control unit 20 is configured to execute the control method of the energy storage system described below.

[0033] Optionally, in one embodiment, the metering unit 200 includes a gateway table 201, and the battery unit 10 includes a plurality of cluster batteries 101 and a corresponding plurality of cluster inverters 102. The gateway table is a table for recording the total power consumption of the entire transformer power supply area.

[0034] Optionally, in one embodiment, the gateway table 201 provides an RS485 interface, a MODBUS RTU (Remote Terminal Unit) or a DL / T645 communication protocol.

[0035] It can be understood that, compared with the energy storage system in the prior art, the distributed energy storage system is adopted in this solution, so that the DC sides of the cluster batteries are independent of each other, so that the cluster batteries can be independently controlled to solve the circulation problem of mutual charging and discharging between cluster batteries; in addition, the cluster batteries in this energy storage system are multi-level independent, which can improve the electrical safety of the energy storage system. The AC contactor is used to divide the multi-branch at the junction box to solve the safety problem that multiple cluster batteries connected in parallel may cause the junction box to overheat and cause fire. The multi-branch branching and parallel connection reduce the energy flow of the junction, further reduce the bus specifications, and thus reduce the cost.

[0036] See also Figure 2 , Figure 2 1 is a flow chart of an embodiment of a control method for an energy storage system provided by the present application. The control method for an energy storage system is applied to a control unit 20. The control method specifically includes the following steps:

[0037] Step S11: Obtaining active power and allowed total charge and discharge power.

[0038] Optionally, in one embodiment, step S11 may specifically include:

[0039] Step S111: Obtain active power from the gateway table.

[0040] It can be understood that the real-time value P of the active power can be directly obtained from the gateway table.

[0041] Optionally, in one embodiment, before obtaining the active power and the allowed total charge and discharge power, the current charge and discharge mode needs to be determined, wherein the charge mode includes a first charge and discharge mode and a second charge and discharge mode. In the first charge and discharge mode, the preset charge and discharge power is used for charging and discharging, that is, the demand control function is not started. In the second charge and discharge mode, the demand control function needs to be started to charge and discharge according to the final charge and discharge power.

[0042] It can be understood that the charging time and discharging time can be pre-divided according to the electricity price range. When the electricity price range is the lowest on the day, it can be divided into the charging time; when the electricity price range is other than the lowest on the day, it can be divided into the discharging time, so as to determine that the current time is the charging time or the discharging time. Optionally, when the current time is the charging time, the battery unit 10 is controlled to charge, or when the current time is the discharging time, the battery unit 10 is controlled to charge.

[0043] Step S112: obtaining the allowed charging and discharging power of the cluster battery and the allowed charging and discharging power of the cluster inverter, and determining the allowed total charging and discharging power according to the allowed charging and discharging power of the cluster battery and the allowed charging and discharging power of the cluster inverter.

[0044] Optionally, the smaller value of the cluster battery allowed charge and discharge power A2 and the cluster inverter allowed charge and discharge power B2 is determined as the allowed charge and discharge total power P2'. Specifically, by comparing the cluster battery allowed charge and discharge power A2 and the cluster inverter allowed charge and discharge power B2, the smaller value of the cluster battery allowed charge and discharge power A2 and the cluster inverter allowed charge and discharge power B2 is determined as the cluster allowed charge and discharge power P2, and then multiple cluster allowed charge and discharge powers P2 are added to obtain the allowed charge and discharge total power P2', that is, the allowed charge and discharge total power is calculated using the following formula:

[0045] P2'=∑P2.

[0046] Optionally, in one embodiment, the cluster battery allowed charge and discharge power A2 is acquired in the control unit 20 , and the cluster inverter allowed charge and discharge power B2 is acquired in the cluster inverter 102 .

[0047] Step S12: Determine the theoretical charging and discharging power and the battery required charging and discharging power according to the active power.

[0048] Optionally, in one embodiment, step S12 may specifically include:

[0049] Step S121: obtaining the maximum power demand and the actual charge and discharge power; when the active power is greater than the maximum power demand, determining the theoretical charge and discharge power according to the actual charge and discharge power, the active power and the maximum power demand.

