Anti-reflux optical storage system power distribution method, device, system and storage medium

Abstract

The application discloses a power distribution method, device and system of a reverse flow prevention light storage system and a storage medium, and applies to the technical field of new energy. The method updates the energy storage charging and discharging plan in combination with a day-ahead prediction curve and day-ahead short-term prediction data. Since the charging and discharging plan is formulated in the day-ahead, and is dynamically corrected in real time in the day, the problem of photovoltaic power consumption rate in the scenario of the reverse flow prevention of the light storage system is solved. Through the technical scheme of the application, the photovoltaic power of the light storage system is timely consumed, and the photovoltaic power consumption rate is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a power distribution method, device, system, and storage medium for a photovoltaic energy storage system with anti-reverse current. Background Technology

[0002] High-energy-consuming enterprises, such as cement plants, are significantly increasing their installed capacity of new energy sources within their plants, installing photovoltaic and energy storage systems to increase the proportion of green electricity used. Due to the increased proportion of new energy, photovoltaic power generation cannot be fully absorbed when load decreases, leading to reverse grid connection issues. Currently, in some reverse-current protection scenarios, upon detection of reverse current, the energy management system quickly issues power reduction commands to photovoltaic systems and standby commands to energy storage systems. Energy storage is then activated only after the reverse current disappears, thus solving the problem of frequent reverse-current protection triggers. However, these measures are taken after reverse current occurs; when reverse current occurs, significant photovoltaic curtailment still exists, resulting in a decrease in the overall photovoltaic power generation absorption rate. Summary of the Invention

[0003] This application provides a power distribution method, apparatus, system, and storage medium for a photovoltaic-storage system with anti-reverse current, aiming to solve the problem of low photovoltaic power consumption rate in anti-reverse current scenarios of photovoltaic-storage systems.

[0004] This application provides a power allocation method for a photovoltaic energy storage system with backflow prevention, the method comprising:

[0005] The reverse flow period within the target time period is determined based on the net load power corresponding to the target time period;

[0006] Determine the overlapping periods between the reverse flow period and the planned discharge period within the target period, as well as other periods within the planned discharge period besides the overlapping periods;

[0007] During the continuous reverse flow process, based on the maximum charging amount corresponding to the charging plan period, the maximum discharging amount corresponding to the other periods, and the net load power, the charging power of the charging plan period, the discharging power of the other periods, and the charging power of the overlapping periods are determined within the target period.

[0008] Optionally, the step of determining the reverse flow period within the target time period based on the net load power corresponding to the target time period includes:

[0009] Obtain the net load power at each moment within the target time period;

[0010] Determine the target time when the net load power is less than the preset net load power;

[0011] The countercurrent period is determined based on the target time.

[0012] Optionally, the step of determining the overlapping period between the reverse flow period and the planned discharge period within the target period, and other periods within the planned discharge period besides the overlapping period, includes:

[0013] Determine whether there is a reverse flow period within the planned discharge period;

[0014] If they exist, the reverse flow period in the discharge plan period is marked as the overlapping period, and the periods other than the overlapping period in the discharge plan period are marked as the other periods.

[0015] Optionally, after determining the overlapping period between the reverse flow period and the planned discharge period within the target period, and other periods within the planned discharge period besides the overlapping period, the method further includes:

[0016] Determine the maximum discharge amount corresponding to the other time periods, the maximum charging amount corresponding to the overlapping time periods, and the maximum charging amount corresponding to the charging plan time periods.

[0017] Optionally, determining the maximum discharge amount corresponding to the other time periods includes:

[0018] Obtain the net load power and rated power of the photovoltaic storage system for the other time periods;

[0019] Select the power with the smallest power from the net load power and the rated power as the target power for the other time periods;

[0020] The maximum discharge amount for the other time periods is determined based on the target power for those other time periods.

[0021] Optionally, determining the maximum charging amount corresponding to the charging plan period includes:

[0022] Obtain the maximum charging power and the net load power corresponding to the charging plan period;

[0023] Determine the power difference between the maximum charging power corresponding to the charging plan period and the net load power corresponding to the charging plan period;

[0024] The power with the smallest power between the differential power and the rated power of the photovoltaic-storage system is selected as the target power for the charging plan period.

[0025] The maximum charging amount corresponding to the charging plan period is determined based on the target power of the charging plan period.

[0026] Optionally, the step of determining the charging power of the planned charging period, the discharging power of the other periods, and the charging power of the overlapping periods within the target period, based on the maximum charging amount corresponding to the planned charging period, the maximum discharging amount corresponding to the other periods, and the net load power during the continuous reverse flow process, includes:

[0027] During the continuous reverse flow process, the net load power corresponding to the overlapping period, the net load power corresponding to the other periods, and the net load power of the charging plan period are obtained;

[0028] The net load power corresponding to the overlapping period is determined as the charging power of the overlapping period, and the net load power corresponding to the other periods is determined as the discharging power of the other periods. The charging power of the charging planned period within the target period is determined based on the maximum discharge amount corresponding to the other periods, the maximum charging amount corresponding to the charging planned period, and the net load power of the charging planned period.

[0029] Optionally, after determining the overlapping period between the reverse flow period and the planned discharge period within the target period, and other periods within the planned discharge period besides the overlapping period, the method further includes:

[0030] Outside of the continuous reverse flow process, the net load power corresponding to the other time periods and the net load power of the charging plan period are obtained. The net load power of the other time periods is determined as the discharge power of the other time periods. The charging power of the charging plan period is determined based on the maximum discharge amount of the other time periods, the maximum charging amount of the charging plan period, and the net load power of the charging plan period.

[0031] Optionally, after determining the charging power of the planned charging period, the discharge power of the other periods, and the charging power of the overlapping periods within the target period based on the maximum charging amount corresponding to the planned charging period, the maximum discharge amount corresponding to the other periods, and the net load power during the continuous reverse flow process, the method further includes:

[0032] A charging and discharging plan for the energy storage device in the photovoltaic-energy storage system is generated based on the charging power during the charging plan period, the discharging power during other periods, and the charging power during overlapping periods.

[0033] The photovoltaic energy storage system is controlled to operate according to the aforementioned charge and discharge plan.

[0034] Optionally, the steps of controlling the photovoltaic energy storage system to operate according to the charge and discharge plan include:

[0035] When a reverse current trigger signal is received during the operation of the photovoltaic storage system, the current operating status of the photovoltaic storage system is obtained;

[0036] The charging and discharging plan is revised based on the described operating status;

[0037] The photovoltaic energy storage system is controlled to operate according to the revised charge and discharge plan.

