Control method, optical storage charging source system, computer equipment and computer medium

Abstract

The invention discloses a control method of an optical storage charging source system, the optical storage charging source system, computer equipment and a computer readable storage medium. The optical storage charging source system comprises a photovoltaic unit, an energy storage unit, a direct current charging pile and an uninterruptible power supply, and the control method comprises the following steps: determining a power supply strategy of the photovoltaic unit and the energy storage unit for supplying power to the direct current charging pile and the uninterruptible power supply according to the output power of the photovoltaic unit and the total required power of the optical storage charging source system, the total demanded power is the sum of the demanded power of the direct current charging pile and the demanded power of the uninterruptible power supply. According to the control method, the power supply source of the direct current charging pile and / or the uninterruptible power supply is determined according to the output power of the photovoltaic unit and the total demand power of the optical storage charging source system, so that the photovoltaic unit and the energy storage unit can jointly control the charging of the direct current charging pile and the uninterruptible power supply.

Description

Technical Field

[0001] This application relates to the field of optical energy storage and charging system technology, and more specifically, to a control method for an optical energy storage and charging power supply system, an optical energy storage and charging power supply system, a computer device, and a computer-readable storage medium. Background Technology

[0002] A photovoltaic-energy storage-charging system is a green charging system that integrates photovoltaic power generation, energy storage, and charging functions. Uninterruptible power supplies (UPS) require continuous power supply; using photovoltaic and energy storage systems to power UPS systems enables green power supply. However, current technologies lack a strategy for the joint control of photovoltaic and energy storage systems for DC charging piles and UPS charging. Summary of the Invention

[0003] This application provides a control method for a photovoltaic energy storage power supply system, a photovoltaic energy storage power supply system, a computer device, and a computer-readable storage medium.

[0004] This application provides a control method for a photovoltaic-storage-charging power supply system. The photovoltaic-storage-charging power supply system includes a photovoltaic unit, an energy storage unit, a DC charging pile, and an uninterruptible power supply. The photovoltaic unit and the energy storage unit are respectively electrically connected to a DC-DC conversion unit. The DC-DC conversion unit is respectively electrically connected to the DC charging pile and a DC-AC conversion unit. The DC-AC conversion unit is electrically connected to the uninterruptible power supply. The control method includes:

[0005] Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power supply system, a power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply is determined, wherein the total power demand is the sum of the power demand of the DC charging pile and the power demand of the uninterruptible power supply.

[0006] Thus, the control method, photovoltaic-storage-charging power supply system, computer equipment, and computer-readable storage medium of the embodiments of this application determine the source of power supply to the DC charging pile and / or uninterruptible power supply based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power supply system, so as to achieve joint control of the power supply from the photovoltaic unit and the energy storage unit to the DC charging pile and the uninterruptible power supply.

[0007] In some embodiments, determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-energy storage-charging power source system includes:

[0008] If the output power of the photovoltaic unit is greater than or equal to the total power demand, the power supply strategy is determined to be to control the photovoltaic unit to supply power.

[0009] If the output power of the photovoltaic unit is less than the total power demand, the power supply strategy is determined to include controlling the photovoltaic unit and the energy storage unit to supply power.

[0010] Thus, based on the comparison between the output power of the photovoltaic unit and the total power demand, it can be determined whether only the photovoltaic unit needs to provide power, or whether both the photovoltaic unit and the energy storage unit need to provide power.

[0011] In some embodiments, determining the power supply strategy when the output power of the photovoltaic unit is less than the total power demand includes controlling the photovoltaic unit and the energy storage unit to supply power, including:

[0012] If the sum of the output power of the photovoltaic unit and the output power of the energy storage unit is greater than or equal to the total power demand, the power supply strategy is determined to be: control the photovoltaic unit and the energy storage unit to supply power;

[0013] If the sum of the output power of the photovoltaic unit and the output power of the energy storage unit is less than the total power demand, the power supply strategy is determined to be: control the power grid connected to the photovoltaic unit, the energy storage unit and the photovoltaic-energy storage-charging power system to supply power.

[0014] In this way, by comparing the sum of the output power of the photovoltaic unit and the output power of the energy storage unit with the total power demand, it can be determined whether it is necessary to draw on the grid's power in addition to controlling the photovoltaic unit and the energy storage unit to supply power.

[0015] In some embodiments, when the output power of the photovoltaic unit is greater than or equal to the total power demand, the control method further includes:

[0016] If the output power of the photovoltaic unit is greater than the sum of the input power of the energy storage unit and the total demand power, the photovoltaic unit is controlled to supply power to the energy storage unit and to the power grid connected to the photovoltaic-energy storage-charging power system.

[0017] Thus, when the output power of the photovoltaic unit is greater than the sum of the input power of the energy storage unit and the total demand power, in addition to the uninterruptible power supply and DC charging pile, the photovoltaic unit can also control the power supply of the energy storage unit and the grid connected to the photovoltaic-storage-charging power source system.

[0018] In some embodiments, when the output power of the photovoltaic unit is greater than or equal to the total power demand, the control method further includes:

[0019] If the output power of the photovoltaic unit is less than or equal to the sum of the input power of the energy storage unit and the total demand power, the photovoltaic unit is controlled to supply power to the energy storage unit.

[0020] Thus, when the output power of the photovoltaic unit is less than or equal to the sum of the input power of the energy storage unit and the total demand power, the energy storage power supply can store all the remaining electrical energy of the photovoltaic unit. Therefore, the photovoltaic unit can be controlled to supply power to the energy storage unit to store the remaining electrical energy.

[0021] In some embodiments, when the output power of the photovoltaic unit is greater than the total power demand, controlling the photovoltaic unit to supply power to the energy storage unit includes:

[0022] If the state of charge of the energy storage unit is less than a first threshold, the photovoltaic unit is controlled to charge the energy storage unit.

[0023] Thus, based on the state of charge of the energy storage unit and the first threshold, it can be determined whether the energy storage unit can be used for charging at this time, so that if it can be charged, the photovoltaic unit can be controlled to charge the energy storage unit.

