Power management method and device, energy management device, and energy system

Abstract

The present application relates to a power management method, a power management device (10), an energy management device (70), an energy system (100), and a storage medium (300). The power management method includes the steps of acquiring a first generated power of a first power generation device (30) and a power consumption of a load (200), and controlling an energy storage device (50) to store power when the first generated power is greater than the power consumption, and outputting the amount of power stored in the energy storage device (50) to a power grid (400) during a power selling period based on a determined power selling period.

Description

[Technical Field]

[0001] This application claims priority to and benefits from patent application number "202310970743.0" filed with the State Intellectual Property Office of China on August 2, 2023, and patent application number "202310979971.4" filed with the State Intellectual Property Office of China on August 3, 2023, the entire texts of which are incorporated herein by reference.

[0002] The present application relates to the technical field of energy management, and more particularly to a power management method, a power management apparatus, an energy management apparatus, an energy system, and a non-volatile computer-readable storage medium. [Background technology]

[0003] With the development and growth of new energy sources, many households no longer rely on the public power grid for power supply, but instead choose to use new energy sources for their household power supply, such as solar power generation, wind power generation, tidal power generation, etc. However, when new energy sources are used to supply power to households to meet the power needs of household appliances, the excess electricity produced by the new energy sources is either wasted or purchased from the public power grid at a low price. However, if the new energy sources cannot meet the power needs of household appliances, the electricity must be repurchased from the public power grid at a high price, which increases household electricity costs. Summary of the Invention

[0004] SUMMARY OF THE INVENTION Embodiments of the present application provide a power management method, a power management apparatus, an energy management apparatus, an energy system, and a non-volatile computer-readable storage medium.

[0005] A power management method according to an embodiment of the present application is applied to an energy system including a first power generation device, a power distribution device, and an energy storage device, and the power distribution device connects the first power generation device that supplies power to the power distribution device, the energy storage device, and one or more loads, and the power management method includes the steps of: acquiring a first generated power of the first power generation device and a power consumption of the one or more loads; controlling the energy storage device to store power when the first generated power is greater than the power consumption; determining a power selling period based on a predetermined power selling price curve, the power selling price curve including a plurality of electricity price periods, and the power selling period being an electricity price period among the plurality of electricity price periods in which a ranking of electricity prices based on the power selling price satisfies a predetermined ranking; and outputting the amount of power of the energy storage device to a power grid during the power selling period, and making the remaining amount of power of the energy storage device after the output to the power grid greater than a first predetermined amount of power.

[0006] A power management device according to an embodiment of the present application is applied to an energy system including a first power generation device, a power distribution device, and an energy storage device, wherein the power distribution device connects the first power generation device, the energy storage device, and one or more loads, the first power generation device supplies power to the power distribution device, and the power management device includes a first acquisition module and a first control module. The first acquisition module is used to acquire the first generated power of the first power generation device and the power consumption of the one or more loads, the first control module is used to control the energy storage device to store power when the first generated power is greater than the power consumption, the first determination module is used to determine a power selling period based on a predetermined power selling price curve, the power selling price curve includes a plurality of electricity price periods, and the power selling period is an electricity price period among the plurality of electricity price periods in which the ranking of electricity prices based on the power selling price satisfies the predetermined ranking, and the trading module is used to output the amount of power of the energy storage device to the power grid during the power selling period and make the remaining amount of power of the energy storage device after output to the power grid greater than the first predetermined amount of power.

[0007] An energy management device according to an embodiment of the present application includes a processor and a memory that stores a computer program that, when executed by the processor, realizes steps of the power management method. The power management method includes the steps of: acquiring a first generated power of the first power generation device and a power consumption of the one or more loads; controlling the energy storage device to store power when the first generated power is greater than the power consumption; determining a power selling period based on a predetermined power selling price curve, the power selling price curve including a plurality of electricity price periods, and determining the power selling period as a power price period among the plurality of electricity price periods in which a ranking of electricity prices based on the power selling price satisfies a predetermined ranking; and outputting an amount of power from the energy storage device to a power grid during the power selling period and making a remaining amount of power in the energy storage device after the output to the power grid greater than a first predetermined amount of power.

[0008] An energy system according to an embodiment of the present application includes a first power generation device, a power distribution device, an energy storage device, and the above-mentioned energy management device, wherein the energy management device connects the first power generation device, the power distribution device, and the energy storage device, and the power distribution device connects the first power generation device, the energy storage device, and one or more loads.

[0009] A non-volatile computer-readable storage medium according to an embodiment of the present application stores a computer program that, when executed by a processor, enables the processor to execute the power management method, the power management method including the steps of: acquiring a first generated power of the first power generation device and power consumption of the one or more loads; controlling the energy storage device to store power when the first generated power is greater than the power consumption; determining a power selling period based on a predetermined power selling price curve, the power selling price curve including a plurality of electricity price periods, the power selling period being a power price that satisfies a predetermined ranking according to the power selling price; and outputting an amount of power from the energy storage device to a power grid during the power selling period and setting a remaining amount of power in the energy storage device after the output to the power grid to be greater than a first predetermined amount of power.

[0010] The power management method, power management device, energy management device, energy system, and non-volatile computer-readable storage medium according to the embodiments of the present application are applicable to an energy system, and the energy system includes a first power generation device, a power distribution device, and an energy storage device. The power distribution device is connected to the first power generation device so that the first power generation device can supply power to the power distribution device, and the power distribution device is further connected to an energy storage device and one or more loads so that the power generated from the first power generation device can be transmitted to the energy storage device and the loads. This allows the first power generation of the first power generation device and the power consumption of the one or more loads to be obtained, and further allows the power energy generated from the first power generation device to be known as being able to meet the demand of the loads. Even when the first power generation power of the first power generation device is greater than the power consumption of the load, i.e., when the power generated by the first power generation device satisfies the power consumption of the load, surplus power exists, and at this time the energy storage device can be controlled to store power (such as by adjusting the input power of the energy storage device), the surplus power generated by the first power generation device can be stored in the energy storage device, and the power sales prices for multiple power price periods can be ranked based on a predetermined power sales price curve, and in a power price period in which the ranking of the power sales prices meets the predetermined ranking, the energy storage device can output an amount of power greater than the first predetermined amount of power to the public power grid.In an energy system that does not increase the energy storage device, the surplus power of the first power generation device is wasted or purchased cheaply by the public power grid.Compared to this, the energy storage device ensures that the power generated by the first power generation device is as self-sufficient as possible while minimizing consumption of power from the public power grid, thereby reducing household electricity costs.

[0011] Additional aspects and advantages of the embodiments of the present application will be set forth in part in the description that follows, and in part will be apparent from the description, or may be learned through the embodiments of the present application.

