Energy storage control method and system

Abstract

The invention provides an energy storage control method and system. The method comprises the following steps: determining a peak electricity period and a valley electricity period according to a local policy; when the cloud server determines that the time module T is in the valley electricity time and the SOC of the battery in the energy storage system is not full, the cloud server instructs the energy storage system to charge; and when the cloud server determines that the time module T is in the peak electricity time and the SOC of the battery in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge. The method can be used for peak load shifting and standby power, high electricity price in the peak load period and battery discharging, and low electricity price in the valley load period and battery charging.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage management, and in particular to an energy storage control method and system. Background Art

[0002] Energy management system (EMS) is a system used to monitor, control and optimize energy use. It helps enterprises effectively manage energy consumption, improve energy efficiency and reduce energy costs by collecting and analyzing energy data in real time.

[0003] The current EMS controls the operation mode of the energy storage system to monitor the power direction at the mains grid connection, the operating status of the energy storage system, and the load power. The energy storage equipment currently used is affected by the manufacturing process. As the charging and discharging cycles increase, it is difficult to ensure the consistency of the energy storage equipment. During charging and discharging, disordered charging and discharging will affect the energy storage effect. At the same time, it is difficult to ensure the normal operation of the microgrid and the life of the energy storage equipment.

[0004] At present, the electricity price of the city electricity is high during the peak load period and low during the low load period. How to adopt the peak load shaving and valley filling method to control the charging and discharging of EMS according to the peak and valley load is an urgent problem to be solved. Summary of the invention

[0005] The present application provides a method and system for energy storage control, which is used to support the setting of valley electricity prices and peak electricity prices, including summer and non-summer, to achieve peak shaving and valley filling, and can realize charging in valley electricity price or flat electricity price time period and discharging in peak electricity price time period, thereby saving energy, reducing electricity costs, and improving energy utilization.

[0006] In view of this, the first aspect of the present application provides an energy storage control method, which includes: determining peak power periods and valley power periods according to local policies; when the cloud server determines that the time module T is in valley power time and the remaining battery SOC in the energy storage system is not full, the cloud server instructs the energy storage system to charge; when the cloud server determines that the time module T is in peak power time and the battery SOC in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge.

[0007] Optionally, in a possible implementation, the cloud server instructs the energy storage system to charge specifically including: the cloud server sends a charging instruction to the local energy management system EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to realize the charging function; the cloud server instructs the energy storage system to discharge specifically including: the cloud server sends a discharge instruction to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to realize the discharge function.

[0008] Optionally, in a possible implementation, after the cloud server instructs the energy storage system to charge, the method further includes: when the cloud server determines that the battery SOC is full or the time module T is not in valley power time, the cloud server instructs the energy storage system to stop charging; after the cloud server instructs the energy storage system to discharge, the method further includes: when the cloud server determines that the battery SOC is empty or the time module T is not in peak power time, the cloud server instructs the energy storage system to stop discharging.

[0009] Optionally, in a possible implementation, the cloud server determines the declared demand PX of the transformer corresponding to the energy storage system, and the real-time power PS of the transformer; when the energy storage system is in a charging state, if the cloud server determines that PS>PX, the cloud server instructs the energy storage system to reduce power until PS=PX; if the cloud server determines that PS<PX, the cloud server instructs the energy storage system to increase power until PS=PX.

[0010] Optionally, in a possible implementation, the cloud server instructs the energy storage system to reduce power specifically including: the cloud server sends a power reduction instruction to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to achieve a power reduction function; the cloud server instructs the energy storage system to increase power specifically including: the cloud server sends a power increase instruction to the local EMS system through the MQTT protocol, and the EMS system forwards it to the energy storage system to achieve a power increase function.

[0011] A second aspect of the present application provides an energy storage control system, which includes: a cloud server and an energy storage system, wherein the cloud server is used to determine peak power periods and valley power periods according to local policies; the cloud server is used to instruct the energy storage system to charge when it is determined that the time module T is in valley power time and the remaining battery power SOC in the energy storage system is not full; the cloud server is also used to instruct the energy storage system to discharge when it is determined that the time module T is in peak power time and the battery SOC in the energy storage system is not empty.

[0012] Optionally, in a possible implementation, the energy storage control system also includes: an on-site energy management system EMS, and the cloud server is specifically used to: send charging instructions to the on-site energy management system EMS through the MQTT protocol, which is forwarded by the EMS to the energy storage system to realize the charging function; send discharging instructions to the on-site EMS through the MQTT protocol, which is forwarded by the EMS to the energy storage system to realize the discharging function.

