Power supply method for photovoltaic energy storage and charging system, photovoltaic energy storage and charging system, and storage medium

Abstract

Disclosed in the present application is a power supply method for a photovoltaic energy storage and charging system. The method comprises: on the basis of a preset power prediction model, determining a predicted photovoltaic power generation power of a photovoltaic power generation device and a predicted load power of a load circuit; on the basis of the predicted photovoltaic power generation power and the predicted load power, determining a target working mode and a working power of the photovoltaic energy storage device; on the basis of the target working mode and the working power of the photovoltaic energy storage device, determining a target power; and on the basis of the target power, controlling the photovoltaic power generation device to provide a power source for the load circuit. By means of predicting a predicted photovoltaic power generation power and a predicted load power within a future time period, the overall energy input and output condition of a system is determined, and therefore a target working mode of a photovoltaic energy storage device is determined, such that the charging energy supply is sufficient, the energy utilization efficiency is improved, and the dependence on a utility power grid is reduced; and by using an energy storage system, energy is acquired from the utility power grid when the sunlight is weak or at night to meet the energy requirement of a charging device, thereby reducing the dependence on the utility power grid.

Description

Power supply method for optical storage and charging system, optical storage and charging system, and storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 18, 2023, with application number 202311751762.0 and application name “Power supply method for photoelectric storage and charging system, photoelectric storage and charging system and storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of charging, and in particular to a power supply method, a light-storage-charging system, and a storage medium. Background Art

[0003] With the continuous development of new energy technologies, a photovoltaic storage and charging system has emerged that integrates photovoltaic power generation equipment, photovoltaic energy storage equipment, and charging stations. The electricity generated by the photovoltaic power generation equipment can be used to power the load or stored in the photovoltaic energy storage equipment to cope with insufficient photovoltaic power, thereby reducing the charging station's dependence on the power supply of the power grid system.

[0004] However, due to the instability of photovoltaic power generation and the changes in load power, the photovoltaic storage and charging system is highly dependent on energy obtained from the mains power grid system. Summary of the Invention

[0005] The present application provides a power supply method, a photovoltaic storage and charging system, and a storage medium to solve the problem in the prior art that the photovoltaic storage and charging system is difficult to adjust the energy obtained from the mains power grid system in a timely manner, resulting in the charging pile being unable to obtain sufficient power supply.

[0006] In a first aspect, the present application provides a power supply method for a photovoltaic storage and charging system, wherein the photovoltaic storage and charging system includes a photovoltaic power generation device and a photovoltaic energy storage device. The photovoltaic power generation device, the photovoltaic energy storage device, and an external power grid system can all provide power for a preset load circuit, and the load circuit is provided with a charging pile. The method includes:

[0007] Determining the predicted photovoltaic power generation power of the photovoltaic power generation equipment and the predicted load power of the load circuit according to a preset power prediction model;

[0008] Determining a target operating mode of the photovoltaic energy storage device and an operating power under the target operating mode according to the predicted photovoltaic power generation power and the predicted load power;

[0009] Determining a target power according to the target operating mode and the operating power of the photovoltaic energy storage device;

[0010] The photovoltaic power generation equipment is controlled according to the target power to provide power to the load circuit.

[0011] Optionally, determining the target operating mode of the photovoltaic energy storage device according to the predicted photovoltaic power generation power and the predicted load power includes:

[0012] Calculating a first difference based on the predicted photovoltaic power generation and the predicted load power;

[0013] Determining whether the first difference is greater than a preset value;

[0014] If it is greater than or equal to, determining that the target operating mode of the photovoltaic energy storage device is the energy storage mode;

[0015] If it is less than, it is determined that the target operating mode of the photovoltaic energy storage device is the power supply mode.

[0016] Optionally, when the target operating mode is the energy storage mode, the operating power is the charging power, and determining the operating power of the photovoltaic energy storage device includes:

[0017] determining a maximum total power of the load circuit;

[0018] determining whether the first difference is greater than the maximum total power;

[0019] If it is greater than, determining the charging power according to the first difference and the maximum total power;

[0020] If it is less than, the charging power is determined according to the preset minimum charging power.

[0021] Optionally, after determining the charging power, determining the target power according to the target operating mode and the operating power of the photovoltaic energy storage device includes:

[0022] Determine the current photovoltaic power generation power;

[0023] The target power is determined according to the current photovoltaic power generation power and the charging power.

[0024] Optionally, when the target operating mode is a power supply mode, the operating power is a discharge power, and determining the operating power of the photovoltaic energy storage device includes:

[0025] determining a minimum total power of the load circuit;

[0026] Determining whether the first difference is less than the minimum total power;

[0027] If it is greater than or equal to, determining the discharge power according to the first difference and the minimum total power;

[0028] If it is less than, the discharge power is determined according to the preset minimum discharge power.

[0029] Optionally, after determining the charging power, determining the target power according to the target operating mode and the operating power of the photovoltaic energy storage device includes:

[0030] Determine the current photovoltaic power generation power;

[0031] The target power is determined according to the current photovoltaic power generation power and the discharge power.

