Photovoltaic power generation, charging and storage integrated system applied to civil electricity and control method of photovoltaic power generation, charging and storage integrated system

Abstract

The embodiment of the invention provides a photovoltaic power generation, charging and storage integrated system applied to civil electricity and a control method thereof. The system comprises a photovoltaic power generation device, an energy storage device and an alternating current power distribution device. The system can calculate the photovoltaic power generation power according to the output parameters and the current environmental parameters after obtaining the output parameters, the current environmental parameters and the power consumption economy parameters of the photovoltaic power generation device. And detecting the load electric power of the internal network load, and generating a power distribution instruction according to the photovoltaic power generation power, the load electric power and the power consumption economical efficiency parameter, thereby setting the connection state of the interface unit according to the charging and storage coefficient and the taking and discharging coefficient in the power distribution instruction. The system can automatically determine the optimal adjustment strategy of photovoltaic power generation applied to civil power, and maximizes the power utilization economic benefit on the premise of meeting the power utilization demand by optimizing the proportioning coefficient in the power utilization process, thereby solving the problem that the charging and discharging switching cannot adapt to the power utilization demand of a power supply network.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a photovoltaic power generation, charging and storage integrated system and its control method for use in residential electricity. Background Technology

[0002] Photovoltaic power generation is a clean energy technology that uses solar panels to directly convert sunlight into electrical energy. These solar panels can be made of semiconductor materials such as silicon. When sunlight shines on the surface of a solar panel, photon energy excites electrons in the semiconductor material, causing them to transition from the valence band to the conduction band, thus creating electron-hole pairs. These electrons and holes are separated and collected under the influence of an electric field inside the panel, forming an electric current, thereby realizing the conversion of light energy into electrical energy.

[0003] The electricity generated by photovoltaic (PV) power generation can be connected to the power grid to power electrical equipment within the grid. However, solar energy is affected by time and weather conditions, resulting in a phased energy production cycle. During sunny days, when solar energy is abundant, PV power generation produces a significant amount of electricity. Conversely, at night or under cloudy or rainy conditions, when solar energy is insufficient, PV power generation produces little or no electricity. Therefore, to meet the power grid's demands, PV power generation equipment can be connected to energy storage devices to form a PV power generation and storage system.

[0004] Photovoltaic power generation charging and storage systems can adjust the charging and discharging control strategies of energy storage devices in real time according to sunlight conditions. When solar energy is abundant, the energy storage devices are controlled to enter a charging state to store the electricity generated by photovoltaic power generation; when solar energy is insufficient, the energy storage devices are controlled to enter a discharging state to meet the electricity demand at different times. However, this charging and discharging control strategy only performs charging and discharging switching according to a pre-set time period, which cannot adapt to the power demand of the power grid, increasing losses and reducing the economic efficiency of power supply. Summary of the Invention

[0005] In view of this, embodiments of this application provide a photovoltaic power generation charging and storage integrated system and its control method for use in residential electricity, in order to solve the problem that the charging and discharging switching cannot adapt to the power demand of the power supply network.

[0006] According to one aspect of this application, a photovoltaic power generation, charging, and energy storage integrated system for use in residential electricity is provided, the system comprising:

[0007] A photovoltaic power generation device, including a photovoltaic panel and an inverter connected to the photovoltaic panel;

[0008] An energy storage device, comprising an energy storage unit and an energy storage converter connected to the energy storage unit;

[0009] An AC power distribution device includes an interface unit and a controller connected to the interface unit; the interface unit connects to the inverter and the energy storage converter; the interface unit also connects to an internal network load and an external power supply network; the controller is configured to:

[0010] Obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device;

[0011] Calculate the photovoltaic power generation based on the output parameters and the current environmental parameters;

[0012] Detect the power consumption of the internal network load;

[0013] A power distribution command is generated based on the photovoltaic power generation capacity, the load power consumption, and the power consumption economic parameters. The power distribution command includes a charging-storage coefficient and a supply-extraction coefficient. The charging-storage coefficient is used to control the charging or discharging ratio of the energy storage device. The supply-extraction coefficient is used to control the power extraction or supply ratio from the external power supply network.

[0014] In response to the power distribution command, the connection state of the interface unit is set according to the charging and discharging coefficients and the charging and discharging coefficients.

[0015] In some embodiments, the controller, which performs the calculation of photovoltaic power generation based on the output parameters and the current environmental parameters, is further configured to:

[0016] The rated power of the photovoltaic panel and the inverter power generation efficiency of the inverter are extracted from the output parameters.

[0017] Set the power coefficient according to the current environmental parameters;

[0018] The product of the rated power, the inverter power generation efficiency, and the power coefficient is calculated to generate the photovoltaic power generation.

[0019] In some embodiments, the controller, which performs the setting of the power coefficient based on the current environmental parameters, is further configured to:

[0020] Read the working time from the current environmental parameters;

[0021] If the working time is during a non-sunlight period, the power coefficient is set to 0;

[0022] If the working time is during a period of daylight, the light intensity is obtained, and the power coefficient is calculated based on the light intensity, wherein the power coefficient is positively correlated with the light intensity.

[0023] In some embodiments, the system further includes a server that establishes a communication connection with the controller; the controller performs the task of acquiring light intensity and is further configured to:

[0024] Generate a weather information query instruction based on the working hours;

[0025] Send the weather information query command to the server and receive weather data from the server in response to the weather information query command;

[0026] Light intensity impact information is read from the weather data, and the light intensity impact information includes at least one of cloud information, atmospheric composition information, and geographic information;

[0027] The light intensity is calculated based on the light intensity influence information, and the light intensity is the weighted sum of the light intensity influence information.

[0028] In some embodiments, the controller, which generates power distribution instructions based on the photovoltaic power generation, the load power consumption, and the electricity consumption economic parameters, is further configured to:

[0029] Obtain the preset storage coefficient threshold;

[0030] If the photovoltaic power generation is greater than or equal to the load power, the charging-storage coefficient is set to a first charging-storage coefficient value, and the power distribution instruction is generated based on the first charging-storage coefficient value; the first charging-storage coefficient value is greater than the preset charging-storage coefficient threshold.

[0031] If the photovoltaic power generation is less than the load power, the charging and storage coefficient is set to a second charging and storage coefficient value, and the power distribution command is generated based on the second charging and storage coefficient value; the second charging and storage coefficient value is less than the preset charging and storage coefficient threshold.

[0032] In some embodiments, the controller is further configured to:

[0033] Calculate the power difference between the photovoltaic power generation and the load power consumption;

[0034] The charging power of the energy storage device is obtained, wherein the charging power includes charging power and discharging power;

[0035] When the power difference is greater than or equal to 0, the supply coefficient is set by comparing the charging power and the power difference;

[0036] When the power difference is less than 0, the supply coefficient is set by comparing the discharge power and the power difference.

