Household photovoltaic energy storage management system and control method thereof

Abstract

The present invention provides a household photovoltaic energy storage management system and a control method thereof. The household photovoltaic energy storage management system includes: a solar photovoltaic panel, which is arranged in the illuminated area of ​​the home and generates electricity using light; an energy storage battery, which is used to store and release electricity; a wireless current sensor, which is arranged on the household line of the power grid and is used to collect the current direction and / or size on the household line; an electric energy conversion device, which is connected to the wireless current sensor signal through a wireless transmission method, and is configured to convert the electric energy between the solar photovoltaic panel, the energy storage battery, and the external power grid in a controlled manner according to the current direction and / or size. The electric energy conversion device can timely adjust the working status of the solar photovoltaic panel and the energy storage battery, improve the efficiency and economic benefits of electric energy use, and reduce the power fluctuation of the power grid.

Description

Technical Field

[0001] The present invention relates to energy storage technology, and in particular to a household photovoltaic energy storage management system and a control method thereof. Background Art

[0002] The home solar energy storage management system is a solution that integrates solar photovoltaic (PV) power generation, energy storage devices (such as lithium batteries), and intelligent control equipment. Its main purpose is to achieve home energy self-sufficiency, energy saving and high efficiency, and grid interaction.

[0003] The household photovoltaic energy management system converts solar energy into electricity through the photovoltaic panels installed on the roof or balcony. The excess electricity is stored in the energy storage battery, and the AC-DC conversion is performed using power conversion equipment such as micro inverters. For example, the balcony photovoltaic energy management system hangs the photovoltaic panels on the balcony. It has the characteristics of a small number of photovoltaic panels, small space occupation, simple design, construction and installation, and can be connected to the power grid through standard connectors, without professional wiring, and can be plug-and-play.

[0004] Home photovoltaic energy storage management systems have good availability, but generally do not have the data analysis capabilities of large-scale photovoltaic storage systems. For example, they lack the ability to obtain data from the power grid (smart meters will not open data to home photovoltaic energy storage management systems). This causes the home photovoltaic energy storage management system to work according to the set strategy, resulting in problems such as low electricity efficiency and poor economic benefits. Summary of the invention

[0005] One purpose of the present invention is to enable a household photovoltaic energy storage management system to adjust the operating status of solar photovoltaic panels and energy storage batteries according to the household electricity consumption.

[0006] A further object of the present invention is to ensure that the household photovoltaic energy storage management system is easy to install and avoid complex wiring.

[0007] Another further object of the present invention is to improve the efficiency of the household photovoltaic energy storage management system and reduce household electricity costs.

[0008] In particular, the present invention provides a household photovoltaic energy storage management system. The household photovoltaic energy storage management system comprises:

[0009] Solar photovoltaic panels are used to be placed in light-exposed areas of the home and use sunlight to generate electricity;

[0010] Energy storage batteries, used to store and release electrical energy;

[0011] A wireless current sensor is arranged on the household line of the power grid and is used to collect the direction and / or magnitude of the current on the household line;

[0012] The electric energy conversion device is connected to the wireless current sensor signal by wireless transmission, and is configured to convert the electric energy between the solar photovoltaic panel, the energy storage battery, and the external power grid in a controlled manner according to the direction and / or size of the current.

[0013] Optionally, the wireless current sensor is a snap-on wireless current transformer, and the household line is passed through a threading hole of the snap-on wireless current transformer; and

[0014] The power conversion device and the wireless current sensor are connected through any of the following communication methods: LoRa, Bluetooth, Zigbee, Sigfox.

[0015] Optionally, the electric energy conversion device is further configured to:

[0016] Determine the direction of power transmission on the household line as receiving or supplying power according to the direction of the current; and determine the receiving current value or the supply current value according to the magnitude of the current;

[0017] When the receiving current value is within the set discharge threshold range, the stored electric energy of the energy storage battery is controlled to be released outward;

[0018] When the supply current value is within the set charging threshold range, the energy storage battery is controlled to be charged to store electrical energy.

