Electricity management method and device, energy management device and energy system

Abstract

An electricity management method, an electricity management device (10), an energy management device (70), an energy system (100) and a storage medium (300). The electricity management method comprises: acquiring first power generation power of a first power generation device (30) and electric power of a load (200); when the first power generation power is higher than the electric power, controlling an energy storage device (50) to store electricity; and on the basis of a determined electricity retailing time period, outputting the electricity of the energy storage device (50) to a power grid (400) within the electricity retailing time period.

Description

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

[0001] Priority information

[0002] This application claims priority and benefits of the patent application with patent application number "202310970743.0" filed with the State Intellectual Property Office of China on August 2, 2023, and priority and benefits of the patent application with patent application number 202310979971.4 filed with the State Intellectual Property Office of China on August 3, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of energy management technology, and more specifically, to a power management method, a power management device, an energy management device, an energy system, and a non-volatile computer-readable storage medium. Background Art

[0004] With the development and growth of new energy sources, many households no longer rely on the public power grid for electricity supply. Instead, they choose to use renewable energy sources such as photovoltaic power generation, wind power generation, and tidal power generation. However, after using renewable energy to power household appliances, the excess electricity produced by renewable energy generation is wasted or purchased by the public power grid at a lower price. If the renewable energy generation cannot meet the electricity needs of household appliances, the excess electricity needs to be purchased from the public power grid at a higher price, thereby increasing the household's electricity costs.

[0005] Summary of the Invention

[0006] Embodiments of the present application provide a power management method, a power management device, an energy management device, an energy system, and a non-volatile computer-readable storage medium.

[0007] The power management method of the embodiment of the present application is applied to an energy system, which includes a first power generation device, a distribution device and an energy storage device, the distribution device is connected to the first power generation device, the energy storage device and one or more loads, the first power generation device supplies power to the distribution device, and the power management method includes obtaining a first power generation power of the first power generation device and the power consumption of the one or more loads; when the first power generation power is greater than the power consumption, controlling the energy storage device to store power; determining a power selling period according to a preset on-grid electricity price curve, the on-grid electricity price curve includes multiple electricity price periods, and the power selling period is an electricity price period whose electricity price ranking among the multiple electricity price periods meets a preset ranking, and the electricity price ranking is based on the electricity selling price; during the power selling period, the power of the energy storage device is output to the power grid, and the remaining power of the energy storage device after output to the power grid is greater than the first preset power.

[0008] The power management device of the embodiment of the present application is applied to an energy system, which 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, the energy storage device and one or more loads. The first power generation device supplies power to the power distribution device. The power management device includes a first acquisition module and a first control module. The first acquisition module is used to obtain the first power generation 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 power generation power is greater than the power consumption; the first determination module is used to determine the power selling period according to a preset grid-connected electricity price curve, the grid-connected electricity price curve includes multiple electricity price periods, and the power selling period is the electricity price period whose electricity price ranking among the multiple electricity price periods meets the preset ranking, and the electricity price ranking is based on the electricity selling price; the transaction module is used to output the electricity of the energy storage device to the power grid during the power selling period, and make the remaining electricity of the energy storage device after output to the power grid greater than the first preset electricity.

[0009] The energy management device of the embodiment of the present application includes a processor and a memory, wherein the memory stores a computer program, and the computer program implements the steps of the power management method when executed by the processor. The power management method includes obtaining the first power generation power of the first power generation device and the power consumption of the one or more loads; when the first power generation power is greater than the power consumption, controlling the energy storage device to store electricity; determining a power selling period according to a preset on-grid electricity price curve, wherein the on-grid electricity price curve includes multiple electricity price periods, and the power selling period is a power price period whose electricity price ranking among the multiple electricity price periods meets a preset ranking, and the electricity price ranking is based on the electricity selling price; during the power selling period, the power of the energy storage device is output to the power grid, and the remaining power of the energy storage device after output to the power grid is greater than the first preset power.

[0010] The energy system of the 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 is connected to the first power generation device, the power distribution device and the energy storage device, and the power distribution device is connected to the first power generation device, the energy storage device and one or more loads.

[0011] The non-volatile computer-readable storage medium of the embodiment of the present application has a computer program stored thereon, and when the computer program is executed by a processor, the processor is enabled to execute the power management method described above. The power management method includes obtaining the first power generation power of the first power generation device and the power consumption of the one or more loads; when the first power generation power is greater than the power consumption, controlling the energy storage device to store power; determining a power selling period according to a preset grid-connected electricity price curve, the grid-connected electricity price curve including multiple electricity price periods, the power selling period being a power price period whose electricity price ranking among the multiple electricity price periods meets a preset ranking, the electricity price ranking being based on the power selling price; and outputting the power of the energy storage device to the power grid during the power selling period, and ensuring that the remaining power of the energy storage device after output to the power grid is greater than a first preset power.

[0012] The power management method, power management device, energy management device, energy system and non-volatile computer-readable storage medium of the embodiments of the present application can apply the power management method to the energy system, wherein the energy system includes a first power generation device, a distribution device and an energy storage device, and by connecting the distribution device to the first power generation device, the first power generation device can supply power to the distribution device, and then the distribution device is connected to the energy storage device and one or more loads, so that the electricity generated by the first power generation device can be transported to the energy storage device and the load, so that the first power generation power of the first power generation device and the power consumption of one or more loads can be obtained, and then it can be understood whether the electricity generated by the first power generation device can meet the needs of the load. In the case that the first power generation power of the first power generation device is greater than the power consumption of the load, that is, the electricity generated by the first power generation device meets the power consumption of the load and there is still surplus electricity, then the energy storage device can be controlled to store electricity (such as by adjusting the input power of the energy storage device), and the surplus electricity generated by the first power generation device can be stored in the energy storage device. The electricity selling prices of multiple electricity price periods can be ranked according to the preset grid-connected electricity price curve. In the electricity price period when the ranking of the electricity selling price meets the preset ranking, the electricity of the energy storage device exceeding the first preset electricity can be output to the public power grid. Compared with the energy system without adding the energy storage device, the surplus electricity of the first power generation device can only be wasted or purchased at a low price by the public power grid. The energy storage device can ensure that the electricity generated by the first power generation device is self-generated and used as much as possible, while minimizing the use of electricity from the public power grid, thereby reducing the household's electricity cost.