[0037] In some embodiments, the controller, by comparing the charging power and the power difference to set the supply coefficient, is further configured to:

[0038] The energy storage device is set to a charging state.

[0039] Obtain the current charging power of the energy storage device under the charging state;

[0040] If the power difference is greater than or equal to the current charging power, the power supply ratio is set to a first power supply ratio value so that the photovoltaic power generation device supplies power to the external power supply network according to the first power supply ratio value.

[0041] If the power difference is less than the current charging power, the power extraction ratio is set to a first power extraction ratio value so that the energy storage device can extract power from the external power supply network according to the first power extraction ratio value.

[0042] In some embodiments, the controller, by comparing the discharge power and the power difference to set the supply coefficient, is further configured to:

[0043] The energy storage device is set to a discharge state, and the power supply ratio is set to a second power supply ratio value; the second power supply ratio value is used to control the photovoltaic power generation device to stop supplying power to the external power supply network.

[0044] The current discharge power and current remaining power of the energy storage device are obtained under the discharge state.

[0045] If the absolute value of the power difference is greater than or equal to the current discharge power, the power extraction ratio is set to a second power extraction ratio value so that the internal network load extracts power from the external power supply network according to the second power extraction ratio value;

[0046] If the absolute value of the power difference is less than the current discharge power, the power extraction ratio is set to a third power extraction ratio value based on the current remaining power, so that when the current remaining power is less than the power threshold, the energy storage device can extract power from the external power supply network according to the third power extraction ratio value.

[0047] In some embodiments, the controller, which generates power distribution instructions based on the photovoltaic power generation, the load power consumption, and the electricity consumption economic parameters, is further configured to:

[0048] Extract peak-valley intervals and associated electricity prices from the electricity consumption economic parameters;

[0049] The current peak-valley time period is determined based on the current working time and the aforementioned peak-valley interval;

[0050] If the current peak-valley period is a peak electricity consumption period, the power extraction ratio is set to a fourth power extraction ratio value, which is used to control the energy storage device to stop extracting power from the external power supply network.

[0051] If the current peak-valley period is a low-consumption period, an economic benefit value is calculated based on the electricity price associated with the low-consumption period, the load power consumption, and the photovoltaic power generation. The power extraction ratio is then set to a fifth power extraction ratio value based on the economic benefit value. The fifth power extraction ratio value is used to control the energy storage device and / or the internal grid load to extract power from the external power supply network.

[0052] According to another aspect of this application, a photovoltaic power generation charging and storage integrated control method for residential power is provided, applied to the photovoltaic power generation charging and storage integrated system for residential power provided in the above embodiments, the method comprising:

[0053] Obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device;

[0054] Calculate the photovoltaic power generation based on the output parameters and the current environmental parameters;

[0055] Detect the power consumption of the internal network load;

[0056] A power distribution instruction is generated based on the photovoltaic power generation capacity, the load power consumption, and the power consumption economic parameters. The power distribution instruction includes a charging-storage coefficient and a supply-extraction coefficient. The charging-storage coefficient is used to control the charging or discharging ratio of the energy storage device. The supply-extraction coefficient is used to control the power extraction or supply ratio from the external power supply network.

[0057] In response to the power distribution command, the connection state of the interface unit is set according to the charging and discharging coefficients and the charging and discharging coefficients.

[0058] According to another aspect of this application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described photovoltaic power generation charging and storage integrated control method applied to civilian electricity.

[0059] According to another aspect of this application, a storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the above-described integrated photovoltaic power generation charging and storage control method applied to civilian electricity.

[0060] Based on the above technical solution, this application provides a photovoltaic power generation charging and storage integrated system and its control method for use in residential electricity. The system includes a photovoltaic power generation device, an energy storage device, and an AC power distribution device. The AC power distribution device includes an interface unit and a controller. After acquiring the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device, the controller can calculate the photovoltaic power generation power based on these parameters. It then detects the load power consumption of the internal grid load and generates a power distribution command based on the photovoltaic power generation power, load power consumption, and electricity consumption economic parameters. The controller then sets the connection state of the interface unit according to the charging-storage coefficient and discharge coefficient in the power distribution command. The system can automatically determine the optimal adjustment strategy for photovoltaic power generation in residential electricity use. By optimizing the power distribution ratio during electricity consumption, it maximizes the economic benefits of electricity consumption while meeting the demand, thereby solving the problem that charging and discharging switching cannot adapt to the power demand of the power supply network.

[0061] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0062] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0063] Figure 1 This is a schematic diagram of the structure of a photovoltaic power generation, charging, and storage integrated system for residential electricity, provided in an embodiment of this application.

[0064] Figure 2 This is a schematic flowchart of a photovoltaic power generation and storage integrated control method for residential electricity, provided in an embodiment of this application.

[0065] Figure 3 This is a schematic diagram of the power factor setting process provided in an embodiment of this application;

[0066] Figure 4 This is a schematic diagram illustrating the working mechanism of an integrated photovoltaic power generation and charging / storage system for residential electricity applications, provided in an embodiment of this application.

[0067] Figure 5 This is a schematic diagram of the power distribution instruction generation process provided in an embodiment of this application;

[0068] Figure 6 A schematic diagram of the control flow of the adjustment strategy provided in the embodiments of this application.

[0069] Figure 7 This is a schematic diagram illustrating the working mode control of a photovoltaic power generation and storage integrated system applied to residential electricity, as provided in an embodiment of this application. Detailed Implementation

[0070] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0071] Photovoltaic power generation is a clean energy technology that uses solar panels to directly convert sunlight into electrical energy. These solar panels can be made of semiconductor materials such as silicon. When sunlight shines on the surface of a solar panel, photon energy excites electrons in the semiconductor material, causing them to transition from the valence band to the conduction band, thus creating electron-hole pairs. These electrons and holes are separated and collected under the influence of an electric field inside the panel, forming an electric current, thereby realizing the conversion of light energy into electrical energy.

[0072] The electricity generated by photovoltaic (PV) power generation can be connected to the power grid to power electrical equipment within the grid. However, solar energy is affected by time and weather conditions, resulting in a phased energy production cycle. During sunny days, when solar energy is abundant, PV power generation produces a significant amount of electricity. Conversely, at night or under cloudy or rainy conditions, when solar energy is insufficient, PV power generation produces little or no electricity. Therefore, to meet the power grid's demands, PV power generation equipment can be connected to energy storage devices to form a PV power generation and storage system.

[0073] Photovoltaic power generation charging and storage systems can adjust the charging and discharging control strategies of energy storage devices in real time according to sunlight conditions. When solar energy is abundant, the energy storage devices are controlled to enter a charging state to store the electricity generated by photovoltaic power generation; when solar energy is insufficient, the energy storage devices are controlled to enter a discharging state to meet the electricity demand at different times. However, this charging and discharging control strategy only performs charging and discharging switching according to a pre-set time period, which cannot adapt to the power demand of the power grid, increasing losses and reducing the economic efficiency of power supply.