[0032] Optionally, before determining the target power, the method further includes:

[0033] Determine the current load power;

[0034] Determining whether the sum of the current photovoltaic power generation power and the discharge power is less than the current load power;

[0035] If it is less than, determining the grid power supply power according to the current photovoltaic power generation power, the discharge power and the current load power; then, determining the target power according to the current photovoltaic power generation power and the discharge power includes:

[0036] The target power is determined according to the current photovoltaic power generation power, the discharge power and the grid power supply power.

[0037] Optionally, determining the predicted photovoltaic power generation power of the photovoltaic power generation equipment according to a preset power prediction model includes:

[0038] Determine current light intensity and weather forecast;

[0039] Obtaining predicted light intensity according to a preset light intensity prediction model, the current light intensity, and the weather forecast;

[0040] The photovoltaic predicted power is determined according to the predicted light intensity.

[0041] Optionally, the target operating mode further includes:

[0042] Self-sufficient mode, the solar-storage-charging system is configured to meet the power demand of the charging pile through the power generated by the photovoltaic power generation equipment in the self-sufficient mode;

[0043] Hybrid mode, the solar-storage-charging system is configured to obtain electricity from photovoltaic power generation equipment and the power grid system to meet the power demand of the charging pile in the hybrid mode;

[0044] Energy priority mode, the solar storage and charging system is configured to preferentially obtain electrical energy from photovoltaic power generation equipment in the energy priority mode to meet the electrical energy demand of the charging pile;

[0045] Energy storage priority mode: the photovoltaic energy storage system is configured to preferentially store excess electrical energy generated by the photovoltaic power generation equipment in the photovoltaic energy storage equipment under the energy storage priority mode.

[0046] In a second aspect, the present application further provides a solar storage and charging system, comprising:

[0047] Photovoltaic power generation equipment, which is used to receive light energy and convert it into electrical energy for output;

[0048] Photovoltaic energy storage equipment, the photovoltaic energy storage equipment is used to store the electrical energy output by the photovoltaic power generation equipment or output the stored electrical energy;

[0049] A control device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first aspect when executing the computer program.

[0050] In a third aspect, the present application further provides a storage medium storing a computer program, which implements the method described in the first aspect when executed by a processor.

[0051] The embodiments of the present application predict the predicted photovoltaic power generation power and predicted load power in a future time period to determine the overall energy input and output of the system in that time period, thereby comprehensively determining how the photovoltaic energy storage device should select a target operating mode and maintain that target operating mode within that time period. When the photovoltaic power generation power or load power fluctuates within a very short period of time due to its own instability, uncertainty, or other external conditions such as weather changes, it will not affect the photovoltaic energy storage device's selection of the target operating mode, thereby preventing the photovoltaic energy storage device from rapidly changing its charging mode or discharging mode in the short term and maintaining operation within a relatively stable target operating mode, thereby increasing the expected service life of the photovoltaic energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0053] FIG1 is a schematic diagram of an application scenario of a power supply method for a solar-storage-charging system provided in one embodiment of the present application;

[0054] FIG2 is a schematic flow chart of a power supply method for a solar-storage-charging system provided in an embodiment of the present application;

[0055] FIG3 is a schematic flow chart of a method for determining photovoltaic predicted power in one embodiment of the present application;

[0056] FIG4 is a flow chart of a method for determining a target operating mode in one embodiment of the present application;

[0057] FIG5 is a schematic diagram of the architecture of a computer device in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] First, the application environment of the method provided in the embodiment of the present application is introduced.

[0060] Please refer to Figure 1, which is a schematic diagram of an application scenario of a power supply method for a photovoltaic storage and charging system provided in an embodiment of the present application. The method provided in an embodiment of the present application can be applied in a charging system as shown in Figure 1, which includes a photovoltaic power generation device 100, a photovoltaic energy storage device 200, a charging pile 310 and a control device 400, wherein the charging pile 310 is a load in a preset load circuit 300, and the charging pile 310 is also connected to an external power grid system 500 to obtain power from the power grid system 500. The charging pile 310 can be electrically connected to the device to be charged 600 to charge the device to be charged 600.

[0061] The photovoltaic power generation device 100 is used to receive sunlight and convert light energy into electrical energy to provide power to the charging station 310. For example, the photovoltaic power generation device 100 includes a photovoltaic module formed of monocrystalline silicon or polycrystalline silicon. The photovoltaic module mainly receives sunlight during the day and uses the photoelectric effect to convert solar energy into direct current. The generated direct current is converted into alternating current through an inverter component to be incorporated into the power grid system 500 or directly used by the charging station 310. It should be noted that the specific structure and specific operating principle of the photovoltaic power generation device 100 are not the focus of this application and are not limited here. As long as it can achieve the conversion of light energy into electrical energy, it is sufficient.

[0062] Photovoltaic energy storage device 200 is used to store the electrical energy generated by photovoltaic power generation device 100 and release the stored electrical energy according to instructions. In some embodiments, photovoltaic energy storage device 200 is a battery pack. Photovoltaic energy storage device 200 is connected to photovoltaic power generation device 100 and charging station 310 to store the electrical energy generated by photovoltaic power generation device 100. When the photovoltaic power generated by photovoltaic power generation device 100 cannot meet the load power, photovoltaic energy storage device 200 provides its stored electrical energy to charging station 310. This allows photovoltaic energy storage device 200 to buffer electrical energy and reduce the impact of power supply peaks and troughs on stability.

