A household optical energy storage and heat system, its control method and control device

Abstract

The present invention belongs to the field of photovoltaic technology, and particularly relates to a household photovoltaic-thermal storage system, its control method and control device, including: a photovoltaic module; an electric water heater electrically connected to the photovoltaic module through an inverter; a storage battery electrically connected to the photovoltaic module and the electric water heater; an electric energy meter for detecting the output voltage and output current of the photovoltaic module; a control module electrically connected to the electric energy meter and the electric water heater, and the control module is configured to be able to calculate the output power of the photovoltaic module according to the output voltage and output current of the photovoltaic module, and control the heating power of the electric water heater according to the output power of the photovoltaic module. This system uses a photovoltaic module to replace the solar thermal collector, configures a storage battery, and uses an off-grid and on-grid integrated inverter. In addition to providing electricity for residents, it uses photovoltaic power to meet the hot water needs of residents and stores the excess photovoltaic power in the battery to improve the self-use rate of photovoltaic power generation.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaics, and in particular relates to a household solar thermal storage system and a control method and a control device thereof. Background Art

[0002] Solar energy has the characteristics of intermittent radiation. It cannot be continuously output due to the influence of cloudy and sunny weather. On rainy days, the radiation is insufficient, and the solar thermal system needs to be supplemented by electric heating; on sunny days, the radiation is high, and the solar thermal system cannot be fully used, resulting in abandoned light. On days with good radiation, the photovoltaic system can still transmit electricity to the grid after meeting the demand for hot water. The nominal solar energy conversion efficiency of the photovoltaic system is about 20%, and that of the solar thermal system is 50%. Although the nominal efficiency difference is obvious, the carbon reduction effect of the solar thermal system is lower than that of the photovoltaic system because the solar thermal system has serious abandoned light and its service life is only 1 / 3 of that of the photovoltaic system. The solar thermal system has a single type of energy supply and can only produce hot water. However, the demand for hot water by residents is limited, and even if the capacity is forcibly expanded, it cannot be absorbed, resulting in abandoned light. The photovoltaic system generates electricity and is connected to the grid for use by the whole society, reducing fossil energy power generation. The solar thermal system is often arranged on the balcony, while the building photovoltaic has a large layout and technical optimization space. In addition to the balcony, we can also use the facade, roof, etc. of the building. The photovoltaic system still has the potential to arrange a large number of components to increase the system capacity. For real estate developers, they are more concerned about cost. Under the same area conditions, the initial cost of photovoltaics is slightly lower than that of solar thermal.

[0003] However, the defects of the photovoltaic system are that photovoltaic power generation is intermittent, with the highest output during the day, high power generation at noon, low power generation in the morning and evening, and no power generation at night. Most residential buildings only have short-term loads at noon, and the power load is mostly at night. Therefore, there is a time misalignment between the photovoltaic system and residential electricity consumption, which reduces the self-generation and self-use rate of photovoltaic power generation. In addition, the recommended ambient temperature for lithium batteries is 25℃, and its performance is significantly affected outside the range of 1-35℃. Charging lithium batteries at low temperatures will not only cause the battery capacity to decay rapidly, but also cause serious safety hazards. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a household solar thermal storage system and a control method and control device thereof that can improve the self-generation and self-use rate of photovoltaic power generation.

[0005] In order to achieve the above-mentioned object and other related objects, the present invention provides a household solar thermal storage system, comprising:

[0006] Photovoltaic panels;

[0007] An electric water heater, electrically connected to the photovoltaic module via an inverter;

[0008] An energy storage battery, electrically connected to the photovoltaic module and the electric water heater;

[0009] A control module, electrically connected to the electric water heater, is configured to control the heating power of the electric water heater according to the output power of the photovoltaic module.

[0010] In an optional embodiment of the present invention, it further includes a gas water heater. The water circuit of the gas water heater is connected in series with the water circuit of the electric water heater. The gas water heater is electrically connected to the control module. The control module is configured to be able to control the electric water heater to work alone or the electric water heater and the gas water heater to work simultaneously according to the water usage demand and the heating power of the electric water heater.