[0074] To address the issue of charging and discharging switching failing to meet the power demand of the power supply network, some embodiments of this application provide an integrated photovoltaic power generation, charging, and storage system for residential power applications. For example... Figure 1 As shown, the system includes: a photovoltaic power generation device, an energy storage device, and an AC power distribution device.

[0075] A photovoltaic (PV) power generation device is used to convert solar energy into electrical energy. The device may include a photovoltaic panel and an inverter connected to the photovoltaic panel. The photovoltaic panel can be made of a semiconductor material such as silicon, and by doping with different types of impurities, it can form P-type and N-type semiconductors. A built-in electric field is formed at the interface between the P-type and N-type semiconductors. When sunlight shines on the surface of the photovoltaic panel, the energy of the photons is absorbed by the semiconductor material. According to the photoelectric effect, this energy causes electrons in the semiconductor to jump from the valence band to the conduction band, thus generating electron-hole pairs. Under the influence of the built-in electric field, the electron-hole pairs move to the N-type and P-type semiconductor regions respectively, thereby forming a current in the external circuit.

[0076] In some embodiments, a photovoltaic panel may include solar cells, encapsulation components, a frame, and a junction box. The solar cells are made of semiconductor materials such as monocrystalline silicon, polycrystalline silicon, or amorphous silicon. The surface of the solar cells undergoes texturing, diffusion, and other processes to improve their absorption efficiency and photoelectric conversion efficiency.

[0077] Encapsulation components may include glass, ethylene-vinyl acetate copolymer (EVA), and a backsheet. Glass, with its high light transmittance and good mechanical strength, protects the solar cells from external environmental influences. EVA, as a transparent, elastic material, acts as an adhesive and encapsulator, tightly bonding the solar cells to the glass and backsheet. The backsheet, with its excellent insulation and weather resistance, prevents the penetration of moisture and gases, protecting the back of the solar cells.

[0078] The frame is a structural design made of molded materials such as aluminum alloy, which possesses good mechanical strength and corrosion resistance. The frame serves to secure and protect the overall structure of the photovoltaic panel. The junction box connects to the output terminals of the photovoltaic panel, facilitating the output of generated electrical energy to external circuits.

[0079] Inverters convert the direct current (DC) generated by photovoltaic (PV) panels into alternating current (AC) to ensure that the electrical energy produced by the PV power generation system meets the needs of electrical equipment. The output power of PV panels varies with changes in sunlight intensity and temperature; therefore, inverters can also be used to achieve Maximum Power Point Tracking (MPPT) for PV power generation systems. This means that the MPPT module in the inverter can monitor the output of the PV panels in real time and adjust their operating state to ensure they always operate at their maximum power point, thereby maximizing power generation efficiency.

[0080] In some embodiments, the inverter used in a photovoltaic power generation and energy storage integrated system can be a string inverter. A string inverter may include a DC input terminal, an inverter module, a control module, a maximum power point tracking (MPPT) module, and an AC output terminal.

[0081] The DC input terminal receives the DC power output from the photovoltaic string. The inverter module converts the DC power into AC power through the cooperation of power switching devices, filter circuits, and drive circuits. For example, the power switching devices can be insulated gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs). The inverter achieves fast switching operation through the power switching devices, thereby converting DC power into AC power.

[0082] The control module, through a microcontroller and sensors monitoring parameters such as voltage, current, and temperature, monitors and controls the inverter's operating status, ensuring safe, stable, and efficient operation. The Maximum Power Point Tracking (MPPT) module, using a DC-DC converter, control chip, voltage and current sensors, monitors the output voltage and current of the photovoltaic string in real time and adjusts the operating point of the photovoltaic string according to a power adjustment algorithm, ensuring it is always at its maximum power point. The AC output terminal is used to output the converted AC power to the grid or load.

[0083] Photovoltaic power generation devices can be installed in well-lit spaces. Depending on electricity demand and available space, one or more sets of devices can be installed, and each set can include one or more photovoltaic panels. Multiple photovoltaic panels can be combined to create a larger solar radiation receiving area. For example, when photovoltaic power generation devices are used for residential electricity generation, the photovoltaic panels can be installed on building rooftops or vacant land.

[0084] Energy storage devices are used to convert electrical energy into other forms of energy that are easy to store, thus achieving the storage of electrical energy. Energy storage devices can be used to store electrical energy generated by photovoltaic power generation devices or to store electrical energy supplied by external power grids. By converting electrical energy into other forms of energy, energy storage devices can achieve energy storage and release, stabilizing power output under different environmental conditions. Furthermore, they can perform peak shaving and valley filling functions; during peak electricity demand periods, energy storage devices can release electrical energy to reduce the burden on the power grid, while during off-peak periods, energy storage devices can be charged, improving energy utilization efficiency.

[0085] An energy storage device may include an energy storage unit and a power conversion system (PCS) connected to the energy storage unit. The energy storage unit, as an energy storage unit, can convert electrical energy into other forms of energy. For example, the energy storage unit may be one or more of the following energy storage batteries: lithium-ion battery, lead-acid battery, flow battery, sodium-sulfur battery, etc.

[0086] Energy storage converters are used to achieve bidirectional conversion between direct current (DC) and alternating current (AC). They can convert the DC power from energy storage batteries into AC power for grid connection or supply to AC loads, and can also rectify the AC power from the grid back into DC power to charge energy storage batteries.

[0087] In some embodiments, the energy storage converter may include DC input / output terminals, an inverter / rectifier module, a control module, and AC input / output terminals. The DC input / output terminals can be connected to the energy storage battery of the energy storage device to receive or output DC power. The inverter / rectifier module can achieve bidirectional conversion between DC and AC power through functional units such as power switching devices, filter circuits, and drive circuits. The control module can achieve intelligent control of the energy storage converter based on operating parameters detected by sensors such as voltage, current, and temperature, through a microcontroller executing control algorithms and control logic, including inverter / rectifier control, protection functions, and power dispatching. The AC input / output terminals can be connected to the external power grid or electrical loads to achieve AC power input and output.

[0088] The AC power distribution device is used to distribute and control the AC power in the photovoltaic power generation and energy storage integrated system, safely and reliably distributing electrical energy to various electrical devices. It also provides multiple protection functions to ensure the stable operation of the power system. For example, the AC power distribution device can be an AC distribution cabinet. The AC power distribution device may include an interface unit and a controller connected to the interface unit. The interface unit is used to connect the power generation device and the electrical devices to realize power transmission. Therefore, the interface unit may include multiple interfaces, which can connect to different devices or equipment. That is, the interface unit connects the inverter and the energy storage converter; the interface unit also connects to the internal grid load and the external power supply network.