[0013] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] FIG1 is a flow chart of a power management method according to certain embodiments of the present application;

[0016] FIG2 is a schematic plan view of an energy system according to certain embodiments of the present application;

[0017] FIG3 is a schematic diagram of a power generation curve and a power consumption curve according to certain embodiments of the present application;

[0018] FIG4 is a schematic diagram of a grid-connected electricity price curve and a power price curve according to certain embodiments of the present application;

[0019] FIG5 is a flow chart of a power management method according to certain embodiments of the present application;

[0020] FIG6 is a flow chart of a power management method according to certain embodiments of the present application;

[0021] FIG7 is a flow chart of a power management method according to certain embodiments of the present application;

[0022] FIG8 is a flow chart of a power management method according to certain embodiments of the present application;

[0023] FIG9 is a flow chart of a power management method according to certain embodiments of the present application;

[0024] FIG10 is a flow chart of a power management method according to certain embodiments of the present application;

[0025] FIG11 is a flow chart of a power management method according to certain embodiments of the present application;

[0026] FIG12 is a flow chart of a power management method according to certain embodiments of the present application;

[0027] FIG13 is a flow chart of a power management method according to certain embodiments of the present application;

[0028] FIG14 is a schematic diagram of a module of a power management device according to certain embodiments of the present application;

[0029] FIG15 is a schematic diagram illustrating a connection state between a non-volatile computer-readable storage medium and a processor according to certain embodiments of the present application. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0031] Referring to Figures 1-4, the power management method according to an embodiment of the present application is applied to an 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. The power distribution device 40 is connected to the first power generation device 30, the energy storage device 50, and one or more loads 200. The first power generation device 30 supplies power to the power distribution device 40. The power management method includes:

[0032] Step 011: Obtain the first power generation power of the first power generation device 30 and the power consumption of one or more loads 200.

[0033] 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 can be a device that generates electricity using primary renewable energy, such as a solar power generation device or a wind power generation device. The number of first power generation devices 30 can be multiple (e.g., one or two first power generation devices 30), and can be configured according to actual needs, without limitation herein.

[0034] The power distribution device 40 may be a socket, a plug, an air switch, etc. The number of the power distribution device 40 may be one or more, which is not limited here.

[0035] The energy storage device 50 can be an energy storage device or other device that can be charged and discharged. For example, the energy storage device 50 can be a battery energy storage device, a capacitor energy storage device, etc. The number of energy storage devices 50 can also be one or more, which is not limited here.

[0036] The energy management system 70 (EMS) includes a processor 71 and a memory 72 . The processor 71 can be connected to the power distribution device 40 to communicate with the power distribution device 40 .

[0037] Specifically, by connecting the power distribution device 40 to the first power generation device 30 , and the first power generation device 30 being able to supply power to the power distribution device 40 , the power distribution device 40 can collect the first power generation power of the first power generation device 30 in real time.

[0038] Optionally, since the location of the first power generation device 30 is fixed and the weather and other conditions are basically similar, the changes in the first power generation power at similar times are also basically the same. Each day can be divided into multiple power consumption periods (such as 12 power consumption periods, 24 power consumption periods, 48 ​​power consumption periods, etc. It can be understood that the more time periods there are, the higher the accuracy of the estimation of the first power generation power, and even each moment can be made into a power consumption period). The first power generation device 30 has a corresponding first power generation power in each power consumption period. The first power generation power of the current power consumption period can be estimated by the first power generation power collected within a preset time period in the past (such as within a week, a month, etc.).

[0039] For example, after obtaining the first power generation power of the past week, the first power generation power of the first power consumption period of the day can be estimated based on the first power generation power of the first power consumption period of each day in the week. For example, the average of the first power generation power of the first power consumption period of each day in the week is determined to be the first power generation power of the first power consumption period of the day, thereby realizing the estimation of the first power generation power of each power consumption period.

[0040] By connecting the power distribution device 40 to the energy storage device 50, the electricity generated by the first power generation device 30 can flow into the energy storage device 50 through the power distribution device 40, so that the power distribution device 40 can collect the input power of the energy storage device 50. The energy storage device 50 has corresponding input power in each power consumption period. The input power of the current power consumption period can be collected by estimating the input power collected within a preset period of time in the past (such as one week, one month, etc.), or by collecting the input power in real time during the current power consumption period, so that the processor 71 can obtain the input power of the energy storage device 50.

[0041] The load 200 can be a household appliance or a device that can consume electrical energy. For example, the load 200 can be a washing machine, an electric lamp, etc. By connecting the distribution device 40 to one or more loads 200, the electricity generated by the first power generation device 30 can flow into the load 200 through the distribution device 40, so that the distribution device 40 can collect the power consumption of the load 200. The load 200 has corresponding power consumption in each power consumption period, so that the power consumption curve S1 can be drawn. The power consumption of the current power consumption period can be estimated by the power consumption collected within a preset period of time in the past (such as within a week, a month, etc.), or the power consumption can be collected in real time by the distribution device 40 during the current power consumption period, and then the processor 71 can obtain the power consumption of the load 200.

[0042] Step 012: When the first generated power is greater than the consumed power, control the energy storage device 50 to store electricity.

[0043] Specifically, after obtaining the first generated power and the power consumption, the processor 71 compares the first generated power with the power consumption, and when the first generated power is greater than the power consumption, controls the energy storage device 50 to store electricity, such as by adjusting the input power of the energy storage device 50, so that the first generating device 30 emits excess current into the energy storage device 50 for storage while meeting the power consumption of the load 200.

[0044] Specifically, the input power can be adjusted so that the difference between the first generated power and the total load power (i.e., the sum of the input power and the power consumption, where the energy storage device 50 serves as the load 200) is less than or equal to a preset threshold value (the preset threshold value is an empirical value and can be determined based on the power loss, such as the preset threshold value can be 50W, 100W, etc.). For example, the first generated power is 10,000W, and the power consumption of the load 200 is 5,000W. By setting the preset threshold value to 50W, the input power of the energy storage device 50 is adjusted to between 4,950W and 5,000W.

[0045] Step 013: Determine the electricity selling period according to the preset on-grid electricity price curve S3. The on-grid electricity price curve S3 includes multiple electricity price periods. The electricity selling period is the electricity price period whose ranking meets the preset ranking among the multiple electricity price periods. The electricity price ranking is based on the electricity selling price.

