Load control method and device, equipment and medium

Abstract

The invention discloses a load control method, device and equipment and a medium, and the method comprises the steps: obtaining the active power of a grid-connected point at the grid-connected point, and determining the photovoltaic residual power of an optical storage system based on the active power of the grid-connected point, and enabling the direction of the power flowing into a power grid to be a positive direction; based on the photovoltaic residual power, the preset priorities of the n intelligent loads and the rated power of each intelligent load, starting operation or stopping operation of the n intelligent loads is controlled according to a preset rule, i is a positive integer and represents the rated power of the i intelligent load, and the preset rule comprises the steps that when the photovoltaic residual power is larger than 0, the intelligent load with the high preset priority is started preferentially, and when the photovoltaic residual power is larger than 0, the intelligent load with the high preset priority is started preferentially; and when the photovoltaic residual power is less than 0, the low-preset-priority intelligent load is stopped preferentially. According to the scheme provided by the invention, a control scheme for the intelligent load in the optical storage system is provided, so that the effects of remarkably improving the self-generation and self-use rate of the optical storage system and maximizing the benefits of photovoltaic power generation are achieved.

Description

Technical Field

[0001] This application belongs to the field of load management technology, and in particular relates to a load control method, device, equipment and medium. Background Technology

[0002] With the rapid development of photovoltaic (PV) power generation and energy storage technologies, distributed PV-storage systems have been widely applied in residential, commercial, and industrial settings. These systems generate electricity during the day using PV modules, prioritizing supply to local loads, while storing surplus energy in storage batteries or feeding it back to the grid when conditions permit. At night or when sunlight is insufficient, the storage batteries release stored energy to power the loads, maximizing the utilization of PV power generation. User load types in PV-storage systems primarily include ordinary loads and smart loads. Ordinary loads are mostly manually started and stopped by the user, unable to communicate with the PV-storage system or be directly managed by it; while smart loads can connect to the PV-storage system via wired or wireless communication, allowing the system to directly or indirectly control their start and stop. For example, smart loads may have their own switch control function, or a smart switch may be connected between the load and the power source, with the PV-storage system controlling the switch's on / off state to achieve load control.

[0003] However, the relevant technologies lack control schemes for smart loads in photovoltaic storage systems. Summary of the Invention

[0004] This application provides an implementation scheme that differs from related technologies, in order to solve the technical problem of the lack of a control scheme for intelligent loads in optical storage systems in related technologies.

[0005] In a first aspect, this application provides a load control method applied to a photovoltaic-storage system, wherein the photovoltaic-storage system is connected to a power grid and n smart loads, where n is a positive integer ≥1, the inverter output of the photovoltaic-storage system has a grid connection point with the power grid, and the smart loads establish communication with the photovoltaic-storage system, the method comprising: Obtain the active power at the grid connection point. And based on the active power of the grid connection point The surplus photovoltaic power of the photovoltaic-storage system is determined, wherein the direction of power flowing into the power grid is as follows: The positive direction; Based on the photovoltaic surplus power, the preset priorities of the n smart loads, and the rated power of each smart load. The system controls the start-up or shutdown of the n intelligent loads according to preset rules, where i is a positive integer. The rated power of the i-th smart load is represented by the preset rule, which includes: when the photovoltaic residual power is greater than 0, the smart load with higher preset priority is started first; when the photovoltaic residual power is less than 0, the smart load with lower preset priority is stopped first.

[0006] Secondly, this application provides a load control device applied to a photovoltaic-storage system. The photovoltaic-storage system is connected to a power grid and n smart loads, where n is a positive integer ≥ 1. A grid connection point is provided between the inverter output of the photovoltaic-storage system and the power grid. The smart loads establish communication with the photovoltaic-storage system. The device includes: The acquisition unit is used to acquire the active power at the grid connection point of the photovoltaic-storage system. and the active power of the grid connection point The surplus photovoltaic power from the photovoltaic-storage system is identified as follows: the direction of power flow into the grid is... The positive direction; The control unit is configured to, based on the surplus photovoltaic power, the preset priorities of the n smart loads, and the rated power of each smart load,... The system controls the start-up or shutdown of the n intelligent loads according to preset rules, where i is a positive integer. The rated power of the i-th smart load is represented by the preset rule, which includes: when the photovoltaic residual power is greater than 0, the smart load with higher preset priority is started first; when the photovoltaic residual power is less than 0, the smart load with lower preset priority is stopped first.

[0007] Thirdly, this application provides an electronic device, comprising: Processor; and Memory for storing the executable instructions of the processor; The processor is configured to execute the first aspect, or any method in any possible implementation of the first aspect, by executing the executable instructions.

[0008] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the first aspect, or any method in any possible implementation of the first aspect.

[0009] This application provides the method for obtaining the active power at the grid connection point. And based on the active power at the grid connection point Determine the surplus photovoltaic power of the photovoltaic-storage system, wherein the direction of power flow into the grid is: The positive direction; based on photovoltaic surplus power, the preset priority of n smart loads, and the rated power of each smart load. It controls the start-up or shutdown of n intelligent workloads according to preset rules, where i is a positive integer. This represents the rated power of the i-th smart load. The preset rules include: when the photovoltaic surplus power is greater than 0, priority is given to starting high-priority smart loads; when the photovoltaic surplus power is less than 0, priority is given to stopping low-priority smart loads. This scheme utilizes the real-time status of the photovoltaic surplus power as a basis for judgment. When photovoltaic power generation is sufficient, priority is given to activating high-priority smart loads to increase user-side electricity consumption and the proportion of photovoltaic self-consumption; when photovoltaic power generation is insufficient, priority is given to cutting off low-priority smart loads to reduce electricity purchases from the grid. This provides a control scheme for smart loads in a photovoltaic-storage system, thereby achieving the technical effect of significantly improving the self-consumption rate of the photovoltaic-storage system and maximizing the benefits of photovoltaic power generation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A schematic diagram of the structure of a storage system with an intelligent load provided in an embodiment of this application; Figure 2 A schematic diagram illustrating a first manifestation of a smart load provided in an embodiment of this application; Figure 3 A schematic diagram illustrating a second manifestation of a smart load provided in an embodiment of this application; Figure 4 A schematic flowchart of a load control method provided in an embodiment of this application; Figure 5 A flowchart illustrating the load control method corresponding to Strategy 1 provided in this application embodiment; Figure 6 A flowchart illustrating the load control method corresponding to strategy 2 in one embodiment of this application is provided. Figure 7 A schematic diagram of the structure of the load control device provided in the embodiments of this application. Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0011] The embodiments of this application are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0012] The terms "first" and "second," etc., used in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the solution can be implemented in a different order than that illustrated or described in this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0013] First, some terms used in the embodiments of this application will be explained below to facilitate understanding by those skilled in the art.