[0019] Optionally, before controlling the electric energy stored in the energy storage battery to be released externally or controlling the energy storage battery to be charged to store electric energy, the method further includes:

[0020] Predict the lighting status of solar photovoltaic panels and household electricity load during the release of energy from energy storage batteries or charging;

[0021] Determine whether the fluctuation of power supply and demand caused by the lighting status and household power load is less than the set change rate;

[0022] If so, the step of controlling the stored electric energy of the energy storage battery to be released externally or controlling the charging of the energy storage battery to store electric energy is executed.

[0023] Optionally, when the fluctuation of the illumination state and the power load is greater than the set change rate, the power conversion device is further configured to:

[0024] According to the light conditions and the fluctuation of power load, the state adjustment instructions are sent to the electrical equipment in the home to reduce the fluctuation of power supply and demand caused by the light conditions and power load.

[0025] Optionally, the electric energy conversion device is further configured to:

[0026] When the light condition deteriorates, causing the power generation of the solar photovoltaic panel to decrease or the power load to increase, an adjustment instruction is issued to the electrical equipment in the home to shut down and / or reduce the operating power;

[0027] When the lighting conditions improve, resulting in an increase in the power generation of the solar photovoltaic panels or a decrease in the power load, adjustment instructions are sent to the electrical devices in the home to start up and / or increase the operating power.

[0028] Optionally, the discharge threshold range and the charge threshold range are set according to the appropriate operating current of the energy storage battery, wherein

[0029] The maximum value of the discharge threshold range is set to a first set multiple of the suitable operating current of the energy storage battery;

[0030] The maximum value of the charging threshold range is set to a second set multiple of the suitable operating current of the energy storage battery;

[0031] The first setting multiple and the second setting multiple are setting values ​​greater than 1 respectively.

[0032] Optionally, the suitable operating current of the energy storage battery is set according to the battery temperature of the energy storage battery and the temperature and humidity of the working environment, and the setting process of the suitable operating current of the energy storage battery is configured as follows:

[0033] Detecting the battery temperature, and searching for the corresponding recommended operating current from a preset battery operating curve according to the battery temperature, wherein the battery operating curve is provided with a corresponding relationship between the battery temperature and the recommended operating current;

[0034] Detect the temperature and humidity of the working environment, and predict the temperature rise rate of the energy storage battery during charging and discharging based on the temperature and humidity of the working environment;

[0035] The recommended operating current is corrected according to the temperature rise rate to obtain the appropriate operating current.

[0036] Optionally, the electric energy conversion device is further configured to:

[0037] Obtain historical data of current on household lines;

[0038] Analyze the historical data of current and predict the usage of energy storage batteries in the next operation cycle;

[0039] Charge and discharge the energy storage battery in advance according to usage.

[0040] Optionally, the process of the electric energy conversion device charging and discharging the energy storage battery in advance according to the usage includes:

[0041] When the discharge energy of the energy storage battery is greater than the charging energy, the energy storage battery is charged in advance;

[0042] When the discharge energy of the energy storage battery is less than the charge energy, the energy storage battery is discharged in advance.

[0043] Optionally, the process of the electric energy conversion device charging the energy storage battery in advance is configured as follows: selecting a period of low electricity price or a period of low electricity load for charging;

[0044] The process of the electric energy conversion device discharging the energy storage battery in advance is configured as follows: discharging is performed during peak electricity price periods or periods with heavy electricity load.

[0045] According to another aspect of the present invention, a control method for a household photovoltaic energy storage management system is also provided. The household photovoltaic energy storage management system is any one of the household photovoltaic energy storage management systems mentioned above, and the control method includes: obtaining the current direction and / or magnitude collected by the wireless current sensor; controlling the electric energy conversion device to convert the electric energy between the solar photovoltaic panels, the energy storage batteries, and the power grid according to the current direction and / or magnitude.