[0038] Optionally, the step of modifying the charge / discharge plan based on the operating state includes:

[0039] When the current working state of the photovoltaic energy storage system is charging or standby, the real-time difference power between the charging power during the overlapping period and the real-time net load power corresponding to the overlapping period is obtained in the charging and discharging plan.

[0040] When the real-time differential power is less than or equal to the rated power of the photovoltaic-energy storage system, the real-time differential power is determined as the charging power of the photovoltaic-energy storage system during the overlapping period; or,

[0041] When the real-time differential power is greater than the rated power of the photovoltaic energy storage system, the rated power of the photovoltaic energy storage system is determined as the charging power of the photovoltaic energy storage system during the overlapping period.

[0042] Optionally, the step of modifying the charge / discharge plan based on the operating state includes:

[0043] When the current operating state of the photovoltaic energy storage system is the discharge state, obtain the real-time total power between the discharge power of the other time periods and the real-time net load power corresponding to the other time periods in the charge and discharge plan;

[0044] When the real-time total power is greater than the preset power, the real-time net load power corresponding to the other time periods is determined as the charging power of the photovoltaic energy storage system in those other time periods; or,

[0045] When the real-time total power is less than the preset power, the current working state of the photovoltaic energy storage system is switched from the discharge state to the charging state.

[0046] In addition, to achieve the above objectives, the present invention also provides an energy management system, which includes: a light power prediction module, a load analysis module, a day-ahead energy optimization module, and a real-time operation control module, wherein the light power prediction module, the load analysis module, the day-ahead energy optimization module, and the real-time operation control module are connected in sequence.

[0047] Furthermore, to achieve the above objectives, the present invention also provides a power allocation device for a photovoltaic energy storage system that prevents backflow. The power allocation device for a photovoltaic energy storage system includes: a memory, a processor, and a power allocation program for a photovoltaic energy storage system that prevents backflow stored in the memory and can run on the processor. When the power allocation program for a photovoltaic energy storage system is executed by the processor, it implements the steps of the power allocation method for a photovoltaic energy storage system that prevents backflow as described above.

[0048] In addition, to achieve the above objectives, the present invention also provides a computer-readable storage medium storing a reverse-current photovoltaic storage system power allocation program thereon, wherein the reverse-current photovoltaic storage system power allocation program, when executed by a processor, implements the steps of the above-described reverse-current photovoltaic storage system power allocation method.

[0049] This application provides a technical solution for a power allocation method, device, system, and storage medium for a photovoltaic-storage system with anti-reverse current. First, the reverse current period within the target time period is determined based on the net load power corresponding to the target time period. Then, the overlapping periods of the reverse current period and the planned discharge period within the target time period, as well as other periods outside the overlapping periods in the planned discharge period, are determined. Furthermore, during the continuous reverse current, the charging power of the planned charging period, the discharge power of other periods, and the charging power of the overlapping periods within the target time period are determined based on the maximum charging amount corresponding to the planned charging period, the maximum discharge amount corresponding to other periods, and the net load power corresponding to the target time period. This allows for the prediction of the reverse current period, the planned charging period, and other periods for the next day, thereby determining the charging and discharging power of the photovoltaic-storage system in each period. Since the charging and discharging power of the photovoltaic-storage system in each period of the next day can be determined in advance, the problem of low photovoltaic power consumption rate in anti-reverse current scenarios is solved, reducing the amount of photovoltaic curtailment during reverse current events and improving the photovoltaic power consumption rate. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the structure of the anti-reverse current power distribution device for the photovoltaic energy storage system involved in the embodiments of the present invention;

[0051] Figure 2 This is a flowchart illustrating the first embodiment of the power allocation method for the photovoltaic energy storage system with anti-reverse current according to the present invention;

[0052] Figure 3 This is a flowchart illustrating the second embodiment of the power allocation method for the photovoltaic energy storage system with anti-reverse current according to the present invention;

[0053] Figure 4 This is a schematic diagram of the intraday real-time reverse flow control process of the present invention;

[0054] Figure 5 This is a functional block diagram of the energy management system of the present invention.

[0055] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings are only one embodiment and not the entirety of the invention. Detailed Implementation

[0056] To address the issue of low photovoltaic power consumption rate in anti-reverse current scenarios for photovoltaic-storage systems, this application proposes a power allocation method for such systems. This method includes: determining the reverse current period within the target time frame based on the net load power corresponding to the target time frame; then determining the overlapping periods between the reverse current period and the planned discharge period within the target time frame, as well as other periods outside the overlapping periods within the planned discharge period; and further, during the continuous reverse current, determining the charging power of the planned charging period, the discharging power of other periods, and the charging power of the overlapping periods within the target time frame based on the maximum charging amount corresponding to the planned charging period, the maximum discharging amount corresponding to other periods, and the net load power corresponding to the target time frame. This allows for the prediction of the reverse current period, the planned charging period, and other periods for the next day, thereby determining the charging and discharging power of the photovoltaic-storage system in each period. Because the charging and discharging power of the photovoltaic-storage system in each period of the next day can be determined in advance, the amount of photovoltaic power curtailment during reverse current events is reduced, thus improving the photovoltaic power consumption rate.

[0057] Furthermore, during the operation of the photovoltaic-storage system the following day, the system can perform charging and discharging operations according to the pre-determined charging and discharging power for each time period of the following day. During operation, the pre-determined charging and discharging power for each time period can also be adjusted in real time based on the actual operating conditions of the photovoltaic-storage system, thereby improving the photovoltaic power consumption rate.

[0058] In summary, the reverse-current protection method for photovoltaic-storage system power allocation adopted in this application can combine day-ahead forecast curves and intraday real-time monitoring data, i.e., day-ahead net load and intraday net load, to update the energy storage charging and discharging plan, ensuring timely photovoltaic power consumption, preventing curtailment, and improving the photovoltaic power consumption rate.

[0059] To better understand the above technical solutions, exemplary embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0060] like Figure 1 As shown, Figure 1 This is a schematic diagram of the hardware operating environment of the anti-reverse current optical storage power distribution device involved in the embodiments of the present invention.