[0014] Photovoltaic-storage system: refers to an energy system that includes photovoltaic power generation modules and energy storage batteries, which can store the electrical energy generated by photovoltaics and release it on demand.

[0015] Ordinary load: refers to load devices that are manually controlled to start and stop by the user, cannot communicate with the optical storage system, and are not directly managed by the optical storage system.

[0016] Intelligent load: refers to a load device that can be connected to the photovoltaic storage system via wired or wireless communication and whose start-up and shutdown are controlled by the photovoltaic storage system.

[0017] Photovoltaic surplus power: refers to the photovoltaic power remaining in a photovoltaic-storage system after meeting the electricity needs of ordinary loads and the charging needs of energy storage batteries, which can be used to supply smart loads or be transmitted to the grid.

[0018] Active power at grid connection point : refers to the active power at the connection point between the inverter output of the photovoltaic-storage system and the power grid. It is a positive value when the power flows to the power grid and a negative value when the power is purchased from the power grid.

[0019] Maximum self-consumption mode: refers to a working mode of photovoltaic-storage system. In this mode, photovoltaic power is given priority to local loads, and the remaining power is stored in energy storage batteries. Only the remaining power is then transmitted to the grid to maximize the local utilization of photovoltaic power generation.

[0020] With the rapid development of photovoltaic power generation and energy storage technologies, distributed photovoltaic-storage systems have been widely used in residential, commercial, and industrial settings. These systems typically employ a maximum self-consumption model. During the day when there is sunlight, photovoltaic power is prioritized for supplying user loads, with any remaining power stored in storage batteries. The surplus power is then fed back to the grid. At night, when there is no photovoltaic power, the storage batteries can release the stored energy to supply loads, maximizing the utilization of photovoltaic power.

[0021] User loads are diverse, mainly falling into two categories: ordinary loads and intelligent loads. Ordinary loads are mostly manually controlled for starting and stopping, do not establish communication with the photovoltaic and energy storage system, and are not controlled by the system. Intelligent loads, on the other hand, can connect to the photovoltaic and energy storage system via communication and can be controlled for starting and stopping by the system.

[0022] Some users are sometimes unable to sell their surplus photovoltaic power to the grid or the electricity price is too low. In order to maximize and optimize the use of photovoltaic power, smart loads are connected to the photovoltaic-storage system. Unlike ordinary loads, these smart loads do not need to work continuously; they only start working when there is surplus photovoltaic power in the system.

[0023] However, since photovoltaic surplus power is related to various factors such as light intensity and the size of ordinary loads, an algorithm is needed to estimate photovoltaic surplus power. When multiple smart loads are connected to the photovoltaic-storage system, there is a lack of effective control schemes in related technologies to determine which smart loads should be activated based on the estimated photovoltaic surplus power and which smart loads should be activated first.

[0024] To address this technical problem, this application provides a load control method, apparatus, device, and medium for solving the start-stop control problem of intelligent loads in optical storage systems.

[0025] The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of a structure for connecting smart loads in a photovoltaic energy storage system, which is an exemplary embodiment of this application. The photovoltaic energy storage system is connected to the power grid, ordinary loads and n smart loads, where n is a positive integer ≥1. A grid connection point is provided between the inverter output terminal of the photovoltaic energy storage system and the power grid. A power sensor is provided at the grid connection point to collect the active power at the grid connection point.

[0027] In some embodiments, the photovoltaic-storage system includes: photovoltaic modules, energy storage batteries, and inverters.

[0028] Among them, photovoltaic modules are used to convert solar energy into electrical energy; energy storage batteries are used to store the excess electrical energy generated by photovoltaic modules; and inverters are used to convert direct current to alternating current and control the flow of electrical energy.

[0029] Ordinary loads are connected to the photovoltaic and energy storage system, but do not establish communication with it; their start and stop are manually controlled by the user. Ordinary loads have the highest priority, and the photovoltaic and energy storage system prioritizes supplying power to them.

[0030] Please see Figures 2 to 3 , Figures 2 to 3 These are all schematic diagrams illustrating the manifestation of intelligent loads provided in the embodiments of this application.

[0031] In some embodiments, the smart load is communicatively connected to the optical storage system and controlled by the optical storage system to perform startup or shutdown, wherein the smart load achieves control in one of the following ways: The intelligent load integrates a communication and control module, which receives and executes start / stop commands from the photovoltaic storage system; or A smart switch is connected in series in the power supply circuit of the smart load. The photovoltaic energy storage system indirectly controls the start and stop of the smart load by controlling the on and off of the smart switch.

[0032] Please see Figure 2 In some embodiments, the smart load itself integrates a communication and control module, which is used to receive and execute start and stop commands from the optical storage system. The smart load itself can be connected to the optical storage system through wired or wireless communication. After the optical storage system establishes communication with the smart load, it directly controls the start and stop of the smart load.

[0033] Please see Figure 3 In other embodiments, a smart switch is connected between the smart load and the optical storage system. The smart switch can be connected to the optical storage system via wired or wireless communication. After the optical storage system establishes communication with the smart switch, it can control the on / off state of the smart switch to indirectly control the start and stop of the load.