[0050] Optionally, during discharge, the active power P is greater than the maximum power demand P0, and the theoretical charge and discharge power is determined according to the actual charge and discharge power P1, the active power P and the maximum power demand P0.

[0051] Optionally, when charging, the active power P is less than the maximum power demand P0, and the theoretical charge and discharge power P1' is determined according to the actual charge and discharge power P1, the active power P and the maximum power demand P0. The following formula is used to calculate the theoretical charge and discharge power during charging and discharging:

[0052] P1' = P1 + P - P0;

[0053] Among them, P1' is the theoretical charge and discharge power, P1 is the actual charge and discharge power, P is the active power, and P0 is the maximum power demand. It should be noted that the actual charge and discharge power P1 is 0 in the initial state.

[0054] Step S122: Obtain effective charge and discharge time and actual charge and discharge power; determine effective time average power according to active power and effective charge and discharge time; determine transformer remaining time average power according to effective time average power; determine battery required charge and discharge power according to actual charge and discharge power, active power and transformer remaining time average power.

[0055] Specifically, the effective time average power can be calculated according to the active power P and the effective charge and discharge time t using the following formula:

[0056]

[0057] Among them, P3 is the effective time average power, t is the effective charge and discharge time, and P is the active power. It should be noted that the effective charge and discharge time t is the current time starting from 0.

[0058] Furthermore, the transformer remaining time average power P4 is determined according to the effective time average power P3, and the transformer remaining time average power can be calculated using the following formula:

[0059]

[0060] Among them, P4 is the average power of the remaining time of the power grid, P0 is the maximum power demand, is the demand time, P3 is the average power of the effective time, and t is the effective charging and discharging time. It should be noted that the demand time t0 defaults to 15 minutes.

[0061] It can be understood that the effective time average power P3 and the transformer remaining time average power P4 are both the power of the transformer.

[0062] Optionally, when charging, the battery required charging power is determined based on the actual charging and discharging power P1, the active power P and the transformer remaining time average power P4. The required battery charging power can be calculated using the following formula:

[0063]

[0064] Optionally, when discharging, the battery required discharge power is determined based on the actual charge and discharge power P1, active power P and the transformer remaining time average power P4. The required battery discharge power can be calculated using the following formula:

[0065]

[0066] in, Charging power for battery demand, is the required discharge power of the battery, P4 is the average power of the remaining time of the power grid, P is the active power, and P1 is the actual charging and discharging power.

[0067] It can be understood that step S121 and step S122 can be performed simultaneously to simultaneously obtain the theoretical charging and discharging power P1 and the battery required charging power and battery discharge power required

[0068] Step S13: determining a first adjusted charge and discharge power according to the theoretical charge and discharge power and the allowed total charge and discharge power, and determining a second adjusted charge and discharge power according to the allowed total charge and discharge power and the battery required charge and discharge power.

[0069] Optionally, in one embodiment, step S13 may specifically include:

[0070] Step S131: when the theoretical charge and discharge power is greater than or equal to the allowed total charge and discharge power, the allowed total charge and discharge power is determined to be the first adjusted charge and discharge power; or when the theoretical charge and discharge power is less than the allowed total charge and discharge power, the theoretical charge and discharge power is determined to be the first adjusted charge and discharge power.

[0071] Step S132: when the battery required charge and discharge power is greater than or equal to the allowed total charge and discharge power, the allowed total charge and discharge power is determined to be the second adjusted charge and discharge power; when the battery required charge and discharge power is less than the allowed total charge and discharge power, the battery required charge and discharge power is determined to be the second adjusted charge and discharge power.

[0072] Optionally, step S131 and step S132 may be performed simultaneously to obtain the first adjusted charge and discharge power P1″ and the second adjusted charge and discharge power P1″′ simultaneously.

[0073] Step S14: determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power.