[0063] The charging pile 310 is used to obtain power from the photovoltaic power generation equipment 100 or the power grid system 500, and provide charging power to the connected device to be charged 600 to complete the charging task of the device to be charged 600. The number of charging piles 310 can be single or multiple. Multiple charging piles 310 can form a hierarchical relationship of charging piles-charging groups-charging stations according to the control logic. Each charging pile 310 is equipped with at least one charging gun (not shown in the figure). The charging pile 310 is connected to the device to be charged 600, such as a new energy electric vehicle, through the charging gun to perform the charging task. The charging gun can provide charging outputs of different powers to achieve power adjustment of the charging pile 310 to the device to be charged 600.

[0064] In some embodiments, the load circuit 300 includes other loads in addition to the charging station 310. For example, the load circuit also includes a home grid 320. That is, the solar-storage-charging system is coupled to the home grid 320 to power loads in the home grid 320, such as washing machines, lights, water heaters, and floor heating.

[0065] Grid system 500 is an external system independent of the charging system. Grid system 500 is coupled to charging station 310 to provide power to charging station 310. For example, grid system 500 can be a utility grid, supplying power to loads throughout a city; or grid system 500 can be a dedicated grid, supplying power to specific businesses or industrial parks.

[0066] The control device 400 is in communication with the charging station 310 to manage the power output from the charging station 310 to the device to be charged 600 and the power supply obtained from the photovoltaic power generation device 100 and / or the power grid system 500. In some embodiments, the control device 400 is an EMS (Energy Management System), which can be composed of one or more workstations or servers. It monitors the charging station 310, the photovoltaic power generation device 100, and the power grid system 500, collects and queries data, and adjusts the power supply relationship between the charging station 310, the photovoltaic power generation device 100, and the power grid system 500 based on the data. In addition, the control device 400 can also monitor and query the data status of the photovoltaic energy storage device 200 and control the charging and discharging of the photovoltaic energy storage device 200. The data that the control device 400 can obtain includes charging power information of the charging station 310, information of the device to be charged 600, photovoltaic power supply information of the photovoltaic power generation device 100, power supply information of the power grid system 500, and interactive information sent by users.

[0067] It is understood that the composition of the solar-powered storage and charging system shown in Figure 1 is merely an example. In actual practice, devices or modules may be integrated, adjusted, or added as needed. For example, the solar-powered storage and charging system may include a power detection device, such as a smart meter, to calculate the power supply and the total amount of power supplied, thereby calibrating the charging power of the charging station 310, the power supply of the photovoltaic power generation equipment 100 or the power grid system 500, and calculating the power supply costs. This application does not impose any restrictions on this.

[0068] Please refer to FIG2 , which is a schematic flow chart of a power supply method for a solar-storage-charging system provided in an embodiment of the present application. The power supply method shown in FIG2 may be executed by a control device, and the method may include:

[0069] S21. Determine the predicted photovoltaic power generation power of the photovoltaic power generation equipment and the predicted load power of the load circuit according to a preset power prediction model.

[0070] In this step, the power prediction model is defined as a mathematical model that obtains a series of output results based on a series of input values ​​and an explicit or implicit logical relationship, wherein the output result is the predicted power value. Specifically, the power prediction model can include multiple models, each used to predict different powers of different devices, such as a power generation prediction model for predicting photovoltaic power generation and a load power prediction model for predicting load power. Depending on the selection of input values, the logical relationship between input and output, the data sample size, the prediction accuracy requirements and other factors, different power prediction models have different modeling methods, such as regression statistical modeling, artificial neural network modeling, etc. The power generation prediction model will be introduced in detail later and will not be explained in detail here.

[0071] In this step, the predicted photovoltaic power generation power is the predicted value generated by the power prediction model. Since the light intensity is different at different times of the day, and cloudy weather, rain, etc. will affect the photovoltaic power generation power, the actual photovoltaic power generation power at different times is different. In some embodiments, the predicted photovoltaic power generation power can be the average value of the photovoltaic power generation power within a period of time to cover the situation where the photovoltaic power generation power at different times is different. For example, the power prediction model predicts the photovoltaic power generation power in the next 24 hours, of which the photovoltaic power generation power for 12 hours is 7kw, and the photovoltaic power generation power for the remaining 12 hours is 0kw, then the predicted average photovoltaic power generation power per hour is 3.5kw, which can be easily calculated as the total photovoltaic energy supply for the next 24 hours is 84kwh. In some other embodiments, the predicted photovoltaic power generation power may be the photovoltaic power generation power in a specific time period or time point. For example, the power prediction model predicts that the predicted photovoltaic power generation power at 7:00 is 1 kW, 10:00 is 5 kW, 13:00 is 7 kW, 15:00 is 6 kW, and 19:00 is 0 kW. Then the total photovoltaic power supply in a certain time period in the future is E 供能 =∫ t W 发电 (t)dt, where t is the forecast period, W 发电 (t) is the predicted photovoltaic power generation power for the corresponding time period, which can also be simplified to E 供能 =∑ t W 发电 (t) × Δt, where Δt is the time interval. This method can more accurately calculate and predict photovoltaic energy supply, thereby improving the efficiency of the overall energy supply method.