[0089] Internal grid load refers to the collection of power-consuming devices within the photovoltaic power generation, charging, and storage integrated system. Internal grid load may include electrical appliances that use the photovoltaic power generation, charging, and storage integrated system as their primary power source, such as residential air conditioners, induction cookers, and microwave ovens. Internal grid load may also include power supply equipment used to maintain the operation of the photovoltaic power generation, charging, and storage integrated system, such as monitoring equipment, security equipment, and intelligent management system equipment.

[0090] The external power supply network refers to the public power grid independent of the photovoltaic power generation and energy storage integrated system. For example, the external power supply network can be a 380V low-voltage power grid. The external power supply network can provide a continuous supply of electricity, but since it is a commercial power supply network, corresponding financial expenditures are required based on the amount of electricity consumed when using it.

[0091] An integrated system comprising photovoltaic (PV) power generation devices, energy storage devices, and AC power distribution devices can work in conjunction with an external power supply network to provide multi-source power to electrical equipment, including internal grid loads. For example, when the internal grid load is residential electricity, the PV power generation devices can supply power to residential users, charge the energy storage devices, and generate electricity for the public grid. Residential electricity can be supplied from the PV power generation devices, the energy storage devices, and the 380V low-voltage power from the public grid.

[0092] A controller is a control component with data processing capabilities. For example, a controller can be one or more processors such as a central processing unit, microprocessor, or system-on-a-chip (SoC). To control an integrated photovoltaic (PV) power generation and energy storage system used in residential electricity, the controller can be configured to execute a method for integrated PV power generation and energy storage in residential electricity applications, such as... Figure 2 As shown, the method includes:

[0093] S101. Obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device.

[0094] During the operation of the integrated system, the controller can acquire operating parameters of the system according to a preset control frequency, analyze and judge based on the acquired operating parameters, and generate control commands to control the various devices in the system. The acquired operating parameters may include the output parameters of the photovoltaic power generation device, current environmental parameters, and electricity consumption economic parameters.

[0095] The output parameters of a photovoltaic (PV) power generation device characterize its power generation status and may include parameters such as output current, output voltage, and output power. The controller can acquire these output parameters through parameter detection sensors installed in the connection circuit between the interface unit and the PV power generation device. For example, a voltmeter and an ammeter can be installed in the connection circuit to detect the output voltage and output current, respectively. After acquiring the output voltage and current, the controller can calculate their product to obtain the output power.

[0096] In addition to the aforementioned parameters such as output current, output voltage, and output power, the output parameters of a photovoltaic power generation device can also include other types of parameters. For example, output parameters may also include the rated power of the photovoltaic power generation device, inverter efficiency, operating temperature, operating time (duration), and fault information. These output parameters can reflect the operating status of the photovoltaic power generation device, thereby enabling auxiliary control of the photovoltaic power generation process.

[0097] Environmental parameters are combinations of various parameters used to represent the current operating environment of a photovoltaic power generation device. Since the environment changes dynamically with time, weather, climate, and other factors, the controller can acquire the current environmental parameters in real time based on the operating time when control is required.

[0098] Current environmental parameters can include operating time, location information, weather information, etc. The controller can acquire current environmental parameters through sensors with environmental monitoring capabilities, or it can acquire them from a server connected to an environmental monitoring system.

[0099] Electricity consumption economic parameters refer to a set of parameters that can affect power generation revenue and electricity consumption expenditure. For example, electricity consumption economic parameters may include electricity prices, operating costs, and peak-valley periods. These parameters can be pre-set based on the specific application location of the photovoltaic power generation and energy storage integrated system, or obtained from a customer service system connected to the external power supply network.

[0100] In some embodiments, to obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device, the controller can generate data acquisition instructions according to a set control frequency and send these instructions to the corresponding providing devices for each parameter. The providing devices can differ for different operating parameters; for example, the providing device for output parameters might be an energy sensor (voltage sensor, current sensor, etc.); the providing device for current environmental parameters might be an environmental monitoring sensor and / or a server; and the providing device for electricity consumption economic parameters might be a cloud storage unit or a local storage unit. Upon receiving the data acquisition instructions, the providing devices can send the requested operating data corresponding to the instructions to the controller, enabling the controller to obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device.

[0101] S102. Calculate the photovoltaic power generation based on the output parameters and the current environmental parameters.

[0102] After acquiring the output parameters and current environmental parameters, the controller can calculate the photovoltaic power generation based on these parameters. In some embodiments, to calculate the photovoltaic power generation, the controller can first extract the rated power of the photovoltaic panel and the inverter's inverter efficiency from the output parameters, and then set the power factor based on the current environmental parameters.

[0103] The power factor is an output influence parameter determined based on current environmental parameters. Since the power generation efficiency and output of photovoltaic power generation devices vary under different lighting conditions, and factors affecting power generation efficiency and output include time and lighting conditions, the controller can calculate the power factor based on relevant information about operating time and lighting conditions in the current environmental parameters.

[0104] like Figure 3 As shown, in order to calculate the power factor, in some embodiments, when the controller executes the power factor setting based on the current environmental parameters, it can first read the working time from the current environmental parameters and determine the time period in which the working time falls. If the working time is during a non-sunlight period, the power factor is set to 0, that is, during the non-sunlight period, the power generation of the photovoltaic power generation device is 0, and the photovoltaic power generation device cannot output electrical energy. Here, the non-sunlight period generally refers to conditions where the sunlight conditions cannot meet the energy conversion requirements of the photovoltaic power generation device, such as nighttime, rainy days, maintenance periods, and periods of shading.

[0105] If the working time falls within a period of daylight, the light intensity can be obtained, and the power coefficient can be calculated based on the light intensity. The power coefficient is positively correlated with the light intensity.

[0106] In some embodiments, light intensity can be obtained by querying weather information provided by a server. Specifically, the system further includes a server that establishes a communication connection with the controller. When the controller executes the request to obtain light intensity, it can generate a weather information query instruction based on the working time, send the weather information query instruction to the server, and receive weather data from the server in response to the weather information query instruction. After obtaining the weather data, the controller reads light intensity impact information from the weather data, which includes at least one of cloud information, atmospheric composition information, and geographic information. The controller then calculates the light intensity based on the light intensity impact information, whereby the light intensity is a weighted sum of the light intensity impact information.

[0107] After calculating the power factor, the controller then generates the photovoltaic power by calculating the product of the rated power, the inverter power generation efficiency, and the power factor.