[0074] Optionally, in one embodiment, during charging, when the first charging power P" is adjusted A1 Greater than or equal to the second adjusted charging power P"' A1 When the second adjustment charging power P"' is determined A1 Final charging power When the first adjustment charging power P" A1 Less than the second adjusted charging power P"' A1 When the first adjustment charging power P" is determined A1 Final charging power

[0075] During discharge, when the first adjustment discharge power P" B1 Greater than or equal to the second adjusted discharge power P"' B1 When the first adjustment discharge power P" is determined B1 The final discharge power When the first adjustment discharge power P" B1 Less than the second adjusted discharge power P"' B1 When the second adjustment discharge power P"' is determined B1 The final discharge power

[0076] It can be understood that the first adjusted charging and discharging power P1" can be divided into the first adjusted charging power P" A1 and the first adjustment discharge power P" B1 The second adjustment charge and discharge power P1" can be divided into the second adjustment charging power P"' A1 and the second adjustment discharge power P"' B1 .

[0077] It can be understood that compared with the demand control method of the energy storage system in the prior art, this control method can accurately control the power consumption of the user side from the power grid and protect the transformer from damage; in addition, this control method can stabilize the power output of the energy storage system.

[0078] Different from the prior art, the present application provides a control method for an energy storage system. The energy storage system includes a battery unit and a control unit. The battery unit is connected to a transformer through a metering unit. The control unit connects the metering unit and the battery unit. The control method of the energy storage system is applied to the control unit. The method includes: obtaining active power and allowed total charge and discharge power; determining theoretical charge and discharge power and battery required charge and discharge power according to active power; determining a first adjusted charge and discharge power according to theoretical charge and discharge power and allowed total charge and discharge power, and determining a second adjusted charge and discharge power according to allowed total charge and discharge power and battery required charge and discharge power; determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power. Through the above-mentioned method, the control unit in the energy storage system can detect the information and demand of each cluster battery in real time, and then can accurately control the demand thereof, so as to save the user's electricity cost and save energy and protect the environment; in addition, due to the use of a distributed energy storage system, the DC sides of the cluster batteries are independent of each other, and the cluster batteries can be independently controlled to solve the circulation problem of mutual charging and discharging between cluster batteries.

[0079] See also Figure 3 , Figure 3 2 is a flow chart of another embodiment of the control method of the energy storage system provided by the present application. The control method of the energy storage system is applied to the control unit 20, and the specific steps of the control method are as follows:

[0080] Step S31: Determine whether the current time is charging time or discharging time.

[0081] Optionally, in one embodiment, the electricity price interval can be pre-divided. When the electricity price interval is the lowest on the day, it can be divided into charging time; when the electricity price interval is other than the lowest on the day, it can be divided into discharging time. Optionally, the battery unit 10 can be controlled to charge when the current time is the charging time, or the battery unit 10 can be controlled to charge when the current time is the discharging time.

[0082] Step S32: Determine the current charge and discharge mode.

[0083] Optionally, in one embodiment, the current charge and discharge mode is determined, such as in the first charge and discharge mode, the preset charge and discharge power is used for charging and discharging, that is, the demand control function does not need to be started. In the second charge and discharge mode, the demand control function is started.

[0084] Step S33: Obtaining active power and allowed total charge and discharge power.

[0085] Optionally, in one embodiment, step S33 may specifically include:

[0086] Step S331: Obtain active power from the gateway table.

[0087] It can be understood that the real-time value P of the active power can be obtained from the gateway table.

[0088] Step S332: obtaining the allowed charging and discharging power of the cluster battery and the allowed charging and discharging power of the cluster inverter, and determining the allowed total charging and discharging power according to the allowed charging and discharging power of the cluster battery and the allowed charging and discharging power of the cluster inverter.

[0089] Optionally, the smaller value of the cluster battery allowed charge and discharge power A2 and the cluster inverter allowed charge and discharge power B2 is determined as the allowed charge and discharge total power P2'. Specifically, by comparing the cluster battery allowed charge and discharge power A2 and the cluster inverter allowed charge and discharge power B2, the smaller value of the cluster battery allowed charge and discharge power A2 and the cluster inverter allowed charge and discharge power B2 is determined as the cluster allowed charge and discharge power P2, and then multiple cluster allowed charge and discharge powers P2 are added to obtain the allowed charge and discharge total power P2', that is, the allowed charge and discharge total power is calculated using the following formula:

[0090] P2'=∑P2.