[0046] The on-grid electricity price is the price at which the public grid 400 purchases electricity from power generation units, and the on-grid electricity price curve S3 is a curve formed by on-grid electricity prices in different electricity consumption periods. The on-grid electricity prices in different electricity consumption periods may be different.

[0047] Specifically, the preset on-grid electricity price curve S3 can be obtained based on historical on-grid electricity price predictions. Since electricity consumption on weekdays and weekends is different, separate predictions need to be made. For example, by obtaining the historical on-grid electricity prices of the three or five weekends before the current weekend, and taking the average of the corresponding electricity price periods of the three weekends as the on-grid electricity price for the corresponding electricity price period of the current weekend, the on-grid electricity prices for each electricity price period of the current weekend can be obtained, and the on-grid electricity price curve S3 for the current weekend can be drawn; by obtaining the historical on-grid electricity prices of the three or five working days before the current working day, and taking the average of the corresponding electricity price periods of the three working days as the on-grid electricity price for the corresponding electricity price period of the current working day, the on-grid electricity prices for each electricity price period of the current working day can be obtained, and the on-grid electricity price curve S3 for the current working day can be drawn.

[0048] The memory 72 can store the preset on-grid electricity price curve S3. The processor 71 can determine the electricity selling period based on the preset on-grid electricity price curve S3 when the energy system 100 is in the grid-connected state. For example, the processor 71 can rank the electricity selling prices of the multiple electricity price periods included in the on-grid electricity price curve S3 from low to high, and then the processor 71 can select the electricity price period with a higher ranking than the preset ranking as the electricity selling period.

[0049] For example, the processor 71 can divide the 24 hours of a day into 12 electricity price periods, each electricity price period includes 2 hours, and take the average of the selling electricity prices in the 2 hours as the selling electricity price of the current electricity price period, and then the processor 71 ranks the selling electricity prices of the 12 electricity price periods from low to high. When the preset ranking is set to second place, the processor 71 can determine that the selling electricity period is the first in the ranking of the 12 electricity price periods; or, when the preset ranking is set to third place, the processor 71 can determine that the selling electricity period is the first and second in the ranking of the 12 electricity price periods.

[0050] Optionally, when the current electricity price period has passed the highest electricity selling period of the day, the processor 71 can use the highest ranking electricity price period in the remaining electricity price periods as the electricity selling period. For example, when the electricity price period is 20:00 in a day, the price of selling electricity is the highest, but when the current electricity price period is 22:00, there is a lot of electricity in the energy storage device 50 that needs to be sold, then the processor 71 sells electricity according to the highest ranking electricity price period in the remaining electricity price periods as the electricity selling period.

[0051] Step 014: During the electricity selling period, the power of the energy storage device 50 is output to the grid 400, and the remaining power of the energy storage device 50 after output to the grid 400 is greater than a first preset power.

[0052] After determining the electricity selling period in multiple electricity price periods, the processor 71 can sell the electricity stored in the energy storage device 50 to the public power grid 400 during the electricity selling period, and make the remaining electricity in the energy storage device 50 after the electricity is sold greater than a first preset electricity (such as the first preset electricity can be 50%, 70%, etc.), wherein the first preset electricity can be determined based on the difference between the electricity required for the target load 200 (such as the load 200 that needs to run continuously is the target load 200) to run for a predetermined time (such as 1 hour, 2 hours, etc.) and the power generation of the first power generation device 30 during the predetermined time.

[0053] In this way, by applying the power management method to the energy system 100, wherein the energy system 100 includes a first power generation device 30, a distribution device 40 and an energy storage device 50, and by connecting the distribution device 40 to the first power generation device 30, so that the first power generation device 30 can supply power to the distribution device 40, and then connecting the distribution device 40 to the energy storage device 50 and one or more loads 200, the electricity generated by the first power generation device 30 can be transported to the energy storage device 50 and the load 200, so that the first power generation power of the first power generation device 30 and the power consumption of the load 200 can be obtained, and then it can be understood whether the electricity generated by the first power generation device 30 can meet the needs of the load 200. When the first power generation power of the first power generation device 30 is greater than the power consumption of the load 200, that is, when the electricity generated by the first power generation device 30 meets the power consumption of the load 200, there is still surplus electricity. At this time, the energy storage device 50 can be controlled to store electricity (such as by adjusting the input power of the energy storage device 50). The surplus electricity generated by the first power generation device 30 can be stored in the energy storage device 50, and the selling prices of multiple electricity price periods are ranked according to the preset grid-connected electricity price curve S3. In the electricity price period where the ranking of the selling price is greater than the preset ranking, the electricity of the energy storage device 50 exceeding the first preset electricity is sold. Compared with the energy system 100 without adding the energy storage device 50, the surplus electricity of the first power generation device 30 can only be wasted or purchased at a low price by the public power grid 400. The energy storage device 50 can ensure that the electricity generated by the first power generation device 30 is self-generated and used as much as possible, while minimizing the use of electricity from the public power grid 400, thereby reducing the household's electricity costs.

[0054] Referring to FIG. 5 , in some embodiments, step 013 : determining the electricity selling period according to the preset on-grid electricity price curve S3 , includes:

[0055] Step 0131: Determine an estimated time required to fully charge the energy storage device 50 based on the first generated power of each power consumption period, the power consumption of each power consumption period, and the remaining power of the energy storage device 50;

[0056] Step 0132: Determine the electricity selling period based on the on-grid electricity price curve S3 within the estimated duration.

[0057] 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 consumption of the load 200 in each power consumption period, and the remaining power of the energy storage device 50, so that the processor 71 can obtain the difference between the first generated power and the power consumption in each power consumption period, determine the input power of the energy storage device 50 in each power consumption period, and then the processor 71 can obtain the power required for the energy storage device 50 to be fully charged based on the remaining power of the energy storage device 50 obtained. Finally, the estimated time required for the energy storage device 50 to be fully charged and the input power in each power consumption period can be determined. For example, the input power in each power consumption period is 5 kilowatts, and the power required to fully charge the energy storage device 50 is 20 kilowatt-hours. The estimated time can be calculated as 20 kilowatt-hours / 5 kilowatts = 4 hours, which means that the energy storage device 50 will be fully charged after 4 hours.