[0061] like Figure 1 As shown, the anti-reverse current optical storage power distribution device may include: a processor 1001, such as a CPU; a memory 1005; a user interface 1003; a network interface 1004; and a communication bus 1002. The communication bus 1002 is used to establish communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed RAM or a stable, non-volatile memory, such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0062] Those skilled in the art will understand that Figure 1 The structure of the anti-reverse current photovoltaic power distribution device shown in the figure does not constitute a limitation on the anti-reverse current photovoltaic power distribution device. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0063] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and an anti-reverse current optical storage power allocation program. The operating system is a program that manages and controls the hardware and software resources of the anti-reverse current optical storage power allocation device, the anti-reverse current optical storage power allocation program, and the operation of other time-varying software or programs.

[0064] exist Figure 1 In the anti-reverse current optical storage power distribution device shown, the user interface 1003 is mainly used to connect to the terminal and communicate with the terminal; the network interface 1004 is mainly used to connect to the backend server and communicate with the backend server; the processor 1001 can be used to call the anti-reverse current optical storage power distribution program stored in the memory 1005.

[0065] In this embodiment, the anti-reverse current optical storage power distribution device includes: a memory 1005, a processor 1001, and an anti-reverse current optical storage power distribution program stored in the memory and executable on the processor, wherein:

[0066] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it performs the following operations:

[0067] The reverse flow period within the target time period is determined based on the net load power corresponding to the target time period;

[0068] Determine the overlapping periods between the reverse flow period and the planned discharge period within the target period, as well as other periods within the planned discharge period besides the overlapping periods;

[0069] During the continuous reverse flow process, based on the maximum charging amount corresponding to the charging plan period, the maximum discharging amount corresponding to the other periods, and the net load power, the charging power of the charging plan period, the discharging power of the other periods, and the charging power of the overlapping periods are determined within the target period.

[0070] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0071] Obtain the net load power at each moment within the target time period;

[0072] Determine the target time when the net load power is less than the preset net load power;

[0073] The countercurrent period is determined based on the target time.

[0074] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0075] Determine whether there is a reverse flow period within the planned discharge period;

[0076] If they exist, the reverse flow period in the discharge plan period is marked as the overlapping period, and the periods other than the overlapping period in the discharge plan period are marked as the other periods.

[0077] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0078] Determine the maximum discharge amount corresponding to the other time periods, the maximum charging amount corresponding to the overlapping time periods, and the maximum charging amount corresponding to the charging plan time periods.

[0079] Obtain the net load power and rated power of the photovoltaic storage system for the other time periods;

[0080] Select the power with the smallest power from the net load power and the rated power as the target power for the other time periods;

[0081] The maximum discharge amount for the other time periods is determined based on the target power for those other time periods.

[0082] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0083] Obtain the maximum charging power and the net load power corresponding to the charging plan period;

[0084] Determine the power difference between the maximum charging power corresponding to the charging plan period and the net load power corresponding to the charging plan period;

[0085] The power with the smallest power between the differential power and the rated power of the photovoltaic-storage system is selected as the target power for the charging plan period.

[0086] The maximum charging amount corresponding to the charging plan period is determined based on the target power of the charging plan period.

[0087] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0088] During the continuous reverse flow process, the net load power corresponding to the overlapping period, the net load power corresponding to the other periods, and the net load power of the charging plan period are obtained;

[0089] The net load power corresponding to the overlapping period is determined as the charging power of the overlapping period, and the net load power corresponding to the other periods is determined as the discharging power of the other periods. The charging power of the charging planned period within the target period is determined based on the maximum discharge amount corresponding to the other periods, the maximum charging amount corresponding to the charging planned period, and the net load power of the charging planned period.

[0090] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0091] Outside of the continuous reverse flow process, the net load power corresponding to the other time periods and the net load power of the charging plan period are obtained. The net load power of the other time periods is determined as the discharge power of the other time periods. The charging power of the charging plan period is determined based on the maximum discharge amount of the other time periods, the maximum charging amount of the charging plan period, and the net load power of the charging plan period.

[0092] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0093] A charging and discharging plan for the energy storage device in the photovoltaic-energy storage system is generated based on the charging power during the charging plan period, the discharging power during other periods, and the charging power during overlapping periods.

[0094] The photovoltaic energy storage system is controlled to operate according to the aforementioned charge and discharge plan.

[0095] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0096] When a reverse current trigger signal is received during the operation of the photovoltaic storage system, the current operating status of the photovoltaic storage system is obtained;

[0097] The charging and discharging plan is revised based on the described operating status;

[0098] The photovoltaic energy storage system is controlled to operate according to the revised charge and discharge plan.

[0099] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0100] When the current working state of the photovoltaic energy storage system is charging or standby, the real-time difference power between the charging power during the overlapping period and the real-time net load power corresponding to the overlapping period is obtained in the charging and discharging plan.

[0101] When the real-time differential power is less than or equal to the rated power of the photovoltaic-energy storage system, the real-time differential power is determined as the charging power of the photovoltaic-energy storage system during the overlapping period; or,

[0102] When the real-time differential power is greater than the rated power of the photovoltaic energy storage system, the rated power of the photovoltaic energy storage system is determined as the charging power of the photovoltaic energy storage system during the overlapping period.

[0103] When processor 1001 calls the anti-reverse current optical power allocation program stored in memory 1005, it also performs the following operations:

[0104] When the current operating state of the photovoltaic energy storage system is the discharge state, obtain the real-time total power between the discharge power of the other time periods and the real-time net load power corresponding to the other time periods in the charge and discharge plan;

[0105] When the real-time total power is greater than the preset power, the real-time net load power corresponding to the other time periods is determined as the charging power of the photovoltaic energy storage system in those other time periods; or,

[0106] When the real-time total power is less than the preset power, the current working state of the photovoltaic energy storage system is switched from the discharge state to the charging state.

[0107] The technical solution of this application will be specifically described below by way of embodiments.

[0108] First embodiment.

[0109] like Figure 2 As shown, in the first embodiment of this application, overlapping time periods are represented by time period A, other time periods by time period C, and charging plan time periods by time period B. Specifically, the power allocation method for the anti-reverse current photovoltaic energy storage system of this application includes the following steps:

[0110] Step S110: Determine the reverse flow period within the target time period based on the net load power corresponding to the target time period.