[0034] In maximum self-consumption mode, since the start-up or shutdown of ordinary loads cannot be controlled, excess photovoltaic energy will preferentially flow to ordinary loads, thus giving them the highest priority. The photovoltaic-storage system prioritizes powering ordinary loads, and the remaining power is prioritized to charge the energy storage battery. The final remaining power is photovoltaic surplus electricity, which can be used to start smart loads or fed into the grid.

[0035] The execution principles and interaction processes of each component in this architecture embodiment can be found in the descriptions of the following method embodiments.

[0036] Figure 4 This is a flowchart illustrating a load control method provided as an exemplary embodiment of this application. The method is applicable to a photovoltaic-storage system, where the system is connected to the power grid and n smart loads, where n is a positive integer ≥ 1. The inverter output of the photovoltaic-storage system has a grid connection point with the power grid, and the smart loads establish communication with the system. The method includes at least the following steps: Step 110: Obtain the active power at the grid connection point. And based on the active power at the grid connection point Determine the surplus photovoltaic power of the photovoltaic-storage system, wherein the direction of power flow into the grid is: The positive direction.

[0037] In some embodiments, the active power at the grid connection point of the photovoltaic system is obtained. ,include: By installing power sensors at the grid connection point, the active power at the grid connection point is collected, and the collected active power is determined as the grid connection point active power of the photovoltaic system. .

[0038] Specifically, in maximum self-consumption mode, the photovoltaic-storage system prioritizes powering ordinary loads, and the remaining power is prioritized for charging the energy storage batteries. Therefore, the active power at the grid connection point... It can indirectly reflect the surplus photovoltaic power in the system. When When ≥0, it indicates that there is surplus photovoltaic power in the system, which can be used to start smart loads or fed into the grid; when When the value is less than 0, it indicates that there is no surplus photovoltaic power in the system and that the grid connection point is purchasing electricity.

[0039] Step 120: Based on the surplus photovoltaic power, the preset priorities of n smart loads, and the rated power of each smart load. It controls the start-up or shutdown of n intelligent workloads according to preset rules, where i is a positive integer. This represents the rated power of the i-th smart load. The preset rules include: when the photovoltaic surplus power is greater than 0, the smart load with higher preset priority is started first; when the photovoltaic surplus power is less than 0, the smart load with lower preset priority is stopped first.

[0040] The preset priority of the intelligent load balancer, i.e. the preset startup order, can be set by the user according to their actual needs.

[0041] The rated power of a smart load is its power consumption. If the surplus photovoltaic power is less than the rated power of the smart load, it means that the surplus photovoltaic power is insufficient to support the smart load and the smart load cannot be started. If the smart load is started, the grid connection point will have to purchase electricity. If the surplus photovoltaic power is greater than the rated power of the smart load, it means that the surplus photovoltaic power can support the smart load and the smart load can be started.

[0042] In some embodiments, the system can also be based on the surplus photovoltaic power, the real-time priorities of the n smart loads, and the rated power of each smart load. It controls the startup or shutdown of n intelligent loads according to preset rules. The real-time priority of the intelligent loads can be dynamically adjusted in real time in response to factors such as user preferences, electricity prices, load importance, and predicted light intensity.

[0043] In this embodiment, the photovoltaic surplus power, the preset priority of n smart loads, and the rated power of each smart load are used. There are two control strategies for controlling the start-up or shutdown of n intelligent loads according to preset rules: Strategy 1 and Strategy 2. In practical applications, one strategy can be selected according to requirements, or the strategy can be switched according to the user's input strategy switching command.

[0044] In some embodiments, in strategy 1, the system is based on surplus photovoltaic power, the preset priorities of n smart loads, and the rated power of each smart load. Controlling the start-up, operation, or shutdown of n intelligent loads includes the following steps 01 to 04: Step 01, when If the value is ≥0, iterate through the n smart loads that have not been started, in descending order of their preset priority.

[0045] Specifically, when When the value is ≥0, it indicates that there is remaining photovoltaic power in the system that can be used to start smart loads. The photovoltaic-storage system traverses the n smart loads in descending order of preset priority and determines whether each smart load meets the start-up conditions in sequence.

[0046] In some embodiments, the priority order can be pre-configured by the user through the control interface of the photovoltaic storage system. For example, smart loads with higher preset priority may be devices that are more important to the user (such as water heaters), while those with lower preset priority may be auxiliary devices (such as electric vehicle charging stations). The traversal process starts with the highest priority unstarted smart load and determines its start-up conditions one by one.

[0047] Step 02: For the i-th unactivated smart load encountered during the current iteration, compare its rated power. With photovoltaic surplus power Size.

[0048] Step 03, if < If the i-th unstarted smart load is not started, continue iterating through the (i+1)-th unstarted smart load.

[0049] Step 04, if ≥ Then, the i-th non-started smart load is started, based on the updated active power at the grid connection point. Once the new photovoltaic surplus power is identified, the process of traversing the unstarted smart loads is repeated.

[0050] In some embodiments, based on the updated active power at the grid connection point Identifying new surplus photovoltaic power includes: updating the active power at the grid connection point. As a new source of surplus photovoltaic power.

[0051] In some embodiments, in strategy 1, the system is based on surplus photovoltaic power, the preset priorities of n smart loads, and the rated power of each smart load. Controlling the start-up, operation, or shutdown of n intelligent loads also includes the following steps 05 to 08: Step 05, if <0, iterate through the started smart loads among the n smart loads in order of preset priority from low to high.

[0052] Specifically, when When the value is less than 0, it indicates that there is no remaining photovoltaic power in the system and that the grid connection point is purchasing electricity (i.e., purchasing electricity from the grid to meet load demand). To avoid purchasing electricity, the photovoltaic-storage system iterates through the n smart loads in ascending order of preset priority and determines in turn whether the smart loads should be controlled to stop operating.