[0058] After determining the estimated duration, to prevent electricity waste, it is necessary to sell electricity within the estimated duration. The processor 71 can determine the electricity price period within the estimated duration based on the on-grid electricity price curve S3 within the estimated duration. For example, if there are three electricity price periods, the selling electricity prices within the estimated duration are ranked from low to high, and the electricity price period with a ranking greater than the preset ranking is selected as the electricity selling period. For example, if the preset ranking is second, the electricity price period ranked first among the three electricity price periods is determined as the electricity selling period.

[0059] In this way, the estimated time required to fully charge the energy storage device 50 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, and the electricity selling period is determined based on the on-grid electricity price curve S3 of the estimated time. This can prevent the first power generation device 30 from continuing to generate power after the energy storage device 50 is fully charged, thereby increasing the user's income.

[0060] Please refer to FIG. 4 and FIG. 6 again. In some embodiments, the power management method further includes:

[0061] Step 015: Determine the target electricity price according to the preset electricity price curve S4;

[0062] Step 016: Determine a target electricity selling period during which the electricity selling price is greater than the target electricity price;

[0063] Step 014: Outputting the power of the energy storage device 50 to the grid 400 during the electricity selling period, and ensuring that the remaining power of the energy storage device 50 after outputting the power to the grid 400 is greater than a first preset power, including:

[0064] Step 0141: Output the power of the energy storage device 50 to the grid 400 during the target power selling period, and ensure that the remaining power of the energy storage device 50 after outputting to the grid 400 is greater than a first preset power.

[0065] Among them, the electricity price is the price required for the public power grid 400 to provide electricity to the electricity user, and the electricity price curve S4 is a curve formed by the electricity prices in different electricity consumption periods. The electricity prices in different electricity consumption periods may be different, and the power generation cost of the first power generation device 30 is lower than the electricity price of the public power grid 400.

[0066] Specifically, the preset electricity price curve S4 can be obtained based on historical electricity price predictions. For example, by obtaining the historical electricity prices of the three or five weekends before the current weekend, and taking the average of the corresponding electricity price time periods of the three weekends before as the electricity price for the corresponding electricity price time period of the current weekend, the electricity prices for each electricity price time period of the current weekend can be obtained, and the electricity price curve S4 for the current weekend can be drawn; by obtaining the historical electricity prices of the three or five working days before the current working day, and taking the average of the corresponding electricity price time periods of the three working days before as the electricity price for the corresponding electricity price time period of the current working day, the electricity prices for each electricity price time period of the current working day can be obtained, and the electricity price curve S4 for the current working day can be drawn.

[0067] The memory 72 can store the preset electricity price curve S4, and the processor 71 can determine the target electricity price according to the preset electricity price curve S4 when the energy system 100 is in the grid-connected state. For example, the processor 71 can divide the 24 hours of a day into 12 electricity price periods, each electricity price period includes 2 hours, and the average value of the electricity price in the 2 hours is used as the electricity price of the current electricity price period, and then the processor 71 ranks the electricity prices of the 12 electricity price periods according to the electricity price curve S4 of the 12 electricity price periods. Finally, the processor 71 can determine that the target electricity price is the maximum value of the electricity prices in the 12 electricity price periods; or, the target electricity price is the median of the electricity prices in the 12 electricity price periods; or, the target electricity price is the average of the electricity prices in the 12 electricity price periods; or, the target electricity price is the minimum value of the electricity prices in the 12 electricity price periods; or, the target electricity price is the value ranked 4th, 5th, etc. in the 12 electricity price periods.

[0068] After the processor 71 determines the electricity selling period, the electricity selling period in which the electricity selling price is greater than the target electricity price is used as the target electricity selling period, and the electricity stored in the energy storage device 50 is sold during the target electricity selling period, and the remaining electricity of the energy storage device 50 after the electricity is sold is greater than a first preset electricity (such as the first preset electricity can be 50%, 70%, etc.).

[0069] For example, the processor 71 can divide the 24 hours of a day into 12 electricity price periods, each period includes 2 hours. The processor 71 determines that the electricity selling period is the two electricity price periods corresponding to 21:00 to 24:00, among which the selling electricity price of the electricity price period corresponding to 21:00 to 22:00 is less than the target electricity price, and the selling electricity price of the electricity price period corresponding to 23:00 to 24:00 is greater than the target electricity price. The processor 71 can use the electricity price period corresponding to 23:00 to 24:00 as the target electricity selling period, and then the processor 71 sells more than 50% of the electricity stored in the energy storage device 50 within the electricity price period corresponding to 23:00 to 24:00.

[0070] Optionally, after processor 71 determines the electricity selling period, if there is no electricity selling period in which the selling price is greater than the target electricity price, then electricity will not be sold. For example, if processor 71 determines that the electricity selling period is two electricity price periods corresponding to 9:00 PM and 12:00 AM, but the selling prices of both periods are less than the target electricity price, then processor 71 will not sell electricity.

[0071] In this way, the target electricity price is determined by the preset electricity price curve S4, and the electricity stored in the energy storage device 50 that is greater than the first preset electricity price is sold during the electricity selling period when the electricity selling price is greater than the target electricity price, thereby ensuring that the electricity selling price is relatively reasonable and increasing the user's income.

[0072] Please refer to FIG. 3 and FIG. 7 again. In some embodiments, the power management method further includes:

[0073] Step 017: Acquire weather information, and predict the second power generation of the first power generation device 30 in each power consumption period based on the weather information and the power generation curve S2 of the first power generation device 30; and

[0074] Step 018: Set a first preset power amount according to the second generated power and power consumption power in each power consumption period within a preset time period.

[0075] The weather information may include sunlight information, water level information, wind speed information, etc.

[0076] Specifically, the power generation curve S2 is generated according to the first power generation power estimated in each power usage period. The method of estimating the first power generation power in each power usage period is described in step 011 and will not be repeated here.