[0111] In this embodiment, the anti-reverse-current power allocation method for a photovoltaic-storage system is applied to an anti-reverse-current power allocation device for a photovoltaic-storage system, and the anti-reverse-current power allocation device is communicatively connected to the photovoltaic-storage system. The photovoltaic-storage system includes photovoltaic power generation equipment and energy storage equipment, including energy storage batteries, flywheel energy storage, compressed air energy storage, etc. Optionally, the anti-reverse-current power allocation method for a photovoltaic-storage system can also be applied to the energy management system of a distributed photovoltaic-storage power station. The specific structure of the energy management system of this distributed photovoltaic-storage power station is described later and will not be repeated here.

[0112] Optionally, the target time period can be the entire next day, i.e., from 0:00 to 24:00 the next day, or it can be a specific time period of the next day, i.e., from 8:00 to 12:00 the next day. Optionally, the target time period is not limited to the next day, but can be any time period in the future. The purpose of using the target time period data in this application is to predict and formulate the charging and discharging plan of the photovoltaic and energy storage system. The net load power can be determined based on the difference between the photovoltaic power generation and the user load forecast power. Optionally, the photovoltaic power generation and user load forecast power corresponding to each moment within the target time period can be determined based on the meteorological data of the target time period; the difference between the photovoltaic power generation and the user load forecast power at each moment can be determined; and then the net load power corresponding to the target time period can be determined based on the difference at each moment.

[0113] Optionally, after determining the net load power corresponding to the target time period, the reverse flow period within the target time period can be further determined based on the net load power corresponding to the target time period. Here, the reverse flow period is the time period in which reverse flow occurs. Optionally, determining the reverse flow period within the target time period based on the net load power corresponding to the target time period can be: obtaining the net load power at each moment within the target time period, determining the target moment when the net load power is less than a preset net load power, and then determining the reverse flow period based on the target moment. Here, the preset net load power can be set to 0. Optionally, a net load power curve can be generated based on the net load power at each moment of the next day, and the moments in the net load power curve that are less than 0 can be determined as target moments. All target moments can be aggregated to form the reverse flow period. Optionally, the periods in the net load power curve that are continuously less than 0 can also be determined as reverse flow periods. For example, if the periods in the net load power curve that are less than 0 are the 0-2 period and the 5-6 period, then the 0-2 period and the 5-6 period can be extracted and aggregated to obtain the reverse flow period. Alternatively, the 0-6 period can be determined as the reverse flow period. This application uses the former as an example to determine the reverse flow period.

[0114] Step S120: Determine the overlapping period between the reverse flow period and the discharge plan period within the target period, as well as other periods outside the overlapping period within the discharge plan period.

[0115] In this embodiment, the time-sharing periods differ for different regions. Optionally, the time-sharing periods within the target time period can be determined based on the local power grid operation. Peak periods, normal periods, and off-peak periods are then defined based on these time-sharing periods. The peak periods are designated as the discharge planning periods, while the normal and off-peak periods are designated as the charging planning periods. For example, if the daily peak periods are 7:00-11:00 and 19:00-23:00, the normal periods are 11:00-19:00, and the off-peak periods are 23:00-7:00 the next day, then 7:00-11:00 and 19:00-23:00 can be designated as discharge planning periods, and 11:00-19:00 and 23:00-7:00 the next day can be designated as charging planning periods.

[0116] In this embodiment, after determining the planned charging and discharging periods within the target time period, the reverse current period can be compared with the planned charging and discharging periods within the target time period to correct each period within the target time period. Optionally, the overlapping periods between the reverse current period and the planned discharging periods within the target time period, as well as other periods within the planned discharging periods, can be determined.

[0117] Optionally, it can be determined whether there is a reverse current period within the discharge plan period, that is, whether there is a period within the discharge plan period where the net load power is less than the preset net load power. If so, the reverse current period within the discharge plan period is marked as an overlapping period, and the periods other than the overlapping periods within the discharge plan period are marked as other periods. For example, if the reverse current period within the discharge plan period of 7:00-11:00 is 8:00-9:00, then 8:00-9:00 can be corrected to a charging period and marked as an overlapping period, and the periods of 7:00-7:59 and 9:01-11:00 can be marked as other periods. Optionally, if the net load power at every moment within the discharge plan period is greater than or equal to the preset net load power, then the discharge plan period is not corrected.

[0118] Optionally, after the statistical time periods A / B / C, the time periods can be sorted sequentially, for example: charge (B, 0-8 o'clock), release (C, 8-11 o'clock), charge (A, 11-12 o'clock), release (C, 12-13 o'clock), charge (A, 13-16 o'clock), charge (B, 16-17 o'clock), release (C, 17 o'clock-22 o'clock).

[0119] Step S130: During the continuous reverse flow process, based on the maximum charging amount corresponding to the charging plan period, the maximum discharging amount corresponding to the other periods, and the net load power, determine the charging power of the charging plan period, the discharging power of the other periods, and the charging power of the overlapping periods within the target period.

[0120] In this embodiment, the positions at the end of the first and last countercurrent periods are located and counted as the countercurrent continuous process. The start time of the countercurrent (i.e., the start time of the first countercurrent period) and the end time of the countercurrent (i.e., the end time of the last countercurrent period) are determined based on the countercurrent periods. The time period between the start and end times of the countercurrent is defined as the countercurrent continuous period, which characterizes the countercurrent continuous process.

[0121] Optionally, in order to ensure that there is charging space for energy storage during the day, the energy storage devices in the photovoltaic-energy storage system, such as (B, 0-8 o'clock), can be controlled to not charge more. A threshold for the remaining capacity of the energy storage devices in the photovoltaic-energy storage system can be set, that is, the remaining capacity of the energy storage devices in the photovoltaic-energy storage system is set to 0 at the start time of the first reverse flow period.

[0122] In this embodiment, after determining the duration of the reverse current, during the reverse current process, based on the maximum charging amount corresponding to the charging plan period, the maximum discharging amount corresponding to other periods, and the net load power of the target period, the charging power of the charging plan period, the discharging power of other periods, and the charging power of overlapping periods within the target period are determined, thereby predicting and allocating the charging and discharging power for each period within the target period. The maximum charging amount is the maximum allowable charging amount within the charging plan period, and the maximum discharging amount is the maximum allowable discharging amount within other periods. The net load power of the target period can be the net load power corresponding to each period, i.e., there is a corresponding net load power for periods A / B / C, or it can be the net load power pre-associated with the photovoltaic energy storage system within the target period as the net load power corresponding to different periods within that target period.