[0011] In an optional embodiment of the present invention, a hot water coil and a temperature sensor are provided beside the energy storage battery. The hot water coil is communicated with the water circuit of the electric water heater. A stop valve is provided between the hot water coil and the electric water heater. The temperature sensor and the stop valve are electrically connected to the control module. The control module is configured to be able to control the opening or closing of the stop valve according to the detection signal of the temperature sensor.

[0012] To achieve the above and other related purposes, the present invention also provides a control method for the household photovoltaic energy storage and heat system, including the following steps:

[0013] Obtain the real-time power generation power of the photovoltaic module;

[0014] When the real-time power generation power is less than the maximum rated power of the electric water heater, control the heating power of the electric water heater to be consistent with the real-time power generation power;

[0015] When the real-time power generation power is greater than the maximum rated power of the electric water heater, control the electric water heater to operate at the maximum rated power, and control the energy storage battery to store the excess power output by the photovoltaic module.

[0016] In an optional embodiment of the present invention, it further includes the following steps:

[0017] Obtain the water consumption and the water temperature demand;

[0018] Obtain the real-time power generation power of the photovoltaic module within a period of time;

[0019] Predict the power generation within a future period of time according to the real-time power generation power within the period of time;

[0020] Compare the power generation within the future period of time with the water consumption and the water temperature demand;

[0021] When the power generation within the future period of time can meet the water consumption and the water temperature demand, control the electric water heater to operate alone;

[0022] When the generated electricity within a future period of time cannot meet the water consumption and water temperature requirements, control the electric water heater and the gas water heater to operate simultaneously.

[0023] In an alternative embodiment of the present invention, after the step of controlling the electric water heater to operate alone when the generated electricity within a future period of time can meet the water consumption and water temperature requirements, the following steps are further included:

[0024] When the user uses water, if the water temperature does not reach the water temperature requirement, turn on the gas water heater until the water temperature reaches the water temperature requirement, and then turn off the gas water heater.

[0025] In an alternative embodiment of the present invention, the step of predicting the generated electricity within a future period of time according to the real-time power generation power within a period of time includes:

[0026] Perform outlier detection and replacement on the real-time power generation power within a period of time;

[0027] Perform linear regression analysis on the real-time power generation power within a period of time after the outlier detection and replacement, and calculate the photovoltaic power at multiple moments within a future period of time according to the analysis results;

[0028] Calculate the generated electricity within a future period of time according to the photovoltaic power at multiple moments within a future period of time;

[0029] Repeat the above process every preset time period to correct the generated electricity within a future period of time.

[0030] In an alternative embodiment of the present invention, the following steps are further included:

[0031] Obtain the detection signal of the temperature sensor;

[0032] When the temperature is lower than the preset temperature, control the cut-off valve of the hot water coil to open to heat the energy storage battery;

[0033] When the temperature is higher than the preset temperature, control the cut-off valve of the hot water coil to close to stop heating the energy storage battery.

[0034] To achieve the above and other related purposes, the present invention further provides a control method for the household photovoltaic energy storage and heat system, including the following steps:

[0035] Obtain the water consumption and water temperature requirements;

[0036] Obtain the real-time power generation power of the photovoltaic module within a period of time;

[0037] Predict the generated electricity within a future period of time according to the real-time power generation power within a period of time;

[0038] Compare the generated electricity within the future period of time with the water consumption and water temperature requirements.

[0039] When the generated electricity within the future period of time can meet the water consumption and water temperature requirements, control the electric water heater to operate independently.

[0040] When the generated electricity within the future period of time cannot meet the water consumption and water temperature requirements, control the electric water heater and the gas water heater to operate simultaneously.

[0041] To achieve the above and other related purposes, the present invention also provides a control device applied to the household photovoltaic-thermal storage system, including:

[0042] A first receiving module, configured to obtain the water consumption and water temperature requirements.

[0043] A second receiving module, configured to obtain the real-time power generation power of the photovoltaic module within a period of time.

[0044] A first operation module, configured to predict the generated electricity within a future period of time according to the real-time power generation power within the period of time.

[0045] A second operation module, configured to compare the generated electricity within the future period of time with the water consumption and water temperature requirements.

[0046] A first execution module, configured to control the electric water heater to operate independently when the generated electricity within the future period of time can meet the water consumption and water temperature requirements.

[0047] A second execution module, configured to control the electric water heater and the gas water heater to operate simultaneously when the generated electricity within the future period of time cannot meet the water consumption and water temperature requirements.