[0077] Weather information is obtained through the processor 71, and based on the obtained weather information and the power generation 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. It can be understood that the power generation curve S2 is the curve of the first power generation power. Since the weather will affect the power generation power of the first power generation device 30, the power generation curve S2 can be adjusted according to the weather information. For example, for the first power generation device 30 of solar power generation, cloudy weather will cause the power generation power of the first power generation device 30 to decrease, so it is necessary to adjust the power generation curve S2 accordingly, so as to obtain the power generation curve S5 corresponding to the second power generation power. According to the power generation curve S5, the second power generation power of each power consumption period can be obtained.

[0078] Then, within a preset duration (the preset duration can be 4 hours, 12 hours, 24 hours, etc.), the processor 71 can set a first preset power level based on the second generated power and power consumption of each power consumption period within the preset duration. For example, the processor 71 can calculate the power consumption and power generation of the preset duration based on the second generated power and power consumption of each power consumption period within the preset duration, and determine the first preset power level based on the difference between the power consumption and power generation. If the first preset power level is the difference, when the difference is a negative number, the first preset power level is 0%. In this way, it can be ensured that the power reserved by the energy storage device 50 can meet the power demand within the preset duration without using the power of the public power grid 400, thereby achieving self-generation and self-use.

[0079] For example, if the first power generation device 30 utilizes solar power generation, the first preset power level can be set to a smaller ratio, such as 0% or 5%, on sunny days with ample sunlight, and a larger ratio, such as 50% or 70%, on cloudy days with insufficient sunlight. For another example, if the first power generation device 30 utilizes wind power generation, the first preset power level can be set to a smaller ratio, such as 0% or 5%, on blustery days with sufficient wind, and a larger ratio, such as 50% or 70%, on breezes with relatively low winds. For another example, if the first power generation device 30 utilizes hydropower generation, the first preset power level can be set to a smaller ratio, such as 0% or 5%, on rainy days with sufficient hydropower, and a larger ratio, such as 50% or 70%, on sunny or cloudy days with relatively low hydropower.

[0080] In this way, by obtaining weather information and the power generation curve S2 of the first power generation device 30, the second power generation power of the first power generation device 30 is predicted, and within the preset time period, the first preset power is set according to the second power generation power and the power consumption in each power consumption period. On the premise of achieving self-generation and self-use of electricity, the excess electricity in the energy storage device 50 can be sold, thereby increasing the user's income.

[0081] Referring to FIG8 , in some embodiments, the power management method further includes:

[0082] Step 019: When the first generated power is less than the consumed power and the energy storage device 50 is in a power supply state, control the energy storage device 50 to supply power to the distribution device 40. The energy storage device 50 is in a power supply state including that the remaining power of the energy storage device 50 is greater than the second preset power.

[0083] Specifically, when the remaining power of the energy storage device 50 is greater than a second preset power (e.g., the second preset power may be 40%, 50%, etc.), the energy storage device 50 is in a power-supply state. At this time, the energy storage device 50 can supply power to the power distribution device 40. When the first generated power is less than (or equal to) the power consumption and the energy storage device 50 is in a power-supply state, the processor 71 can control the energy storage device 50 to supply power to the power distribution device 40, so that the power distribution device 40 can transmit power to the load 200. For example, when the power generated by the first power generation device 30 does not meet the demand of the load 200, the processor 71 can adjust the output power of the energy storage device 50 in the power-supply state, and supply the power stored in the energy storage device 50 to the power distribution device 40. The power distribution device 40 can provide power to the load 200 to meet the demand of the load 200.

[0084] In this way, by controlling the energy storage device 50 to supply power to the distribution device 40 when the first generated power is less than the consumed power and the energy storage device 50 is in a power supply state, the amount of electricity purchased by the user from the public power grid 400 can be reduced, thereby reducing the user's cost.

[0085] Referring to FIG. 9 , in some embodiments, the energy system 100 further includes a second power generation device 60 , which supplies power to the power distribution device 40 . The power management method further includes:

[0086] Step 020: When the first power generation power is less than the power consumption power and the energy storage device 50 is in a non-power supply state, 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, 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 is in a non-power supply state including that the remaining power of the energy storage device 50 is less than the third preset power.

[0087] The second power generation device 60 is a device that generates electricity by utilizing non-renewable resources in the primary energy or secondary energy, such as a fuel generator or a natural gas generator.

[0088] Specifically, the energy system 100 also includes a second power generation device 60, which can supply power to the power distribution device 40. The energy storage device 50 is provided with a third preset power level, which can be 5%, 10%, etc., and can be the power required by the target load 200 (e.g., a load 200 that needs to operate continuously). When the remaining power of the energy storage device 50 is less than the third preset power level, the energy storage device 50 is in a non-power supply state. When the energy storage device 50 is in a non-power supply state, it can only supply power to the target load 200, but cannot supply power to loads 200 other than the target load 200, and only ensures the continuous operation of the target load 200.

[0089] At this time, when the first generated power is less than (or equal to) the power consumption and the energy storage device 50 is in a state where it cannot supply power, the processor 71 can control the second generating device 60 to generate power or control the distribution device 40 to connect to the public power grid 400, so that the distribution device 40 can transmit power to the load 200, wherein the power generation cost of the second generating device 60 is greater than the power generation cost of the first generating device 30, and the power generation cost of the first generating device 30 is lower than the electricity price of the public power grid 400. For example, when the power generated by the first generating device 30 does not meet the demand of the load 200 and the energy storage device 50 is in a state where it cannot supply power, the processor 71 can control the second generating device 60 to generate power or control the distribution device 40 to connect to the public power grid 400, so that the second generating device 60 or the public power grid 400 can supply power to the distribution device 40, and then the distribution device 40 can provide power to the load 200 to meet the demand of the load 200.

[0090] In this way, when the first power generation power is less than the power consumption and the energy storage device 50 is in a non-power supply state, 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, so that power is supplied to the distribution device 40 through the second power generation device 60 or the public power grid 400, thereby meeting the power demand of the load 200.

[0091] Referring to FIG. 10 and FIG. 11 , in certain embodiments, step 020 : controlling the second power generation device 60 to generate power or controlling the power distribution device 40 to access the public power grid 400 , includes:

[0092] Step 0201: When the power generation cost of the second power generation device 60 is greater than the current electricity price of the public power grid 400 and the energy system 100 is in a grid-connected state, control the power distribution device 40 to connect to the public power grid 400;

[0093] Step 0202: When the power generation cost of the second power generation device 60 is less than the current electricity price of the public grid 400 or the energy system 100 is in an off-grid state, control the second power generation device 60 to generate electricity.