[0123] Optionally, before predicting and allocating the charging and discharging power for each time period within the target time period, or during the process, it is also necessary to determine the maximum charging amount corresponding to the overlapping time period, the maximum discharging amount corresponding to other time periods, and the maximum charging amount corresponding to the charging plan time period, that is, to determine the maximum charging amount of time period A, the maximum discharging amount of time period C, and the maximum charging amount of time period B in sequence.

[0124] The maximum charging amount for the overlapping period (i.e., period A) can be determined as follows: First, obtain the net load power and the rated power of the photovoltaic-storage system corresponding to the overlapping period; then, select the power with the smallest value from the net load power and the rated power as the target power for the overlapping period; finally, determine the maximum charging amount corresponding to the overlapping period based on the target power. The net load power corresponding to the overlapping period can be the power corresponding to each overlapping period in the target period, i.e., each period has a corresponding net load power, or it can be the net load power pre-associated with the photovoltaic-storage system within the target period. Determining the maximum charging amount for the overlapping period based on the target power can be obtained by integrating the target power. For example, for period A, which is a charging period, the maximum charging amount for period A is: E A充-T =∫min(P 净负荷功率 P 额定功率 )dt.

[0125] The method for determining the maximum discharge capacity corresponding to other time periods (i.e., time period C) is similar to that for determining the maximum charging capacity corresponding to overlapping time periods. Specifically, the following method can be used: First, obtain the net load power and the rated power of the photovoltaic-storage system corresponding to the other time periods; then, select the one with the smallest power from the net load power and the rated power of the other time periods as the target power of the other time periods; finally, determine the maximum discharge capacity corresponding to the other time periods based on the target power of the other time periods. For example, for time period C, this time period is a discharge period, and the maximum discharge capacity E of time period C is... C放-T =∫min(P 净负荷功率 P 额定功率 )dt.

[0126] The maximum charging capacity corresponding to a charging plan period can be determined as follows: First, obtain the maximum charging power and the net load power corresponding to the charging plan period; then, determine the power difference between the maximum charging power and the net load power; next, select the power difference and the rated power of the photovoltaic-storage system, with the minimum power as the target power for the charging plan period; finally, determine the maximum charging capacity corresponding to the charging plan period based on the target power. For example, for period B, this period is a charging period, and the maximum charging capacity for period B is: E B充-T =∫((P pcc-上限 -P 净负荷功率 ), P 额定功率 )dt; where P pcc-上限 The maximum charging power for a user, i.e., the user's charging constraint limit, can be the user's transformer capacity or demand limit. (P) pcc-上限 -P 净负荷功率 () represents the differential power.

[0127] This application determines the maximum charging and discharging capacity of each time period by using the power of each different time period within the target time period, thereby facilitating energy management of the photovoltaic energy storage system.

[0128] Optionally, after determining the maximum discharge capacity for other time periods, the maximum charging capacity for overlapping time periods, and the maximum charging capacity for the planned charging period using the above methods, it can be further determined whether the current situation is in a continuous reverse current process. If so, the charging power for the planned charging period, the discharge power for other time periods, and the charging power for overlapping time periods within the target time period are determined based on the determined maximum discharge capacity and maximum charging capacity. This enables power prediction and allocation for each time period within the target time period, thereby formulating the day-ahead charging and discharging plan for the photovoltaic-storage system. If not, the charging and discharging power is allocated according to the basic peak shaving and valley filling method.

[0129] Optionally, during the continuous reverse flow process, determining the charging power of the planned charging period, the discharging power of the other periods, and the charging power of the overlapping periods within the target period, based on the maximum charging amount corresponding to the planned charging period, the maximum discharging amount corresponding to the other periods, and the net load power, specifically includes the following steps:

[0130] Step S131: During the reverse flow process, obtain the net load power corresponding to the overlapping period, the net load power corresponding to the other periods, and the net load power of the charging plan period;

[0131] Step S132: Determine the net load power corresponding to the overlapping time period as the charging power of the overlapping time period, determine the net load power corresponding to the other time periods as the discharging power corresponding to the other time periods, and determine the charging power of the charging plan period within the target time period based on the maximum discharge amount corresponding to the other time periods, the maximum charging amount corresponding to the charging plan period, and the net load power of the charging plan period.

[0132] The net load power corresponding to the overlapping period, the net load power corresponding to the other periods, and the net load power of the charging plan period can be determined based on the difference between the photovoltaic power generation and the predicted load power in each period. The charging and discharging power allocation for periods A / B / C during the continuous reverse flow process is as follows:

[0133] P C-放 =P 净负荷功率 , where P C-放 P represents the discharge power corresponding to other time periods. 净负荷功率 This indicates the net load power for other time periods;

[0134] P A-充 =P 净负荷功率 , where P A-充 P represents the charging power during the overlapping period. 净负荷功率 This indicates the net load power corresponding to the overlapping period;

[0135] P B-充 =(∑(E) C放-T )-∑(E B充-T )) / ∑E B充-T )*P 净负荷功率 , where P B-充 P represents the charging power during the planned charging period. 净负荷功率 E represents the net load power during the planned charging period. C放-T E represents the maximum discharge amount corresponding to other time periods. B充-T This indicates the maximum charging amount corresponding to the charging plan period.

[0136] According to the above technical solution, this embodiment determines the net load power corresponding to the overlapping period as the charging power of the overlapping period during the continuous countercurrent process, and determines the net load power corresponding to other periods as the discharging power of the other periods. Based on the maximum discharge amount corresponding to the other periods, the maximum charging amount corresponding to the charging plan period, and the net load power of the charging plan period, the charging power of the charging plan period within the target period is determined. This achieves a reasonable allocation of charging and discharging power for each period within the target period during the continuous countercurrent process, thereby enabling the power generation of the photovoltaic-storage system to be absorbed and improving the power generation absorption rate of the photovoltaic-storage system.

[0137] Optionally, when the current period is outside of the continuous reverse current process, the corresponding time period B / C allocates charging and discharging power according to the basic peak shaving and valley filling method. Optionally, when the current period is outside of the continuous reverse current process, the net load power corresponding to the other time periods and the net load power of the charging plan period are obtained, the net load power of the other time periods is determined as the discharge power of the other time periods, and the charging power of the charging plan period is determined according to the maximum discharge amount of the other time periods, the maximum charging amount of the charging plan period, and the net load power of the charging plan period.