[0053] Step 06: For the i-th started smart load currently being traversed, control the i-th started smart load to stop running, and based on the updated active power at the grid connection point... Identify new surplus photovoltaic power.

[0054] Step 07, if the updated If the value is ≥0, then stop traversing and do not stop other started smart workloads.

[0055] Step 08, if the updated If <0, continue iterating through the (i+1)th started smart workload and stopping it, until the updated one is reached. ≥0.

[0056] Please see Figure 5 , Figure 5 A flowchart illustrating the load control method corresponding to Strategy 1 provided in this application embodiment is shown, specifically including: S51: Calculate surplus photovoltaic power.

[0057] Specifically, the active power measured by the power sensor at the grid connection point can be... As surplus electricity from photovoltaic power generation.

[0058] S52: Determining Residual Photovoltaic Power Size, if If ≥0, execute S53, if <0, execute S58.

[0059] S53: Sort the unstarted smart loads from high to low according to the preset priority, and compare the rated power of the unstarted smart loads with the photovoltaic surplus power in turn.

[0060] Specifically, when When the value is ≥0, it indicates that there is residual photovoltaic power in the system. According to the set priority of the smart loads, the priority of the unactivated smart loads is sorted from high to low, with the highest priority smart load numbered 1, and so on. Following the above sorting order, the rated power of the unactivated smart loads is compared with the residual photovoltaic power.

[0061] S54: Let the rated power of the i-th intelligent load be denoted as... .

[0062] S55: Comparison and The size between, if < Execute S56, if ≥ Execute S57.

[0063] S56: i = i + 1, return to execute S54.

[0064] Specifically, if < This indicates that the surplus photovoltaic power in the current system is insufficient to support the i-th smart load, so the smart load is not started. According to the priority order of the smart loads mentioned above, the start-up conditions of the (i+1)-th smart load are determined. S57: Start intelligent load i and return to execute S51.

[0065] Specifically, if ≥ This indicates that the surplus photovoltaic power in the current system can support the smart load, and the smart load is then activated through the photovoltaic-storage system. After the smart load is activated, the surplus photovoltaic power is recalculated and assessed.

[0066] S58: If If <0, iterate through the n smart loads in ascending order of preset priority, and stop the currently traversed smart load.

[0067] Specifically, when If the value is less than 0, it indicates that there is no surplus photovoltaic power in the system and that the grid connection point is purchasing electricity. According to the set priority of the smart loads, the priorities of the started smart loads are sorted from low to high, with the lowest priority smart load numbered 1, and so on. Following this order, the started smart loads are stopped one by one. Assuming that after stopping the i-th smart load, the amount of surplus photovoltaic power is determined.

[0068] by Figure 1Taking the structure shown as an example, assume there are two smart loads in the system, with smart load 1 having a higher preset priority than smart load 2. Smart load 1 has a rated power of 2kW, smart load 2 has a rated power of 2kW, a typical load is approximately 3kW, and the current maximum output power of the photovoltaic energy storage system is 6kW. Currently, all smart loads in the system are not activated.

[0069] In the maximum self-consumption mode, the photovoltaic and energy storage system prioritizes powering ordinary loads, and the power sensor at the grid connection point samples the grid-connected power. The power output is 3kW, therefore the current surplus photovoltaic power in the system is 3kW.

[0070] Because the system has surplus photovoltaic power, the inactive smart loads are sorted from highest to lowest priority according to the preset priority settings. The sorting result is: Smart Load 1, Smart Load 2. Based on the sorting results, first determine Smart Load 1, since... Then the photovoltaic storage system will start intelligent load 1.

[0071] After starting smart load 1, the surplus photovoltaic power is recalculated. The power sensor at the grid connection point samples a grid-connected power of 1kW. Therefore, the current surplus photovoltaic power in the system is 1kW.

[0072] Based on the priority settings mentioned above, the unactivated smart loads in the system are sorted from highest to lowest priority. The sorting result is: Smart Load 2.

[0073] Since there is residual photovoltaic power in the system, the activation conditions for smart loads are determined. The activation conditions for smart load 2 are then determined. Because the rated power of smart load 2 is greater than the residual photovoltaic power, smart load 2 is not activated.

[0074] by Figure 1 For example, suppose there are two smart loads in the system, with smart load 1 having a higher preset priority than smart load 2. Smart load 1 has a rated power of 5kW, smart load 2 has a rated power of 2kW, a normal load is about 3kW, and the current maximum output power of the photovoltaic energy storage system is 6kW. Currently, all smart loads in the system are not activated.

[0075] In the maximum self-consumption mode, the photovoltaic and energy storage system prioritizes powering ordinary loads, and the power sensor at the grid connection point samples the grid-connected power. The power output is 3kW, therefore the current surplus photovoltaic power in the system is 3kW.

[0076] Based on the priority settings mentioned above, the inactive smart loaders in the system are sorted from highest to lowest priority. The sorting result is: Smart Load 1, Smart Load 2. .

[0077] Since there is residual photovoltaic power in the system, the activation conditions of the smart load are determined. First, smart load 1 is checked. Since the rated power of smart load 1 is greater than the residual photovoltaic power, smart load 1 is not activated. The system then proceeds to check smart load 2.

[0078] The photovoltaic storage system starts intelligent load 2.

[0079] After starting Smart Load 2, the surplus photovoltaic power is recalculated. The power sensor at the grid connection point samples a grid-connected power of 1kW. Therefore, the current surplus photovoltaic power in the system is 1kW. .

[0080] Because there is residual photovoltaic power in the system, the inactive smart loads in the system are sorted from high to low according to the priority settings mentioned above. The sorting result is: Smart Load 1. Based on the sorting result, Smart Load 1 is judged first. If so, the photovoltaic storage system will not start the smart load 1.