[0094] Specifically, when the power generated by the first power generation device 30 and the energy storage device 50 are in a non-power supply state, 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 electricity price of the public power grid 400 and the energy system 100 is in a grid-connected state, the power cost of connecting to the public power grid 400 is obviously lower. The processor 71 can control the power distribution device 40 to connect to the public power grid 400 and use the power supplied by the public power grid 400 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 electricity price of the public power grid 400, the electricity cost of connecting to the public power grid 400 is obviously higher, and the electricity cost of using the second power generation device 60 to generate electricity is lower. The processor 71 can control the second power generation device 60 to generate electricity, and use the electricity supplied by the second power generation device 60 to meet the needs of the load 200; or, when the energy system 100 is in an off-grid state (the off-grid state means that the energy system 100 is not connected to the public power grid 400), since the public power grid 400 cannot be used for power supply at this time, the processor 71 can only control the second power generation device 60 to generate electricity, and use the electricity supplied by the second power generation device 60 to meet the needs of the load 200.

[0095] In this way, the processor 71 controls the power distribution device 40 to access the public power grid 400 to supply power to the load 200 or controls the second power generation device 60 to generate power to supply power to the load 200, thereby achieving the lowest electricity cost, meeting the power supply needs of the load 200, and saving the user's electricity costs.

[0096] Please refer to Figure 2 again. In some embodiments, the energy system 100 also includes a second power generation device 60. 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. The distribution device 40 includes a power supply circuit 41 and a switch 42. The power supply circuit 41 is connected to the switch 42, and the switch 42 is connected to the load 200. The switch 42 is configured to control the on and off of the load 200. The first power generation device 30 and the second power generation device 60 supply power to the power supply circuit 41.

[0097] Specifically, the power generation cost of the second power generation device 60 included in the energy system 100 is greater 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 socket. The switch 42 is connected to one or more loads 200 and can control the on and off of the corresponding loads 200. The first power generation device 30 and the second power generation device 60 can supply power to the power supply circuit 41, and then the power supply circuit 41 supplies power to the load 200 corresponding to the switch 42 in the on state.

[0098] Please refer to Figure 2 again. In some embodiments, the load 200 includes a first load 210 and a second load 220. The switch 42 keeps the first load 210 powered on during each power usage period, and keeps the second load 220 powered on during the power usage period when the electricity price is less than the preset electricity price threshold, and is powered off during the power usage period when the electricity price is greater than the preset electricity price threshold. The real-time requirement of the first load 210 is greater than the real-time requirement of the second load 220.

[0099] Specifically, load 200 includes a first load 210 and a second load 220, and the real-time requirements of first load 210 are greater than those of second load 220. For example, first load 210 is a non-time-shiftable device, such as a device that must operate immediately when needed, for example, a lighting fixture, a refrigerator, etc. Maintaining power to first load 210 during each power usage period ensures that first load 210 operates immediately when needed, thus improving user experience. Second load 220 can be a time-shiftable device, such as a device that can operate normally at any time, such as a water heater. The water heater can heat at any time, and due to its heat preservation function, users can use it at any time. Maintaining power to second load 220 during power usage periods when the electricity price is less than a preset price threshold (the preset price threshold may be the average price of electricity used during each price period) can ensure that the electricity cost of second load 220 is reduced during operation, effectively saving electricity costs.

[0100] In this way, by setting the real-time power consumption of the first load 210 and the second load 220, the processor 71 can determine the first load 210 among multiple loads 200 and the second load 220 among multiple loads 200, which makes it convenient for the processor 71 to realize the on-off control of the first load 210 and the second load 220.

[0101] Referring to FIG. 2 and FIG. 12 , in certain embodiments, the power distribution device 40 further includes a first switch 421 and a second switch 422 . The first switch 421 is connected to the first power generation device 30 , and one or more second switches 422 are respectively connected to one or more loads 200 . Step 011 : Obtaining the first generated power of the first power generation device 30 and the power consumption of the one or more loads 200 includes:

[0102] Step 0111: Obtaining the first power generation of the first power generation device 30 from the first switch 421; and

[0103] Step 0112 : Obtain the power consumption of one or more loads 200 from one or more second switches 422 .

[0104] Specifically, the power distribution device 40 further includes a first switch 421 and a second switch 422, which may be smart sockets. The first switch 421 can be electrically connected to the first power generation device 30 or the second power generation device 60, thereby enabling the first switch 421 to obtain the first generated power of the first power generation device 30 or the second generated power of the second power generation device 60.

[0105] The number of the second switches 422 can be one or more, which is not limited here. One or more second switches 422 can be electrically connected to one or more loads 200, so that the second switches 422 can obtain the electrical power of the one or more loads 200.

[0106] In this way, by connecting the first switch 421 to the first power generation device 30, the first power generation power of the first power generation device 30 can be accurately obtained; by connecting the second switch 422 to the load 200, the power consumption of the load 200 can be accurately obtained.

[0107] Referring to FIG. 2 , in some embodiments, the energy management unit 80 may include a first energy management unit 81 . The first energy management unit 81 is an independent structure and is electrically connected to the power supply circuit 41 .

[0108] Specifically, in some embodiments, the first energy management unit 81 can be installed in an external environment and connected to the first power generation device 30, the first switch 421, the second switch 422 and other devices through a wired connection or a wireless connection, so that data from the first power generation device 30, the first switch 421 and the second switch 422 and other devices are transmitted to the energy management unit 80, so that the first energy management unit 81 can analyze the received data to output a control strategy. The first energy management unit 81 is independently set outside the first power generation device 30 to improve the scalability of the energy system 100. For example, when it is necessary to expand the equipment in the energy system 100 (such as the first power generation device 30, the first switch 421 and the second switch 422, etc.), it is only necessary to establish communication between the expanded equipment and the first energy management unit 81 for normal use. In addition, the first energy management unit 81 is independently arranged outside the first power generation device 30 and can be controlled and managed independently of the first power generation device 30, the first switch 421 and the second switch 422 and other equipment, thereby improving the flexibility of the first energy management unit 81, and the external first energy management unit 81 can select suitable first power generation device 30 and other equipment for control and management according to actual needs, so as to achieve reasonable configuration of energy in the energy system 100.