[0024] In some embodiments, controlling the photovoltaic unit to supply power to the energy storage unit includes:

[0025] If the state of charge of the energy storage unit is less than the second threshold, the power grid connected to the photovoltaic unit and the photovoltaic-storage-charging power source system is controlled to charge the energy storage unit, where the first threshold is greater than the second threshold.

[0026] Thus, based on the state of charge of the energy storage battery and the second threshold, it can be determined whether it is necessary to draw on the grid's power to charge the energy storage unit together with the photovoltaic unit.

[0027] In some embodiments, determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-energy storage-charging power source system includes:

[0028] Based on the output power of the photovoltaic unit, the total power demand of the photovoltaic-storage-charging power supply system, and the operating status of the DC charging pile, the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply is determined.

[0029] Therefore, by incorporating the operating status of DC charging piles into the parameters for determining the power supply strategy, the power supply strategy can be determined more accurately.

[0030] In some embodiments, when the DC charging pile is operating, determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit, the total power demand of the photovoltaic-energy storage-charging power source system, and the operating status of the DC charging pile includes:

[0031] If the DC charging pile is not in operation, it is determined that no power will be supplied to the DC charging pile;

[0032] Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power source system, a power supply unit for supplying power to the uninterruptible power supply is determined. The power supply unit includes the photovoltaic unit, the energy storage unit, and the power grid connected to the photovoltaic-storage-charging power source system.

[0033] Thus, when the DC charging pile is not in operation, the power supply unit for the uninterruptible power supply can be determined based on the output power of the photovoltaic unit and the power demand of the uninterruptible power supply.

[0034] In some embodiments, when the DC charging pile is operating, determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit, the total power demand of the photovoltaic-energy storage-charging power source system, and the operating status of the DC charging pile includes:

[0035] If the DC charging pile is not in operation, it is determined that no power will be supplied to the DC charging pile;

[0036] Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power source system, a power supply unit is determined to supply power to the uninterruptible power supply and the DC charging pile. The power supply unit includes the power grid to which the photovoltaic unit, the energy storage unit, and the photovoltaic-storage-charging power source system are connected.

[0037] Thus, when the DC charging pile is in operation, the power supply units for the uninterruptible power supply and the DC charging pile can be determined based on the output power of the photovoltaic unit and the total power demand.

[0038] This application provides a photovoltaic-storage-charging power supply system, which includes a photovoltaic unit, an energy storage unit, a DC charging pile, an uninterruptible power supply (UPS), and a controller. The photovoltaic unit and the energy storage unit are electrically connected to a DC-DC conversion unit, which is electrically connected to both the DC charging pile and a DC-AC conversion unit. The DC-AC conversion unit is electrically connected to the UPS. The controller is configured as follows:

[0039] Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power supply system, a power supply strategy for the photovoltaic unit and energy storage unit to supply power to the DC charging pile and the uninterruptible power supply is determined, wherein the total power demand is the sum of the power demand of the DC charging pile and the power demand of the uninterruptible power supply.

[0040] This application provides a computer device that includes one or more processors and a memory. The memory stores a computer program that, when executed by the processor, implements the steps of the control method as described in any of the above embodiments.

[0041] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method as described in any of the above embodiments.

[0042] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0043] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0044] Figure 1 This is a flowchart illustrating the control method of some embodiments of this application;

[0045] Figure 2 This is a schematic diagram of a photovoltaic energy storage and charging power supply system according to certain embodiments of this application;

[0046] Figure 3 This is a schematic diagram of a photovoltaic energy storage and charging power supply system according to certain embodiments of this application;

[0047] Figure 4 This is a flowchart illustrating the control method of some embodiments of this application;

[0048] Figure 5 This is a flowchart illustrating the control method of some embodiments of this application;

[0049] Figure 6 This is a flowchart illustrating the control method of some embodiments of this application;

[0050] Figure 7 This is a flowchart illustrating the control method of some embodiments of this application;

[0051] Figure 8 This is a flowchart illustrating the control method of some embodiments of this application;

[0052] Figure 9 This is a flowchart illustrating the control method of some embodiments of this application;

[0053] Figure 10 This is a flowchart illustrating the control method of some embodiments of this application;

[0054] Figure 11 This is a schematic diagram of a photovoltaic energy storage and charging power supply system according to certain embodiments of this application. Detailed Implementation

[0055] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote 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 this application, and should not be construed as limiting this application.

[0056] Uninterruptible power supplies (UPS) require continuous power supply. Using photovoltaic (PV) systems and energy storage systems to power UPS systems can achieve green power supply. However, current technologies lack strategies for the joint control of PV systems and energy storage systems for charging DC charging piles and UPS systems.

[0057] Based on the above-mentioned issues that need to be resolved, please refer to Figure 1 and Figure 2 This application provides a control method for a photovoltaic-storage-charging power supply system 100. The photovoltaic-storage-charging power supply system 100 includes an energy storage unit 10, a DC charging pile 30, an uninterruptible power supply 50, and a photovoltaic unit 70. The photovoltaic unit 70 and the energy storage unit 10 are electrically connected to a DC-DC conversion unit 20, which is electrically connected to the DC charging pile 30 and a DC-AC conversion unit 40. The DC-AC conversion unit 40 is electrically connected to the uninterruptible power supply 50. The control method includes:

[0058] 01: Based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power supply system 100, determine the power supply strategy for the photovoltaic unit 70 and the energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50. The total power demand is the sum of the power demand of the DC charging pile 30 and the power demand of the uninterruptible power supply 50. The photovoltaic unit 70 is connected to the DC charging pile 30 and the uninterruptible power supply 50.

[0059] This application provides a computer device, which includes one or more processors and a memory. The memory stores a computer program that can be executed by the processor. The processor can be used to determine a power supply strategy for the photovoltaic unit 70 and the energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-energy storage-charging power source system 100.

[0060] This application provides a control device, which includes a determining module. The determining module can be used to determine a power supply strategy for supplying power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power source system 100. The total power demand is the sum of the power demand of the DC charging pile 30 and the power demand of the uninterruptible power supply 50.