[0012] The above and / or additional aspects and advantages of the present application will become apparent and easier to understand from the following description of the embodiments in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 2] FIG. 1 is a plan view schematic diagram of an energy system according to some embodiments of the present application. [Figure 3] FIG. 2 is a schematic diagram of a power generation curve and a power consumption curve according to some embodiments of the present application. [Figure 4] FIG. 2 is a schematic diagram of an electricity selling price curve and an electricity consumption price curve according to some embodiments of the present application. [Figure 5] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 6] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 7] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 8] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 9] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 10] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 11] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 12] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 13] 1 is a schematic diagram illustrating the flow of a power management method according to some embodiments of the present application; [Figure 14] FIG. 2 is a schematic diagram illustrating modules of a power management unit according to some embodiments of the present application. [Figure 15] FIG. 2 is a schematic diagram illustrating the connection state of a non-volatile computer-readable storage medium and a processor in some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0014]

[0023] The following detailed description will be given of the embodiments of the present application shown in the accompanying drawings, in which the same or similar reference numerals throughout indicate the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary, used only to describe the embodiments of the present application, and are not to be understood as limiting the embodiments of the present application.

[0015] 1 to 4, a power management method according to an embodiment of the present application is applied to an energy system 100 including a first power generation device 30, a power distribution device 40, and an energy storage device 50, wherein the power distribution device 40 connects the first power generation device 30, the energy storage device 50, and one or more loads 200, and the first power generation device 30 supplies power to the power distribution device 40, and the power management method includes the following steps:

[0016] In step 011, the first generated power of the first power generating device 30 and the power consumption of one or more loads 200 are obtained.

[0017] Among them, the energy system 100 includes a first power generation device 30, a power distribution device 40, an energy storage device 50, and an energy management device 70. The first power generation device 30 may be a device that generates electricity using primary renewable energy, such as a solar power generation device or a wind power generation device, and the number of first power generation devices 30 may be multiple (for example, the number of first power generation devices 30 may be one, two, etc.), and they may be arranged according to actual demand, but this is not limited thereto.

[0018] The power distribution device 40 may be a receptacle, a plug, an air switch, etc., and the number of the power distribution device 40 may be one or more, but is not limited thereto.

[0019] The energy storage device 50 may be an energy storage facility or other facility that can be charged and discharged. For example, the energy storage device 50 may be a battery-type energy storage device, a capacitive energy storage device, etc., and the number of energy storage devices 50 may be one or more, but is not limited thereto.

[0020] The energy management device 70 (Energy Management System, EMS) includes a processor 71 connectable to the power distribution device 40 for communicating with the power distribution device 40, and a memory 72.

[0021] Specifically, by connecting the power distribution device 40 to the first power generation device 30 and allowing the first power generation device 30 to supply power to the power distribution device 40, the power distribution device 40 can collect the first generated power of the first power generation device 30 in real time.

[0022] Alternatively, since the location of the first power generating device 30 is fixed and the weather and other conditions are similar, the change in the first generated power in the near future is also similar. Each day can be divided into a plurality of power consumption periods (for example, 12, 24, 48, etc., and the greater the number of divided periods, the higher the accuracy of the predicted first generated power, and it can be understood that each time can be treated as one power consumption period), and the first power generating device 30 has a first generated power corresponding to each power consumption period, and the first generated power in the current power consumption period can be predicted using the first generated power collected within a predetermined time in the past (for example, within one week, one month, etc.).

[0023] For example, after obtaining the first generated power for the past week, the first generated power for the first power consumption period for each day of the week can be set as the average value of the first generated power for the first power consumption period for that day, and based on the first generated power for the first power consumption period for each day of the week, the first generated power for the first power consumption period for that day can be predicted, thereby realizing prediction of the first generated power for each power consumption period.

[0024] By connecting the power distribution device 40 to the energy storage device 50, the electrical energy generated by the first power generation device 30 can flow into the energy storage device 50 via the power distribution device 40, thereby allowing the power distribution device 40 to collect the input power of the energy storage device 50, each of which has a corresponding input power for each power consumption period. The input power collected during a predetermined time in the past (e.g., within one week, within one month, etc.) can be used to predict how the input power will be collected in the current power consumption period, or the processor 71 can obtain the input power of the energy storage device 50 by collecting the input power in real time during the current power consumption period.

[0025] The load 200 may be a home appliance or a device that can consume electrical energy, such as a washing machine, a light, etc. By connecting the power distribution device 40 to one or more loads 200, the electrical energy generated by the first power generation device 30 can flow into the load 200 through the power distribution device 40. This allows the power distribution device 40 to collect the power consumption of the load 200, each of which has a corresponding power consumption for each power consumption period, and create a power consumption curve S1. The power consumption in the current power consumption period can be predicted based on the power consumption collected during a predetermined period in the past (e.g., within one week, within one month, etc.). Alternatively, the power distribution device 40 can collect the power consumption in real time during the current power consumption period, allowing the processor 71 to obtain the power consumption of the load 200.

[0026] In step 012, if the first generated power is greater than the consumed power, the energy storage device 50 is controlled to store power.

[0027] Specifically, the processor 71 acquires the first generated power and the consumed power, and then compares the first generated power with the consumed power. If the first generated power is greater than the consumed power, the processor 71 controls the energy storage device 50 to store power. For example, by adjusting the input power of the energy storage device 50, if the power consumption of the load 200 is met, the processor 71 causes the first power generation device 30 to generate excess current, which flows into the energy storage device 50 and is stored.

[0028] Specifically, the input power can be adjusted so that the difference between the first generated power and the full load power (i.e., the sum of the input power and the consumed power, and the energy storage device 50 at this time is the load 200) is equal to or less than a preset threshold (the preset threshold is an empirical value that can be determined according to electrical losses, such as 50 W, 100 W, etc.). For example, if the magnitude of the first generated power is 10,000 W and the consumed power of the load 200 is 5,000 W, the input power of the energy storage device 50 can be adjusted to 4,950 W to 5,000 W by setting the preset threshold to 50 W.

[0029] In step 013, a power selling period is determined based on a predetermined power selling price curve S3 including a plurality of power price periods, and the power selling period is an electricity price period among the plurality of power price periods in which the ranking of the power prices based on the power selling price satisfies the predetermined ranking.

[0030] Here, the electricity selling price is the price of the amount of electricity that the public power grid 400 purchases from the power generation unit, and the electricity selling price curve S3 is a curve consisting of electricity selling prices for different electricity consumption periods, and the electricity selling prices for different electricity consumption periods do not have to be the same.

[0031] Specifically, the predetermined power selling price curve S3 can be predicted based on past power selling prices. Because power consumption conditions differ between business days and weekends, separate predictions are required. For example, the power selling prices for the three or five weekends prior to the current weekend can be obtained, and the power selling prices for each electricity price period for the current weekend can be calculated by taking the average value of the corresponding electricity price periods for the three previous weekends as the power selling price for the corresponding electricity price period for the current weekend, and the power selling price curve S3 for the current weekend can be plotted. The power selling prices for each electricity price period for the current business day can be calculated by taking the average value of the corresponding electricity price periods for the three previous business days as the power selling price for the corresponding electricity price period for the current business day, and the power selling price curve S3 for the current business day can be plotted.