[0048] The technical effect of the present invention lies in.

[0049] This system replaces the solar thermal collector with a photovoltaic module, configures an energy storage battery, and uses an off-grid and on-grid integrated inverter. In addition to providing electricity for residents, it uses photovoltaic power to meet the hot water needs of residents and stores the excess photovoltaic power in the battery to improve the self-use rate of photovoltaic power generation.

[0050] The energy storage battery can well solve the problem of the asynchrony between photovoltaic power generation and user loads. During the day, when the photovoltaic power generation in the household cannot be consumed by the load, it is stored in the battery and discharged to the household load at night, and the insufficient part is dynamically supplemented by the power grid.

[0051] The electric water heater and the gas water heater are connected in series for heating, taking into account both the heating speed and economy.

[0052] Use the hot water of the water heater to keep the energy storage battery warm under low-temperature conditions, so that its charge and discharge are not affected, improve the battery life, and reduce potential safety hazards. Brief Description of the Drawings

[0053] Figure 1 It is the schematic diagram of the household optical energy storage and heat system provided by the embodiment of the present invention;

[0054] Figure 2 It is the flowchart of the control method of the household optical energy storage and heat system provided by the embodiment of the present invention;

[0055] Figure 3 It is the flowchart of the control method of the household optical energy storage and heat system provided by another embodiment of the present invention;

[0056] Figure 4 It is the flowchart of the future power generation prediction method provided by the embodiment of the present invention;

[0057] Figure 5 It is the flowchart of the control method of the household optical energy storage and heat system provided by yet another embodiment of the present invention;

[0058] Figure 6 It is the functional module block diagram of the control device of the household optical energy storage and heat system provided by the embodiment of the present invention;

[0059] Figure 7 It is the all-day change curve diagram of the photovoltaic power provided by the embodiment of the present invention, where the abscissa in the figure is time and the ordinate is photovoltaic power;

[0060] Figure 8 It is the control flowchart of the gas water heater series heating system provided by the embodiment of the present invention. Detailed Embodiments

[0061] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0062] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0063] Embodiment 1

[0064] Figure 1 is the schematic diagram of the household optical storage heat system provided by the embodiment of the present invention. The household optical storage heat system includes a photovoltaic module 10, an electric water heater 20, an energy storage battery 30, an electricity meter 11 and a control module 60. The photovoltaic module 10 is used to convert solar energy into electric energy. The electric water heater 20 is electrically connected to the photovoltaic module 10 through an inverter 50. The energy storage battery 30 is electrically connected to the photovoltaic module 10 and the electric water heater 20. The electricity meter 11 is used to detect the output voltage and output current of the photovoltaic module 10. The control module 60 is electrically connected to the electricity meter 11 and the electric water heater 20, and the control module 60 is configured to calculate the output power of the photovoltaic module 10 according to the output voltage and output current of the photovoltaic module 10, and control the heating power of the electric water heater 20 according to the output power of the photovoltaic module 10.

[0065] In a specific embodiment, the direct current generated by the photovoltaic module 10 of the present invention is converted into 220V / 380V industrial frequency alternating current through an off-grid and grid-connected integrated inverter 50. The electricity meter 11 is used to monitor the voltage and current of the photovoltaic system to calculate the real-time power. The frequency converter in the electric water heater 20 collects the photovoltaic real-time power signal and adjusts the frequency and voltage of the current of the electric water heater 20, so that the power of the electric water heater 20 can track the change. When the photovoltaic power is greater than the maximum tracking power of the electric water heater 20, the electric water heater 20 operates at the maximum power, and the system stores the excess power.

[0066] Figure 7 Figure 7 is the curve graph of the all-day change of the photovoltaic power provided by the embodiment of the present invention. The abscissa in the figure is time, and the ordinate is the photovoltaic power. P0 in the figure represents the maximum rated power of the electric water heater 20. It can be seen from the figure that before the moment t1 and after the moment t3, the photovoltaic power is less than the maximum rated power of the electric water heater 20. At this time, the control module 60 controls the heating power of the electric water heater 20 to change following the photovoltaic power. And between the moment t1 and the moment t3, the photovoltaic power is greater than the maximum rated power of the electric water heater 20. At this time, the electric water heater 20 is controlled to work at the maximum rated power, and the excess power is stored through the energy storage battery 30.