[0081] by Figure 1 For example, suppose there are two smart loads in the system, with smart load 1 having a higher preset priority than smart load 2. Smart load 1 has a rated power of 2kW, smart load 2 has a rated power of 2kW, a typical load is approximately 3kW, and the current maximum output power of the photovoltaic energy storage system is 8kW. All smart loads in the system are currently activated.

[0082] Under maximum self-consumption mode, the photovoltaic and energy storage system prioritizes powering ordinary loads. The power sensor at the grid connection point samples a grid-connected power of 1kW. Therefore, the current surplus photovoltaic power in the system is 1kW. .

[0083] Furthermore, all smart loads have been started, and start-up and stop conditions are not being determined. As sunlight intensity decreases, the maximum output power of the photovoltaic-storage system drops to 6kW. The power sensor at the grid connection point samples a grid-connected power of -1kW, indicating that electricity is being purchased. The current surplus photovoltaic power in the system is -1kW. .

[0084] According to the preset priority of the smart load, the preset priority of the started smart load is sorted from low to high, and the sorting result is: smart load 2, smart load 1.

[0085] Based on the above sorting results, the photovoltaic-storage system first stops smart load 2. After stopping smart load 2, the residual photovoltaic power in the system is recalculated. The power sensor at the grid connection point samples a grid-connected power of 1kW, i.e. .

[0086] Based on a preset priority, the unactivated smart loads in the system are sorted from high to low. The sorting result is: Smart Load 2. Based on the sorting result, since the rated power of Smart Load 2 is greater than the surplus photovoltaic power, the photovoltaic-storage system will not activate Smart Load 2.

[0087] In some embodiments, in strategy 2, the photovoltaic surplus power, the preset priority of n smart loads, and the rated power of each smart load are considered. Controlling the start-up, operation, or shutdown of n intelligent loads includes the following steps 11 to 15: Step 11, when If the value is ≥0, iterate through the n smart loads that have not been started, in descending order of their preset priority.

[0088] Step 12: For the i-th unactivated smart load currently being traversed, calculate the target power. = + ,in, This represents the sum of the rated power of all smart loads that are in the active state but have a preset priority lower than the i-th non-activated smart load.

[0089] Step 13: Compare the rated power of the i-th unactivated smart load. With target power Size.

[0090] Step 14, if < If the i-th unstarted smart load is not started, continue iterating through the (i+1)-th unstarted smart load.

[0091] Step 15, if ≥ Start the i-th non-started smart load, and based on the updated active power at the grid connection point. Once new photovoltaic surplus power is identified, the process of traversing all inactive smart loads is repeated until all inactive smart loads have been traversed or updated. <0.

[0092] In some embodiments, the system is based on surplus photovoltaic power, the preset priority of n smart loads, and the rated power of each smart load. Controlling the start-up, operation, or shutdown of n intelligent loads also includes the following steps 16 to 19: Step 16, if <0, traverse the started smart loads among the n smart loads in order of preset priority from low to high; Step 17: For the i-th started smart load currently being traversed, control the i-th started smart load to stop running, and based on the updated active power at the grid connection point... Identify new surplus photovoltaic power: Step 18, if the updated If the value is ≥0, then stop traversing and do not stop other started smart workloads; Step 19, if the updated If <0, continue iterating through the (i+1)th started smart workload and stopping it, until the updated one is reached. ≥0.

[0093] Please see Figure 6 , Figure 6 A flowchart illustrating the load control method corresponding to Strategy 2 provided in this application embodiment is shown, specifically including: S61: Calculate surplus photovoltaic power.

[0094] Specifically, the active power measured by the power sensor at the grid connection point can be... As surplus electricity from photovoltaic power generation.

[0095] S62: Determine the amount of residual photovoltaic power; if... If ≥0, execute S63, if <0, execute S68.

[0096] S63: Sort the unstarted smart loads from high to low according to the preset priority, and compare the rated power of the unstarted smart loads with the photovoltaic surplus power in turn.

[0097] Specifically, when When the value is ≥0, it indicates that there is residual photovoltaic power in the system. According to the set priority of the smart loads, the priority of the unactivated smart loads is sorted from high to low, with the highest priority smart load numbered 1, and so on. Following the above sorting order, the rated power of the unactivated smart loads is compared with the residual photovoltaic power.

[0098] S64: Let the rated power of the i-th intelligent load be denoted as... .

[0099] S65: Calculate the target power for the i-th unactivated smart load currently being traversed. = + ,in, This represents the sum of the rated power of all smart loads that are in the active state but have a preset priority lower than the i-th non-activated smart load.

[0100] S66: If < , i = i + 1, return to execute S64.

[0101] S67: If ≥ Start the intelligent load i and return to execute S61.

[0102] S68: If If <0, iterate through the n smart loads in ascending order of preset priority, and stop the currently traversed smart load.

[0103] by Figure 1 For example, suppose there are two smart loads in the system, with smart load 1 having a higher priority than smart load 2. Smart load 1 has a rated power of 5kW, smart load 2 has a rated power of 2kW, a normal load is about 3kW, and the current maximum output power of the photovoltaic energy storage system is 6kW. Currently, all smart loads in the system are not activated.

[0104] Under maximum self-consumption mode, the photovoltaic and energy storage system prioritizes powering ordinary loads. The power sensor at the grid connection point samples a grid-connected power of 3kW. Therefore, the current surplus photovoltaic power in the system is 3kW. .

[0105] Based on the priority settings mentioned above, the inactive smart loaders in the system are sorted from highest to lowest priority. The sorting result is: Smart Load 1, Smart Load 2. .

[0106] Then, the activation conditions of the intelligent loads are determined, starting with intelligent load 1. Since all intelligent loads in the system are not yet activated, the sum of the rated power of all intelligent loads with lower priority than intelligent load 1 and already activated is 0. . If Smart Load 1 is not started, continue to determine Smart Load 2.

[0107] Similarly, . The photovoltaic storage system starts intelligent load 2.