[0108] For example, the more photovoltaic panels installed, the higher the construction cost. Similarly, the larger the energy storage device, the higher the equipment purchase cost. Therefore, for specific residential users' electricity consumption, engineering experience can be derived based on the actual situation of the photovoltaic power generation site and the electricity demand of the service area. It is advisable that the output of photovoltaic power generation should be greater than the maximum load output of residential electricity, preferably 1.2 times. The charging and discharging capacity of the energy storage device should be 1.5 times the average daily electricity consumption of residential electricity.

[0109] When a resident's household appliances, including air conditioners, induction cookers, and microwave ovens, have a combined power output of 10kW, considering the simultaneous and seasonal nature of electricity consumption, their maximum load is 5.6kW, average load is 1.5kW, and average daily electricity consumption is 36kWh, resulting in a monthly electricity consumption of approximately 1000kWh. For such a user, a photovoltaic (PV) power generation capacity of 7kW and an energy storage capacity of 25kWh*2 hours could be chosen. Since the inverter efficiency of PV panels is around 81%, the maximum output of PV power generation can reach over 5.6kW, meeting the maximum electricity load demand of the resident.

[0110] When calculating photovoltaic power generation, a rated power of 7kW photovoltaic power generation capacity is used, and an inverter efficiency of 81% is obtained. Weather data is then acquired according to the current working time, and cloud information, atmospheric composition information, and geographical information are extracted from the weather data. The power coefficient 'a' is calculated through interval mapping or correlation of values. p ,Right now:

[0111] a p =k1×p c +k2×p a +k3×p p ;

[0112] Among them, a p Represents the power coefficient; k1, k2, and k3 are the weighting coefficients for cloud information, atmospheric composition information, and geographic information, respectively; p c A quantitative score for cloud information; p a A quantitative score for atmospheric composition information; p p A quantitative score for geographic location information.

[0113] Calculate the power coefficient a p Then, the controller can calculate the product of rated power, inverter generation efficiency, and power factor, i.e., the power factor a. p When the value is 0.7, the photovoltaic power generation is 7 × 0.81 × 0.7 = 3.969 kW.

[0114] S103. Detect the power consumption of the internal network load.

[0115] After calculating the photovoltaic power generation, the controller can detect the load power consumption of the internal grid loads during the current operating time. Load power consumption can be obtained through power detection sensors such as power meters. These power detection sensors can be installed on the main circuit of the internal grid load connection interface unit. When it is necessary to obtain the load power consumption, the controller can generate a power detection command and send it to the power detection sensor to obtain the load power consumption detected by the sensor.

[0116] The load power consumption can also be obtained by statistically analyzing the internal grid load and estimating the power consumption based on the analysis results. Specifically, in some embodiments, the controller can record the power consumption of the internal grid load during the operation of the photovoltaic power generation and energy storage integrated system. Then, nonlinear fitting is performed on the recorded data within a certain operating cycle to obtain a fitting function for the load power consumption over time. When it is necessary to obtain the load power consumption, the current operating time can be obtained and input into the fitting function to calculate the current load power consumption.

[0117] S104. Generate a power distribution command based on the photovoltaic power generation capacity, the load power consumption, and the power consumption economic parameters.

[0118] After acquiring the load power consumption, the controller can generate power distribution commands based on the photovoltaic power generation, the load power consumption, and the electricity consumption economic parameters. These power distribution commands are used to control the on / off states of various switches in the interface unit, thereby switching the operating mode of the integrated photovoltaic power generation, charging, and storage system. Figure 4 As shown.

[0119] The power distribution command may include a charging / storage coefficient and a supply / extraction coefficient. The charging / storage coefficient sets the charging and discharging states of the energy storage device in numerical form. For example, when the energy storage coefficient is greater than a certain set threshold, the energy storage device enters a charging state, and when the energy storage coefficient is less than a certain set threshold, the energy storage device enters a discharging state. Furthermore, the charging / storage coefficient can also be used to control the charging or discharging ratio of the energy storage device. When the energy storage coefficient is greater than the set threshold, the larger the charging / storage coefficient, the higher the charging ratio, the higher the charging power of the energy storage device, and the more electrical energy the energy storage device stores per unit time.

[0120] Similarly, the supply coefficient also sets the power intake and supply status of the external power supply network in numerical form. For example, when the supply coefficient is greater than a set threshold, the system supplies power to the external power supply network; and when the supply coefficient is less than the set threshold, the system draws power from the external power supply network. Furthermore, the supply coefficient is used to control the proportion of power intake or supply to the external power supply network. For example, when the supply coefficient is greater than the set threshold, the larger the supply coefficient, the more electrical energy the system supplies to the external power supply network.

[0121] Distribution commands can be influenced by one or more of the following: photovoltaic power generation capacity, load power consumption, and electricity economic parameters. For example... Figure 5As shown, in some embodiments, when the controller generates a power distribution command based on the photovoltaic power generation, the load power consumption, and the electricity consumption economic parameters, it can first obtain a preset charging-storage coefficient threshold and compare the photovoltaic power generation with the load power consumption. If the photovoltaic power generation is greater than or equal to the load power consumption, the charging-storage coefficient is set to a first charging-storage coefficient value, and the power distribution command is generated based on the first charging-storage coefficient value. The first charging-storage coefficient value is greater than the preset charging-storage coefficient threshold.

[0122] For example, if the preset charging-storage coefficient threshold is 0, then when the charging-storage coefficient is greater than 0, the energy storage device enters the charging state. Therefore, the system can determine whether the photovoltaic power generation is greater than the load power consumption. If the photovoltaic power generation is greater than the load power consumption, the grid load is directly powered by the photovoltaic power generation. The remaining energy after supplying the grid load is then supplied to the energy storage device or fed into the public low-voltage grid. At this time, the system can determine whether the energy storage device is fully charged. If it is not fully charged, it charges the energy storage device; if the energy storage device is fully charged, it can be connected to the low-voltage grid for power transmission. Figure 6 As shown.

[0123] To ensure that the photovoltaic power generation device's external power supply activities (charging the energy storage device and transmitting power to the external power grid) do not affect the normal operation of the internal grid load, the controller can set the charging power of the energy storage device by setting a charging-storage coefficient. For example, when the charging-storage coefficient is set to a first storage coefficient value ac1 that is greater than 0, the controller can generate a power distribution command that includes the first storage coefficient value ac1. After sending the power distribution command to the energy storage device, the energy storage device can perform the charging operation according to the charging power corresponding to the first storage coefficient value ac1.

[0124] Similarly, if the photovoltaic power generation is less than the load power consumption, it indicates that the current photovoltaic power generation cannot meet the operational needs of the grid load. Therefore, the energy storage device can enter a discharge state by setting the charging-storage coefficient to a second charging-storage coefficient value that is less than the preset charging-storage coefficient threshold. Then, a power distribution command is generated based on the second charging-storage coefficient value. After the power distribution command is sent to the energy storage device, the energy storage device can supply power to the grid load according to the discharge power corresponding to the second charging-storage coefficient value to compensate for the power shortfall in photovoltaic power generation.