[0013] Optionally, in a possible implementation, the cloud server is further used to: when it is determined that the battery SOC is full or the time module T is not in valley power time, instruct the energy storage system to stop charging; when it is determined that the battery SOC is empty or the time module T is not in peak power time, instruct the energy storage system to stop discharging.

[0014] Optionally, in a possible implementation, the cloud server is also used to: determine the declared demand PX of the transformer corresponding to the energy storage system, and the real-time power PS of the transformer; when the energy storage system is in a charging state, if the cloud server determines that PS>PX, the cloud server instructs the energy storage system to reduce power until PS=PX; if the cloud server determines that PS<PX, the cloud server instructs the energy storage system to increase power until PS=PX.

[0015] Optionally, in a possible implementation, the cloud server is specifically used to: send a power reduction instruction to the local EMS through the MQTT protocol, which is forwarded by the EMS to the energy storage system to achieve a power reduction function; send a power increase instruction to the local EMS system through the MQTT protocol, which is forwarded by the EMS system to the energy storage system to achieve a power increase function.

[0016] The present application provides a method and system for energy storage control, which includes: determining peak power periods and valley power periods according to local policies; when the cloud server determines that the time module T is in valley power time and the remaining battery SOC in the energy storage system is not full, the cloud server instructs the energy storage system to charge; when the cloud server determines that the time module T is in peak power time and the battery SOC in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge. This method can be used for peak load shaving and valley filling and power backup. During peak load periods, the electricity price is high and the battery is discharged. During low load periods, the electricity price is low and the battery is charged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a flow chart of an energy storage control method provided in an embodiment of the present application; Figure 2 A schematic diagram of a flow chart of an energy storage control method provided in an embodiment of the present application; Figure 3 A schematic diagram of a flow chart of an energy storage control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0019] The term "and / or" in this application can be a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0020] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] The current EMS controls the operation mode of the energy storage system to monitor the power direction at the mains grid connection, the operating status of the energy storage system, and the load power. The energy storage equipment currently used is affected by the manufacturing process. As the charging and discharging cycles increase, it is difficult to ensure the consistency of the energy storage equipment. During charging and discharging, disordered charging and discharging will affect the energy storage effect. At the same time, it is difficult to ensure the normal operation of the microgrid and the life of the energy storage equipment.

[0022] At present, the electricity price of the city electricity is high during the peak load period and low during the low load period. How to adopt the peak load shaving and valley filling method to control the charging and discharging of EMS according to the peak and valley load is an urgent problem to be solved.

[0023] Therefore, this application provides an energy storage control method for supporting the setting of valley electricity prices and peak electricity prices, including summer and non-summer, to achieve peak shaving and valley filling, and to achieve charging in valley electricity price or flat electricity price time periods and discharging in peak electricity price time periods, thereby saving energy, reducing electricity costs, and improving energy utilization.

[0024] For details, see Figure 1 , an energy storage control method provided in the present application includes: S11. Determine peak power hours and valley power hours according to local policies.

[0025] The peak and valley hours need to be determined according to local policies. For example, in some areas, the peak hours may be 8:00-18:00, and the valley hours may be 23:00-7:59. The specific needs need to be determined according to local policies. The cloud server can obtain local real-time policy information to determine the peak and valley hours.

[0026] S12: When the cloud server determines that the time module T is in valley power time and the remaining battery capacity SOC in the energy storage system is not full, the cloud server instructs the energy storage system to charge.

[0027] When the cloud server determines that the time module T is in valley time and the remaining battery capacity SOC in the energy storage system is not full, the cloud server instructs the energy storage system to charge.

[0028] S13: When the cloud server determines that the time module T is in peak power time and the battery SOC in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge.

[0029] When the cloud server determines that the time module T is in the peak power time and the battery SOC in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge.

[0030] Specifically, the cloud server instructs the energy storage system to charge, which specifically includes: the cloud server sends a charging instruction to the local energy management system EMS through the message queuing telemetry transport (MQTT) protocol, and the EMS forwards it to the energy storage system to achieve the charging function. The cloud server instructs the energy storage system to discharge, which specifically includes: the cloud server sends a discharge instruction to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to achieve the discharge function.