[0109] Referring to FIG. 2 , in some embodiments, the energy management unit 80 may include a second energy management unit 82 , which is integrated into the first power generation device 30 .

[0110] Specifically, in certain embodiments, the second energy management unit 82 can be connected to the first power generation device 30, the first switch 421, the second switch 422, and other devices via a wired or wireless connection, so that data from the first power generation device 30, the first switch 421, the second switch 422, and other devices can be transmitted to the second energy management unit 82, thereby enabling the second energy management unit 82 to analyze the received data and output a control strategy. Integrating the second energy management unit 82 into the first power generation device 30 not only avoids additional installation and wiring work, thereby simplifying the structure of the energy system 100, but also increases the speed at which the second energy management unit 82 receives data, thereby improving the response efficiency of the second energy management unit 82.

[0111] Referring to FIG. 2 and FIG. 13 , in some embodiments, the first energy management unit 81 and the second energy management unit 82 are configured to analyze received data to output a control strategy. The power management method further includes:

[0112] 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;

[0113] Step 022 : When the first energy management unit 81 is abnormal, the second energy management unit 82 takes over the first energy management unit 81 .

[0114] Specifically, the energy system 100 includes a first energy management unit 81 and a second energy management unit 82. The first energy management unit 81 and the second energy management unit 82 are configured to analyze received data and output a control strategy. The first energy management unit 81 and the second energy management unit 82 can mutually detect each other to determine whether the other is operating normally. For example, one of the first energy management unit 81 and the second energy management unit 82 sends a detection signal to the other and receives a response signal from the other. The response signal is used to determine whether the other 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 returned by the first energy management unit 81, the second energy management unit 82 can determine that the first energy management unit 81 is abnormal (for example, 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 load 200; and adjust at least part of the output power according to the total output power and the total power consumption, thereby preventing the problem of the energy system 100 being unable to work when the first energy management unit 81 is abnormal, thereby improving the stability of the energy system 100.

[0115] Please refer to Figures 2 and 14 again. The power management device 10 of the embodiment of the present application is applied 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. The power distribution device 40 is connected to the first power generation device 30, the energy storage device 50 and one or more loads 200. The first power generation device 30 supplies power to the power distribution device 40. 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 obtain the first power generation power of the first power generation device 30 and the one or more loads 200. 00's electricity consumption power; the first control module 12 is used to control the energy storage device 50 to store electricity when the first generated power is greater than the electricity consumption power; the first determination module 13 is used to determine the electricity selling period according to the preset on-grid electricity price curve S3, the on-grid electricity price curve S3 includes multiple electricity price periods, the electricity selling period is the electricity price period whose ranking meets the preset ranking among the multiple electricity price periods, and the electricity price ranking is based on the electricity selling price; the transaction module 14 is used to output the electricity of the energy storage device 50 to the power grid 400 during the electricity selling period, and make the remaining electricity of the energy storage device 50 after outputting to the power grid 400 greater than the first preset electricity.

[0116] The first determination module 13 is specifically used to determine the estimated time required to fully charge the energy storage device 50 based on the first generated power of each power consumption period, the power consumption of each power consumption period, and the remaining power of the energy storage device 50; and determine the electricity selling period based on the on-grid electricity price curve S3 within the estimated time.

[0117] The power management device 10 further includes a second determining module 15 , which is configured to determine a target electricity price according to a preset electricity price curve S4 .

[0118] The power management device 10 further includes a third determining module 16 , which is configured to determine a target electricity selling period during which the electricity selling price is greater than the target electricity price.

[0119] The transaction module 14 is specifically configured to output the power of the energy storage device 50 to the grid 400 during the target power selling period, and ensure that the remaining power of the energy storage device 50 after output to the grid 400 is greater than a first preset power.

[0120] The power management device 10 further includes a second acquisition module 17 for acquiring weather information and predicting 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 .

[0121] The power management device 10 further includes a setting module 18 , which is configured to set a first preset power level according to the second generated power and the power consumption power in each power consumption period within a preset duration.

[0122] The power management device 10 also includes a second control module 19, which is used to control the energy storage device 50 to supply power to the distribution device 40 when the first power generation power is less than the power consumption power and the energy storage device 50 is in a power supply state. The energy storage device 50 is in a power supply state when the remaining power of the energy storage device 50 is greater than the second preset power.

[0123] The power management device 10 also includes a third control module 20, which is used to control the second power generation device 60 to generate electricity or control the distribution device 40 to connect to the public power grid 400 when the first power generation power is less than the power consumption power and the energy storage device 50 is in a non-power supply state, 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 is in a non-power supply state including that the remaining power of the energy storage device 50 is less than a third preset power.

[0124] 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 electricity price of the public power grid 400 and the energy system 100 is in a grid-connected state; and to control the second power generation device 60 to generate electricity when the power generation cost of the second power generation device 60 is less than the current electricity price of the public power grid 400 or the energy system 100 is in an off-grid state.

[0125] The first acquisition module 11 is specifically configured to acquire the first generated power of the first power generating 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 .

[0126] The power management device 10 also includes a fourth determination module 21, which is used 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 by the first energy management unit 81, then the second energy management unit 82 determines that the first energy management unit 81 is abnormal.

[0127] The power management device 10 further includes a takeover module 22 , which is configured to enable the second energy management unit 82 to take over the first energy management unit 81 when the first energy management unit 81 is abnormal.

[0128] Please refer to Figure 2 again. The energy management device 70 of the embodiment of the present application includes a processor 71 and a memory 72. The memory 72 stores a computer program 73. When the computer program 73 is executed by the processor 71, it can implement the steps of the power management method of any of the above-mentioned embodiments. For the sake of brevity, they will not be repeated here.

[0129] Please refer to Figure 2 again. The energy system 100 of the embodiment of the present application includes a first power generation device 30, a distribution device 40, an energy storage device 50 and an energy management device 70. The energy management device 70 is connected to the first power generation device 30, the distribution device 40 and the energy storage device 50. The distribution device 40 is connected to the first power generation device 30, the energy storage device 50 and one or more loads 200.