[0046] The household photovoltaic energy storage management system of the present invention sets a wireless current sensor on the household's incoming line, and uses the wireless current sensor to collect the current direction and / or size on the household's incoming line, so as to determine the power utilization of the household photovoltaic energy storage management system, solving the problem of being unable to obtain real-time and effective data from the power grid. The power conversion device is connected to the wireless current sensor signal through wireless transmission, and is configured to convert the power between the solar photovoltaic panels, energy storage batteries, and the power grid in a controlled manner according to the current direction and / or size. The power conversion device can timely adjust the working status of the solar photovoltaic panels and energy storage batteries, improve the efficiency and economic benefits of power utilization, and reduce the power fluctuation of the power grid.

[0047] Furthermore, the household photovoltaic energy storage management system of the present invention uses a snap-on wireless current transformer, which is easy to install. The power conversion device and the wireless current sensor are connected through any of the following communication methods: LoRa, Bluetooth, Zigbee, Sigfox, avoiding the laying of communication cables between the power conversion device and the wireless current sensor, saving costs.

[0048] Furthermore, the household photovoltaic energy storage management system of the present invention optimizes the control strategy of the electric energy conversion equipment, thereby ensuring the long-term stable operation of the battery and saving maintenance and replacement costs.

[0049] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0051] Figure 1 is a schematic diagram of component connections of a household photovoltaic energy storage management system according to an embodiment of the present invention;

[0052] Figure 2 is a schematic diagram of component connections of a household photovoltaic energy storage management system according to another embodiment of the present invention;

[0053] Figure 3 is a schematic diagram of an electric energy conversion device in a household photovoltaic energy storage management system according to an embodiment of the present invention; and

[0054] Figure 4 Schematic diagram of a control method of a household photovoltaic energy storage management system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The embodiment of the present invention provides a household photovoltaic energy storage management system, which can adjust the operating status of solar photovoltaic panels and energy storage batteries according to the electricity consumption in the household.

[0056] Figure 1 1 is a schematic diagram of the connection of components of a household photovoltaic energy storage management system according to an embodiment of the present invention. The household photovoltaic energy storage management system generally includes a solar photovoltaic panel 170, an energy storage battery 180, a wireless current sensor 110, and an electric energy conversion device 160.

[0057] Among the above components, the solar photovoltaic panel 170 is used to be arranged in the illuminated area of ​​the home and generate electricity using the illumination. The solar photovoltaic panel 170 can generally be arranged in the balcony area, fixed by hanging or the like, and convert electricity using sunlight.

[0058] The energy storage battery 180 is used to store and release electrical energy. The energy storage battery 180 can be selected from lithium-ion batteries, lead-acid batteries, sodium-sulfur batteries, nickel-metal hydride batteries, zinc-based batteries, supercapacitors, etc. It is required to have the following: (1) a complete protection mechanism, including overcharge, over-discharge, over-temperature protection, etc., to ensure the safe operation of the battery under various working conditions and avoid safety hazards such as fire and explosion; (2) a long cycle life, that is, it can be charged and discharged multiple times within a certain period without seriously affecting the battery capacity. After a large number of cycles, the battery capacity can still be maintained at a certain ratio; (3) It has a wide operating temperature range and can work normally in a wide temperature range such as -10°C to +45°C. Through the above conditions, the energy storage battery 180 can meet the requirements of home use.

[0059] The wireless current sensor 110 can be arranged on the household line 120 of the power grid 200, and is used to collect the current direction and / or magnitude on the household line 120. The wireless current sensor 110 can be used as a snap-on wireless current transformer, and the household line 120 is passed through the threading hole of the snap-on wireless current transformer. The snap-on wireless current transformer adopts a convenient snap-on design, which can be easily and quickly installed on the household line 120 for current measurement without disconnecting the line. Compared with traditional current transformers, the snap-on wireless current transformer can convert the detected current signal into a radio signal, which is transmitted to a receiving device (such as an electric energy conversion device) through wireless communication technology (such as LoRa, Bluetooth, Zigbee, Sigfoxe, etc.), realizing remote monitoring and data collection.