[0067] This system uses the photovoltaic module 10 to replace the solar thermal collector, configures the energy storage battery, and uses the off-grid and grid-connected integrated inverter 50. In addition to providing residential electricity, the photovoltaic electricity is used to meet the residential hot water demand, and the excess photovoltaic electricity is stored in the battery to improve the self-use rate of photovoltaic power generation.

[0068] The energy storage battery 30 can well solve the problem of the asynchrony between photovoltaic power generation and user loads. During the day, when the photovoltaic power generation cannot be consumed by the indoor loads, it is stored in the battery and discharged to the indoor loads at night, and the insufficient part is dynamically supplemented by the power grid.

[0069] At the same time, with the further widening of the peak-valley price difference of residential electricity consumption in the future, the energy storage battery 30 can store some low-price valley electricity at night for partial load use during the day to obtain additional benefits.

[0070] Please refer to Figure 1 As shown, in a specific embodiment, it further includes a gas water heater 40. The water circuit of the gas water heater 40 is connected in series with the water circuit of the electric water heater 20. The gas water heater 40 is electrically connected to the control module 60, and the control module 60 is configured to be able to control the electric water heater 20 to work alone or the electric water heater 20 and the gas water heater 40 to work simultaneously according to the water use demand and the heating power of the electric water heater 20.

[0071] It can be understood that due to the intermittent characteristics of solar radiation, it is greatly affected by sunny or cloudy weather, and the size of the photovoltaic power directly affects the heating power of the electric water heater 20. Therefore, in order to meet the all-weather water use demand in the present invention, the electric water heater 20 and the gas water heater 40 are connected in series to form a heating system, which can take into account the user's hot water demand and the full utilization of photovoltaic power. Specifically, when the photovoltaic power is not enough to meet the water volume and water temperature requirements, the control module 60 can control the gas water heater 40 and the electric water heater 20 to work simultaneously, and the gas water heater 40 can supplement the heating power to ensure the all-weather water use demand. When the photovoltaic power can meet the water use demand, the gas water heater 40 does not work to reduce the system energy consumption.

[0072] Please refer to Figure 1 As shown, in a specific embodiment, a hot water coil 31 and a temperature sensor 32 are provided beside the energy storage battery 30. The hot water coil 31 is communicated with the water circuit of the electric water heater 20. A stop valve 70 is provided between the hot water coil 31 and the electric water heater 20. The temperature sensor 32 and the stop valve 70 are electrically connected to the control module 60, and the control module 60 is configured to be able to control the opening or closing of the stop valve 70 according to the detection signal of the temperature sensor 32.

[0073] It can be understood that the recommended ambient temperature of the lithium battery is 25°C, and its performance is significantly affected outside the range of 1 - 35°C. Charging the lithium battery at low temperature will not only cause the rapid attenuation of the battery capacity, but also cause serious safety hazards. Therefore, in the present invention, the heat of the water heater is used to maintain the working temperature of the battery under low-temperature conditions, so as to improve the charge and discharge efficiency and service life of the energy storage battery 30.

[0074] Embodiment 2

[0075] Please refer to Figure 2 As shown, based on the household optical energy storage and heat storage system described in Embodiment 1, this embodiment provides a control method, including the following steps:

[0076] S11: Obtain the detection signal of the electricity meter 11; it can be understood that the detection signal here mainly refers to the voltage and current signals, and its purpose is to calculate the power generation power of the photovoltaic module 10. Therefore, in other embodiments, for example, the power signal of the photovoltaic module 10 can also be directly obtained. When the power signal is directly obtained, the following step S12 can be omitted.

[0077] S12: Calculate the real-time power generation power of the photovoltaic module 10 according to the detection signal of the electricity meter 11.

[0078] S13: When the real-time power generation power is less than the maximum rated power of the electric water heater 20, control the heating power of the electric water heater 20 to make it consistent with the real-time power generation power.

[0079] S14: When the real-time power generation power is greater than the maximum rated power of the electric water heater 20, control the electric water heater 20 to operate at the maximum rated power, and control the energy storage battery 30 to store the excess power output by the photovoltaic module 10.