[0125] For example, if the preset charging-storage coefficient threshold is 0, when the photovoltaic power generation is less than the load power, the photovoltaic power generation device needs to directly supply power to the load. In this case, the remaining power of the energy storage device can be determined. When the remaining power meets the power supply demand, the charging-storage coefficient can be set to -ad. A negative charging-storage coefficient can control the energy storage device's power supply to the outside, and the larger the absolute value of the charging-storage coefficient, the greater the power supplied by the energy storage device. If the remaining power in the energy storage device is insufficient, power can be drawn from the low-voltage grid.

[0126] While setting the charging-storage coefficient, the controller can also set the supply-deposit coefficient based on the relationship between photovoltaic power generation and load power consumption to control the system's power intake and supply status from the external power grid. Therefore, in some embodiments, the controller can also calculate the power difference between the photovoltaic power generation and the load power consumption, and obtain the charging-storage power of the energy storage device, where the charging-storage power includes charging power and discharging power. When the power difference is greater than or equal to 0, it indicates that the current photovoltaic power generation can meet the power demand of the internal grid load; therefore, the supply-deposit coefficient can be set by comparing the charging power and the power difference.

[0127] In some embodiments, when the controller sets the supply coefficient by comparing the charging power and the power difference, it can set the operating state of the energy storage device to a charging state and obtain the current charging power of the energy storage device in the charging state. If the power difference is greater than or equal to the current charging power, the power supply ratio is set to a first power supply ratio value, so that the photovoltaic power generation device supplies power to the external power supply network according to the first power supply ratio value.

[0128] For example, after obtaining the photovoltaic power generation P1 and the load power consumption P2, the power difference (P1-P2) between the photovoltaic power generation P1 and the load power consumption P2 can be calculated, representing the degree of surplus of photovoltaic power generation over the load power consumption of the internal grid. If the power difference is greater than or equal to 0, that is, the photovoltaic power generation P1 ≥ the load power consumption P2, the current charging power P3 of the energy storage device can be obtained. By comparing the power difference (P1-P2) and the current charging power P3, if the power difference (P1-P2) ≥ the current charging power P3, it indicates that the current photovoltaic power generation has a good surplus. Therefore, the power supply ratio can be set as the first power supply ratio value based on the difference between the power difference and the current charging power ((P1-P2)-P3), thereby realizing the purpose of photovoltaic power generation device supplying power to external power grid.

[0129] Similarly, if the power difference is less than the current charging power, it means that the current surplus of photovoltaic power generation is insufficient to meet the charging needs of the current energy storage device. Therefore, the power extraction ratio can be set to a first power extraction ratio value so that the energy storage device can extract power from the external power supply network according to the first power extraction ratio value to meet the charging needs of the energy storage device.

[0130] When the power difference is less than 0, the controller can set the supply coefficient by comparing the discharge power and the power difference. In some embodiments, to set the supply coefficient, the controller can set the energy storage device's operating state to a discharge state and set the power supply ratio to a second power supply ratio value. The second power supply ratio value is used to control the photovoltaic power generation device to stop supplying power to the external power network. Then, in the discharge state, the current discharge power and current remaining power of the energy storage device are obtained, and the supply coefficient is set by comparing the absolute value of the power difference with the current discharge power.

[0131] If the absolute value of the power difference is greater than or equal to the current discharge power, it indicates that when the power is supplied to the internal network load through the discharge of the energy storage device, the power demand of the internal network load still cannot be met. Therefore, the power extraction ratio can be set to a second power extraction ratio value so that the internal network load can extract power from the external power supply network according to the second power extraction ratio value.

[0132] For example, after obtaining the photovoltaic power generation P1 and the load power consumption P2, the power difference (P1-P2) between the photovoltaic power generation P1 and the load power consumption P2 can be calculated. If the power difference is less than 0, that is, the photovoltaic power generation P1 is less than the load power consumption P2, it indicates that the current photovoltaic power generation cannot meet the power demand of the internal grid load. In this case, the absolute value of the power difference |P1-P2| can be used to represent the degree of gap between photovoltaic power generation and the internal grid load power consumption. Furthermore, the controller obtains the current discharge power P4 of the energy storage device. By comparing the absolute value of the power difference |P1-P2| with the current discharge power P4, it is found that when the absolute value of the power difference |P1-P2| ≥ the current discharge power P4, it indicates that the current photovoltaic power generation has a large power gap and it is necessary to draw power from the external power supply network. Therefore, the power drawing ratio can be set as the second power drawing ratio value according to the difference between the absolute value of the power difference |P1-P2| and the current discharge power (|P1-P2|-P4), so as to achieve the purpose of the internal grid load drawing power from the external power supply network according to the power drawing power corresponding to (|P1-P2|-P4).

[0133] If the absolute value of the power difference is less than the current discharge power, it indicates that the current discharge power of the energy storage device can meet the power demand of the grid load. However, since the energy storage device, as an energy storage device, can compensate for the power supply gap of photovoltaic power generation to the grid load, in addition to the discharge power, it is also affected by the remaining power. Therefore, the controller can obtain the current remaining power and determine whether the current remaining power meets the power threshold. When the current remaining power is greater than or equal to the power threshold, it can be determined that the current energy storage device can compensate for the power supply gap of photovoltaic power generation to the grid load for a certain period of time. Therefore, by setting the energy storage device to enter the discharge mode, the combined power supply to the grid load through the photovoltaic power generation device and the energy storage device can be realized.

[0134] When the current remaining power is less than the power threshold, the controller can set the power extraction ratio to a third power extraction ratio value based on the current remaining power, so that the energy storage device can extract power from the external power supply network according to the third power extraction ratio value when the current remaining power is less than the power threshold.

[0135] Since photovoltaic (PV) power generation is related to both sunlight intensity and the number of PV panels, the clearer the weather and the better the sunlight conditions, the more abundant the PV power supply. The more PV panels installed, the greater the PV power generation. Therefore, through the system control method provided in the above embodiments, it is possible to ensure that, under the same PV power output, the greater the electricity consumption of the internal grid load, the more PV power is supplied to the internal grid load. Conversely, the smaller the electricity consumption of the internal grid load, the more PV power can be used to supply household electricity, charge energy storage devices, or be directly connected to the public grid. At night or during the night, when PV power generation stops, the energy storage devices can discharge and directly supply household electricity.