[0061] Specifically, in related technologies, a photovoltaic-energy storage-charging system is a green charging system that integrates photovoltaic power generation, energy storage, and charging functions. Specifically, the system converts solar energy into direct current (DC) through solar panels, and then converts the DC to alternating current (AC) through an inverter to supply power to households or electric vehicles. Simultaneously, the energy storage device in the system stores excess electrical energy, which can be released to the grid or to charge electric vehicles when needed.

[0062] Please see Figure 2 and Figure 3 In this embodiment, the photovoltaic-storage-charging power supply system 100 includes an energy storage unit 10, a DC-DC conversion unit 20, a DC charging pile 30, a DC-AC conversion unit 40, and an uninterruptible power supply 50. The energy storage unit 10 can store electrical energy and also release the stored electrical energy to supply power. The uninterruptible power supply 50 and the DC charging pile 30 are also connected to the photovoltaic unit 70 to receive the electrical energy obtained by the photovoltaic unit 70 from the conversion of solar energy.

[0063] The photovoltaic unit 70 is connected to the DC charging pile 30 via a DC-DC converter 20. The DC-DC converter 20 converts the DC voltage generated by the photovoltaic unit 70 to a suitable voltage before supplying it to the DC charging pile 30. The energy storage unit 10 is also connected to the DC charging pile 30 via the DC-DC converter 20. The DC-DC converter 20 converts the electrical energy from the energy storage unit 10 to a suitable voltage before supplying it to the DC charging pile 30. The DC-DC converter 20 can also process the DC power output from the photovoltaic unit 10 and then output it to the energy storage unit 10 to charge it.

[0064] The DC-DC converter 20 is also connected to the DC-AC converter 40, which is connected to both the power grid 300 and the uninterruptible power supply 50. The DC-AC converter 40 converts the DC output from the DC-DC converter 20 into AC power and supplies it to the uninterruptible power supply 50. The DC-AC converter 40 can also convert the AC power from the power grid 300 into DC power and input it into the DC-DC converter 20. The DC-DC converter 20 performs voltage conversion on the input DC power and outputs it to the energy storage unit 10 to charge the energy storage unit 10.

[0065] The uninterruptible power supply 50 requires uninterrupted power supply, and the required power of the uninterruptible power supply 50 can be the input power of the uninterruptible power supply 50; the DC charging pile 30 also needs to be powered during operation, and the required power of the DC charging pile 30 can be the input power of the DC charging pile 30. The required power of the uninterruptible power supply 50 and the required power of the DC charging pile 30 constitute the total required power of the photovoltaic energy storage charging power system 100.

[0066] Because the photovoltaic unit 70 has a low power output during certain periods, it cannot independently support the power supply of the uninterruptible power supply 50. Therefore, it is necessary to determine the power supply strategy for the uninterruptible power supply and the DC charging pile 30 based on the output power of the photovoltaic unit 70 and the total power demand, in order to ensure the power supply for the uninterruptible power supply and the DC charging pile 30. For example, when the output power of the photovoltaic unit 70 is low, it cannot support the power supply for the uninterruptible power supply 50 and the DC charging pile 30. In this case, the power grid 300 connected to the energy storage unit 10 and / or the photovoltaic-storage-charging power source system 100 needs to work together with the photovoltaic unit 70 to supply power to the uninterruptible power supply 50 and the DC charging pile 30.

[0067] In one embodiment, if the output power of the photovoltaic unit 70 is greater than the total required power, then the photovoltaic unit 70 is controlled to supply power to the uninterruptible power supply 50 and the DC charging pile 30.

[0068] In another embodiment, if the output power of the photovoltaic unit 70 is less than the total required power, then the photovoltaic unit 70 and the energy storage unit 10 are controlled to jointly supply power to the uninterruptible power supply 50 and the DC charging pile 30.

[0069] The control method described in this application can be applied to residential scenarios such as homes and hotels to achieve full utilization of photovoltaic energy, and under ideal conditions, achieve self-sufficiency in electricity. Furthermore, the control method described in this application can also be applied to other photovoltaic-storage-charging + uninterruptible power supply application scenarios, and is not limited thereto.

[0070] Thus, the control method, computer equipment, and computer-readable storage medium of the present application determine the source of power supply to the DC charging pile 30 and / or the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power supply system 100, so as to achieve joint control of the power supply from the photovoltaic unit 70 and the energy storage unit 10 to the DC charging pile 30 and the uninterruptible power supply 50.

[0071] Please see Figure 4 In some embodiments, step 01 (determining the power supply strategy for the photovoltaic unit 70 and energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power source system 100) includes:

[0072] 011: When the output power of photovoltaic unit 70 is greater than or equal to the total power demand, the power supply strategy is determined to be to control photovoltaic unit 70 to supply power;

[0073] 012: When the output power of the photovoltaic unit 70 is less than the total required power, the power supply strategy is determined to include controlling the photovoltaic unit 70 and the energy storage unit 10 to supply power.

[0074] In some embodiments, the processor can be used to determine a power supply strategy of controlling the photovoltaic unit 70 to supply power when the output power of the photovoltaic unit 70 is greater than or equal to the total power demand; and to determine a power supply strategy including controlling the photovoltaic unit 70 and the energy storage unit 10 to supply power when the output power of the photovoltaic unit 70 is less than the total power demand.

[0075] In some embodiments, the determining module includes a first determining submodule and a second determining submodule. The first determining submodule can be used to determine a power supply strategy of controlling the photovoltaic unit 70 to supply power when the output power of the photovoltaic unit 70 is greater than or equal to the total power demand. The second determining submodule can be used to determine a power supply strategy including controlling both the photovoltaic unit 70 and the energy storage unit 10 to supply power when the output power of the photovoltaic unit 70 is less than the total power demand.

[0076] Specifically, the output power of the photovoltaic unit 70 can be represented by P0, the output power of the energy storage unit 10 can be represented by P1, the total power demand can be represented by P, the power demand of the uninterruptible power supply 50 can be represented by P2, and the power demand of the DC charging pile 30 can be represented by P3, that is, P = P2 + P3.

[0077] When the output power of the photovoltaic unit 70 is greater than or equal to the total power demand, i.e., P0≥P, the output power of the photovoltaic unit 70 is sufficient to supply power to the DC charging pile 30 and the uninterruptible power supply 50. Therefore, there is no need to use the electrical energy stored in the energy storage unit 10 and the electrical energy of the grid 300. The photovoltaic unit 70 alone can support the electrical energy demand of the DC charging pile 30 and the uninterruptible power supply 50.