[0072] In this step, the predicted load power is also the predicted value generated by the power prediction model. Specifically, the predicted load power includes not only the power of the charging pile, but also the power of other loads in the load circuit. For example, the load circuit includes a home power grid, which includes electrical appliances such as air conditioners, electric lights, air conditioners, washing machines, etc., and the usage frequencies of these electrical appliances are different, and the load power is also different, so the load power is not a fixed value. However, from a statistical point of view, the change of load power has a certain periodicity. For example, during the high temperature period in summer, the daily usage time and power of the air conditioner are relatively stable; for example, for a washing machine, it needs to be used once every certain period of time, so its power usage also has a certain periodic regularity. Therefore, according to the load usage pattern, multiple load power prediction models can be set to target different situations, such as summer, autumn, and winter, or divided into weekends and weekdays, and divided into daytime or nighttime. By using multiple power prediction models, the accuracy of the predicted load power can be improved.

[0073] S22. Determine a target operating mode of the photovoltaic energy storage device and an operating power under the target operating mode based on the predicted photovoltaic power generation power and the predicted load power.

[0074] In this step, the target operating mode specifically includes an energy storage mode and a power supply mode. In some embodiments, the photovoltaic energy storage device is a battery pack composed of multiple energy storage cells. For safety reasons, the photovoltaic energy storage device cannot simultaneously charge from the photovoltaic power generation device and supply power to the load circuit to avoid battery damage. In other words, the photovoltaic energy storage device can only select one of the energy storage mode and the power supply mode as the target operating mode. In other embodiments, the operating mode also includes a fast charging mode.

[0075] In this step, the operating power in the target operating mode corresponds to the energy storage mode and the power supply mode, namely the charging power and the discharging power, respectively. The charging power is the power of the photovoltaic power generation device to store electrical energy in the photovoltaic energy storage device, and the discharging power is the power of the photovoltaic energy storage device to provide electrical energy to the load circuit. For example, when the photovoltaic power generation power of the photovoltaic power generation device is 8kW, 5kW of which is used to directly supply power to the load circuit, and the remaining 3kW is used to store in the photovoltaic energy storage device to avoid power loss and waste. This 3kW is the charging power. Similarly, when the power required by the load circuit is 6kW and the photovoltaic power generation power provided by the photovoltaic power generation device is 5kW, 1kW is required from the photovoltaic energy storage device to meet the load power demand. This 1kW is the discharging power. It should be noted that both the charging power and the discharging power are set with upper limits. For example, if the charging power upper limit is 5kW and the difference between the photovoltaic power generation power and the load power is 7kW, the storage is still based on the charging power upper limit of 5kW.

[0076] In this step, the method for determining the target working mode depends on the comparison result of the predicted photovoltaic power generation power and the predicted load power. When the predicted photovoltaic power generation power is greater than the predicted load power, it can be judged that the photovoltaic power generation power (or total photovoltaic energy supply) is greater than the load power (or total load energy consumption) in the future target time period. For the entire photovoltaic storage and charging system, the input energy is greater than the output energy. In order to avoid input energy loss and waste, part of the input energy needs to be stored. Therefore, the target working mode is determined to be the energy storage mode. On the contrary, when the predicted photovoltaic power generation power is less than the predicted load power, it can be judged that the photovoltaic power generation power (or total photovoltaic energy supply) is greater than the load power (or total load energy consumption) in the future target time period. For the entire photovoltaic storage and charging system, the input energy is less than the output energy. In order to meet the load power requirements, the target working mode is determined to be the energy supply mode. The method for determining the working power also depends in part on the predicted photovoltaic power generation power and the predicted load power. It is relatively complicated compared to the method for determining the working mode. Therefore, it will be described in detail later and will not be explained here.

[0077] S23. Determine the target power according to the target operating mode and the operating power of the photovoltaic energy storage device.

[0078] In this step, the target power is the power supplied by each power source of the load circuit. For example, when the target operating mode is energy storage mode, the load's power supply source is only the photovoltaic power generation equipment. The target power is determined by the photovoltaic power generation power of the photovoltaic power generation equipment and the charging power of the photovoltaic energy storage equipment. For example, if the photovoltaic power generation power is 8kW and the charging power is 3kW, the power supply power of the photovoltaic power generation equipment is 5kW. When the target operating mode is energy supply mode, the load's power supply sources are the photovoltaic power generation equipment and the photovoltaic energy storage equipment. The target power is determined by the photovoltaic power generation power of the photovoltaic power generation equipment and the discharge power of the photovoltaic energy storage equipment. For example, if the photovoltaic power generation power is 3kW and the discharge power is 3kW, the power supply power of the photovoltaic power generation equipment is 3kW, the power supply power of the photovoltaic energy storage equipment is 3kW, and the target power is 6kW.

[0079] S24. Control the photovoltaic power generation equipment to provide power to the load circuit according to the target power.

[0080] In this step, the control device controls each power source to provide power to the load circuit based on the target power. For example, if the only power source is a photovoltaic power generation device, the photovoltaic power generation device is controlled to provide power to the load circuit. If both the photovoltaic power generation device and the photovoltaic energy storage device are used as power sources, the photovoltaic power generation device and the photovoltaic energy storage device are controlled to provide power to the load circuit based on their respective assigned target power. In some embodiments, if the power source also includes an external power grid system, the control device may also control the power grid system to provide power to the load circuit.