[0138] The charging and discharging power distribution between B and C during the continuous reverse current process is as follows:

[0139] P C-放 =P 净负荷功率 , where P C-放 P represents the discharge power at other times. 净负荷功率 This indicates the net load power for other time periods;

[0140] P B-充 =(∑(E) C放-T ) / ∑E B充-T )*P 净负荷功率 , where P B-充 P represents the charging power during the planned charging period. 净负荷功率 E represents the net load power during the planned charging period. C放-T ∑E represents the maximum discharge amount during other time periods. B充-T This indicates the maximum charging amount during the planned charging period.

[0141] According to the above technical solution, this embodiment reduces electricity costs by allocating charging and discharging power according to the basic peak shaving and valley filling method outside the continuous reverse flow process.

[0142] According to the above technical solution, this embodiment determines the reverse flow period within the target time period based on the net load power corresponding to the target time period. Then, it determines the overlapping period between the reverse flow period and the discharge plan period within the target time period, as well as other periods outside the overlapping period in the discharge plan period. Then, during the continuous reverse flow, it determines the charging power of the charging plan period, the discharge power of other periods, and the charging power of the overlapping period within the target time period based on the maximum charging amount corresponding to the charging plan period, the maximum discharge amount corresponding to other periods, and the net load power corresponding to the target time period. It can predict the reverse flow period, charging plan period, and other periods of the next day in advance, and thus determine the charging and discharging power of the photovoltaic energy storage system in each period. Since the charging and discharging power of the photovoltaic energy storage system in each period of the next day can be determined in advance, the amount of photovoltaic curtailment during reverse flow is reduced, and the photovoltaic power generation absorption rate is improved.

[0143] Second embodiment.

[0144] Reference Figure 3 Following step S130 of the first embodiment, the second embodiment of this application includes steps S210-S220. Specifically, the second embodiment of this application includes the following steps:

[0145] Step S110: Determine the reverse flow period within the target time period based on the net load power corresponding to the target time period;

[0146] Step S120: Determine the overlapping period between the reverse flow period and the discharge plan period within the target period, as well as other periods outside the overlapping period in the discharge plan period;

[0147] Step S130: During the continuous reverse flow process, based on the maximum charging amount corresponding to the charging plan period, the maximum discharging amount corresponding to the other periods, and the net load power, determine the charging power of the charging plan period, the discharging power of the other periods, and the charging power of the overlapping periods within the target period.

[0148] Step S210: Generate a charging and discharging plan for the energy storage device in the photovoltaic-energy storage system based on the charging power during the charging plan period, the discharging power during other periods, and the charging power during overlapping periods.

[0149] In this embodiment, after determining the charging power of the planned charging period within the target time period, the discharging power of other periods, and the charging power of overlapping periods, a charging and discharging plan corresponding to the target time period can be further generated. For example, the generated charging and discharging plan can be: charging (B, 0-8 o'clock, 10KW), discharging (C, 8-11 o'clock, 15KW), charging (A, 11-12 o'clock, 5KW), discharging (C, 12-13 o'clock, 20KW), charging (A, 13-16 o'clock, 2KW), charging (B, 16-17 o'clock, 8KW), discharging (C, 17-22 o'clock, 10KW). The above examples are used to facilitate understanding of the technical solution of this application and do not represent the actual charging and discharging power of this application.

[0150] Step S220: Control the photovoltaic energy storage system to operate according to the charging and discharging plan.

[0151] In this embodiment, after generating the charge and discharge plan for the target time period, the photovoltaic energy storage system can be controlled to operate according to the charge and discharge plan within the target time period. That is, it charges according to the charging power of the overlapping time period, discharges according to the discharging power of other time periods, and charges according to the charging power of the charging plan time period within the charging plan time period.

[0152] According to the above technical solution, this embodiment determines the charging power of the planned charging period, the discharging power of other periods, and the charging power of overlapping periods within the target time period. Based on the charging power of the planned charging period, the discharging power of other periods, and the charging power of overlapping periods, a charging and discharging plan for the energy storage device in the photovoltaic-energy storage system is generated. The photovoltaic-energy storage system is then controlled to operate according to this plan. Because the charging and discharging plan is optimized in advance, in anti-reverse current scenarios, when charging and discharging according to this plan, the power generated by the photovoltaic-energy storage system can be absorbed, thus improving the absorption rate of the photovoltaic-energy storage system's power generation.

[0153] Optionally, during the process of controlling the photovoltaic-storage system to operate according to the charging and discharging plan, the charging and discharging plan of the photovoltaic-storage system can be adjusted in real time according to the operating status of the system, thereby improving the power consumption rate of the photovoltaic-storage system. Specifically, controlling the photovoltaic-storage system to operate according to the charging and discharging plan includes the following steps:

[0154] Step S221: When a reverse current trigger signal is received during the operation of the photovoltaic storage system, the current operating status of the photovoltaic storage system is obtained.

[0155] Step S222: Modify the charge / discharge plan based on the operating state;

[0156] Step S223: Control the photovoltaic energy storage system to operate according to the revised charge and discharge plan.

[0157] In this embodiment, the system detects whether a reverse current trigger signal is received during the operation of the photovoltaic-storage system. Specifically, when the reverse current trigger protection function is detected, a reverse current trigger signal is identified. Upon receiving the reverse current trigger signal, the current operating state of the photovoltaic-storage system is acquired, specifically the operating state at the time the reverse current signal is triggered. This operating state includes at least one of charging, standby, and discharging states. The correction method for the charging / discharging plan differs in each operating state. Therefore, the operating state at the time the reverse current signal is triggered can be determined, and the corresponding charging / discharging plan correction method can be determined. Based on this correction method, the charging / discharging plan for that operating state is corrected, and the photovoltaic-storage system is then controlled to operate according to the corrected charging / discharging plan. Since the corrected charging / discharging plan is more accurate, operating according to the corrected plan can better improve the power consumption rate of the photovoltaic-storage system.

[0158] Reference Figure 4 , Figure 4 This application describes a specific implementation method for correcting the operating state when the system operates according to a predetermined charge / discharge plan. This includes methods for correcting the charge / discharge plan when the photovoltaic energy storage system is currently in a charging or standby state, and methods for correcting the charge / discharge plan when the system is currently in a discharging state.

[0159] Specifically, modifying the charge / discharge plan based on the operating state includes the following steps:

[0160] Step S2221: When the current working state of the photovoltaic energy storage system is charging state or standby state, obtain the real-time difference power between the charging power of the overlapping period and the real-time net load power corresponding to the overlapping period in the charging and discharging plan.