[0078] When the output power of photovoltaic unit 70 is less than the total power demand (i.e., P0 < P), the output power of photovoltaic unit 70 is insufficient to supply power to DC charging pile 30 and uninterruptible power supply 50. In this case, the energy storage unit 10 needs to be used to supply power to DC charging pile 30 and uninterruptible power supply 50, i.e., switching energy storage unit 10 to output mode. At this time, energy storage unit 10 is in output mode and monitors the output power of photovoltaic unit 70 in real time to adjust the output, ensuring that the sum of the output power of energy storage unit 10 and photovoltaic unit 70 meets the total power demand. If the sum of the output power of energy storage unit 10 and photovoltaic unit 70 is also insufficient to meet the total power demand, then the power from the grid 300 needs to be used to supplement the demand of DC charging pile 30 and uninterruptible power supply 50, ensuring that P0 + P1 + P5 ≥ P, where P5 is the power of grid 300.

[0079] Thus, based on the comparison between the output power of the photovoltaic unit 70 and the total power demand, it is determined whether only the photovoltaic unit 70 needs to provide power, or whether the photovoltaic unit 70 and the energy storage unit 10 need to provide power together.

[0080] Please see Figure 5 In some embodiments, step 012 (determining the power supply strategy, including controlling the photovoltaic unit 70 and the energy storage unit 10 to supply power when the output power of the photovoltaic unit 70 is less than the total power demand) includes:

[0081] 0121: If the sum of the output power of photovoltaic unit 70 and the output power of energy storage unit 10 is greater than or equal to the total power demand, the power supply strategy is determined as follows: control photovoltaic unit 70 and energy storage unit 10 to supply power.

[0082] 0122: If the sum of the output power of photovoltaic unit 70 and the output power of energy storage unit 10 is less than the total power demand, the power supply strategy is determined as follows: control the power grid 300 connected to photovoltaic unit 70, energy storage unit 10 and photovoltaic-storage-charging power system 100 to supply power.

[0083] In some embodiments, the processor can be used to determine the power supply strategy as follows: control the photovoltaic unit 70 and the energy storage unit 10 to supply power if the sum of the output power of the photovoltaic unit 70 and the output power of the energy storage unit 10 is greater than or equal to the total power demand; and to determine the power supply strategy as follows: control the power grid 300 connected to the photovoltaic unit 70, the energy storage unit 10 and the photovoltaic-storage-charging power system 100 to supply power if the sum of the output power of the photovoltaic unit 70 and the output power of the energy storage unit 10 is less than the total power demand.

[0084] In some embodiments, the second determining submodule includes a first determining unit and a second determining unit. The first determining unit can be used to determine the power supply strategy as follows: if the sum of the output power of the photovoltaic unit 70 and the output power of the energy storage unit 10 is greater than or equal to the total power demand, the power supply strategy is to control the photovoltaic unit 70 and the energy storage unit 10 to supply power. The second determining unit can be used to determine the power supply strategy as follows: if the sum of the output power of the photovoltaic unit 70 and the output power of the energy storage unit 10 is less than the total power demand, the power supply strategy is to control the power grid 300 connected to the photovoltaic unit 70, the energy storage unit 10, and the photovoltaic-energy storage-charging power system 100 to supply power.

[0085] Specifically, when the output power of the photovoltaic unit 70 is less than the total power demand, the energy storage unit 10 and the photovoltaic unit 70 need to work together to supply power to the uninterruptible power supply 50 and the DC charging pile 30. However, if the output power of the energy storage unit 10 is insufficient to supplement the power demand that the photovoltaic unit 70 cannot provide, then the power grid 300 also needs to be controlled to charge the uninterruptible power supply 50 and the DC charging pile 30.

[0086] Therefore, it is necessary to compare the sum of the output power of the photovoltaic unit 70 and the output power of the energy storage unit 10 with the total power demand to determine whether it is necessary to draw power from the grid 300.

[0087] When the output power of photovoltaic unit 70 is less than the total power demand, and the sum of the output power of photovoltaic unit 70 and the output power of energy storage unit 10 is greater than or equal to the total power demand, then P0 + P1 ≥ P, meaning the output power of photovoltaic unit 70 and the output power of energy storage unit 10 are sufficient to meet the total power demand. Therefore, the power supply strategy for uninterruptible power supply 50 and DC charging pile 30 is determined to be to control photovoltaic unit 70 and energy storage unit 10 to supply power.

[0088] When the output power of photovoltaic unit 70 is less than the total power demand, and the sum of the output power of photovoltaic unit 70 and the output power of energy storage unit 10 is less than the total power demand, P0 + P1 < P. Therefore, the output power of photovoltaic unit 70 and energy storage unit 10 alone cannot meet the total power demand. Thus, the power supply strategy for uninterruptible power supply 50 and DC charging pile 30 is determined to control the power grid 300 connected to photovoltaic unit 70, energy storage unit 10, and the photovoltaic-energy storage-charging power source system 100 to supply power.

[0089] In some implementations, the power grid 300 and the uninterruptible power supply 50 are connected via a switching unit. When P0+P1<P, the controller 90 of the photovoltaic-storage-charging power supply system 100 controls the switching unit to close, thereby controlling the power grid 300 to supply power to the uninterruptible power supply 50.

[0090] In this way, by comparing the sum of the output power of the photovoltaic unit 70 and the output power of the energy storage unit 10 with the total power demand, it can be determined whether it is necessary to draw on the power grid 300 in addition to controlling the photovoltaic unit 70 and the energy storage unit 10 to supply power.

[0091] Please see Figure 6 In some embodiments, when the output power of the photovoltaic unit 70 is greater than or equal to the total power demand, the control method further includes:

[0092] 02: If the output power of the photovoltaic unit 70 is greater than the sum of the input power of the energy storage unit 10 and the total demand power, control the photovoltaic unit 70 to supply power to the grid 300 connected to the energy storage unit 10 and the photovoltaic-storage-charging power system 100.