[0032] The memory 72 can store a preset electricity selling price curve S3, and the processor 71 can determine an electricity selling period when the energy system 100 is in an on-grid state based on the preset electricity selling price curve S3. For example, the processor 71 can rank the electricity selling prices of the multiple electricity price periods included in the electricity selling price curve S3 from lowest to highest, and then determine the electricity price period with a higher ranking than the preset ranking as the electricity selling period.

[0033] For example, the processor 71 divides 24 hours into 12 electricity price periods, each of which includes 2 hours, and sets the average value of the electricity selling prices for the 2 hours as the electricity selling price for the current electricity price period. The processor 71 ranks the electricity selling prices for the 12 electricity price periods from lowest to highest, and if the preset ranking is set to second, the processor 71 can determine that the electricity selling period is first among the 12 electricity price period rankings, or if the preset ranking is set to third, the processor 71 can determine that the electricity selling period is first and second among the 12 electricity price period rankings.

[0034] Alternatively, if the current electricity price period has passed the highest electricity selling period of the day, the processor 71 may set the highest-ranked electricity price period among the remaining electricity price periods as the electricity selling period, and for example, if the electricity price period of the day is at 8:00 p.m., the processor 71 may sell electricity at the highest price, but if the current electricity price period is at 10:00 p.m. and the amount of electricity in the energy storage device 50 is large at that time and needs to be sold, the processor 71 may set the highest-ranked electricity price period among the remaining electricity price periods as the electricity selling period and sell electricity.

[0035] In step 014, the amount of power stored in the energy storage device 50 is output to the power grid 400 during the power selling period, and the remaining amount of power stored in the energy storage device 50 after the output to the power grid 400 is set to be greater than the first preset amount of power.

[0036] After determining the power selling period for multiple electricity price periods, the processor 71 enables the amount of electricity stored in the energy storage device 50 during the power selling period to be sold to the public power grid 400, and makes the remaining amount of electricity in the energy storage device 50 after the power selling larger than a first preset amount of electricity (e.g., 50%, 70%, etc.) determined from the difference between the amount of electricity required to operate the target load 200 (for example, the load 200 that requires continuous operation is set as the target load 200) for a specified time (e.g., 1 hour, 2 hours, etc.) and the amount of electricity generated by the first power generation device 30 for the specified time.

[0037] In this way, by applying the power management method to the energy system 100, the energy system 100 includes a first power generation device 30, a power distribution device 40, and an energy storage device 50, and connects the power distribution device 40 to the first power generation device 30 so that the first power generation device 30 can supply power to the power distribution device 40, and further connects the power distribution device 40 to the energy storage device 50 and one or more loads 200 so that the power generated from the first power generation device 30 can be transported to the energy storage device 50 and the loads 200, thereby obtaining the first generated power of the first power generation device 30 and the power consumption of the loads 200, and further knowing whether the power energy generated from the first power generation device 30 can meet the demand of the loads 200. When the first generated power of the first power generating device 30 is greater than the power consumption of the load 200, i.e., when the power generated by the first power generating device 30 satisfies the power consumption of the load 200, surplus power still exists. At this time, the energy storage device 50 can be controlled to store power (for example, by adjusting the input power of the energy storage device 50), and the surplus power generated by the first power generating device 30 can be stored in the energy storage device 50. Furthermore, the power selling prices of a plurality of power price periods can be ranked based on the predetermined power selling price curve S3, and the ranking of the power selling prices can be determined based on the predetermined power selling price curve S3. In an energy system 100 in which the energy storage device 50 can sell an amount of electricity greater than the first preset amount of electricity during a period when the electricity price is greater than the set ranking, and the energy storage device 50 does not increase the energy storage device 50, the surplus electricity of the first power generation device 30 is wasted or purchased cheaply from the public power grid 400. In comparison, the energy storage device 50 ensures that the electricity generated by the first power generation device 30 is as self-sufficient as possible while minimizing the consumption of electricity from the public power grid 400, thereby reducing the electricity costs of the household.

[0038] Referring to FIG. 5, in some embodiments, determining the power selling period based on the preset power selling price curve S3 in step 013 includes the following steps.

[0039] In step 0131, a predicted time required for the energy storage device 50 to be fully charged is determined based on the first generated power in each power consumption period, the power consumption in each power consumption period, and the remaining power of the energy storage device 50.

[0040] In step 0132, the power selling period is determined based on the power selling price curve S3 within the predicted time.

[0041] Specifically, the power distribution device 40 can collect the first generated power of the first power generation device 30 in each power consumption period, the power consumed by the load 200 in each power consumption period, and the remaining power of the energy storage device 50. The processor 71 then calculates the difference between the first generated power and the power consumed in each power consumption period and determines the input power of the energy storage device 50 in each power consumption period. The processor 71 can then calculate the amount of power required to fully charge the energy storage device 50 based on the calculated remaining power of the energy storage device 50. Finally, the processor 71 can determine the predicted time required to fully charge the energy storage device 50 from the amount of power required to fully charge the energy storage device 50 and the input power in each power consumption period. For example, if the input power in each power consumption period is 5 kW and the amount of power required to fully charge the energy storage device 50 is 20 kWh, the predicted time is calculated as 20 kWh / 5 kW=4 hours, i.e., the energy storage device 50 will be fully charged after 4 hours.

[0042] After the prediction time is determined, it is necessary to sell power within the prediction time to prevent wastage of power. The processor 71 can determine an electricity price period within the prediction time based on the electricity selling price curve S3 within the prediction time, for example, including three electricity price periods, rank the electricity selling prices within the prediction time from lowest to highest, and select an electricity price period with a higher ranking than the preset ranking as the electricity selling period. For example, if the preset ranking is second, the electricity price period with the first ranking among the three electricity price periods is determined as the electricity selling period.

[0043] In this way, the predicted time required for the energy storage device 50 to be fully charged is determined from the first generated power in each power consumption period, the power consumption in each power consumption period, and the remaining power in the energy storage device 50, and the power selling period is determined based on the power selling price curve S3 at the predicted time.This makes it possible to prevent waste of power generation caused by the first power generation device 30 continuing to generate power even after the energy storage device 50 is fully charged, and improves the user's profits.

[0044] Referring again to FIGS. 4 and 6, in some embodiments, the power management method further includes the following steps.

[0045] In step 015, a target electricity consumption price is determined based on the preset electricity consumption price curve S4.

[0046] In step 016, a target power selling period in which the power selling price is higher than the target electricity consumption price is determined from among the power selling periods.

[0047] The step of outputting the amount of power of the energy storage device 50 to the power grid 400 during the power selling period in step 014 and making the remaining amount of power of the energy storage device 50 after the output to the power grid 400 greater than the first preset amount of power includes the following steps.

[0048] In step 0141, the amount of power stored in the energy storage device 50 is output to the power grid 400 during the target power selling period, and the remaining amount of power stored in the energy storage device 50 after the output to the power grid 400 is made greater than the first preset amount of power.