[0091] Optionally, the cluster battery allowed charge and discharge power A2 is acquired in the control unit 20 ; and the cluster inverter allowed charge and discharge power B2 is acquired in the cluster inverter 102 .

[0092] Step S34: Determine the theoretical charging and discharging power and the battery required charging and discharging power according to the active power.

[0093] Optionally, in one embodiment, step S34 may specifically include:

[0094] Step S341: obtaining the maximum power demand and the actual charge and discharge power; when the active power is greater than the maximum power demand, determining the theoretical charge and discharge power according to the actual charge and discharge power, the active power and the maximum power demand.

[0095] Optionally, during discharge, the active power P is greater than the maximum power demand P0, and the theoretical charge and discharge power is determined according to the actual charge and discharge power P1, the active power P and the maximum power demand P0.

[0096] Optionally, when charging, the active power P is less than the maximum power demand P0, and the theoretical charge and discharge power P1' is determined according to the actual charge and discharge power P1, the active power P and the maximum power demand P0. The following formula is used to calculate the theoretical charge and discharge power during charging and discharging:

[0097] P1' = P1 + P - P0;

[0098] Among them, P1' is the theoretical charge and discharge power, P1 is the actual charge and discharge power, P is the active power, and P0 is the maximum power demand. It should be noted that the actual charge and discharge power P1 is 0 in the initial state.

[0099] Step S342: Obtain effective charge and discharge time and actual charge and discharge power; determine effective time average power according to active power and effective charge and discharge time; determine transformer remaining time average power according to effective time average power; determine battery required charge and discharge power according to actual charge and discharge power, active power and transformer remaining time average power.

[0100] Specifically, the effective time average power can be calculated according to the active power P and the effective charge and discharge time t using the following formula:

[0101]

[0102] Furthermore, the transformer remaining time average power P4 is determined according to the effective time average power P3, and the transformer remaining time average power can be calculated using the following formula:

[0103]

[0104] Among them, P4 is the average power of the remaining time of the power grid, P0 is the maximum power demand, is the demand time, P3 is the average power of the effective time, and t is the effective charging and discharging time. It should be noted that the demand time t0 defaults to 15 minutes.

[0105] Optionally, when charging, the battery required charging power is determined based on the actual charging and discharging power P1, the active power P and the transformer remaining time average power P4. The required battery charging power can be calculated using the following formula:

[0106]

[0107] Optionally, when discharging, the battery required discharge power is determined based on the actual charge and discharge power P1, active power P and the transformer remaining time average power P4. The required battery discharge power can be calculated using the following formula:

[0108]

[0109] in, Charging power for battery demand, is the required discharge power of the battery, P4 is the average power of the remaining time of the power grid, P is the active power, and P1 is the actual charging and discharging power.

[0110] It can be understood that step S341 and step S342 can be performed simultaneously to simultaneously obtain the theoretical charging and discharging power P1 and the battery required charging power and battery discharge power required

[0111] Step S35: determining a first adjusted charge and discharge power according to the theoretical charge and discharge power and the allowed total charge and discharge power, and determining a second adjusted charge and discharge power according to the allowed total charge and discharge power and the battery required charge and discharge power.

[0112] Optionally, in one embodiment, step S35 may specifically include:

[0113] Step S351: when the theoretical charge and discharge power is greater than or equal to the allowed total charge and discharge power, the allowed total charge and discharge power is determined to be the first adjusted charge and discharge power; or when the theoretical charge and discharge power is less than the allowed total charge and discharge power, the theoretical charge and discharge power is determined to be the first adjusted charge and discharge power.

[0114] Step S352: When the battery required charge and discharge power is greater than or equal to the allowed total charge and discharge power, the allowed total charge and discharge power is determined to be the second adjusted charge and discharge power; when the battery required charge and discharge power is less than the allowed total charge and discharge power, the battery required charge and discharge power is determined to be the second adjusted charge and discharge power.

[0115] Step S36: determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power.