[0080] Please refer to Figure 5 As shown, in this embodiment, in order to keep the energy storage battery 30 in a good working state in a low-temperature environment, for example, the energy storage battery 30 can also be heated according to the ambient temperature. The specific method is as follows:

[0081] S31: Obtain the detection signal of the temperature sensor 32.

[0082] S32: When the temperature is lower than the preset temperature, control the cut-off valve 70 of the hot water coil 31 to open to heat the energy storage battery 30.

[0083] S33: When the temperature is higher than the preset temperature, control the cut-off valve 70 of the hot water coil 31 to close to stop heating the energy storage battery 30.

[0084] Embodiment 3

[0085] Please refer to Figure 3 、 8 As shown, based on the household optical energy storage and heat storage system described in Embodiment 1, this embodiment provides a control method, including the following steps:

[0086] S21: Obtain the water consumption and the water temperature requirement. It can be understood that the water consumption and the water temperature requirement can be obtained, for example, by inputting through the operation panel of the water heater.

[0087] S22: Obtain the real-time power generation power of the photovoltaic module 10 within a period of time; the real-time power generation power within the period of time should include the real-time power generation powers at multiple different moments within this time period, and the number of its data depends on the acquisition frequency of the power generation power.

[0088] S23: Predict the power generation amount within a future period of time according to the real-time power generation power within the period of time; the electric heater regularly acquires the photovoltaic real-time power signal P within a period of time [t0, t1] i , first perform outlier detection and processing on the data, and then perform curve regression analysis on it to judge the power curve in the next period of time. By integrating power with respect to time, the electric heater can calculate the power generation amount data within a past and future period of time, so as to infer the increased water temperature.

[0089] Please refer to Figure 4 As shown, in a specific embodiment, the step S23 specifically includes the following steps:

[0090] S231: Perform outlier detection and replacement on the real-time power generation power within the period of time, specifically as follows:

[0091] Assume that the electric heater acquires N data in total within the acquisition period [t0, t0 + Δt]. First, calculate the average value i of the photovoltaic real-time power P and the standard deviation Screen out the outlier data in the N data that differ from by more than 3 times the standard deviation, and fill it with the linear interpolation of adjacent non-outlier values.

[0092] S232: Perform linear regression analysis on the real-time power generation power within the period of time after the outlier detection and replacement, and calculate the photovoltaic powers at multiple moments within a future period of time according to the analysis results, specifically as follows:

[0093] Within the acquisition period [t0, t0 + Δt], perform linear regression based on the data already acquired by the electric heater, and establish an equation with the photovoltaic power P as the dependent variable and the true solar time t as the independent variable: P = a + b·t + e, where a represents the intercept and b represents the slope of the straight line. Thus, use the data in the previous acquisition time period [t0, t0 + Δt] to infer the photovoltaic power P in the future period of time [t0 + Δt, t0 + 2·Δt].

[0094] S233: Calculate the power generation amount within a future period of time according to the photovoltaic powers at multiple moments within the future period of time, specifically as follows:

[0095] The predicted power P in the future period [t0 + Δt, t0 + 2·Δt] has been calculated above, and its average value is obtained Then the photovoltaic power generation is If this power generation can make the water temperature of the water heater reach the expected temperature, it belongs to the working condition with better expected power generation, otherwise the expected power generation is poor.

[0096] S234: Every time a preset time period passes, repeat the above process to correct the power generation in a future period of time.

[0097] The control method of this embodiment further includes:

[0098] S24: Compare the power generation in the future period of time with the water consumption and water temperature requirements;

[0099] S25: When the power generation in the future period of time can meet the water consumption and water temperature requirements, control the electric water heater 20 to run alone;

[0100] S26: When the power generation in the future period of time cannot meet the water consumption and water temperature requirements, control the electric water heater 20 and the gas water heater 40 to run simultaneously.

[0101] S27: When the user uses water, if the water temperature does not reach the water temperature requirement, turn on the gas water heater 40 until the water temperature reaches the water temperature requirement, and then turn off the gas water heater 40.