[0049] Here, the electricity consumption price is the price of the amount of electricity provided by the public power grid 400 to the electricity consumption unit, and the electricity consumption price curve S4 is a curve consisting of electricity consumption prices at different electricity consumption periods, which do not need to be the same, and the power generation cost of the first power generation device 30 is lower than the electricity consumption price of the public power grid 400.

[0050] Specifically, the predetermined electricity consumption price curve S4 can be obtained by predicting from past electricity consumption prices. For example, the electricity consumption prices for each electricity price period of the current weekend can be obtained by obtaining the past electricity consumption prices for the three or five weekends before the current weekend and taking the average value of each corresponding electricity price period of the previous three weekends as the electricity consumption price for the corresponding electricity price period of the current weekend, and the electricity consumption price curve S4 for the current weekend can be plotted. The electricity consumption prices for each electricity price period of the current business day can be obtained by obtaining the past electricity consumption prices for the three or five business days before the current business day and taking the average value of each corresponding electricity price period of the previous three business days as the electricity consumption price for the corresponding electricity price period of the current business day, and the electricity consumption price curve S4 for the current business day can be plotted.

[0051] The memory 72 can store a predetermined electricity consumption price curve S4, and the processor 71 can determine a target electricity consumption price when the energy system 100 is in an on-grid state based on the predetermined electricity consumption price curve S4. For example, the processor 71 divides 24 hours into 12 electricity price periods, each of which includes 2 hours, and determines the average value of the electricity consumption prices during the 2 hours as the electricity consumption price of the current electricity consumption period. The processor 71 ranks the electricity consumption prices of the 12 electricity price periods based on the electricity consumption price curves S4 of the 12 electricity price periods, and the processor 71 can finally determine the maximum value of the electricity consumption prices of the 12 electricity price periods as the target electricity consumption price. Alternatively, the target electricity consumption price is the median value of the electricity consumption prices of the 12 electricity price periods, or the target electricity consumption price is the average value of the electricity consumption prices of the 12 electricity price periods, or the target electricity consumption price is the fourth, fifth, etc. ranking of the electricity consumption prices of the 12 electricity price periods.

[0052] After the processor 71 determines the power selling period, the power selling period during which the power selling price is higher than the target electricity consumption price is set as the target power selling period, the amount of electricity stored in the energy storage device 50 is sold during the target power selling period, and the remaining amount of electricity in the energy storage device 50 after the power selling is made greater than the first preset power amount (for example, the first preset power amount can be set to 50%, 70%, etc.).

[0053] For example, the processor 71 divides 24 hours into 12 electricity price periods, each period containing 2 hours, and the processor 71 determines two electricity price periods corresponding to 9:00 PM to midnight as the electricity selling periods, of which the electricity selling price in the electricity selling period corresponding to 9:00 PM to 10:00 PM is lower than the target electricity consumption price and the electricity selling price in the electricity selling period corresponding to 11:00 PM to midnight is higher than the target electricity consumption price, and the processor 71 sets the electricity price period corresponding to 11:00 PM to midnight as the target electricity selling period, and the processor 71 can sell more than 50% of the electricity stored in the energy storage device 50 in the electricity price period corresponding to 11:00 PM to midnight.

[0054] Alternatively, after the processor 71 determines the power selling period, if there is no power selling period in which the power selling price is higher than the target electricity consumption price, the processor 71 does not sell power. For example, if the processor 71 determines the power selling period as two electricity price periods corresponding to 9:00 PM to midnight, but the power selling prices of the two electricity price periods are both lower than the target electricity consumption price, the processor 71 does not sell power.

[0055] In this way, the target electricity consumption price is determined using the preset electricity consumption price curve S4, and during the electricity selling period when the electricity selling price is higher than the target electricity consumption price, an amount of electricity greater than the first preset amount of electricity stored in the energy storage device 50 is sold, thereby making the electricity selling price relatively reasonable and improving the user's profits.

[0056] Referring again to FIGS. 3 and 7, in some embodiments, the power management method further includes the following steps:

[0057] In step 017, weather information is acquired, and the second generated power of the first power generating device 30 in each power consumption period is predicted based on the weather information and the generated power curve S2 of the first power generating device 30.

[0058] In step 018, the first preset amount of power is set based on the second generated power and the power consumption in each power consumption period within the preset time period.

[0059] The weather information may include sunshine information, water level information, wind information, and the like.

[0060] Specifically, the power generation curve S2 is generated based on the first power generation power predicted for each power consumption period. However, the method for predicting the first power generation power for each power consumption period is omitted here, as it is specifically described in step 011.

[0061] The processor 71 acquires weather information, and based on the acquired weather information and the power generation power curve S2 of the first power generation device 30, the second power generation power of the first power generation device 30 in each power consumption period can be predicted. The power generation power curve S2 is a curve of the first power generation power, and since weather affects the power generation power of the first power generation device 30, the power generation power curve S2 can be adjusted based on the weather information. In the case of a solar power generation first power generation device 30, the power generation power of the first power generation device 30 decreases due to cloudy weather, so the power generation power curve S2 needs to be adjusted accordingly. A power generation power curve S5 corresponding to the second power generation power can be obtained, and the second power generation power in each power consumption period can be obtained based on the power generation power curve S5.

[0062] The processor 71 can then set the first preset amount of energy based on the second generated power and power consumption during each power consumption period within the preset time (the preset time may be 4 hours, 12 hours, 24 hours, etc.). For example, the processor 71 calculates the amount of power consumption and power generation during the preset time from the second generated power and power consumption during each power consumption period within the preset time, and determines the first preset amount of energy from the difference between the amount of power consumption and the amount of power generation. For example, the first preset amount of energy is the difference, and if the difference is negative, the first preset amount of energy is 0%. In this way, it is guaranteed that the amount of energy remaining in the energy storage device 50 in advance will meet the power demand during the preset time without using power from the public power grid 400, thereby achieving power self-sufficiency.

[0063] For example, if the first power generating device 30 uses solar power generation, the first preset power amount can be set to a relatively small percentage, such as 0% or 5%, in sunny weather such as clear skies, and to a relatively large percentage, such as 50% or 70%, in poorly lit weather such as cloudy skies. Furthermore, if the first power generating device 30 uses wind power generation, the first preset power amount can be set to a relatively small percentage, such as 0% or 5%, in windy weather with sufficiently strong winds, and to a relatively large percentage, such as 50% or 70%, in light winds with relatively weak winds. Furthermore, if the first power generating device 30 uses hydroelectric power generation, the first preset power amount can be set to a relatively small percentage, such as 0% or 5%, in rainy weather with sufficiently strong hydroelectric power, and to a relatively large percentage, such as 50% or 70%, in sunny or cloudy weather with relatively weak hydroelectric power.

[0064] In this way, by obtaining weather information and the power generation power curve S2 of the first power generation device 30, predicting the second power generation power of the first power generation device 30, and setting the first preset power amount from the second power generation power and power consumption in each power consumption period within the preset time, it is possible to sell surplus power from the energy storage device 50 under the premise of achieving self-sufficiency in power, thereby improving the user's profits.