[0060] The wireless current sensor 110 can determine the direction of flow of electric energy based on the direction of the current. For example, if the current on the household line 120 flows toward the grid side 200, it can be determined that the power generation power of the solar photovoltaic panel 170 is greater than the power of household electrical equipment at this time, and economic benefits are obtained by transmitting electricity to the grid 200; and if the current on the household line 120 flows toward the distribution box 130 (indoor direction), it can be determined that the power generation power of the solar photovoltaic panel 170 is less than the power of household electrical equipment at this time, and the grid 200 supplies power to the household.

[0061] The collected data of the wireless current sensor 110 may have a bidirectional specified threshold over-limit duration window management mechanism, and the control instruction is triggered only when the over-limit exceeds the time window, so as to avoid frequent start and stop control of the equipment.

[0062] The power conversion device 160 is connected to the wireless current sensor 110 signal by wireless transmission, and is configured to convert the power between the solar photovoltaic panel 170, the energy storage battery 180, and the external power grid 200 in a controlled manner according to the current direction and / or magnitude. The power conversion device 160 can use a micro inverter, which is used to convert the direct current (DC) of the solar photovoltaic panel 170 and the energy storage battery 180 into alternating current (AC), and convert the alternating current (AC) provided by the power grid 200 into direct current (DC) for charging the energy storage battery 180. The power conversion device 160 can use a dedicated household socket 150 to connect to the household internal power distribution network.

[0063] The power conversion device 160 is connected to the wireless current sensor 110 via any of the following communication methods: LoRa, Bluetooth, Zigbee, Sigfox. This type of communication method has a moderate communication distance and can ensure that data is transmitted from the vicinity of the distribution box 130 to the location of the power conversion device 160 on the balcony. It has low power consumption, low cost, and high information security.

[0064] The electric energy conversion device 160 can use the current data to apply energy scheduling and control technology, comprehensively evaluate photovoltaic power generation, energy storage, and load power consumption data, and perform energy optimization scheduling. For example, if there is surplus photovoltaic power generation at noon, the energy storage battery 180 can be dispatched to store electricity. If the energy storage battery 180 is also fully charged, the heat pump, water heater and other loads can be dispatched to start for heat storage management, thereby promoting the consumption of electric energy and reducing the user's electricity cost. In addition, the electric energy conversion device 160 can also use the current data to grasp the power grid connection status in real time, regulate the power generation power, energy storage charging and discharging, and load startup, and prevent the current from being reversed to the power grid 200 and having an adverse effect on the power grid.

[0065] The process of the electric energy conversion device 160 controlling the energy storage battery 180 to charge and discharge can be: determining the direction of electric energy transmission on the household line 120 as receiving or supplying power according to the direction of the current; and determining the receiving current value or the supplying current value according to the current size; when the receiving current value is within the set discharge threshold range, controlling the stored electric energy of the energy storage battery 180 to be released outward; when the supply current value is within the set charging threshold range, controlling the charging of the energy storage battery 180 to store electric energy.

[0066] The receiving current value or the supply current value reflects the relationship between the electric energy generated by the household photovoltaic energy storage management system and the power load. The larger the receiving current value, the greater the difference between the load power of the household electrical equipment and the power generation power of the solar photovoltaic panel 170, and more grid power is needed; and the larger the supply current value, the greater the difference between the power generation power of the solar photovoltaic panel 170 and the load power of the household electrical equipment, and more power is provided to the grid 200.

[0067] Since the energy storage battery 180 is limited by the home environment, its own capacity and charging and discharging power are limited, and the needs of home users are more to be disturbed as little as possible, and the fewer the maintenance and update times, the better. Therefore, in this embodiment, the power conversion device 160 is configured to control the storage battery 180 to release the stored energy when the receiving current value is within the set discharge threshold range; and to control the charging of the energy storage battery 180 to store energy when the supply current value is within the set charging threshold range. By limiting the discharge threshold range and the charging threshold range, the following advantages can be achieved: (1) Extending the battery life: Limiting the discharge current can prevent the internal heat of the battery from being too high. Excessive discharge current will cause the internal temperature of the battery to rise sharply, accelerate the chemical reaction rate, and increase the probability of side reactions, thereby affecting the cycle life of the battery. Reasonable discharge current can keep the internal reaction of the battery mild and extend the overall service life of the battery. (2) Improving safety: Limiting the charging current can prevent the battery from overheating or overcharging. Too fast a charging speed may cause excessive gas generation inside the battery, increase the internal pressure of the battery, and in severe cases may cause the battery to swell. Reasonable limiting of the charging current can effectively reduce this risk. (3) Optimizing battery performance: Controlling the appropriate charging and discharging current helps maintain the battery in the best working state and achieve maximum energy efficiency and power output. Too fast a charging or discharging rate may cause the battery to not fully react, thereby reducing the actual available energy of the battery. (4) Maintaining battery consistency: In the energy storage battery 180 composed of multiple batteries connected in series or in parallel, controlling the current can maintain voltage balance between batteries, avoid performance degradation of a single battery due to overcharging or over-discharging, and maintain the stability of the performance of the entire energy storage system.