[0130] 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 is connectable to the first power generation device 30, thereby enabling the energy management device 70 to obtain the power generated by the first power generation device 30. The energy management device 70 is connectable to the power distribution device 40 and the energy storage device 50, thereby enabling the energy management device 70 to control the power distribution device 40 to transmit power to the energy storage device 50. By connecting the power distribution device 40 to the first power generation device 30, the energy storage device 50, and one or more loads 200, 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.

[0131] Please refer to Figure 15. The embodiment of the present application also provides a computer-readable storage medium 300, on which a computer program 310 is stored. When the computer program 310 is executed by the processor 320, the steps of the power management method of any of the above-mentioned embodiments are implemented. For the sake of brevity, they are not repeated here.

[0132] In the description of this specification, the reference terms "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0133] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0134] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for power management, wherein: Applied to an energy system, 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, the energy storage device and one or more loads, the first power generation device supplies power to the power distribution device, and the method includes: Acquire a first power generation power of the first power generation device and power consumption of the one or more loads; When the first generated power is greater than the power consumption, controlling the energy storage device to store power; Determine a power selling period according to a preset on-grid power price curve, wherein the on-grid power price curve includes a plurality of power price periods, and the power selling period is a power price period whose power price ranking satisfies a preset ranking among the plurality of power price periods, and the power price ranking is based on the power selling price; The power of the energy storage device is output to the power grid during the power selling period, and the remaining power of the energy storage device after the output to the power grid is greater than a first preset power.

2. The power management method according to claim 1, wherein: The step of determining the electricity selling period according to the preset on-grid electricity price curve includes: Determine an estimated time required to fully charge the energy storage device according to 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; The electricity selling period is determined according to the on-grid electricity price curve within the estimated duration.

3. The power management method according to claim 1, wherein: Also includes: Determine the target electricity price based on the preset electricity price curve; Determine a target electricity selling period during the electricity selling period in which the electricity selling price is greater than the target electricity consumption price; The method of outputting the power of the energy storage device to the power grid during the power selling period, and making the remaining power of the energy storage device after the power is output to the power grid greater than a first preset power, comprises: The power of the energy storage device is output to the power grid during the target power selling period, and the remaining power of the energy storage device after the output to the power grid is greater than the first preset power.

4. The power management method according to claim 3, wherein: The on-grid electricity price curve is obtained based on historical on-grid electricity price forecasts, and the electricity consumption price curve is obtained based on historical electricity consumption price forecasts.

5. The power management method according to any one of claims 2 to 4, wherein: Also includes: Acquire weather information, and predict the second power generation of the first power generation device in each power consumption period according to the weather information and the power generation curve of the first power generation device; and The first preset power is set according to the second generated power and the power consumption in each power consumption period within a preset time period.

6. The power management method according to claim 1, wherein: Also includes: When the first power generation power is less than the power consumption power and the energy storage device is in a power supplyable state, the energy storage device is controlled to supply power to the power distribution device, and the energy storage device being in a power supplyable state includes that the remaining power of the energy storage device is greater than a second preset power.

7. The power management method according to claim 1, wherein: The energy system further includes a second power generation device, the second power generation device supplies power to the power distribution device, and the method further includes: When the first power generation power is less than the power consumption power and the energy storage device is in a state where it cannot supply power, the second power generation device is controlled to generate power or the distribution device is controlled to connect to the public power grid, 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 is in a state where it cannot supply power includes that the remaining power of the energy storage device is less than a third preset power.

8. The power management method according to claim 7, wherein: The controlling the second power generation device to generate power or controlling the power distribution device to access the public power grid comprises: When the power generation cost of the second power generation device is greater than the current electricity price of the public power grid and the energy system is in a grid-connected state, controlling the power distribution device to connect to the public power grid; When the power generation cost of the second power generation device is less than the current electricity price of the public power grid or the energy system is in an off-grid state, the second power generation device is controlled to generate power.

9. According to the power management method according to claim 1, the energy system also includes a second power generation device, the power generation cost of the second power generation device is greater than the power generation cost 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, the switch is configured to control the on and off of the load, and the first power generation device and the second power generation device supply power to the power supply circuit.

10. The power management method according to claim 9, wherein: The load includes a first load and a second load. The switch enables the first load to remain powered on during each power usage period, and enables the second load to be powered on during a power usage period when the electricity price is less than a preset electricity price threshold, and to be powered off during a power usage period when the electricity price is greater than the preset electricity price threshold. The real-time requirement of the first load is greater than the real-time requirement of the second load.

11. The power management method according to claim 1, wherein: The power distribution device further includes a first switch and a second switch, the first switch is connected to the first power generation device, the one or more second switches are respectively connected to the one or more loads, and the obtaining of the first power generation power of the first power generation device and the power consumption of the one or more loads includes: obtaining the first power generation of the first power generation device from the first switch, and The electrical power of the one or more loads is obtained from the one or more second switches respectively.

12. The power management method according to claim 1, wherein: The energy system further includes an energy management unit, wherein the energy management unit includes a first energy management unit, wherein the first energy management unit is an independent structure and is electrically connected to the power supply circuit; and / or The energy management unit includes a second energy management unit, and the second energy management unit is integrated in the first power generation device.

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

14. A power management device, wherein: Applied to an energy system, 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, 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, used to acquire the first power generation power of the first power generation device and the power consumption of the one or more loads; A first control module, configured to control the energy storage device to store electricity when the first generated power is greater than the consumed power; A first determination module is used to determine a power selling period according to a preset on-grid power price curve, wherein the on-grid power price curve includes a plurality of power price periods, and the power selling period is a power price period whose power price ranking satisfies a preset ranking among the plurality of power price periods, and the power price ranking is based on the power selling price; The transaction module is used to output the power of the energy storage device to the power grid during the power selling period, and make the remaining power of the energy storage device after output to the power grid greater than a first preset power.

15. An energy management device, wherein: include: processor; and A memory storing a computer program, wherein the computer program implements the steps of the power management method according to any one of claims 1 to 13 when executed by the processor.

16. An energy system, wherein: It comprises a first power generation device, a power distribution device, an energy storage device and the energy management device according to claim 12, wherein the energy management device is connected to the first power generation device, the power distribution device and the energy storage device, and the power distribution device is connected to the first power generation device, the energy storage device and one or more loads. 17 . A non-volatile computer-readable storage medium containing a computer program, wherein when the computer program is executed by a processor, the processor executes the power management method according to claim 1 .

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