[0065] Referring to FIG. 8, in some embodiments, the power management method further includes the following steps:

[0066] In step 019, when the first generated power is smaller than the consumed power and the energy storage device 50 is in a state where it can supply power, the energy storage device 50 is controlled to supply power to the power distribution device 40, and being in a state where the energy storage device 50 can supply power includes the remaining power amount of the energy storage device 50 being greater than the second preset power amount.

[0067] Specifically, when the remaining power amount of the energy storage device 50 is greater than the second preset power amount (for example, the second preset power amount may be 40%, 50%, etc.), the energy storage device 50 is in a state where it can supply power, and at this time, the energy storage device 50 can supply power to the power distribution device 40. When the first generated power is smaller than the consumed power (or the first generated power is equal to the consumed power) and the energy storage device 50 is in a state where it can supply power, the processor 71 controls the energy storage device 50 to supply power to the power distribution device 40, and the power distribution device 40 can transmit the amount of power to the load 200. For example, when the amount of power generated by the first power generation device 30 does not meet the demand of the load 200, the processor 71 adjusts the output power of the energy storage device 50 that is in a state where it can supply power, and supplies the amount of power stored in the energy storage device 50 to the power distribution device 40, and the power distribution device 40 can provide the amount of power to the load 200 so as to meet the demand of the load 200.

[0068] In this way, when the first generated power is smaller than the consumed power and the energy storage device 50 is in a state where it can supply power, the energy storage device 50 is controlled to supply power to the power distribution device 40, thereby reducing the amount of power that the user purchases from the public power grid 400 and reducing the user's costs.

[0069] Referring to FIG. 9, in some embodiments, the energy system 100 further includes a second power generation device 60 that supplies power to the power distribution device 40, and the power management method further includes the following steps.

[0070] In step 020, when the first generated power is smaller than the consumed power and the energy storage device 50 is in a state where it is unable to supply power, the second power generation device 60 is controlled to generate power or the distribution device 40 is controlled to connect to the public power grid 400, and the power generation cost of the second power generation device 60 is greater than the power generation cost of the first power generation device 30, and the energy storage device 50 being in a state where it is unable to supply power includes the remaining power of the energy storage device 50 being smaller than the third preset power amount.

[0071] Here, the second power generation device 60 is a facility that generates power by using a non-renewable primary energy resource or secondary energy, such as a fuel power generation device or a natural gas power generation device.

[0072] Specifically, the energy system 100 further includes a second power generation device 60 capable of supplying power to the power distribution device 40. The energy storage device 50 is set to a third preset power amount (for example, the third preset power amount can be 5%, 10%, etc.) that can be the amount of power required for the target load 200 (the load 200 that requires continuous operation). When the remaining power of the energy storage device 50 is less than the third preset power amount, the energy storage device 50 is unable to supply power, and when the energy storage device 50 is in a state where it is unable to supply power, it supplies power only to the target load 200 and cannot supply power to loads 200 other than the target load 200, thereby ensuring only the continuous operation of the target load 200.

[0073] In this case, when the first generated power is smaller than the consumed power (or the first generated power is equal to the consumed power) and the energy storage device 50 is in a state where it cannot supply power, the processor 71 controls the second power generation device 60 to generate power or controls the distribution device 40 to connect to the public power grid 400, so that the distribution device 40 can transmit an amount of power to the load 200, and the power generation cost of the second power generation device 60 is higher than the power generation cost of the first power generation device 30, and the power generation cost of the first power generation device 30 is lower than the electricity consumption price of the public power grid 400. For example, when the amount of electricity generated by the first power generation device 30 does not meet the demand of the load 200 and the energy storage device 50 is in a state where it is unable to supply power, the processor 71 can control the second power generation device 60 to generate electricity or control the distribution device 40 to connect to the public power grid 400, and can supply power to the distribution device 40 via the second power generation device 60 or the public power grid 400, and further can cause the distribution device 40 to supply an amount of electricity to the load 200 so as to meet the demand of the load 200.

[0074] In this way, when the first generated power is smaller than the consumed power and the energy storage device 50 is in a state where it is unable to supply power, the second power generation device 60 is controlled to generate power or the power distribution device 40 is controlled to connect to the public power grid 400, thereby supplying power to the power distribution device 40 via the second power generation device 60 or the public power grid 400 and meeting the demand for the amount of power required by the load 200.

[0075] Referring to Figures 10 and 11, in some embodiments, the step of controlling the second power generation device 60 to generate power or controlling the distribution device 40 to connect to the public power grid 400 in step 020 further includes the following steps.

[0076] In step 0201, if the power generation cost of the second power generation device 60 is greater than the current power consumption price of the public power grid 400 and the energy system 100 is in an on-grid state, the power distribution device 40 is controlled to connect to the public power grid 400.

[0077] In step 0202, if the power generation cost of the second power generation device 60 is lower than the current power consumption price of the public power grid 400 or the energy system 100 is in an off-grid state, the second power generation device 60 is controlled to generate power.

[0078] Specifically, when the amount of power generated by the first power generation device 30 and the energy storage device 50 are in a state where they cannot supply power, the processor 71 can control the second power generation device 60 to generate power or control the power distribution device 40 to connect to the public power grid 400. For example, when the power generation cost of the second power generation device 60 is greater than (or equal to) the current power consumption price of the public power grid 400 and the energy system 100 is in an on-grid state, the electricity cost will be obviously lower if the second power generation device 60 is connected to the public power grid 400, and the processor 71 can control the power distribution device 40 to connect to the public power grid 400, and the amount of power supplied by the public power grid 400 can be used to meet the demand of the load 200. When the power generation cost of the second power generation device 60 is less than (or equal to) the current power consumption price of the public power grid 400, the electricity cost will be obviously higher if the second power generation device 60 is connected to the public power grid 400, and the electricity cost of generating electricity using the second power generation device 60 is lower. The processor 71 controls the second power generation device 60 to generate electricity and uses the amount of electricity supplied by the second power generation device 60 to meet the demand of the load 200, or if the energy system 100 is in an off-grid state (an off-grid state is a state in which the energy system 100 is not connected to the public power grid 400), since power cannot be supplied using the public power grid 400 at this time, the processor 71 can control only the second power generation device 60 to generate electricity and uses the amount of electricity supplied from the second power generation device 60 to meet the demand of the load 200.

[0079] In this way, the processor 71 can minimize electricity costs by controlling the power distribution device 40 to connect to the public power grid 400 and supply power to the load 200, or by controlling the second power generation device 60 to generate power and supply it to the load 200, thereby meeting the power supply requirements of the load 200 while reducing the user's electricity costs.

[0080] Referring again to FIG. 2 , in some embodiments, the energy system 100 further includes a second power generation device 60 having a higher power generation cost than the first power generation device 30, and the power distribution device 40 includes a power supply circuit 41 and a switch 42, the power supply circuit 41 is connected to the switch 42, the switch 42 is connected to a load 200, and the switch 42 is arranged to control the energization and de-energization of the load 200, and the first power generation device 30 and the second power generation device 60 supply power to the power supply circuit 41.