[0108] After starting Smart Load 2, the surplus photovoltaic power is recalculated. The power sensor at the grid connection point samples a grid-connected power of 1kW. Therefore, the current surplus photovoltaic power in the system is 1kW. .

[0109] Based on the priority settings mentioned above, the unactivated smart loads in the system are sorted from highest to lowest. The sorting result is: Smart Load 1. Based on the sorting result, Smart Load 1 is determined. At this point, the sum of the rated power of all smart loads with a priority lower than Smart Load 1 and already activated is equal to the rated power of Smart Load 2, 2kW. . Do not start Smart Load 1.

[0110] As sunlight intensity increases, the maximum output power of the photovoltaic-storage system is currently 9kW. At this point, the power sensor at the grid connection point samples a grid-connected power of 4kW. Therefore, the current surplus photovoltaic power in the system is 4kW, i.e. .

[0111] Based on the priority settings mentioned above, the unactivated smart loads in the system are sorted from highest to lowest priority. The sorting result is: Smart Load 1.

[0112] Currently, the system has activated intelligent load 2. The sum of the rated power of all intelligent loads that have been activated and have a lower priority than intelligent load 1 is equal to the rated power of intelligent load 2, which is 2kW. .at this time The photovoltaic storage system starts intelligent load 1.

[0113] After starting smart load 1, the residual photovoltaic power is recalculated. The power sensor at the grid connection point samples a grid-connected power of -1kW. Therefore, the current residual photovoltaic power in the system is -1kW, i.e. .

[0114] According to the set priority of the smart loaders, the priority of the started smart loaders is sorted from low to high, and the sorting result is: smart load 2, smart load 1.

[0115] Based on the above sorting results, the photovoltaic-storage system first stops smart load 2. After stopping smart load 2, the residual photovoltaic power in the system is recalculated. The power sensor at the grid connection point samples a grid-connected power of 1kW, i.e. .

[0116] Based on the set priority, the inactive smart loaders in the system are sorted from high to low. The sorting result is: Smart Load 2. Based on the sorting result, Smart Load 2 is then determined. At this point... If so, the photovoltaic storage system will not start the smart load 2.

[0117] The difference between Strategy 1 and Strategy 2 is that, assuming several smart loads are already in operation in the system, one smart load remains inactive, and the priority of the activated smart loads is lower than that of the inactive smart load. The current surplus photovoltaic power in the system is less than the rated power of the smart load, while the sum of the rated power of the activated smart loads and the sum of the surplus photovoltaic power exceeds the rated power of the smart load.

[0118] When using strategy 1 for control, this smart load will not be started.

[0119] When applying strategy 2 for control, the smart load is activated. After the smart load is activated, the grid connection point experiences electricity purchases. Based on the priority of the smart loads already activated in the system, they are sorted from low to high and switched off sequentially until the residual photovoltaic power in the system is greater than or equal to zero.

[0120] This application provides the method for obtaining the active power at the grid connection point. And based on the active power at the grid connection point Determine the surplus photovoltaic power of the photovoltaic-storage system, wherein the direction of power flow into the grid is: The positive direction; based on photovoltaic surplus power, the preset priority of n smart loads, and the rated power of each smart load. It controls the start-up or shutdown of n intelligent workloads according to preset rules, where i is a positive integer. This represents the rated power of the i-th smart load. The preset rules include: when the photovoltaic surplus power is greater than 0, priority is given to starting high-priority smart loads; when the photovoltaic surplus power is less than 0, priority is given to stopping low-priority smart loads. This scheme utilizes the real-time status of the photovoltaic surplus power as a basis for judgment. When photovoltaic power generation is sufficient, priority is given to activating high-priority smart loads to increase user-side electricity consumption and the proportion of photovoltaic self-consumption; when photovoltaic power generation is insufficient, priority is given to cutting off low-priority smart loads to reduce electricity purchases from the grid. This provides a control scheme for smart loads in a photovoltaic-storage system, thereby achieving the technical effect of significantly improving the self-consumption rate of the photovoltaic-storage system and maximizing the benefits of photovoltaic power generation.

[0121] Figure 7 This is a schematic diagram of a load control device provided for an exemplary embodiment of this application; the device is applied to a photovoltaic energy storage system, which is connected to the power grid and n smart loads respectively, where n is a positive integer ≥1. The inverter output terminal of the photovoltaic energy storage system is provided with a grid connection point between the inverter and the power grid, and the smart loads establish communication with the photovoltaic energy storage system. The device includes: Acquisition unit 71 is used to acquire the active power at the grid connection point of the photovoltaic-storage system. and the active power of the grid connection point The surplus photovoltaic power identified is from the photovoltaic-storage system, with the direction of power flowing into the grid being: The positive direction; Control unit 72 is used to determine the power based on photovoltaic surplus electricity, the preset priorities of n smart loads, and the rated power of each smart load. It controls the start-up or shutdown of n intelligent workloads according to preset rules, where i is a positive integer. This represents the rated power of the i-th smart load. The preset rules include: when the photovoltaic surplus power is greater than 0, the smart load with higher preset priority is started first; when the photovoltaic surplus power is less than 0, the smart load with lower preset priority is stopped first.

[0122] In some embodiments, the device is used for the preset priority of n smart loads based on photovoltaic surplus power, and the rated power of each smart load. When controlling the start-up, operation, or shutdown of n intelligent loads, it is specifically used for: when If the value is ≥0, then iterate through the n smart loads that have not been started, in descending order of their preset priority. For the i-th unstarted smart load encountered in the current iteration, compare its rated power. With photovoltaic surplus power Size: like < If the i-th unstarted smart load is not started, continue iterating through the (i+1)-th unstarted smart load; like ≥ Then, the i-th non-started smart load is started, based on the updated active power at the grid connection point. Once the new photovoltaic surplus power is identified, the process of traversing the unstarted smart loads is repeated.