[0102] Please refer to Figure 6 As shown, based on the above method, this embodiment further provides a control device, including a first receiving module 100, a second receiving module 200, a first operation module 300, a second operation module 400, a first execution module 500, and a second execution module 600; the first receiving module 100 is used to obtain the water consumption and water temperature requirements; the second receiving module 200 is used to obtain the real-time power generation power of the photovoltaic module 10 in a period of time; the first operation module 300 is used to predict the power generation in a future period of time according to the real-time power generation power in the period of time; the second operation module 400 is used to compare the power generation in the future period of time with the water consumption and water temperature requirements; the first execution module 500 is used to control the electric water heater 20 to run alone when the power generation in the future period of time can meet the water consumption and water temperature requirements; the second execution module 600 is used to control the electric water heater 20 and the gas water heater 40 to run simultaneously when the power generation in the future period of time cannot meet the water consumption and water temperature requirements.

[0103] It should be noted that the control device and the control method provided in this embodiment belong to the same concept. The specific ways in which each module and unit perform operations have been described in detail in the method embodiment, and will not be elaborated here. In practical applications, the control device provided in the above embodiment can, according to needs, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above. This is not limited here either.

[0104] In summary, this system uses a photovoltaic module 10 to replace a solar thermal collector, configures a storage battery 30, and uses a grid-connected and off-grid integrated inverter 50. In addition to providing electricity for residents, it uses photovoltaic power to meet the hot water needs of residents and stores the excess photovoltaic power in the battery to increase the self-use rate of photovoltaic power generation. The storage battery 30 can well solve the problem of the asynchrony between photovoltaic power generation and user loads. During the day, when the photovoltaic power generation in the household cannot be consumed by the load, it is stored in the battery and discharged to the household load at night. The insufficient part is dynamically supplemented by the power grid. The electric water heater 20 and the gas water heater 40 are connected in series for heating, taking into account both the heating speed and economy. The hot water of the water heater is used to keep the storage battery 30 warm under low-temperature conditions, so that its charge and discharge are not affected, improving the battery life and reducing potential safety hazards.

[0105] The above embodiments merely illustrate the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

[0106] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that the embodiments of the present invention can be practiced without one or more of the specific details or by other devices, systems, components, methods, parts, materials, parts, etc. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0107] Reference throughout this specification to "one embodiment", "an embodiment", or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention and not necessarily in all embodiments. Thus, the appearances of the phrases "in one embodiment", "in an embodiment", or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the invention described and shown herein may be made in accordance with the teachings herein and will be considered part of the spirit and scope of the present invention.

[0108] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separated or more integrated manner, or even removed in some cases where they are inoperable or provided because they may be useful in a particular application.

[0109] In addition, unless otherwise explicitly specified, any marked arrows in the figures should be considered merely exemplary and not limiting. Further, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or". Where the term is anticipated to be unclear due to the ability to provide separation or combination, the combination of components or steps will also be considered to be specified.

[0110] As used in the description herein and throughout the claims below, unless otherwise indicated, the singular forms "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims below, unless otherwise indicated, the meaning of "in" includes "in" and "on".

[0111] The above description of the embodiments shown of the present invention (including what is described in the abstract of the specification) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of the invention and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications will be within the spirit and scope of the present invention as will be recognized and understood by those skilled in the art. As noted, these modifications can be made to the present invention in accordance with the above description of the embodiments of the invention described herein, and these modifications will be within the spirit and scope of the present invention.

[0112] The present disclosure has generally described systems and methods to assist in understanding the details of the present invention. In addition, various specific details have been given to provide a general understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or with other devices, systems, components, methods, assemblies, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0113] Accordingly, while the present invention has been described herein with reference to its specific embodiments, modifications, various changes and substitutions are also within the above disclosure, and it should be understood that in some instances, some features of the present invention will be employed without corresponding use of other features without departing from the scope and spirit of the claimed invention. Thus, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms and / or specific embodiments disclosed as the best mode contemplated for carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the present invention will be determined only by the appended claims.

Claims

1. A household optical storage and heat system, characterized in that Comprising: Photovoltaic modules; An electric water heater electrically connected to the photovoltaic modules through an inverter; A storage battery electrically connected to the photovoltaic modules and the electric water heater; A control module electrically connected to the electric water heater, the control module being configured to be able to control the heating power of the electric water heater according to the output power of the photovoltaic modules; Further comprising a gas water heater, the water circuit of the gas water heater being connected in series with the water circuit of the electric water heater, the gas water heater being electrically connected to the control module, the control module being configured to be able to control the electric water heater to operate alone or the electric water heater and the gas water heater to operate simultaneously according to the water use demand and the heating power of the electric water heater.