[0081] Specifically, the power generation cost of the second power generation device 60 included in the energy system 100 is higher than the power generation cost of the first power generation device 30. The power distribution device 40 includes a power supply circuit 41 and a switch 42, the power supply circuit 41 can be connected to the switch 42, the first power generation device 30, and the second power generation device 60, the switch 42 can be a smart outlet, the switch 42 is connected to one or more loads 200, and the switch 42 can control the energization and de-energization of the corresponding loads 200, the first power generation device 30 and the second power generation device 60 supply power to the power supply circuit 41, and then the power supply circuit 41 supplies power to the loads 200 corresponding to the switches 42 that are in the on state.

[0082] Referring again to FIG. 2 , in some embodiments, the load 200 includes a first load 210 and a second load 220, and the switch 42 maintains the first load 210 in a powered state throughout each power consumption period, and places the second load 220 in a powered state during a power consumption period in which the power consumption price is less than a predetermined power price threshold and in a powered-off state during a power consumption period in which the power consumption price is greater than the predetermined power price threshold, and the real-time requirement of the first load 210 is greater than the real-time requirement of the second load 220.

[0083] Specifically, the load 200 includes a first load 210 and a second load 220, and the real-time requirement of the first load 210 is greater than the real-time requirement of the second load 220. For example, the first load 210 is a non-time-shiftable equipment that operates immediately when needed, such as a lamp or a refrigerator. This allows the first load 210 to be kept in a powered state during each power consumption period, ensuring that the first load 210 operates immediately when needed, thereby ensuring a good user experience. The second load 220 may be a time-shiftable facility such as a facility that can be operated at any time and ensures normal use. For example, the second load 220 may be a water heater that can heat at any time and can be used by the user at any time due to its heat retention function. Therefore, the second load 220 can be energized during a power consumption period in which the power consumption price is lower than a predetermined power price threshold (the predetermined power price threshold may be the average value of the power consumption price in each power price period), thereby ensuring a reduction in power costs when the second load 220 is operating, which is advantageous for saving power costs.

[0084] In this way, by establishing real-time performance of the power consumption of the first load 210 and the second load 220, the processor 71 can determine the first load 210 among the multiple loads 200 and the second load 220 among the multiple loads 200, making it easier for the processor 71 to realize power on / off control of the first load 210 and the second load 220.

[0085] Referring to Figures 2 and 12, in some embodiments, the distribution device 40 further includes a first switch 421 connected to the first power generation device 30 and one or more second switches 422 respectively connected to one or more loads 200, and the step of obtaining the first generated power of the first power generation device 30 and the power consumption of the one or more loads 200 in step 011 includes the following steps.

[0086] In step 0111 , the first generated power of the first power generating device 30 is obtained from the first switch 421 .

[0087] In step 0112, the power consumption of one or more loads 200 is obtained from one or more second switches 422, respectively.

[0088] Specifically, the power distribution device 40 further includes a first switch 421 and a second switch 422, which may be smart outlets. The first switch 421 can be electrically connected to the first power generation device 30, or the first switch 421 can be electrically connected to the second power generation device 60, and the first switch 421 can obtain the first generated power of the first power generation device 30, or the first switch 421 can obtain the second generated power of the second power generation device 60.

[0089] The number of second switches 422 may be one or more, and is not limited here, but one or more second switches 422 can be electrically connected to one or more loads 200, thereby allowing the second switches 422 to obtain the power consumption of the one or more loads 200.

[0090] In this way, by connecting the first switch 421 to the first power generation device 30, the first generated power of the first power generation device 30 can be accurately obtained, and by connecting the second switch 422 to the load 200, the power consumption of the load 200 can be accurately obtained.

[0091] Referring to FIG. 2, in some embodiments, the energy management unit 80 may be an independent structure and may include a first energy management unit 81 electrically connected to the power supply circuit 41 .

[0092] Specifically, in some embodiments, the first energy management unit 81 is installed in an external environment and connected to equipment such as the first power generation device 30, the first switch 421, and the second switch 422 via a wired or wireless connection. Data from the equipment such as the first power generation device 30, the first switch 421, and the second switch 422 is transmitted to the energy management unit 80, and the first energy management unit 81 can analyze the received data and output a control policy. By providing the first energy management unit 81 independently from the first power generation device 30, the scalability of the energy system 100 can be improved. For example, when equipment in the energy system 100 (e.g., the first power generation device 30, the first switch 421, the second switch 422, etc.) needs to be expanded, the expanded equipment can be used normally simply by establishing communication between the expanded equipment and the first energy management unit 81. Furthermore, by providing the first energy management unit 81 separately and independently from the first power generation device 30, it can be controlled and managed independently from equipment such as the first power generation device 30, the first switch 421, the second switch 422, etc., thereby improving the flexibility of the first energy management unit 81 and allowing the external first energy management unit 81 to select, control, and manage appropriate equipment such as the first power generation device 30 according to actual needs, thereby realizing rational energy allocation in the energy system 100.

[0093] Referring to FIG. 2, in some embodiments, the energy management unit 80 may include a second energy management unit 82 integrated into the first power generation plant 30 .

[0094] Specifically, in some embodiments, the second energy management unit 82 is connected to equipment such as the first power generation device 30, the first switch 421, and the second switch 422 via a wired or wireless connection, and transmits data from the equipment such as the first power generation device 30, the first switch 421, and the second switch 422 to the second energy management unit 82, so that the second energy management unit 82 can analyze the received data and output a control policy. Integrating the second energy management unit 82 into the first power generation device 30 not only avoids additional installation and wiring work and simplifies the configuration of the energy system 100, but also improves the data reception speed of the second energy management unit 82 and the response efficiency of the second energy management unit 82.

[0095] Referring to Figures 2 and 13, in some embodiments, the first energy management unit 81 and the second energy management unit 82 are used to analyze the received data and output a control policy, and the power management method further includes the following steps:

[0096] In step 021, if the second energy management unit 82 sends a detection signal to the first energy management unit 81 but does not receive a response signal from the first energy management unit 81, the second energy management unit 82 determines that the first energy management unit 81 is abnormal.

[0097] In step 022, if the first energy management unit 81 is abnormal, the second energy management unit 82 takes over the first energy management unit 81.

[0098] Specifically, the energy system 100 includes a first energy management unit 81 and a second energy management unit 82, which are used to analyze received data and output control policies. The first energy management unit 81 and the second energy management unit 82 can detect each other to determine whether the other's operating status is normal. For example, one of the first energy management unit 81 and the second energy management unit 82 transmits a detection signal to the other and receives a response signal returned from the other, which is used to determine whether the other of the first energy management unit 81 and the second energy management unit 82 is abnormal. If the second energy management unit 82 sends a detection signal to the first energy management unit 81 but does not receive a response signal from the first energy management unit 81, the second energy management unit 82 can determine that the first energy management unit 81 is abnormal (e.g., downtime, etc.), and thus the second energy management unit 82 can take over the work of the first energy management unit 81. That is, in this case, the second energy management unit 82 can obtain the total output power of the first power generation device 30 and the total output power of the second power generation device 60, obtain the power consumption of each load 200 to obtain the total power consumption of the loads 200, and adjust at least part of the output power based on the total output power and the total power consumption, thereby preventing the energy system 100 from becoming inoperable when the first energy management unit 81 is abnormal, and improving the stability of the energy system 100.