[0093] In some implementations, the processor can be used to control the photovoltaic unit 70 to supply power to the grid 300 to which the energy storage unit 10 and the photovoltaic-storage-charging power system 100 are connected if the output power of the photovoltaic unit 70 is greater than the sum of the input power of the energy storage unit 10 and the total power demand.

[0094] In some embodiments, the control device further includes a first control module. The first control module can be used to control the photovoltaic unit 70 to supply power to the grid 300 to which the energy storage unit 10 and the photovoltaic-storage-charging power system 100 are connected if the output power of the photovoltaic unit 70 is greater than the sum of the input power of the energy storage unit 10 and the total demand power.

[0095] Specifically, the input power of the energy storage unit 10 can be used to characterize the rechargeable capacity of the energy storage unit 10, and the input power of the energy storage unit 10 can be represented by P4. When the output power of the photovoltaic unit 70 is greater than the total power demand, the electrical energy converted by the photovoltaic unit 70 is sufficient to support the power demand of the uninterruptible power supply 50 and the DC charging pile 30, and there is a surplus, which can be used for other purposes.

[0096] Since the energy storage unit 10 can store electrical energy, when there is surplus electrical energy obtained from the photovoltaic unit 70 and the energy storage unit 10 can be charged, the surplus electrical energy can be stored. When the output power of the photovoltaic unit 70 is low, the electrical energy stored in the energy storage unit 10 can be output to supply power to loads such as the uninterruptible power supply 50 and the DC charging pile 30.

[0097] When the output power of the photovoltaic unit 70 is greater than the sum of the input power of the energy storage unit 10 and the total demand power, then P0 > P2 + P3 + P4. After providing the total demand power and the input power of the energy storage unit 10, the output power of the photovoltaic unit 70 still has surplus, which can be used to supply power to the grid 300 connected to the photovoltaic-storage-powered power supply, so as to make full use of the electrical energy obtained by the photovoltaic unit 70.

[0098] Thus, when the output power of the photovoltaic unit 70 is greater than the sum of the input power of the energy storage unit 10 and the total demand power, in addition to supplying the uninterruptible power supply 50 and the DC charging pile 30, the photovoltaic unit 70 can also be controlled to supply power to the grid 300 connected to the energy storage unit 10 and the photovoltaic-storage-charging power system 100.

[0099] Please see Figure 6 In some embodiments, when the output power of the photovoltaic unit 70 is greater than or equal to the total power demand, the control method further includes:

[0100] 03: If the output power of the photovoltaic unit 70 is less than or equal to the sum of the input power of the energy storage unit 10 and the total demand power, control the photovoltaic unit 70 to supply power to the energy storage unit 10.

[0101] In some implementations, the processor can be used to control the photovoltaic unit 70 to supply power to the energy storage unit 10 if the output power of the photovoltaic unit 70 is less than or equal to the sum of the input power of the energy storage unit 10 and the total demand power.

[0102] In some embodiments, the control device further includes a second control module. The second control module can be used to control the photovoltaic unit 70 to supply power to the energy storage unit 10 if the output power of the photovoltaic unit 70 is less than or equal to the sum of the input power of the energy storage unit 10 and the total power demand.

[0103] Specifically, when the output power of the photovoltaic unit 70 is greater than or equal to the total demand power and less than or equal to the total demand power, P2+P3<P0 and P0≤P2+P3+P4, the remaining electrical energy after the output power of the photovoltaic unit 70 provides the total demand power is insufficient to fully charge the energy storage unit 10, or there is no additional electrical energy remaining after fully charging the energy storage unit 10. That is, the energy storage unit 10 can store all the remaining electrical energy of the photovoltaic unit 70 at this time. Therefore, in addition to supplying power to the uninterruptible power supply 50 and the DC charging pile 30, the photovoltaic unit 70 can also supply power to the energy storage unit 10 to charge the energy storage unit 10, thereby storing the remaining electrical energy of the photovoltaic unit 70.

[0104] Thus, when the output power of the photovoltaic unit 70 is less than or equal to the sum of the input power of the energy storage unit 10 and the total demand power, the energy storage power supply can store all the remaining electrical energy of the photovoltaic unit 70. Therefore, the photovoltaic unit 70 can be controlled to supply power to the energy storage unit 10 to store the remaining electrical energy.

[0105] Please see Figure 7In some embodiments, when the output power of the photovoltaic unit 70 is greater than the total required power, the "controlling the photovoltaic unit 70 to supply power to the energy storage unit 10" in step 02 or step 03 includes:

[0106] 031: If the state of charge of energy storage unit 10 is less than the first threshold, control photovoltaic unit 70 to charge energy storage unit 10.

[0107] In some implementations, the processor can be used to control the photovoltaic unit 70 to charge the energy storage unit 10 if the state of charge of the energy storage unit 10 is less than a first threshold.

[0108] In some embodiments, the second control module includes a first control submodule. The first control submodule can be used to control the photovoltaic unit 70 to charge the energy storage unit 10 if the state of charge of the energy storage unit 10 is less than a first threshold.

[0109] Specifically, when the output power of the photovoltaic unit 70 exceeds the total power demand, the electricity obtained by the photovoltaic unit 70 will still have surplus energy after supplying power to the uninterruptible power supply 50 and the DC charging pile 30. This surplus energy can charge the energy storage unit 10 for storage. However, the energy storage unit 10 may already be saturated, making it impossible or unnecessary to charge it. Therefore, it is necessary to determine the charge status of the energy storage unit 10.

[0110] The energy storage unit 10 includes an energy storage battery, and the state of charge (SOC) of the energy storage battery can be used to characterize the battery's electrical state. A first threshold is a pre-set SOC value, which can be used to characterize whether the energy storage battery can be charged.

[0111] Thus, based on the state of charge of the energy storage unit 10 and the first threshold, it can be determined whether the energy storage unit 10 can be used for charging at this time, so that if it can be charged, the photovoltaic unit 70 can be controlled to charge the energy storage unit 10.

[0112] Please see Figure 7 In some embodiments, "controlling the photovoltaic unit 70 to supply power to the energy storage unit 10" in step 02 or step 03 includes:

[0113] 032: If the state of charge of energy storage unit 10 is less than the second threshold, the grid 300 connected to the photovoltaic unit 70 and the photovoltaic-storage-charging power source system 100 charges the energy storage unit 10, and the second threshold is less than the first threshold.