[0081] In an embodiment of the present application, by predicting the predicted photovoltaic power generation power and the predicted load power in a future time period, the overall energy input and output of the system in the time period is judged, thereby judging how the photovoltaic energy storage device selects the target working mode as a whole and maintains the target working mode in the time period. When the photovoltaic power generation power or load power fluctuates in a very short period of time due to its own instability, uncertainty or other external conditions such as weather changes, it will not affect the photovoltaic energy storage device's selection of the target working mode, so that the photovoltaic energy storage device will not quickly change the charging mode or discharge mode in the short term, and will maintain operation in a relatively stable target working mode, thereby increasing the expected service life of the photovoltaic energy storage device. At the same time, the present application also takes into account the energy storage full or discharge support time, and comprehensively considers the energy storage storage energy specifications to calculate the charging and discharging modes to avoid energy storage loss scenarios.

[0082] Please refer to Figure 3, which is a flow chart of a method for determining photovoltaic predicted power in an embodiment of the present application. In some embodiments, the method for determining photovoltaic predicted power specifically includes:

[0083] S31. Determine current light intensity and weather forecast.

[0084] S32. Obtain predicted light intensity based on a preset light intensity prediction model, current light intensity, and weather forecast.

[0085] S33. Determine the predicted photovoltaic power according to the predicted light intensity.

[0086] In step S31, the current light intensity is the light intensity detected by the photovoltaic power generation equipment. Specifically, the current light intensity is detected by a light sensor, which converts the light received by the sensor into a voltage signal through the photoelectric effect to represent the light intensity. The weather forecast can be a short-term report issued by a local meteorological office or a long-term report provided by a weather service provider. Factors such as local temperature, humidity, wind speed, and rainfall probability included in the weather forecast can be used as parameters to predict future light intensity together with the light intensity.

[0087] In step S32, the light intensity prediction model is pre-generated or directly retrieved from an open-source database. In some embodiments, the light intensity prediction model is obtained by performing feature mining on a data sample set, normalizing the mined data, and then constructing a model using a support vector machine (SVM) or decision tree algorithm. The model is then trained and validated using the data samples. The specific process is not described here. Based on this light intensity prediction model, the corresponding current light intensity and weather forecast are input to obtain the corresponding predicted light intensity.

[0088] In step S33, the photovoltaic power forecast for the corresponding time period can be determined by combining the predicted light intensity and the energy conversion efficiency of the photovoltaic power generation equipment. For example, when the light intensity is 1000W / m 2 When the energy conversion efficiency is 20%, if the area of ​​the photovoltaic panel is 1.5m 2 , then the photovoltaic power generation power is 200W / m 2 x1.5m 2 =300W. It should be noted that the energy conversion efficiency under different light intensities is affected by factors such as temperature and is not constant, but within a certain range of light intensity, the energy conversion efficiency can be regarded as a fixed value. For example, when the light intensity is 800W / m 2 Up to 1000W / m 2 When the light intensity is 800W / m 2 Up to 1000W / m 2 The energy conversion efficiency is 18.3%.

[0089] Please refer to Figure 4, which is a flow chart of a method for determining a target operating mode in an embodiment of the present application. In some embodiments, the method for determining a target operating mode specifically includes:

[0090] S41. Calculate a first difference based on the predicted photovoltaic power generation power and the predicted load power.

[0091] S42: Determine whether the first difference is greater than a preset value.

[0092] S43: If it is greater than or equal to, determine that the target operating mode of the photovoltaic energy storage device is the energy storage mode.

[0093] S44: If it is less than, determine that the target operating mode of the photovoltaic energy storage device is the power supply mode.

[0094] In step S41, the first difference is the difference between the predicted photovoltaic power generation power and the predicted load power, that is, the first difference = predicted photovoltaic power generation power - predicted load power. The first difference can be positive or negative. When the first difference is positive, it means that the predicted photovoltaic power generation power is greater than the predicted load power, and the overall input energy of the photovoltaic storage and charging system is greater than the output energy; on the contrary, when the first difference is negative, it means that the predicted photovoltaic power generation power is less than the predicted load power, and the overall input energy of the photovoltaic storage and charging system is less than the output energy.

[0095] In step S42, the preset value is a threshold value for judging the overall energy input and output of the photovoltaic energy storage system. In some embodiments, in order to maintain the stability of the load power, the photovoltaic energy storage system will reserve some additional power for the load power. Therefore, only when the first difference is greater than the preset value can the target operating mode of the photovoltaic energy storage device be determined to be the energy storage mode. For example, when the preset value is 2kw, if the first difference is 1kw, then although the predicted photovoltaic power generation power is slightly greater than the predicted load power, the target operating mode of the photovoltaic energy storage device is still the power supply mode. At this time, although the photovoltaic energy storage device does not need to discharge to the load to provide electrical energy most of the time, it is in a state of preparation for discharge, so that when the load power of the load circuit suddenly increases, the photovoltaic energy storage device can supply power to the load circuit in time to meet the load power requirements.