[0068] Before controlling the energy storage battery 180 to release the stored electric energy outward or controlling the energy storage battery 180 to charge to store electric energy, the electric energy conversion device 160 can also be configured to predict the lighting status of the solar photovoltaic panel 170 and the household power load during the energy storage battery 180 releasing electric energy outward or charging; determine whether the fluctuations in electric energy supply and demand caused by the lighting status and the household power load are respectively less than the set change rate; if so, control the energy storage battery 180 to release the stored electric energy outward or control the energy storage battery 180 to charge to store electric energy.

[0069] The better the lighting conditions, the greater the power output by the solar photovoltaic panel 170; conversely, the smaller the power output by the solar photovoltaic panel 170, if the energy storage battery 180 releases electrical energy to the outside or during charging, the power output by the solar photovoltaic panel 170 or the power of the household electrical load changes too much, it will cause the charging and discharging power of the energy storage battery 180 to increase accordingly, which will have an impact on the energy storage battery 180.

[0070] The illumination state of the solar photovoltaic panel 170 can be determined according to the time period and seasonal information during which the battery 180 releases electrical energy or charges. The power conversion device 160 can pre-configure or query the time of sunrise and sunset, and determine the power generation power in each time period. In some embodiments, the illumination state can also be combined with the weather forecast to take into account weather factors such as cloud thickness and rainfall. In addition, the household photovoltaic energy storage management system of this embodiment can also establish a prediction model to predict future illumination states based on the collected data and meteorological factors. These models can be based on statistics or machine learning, depending on the availability and accuracy of the data.

[0071] The prediction of household electricity load involves comprehensive consideration of multiple factors, which can be predicted by the following methods: time series prediction, machine learning prediction, etc. For example, the time series prediction method uses historical electricity data to find the rules in its time series, and uses time series models (such as ARIMA models) for prediction. Another example is machine learning prediction, which continuously adjusts the weights between the nodes in the neural network through learning, trains historical electricity data, and predicts the peak and trough of electricity load in the future.

[0072] When the fluctuation of power supply and demand caused by the lighting state and household power load is less than the set change rate, the power conversion device 160 controls the energy storage battery 180 to release the stored power or controls the charging of the energy storage battery to store power, which can ensure that the energy storage battery 180 is not subjected to severe load shock. The above-mentioned set change rate can be set according to the situation, for example, if the change exceeds 20% or 25% of the initial value, it is determined that the energy storage battery is not suitable for the initially determined charging and discharging method.

[0073] When the fluctuations in lighting conditions and power load are greater than the set change rate, the power conversion device 160 is also configured to issue status adjustment instructions to the electrical equipment in the home according to the fluctuations in lighting conditions and power load, so as to reduce the fluctuations in power supply and demand caused by the lighting conditions and power load.

[0074] Figure 2 It is a schematic diagram of the connection of components of a household photovoltaic energy storage management system according to another embodiment of the present invention. In this embodiment, the power conversion device 160 is also connected to the household electrical equipment 190 (high-power electrical equipment, such as water heaters, air conditioners, heaters and other heat storage equipment) in communication, and can issue state adjustment instructions to the household electrical equipment 190. The power conversion device 160 and the electrical equipment 190 can be connected to each other wirelessly or wiredly. In some embodiments, the power conversion device 160 can be connected to the control center of the electrical equipment, and the control center adjusts the state of the electrical equipment 190.