[0161] Step S2222: When the real-time differential power is less than or equal to the rated power of the photovoltaic energy storage system, the real-time differential power is determined as the charging power of the photovoltaic energy storage system during the overlapping period; or,

[0162] Step S2223: When the real-time differential power is greater than the rated power of the photovoltaic energy storage system, the rated power of the photovoltaic energy storage system is determined as the charging power of the photovoltaic energy storage system during the overlapping period.

[0163] In this embodiment, the real-time net load power is the measured power value.

[0164] When a reverse current phenomenon is triggered during standby and charging, the power is adjusted according to the following judgment logic:

[0165] (1)P A-充 -P 实时净负荷功率 ≤P额定功率 At that time, the real-time difference between the charging power during the overlapping period and the real-time net load power corresponding to the overlapping period, i.e., P, is calculated. A-充 -P 实时净负荷功率 The charging power of the photovoltaic energy storage system during the overlapping period is determined.

[0166] (2)P A-充 -P 实时净负荷功率 >P 额定功率 At that time, the rated power P of the photovoltaic energy storage system will be... 额定功率 The charging power of the photovoltaic-storage system during the overlapping period is determined, and the target photovoltaic power generation is reduced by P. 实时净负荷功率 Among them, P A-充 P represents the charging power during the overlapping period. 额定功率 P represents the rated power of the photovoltaic energy storage system. 实时净负荷功率 This indicates the real-time net load power corresponding to the overlapping period.

[0167] According to the above technical solution, this application allows for the determination of the real-time differential power as the charging power of the photovoltaic-storage system during the overlapping period when the real-time differential power is less than or equal to the rated power of the photovoltaic-storage system, or when the real-time differential power is greater than the rated power of the photovoltaic-storage system, the rated power of the photovoltaic-storage system is determined as the charging power of the photovoltaic-storage system during the overlapping period. This enables the adjustment of the charging and discharging plan when the reverse current trigger protection function is detected, and when the photovoltaic-storage system is currently in a charging or standby state, thereby improving the absorption rate of the photovoltaic-storage system's power generation in the charging or standby state.

[0168] Specifically, modifying the charge / discharge plan based on the operating state further includes the following steps:

[0169] Step S2224: When the current working state of the photovoltaic energy storage system is the discharge state, obtain the real-time total power between the discharge power of the other time periods and the real-time net load power corresponding to the other time periods in the charge and discharge plan.

[0170] Step S2225: When the real-time total power is greater than the preset power, the real-time net load power corresponding to the other time periods is determined as the charging power of the photovoltaic energy storage system in the other time periods; or,

[0171] Step S2226: When the real-time total power is less than the preset power, the current working state of the photovoltaic energy storage system is switched from the discharge state to the charging state.

[0172] In this embodiment, the preset power can be set to 0.

[0173] When a reverse current phenomenon is triggered during discharge, the power is adjusted according to the following judgment logic:

[0174] (1)P C-放 +P 实时净负荷功率 When the power is >0, the charging power of the photovoltaic energy storage system is rapidly increased according to P during the other time periods. 实时净负荷功率 Issued.

[0175] (2)P C-放 +P 实时净负荷功率 When the value is less than 0, the current working state of the photovoltaic energy storage system will be switched from the discharge state to the charging state.

[0176] According to the above technical solution, this application allows for the following: when the current operating state of the photovoltaic-storage system is in a discharging state, and the real-time total power is greater than a preset power, the real-time net load power corresponding to other time periods can be determined as the charging power of the photovoltaic-storage system in those other time periods; or, when the real-time total power is less than the preset power, the current operating state of the photovoltaic-storage system can be switched from the discharging state to the charging state. This enables the adjustment of the charging and discharging plan when the reverse current trigger protection function is detected and the current operating state of the photovoltaic-storage system is in a discharging state, thereby improving the absorption rate of the photovoltaic-storage system's power generation in the discharging state.

[0177] According to the above technical solution, this embodiment uses the anti-reverse current photovoltaic-storage system power allocation method adopted in this application to update the energy storage charging and discharging plan by combining the day-ahead forecast curve and intraday short-term forecast data, which ensures timely consumption of photovoltaic power and prevents curtailment, thereby improving the photovoltaic power consumption rate.

[0178] This invention provides an embodiment of a power allocation method for a photovoltaic energy storage system to prevent reverse current. It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0179] like Figure 5 As shown, this application provides an energy management system, which includes: a photovoltaic power prediction module, a load analysis module, a day-ahead energy optimization module, and a real-time operation control module. This energy management system establishes communication connections sequentially with a photovoltaic energy storage system, a photovoltaic inverter, and an inverter power protection device. Specifically, the energy management system proposed in this application has the following characteristics:

[0180] First, the photovoltaic power prediction module can combine meteorological data to predict short-term and ultra-short-term photovoltaic power generation.

[0181] Second, the load analysis module automatically generates the load curve for the next day after the user fills in the production plan for the next day and combines it with the user's predicted load power.

[0182] Third, the daytime energy optimization module, in conjunction with the optical power prediction module and the load analysis module, outputs the next day's photovoltaic and energy storage charging and discharging plan, especially the energy storage plan, under the requirement of preventing backflow.

[0183] Fourth, the real-time operation control module adjusts the charging and discharging power of the photovoltaic and energy storage system, especially the energy storage system, in real time based on the real-time operating status of the photovoltaic and energy storage system and the day-ahead operating plan.

[0184] The specific implementation of the photovoltaic energy storage system of the present invention is basically the same as the various embodiments of the above-described anti-reverse photovoltaic energy storage system power allocation method, and will not be repeated here.

[0185] Based on the same inventive concept, this application also provides a computer-readable storage medium storing a power allocation program for an anti-reverse current optical storage system. When the anti-reverse current optical storage system power allocation program is executed by a processor, it implements each step of the anti-reverse current optical storage system power allocation method described above and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0186] Since the storage medium provided in this application embodiment is the storage medium used to implement the method of this application embodiment, those skilled in the art can understand the specific structure and variations of the storage medium based on the method described in this application embodiment, and therefore will not be repeated here. All storage media used in the method of this application embodiment are within the scope of protection of this application.