[0136] Based on the control strategy provided in the above embodiments, since the power supply cost of the external power supply network changes dynamically with the electricity consumption period, for example, during peak daytime electricity price periods (8:00-22:00), the external power supply network price is 0.59 yuan / kWh; during off-peak evening electricity price periods (22:00-8:00), the external power supply network price is 0.36 yuan / kWh. Photovoltaic power generation also incurs certain operating costs and power supply revenue. Therefore, in some embodiments, electricity consumption economic parameters can be referenced when generating distribution instructions. That is, by generating distribution instructions based on photovoltaic power generation capacity, load power consumption, and electricity consumption economic parameters, and utilizing time-of-use pricing strategies to optimize the integrated control strategy of photovoltaic power generation and charging / storage, the economic benefits of residential electricity consumption can be maximized.

[0137] That is, when the controller executes the power distribution command based on the photovoltaic power generation, the load power consumption and the power consumption economic parameters, it can first extract the peak-valley interval and the associated electricity price from the power consumption economic parameters, and then determine the current peak-valley period based on the current working time and the peak-valley interval.

[0138] For example, the controller can obtain the current working time T and extract the daytime peak electricity price period (8:00-22:00) and the evening off-peak electricity price period (22:00-8:00) from the electricity consumption economic parameters. When the current working time T falls within the peak electricity price period (8:00-22:00), the current peak-valley period can be determined as the peak electricity consumption period; when the current working time T falls within the evening off-peak electricity price period (22:00-8:00), the current peak-valley period can be determined as the off-peak electricity consumption period.

[0139] If the current peak-valley period is a peak electricity consumption period, the power extraction ratio can be set to a fourth power extraction ratio value. This fourth power extraction ratio value is used to control the energy storage device to stop drawing power from the external power supply network. That is, during peak electricity consumption periods, the system will not charge the energy storage device through the external power supply network.

[0140] If the current peak-valley period is a low-consumption period, then an economic benefit value is calculated based on the electricity price associated with the low-consumption period, the load power consumption, and the photovoltaic power generation. The power extraction ratio is then set to a fifth power extraction ratio value based on the economic benefit value. The fifth power extraction ratio value is used to control the energy storage device and / or the internal grid load to extract power from the external power supply network.

[0141] For example, when the current peak-valley period is a low-consumption period, the economic benefit value can be calculated based on the electricity price Pr, the load power P2, and the energy storage device charging power P3. Specifically, the product of the electricity price Pr and the load power P2, Pr*P2, is calculated, and simultaneously, the product of the electricity price Pr and the charging power P3, Pr*P3, is also calculated. The economic benefit value is then calculated as (Pr*P2 + Pr*P3). This economic benefit value is then compared with a pre-set benefit threshold P0 based on operating costs. When the economic benefit value (Pr*P2 + Pr*P3) is less than the benefit threshold P0, it indicates that the current benefit of drawing power from the external power supply network is greater. Therefore, the power drawing ratio can be set to the fifth power drawing ratio value based on the economic benefit value (Pr*P2 + Pr*P3) to control the energy storage device and / or the internal network load to draw power from the external power supply network.

[0142] In some embodiments, if the current peak-valley period is a low-consumption period, an economic benefit value is calculated based on the electricity price associated with the low-consumption period, the load power consumption, and the photovoltaic power generation. The power extraction ratio is then set to a fifth power extraction ratio value, and / or the power supply ratio is set to a third power supply ratio value. The fifth power extraction ratio value is used to control the energy storage device and / or the internal grid load to extract power from the external power supply network; the third power supply ratio value is used to control the photovoltaic power generation device to supply power to the external power supply network.

[0143] For example, the energy storage device can discharge up to 100 kWh, which is 1.5 times the average daily electricity consumption of residential users. This allows the energy storage device to continuously supply electricity to residential users for about two days when photovoltaic power generation is insufficient due to bad weather. Even if it cannot reach two days, the energy storage device can at least supply electricity to residential users during peak electricity price periods (8:00-22:00, electricity price 0.59 yuan / kWh) during the daytime peak electricity price period (22:00-8:00, electricity price 0.36 yuan / kWh) during the nighttime off-peak electricity price period, and the energy storage device can be fully charged to continue serving the electricity demand of the next day, thereby maximizing the economic benefits of residential electricity.

[0144] S105. In response to the power distribution command, the connection state of the interface unit is set according to the charging and discharging coefficient and the charging and discharging coefficient.

[0145] After generating the power distribution command, the controller can set the connectivity of the photovoltaic power generation device, energy storage device, internal grid load and external power supply network according to the connection status of the interface units of the charging and discharging coefficients in the power distribution command, so as to implement the system control strategy.

[0146] For example, the system determines the energy storage device's status by analyzing the weather and working hours. If it's daytime, it checks for remaining power from the photovoltaic (PV) power generation. If there is remaining power, it sets the interface unit's connectivity according to the charging and discharging coefficients, enabling the energy storage device to enter charging mode and draw power from the PV power generation until fully charged. If there is no remaining power, it sets the interface unit's connectivity according to the charging and discharging coefficients, controlling the energy storage device to enter discharging mode whenever power is available, directly supplying electricity to residential users. If it's nighttime, the system checks for remaining power from the photovoltaic energy storage device. If there is remaining power, the energy storage device enters discharging mode and directly supplies electricity to residential users. If there is no remaining power, the energy storage device enters charging mode and draws power from the low-voltage grid until fully charged. Figure 7 As shown.

[0147] By applying the technical solutions of the above embodiments, this application provides a photovoltaic power generation and energy storage integrated system and its control method. The system includes a photovoltaic power generation device, an energy storage device, and an AC power distribution device. The AC power distribution device includes an interface unit and a controller. After acquiring the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device, the controller can calculate the photovoltaic power generation power based on the output parameters and current environmental parameters. It then detects the load power consumption of the internal grid load and generates a power distribution command based on the photovoltaic power generation power, load power consumption, and electricity consumption economic parameters. This command sets the connection state of the interface unit according to the charging / storage coefficient and discharging / extraction coefficient in the power distribution command. The system can automatically determine the optimal adjustment strategy for photovoltaic power generation in residential electricity use. By optimizing the power distribution ratio coefficient during electricity consumption, it maximizes the economic benefits of electricity consumption while meeting electricity demand, thereby solving the problem that charging / discharging switching cannot adapt to the power demand of the power supply network.

[0148] This application also provides a computer device, specifically a personal computer, server, network device, etc. The computer device includes a bus, processor, memory, and communication interface, and may also include input / output interfaces and a display device. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the computer device stores location information. The network interface of the computer device is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the various method embodiments.

[0149] Those skilled in the art will understand that the structure of the computer device described above is only a partial structure related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. A specific computer device may include more or fewer components, or combine certain components, or have different component arrangements.

[0150] In one embodiment, a computer-readable storage medium is also provided, which may be non-volatile or volatile, and a computer program is stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0151] In one embodiment, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0152] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0153] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. 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 methods.

[0154] Any references to memory, database, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc.

[0155] Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can take many forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0156] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchain. The processors involved in the embodiments provided in this application may be, but are not limited to, general-purpose processors, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc.