[0114] In some implementations, the processor can be used to control the power grid 300, to which the photovoltaic unit 70 and the photovoltaic-storage-charging power supply system 100 are connected, to charge the energy storage unit 10 if the state of charge of the energy storage unit 10 is less than a second threshold, wherein the second threshold is less than a first threshold.

[0115] In some embodiments, the second control module may include a second control submodule. The second control submodule may be used to control the power grid 300, to which the photovoltaic unit 70 and the photovoltaic-storage-charging power source system 100 are connected, to charge the energy storage unit 10 if the state of charge of the energy storage unit 10 is less than a second threshold.

[0116] Specifically, the second threshold is a pre-set SOC value, and the first threshold is greater than the second threshold. The second threshold can be used to indicate whether the energy storage battery has too low a charge and needs to be recharged. Both the first and second thresholds can be set according to actual needs.

[0117] When the SOC of the energy storage battery is less than the first threshold and greater than the second threshold, the energy storage unit 10 can be charged. Since the state of charge is not too low and emergency charging is unnecessary, the photovoltaic unit 70 can be controlled to charge the energy storage unit 10, storing any remaining energy after meeting the total power demand in the energy storage unit 10. Even if the remaining energy of the photovoltaic unit 70 is insufficient to fully charge the energy storage unit 10, since the energy storage unit 10 has a high state of charge, there is no need to control the grid 300 to charge the energy storage unit 10.

[0118] When the SOC of the energy storage battery is less than the second threshold, the energy storage unit 10 has a low power level. If the remaining power of the photovoltaic unit 70 is insufficient to charge the energy storage unit 10 to a suitable state, the power of the grid 300 is used to charge the energy storage unit 10, that is, the photovoltaic unit 70 and the grid 300 are controlled to charge the energy storage unit 10.

[0119] Thus, based on the state of charge of the energy storage battery and the second threshold, it can be determined whether it is necessary to draw power from the grid 300 together with the photovoltaic unit 70 to charge the energy storage unit 10.

[0120] Please see Figure 8 In some embodiments, the photovoltaic-storage-charging power system 100 further includes an energy storage unit 10. Step 01 (determining the power supply strategy for the photovoltaic unit 70 and the energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power system 100) includes:

[0121] 013: Based on the output power of the photovoltaic unit 70, the total power demand of the photovoltaic-storage-charging power system 100, and the operating status of the DC charging pile 30, determine the power supply strategy for the photovoltaic unit 70 and the energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50.

[0122] In some implementations, the processor can be used to determine a power supply strategy for supplying power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70, the total power demand of the photovoltaic-storage-charging power source system 100, and the operating status of the DC charging pile 30.

[0123] In some embodiments, the determining module includes a third determining submodule. The third determining submodule can be used to determine the power supply strategy for supplying power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70, the total power demand of the photovoltaic-storage-charging power source system 100, and the operating status of the DC charging pile 30.

[0124] Specifically, since the uninterruptible power supply 50 needs continuous power, the power supply strategy should always maintain power supply to the uninterruptible power supply 50. The DC charging pile 30, however, does not require power when not in operation; therefore, the power supply strategy for both the DC charging pile 30 and the uninterruptible power supply 50 can be determined based on the operating status of the DC charging pile 30.

[0125] When the DC charging pile 30 is not operating, its power demand is zero, and no power supply is required. At this time, considering the power demand of the uninterruptible power supply 50 and the output power of the photovoltaic unit 70, the power supply strategy for the uninterruptible power supply 50 can be determined.

[0126] When the DC charging pile 30 is in operation, its power demand is not zero, and it needs to be powered. At this time, the power supply strategy for the uninterruptible power supply 50 and the DC charging pile 30 is determined based on the sum of their power demands and the output power of the photovoltaic unit 70.

[0127] Therefore, by incorporating the operating status of the DC charging pile 30 into the parameters for determining the power supply strategy, the power supply strategy can be determined more accurately.

[0128] Please see Figure 9 In some embodiments, when the DC charging pile 30 is in operation, step 013 (determining the power supply strategy for the photovoltaic unit 70 and energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70, the total power demand of the photovoltaic-storage-charging power source system 100, and the operating status of the DC charging pile 30) includes:

[0129] 0131: If the DC charging pile 30 is not in operation, determine that the DC charging pile 30 will not be supplied with power;

[0130] 0132: Based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power supply system 100, determine the power supply unit for supplying power to the uninterruptible power supply 50. The power supply unit includes the photovoltaic unit 70, the energy storage unit 10, and the power grid 300 connected to the photovoltaic unit 70, the energy storage unit 10, and the photovoltaic-storage-charging power supply system 100.

[0131] In some embodiments, the processor can be used to determine that no power should be supplied to the DC charging pile 30 when the DC charging pile 30 is not in operation; and to determine a power supply unit for supplying power to the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power system 100, the power supply unit including the photovoltaic unit 70, the energy storage unit 10 and the power grid 300 to which the photovoltaic unit 70, the energy storage unit 10 and the photovoltaic-storage-charging power system 100 are connected.

[0132] In some embodiments, the third determining submodule includes a first determining unit and a second determining unit. The first determining unit can be used to determine that no power will be supplied to the DC charging pile 30 when it is not in operation. The second determining unit can be used to determine, based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging-power-system 100, a power supply unit that supplies power to the uninterruptible power supply 50, including the photovoltaic unit 70, the energy storage unit 10, and the power grid 300 to which the photovoltaic-storage-charging-power-system 100 is connected.

[0133] Specifically, when the DC charging pile 30 is not in operation, the power demand of the DC charging pile 30 is 0, i.e., P3 = 0. At this time, the DC charging pile 30 does not need to be considered. Based on the output power P0 of the photovoltaic unit 70 and the power demand P2 of the uninterruptible power supply 50, the power supply unit that supplies power to the uninterruptible power supply 50 can be determined.

[0134] When P0≥P2, the photovoltaic unit 70 is controlled to supply power to the uninterruptible power supply 50, that is, the power supply unit is the photovoltaic unit 70.