[0096] Furthermore, in some embodiments, after step S43, when the target operating mode is determined to be the energy storage mode, determining the operating power of the photovoltaic energy storage device includes:

[0097] S431. Determine the maximum total power of the load circuit.

[0098] S432: Determine whether the first difference is greater than the maximum total power.

[0099] S433: If it is greater than or equal to, determine the charging power according to the first difference and the maximum total power.

[0100] S434: If it is less than, determine the charging power according to the preset minimum charging power.

[0101] In step S431, the maximum total power of the load circuit is the sum of the maximum powers of all loads connected to the load circuit. For example, when the load circuit is connected to a household power grid, the power of various household electrical appliances is also included in the maximum total power. Electrical appliances are divided into basic loads and adjustable loads based on their purpose and usage. Basic loads, such as lights, refrigerators, and network equipment, have a certain degree of rigidity and their power cannot be adjusted. Adjustable loads, such as air conditioners, water heaters, and computers, have adjustable power during use or during operation. These loads are calculated based on their maximum power usage, ensuring that various electrical appliances are normally usable.

[0102] In step S433, if the first difference is greater than the maximum total power, it means that even if the load power is calculated according to the maximum total power, the photovoltaic power generation power is still sufficient to cover the load power, and there is additional photovoltaic power generation power that needs to be stored in the photovoltaic energy storage device. The charging power of the photovoltaic energy storage device is calculated based on the second difference obtained by subtracting the maximum total power from the first difference. If the first difference is equal to the maximum total power, since the two are equal, the charging power can be determined based on the first difference or the maximum total power. For example, if the first difference is 12kw and the maximum total power is 8kw, the second difference (i.e., the charging power) is 12-8=4kw.

[0103] In step S434, if the first difference is less than the maximum total power, this indicates that although the overall photovoltaic power quotient is greater than the predicted load power, it may not be possible to support all loads operating at maximum power at a specific time point. In this case, the photovoltaic power is stored in the photovoltaic energy storage device at a preset minimum power. In some embodiments, the preset minimum power may be 0, meaning that the photovoltaic energy storage device is not charged at this time.

[0104] In some embodiments, after determining the charging power, determining the target power includes the following steps: first, determining the current photovoltaic power generation power, and then determining the target power based on the photovoltaic power generation power and the charging power. Specifically, the current photovoltaic power generation power can be calculated by detecting the voltage and current of the photovoltaic power generation equipment. Since a portion of the photovoltaic power generation power needs to be stored in the photovoltaic energy storage device, the target power actually provided by the photovoltaic power generation equipment to the load circuit is the difference between the current photovoltaic power generation power and the charging power. For example, if the current photovoltaic power generation power is 8kw and the charging power is 2kw, the target power actually provided by the photovoltaic power generation power to the control circuit is 8-2=6kw.

[0105] Furthermore, after step S44, when the target operating mode is determined to be the power supply mode, determining the operating power of the photovoltaic energy storage device includes:

[0106] S441. Determine the minimum total power of the load circuit.

[0107] S442: Determine whether the first difference is less than the minimum total power.

[0108] S443: If it is greater than or equal to, determine the discharge power according to the first difference and the minimum total power.

[0109] S444: If it is less than, determine the discharge power according to the preset minimum discharge power.

[0110] In step S441, the minimum total power of the load circuit is the sum of the minimum powers of all loads connected to the load circuit. As described above, when the load circuit is connected to the home power grid, the minimum total power of the load circuit is the sum of the powers of all basic loads, thereby ensuring that the basic loads in the load circuit are in a usable state.

[0111] In step S443, if the first difference is greater than the minimum total power, the discharge power is determined directly according to the first difference. For example, if the first difference is 4 kW and the minimum total power is 2 kW, the discharge power is 4-2 = 2 kW. Even if the photovoltaic power generation power fluctuates, the discharge power of the energy storage battery is sufficient to cover the minimum total power of the load circuit. At this time, the basic load of the load circuit can still operate normally, and only the adjustable load is affected and reduces power. After the photovoltaic power generation power stops fluctuating and returns to stability, all loads in the load circuit can still operate normally. If the first difference is equal to the minimum total power, the discharge power can still be determined directly according to the first difference.

[0112] In step S444, if the first interpolation value is less than the minimum total power, the discharge power is determined according to the preset minimum discharge power. For example, if the first difference is 1 kW and the minimum total power is 2 kW, the discharge power is still calculated based on the minimum discharge power of 2 kW. Since the first difference is small, the gap between the photovoltaic power generation power and the load power is small. If it is still calculated based on the difference between the two, when the photovoltaic power generation power fluctuates and the load power is close to the minimum total power, the discharge power of the photovoltaic energy storage device is not enough to smooth out the fluctuation value, causing the load power to drop below the minimum total power, thereby affecting the normal operation of the load end. In order to avoid fluctuations in photovoltaic power generation power and reduce the loss of photovoltaic energy storage equipment, the photovoltaic energy storage equipment is operated at the minimum discharge power.