[0075] For example, when the power generation of the solar photovoltaic panel 170 increases by more than the set change rate or the power consumption of the electrical equipment 190 decreases by more than the set change rate, the electrical equipment 190 in the home can be operated at a lower power or even shut down; when the power generation of the solar photovoltaic panel 170 decreases by more than the set change rate or the power consumption of the electrical equipment 190 increases by more than the set change rate, the electrical equipment 190 in the home can be operated at a higher power or unturned appliances can be turned on.

[0076] That is, when the lighting conditions deteriorate, causing the power generation of the solar photovoltaic panel 170 to decrease or the power load to increase, the power conversion device 160 sends an adjustment instruction to shut down and / or reduce the operating power to the electrical equipment 190 in the home; and when the lighting conditions improve, causing the power generation of the solar photovoltaic panel 170 to increase or the power load to decrease, the power conversion device 160 sends an adjustment instruction to start up and / or increase the operating power to the electrical equipment 190 in the home.

[0077] The above-mentioned discharge threshold range and charge threshold range are respectively set according to the suitable working current of the energy storage battery 180. The above-mentioned suitable working current refers to the recommended charging and discharging current of the energy storage battery 180 that can reliably ensure the health of the battery.

[0078] The maximum value of the discharge threshold range is set to a first set multiple of the suitable operating current of the energy storage battery 180; the maximum value of the charging threshold range is set to a second set multiple of the suitable operating current of the energy storage battery 180; the first set multiple and the second set multiple are respectively set values ​​greater than 1, for example, the value range of the first set multiple can be set to 1.1 to 1.3 times, and by limiting the maximum value of the discharge threshold range, it is possible to avoid rapid discharge of the battery and cause battery capacity decay; for example, the value is 1.2, and the second set multiple can be set to 1.05 to 1.2 times, for example, the value is 1.1, and by limiting the maximum value of the charging threshold range, it is possible to avoid rapid charging of the battery and cause accelerated aging of the battery.

[0079] The suitable operating current of the energy storage battery 180 is set according to the battery temperature of the energy storage battery 180 and the temperature and humidity of the working environment, and the setting process of the suitable operating current of the energy storage battery 180 can be configured as follows: detecting the battery temperature, and finding the corresponding recommended operating current from the preset battery working curve according to the battery temperature, and the battery working curve is provided with a corresponding relationship between the battery temperature and the recommended operating current; detecting the temperature and humidity of the working environment, and predicting the temperature rise rate of the energy storage battery 180 for charging and discharging according to the temperature and humidity of the working environment; correcting the recommended operating current according to the temperature rise rate to obtain the suitable operating current. By correcting the temperature rise rate, the suitable operating current can be made more consistent with the operating conditions of the battery, further improving the reliability of the battery operation. The battery working curve can be obtained in advance through the test summary of the battery.

[0080] The electric energy conversion device 160 can also be configured to obtain historical data of the current on the household line 120; analyze the historical data of the current to predict the usage of the energy storage battery 180 in the next operation cycle; and perform charging and discharging operations on the energy storage battery 180 in advance according to the usage. Among them, the process of the electric energy conversion device 160 performing charging and discharging operations on the energy storage battery 180 in advance according to the usage may include: charging the energy storage battery 180 in advance when the usage is that the discharge energy of the energy storage battery 180 is greater than the charging energy; discharging the energy storage battery 180 in advance when the usage is that the discharge energy of the energy storage battery 180 is less than the charging energy. The operation cycle of the energy storage battery 180 can be measured in days, for example, the usage of the energy storage battery 180 in the next operation cycle can be predicted at a fixed time every day, and the above fixed time can be selected at a time during the off-peak electricity price period, so as to charge during the off-peak electricity price period.

[0081] The process of the electric energy conversion device 160 charging the energy storage battery 180 in advance is configured as follows: charging is performed during off-peak electricity price periods or periods with low electricity load; the process of the electric energy conversion device 160 discharging the energy storage battery 180 in advance is configured as follows: discharging is performed during peak electricity price periods or periods with high electricity load. Through this step, the economic benefits of the household photovoltaic energy storage management system can be improved.