[0135] When P0 < P2 and P0 + P1 ≥ P2, the photovoltaic unit 70 and the energy storage unit 10 are controlled to supply power to the uninterruptible power supply 50, that is, the power supply units are the photovoltaic unit 70 and the energy storage unit 10.

[0136] When P0+P1<P2, the photovoltaic unit 70, energy storage unit 10 and grid 300 are controlled to supply power to the uninterruptible power supply 50, that is, the power supply unit is the photovoltaic unit 70, energy storage unit 10 and grid 300.

[0137] Thus, when the DC charging pile 30 is not in operation, the power supply unit that supplies power to the uninterruptible power supply 50 can be determined based on the output power of the photovoltaic unit 70 and the power demand of the uninterruptible power supply 50.

[0138] Please see Figure 10In some embodiments, when the DC charging pile 30 is in operation, step 013 (determining the power supply strategy for the photovoltaic unit 70 and energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70, the total power demand of the photovoltaic-storage-charging power source system 100, and the operating status of the DC charging pile 30) includes:

[0139] 0133: If the DC charging pile 30 is not in operation, determine that the DC charging pile 30 will not be supplied with power;

[0140] 0134: Based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power system 100, determine the power supply unit for supplying power to the uninterruptible power supply 50 and the DC charging pile 30. The power supply unit includes the photovoltaic unit 70, the energy storage unit 10 and the power grid 300 connected to the photovoltaic unit 70, the energy storage unit 10 and the photovoltaic-storage-charging power system 100.

[0141] In some embodiments, the processor can be used to determine that no power should be supplied to the DC charging pile 30 when the DC charging pile 30 is not in operation; it can also be used to determine the power supply unit for supplying power to the uninterruptible power supply 50 and the DC charging pile 30 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power system 100, the power supply unit including the photovoltaic unit 70, the energy storage unit 10 and the power grid 300 to which the photovoltaic-storage-charging power system 100 is connected.

[0142] In some embodiments, the third determining submodule includes a third determining unit and a fourth determining unit. The third determining unit can be used to determine that no power supply will be provided to the DC charging pile 30 when it is not in operation. The fourth determining unit can be used to determine, based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power system 100, a power supply unit that supplies power to the uninterruptible power supply 50 and the DC charging pile 30. The power supply unit includes the photovoltaic unit 70, the energy storage unit 10, and the power grid 300 to which the photovoltaic-storage-charging power system 100 is connected.

[0143] Specifically, when the DC charging pile 30 is not in operation, the power demand of the DC charging pile 30 is 0, that is, P3≠0. Therefore, based on the output power P0 of the photovoltaic unit 70 and the total power demand P=P2+P3, the power supply units for the uninterruptible power supply 50 and the DC charging pile 30 can be determined.

[0144] When P0≥P2+P3, the photovoltaic unit 70 is controlled to supply power to the uninterruptible power supply 50 and the DC charging pile 30, that is, the power supply unit is the photovoltaic unit 70.

[0145] When P0 < P2 + P3 and P0 + P1 ≥ P2 + P3, the photovoltaic unit 70 and the energy storage unit 10 are controlled to supply power to the uninterruptible power supply 50 and the DC charging pile 30, that is, the power supply unit is the photovoltaic unit 70 and the energy storage unit 10.

[0146] When P0+P1<P2+P3, the photovoltaic unit 70, energy storage unit 10 and grid 300 are controlled to supply power to the uninterruptible power supply 50 and DC charging pile 30, that is, the power supply unit is the photovoltaic unit 70, energy storage unit 10 and grid 300.

[0147] Thus, when the DC charging pile 30 is in operation, the power supply units for the uninterruptible power supply 50 and the DC charging pile 30 can be determined based on the output power of the photovoltaic unit 70 and the total power demand.

[0148] Please see Figure 11 This application provides a photovoltaic-storage-charging power supply system 100, which includes an energy storage unit 10, a DC charging pile 30, an uninterruptible power supply 50, a photovoltaic unit 70, and a controller 90. The photovoltaic unit 70 and the energy storage unit 10 are electrically connected to a DC-DC conversion unit 20, which is electrically connected to the DC charging pile 30 and a DC-AC conversion unit 40. The DC-AC conversion unit 40 is electrically connected to the uninterruptible power supply 50. The controller 90 is communicatively connected to the energy storage unit 10, the DC charging pile 30, the uninterruptible power supply 50, and the photovoltaic unit 70. The controller 90 is configured as follows:

[0149] Based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power supply system 100, the power supply strategy for the photovoltaic unit 70 and the energy storage unit 10 to supply power to the DC charging pile 30 and the uninterruptible power supply 50 is determined. The total power demand is the sum of the power demand of the DC charging pile 30 and the power demand of the uninterruptible power supply 50.

[0150] Specifically, the controller 90 can communicate with the energy storage communication subunit, the charging pile communication subunit, the DC-DC communication subunit, and the DC-AC communication subunit to obtain the status of the energy storage unit 10, the DC charging pile 30, the photovoltaic unit 70, and the uninterruptible power supply 50, and control them. Figure 3Dark-colored connecting lines are DC transmission lines, light-colored connecting lines are AC transmission lines, and double-arrow connecting lines are communication transmission lines. The photovoltaic-storage-charging power supply system 100 also includes a DC-DC conversion unit 20, a DC-AC conversion unit 40, and a medium-voltage unit. The DC-DC conversion unit 20 connects the photovoltaic unit 70, the energy storage unit 10, the DC-AC conversion unit 40, and the DC charging pile 30 to convert the DC voltage generated by the photovoltaic unit 70 to a suitable voltage for supplying the energy storage unit 10, the DC-AC conversion unit 40, and the DC charging pile 30. The DC-AC conversion unit 40 connects the DC-DC conversion unit 20, the uninterruptible power supply 50, and the medium-voltage unit to convert DC power to AC power. The medium-voltage unit processes the AC power and outputs it to the power grid 300. The above explanation of the control method for the photovoltaic-storage-charging power supply system 100 also applies to the photovoltaic-storage-charging power supply system 100 of this application embodiment, and will not be repeated here.