[0031] It should be noted that after the cloud server instructs the energy storage system to charge, the method further includes: when the cloud server determines that the battery remaining power (state of charge, SOC) is full or the time module T is not in the valley time, the cloud server instructs the energy storage system to stop charging; after the cloud server instructs the energy storage system to discharge, the method further includes: when the cloud server determines that the battery SOC is empty or the time module T is not in the peak time, the cloud server instructs the energy storage system to stop discharging.

[0032] The energy storage control method provided in the present application can also support the change of the declared demand of the transformer. When the energy storage system is charging, it is necessary to control the charging power of the energy storage system so that the load power of the transformer is lower than the declared demand value.

[0033] Specifically, the energy storage control method provided in the present application may also include: S21. The cloud server determines the declared demand PX of the transformer corresponding to the energy storage system and the real-time power PS of the transformer.

[0034] S22. When the energy storage system is in a charging state, if the cloud server determines that PS>PX, the cloud server instructs the energy storage system to reduce power until PS=PX; if the cloud server determines that PS<PX, the cloud server instructs the energy storage system to increase power until PS=PX.

[0035] Specifically, the cloud server instructs the energy storage system to reduce power, which specifically includes: the cloud server sends a power reduction instruction to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to achieve the power reduction function; the cloud server instructs the energy storage system to increase power, which specifically includes: the cloud server sends a power increase instruction to the local EMS system through the MQTT protocol, and the EMS system forwards it to the energy storage system to achieve the power increase function.

[0036] It is understandable that a method for controlling energy storage provided by the present application may further include: when the energy storage system is in a charging time period or a discharging time period, the cloud server will detect in real time whether there is a fault in the energy storage system. Once a fault is detected in the energy storage, the cloud server will issue a fault recovery instruction to eliminate the fault in the energy storage system. When the fault still exists after the energy storage system has issued n instructions, the cloud server will trigger an alarm to prompt that the energy storage system has a fault that cannot be restored and that operation and maintenance personnel are required to inspect the energy storage system on site.

[0037] When the cloud server detects that the temperature of the energy storage system exceeds the ambient over-temperature value, the cloud server will send a trip command to the energy storage system, and the energy storage system switch will directly trip and stop charging until it detects that the temperature value drops to 10% below the ambient over-temperature value. During the charging time period, the cloud server will re-send the charging command and power.

[0038] The present application provides a method for energy storage control, which includes: determining peak power periods and valley power periods according to local policies; when the cloud server determines that the time module T is in valley power time and the remaining battery SOC in the energy storage system is not full, the cloud server instructs the energy storage system to charge; when the cloud server determines that the time module T is in peak power time and the battery SOC in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge. This method can be used for peak load shaving and valley filling and power backup. During peak load periods, the electricity price is high and the battery is discharged. During low load periods, the electricity price is low and the battery is charged.

[0039] Referring to the above energy storage control method, the present application also provides an energy storage control system, which is used to execute the above energy storage control method, see Figure 3 ,The energy storage control system includes: a cloud server, EMS and an energy storage system.

[0040] The cloud server is used to determine the peak power period and the valley power period according to local policies; the cloud server is used to instruct the energy storage system to charge when it is determined that the time module T is in the valley power period and the remaining battery SOC in the energy storage system is not full; the cloud server is also used to instruct the energy storage system to discharge when it is determined that the time module T is in the peak power period and the battery SOC in the energy storage system is not empty.

[0041] The cloud server is specifically used to: send charging instructions to the local energy management system EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to realize the charging function; send discharging instructions to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to realize the discharging function.

[0042] The cloud server is also used to: when it is determined that the battery SOC is full or the time module T is not in the valley time, instruct the energy storage system to stop charging; when it is determined that the battery SOC is empty or the time module T is not in the peak time, instruct the energy storage system to stop discharging.

[0043] The cloud server is also used to: determine the declared demand PX of the transformer corresponding to the energy storage system, and the real-time power PS of the transformer; when the energy storage system is in a charging state, if the cloud server determines that PS>PX, the cloud server instructs the energy storage system to reduce power until PS=PX; if the cloud server determines that PS<PX, the cloud server instructs the energy storage system to increase power until PS=PX.

[0044] The cloud server is specifically used to: send a power reduction instruction to the local EMS through the MQTT protocol, which is forwarded by the EMS to the energy storage system to achieve a power reduction function; send a power increase instruction to the local EMS system through the MQTT protocol, which is forwarded by the EMS system to the energy storage system to achieve a power increase function.