[0099] 2 and 14 again, the power management device 10 according to the embodiment of the present application is applied to an energy system 100 including a first power generation device 30, a power distribution device 40, and an energy storage device 50. The power distribution device 40 connects the first power generation device 30 that supplies power to the power distribution device 40, the energy storage device 50, and one or more loads 200. The power management device 10 includes a first acquisition module 11, a first control module 12, and a first determination module 13. The first acquisition module 11 is used to acquire the first generated power of the first power generation device 30 and the power consumption of the one or more loads 200. The first control module 12 is used to acquire the first generated power of the first power generation device 30 and the power consumption of the one or more loads 200. The trading module 14 is used to control the energy storage device 50 to store electricity when the generated electricity is greater than the consumed electricity, the first determination module 13 is used to determine the electricity selling period based on a preset electricity selling price curve S3, the electricity selling price curve S3 includes a plurality of electricity price periods, and the electricity selling period is an electricity price period among the plurality of electricity price periods in which the ranking of the electricity price according to the electricity selling price satisfies the preset ranking, and the trading module 14 is used to output the amount of electricity of the energy storage device 50 to the power grid 400 during the electricity selling period, and to make the remaining amount of electricity of the energy storage device 50 after outputting to the power grid 400 greater than the first preset amount of electricity.

[0100] Specifically, the first determination module 13 is used to determine the predicted time required for the energy storage device 50 to be fully charged based on the first generated power in each power consumption period, the power consumption in each power consumption period, and the remaining power of the energy storage device 50, and to determine the power selling period based on the power selling price curve S3 within the predicted time.

[0101] The power management device 10 further includes a second determination module 15, which is used to determine a target electricity consumption price based on a preset electricity consumption price curve S4.

[0102] The power management apparatus 10 further includes a third determination module 16, which is used to determine a target power selling period in which the power selling price is greater than the target electricity consumption price among the power selling periods.

[0103] The trading module 14 is specifically used to output the amount of electricity of the energy storage device 50 to the power grid 400 during the target electricity selling period, and to make the remaining amount of electricity of the energy storage device 50 after outputting to the power grid 400 greater than the first preset amount of electricity.

[0104] The power management device 10 further includes a second acquisition module 17, which acquires weather information and is used to predict the second power generation power of the first power generation device 30 in each power consumption period based on the weather information and the power generation power curve S2 of the first power generation device 30.

[0105] The power management device 10 further includes a setting module 18, which is used to set a first preset amount of power based on the second generated power and the consumed power in each power consumption period within the preset time.

[0106] The power management device 10 further includes a second control module 19, which is used to control the energy storage device 50 to supply power to the power distribution device 40 when the first generated power is smaller than the consumed power and the energy storage device 50 is in a state where it can supply power, and the energy storage device 50 being in a state where it can supply power includes the remaining power of the energy storage device 50 being greater than the second preset power amount.

[0107] The power management device 10 further includes a third control module 20, which is used to control the second power generation device 60 to generate power or to control the power distribution device 40 to connect to the public power grid 400 when the first generated power is smaller than the consumed power and the energy storage device 50 is in a state where it is unable to supply power, and the power generation cost of the second power generation device 60 is greater than the power generation cost of the first power generation device 30, and the energy storage device 50 being in a state where it is unable to supply power includes the remaining power of the energy storage device 50 being smaller than the third preset power amount.

[0108] The third control module 20 is specifically used to control the distribution device 40 to connect to the public power grid 400 when the power generation cost of the second power generation device 60 is greater than the current power consumption price of the public power grid 400 and the energy system 100 is in an on-grid state, and to control the second power generation device 60 to generate power when the power generation cost of the second power generation device 60 is less than the current power consumption price of the public power grid 400 or the energy system 100 is in an off-grid state.

[0109] The first acquisition module 11 is specifically used to acquire the first generated power of the first power generation device 30 from the first switch 421 and acquire the power consumption of one or more loads 200 from one or more second switches 422, respectively.

[0110] The power management device 10 further includes a fourth determination module 21, which is used by the second energy management unit 82 to determine that the first energy management unit 81 is abnormal when the second energy management unit 82 sends a detection signal to the first energy management unit 81 but does not receive a response signal returned from the first energy management unit 81.

[0111] The power management apparatus 10 further includes a takeover module 22, which is used for the second energy management unit 82 to take over from the first energy management unit 81 when the first energy management unit 81 is abnormal.

[0112] Referring again to FIG. 2, an energy management device 70 according to an embodiment of the present application includes a processor 71 and a memory 72 storing a computer program 73 that, when executed by the processor 71, is capable of implementing the steps of the power management method of any of the above embodiments, which are omitted here for the sake of brevity.

[0113] Referring again to FIG. 2 , an energy system 100 according to an embodiment of the present application includes a first power generation device 30, a power distribution device 40, an energy storage device 50, and an energy management device 70, where the energy management device 70 connects the first power generation device 30, the power distribution device 40, and the energy storage device 50, and the power distribution device 40 connects the first power generation device 30, the energy storage device 50, and one or more loads 200.

[0114] Specifically, the energy system 100 includes a first power generation device 30, a power distribution device 40, an energy storage device 50, and an energy management device 70. The energy management device 70 can connect the first power generation device 30 to acquire power generated by the first power generation device 30, and the energy management device 70 can connect the power distribution device 40 and the energy storage device 50, so that the energy management device 70 can control the power distribution device 40 to transmit power to the energy storage device 50. The power distribution device 40 connects the first power generation device 30, the energy storage device 50, and one or more loads 200, so that the power generated by the first power generation device 30 can be transmitted to the energy storage device 50 and one or more loads 200 via the power distribution device 40.

[0115] Referring to FIG. 15, an embodiment of the present application provides a computer-readable storage medium 300 storing a computer program 310 that, when executed by a processor 320, implements the steps of the power management method of any of the above embodiments, which are omitted here for the sake of brevity.

[0116] In the description herein, references to "some embodiments," "one example," "exemplary," and the like mean that a particular feature, structure, material, or characteristic described in connection with at least one embodiment or example of the present application is included in at least one embodiment or example of the present application. In the description of the present application, general references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and combine different embodiments or examples, and features of different embodiments or examples, described herein without mutual contradiction.