[0113] In some embodiments, after determining the discharge power, determining the target power includes the following steps: first, determining the current photovoltaic power generation power, and then determining the target power based on the photovoltaic power generation power and the discharge power. Specifically, the current photovoltaic power generation power can be calculated by detecting the voltage and current of the photovoltaic power generation equipment. The current photovoltaic power generation power and the discharge power together constitute the target power. That is, the photovoltaic power generation equipment is controlled to supply power to the load circuit according to the photovoltaic power generation power, and the photovoltaic energy storage device is controlled to supply power to the load circuit according to the discharge power. For example, if the photovoltaic power generation power is 6kW and the discharge power is 2kW, the target power is 8kW.

[0114] Furthermore, in some embodiments, after determining the photovoltaic power generation and discharge power, the method further includes: first determining the current load power, then determining whether the sum of the current photovoltaic power generation and discharge power is less than the current load power. Finally, if the determination result is less than, determining the grid power supply based on the current photovoltaic power generation, discharge power, and current load power, and determining the target power based on the current photovoltaic power generation, discharge power, and grid power supply. The photovoltaic energy storage device has its own upper limit for charging and discharging power. If the sum of the discharge power and photovoltaic power generation is less than the current load power, in order to meet the load power requirement of the load circuit, power must be obtained from the external power grid system to meet the load power requirement. Specifically, the grid power supply is calculated as the load power minus the photovoltaic power generation and discharge power. For example, if the load power is 12 kW, the photovoltaic power generation is 6 kW, and the discharge power is 2 kW, the grid power supply is 12 - 6 - 2 = 4 kW. Finally, the photovoltaic power generation device is controlled to supply 6 kW, the photovoltaic energy storage device to supply 2 kW, and the power grid to supply 4 kW to the load circuit.

[0115] In some embodiments, the target operating mode also includes a self-sufficient mode, and the photovoltaic energy storage system is configured to meet the power demand of the charging pile through the electricity generated by the photovoltaic power generation equipment in the self-sufficient mode. Specifically, when the target operating mode is the self-sufficient mode, if the light intensity is sufficient and the electricity generated by the photovoltaic power generation equipment is sufficient to supply the power demand of the charging pile, the electricity generated by the photovoltaic power generation equipment is directly supplied to the charging pile. If the light intensity is insufficient and the photovoltaic power generation equipment cannot supply sufficient electricity, the charging pile obtains electricity from the photovoltaic energy storage device to make up for the shortfall in electricity demand.

[0116] In some embodiments, the target operating mode also includes a hybrid mode, and the photovoltaic energy storage system is configured to obtain electricity from photovoltaic power generation equipment and the power grid system to meet the power demand of the charging pile in the hybrid mode. Specifically, when the target operating mode is a hybrid mode, the photovoltaic energy storage device can obtain electricity from the power grid system in addition to obtaining electricity from the photovoltaic power generation equipment, so that there is enough electricity stored in the photovoltaic energy storage device. If the light intensity is sufficient, the photovoltaic power generation equipment will still supply the charging pile, and the electricity that cannot be used in time will still be stored in the photovoltaic energy storage device; if the light intensity is insufficient, the charging pile will obtain electricity directly from the power grid system in addition to obtaining electricity from the photovoltaic power generation equipment, and the photovoltaic energy storage device will have the last priority.

[0117] In some embodiments, the target operating mode also includes an energy priority mode, and the solar-storage-charging system is configured to preferentially obtain electrical energy from the photovoltaic power generation equipment to meet the electrical energy demand of the charging pile in the energy priority mode. Specifically, when the target operating mode is the energy priority mode, if the light intensity is insufficient and the photovoltaic power generation equipment cannot meet the energy demand of the charging pile, the charging pile will obtain electrical energy from the photovoltaic energy storage equipment to make up for the shortfall in electrical energy demand. If the photovoltaic energy storage equipment still cannot meet the energy demand of the charging pile, the charging pile will continue to obtain electrical energy from the external power grid system to make up for the shortfall in electrical energy demand.

[0118] In some embodiments, the target operating mode also includes an energy storage priority mode, in which the photovoltaic energy storage system is configured to prioritize storing excess electricity generated by the photovoltaic power generation equipment in the photovoltaic energy storage device. Specifically, when the charging station needs to obtain electricity, the photovoltaic energy storage device obtains electricity from the photovoltaic power device; when the energy in the photovoltaic energy storage device is insufficient to meet the power demand of the charging station, the system obtains electricity from the external power grid system to fill the power demand gap.

[0119] It can be seen that the technical solution of the present application can achieve the following technical effects: by predicting the predicted photovoltaic power generation power and the predicted load power in a future time period, the overall energy input and output of the system in the time period can be judged, thereby judging how the photovoltaic energy storage device selects the target working mode as a whole and maintains the target working mode in the time period. When the photovoltaic power generation power or load power fluctuates in a very short period of time due to its own instability, uncertainty or other external conditions such as weather changes, it will not affect the photovoltaic energy storage device's selection of the target working mode, so that the photovoltaic energy storage device will not quickly change the charging mode or discharging mode in a short period of time, and will maintain operation in a relatively stable target working mode, thereby improving the expected service life of the photovoltaic energy storage device.

[0120] The present application also provides a solar storage and charging system, including:

[0121] Photovoltaic power generation equipment is used to receive light energy and convert it into electrical energy output.

[0122] Photovoltaic energy storage equipment is used to store the electric energy output by the photovoltaic power generation equipment or output the stored electric energy.