[0123] In some embodiments, the device is used for the preset priority of n smart loads based on photovoltaic surplus power, and the rated power of each smart load. When controlling the start-up, operation, or shutdown of n intelligent loads, it is also used for: like <0, traverse the started smart loads among the n smart loads in order of preset priority from low to high; For the i-th smart load that has been started during the current iteration, control the i-th smart load to stop running, and based on the updated active power at the grid connection point. Identify new surplus photovoltaic power: If the updated If the value is ≥0, then stop traversing and do not stop other started smart workloads; If the updated If <0, continue iterating through the (i+1)th started smart workload and stopping it, until the updated one is reached. ≥0.

[0124] In some embodiments, the device is used for the preset priority of n smart loads based on photovoltaic surplus power, and the rated power of each smart load. When controlling the start-up, operation, or shutdown of n intelligent loads, it is specifically used for: when If the value is ≥0, then iterate through the n smart loads that have not been started, in descending order of their preset priority. Calculate the target power for the i-th unactivated smart load encountered during the current iteration. = + ,in, This represents the sum of the rated power of all smart loads that are in the active state but have a preset priority lower than the i-th non-activated smart load among the n smart loads; Compare the rated power of the i-th unactivated smart load. With target power Size: like < If the i-th unstarted smart load is not started, continue iterating through the (i+1)-th unstarted smart load; like ≥ Start the i-th non-started smart load, and based on the updated active power at the grid connection point. Once new photovoltaic surplus power is identified, the process of traversing all inactive smart loads is repeated until all inactive smart loads have been traversed or updated. <0.

[0125] In some embodiments, the device is used for the preset priority of n smart loads based on photovoltaic surplus power, and the rated power of each smart load. When controlling the start-up, operation, or shutdown of n intelligent loads, it is also used for: like <0, traverse the started smart loads among the n smart loads in order of preset priority from low to high; For the i-th smart load that has been started during the current iteration, control the i-th smart load to stop running, and based on the updated active power at the grid connection point. Identify new surplus photovoltaic power: If the updated If the value is ≥0, then stop traversing and do not stop other started smart workloads; If the updated If <0, continue iterating through the (i+1)th started smart workload and stopping it, until the updated one is reached. ≥0.

[0126] In some embodiments, the device is used to acquire the active power at the grid connection point of the photovoltaic system. When, specifically used for: By installing power sensors at the grid connection point, the active power at the grid connection point is collected, and the collected active power is determined as the grid connection point active power of the photovoltaic system. .

[0127] In some embodiments, the smart load is communicatively connected to the optical storage system and controlled by the optical storage system to perform startup or shutdown, wherein the smart load achieves control in one of the following ways: The intelligent load integrates a communication and control module, which is used to receive and execute start and stop commands from the optical storage system; A smart switch is connected in series in the power supply circuit of the smart load. The photovoltaic energy storage system indirectly controls the start and stop of the smart load by controlling the on and off of the smart switch.

[0128] In some embodiments, the photovoltaic energy storage system is also connected to ordinary loads, which have the highest priority, and the photovoltaic energy storage system prioritizes supplying power to ordinary loads.

[0129] It should be understood that the device embodiments and method embodiments can correspond to each other, and similar descriptions can be referred to the method embodiments. To avoid repetition, they will not be repeated here. Specifically, the device can execute the above method embodiments, and the foregoing and other operations and / or functions of each module in the device correspond to the corresponding processes in the various methods in the above method embodiments, which will not be repeated here for the sake of brevity.

[0130] The apparatus of this application embodiment has been described above from the perspective of functional modules in conjunction with the accompanying drawings. It should be understood that this functional module can be implemented in hardware, in software instructions, or in a combination of hardware and software modules. Specifically, the steps of the method embodiments in this application can be completed by integrated logic circuits in the processor's hardware and / or by software instructions. The steps of the method disclosed in this application embodiment can be directly embodied as being executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. Optionally, the software module can reside in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps in the above method embodiments.

[0131] Figure 8 This is a schematic block diagram of an electronic device provided in an embodiment of this application. The electronic device may include: The system includes a memory 801 and a processor 802. The memory 801 stores computer programs and transfers the program code to the processor 802. In other words, the processor 802 can retrieve and run the computer programs from the memory 801 to implement the methods described in the embodiments of this application.

[0132] For example, the processor 802 can be used to execute the above-described method embodiments according to instructions in the computer program.

[0133] In some embodiments of this application, the processor 802 may include, but is not limited to: General-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0134] In some embodiments of this application, the memory 801 includes, but is not limited to: Volatile memory and / or non-volatile memory. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

[0135] In some embodiments of this application, the computer program may be divided into one or more modules, which are stored in the memory 801 and executed by the processor 802 to perform the method provided in this application. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the electronic device.

[0136] like Figure 8 As shown, the electronic device may also include: Transceiver 803, which may be connected to processor 802 or memory 801.

[0137] The processor 802 can control the transceiver 803 to communicate with other devices; specifically, it can send information or data to other devices or receive information or data sent by other devices. The transceiver 803 may include a transmitter and a receiver. The transceiver 803 may further include antennas, and the number of antennas may be one or more.

[0138] It should be understood that the various components in the electronic device are connected through a bus system, which includes a data bus, a power bus, a control bus, and a status signal bus.

[0139] This application also provides a computer storage medium storing a computer program thereon, which, when executed by a computer, enables the computer to perform the methods of the above-described method embodiments. Alternatively, embodiments of this application also provide a computer program product containing instructions that, when executed by a computer, cause the computer to perform the methods of the above-described method embodiments.