[0117] Any process or method description in a flowchart or otherwise described herein can be understood as representing a module, fragment, or portion of code of executable instructions comprising one or more steps for realizing a particular logical function or process, and it should be understood by those skilled in the art to which the embodiments of this specification pertain, that the scope of the preferred embodiments of this application may include additional realizations that are out of the order shown or discussed, including performing functions substantially simultaneously or in reverse order based on the functionality involved.

[0118] Although embodiments of the present application have been shown and described above, the above embodiments are illustrative and should not be construed as limiting the present application, and it will be understood that those skilled in the art can change, modify, substitute, and vary the above examples within the scope of the present application.

Claims

1. A power management method is applied to an energy system including a first power generation device, a power distribution device, and an energy storage device, the power distribution device connecting the first power generation device that supplies power to the power distribution device, the energy storage device, and one or more loads, the power management method comprising: acquiring a first generated power of the first power generation device and a power consumption of the one or more loads; When the first generated power is greater than the consumed power, controlling the energy storage device to store power; determining a power selling period based on a predetermined power selling price curve, the power selling price curve including a plurality of power price periods, and the power selling period being an electricity price period among the plurality of power price periods in which a ranking of the power selling price satisfies a predetermined ranking; a step of outputting the amount of power of the energy storage device to the power grid during the power selling period, and making the remaining amount of power of the energy storage device after outputting to the power grid greater than a first preset amount of power.

2. The step of determining the power selling period based on the predetermined power selling price curve includes: determining a predicted time required for the energy storage device to be fully charged based on the first generated power in each power consumption period, the power consumption in each power consumption period, and a remaining amount of power in the energy storage device; The power management method according to claim 1 , further comprising: determining the power selling period based on the power selling price curve within the predicted time period.

3. determining a target electricity consumption price based on a predetermined electricity consumption price curve; determining a target power selling period in which the power selling price is higher than the target electricity consumption price, among the power selling periods; The step of outputting the amount of power of the energy storage device to the power grid during the power selling period and making the remaining amount of power of the energy storage device after the output to the power grid greater than a first preset amount of power includes:

2. The power management method according to claim 1, further comprising a step of outputting the amount of power of the energy storage device to the power grid during the target power selling period, and making the remaining amount of power of the energy storage device after outputting to the power grid greater than the first preset amount of power.

4. 4. The power management method according to claim 3, wherein the power selling price curve is predicted based on past power selling prices, and the power consumption price curve is predicted based on past power consumption prices.

5. acquiring weather information and predicting a second generated power of the first power generating device in each power consumption period based on the weather information and a generated power curve of the first power generating device; The power management method according to any one of claims 2 to 4, further comprising a step of setting the first predetermined amount of power based on the second generated power and the power consumption in each power consumption period within a predetermined time.

6. 2. The power management method according to claim 1, further comprising the step of controlling the energy storage device to supply power to the power distribution device when the first generated power is smaller than the consumed power and the energy storage device is in a state where it can supply power, and the state where the energy storage device is in a state where it can supply power includes the state where the remaining power of the energy storage device is greater than a second preset power amount.

7. The energy system further includes a second power generation device that supplies power to the power distribution device, and the power management method includes:

2. The power management method according to claim 1, further comprising the step of controlling the second power generation device to generate power or controlling the power distribution device to connect to a public power grid when the first generated power is smaller than the consumed power and the energy storage device is in a state where it is unable to supply power, wherein the power generation cost of the second power generation device is greater than the power generation cost of the first power generation device, and the energy storage device being in a state where it is unable to supply power includes the remaining power amount of the energy storage device being smaller than a third preset power amount.

8. The step of controlling the second power generation device to generate power or controlling the power distribution device to connect to a public power grid includes: When the power generation cost of the second power generation device is greater than the current power consumption price of the public power grid and the energy system is in an on-grid state, controlling the power distribution device to connect to the public power grid; and controlling the second power generation device to generate power when a power generation cost of the second power generation device is lower than a current power consumption price of the public power grid or when the energy system is in an off-grid state.

9. 2. The power management method of claim 1, wherein the energy system further includes a second power generation device having a power generation cost higher than that of the first power generation device, the power distribution device includes a power supply circuit and a switch, the power supply circuit is connected to the switch, the switch is connected to the load, and the switch is arranged to control energization and de-energization of the load, and the first power generation device and the second power generation device supply power to the power supply circuit.

10. 10. The power management method of claim 9, wherein the loads include a first load and a second load, the switch maintains the first load in a powered state throughout each power consumption period, turns the second load in a powered state during a power consumption period in which the power consumption price is less than a predetermined power price threshold, and turns the second load in a powered state during a power consumption period in which the power consumption price is greater than the predetermined power price threshold, and the real-time requirement of the first load is greater than the real-time requirement of the second load.

11. The power distribution device further includes a first switch connected to the first power generation device and one or more second switches connected to the one or more loads, respectively, and the step of acquiring the first generated power of the first power generation device and the power consumption of the one or more loads includes: obtaining the first generated power of the first power generation device from the first switch; and obtaining the power consumption of the one or more loads from the one or more second switches, respectively.

12. The energy system further includes an energy management unit, the energy management unit including a first energy management unit, the first energy management unit having an independent structure and electrically connected to the power supply circuit; and / or 2. The method of claim 1, wherein the energy management unit comprises a second energy management unit integrated with a first power generation device.

13. The first energy management unit and the second energy management unit are used to analyze received data and output a control policy, and the power management method includes: When the second energy management unit sends a detection signal to the first energy management unit but does not receive a response signal from the first energy management unit, the second energy management unit determines that the first energy management unit is abnormal; The power management method of claim 12 , further comprising: if the first energy management unit is abnormal, the second energy management unit takes over the first energy management unit.

14. A power management device is applied to an energy system including a first power generation device, a power distribution device, and an energy storage device, the power distribution device connecting the first power generation device that supplies power to the power distribution device, the energy storage device, and one or more loads, the power management device: a first acquisition module used to acquire a first generated power of the first power generation device and a power consumption of the one or more loads; a first control module used to control the energy storage device to store power when the first generated power is greater than the consumed power; a first determination module used to determine an electricity selling period based on a predetermined electricity selling price curve, the electricity selling price curve including a plurality of electricity price periods, and the electricity selling period being an electricity price period among the plurality of electricity price periods in which a ranking of electricity prices according to the electricity selling price satisfies a predetermined ranking; a trading module used to output the amount of power of the energy storage device to the power grid during the power selling period and to make the remaining amount of power of the energy storage device after outputting to the power grid greater than a first preset amount of power.

15. An energy management device, a processor; a memory, An energy management device, characterized in that the memory stores a computer program that, when executed by the processor, implements the steps of the power management method according to any one of claims 1 to 13.

16. 13. An energy system comprising: a first power generation device; a power distribution device; an energy storage device; and the energy management device described in claim 12, wherein the energy management device connects the first power generation device, the power distribution device, and the energy storage device, and the power distribution device connects the first power generation device, the energy storage device, and one or more loads.

17. 14. A non-volatile computer readable storage medium containing a computer program, which, when executed by a processor, causes the processor to perform the power management method of any one of claims 1 to 13.

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