[0123] The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the power supply method for the solar-storage-charging system as described above is implemented.

[0124] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the method as described in the above embodiment.

[0125] An embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the power adjustment method based on the charging pile of the aforementioned embodiment is implemented.

[0126] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in Figure 5. The computer device includes a processor, a memory, a network interface, and a database connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data to be saved in a power adjustment method based on a charging pile. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a power adjustment method based on a charging pile is implemented.

[0127] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0128] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0129] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A power supply method for a photovoltaic storage and charging system, wherein the photovoltaic storage and charging system comprises a photovoltaic power generation device and a photovoltaic energy storage device, wherein the photovoltaic power generation device, the photovoltaic energy storage device and an external power grid system can provide power for a preset load circuit, wherein the load circuit is provided with a charging pile, characterized in that: The method comprises: Determining the predicted photovoltaic power generation power of the photovoltaic power generation equipment and the predicted load power of the load circuit according to a preset power prediction model; Determining a target operating mode of the photovoltaic energy storage device and an operating power under the target operating mode according to the predicted photovoltaic power generation power and the predicted load power; Determine the target power according to the target working mode and the working power of the photovoltaic energy storage device; The photovoltaic power generation device is controlled according to the target power to provide power to the load circuit.

2. The method according to claim 1, characterized in that Determining the target operating mode of the photovoltaic energy storage device according to the predicted photovoltaic power generation and the predicted load power includes: A first difference is calculated based on the predicted photovoltaic power generation and the predicted load power; Determining whether the first difference is greater than a preset value; In response to the first difference being greater than or equal to the preset value, determining that the target operating mode of the photovoltaic energy storage device is an energy storage mode; In response to the first difference being smaller than the preset value, it is determined that the target operating mode of the photovoltaic energy storage device is the power supply mode.

3. The method according to claim 2, characterized in that When the target working mode is the energy storage mode, the working power is the charging power, and determining the working power of the photovoltaic energy storage device according to the predicted photovoltaic power generation power and the predicted load power includes: determining a maximum total power of the load circuit; Determining whether the first difference is greater than the maximum total power; In response to the first difference being greater than or equal to the maximum total power, determining the charging power according to the first difference and the maximum total power; In response to the first difference being less than the maximum total power, the charging power is determined according to a preset minimum charging power.

4. The method according to claim 3, characterized in that Determining the target power according to the target working mode and the working power of the photovoltaic energy storage device includes: Determine the current photovoltaic power generation power; The target power is determined according to the current photovoltaic power generation power and the charging power.

5. The method according to claim 2, characterized in that: When the target working mode is the power supply mode, the working power is the discharge power, and determining the working power of the photovoltaic energy storage device includes: determining a minimum total power of the load circuit; Determining whether the first difference is less than the minimum total power; In response to the first difference being greater than or equal to the minimum total power, determining the discharge power according to the first difference and the minimum total power; In response to the first difference being smaller than the minimum total power, the discharge power is determined according to a preset minimum discharge power.

6. The method according to claim 5, characterized in that Determining the target power according to the target working mode and the working power of the photovoltaic energy storage device includes: Determine the current photovoltaic power generation power; The target power is determined according to the current photovoltaic power generation power and the discharge power.

7. The method according to claim 6, characterized in that Before determining the target power, the method further includes: Determine the current load power; Determining whether the sum of the current photovoltaic power generation power and the discharge power is less than the current load power; In response to being less than the current load power, determining the grid power supply power according to the current photovoltaic power generation power, the discharge power and the current load power; Then, determining the target power according to the current photovoltaic power generation power and the discharge power includes: The target power is determined according to the current photovoltaic power generation power, the discharge power and the grid power supply power.

8. The method according to any one of claims 1 to 7, characterized in that Determining the predicted photovoltaic power generation power of the photovoltaic power generation equipment according to the preset power prediction model includes: Determine current light intensity and weather forecast; Obtaining predicted light intensity according to a preset light intensity prediction model, the current light intensity and the weather forecast; The photovoltaic predicted power is determined according to the predicted light intensity.

9. The method according to any one of claims 1 to 7, characterized in that The target working mode also includes: Self-sufficient mode, the photovoltaic storage and charging system is configured to meet the power demand of the charging pile through the power generated by the photovoltaic power generation equipment in the self-sufficient mode; Hybrid mode, the photovoltaic storage and charging system is configured to obtain electric energy through photovoltaic power generation equipment and the power grid system to meet the electric energy demand of the charging pile in the hybrid mode; Energy priority mode, the photovoltaic storage and charging system is configured to preferentially obtain electrical energy from photovoltaic power generation equipment in the energy priority mode to meet the electrical energy demand of the charging pile; Energy storage priority mode, the photovoltaic energy storage system is configured to preferentially store excess electrical energy generated by the photovoltaic power generation equipment in the photovoltaic energy storage equipment under the energy storage priority mode.

10. A solar storage and charging system, characterized in that: include: Photovoltaic power generation equipment, the photovoltaic power generation equipment is used to receive light energy and convert the light energy into electrical energy for output; Photovoltaic energy storage equipment, the photovoltaic energy storage equipment is used to store the electric energy output by the photovoltaic power generation equipment or output the stored electric energy; A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 9 when executing the computer program.

11. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

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