[0116] Optionally, in one embodiment, during charging, when the first charging power P" is adjusted A1 Greater than or equal to the second adjusted charging power P"' A1 When the second adjustment charging power P"' is determined A1 Final charging power When the first charging power P is adjusted A1 Less than the second adjusted charging power P"' A1 When the first adjustment charging power P" is determined A1 Final charging power

[0117] During discharge, when the first adjustment discharge power P" B1 Greater than or equal to the second adjusted discharge power P"' B1 When the first adjustment discharge power P" is determined B1 The final discharge power When the first adjustment discharge power P" B1 Less than the second adjusted discharge power P"' B1 When the second adjustment discharge power P"' is determined B1 The final discharge power

[0118] It can be understood that the first adjusted charging and discharging power P1" can be divided into the first adjusted charging power P" A1 and the first adjustment discharge power P" B1 The second adjustment charge and discharge power P1" can be divided into the second adjustment charging power P"' A1 and the second adjustment discharge power P"' B1 .

[0119] See also Figure 4 and Figure 5 , Figure 4 It is a flow chart of an embodiment of a control method of an energy storage system during charging provided by the present application; Figure 5 It is a flow chart of an embodiment of a method for controlling an energy storage system during discharge provided in the present application.

[0120] When charging or discharging, obtain active power, allowed total charging power, and allowed total discharging power. Further, determine theoretical charging power, theoretical discharging power, battery required charging power, and battery required discharging power based on active power. Further, determine a first adjusted charging power based on the theoretical charging power and allowed total charging power, and determine a second adjusted charging power based on allowed total charging power and battery required charging power. Or determine a first adjusted discharge power based on theoretical discharge power and allowed total discharge power, and determine a second adjusted discharge power based on allowed total discharge power and battery required discharge power. Further, determine a final adjusted charging power based on the first adjusted charging power and the second adjusted charging power, and determine a final adjusted discharge power based on the first adjusted discharge power and the second adjusted discharge power. Determine the final adjusted charging power and the final adjusted discharge power with reference to the description of the above embodiments, which will not be repeated here.

[0121] See also Figure 6, Figure 6 1 is a schematic diagram of a structure of an embodiment of a computer-readable storage medium provided by the present application. The computer-readable storage medium 120 stores program data 130. When the program data 130 is executed by a processor, it is used to implement the following method:

[0122] Obtain active power and allowed total charge and discharge power; determine theoretical charge and discharge power and battery required charge and discharge power according to active power; determine a first adjusted charge and discharge power according to theoretical charge and discharge power and allowed total charge and discharge power, and determine a second adjusted charge and discharge power according to allowed total charge and discharge power and battery required charge and discharge power; determine a final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power.

[0123] Among them, the processor in the above embodiment can also be called CPU (Central Processing Unit). The processor may be an integrated circuit chip with signal processing capabilities. The processor can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, 15ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor can be implemented by multiple integrated circuit chips.

[0124] Among them, the memory or computer-readable storage medium in the above embodiments can be a medium that can store program data, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or it can also be a server that stores the program data. The server can send the stored program data to other devices for execution, or it can also execute the stored program data by itself.

[0125] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only illustrative, for example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0126] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0127] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0128] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for an energy storage system, characterized in that: The energy storage system comprises a battery unit and a control unit, wherein the battery unit is connected to a transformer via a metering unit, and the control unit is connected to the metering unit and the battery unit. The method is applied to the control unit, and the method comprises: Obtain active power and total allowed charging and discharging power; Determining theoretical charging and discharging power and battery required charging and discharging power according to the active power; Determine a first adjusted charge and discharge power according to the theoretical charge and discharge power and the allowed total charge and discharge power, and determine a second adjusted charge and discharge power according to the allowed total charge and discharge power and the battery required charge and discharge power; Determining a final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power; Wherein, determining the theoretical charging and discharging power and the battery required charging and discharging power according to the active power includes: Obtain the maximum power demand and actual charging and discharging power; When the active power is greater than the maximum power demand, the theoretical charge and discharge power is determined according to the following formula: P'1 = P1 + P - P0; Among them, P'1 is the theoretical charge and discharge power, P1 is the actual charge and discharge power, P is the active power, and P0 is the maximum power demand; Get effective charge and discharge time and actual charge and discharge power; Determine the effective time average power according to the active power and the effective charge and discharge time; Determine the remaining time average power of the transformer according to the following formula: Among them, P4 is the average power of the transformer remaining time, P0 is the maximum power demand, t0 is the demand time, P3 is the average power of the effective time, and t is the effective charging and discharging time; Determine the required charging and discharging power of the battery according to the actual charging and discharging power, the active power and the remaining time average power of the transformer; Wherein, determining the required charging and discharging power of the battery according to the actual charging and discharging power, the active power and the remaining time average power of the transformer includes: When charging, the battery's required charging power is determined according to the following formula: When discharging, the battery required discharge power is determined according to the following formula: in, Charging power for battery demand, is the required discharge power of the battery, P4 is the average power of the transformer during the remaining time, and P is the active power.