[0082] Figure 31 is a schematic diagram of an electric energy conversion device 160 in a household photovoltaic energy storage management system according to an embodiment of the present invention. The electric energy conversion device 160 includes: a controller 161, a communication interface 162, a micro inverter 163, and an electrical plug 164. The controller 161 is used as a control core to process various types of collected data and issue corresponding control instructions. The controller 161 may include a processor suitable for executing stored instructions and a memory that provides temporary storage space for the operation of the instructions during operation. The processor may be a single-core processor, a multi-core processor, a computing cluster, or any other number of configurations. The storage may include a random access memory (RAM), a read-only memory, a flash memory, or any other suitable storage system. The communication interface 162 is used to interact with components such as wireless current sensors and collect corresponding data. The micro inverter 163 is controlled by the controller 161 as a power conversion device to complete the conversion between AC and DC. The electrical plug 164 is used to connect to the socket to achieve electrical connection.

[0083] This embodiment also provides a control method for a household photovoltaic energy storage management system, where the household photovoltaic energy storage management system is any one of the household photovoltaic energy storage management systems described above. Figure 4 is a schematic diagram of a control method of a household photovoltaic energy storage management system according to an embodiment of the present invention. The control method of the household photovoltaic energy storage management system may generally include:

[0084] Step S401, obtaining the current direction and / or magnitude collected by the wireless current sensor 110;

[0085] Step S402, controlling the electric energy conversion device to convert electric energy between the solar photovoltaic panel 170, the energy storage battery 180, and the power grid 200 according to the direction and / or magnitude of the current.

[0086] The control method of the household photovoltaic energy storage management system of this embodiment can timely adjust the working status of the solar photovoltaic panel 170 and the energy storage battery 180, improve the efficiency and economic benefits of electric energy use, and reduce the power fluctuation of the power grid.

[0087] Furthermore, the household photovoltaic energy storage management system of this embodiment uses a snap-on wireless current transformer, which is easy to install. The power conversion device 160 and the wireless current sensor 110 are connected through any of the following communication methods: LoRa, Bluetooth, Zigbee, Sigfox, avoiding the layout of communication cables between the power conversion device 160 and the wireless current sensor 110, saving costs. This solution integrates and improves transformer measurement technology, wireless transmission technology, and intelligent scheduling technology. In the "small" scene of balcony photovoltaic energy storage, a new energy application, it not only meets the requirements of C-end products such as simple installation and plug-and-play, but also realizes the advanced application of professional new energy microgrids.

[0088] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A household photovoltaic energy storage management system, comprising: Solar photovoltaic panels are used to be arranged in sunny areas and use sunlight to generate electricity; Energy storage batteries, used to store and release electrical energy; A wireless current sensor is arranged on the household line of the power grid and is used to collect the direction and / or magnitude of the current on the household line; An electric energy conversion device is connected to the wireless current sensor signal by wireless transmission, and is configured to convert the electric energy between the solar photovoltaic panel, the energy storage battery, and the power grid in a controlled manner according to the direction and / or magnitude of the current, and The electric energy conversion device is further configured to: determine the direction of electric energy transmission on the household line as receiving or supplying power according to the current direction; and determine the receiving current value or the supply current value according to the current magnitude; When the power receiving current value is within the set discharge threshold range, the stored electric energy of the energy storage battery is controlled to be released outward; when the power supply current value is within the set charging threshold range, the energy storage battery is controlled to be charged to store electric energy, wherein the power receiving refers to the household photovoltaic energy storage management system obtaining electric energy from the power grid, and the power supply refers to the household photovoltaic energy storage management system providing electric energy to the power grid; as well as Before controlling the energy storage battery to release the stored electric energy outward or controlling the energy storage battery to be charged to store electric energy, the method also includes: predicting the lighting state of the solar photovoltaic panel and the household electricity load during the period when the energy storage battery releases electric energy outward or is charged; judging whether the fluctuations in the supply and demand of electric energy caused by the lighting state and the household electricity load are respectively less than the set change rate; if so, executing the step of controlling the energy storage battery to release the stored electric energy outward or controlling the energy storage battery to be charged to store electric energy.