[0157] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0158] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A photovoltaic power generation, charging, and energy storage integrated system for residential electricity use, characterized in that, The system includes: A photovoltaic power generation device, including a photovoltaic panel and an inverter connected to the photovoltaic panel; An energy storage device, comprising an energy storage unit and an energy storage converter connected to the energy storage unit; An AC power distribution device includes an interface unit and a controller connected to the interface unit; the interface unit connects to the inverter and the energy storage converter; the interface unit also connects to an internal network load and an external power supply network; the controller is configured to: Obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device; Calculate the photovoltaic power generation based on the output parameters and the current environmental parameters; Detect the power consumption of the internal network load; A power distribution command is generated based on the photovoltaic power generation capacity, the load power consumption, and the power consumption economic parameters. The power distribution command includes a charging-storage coefficient and a supply-extraction coefficient. The charging-storage coefficient is used to control the charging or discharging ratio of the energy storage device. The supply-extraction coefficient is used to control the power extraction or supply ratio from the external power supply network. In response to the power distribution command, the connection state of the interface unit is set according to the charging and discharging coefficients and the charging and discharging coefficients.

2. The system according to claim 1, characterized in that, The controller performs calculations of photovoltaic power generation based on the output parameters and the current environmental parameters, and is further configured to: The rated power of the photovoltaic panel and the inverter power generation efficiency of the inverter are extracted from the output parameters. Set the power coefficient according to the current environmental parameters; The product of the rated power, the inverter power generation efficiency, and the power coefficient is calculated to generate the photovoltaic power generation.

3. The system according to claim 2, characterized in that, The controller performs the setting of the power coefficient based on the current environmental parameters and is also configured to: Read the working time from the current environmental parameters; If the working time is during a non-sunlight period, the power coefficient is set to 0; If the working time is during a period of daylight, the light intensity is obtained, and the power coefficient is calculated based on the light intensity, wherein the power coefficient is positively correlated with the light intensity.

4. The system according to claim 3, characterized in that, The system also includes a server, which establishes a communication connection with the controller; the controller performs tasks such as acquiring light intensity and is further configured to: Generate a weather information query instruction based on the working hours; Send the weather information query command to the server and receive weather data from the server in response to the weather information query command; Light intensity impact information is read from the weather data, and the light intensity impact information includes at least one of cloud information, atmospheric composition information, and geographic information; The light intensity is calculated based on the light intensity influence information, and the light intensity is the weighted sum of the light intensity influence information.

5. The system according to claim 1, characterized in that, The controller generates power distribution instructions based on the photovoltaic power generation, the load power consumption, and the electricity consumption economic parameters, and is also configured to: Obtain the preset storage coefficient threshold; If the photovoltaic power generation is greater than or equal to the load power, the charging-storage coefficient is set to a first charging-storage coefficient value, and the power distribution instruction is generated based on the first charging-storage coefficient value; the first charging-storage coefficient value is greater than the preset charging-storage coefficient threshold. If the photovoltaic power generation is less than the load power, the charging and storage coefficient is set to a second charging and storage coefficient value, and the power distribution command is generated based on the second charging and storage coefficient value; the second charging and storage coefficient value is less than the preset charging and storage coefficient threshold.

6. The system according to claim 5, characterized in that, The controller is also configured to: Calculate the power difference between the photovoltaic power generation and the load power consumption; The charging power of the energy storage device is obtained, wherein the charging power includes charging power and discharging power; When the power difference is greater than or equal to 0, the supply coefficient is set by comparing the charging power and the power difference; When the power difference is less than 0, the supply coefficient is set by comparing the discharge power and the power difference.

7. The system according to claim 6, characterized in that, The controller performs the operation of setting the supply coefficient by comparing the charging power and the power difference, and is also configured to: The energy storage device is set to a charging state. Obtain the current charging power of the energy storage device under the charging state; If the power difference is greater than or equal to the current charging power, the power supply ratio is set to a first power supply ratio value so that the photovoltaic power generation device supplies power to the external power supply network according to the first power supply ratio value. If the power difference is less than the current charging power, the power extraction ratio is set to a first power extraction ratio value so that the energy storage device can extract power from the external power supply network according to the first power extraction ratio value.

8. The system according to claim 6, characterized in that, The controller performs the operation of setting the supply coefficient by comparing the discharge power and the power difference, and is further configured to: The energy storage device is set to a discharge state, and the power supply ratio is set to a second power supply ratio value; the second power supply ratio value is used to control the photovoltaic power generation device to stop supplying power to the external power supply network. The current discharge power and current remaining power of the energy storage device are obtained under the discharge state. If the absolute value of the power difference is greater than or equal to the current discharge power, the power extraction ratio is set to a second power extraction ratio value so that the internal network load extracts power from the external power supply network according to the second power extraction ratio value; If the absolute value of the power difference is less than the current discharge power, the power extraction ratio is set to a third power extraction ratio value based on the current remaining power, so that when the current remaining power is less than the power threshold, the energy storage device can extract power from the external power supply network according to the third power extraction ratio value.

9. The system according to claim 1, characterized in that, The controller generates power distribution instructions based on the photovoltaic power generation, the load power consumption, and the electricity consumption economic parameters, and is also configured to: Extract peak-valley intervals and associated electricity prices from the electricity consumption economic parameters; The current peak-valley time period is determined based on the current working time and the aforementioned peak-valley interval; If the current peak-valley period is a peak electricity consumption period, the power extraction ratio is set to a fourth power extraction ratio value, which is used to control the energy storage device to stop extracting power from the external power supply network. If the current peak-valley period is a low-consumption period, an economic benefit value is calculated based on the electricity price associated with the low-consumption period, the load power consumption, and the photovoltaic power generation. The power extraction ratio is then set to a fifth power extraction ratio value based on the economic benefit value. The fifth power extraction ratio value is used to control the energy storage device and / or the internal grid load to extract power from the external power supply network.

10. A photovoltaic power generation, charging, and energy storage integrated control method applied to residential power supply, characterized in that, Applied to the system according to any one of claims 1-9, the method comprises: Obtain the output parameters, current environmental parameters, and electricity consumption economic parameters of the photovoltaic power generation device; Calculate the photovoltaic power generation based on the output parameters and the current environmental parameters; Detect the power consumption of the internal network load; A power distribution instruction is generated based on the photovoltaic power generation capacity, the load power consumption, and the power consumption economic parameters. The power distribution instruction includes a charging-storage coefficient and a supply-extraction coefficient. The charging-storage coefficient is used to control the charging or discharging ratio of the energy storage device. The supply-extraction coefficient is used to control the power extraction or supply ratio from the external power supply network. In response to the power distribution command, the connection state of the interface unit is set according to the charging and discharging coefficients and the charging and discharging coefficients.

Images