2. The household optical storage and heat system according to claim 1, wherein A hot water coil and a temperature sensor are provided beside the storage battery, the hot water coil is communicated with the water circuit of the electric water heater, a stop valve is provided between the hot water coil and the electric water heater, the temperature sensor and the stop valve are electrically connected to the control module, and the control module is configured to be able to control the opening or closing of the stop valve according to the detection signal of the temperature sensor.

3. A control method for the household optical storage and heat system according to any one of claims 1 to 2, characterized in that, Including the following steps: Obtaining the real-time power generation power of the photovoltaic modules; When the real-time power generation power is less than the maximum rated power of the electric water heater, controlling the heating power of the electric water heater to be consistent with the real-time power generation power; When the real-time power generation power is greater than the maximum rated power of the electric water heater, controlling the electric water heater to operate at the maximum rated power and controlling the storage battery to store the excess power output by the photovoltaic modules.

4. The control method according to claim 3, wherein Further including the following steps: Obtaining the water consumption and the water temperature demand; Obtaining the real-time power generation power of the photovoltaic modules within a period of time; Predicting the power generation within a future period of time according to the real-time power generation power within the period of time; Comparing the power generation within the future period of time with the water consumption and the water temperature demand; When the power generation within the future period of time can meet the water consumption and the water temperature demand, controlling the electric water heater to operate alone; When the power generation within the future period of time cannot meet the water consumption and the water temperature demand, controlling the electric water heater and the gas water heater to operate simultaneously.

5. The control method according to claim 4, wherein After the step of when the power generation within the future period of time can meet the water consumption and the water temperature demand, controlling the electric water heater to operate alone, the following steps are further included: When the user uses water, if the water temperature does not reach the water temperature demand, turning on the gas water heater until the water temperature reaches the water temperature demand and then turning off the gas water heater.

6. The control method according to claim 4, characterized in that The step of predicting the power generation within a future period of time according to the real-time power generation power within the period of time includes: Performing outlier detection and replacement on the real-time power generation power within the period of time; Performing linear regression analysis on the real-time power generation power within the period of time after the outlier detection and replacement, and calculating the photovoltaic power at multiple moments within a future period of time according to the analysis result; Calculating the power generation within a future period of time according to the photovoltaic power at multiple moments within the future period of time; Repeating the above process every preset time period to correct the power generation within a future period of time.

7. The control method according to claim 3, characterized in that It further includes the following steps: Obtain the detection signal of the temperature sensor; When the temperature is lower than the preset temperature, control the opening of the cut-off valve of the hot water coil to heat the energy storage battery; When the temperature is higher than the preset temperature, control the closing of the cut-off valve of the hot water coil to stop heating the energy storage battery.

8. The control method of the household optical storage and heat system according to claim 1, characterized in that, It includes the following steps: Obtain the water consumption and the water temperature requirement; Obtain the real-time power generation power of the photovoltaic module within a period of time; Predict the power generation amount within a future period of time according to the real-time power generation power within the period of time; Compare the power generation amount within the future period of time with the water consumption and the water temperature requirement; When the power generation amount within the future period of time can meet the water consumption and the water temperature requirement, control the electric water heater to operate independently; When the power generation amount within the future period of time cannot meet the water consumption and the water temperature requirement, control the electric water heater and the gas water heater to operate simultaneously.

9. A control device applied to the household optical storage and heat system described in claim 1, characterized in that, It includes: A first receiving module, used to obtain the water consumption and the water temperature requirement; A second receiving module, used to obtain the real-time power generation power of the photovoltaic module within a period of time; A first operation module, used to predict the power generation amount within a future period of time according to the real-time power generation power within the period of time; A second operation module, used to compare the power generation amount within the future period of time with the water consumption and the water temperature requirement; A first execution module, used to control the electric water heater to operate independently when the power generation amount within the future period of time can meet the water consumption and the water temperature requirement; A second execution module, used to control the electric water heater and the gas water heater to operate simultaneously when the power generation amount within the future period of time cannot meet the water consumption and the water temperature requirement.

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