[0187] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0188] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0189] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0190] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0191] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0192] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0193] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A power distribution method for a photovoltaic energy storage system with anti-reverse current capability, characterized in that, The power allocation method for the anti-reverse current photovoltaic energy storage system includes: The reverse flow period within the target time period is determined based on the net load power corresponding to the target time period; Determine the overlapping periods between the reverse flow period and the planned discharge period within the target period, as well as other periods within the planned discharge period besides the overlapping periods; During the continuous reverse flow process, based on the maximum charging amount corresponding to the charging plan period, the maximum discharging amount corresponding to the other periods, and the net load power, the charging power of the charging plan period, the discharging power of the other periods, and the charging power of the overlapping periods are determined within the target period. Based on the charging power during the scheduled charging period, the discharging power during other periods, and the charging power during overlapping periods, a charging and discharging plan for the energy storage devices in the photovoltaic-storage system is generated. When a reverse current trigger signal is received during the operation of the photovoltaic storage system, the current operating status of the photovoltaic storage system is obtained; The charging and discharging plan is modified based on the operating state, wherein the operating state includes at least one of charging state, standby state and discharging state, and the modification method of the charging and discharging plan is different for each operating state. The photovoltaic energy storage system is controlled to operate according to the revised charge and discharge plan.

2. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 1, characterized in that, The step of determining the reverse flow period within the target period based on the net load power corresponding to the target period includes: Obtain the net load power at each moment within the target time period; Determine the target time when the net load power is less than the preset net load power; The countercurrent period is determined based on the target time.

3. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 1, characterized in that, The step of determining the overlapping period between the reverse flow period and the planned discharge period within the target period, and other periods within the planned discharge period besides the overlapping period, includes: Determine whether there is a reverse flow period within the planned discharge period; If they exist, the reverse flow period in the discharge plan period is marked as the overlapping period, and the periods other than the overlapping period in the discharge plan period are marked as the other periods.

4. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 1, characterized in that, After determining the overlapping period between the reverse flow period and the planned discharge period within the target period, and other periods outside the overlapping period in the planned discharge period, the method further includes: Determine the maximum discharge amount corresponding to the other time periods, the maximum charging amount corresponding to the overlapping time periods, and the maximum charging amount corresponding to the charging plan time periods.

5. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 4, characterized in that, Determining the maximum discharge amount corresponding to the other time periods includes: Obtain the net load power and rated power of the photovoltaic storage system for the other time periods; Select the power with the smallest power from the net load power and the rated power as the target power for the other time periods; The maximum discharge amount for the other time periods is determined based on the target power for those other time periods.

6. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 4, characterized in that, Determining the maximum charging amount corresponding to the charging plan period includes: Obtain the maximum charging power and the net load power corresponding to the charging plan period; Determine the power difference between the maximum charging power corresponding to the charging plan period and the net load power corresponding to the charging plan period; The power with the smallest power between the differential power and the rated power of the photovoltaic-storage system is selected as the target power for the charging plan period. The maximum charging amount corresponding to the charging plan period is determined based on the target power of the charging plan period.

7. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 4, characterized in that, The step of determining the charging power of the planned charging period, the discharging power of the other periods, and the charging power of the overlapping periods within the target period, based on the maximum charging amount corresponding to the planned charging period, the maximum discharging amount corresponding to the other periods, and the net load power during the continuous reverse flow process, includes: During the continuous reverse flow process, the net load power corresponding to the overlapping period, the net load power corresponding to the other periods, and the net load power of the charging plan period are obtained; The net load power corresponding to the overlapping period is determined as the charging power of the overlapping period, and the net load power corresponding to the other periods is determined as the discharging power of the other periods. The charging power of the charging planned period within the target period is determined based on the maximum discharge amount corresponding to the other periods, the maximum charging amount corresponding to the charging planned period, and the net load power of the charging planned period.

8. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 4, characterized in that, After determining the overlapping period between the reverse flow period and the planned discharge period within the target period, and other periods outside the overlapping period in the planned discharge period, the method further includes: Outside of the continuous reverse flow process, the net load power corresponding to the other time periods and the net load power of the charging plan period are obtained. The net load power of the other time periods is determined as the discharge power of the other time periods. The charging power of the charging plan period is determined based on the maximum discharge amount of the other time periods, the maximum charging amount of the charging plan period, and the net load power of the charging plan period.

9. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 1, characterized in that, The step of modifying the charge / discharge plan based on the operating state includes: When the current working state of the photovoltaic energy storage system is charging or standby, the real-time difference power between the charging power during the overlapping period and the real-time net load power corresponding to the overlapping period is obtained in the charging and discharging plan. When the real-time differential power is less than or equal to the rated power of the photovoltaic-energy storage system, the real-time differential power is determined as the charging power of the photovoltaic-energy storage system during the overlapping period; or, When the real-time differential power is greater than the rated power of the photovoltaic energy storage system, the rated power of the photovoltaic energy storage system is determined as the charging power of the photovoltaic energy storage system during the overlapping period.

10. The power allocation method for a photovoltaic energy storage system with anti-reverse current as described in claim 1, characterized in that, The step of modifying the charge / discharge plan based on the operating state includes: When the current operating state of the photovoltaic energy storage system is the discharge state, obtain the real-time total power between the discharge power of the other time periods and the real-time net load power corresponding to the other time periods in the charge and discharge plan; When the real-time total power is greater than the preset power, the real-time net load power corresponding to the other time periods is determined as the charging power of the photovoltaic energy storage system in those other time periods; or, When the real-time total power is less than the preset power, the current working state of the photovoltaic energy storage system is switched from the discharge state to the charging state.

11. A power distribution device for a photovoltaic energy storage system with anti-reverse current capability, characterized in that, The anti-backflow power allocation device for a photovoltaic energy storage system includes: a memory, a processor, and an anti-backflow power allocation program for a photovoltaic energy storage system stored in the memory and executable on the processor. When the anti-backflow power allocation program for a photovoltaic energy storage system is executed by the processor, it implements the steps of the anti-backflow power allocation method for a photovoltaic energy storage system as described in any one of claims 1-10.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a power allocation program for an anti-reverse-current photovoltaic energy storage system, which, when executed by a processor, implements the steps of the power allocation method for an anti-reverse-current photovoltaic energy storage system as described in any one of claims 1-10.

13. An energy management system, characterized in that, The energy management system includes a photovoltaic power prediction module, a load analysis module, a day-ahead energy optimization module, and a real-time operation control module, which are sequentially connected in communication. The daytime energy optimization module is used to perform the steps of the anti-reverse flow power allocation method for a photovoltaic-storage system as described in any one of claims 1-10.

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