[0140] When implemented using software, it can be implemented entirely or partially as a computer program product. This computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital video disc (DVD)), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0141] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0142] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0143] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. For example, the functional modules in the various embodiments of this application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0144] In the embodiments of this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0145] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A load control method, characterized in that, The method is applied to a photovoltaic-storage system, wherein the photovoltaic-storage system is connected to the power grid and n smart loads, where n is a positive integer ≥ 1. The inverter output of the photovoltaic-storage system has a grid connection point with the power grid. The smart loads establish communication with the photovoltaic-storage system. The method includes: Obtain the active power at the grid connection point. And based on the active power of the grid connection point The surplus photovoltaic power of the photovoltaic-storage system is determined, wherein the direction of power flowing into the power grid is as follows: The positive direction; Based on the photovoltaic surplus power, the preset priorities of the n smart loads, and the rated power of each smart load. The system controls the start-up or shutdown of the n intelligent loads according to preset rules, where i is a positive integer. The rated power of the i-th smart load is represented by the preset rule, which includes: when the photovoltaic residual power is greater than 0, the smart load with higher preset priority is started first; when the photovoltaic residual power is less than 0, the smart load with lower preset priority is stopped first.

2. The method according to claim 1, characterized in that, The system is based on the surplus photovoltaic power, the preset priority of the n smart loads, and the rated power of each smart load. Controlling the start-up or shutdown of the n intelligent loads includes: when If the value is ≥0, then the unactivated smart loads among the n smart loads are traversed in descending order of preset priority. For the i-th unstarted smart load encountered in the current iteration, compare its rated power. With the photovoltaic surplus power Size: like < If the i-th unstarted smart load is not started, continue iterating through the (i+1)-th unstarted smart load; like ≥ Then, the i-th non-started smart load is started, based on the updated active power of the grid connection point. Once the new photovoltaic surplus power is determined, the steps of traversing the unactivated smart loads are executed again.

3. The method according to claim 2, characterized in that, The system is based on the surplus photovoltaic power, the preset priority of the n smart loads, and the rated power of each smart load. Controlling the start-up or shutdown of the n intelligent loads also includes: like <0, traverse the started smart loads among the n smart loads in ascending order of preset priority; For the i-th started smart load currently being traversed, control the i-th started smart load to stop running, and based on the updated active power of the grid connection point... Identify new surplus photovoltaic power: If the updated If the value is ≥0, then stop traversing and do not stop other started smart workloads; If the updated If <0, continue iterating through the (i+1)th started smart workload and stopping it, until the updated one is reached. ≥0.

4. The method according to claim 1, characterized in that, Based on the photovoltaic surplus power, the preset priorities of the n smart loads, and the rated power of each smart load. Controlling the start-up or shutdown of the n intelligent loads includes: when If the value is ≥0, then the unactivated smart loads among the n smart loads are traversed in descending order of preset priority. Calculate the target power for the i-th unactivated smart load encountered during the current iteration. = + ,in, This represents the sum of the rated power of all smart loads among the n smart loads whose preset priority is lower than that of the i-th non-activated smart load and which are in the activated state; Compare the rated power of the i-th unactivated smart load. With target power Size: like < If the i-th unstarted smart load is not started, the process continues to iterate through the (i+1)-th unstarted smart load. like ≥ Start the i-th non-started smart load, and based on the updated active power of the grid connection point. Once new photovoltaic surplus power is identified, the process of traversing all inactive smart loads is repeated until all inactive smart loads have been traversed or updated. <0.

5. The method according to claim 4, characterized in that, Based on the photovoltaic surplus power, the preset priorities of the n smart loads, and the rated power of each smart load. Controlling the start-up or shutdown of the n intelligent loads also includes: like <0, traverse the started smart loads among the n smart loads in ascending order of preset priority; For the i-th started smart load currently being traversed, control the i-th started smart load to stop running, and based on the updated active power of the grid connection point... Identify new surplus photovoltaic power: If the updated If the value is ≥0, then stop traversing and do not stop other started smart workloads; If the updated If <0, continue iterating through the (i+1)th started smart workload and stopping it, until the updated one is reached. ≥0.

6. The method according to claim 1, characterized in that, The active power at the grid connection point of the photovoltaic system is obtained. ,include: The active power at the grid connection point is collected by a power sensor installed at the grid connection point, and the collected active power is determined as the grid connection point active power of the photovoltaic system. .

7. The method according to claim 1, characterized in that, The intelligent load is communicatively connected to the optical storage system and is controlled by the optical storage system to perform startup or shutdown, wherein the intelligent load achieves control through one of the following methods: The intelligent load integrates a communication and control module, which is used to receive and execute start and stop commands from the optical storage system. A smart switch is connected in series in the power supply circuit of the smart load, and the photovoltaic energy storage system indirectly controls the start and stop of the smart load by controlling the on and off of the smart switch.

8. The method according to claim 1, characterized in that, The photovoltaic energy storage system is also connected to ordinary loads, which have the highest priority, and the photovoltaic energy storage system prioritizes supplying power to the ordinary loads.

9. A load control device, characterized in that, The device is applied to a photovoltaic-storage system, which is connected to the power grid and n smart loads, where n is a positive integer ≥ 1. The inverter output of the photovoltaic-storage system has a grid connection point with the power grid. The smart loads establish communication with the photovoltaic-storage system. The device includes: The acquisition unit is used to acquire the active power at the grid connection point of the photovoltaic-storage system. and the active power of the grid connection point The surplus photovoltaic power from the photovoltaic-storage system is identified as follows: the direction of power flow into the power grid is... The positive direction; The control unit is configured to, based on the surplus photovoltaic power, the preset priorities of the n smart loads, and the rated power of each smart load,... The system controls the start-up or shutdown of the n intelligent loads according to preset rules, where i is a positive integer. The rated power of the i-th smart load is represented by the preset rule, which includes: when the photovoltaic residual power is greater than 0, the smart load with higher preset priority is started first; when the photovoltaic residual power is less than 0, the smart load with lower preset priority is stopped first.

10. An electronic device, characterized in that, include: processor; as well as Memory for storing the executable instructions of the processor; The processor is configured to execute the method of any one of claims 1-8 by executing the executable instructions.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1-8.

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