[0151] Thus, by determining the power source for the DC charging pile 30 and / or the uninterruptible power supply 50 based on the output power of the photovoltaic unit 70 and the total power demand of the photovoltaic-storage-charging power supply system 100, the power supply to the DC charging pile 30 and the uninterruptible power supply 50 by the photovoltaic unit 70 and the energy storage unit 10 can be jointly controlled.

[0152] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method as described in any of the above embodiments.

[0153] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or some intermediate form. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc.

[0154] In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples.

[0155] Furthermore, the term "connection" should be interpreted broadly. For example, it can include fixed connections, detachable connections, or integral connections; it can include direct connections or indirect connections through an intermediate medium; and it can also include internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0156] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0157] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0158] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A control method for a photovoltaic-storage-charging power supply system, characterized in that, The photovoltaic-storage-charging power system includes a photovoltaic unit, an energy storage unit, a DC charging pile, and an uninterruptible power supply (UPS). The photovoltaic unit and the energy storage unit are electrically connected to a DC-DC conversion unit, which is electrically connected to both the DC charging pile and a DC-AC conversion unit. The DC-AC conversion unit is also electrically connected to the UPS. The control method includes: Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power supply system, a power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply is determined, wherein the total power demand is the sum of the power demand of the DC charging pile and the power demand of the uninterruptible power supply.

2. The control method according to claim 1, characterized in that, The step of determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-energy storage-charging power source system includes: If the output power of the photovoltaic unit is greater than or equal to the total power demand, the power supply strategy is determined to be to control the photovoltaic unit to supply power. If the output power of the photovoltaic unit is less than the total power demand, the power supply strategy is determined to include controlling the photovoltaic unit and the energy storage unit to supply power.

3. The control method according to claim 2, characterized in that, When the output power of the photovoltaic unit is less than the total power demand, determining the power supply strategy includes controlling the photovoltaic unit and the energy storage unit to supply power, including: If the sum of the output power of the photovoltaic unit and the output power of the energy storage unit is greater than or equal to the total power demand, the power supply strategy is determined to be: control the photovoltaic unit and the energy storage unit to supply power; If the sum of the output power of the photovoltaic unit and the output power of the energy storage unit is less than the total power demand, the power supply strategy is determined to be: control the power grid connected to the photovoltaic unit, the energy storage unit and the photovoltaic-energy storage-charging power system to supply power.

4. The control method according to claim 2, characterized in that, When the output power of the photovoltaic unit is greater than or equal to the total power demand, the control method further includes: If the output power of the photovoltaic unit is greater than the sum of the input power of the energy storage unit and the total demand power, the photovoltaic unit is controlled to supply power to the energy storage unit and to the power grid connected to the photovoltaic-energy storage-charging power system.

5. The control method according to claim 2, characterized in that, When the output power of the photovoltaic unit is greater than or equal to the total power demand, the control method further includes: If the output power of the photovoltaic unit is less than or equal to the sum of the input power of the energy storage unit and the total demand power, the photovoltaic unit is controlled to supply power to the energy storage unit.

6. The control method according to claim 4 or 5, characterized in that, When the output power of the photovoltaic unit is greater than the total power demand, controlling the photovoltaic unit to supply power to the energy storage unit includes: If the state of charge of the energy storage unit is less than a first threshold, the photovoltaic unit is controlled to charge the energy storage unit.

7. The control method according to claim 6, characterized in that, The control of the photovoltaic unit to supply power to the energy storage unit includes: If the state of charge of the energy storage unit is less than the second threshold, the power grid connected to the photovoltaic unit and the photovoltaic-storage-charging power source system is controlled to charge the energy storage unit, where the first threshold is greater than the second threshold.

8. The control method according to claim 1, characterized in that, The step of determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-energy storage-charging power source system includes: Based on the output power of the photovoltaic unit, the total power demand of the photovoltaic-storage-charging power supply system, and the operating status of the DC charging pile, the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply is determined.

9. The control method according to claim 8, characterized in that, When the DC charging pile is in operation, determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit, the total power demand of the photovoltaic-energy storage-charging power source system, and the operating status of the DC charging pile includes: If the DC charging pile is not in operation, it is determined that no power will be supplied to the DC charging pile; Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power source system, a power supply unit for supplying power to the uninterruptible power supply is determined. The power supply unit includes the photovoltaic unit, the energy storage unit, and the power grid connected to the photovoltaic-storage-charging power source system.

10. The control method according to claim 8, characterized in that, When the DC charging pile is in operation, determining the power supply strategy for the photovoltaic unit and the energy storage unit to supply power to the DC charging pile and the uninterruptible power supply based on the output power of the photovoltaic unit, the total power demand of the photovoltaic-energy storage-charging power source system, and the operating status of the DC charging pile includes: If the DC charging pile is not in operation, it is determined that no power will be supplied to the DC charging pile; Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power source system, a power supply unit is determined to supply power to the uninterruptible power supply and the DC charging pile. The power supply unit includes the power grid to which the photovoltaic unit, the energy storage unit, and the photovoltaic-storage-charging power source system are connected.

11. A photovoltaic-storage-charging power supply system, characterized in that, The photovoltaic-storage-charging power system includes a photovoltaic unit, an energy storage unit, a DC charging pile, an uninterruptible power supply (UPS), and a controller. The photovoltaic unit and the energy storage unit are each electrically connected to a DC-DC conversion unit. The DC-DC conversion unit is electrically connected to both the DC charging pile and a DC-AC conversion unit. The DC-AC conversion unit is electrically connected to the UPS. The controller is configured as follows: Based on the output power of the photovoltaic unit and the total power demand of the photovoltaic-storage-charging power supply system, a power supply strategy for the photovoltaic unit and energy storage unit to supply power to the DC charging pile and the uninterruptible power supply is determined, wherein the total power demand is the sum of the power demand of the DC charging pile and the power demand of the uninterruptible power supply.

12. A computer device, characterized in that, The computer device includes one or more processors and a memory, the memory storing a computer program that, when executed by the processor, implements the steps of the control method as described in any one of claims 1 to 10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by a processor, it implements the steps of the control method as described in any one of claims 1 to 10.

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