[0045] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0046] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0047] In the embodiments provided in this application, it should be understood that the disclosed methods can be implemented in other ways without exceeding the spirit and scope of this application. The current embodiment is only an illustrative example and should not be used as a limitation. The specific content given should not limit the purpose of this application. For example, some features can be ignored or not executed.

[0048] The technical means disclosed in the present application are not limited to the technical means disclosed in the above-mentioned implementation methods, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications are also regarded as the protection scope of this application.

[0049] The above is a detailed introduction to an energy storage control method and system provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those of ordinary skill in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling energy storage, It is characterized in that The method comprises: Determine peak and valley power hours according to local policies; When the cloud server determines that the time module T is in valley time and the remaining battery capacity SOC in the energy storage system is not full, the cloud server instructs the energy storage system to charge; When the cloud server determines that the time module T is in the peak power time and the battery SOC in the energy storage system is not empty, the cloud server instructs the energy storage system to discharge.

2. The energy storage control method according to claim 1, It is characterized in that The cloud server instructing the energy storage system to charge specifically includes: The cloud server sends a charging instruction to the local energy management system EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to realize the charging function; The cloud server instructing the energy storage system to discharge specifically includes: The cloud server sends a discharge instruction to the local EMS via the MQTT protocol, which is then forwarded to the energy storage system to implement the discharge function.

3. The energy storage control method according to claim 1, It is characterized in that After the cloud server instructs the energy storage system to charge, the method further includes: When the cloud server determines that the battery SOC is full or the time module T is not in valley time, the cloud server instructs the energy storage system to stop charging; After the cloud server instructs the energy storage system to discharge, the method further includes: When the cloud server determines that the battery SOC is empty or the time module T is not at the peak power time, the cloud server instructs the energy storage system to stop discharging.

4. The energy storage control method according to claim 1, It is characterized in that The method further comprises: The cloud server determines the declared demand PX of the transformer corresponding to the energy storage system and the real-time power PS of the transformer; When the energy storage system is in a charging state, if the cloud server determines that PS>PX, the cloud server instructs the energy storage system to reduce power until PS=PX; if the cloud server determines that PS<PX, the cloud server instructs the energy storage system to increase power until PS=PX.

5. The energy storage control method according to claim 4, It is characterized in that The cloud server instructing the energy storage system to reduce power specifically includes: The cloud server sends a power reduction instruction to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to achieve a power reduction function; The cloud server instructing the energy storage system to increase power specifically includes: The cloud server sends a power increase instruction to the local EMS system through the MQTT protocol, and the EMS system forwards it to the energy storage system to realize the power increase function.

6. An energy storage control system, It is characterized in that The system includes: a cloud server, an energy storage system, The cloud server is used to determine the peak power period and the valley power period according to local policies; The cloud server is used to instruct the energy storage system to charge when it is determined that the time module T is in valley power time and the remaining battery capacity SOC in the energy storage system is not full; The cloud server is further used to instruct the energy storage system to discharge when it is determined that the time module T is in peak power time and the battery SOC in the energy storage system is not empty.

7. The energy storage control system according to claim 6, It is characterized in that The energy storage control system further includes: an on-site energy management system EMS, and the cloud server is specifically used for: Sending charging instructions to the local energy management system EMS through the MQTT protocol, and forwarding them to the energy storage system by the EMS to realize the charging function; The discharge instruction is sent to the local EMS through the MQTT protocol, and the EMS forwards it to the energy storage system to realize the discharge function.

8. The energy storage control system according to claim 6, It is characterized in that The cloud server is also used for: When it is determined that the battery SOC is full or the time module T is not in valley time, instruct the energy storage system to stop charging; When it is determined that the battery SOC is empty or the time module T is not at the peak power time, the energy storage system is instructed to stop discharging.

9. The energy storage control system according to claim 6, It is characterized in that The cloud server is also used to: determine the declared demand PX of the transformer corresponding to the energy storage system, and the real-time power PS of the transformer; When the energy storage system is in a charging state, if the cloud server determines that PS>PX, the cloud server instructs the energy storage system to reduce power until PS=PX; if the cloud server determines that PS<PX, the cloud server instructs the energy storage system to increase power until PS=PX.

10. The energy storage control system according to claim 6, It is characterized in that The cloud server is specifically used for: Sending a power reduction instruction to the local EMS via the MQTT protocol, which is forwarded by the EMS to the energy storage system to implement a power reduction function; The power increase instruction is sent to the local EMS system through the MQTT protocol, and the EMS system forwards it to the energy storage system to realize the power increase function.

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