2. The household photovoltaic energy storage management system according to claim 1, wherein The wireless current sensor is a snap-on wireless current transformer, and the household line is passed through a threading hole of the snap-on wireless current transformer; and The electric energy conversion device is connected to the wireless current sensor via any one of the following communication methods: LoRa, Bluetooth, Zigbee, Sigfox.

3. The household photovoltaic energy storage management system according to claim 1, wherein when the fluctuation of the illumination state and the power load is greater than the set change rate, the power conversion device is further configured to: According to the illumination state and the fluctuation of the power load, a state adjustment instruction is issued to the electrical equipment in the home to reduce the fluctuation of the supply and demand of electric energy caused by the illumination state and the power load.

4. The household photovoltaic energy storage management system according to claim 3, wherein the electric energy conversion device is further configured to: When the illumination condition deteriorates, causing the power generation of the solar photovoltaic panel to decrease or the power load to increase, issuing an adjustment instruction to shut down and / or reduce the operating power of the electrical equipment in the home; When the illumination condition becomes better and the power generation power of the solar photovoltaic panel increases or the power load decreases, an adjustment instruction to start up and / or increase the operating power is sent to the electrical equipment in the home.

5. The household photovoltaic energy storage management system according to claim 1, wherein The discharge threshold range and the charge threshold range are respectively set according to the suitable operating current of the energy storage battery, wherein The maximum value of the discharge threshold range is set to a first set multiple of the suitable operating current of the energy storage battery; The maximum value of the charging threshold range is set to a second set multiple of the suitable operating current of the energy storage battery; The first setting multiple and the second setting multiple are setting values ​​greater than 1 respectively.

6. The household photovoltaic energy storage management system according to claim 5, wherein The suitable operating current of the energy storage battery is set according to the battery temperature of the energy storage battery and the temperature and humidity of the working environment, and the setting process of the suitable operating current of the energy storage battery is configured as follows: Detecting the battery temperature, and searching for a corresponding recommended operating current from a preset battery operating curve according to the battery temperature, wherein the battery operating curve is provided with a corresponding relationship between the battery temperature and the recommended operating current; Detecting the temperature and humidity of the working environment, and predicting the temperature rise rate of the energy storage battery during charging and discharging according to the temperature and humidity of the working environment; The recommended operating current is corrected according to the temperature rise rate to obtain the suitable operating current.

7. The household photovoltaic energy storage management system according to claim 1, wherein the electric energy conversion device is further configured to: Obtaining historical data of current on the household line; Analyze the historical data of the current to predict the usage of the energy storage battery in the next operation cycle; The energy storage battery is charged and discharged in advance according to the usage conditions.

8. The household photovoltaic energy storage management system according to claim 7, wherein the process in which the electric energy conversion device performs charging and discharging operations on the energy storage battery in advance according to the usage conditions comprises: In the usage condition that the discharge energy of the energy storage battery is greater than the charge energy, charging the energy storage battery in advance; When the usage condition is that the discharge energy of the energy storage battery is less than the charge energy, the energy storage battery is discharged in advance.

9. The household photovoltaic energy storage management system according to claim 8, wherein The process of the electric energy conversion device charging the energy storage battery in advance is configured as follows: selecting a low-peak electricity price period or a period with low electricity load for charging; The process of the electric energy conversion device discharging the energy storage battery in advance is configured as follows: discharging is performed during a peak electricity price period or a period with a large electricity load.

10. A control method for a household photovoltaic energy storage management system, wherein the household photovoltaic energy storage management system is a household photovoltaic energy storage management system according to any one of claims 1 to 9, and the control method comprises: Acquiring the direction and / or magnitude of the current collected by the wireless current sensor; The electric energy conversion device is controlled according to the current direction and / or magnitude to convert electric energy between solar photovoltaic panels, energy storage batteries, and power grids.

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