2. The control method of the energy storage system according to claim 1, characterized in that: The metering unit includes a gateway table, the battery unit includes a plurality of cluster batteries and a corresponding plurality of cluster inverters, and the acquisition of active power and allowed total charge and discharge power includes: Obtaining active power from the gateway table; and The allowed charging and discharging power of the cluster battery and the allowed charging and discharging power of the cluster inverter are acquired, and the allowed total charging and discharging power is determined according to the allowed charging and discharging power of the cluster battery and the allowed charging and discharging power of the cluster inverter.

3. The control method of the energy storage system according to claim 2, characterized in that: The step of determining the allowed total charge and discharge power according to the allowed charge and discharge power of the cluster battery and the allowed charge and discharge power of the cluster inverter includes: The smaller value between the allowed charge and discharge power of the cluster battery and the allowed charge and discharge power of the cluster inverter is determined as the allowed total charge and discharge power.

4. The control method of the energy storage system according to claim 1, characterized in that: The determining the first adjusted charge and discharge power according to the theoretical charge and discharge power and the allowed total charge and discharge power includes: When the theoretical charge and discharge power is greater than or equal to the allowed total charge and discharge power, determining the allowed total charge and discharge power as the first adjusted charge and discharge power; or When the theoretical charge and discharge power is less than the allowed total charge and discharge power, the theoretical charge and discharge power is determined to be the first adjusted charge and discharge power.

5. The control method of the energy storage system according to claim 1, characterized in that: The determining the second adjusted charge and discharge power according to the allowed total charge and discharge power and the battery required charge and discharge power includes: When the required charge and discharge power of the battery is greater than or equal to the allowed total charge and discharge power, determining the allowed total charge and discharge power as the second adjusted charge and discharge power; When the required charging and discharging power of the battery is less than the allowed total charging and discharging power, the required charging and discharging power of the battery is determined to be the second adjusted charging and discharging power.

6. The control method of the energy storage system according to claim 1, characterized in that: During charging, determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power includes: When the first adjusted charging power is greater than or equal to the second adjusted charging power, determining the second adjusted charging power as the final charging power; When the first adjusted charging power is less than the second adjusted charging power, determining the first adjusted charging power as the final charging power; During discharge, determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power includes: When the first adjusted discharge power is greater than or equal to the second adjusted discharge power, determining the first adjusted discharge power as the final discharge power; When the first adjusted discharge power is less than the second adjusted discharge power, the second adjusted discharge power is determined as the final discharge power.

7. The control method of the energy storage system according to claim 1, characterized in that: The method further comprises: Determine that the current time is a charging time or a discharging time; wherein the charging time and the discharging time are pre-divided based on an electricity price range; When the current time is the charging time, control the battery unit to charge; or When the current time is the discharge time, the battery unit is controlled to discharge.

8. The control method of the energy storage system according to claim 1, characterized in that: The method further comprises: Determine the current charging and discharging mode; In the first charge and discharge mode, charging and discharging are performed using a preset charge and discharge power; In the second charge and discharge mode, the steps of acquiring active power and determining the final charge and discharge power according to the first adjusted charge and discharge power and the second adjusted charge and discharge power are performed, so as to perform charging and discharging according to the final charge and discharge power.

9. An energy storage system, characterized in that: The energy storage system comprises: The battery unit is connected to the transformer through the metering unit; A control unit is connected to the metering unit and the battery unit, and the control unit is configured to execute the control method of the energy storage system according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the control method of the energy storage system according to any one of claims 1 to 8 is implemented.

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