Control method and control device of optical storage and charging system and optical storage and charging system

Abstract

The invention discloses a control method and device of an optical storage and charging system and the optical storage and charging system, and relates to the technical field of optical storage and charging. The control method comprises the steps that a voltage detection signal of the output end of the photovoltaic equipment is acquired, and the real-time output voltage of the photovoltaic equipment is determined according to the voltage detection signal; under the condition that communication connection is established between the plurality of electricity loads and the plurality of charging piles, acquiring charging voltages required by the plurality of electricity loads; subtracting the real-time output voltage of the photovoltaic equipment from the charging voltages of the plurality of electric loads to obtain a plurality of absolute voltage difference values; and according to the plurality of absolute voltage differences, controlling the switch assembly to conduct a path between the output end of the photovoltaic equipment and the charging pile, and controlling the switch assembly to conduct a path between the output end of the energy storage device and the charging pile. The invention aims to improve the energy conversion efficiency and safety of the optical storage and charging system.

Description

Technical Field

[0001] The present invention relates to the field of optical storage and charging technology, and in particular to a control method and a control device of an optical storage and charging system and an optical storage and charging system. Background Art

[0002] In the control scheme of the existing photovoltaic storage and charging system, it is usually the case that the photovoltaic device generates sufficient electricity, and the electric energy generated by the photovoltaic device is converted into voltage to supply power to the electrical load. Under the condition that the electric energy generated by the photovoltaic device is insufficient to supply power to the electrical load, it will be further supplied by the energy storage device and / or the power grid. Therefore, it can be understood that in the photovoltaic storage and charging system, the priority of the equipment supplying power to the electrical load will be photovoltaic equipment, energy storage equipment or power grid in order. Among them, the power supply priority between the energy storage device and the power grid will also be adjusted according to the fluctuation of the power grid price. However, the output voltage of the photovoltaic device is unstable, and it is necessary to set up corresponding voltage conversion equipment and voltage stabilization equipment to achieve the stability of the output voltage. However, when the output voltage of the photovoltaic device is too different from the charging voltage required by the electrical load, the voltage conversion device will have problems such as low conversion efficiency, increased heat generation and reduced device service life. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method, a control device and a photoelectric storage and charging system, aiming to improve the energy conversion efficiency and safety of the photoelectric storage and charging system.

[0004] To achieve the above-mentioned purpose, the present invention proposes a control method for a photoelectric storage and charging system, wherein the photoelectric storage and charging system comprises a photovoltaic device, an energy storage device, a control device, a switch component, a plurality of charging piles and a plurality of electrical loads with different charging voltages; the output end of the photovoltaic device is electrically connected to the input end of the energy storage device and the first end of the switch component respectively; the output end of the energy storage device is electrically connected to the second end of the switch component; the controlled end of the switch component is electrically connected to the control device, and the third end of the switch component is electrically connected to a plurality of charging piles respectively; the plurality of charging piles are electrically connected to a plurality of electrical loads with different charging voltages in a one-to-one correspondence; the control method comprises: Acquiring a voltage detection signal from an output terminal of the photovoltaic device, and determining a real-time output voltage of the photovoltaic device according to the voltage detection signal; Under the condition that a communication connection is established between the plurality of electrical loads and the plurality of charging piles, the charging voltage required by the plurality of electrical loads is obtained; Subtracting the real-time output voltage of the photovoltaic device from the charging voltages of the plurality of electrical loads to obtain a plurality of absolute voltage difference values; According to the multiple absolute voltage differences, the switch component is controlled to conduct the path between the output end of the photovoltaic device and the charging pile, and the switch component is controlled to conduct the path between the output end of the energy storage device and the charging pile.

[0005] In one embodiment, the photovoltaic storage and charging system further includes a voltage detection device and a temperature detection device, wherein the input end of the voltage detection device is electrically connected to the output end of the photovoltaic device, and the output end of the voltage detection device is electrically connected to the control device; the temperature detection device is arranged at the output end of the photovoltaic device, and the output end of the temperature detection device is electrically connected to the control device; the specific method for determining the real-time output voltage of the photovoltaic device according to the voltage detection signal includes: Determining an original voltage signal output by the voltage detection device according to the voltage detection signal; Acquire a temperature detection signal output by the temperature detection device, and determine a temperature value according to the temperature detection signal; Based on the temperature value, a linear compensation process is performed on the voltage detection signal to obtain a calibrated voltage signal.

[0006] In one embodiment, the linear compensation process is specifically formulated as follows: ; Among them, the is the voltage detection signal after temperature compensation; is the current temperature The actual measured voltage without compensation is is the temperature compensation coefficient; is the reference temperature; is the current temperature.

[0007] In one embodiment, the specific method of controlling the switch component to conduct the path between the output end of the photovoltaic device and the charging pile according to the multiple absolute voltage differences includes: Under the condition that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the plurality of absolute voltage differences are arranged in a gradient from small to large, and the charging power of the electrical load corresponding to the absolute voltage difference is determined; According to the output power of the photovoltaic device and the charging power of the electrical load, the electrical load that can be satisfied by the output power of the photovoltaic device is determined, and the switch component is controlled to conduct the path between the output end of the photovoltaic device and the charging pile corresponding to the electrical load.

[0008] In one embodiment, before the step of ensuring that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the control method further comprises: Under the condition that multiple absolute voltage differences are greater than a preset voltage difference, the switch component is controlled to disconnect the path between the output end of the photovoltaic device and the charging pile corresponding to the power load, and to connect the path between the output end of the photovoltaic device and the energy storage device.

[0009] In one embodiment, after the step of ensuring that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the control method further comprises: Under the condition that a plurality of the absolute voltage differences are greater than a preset voltage difference, and the output power of the photovoltaic device is greater than the sum of the charging powers of the plurality of the electrical loads, the switch component is controlled to open a path between the output end of the photovoltaic device and the charging piles corresponding to the plurality of the electrical loads, and to open a path between the output end of the photovoltaic device and the energy storage device.

[0010] In one embodiment, the step of obtaining the charging voltage required by the plurality of electrical loads specifically includes: Obtaining the type of charging voltage required by the electrical load; Under the condition that the type of charging voltage required by the electrical load is different from the type of real-time output voltage of the photovoltaic device, the switch component is controlled to disconnect the path between the output end of the photovoltaic device and the charging pile corresponding to the electrical load.

[0011] The present invention also proposes a control device, which includes: a memory, a processor, and a photovoltaic storage and charging system control program stored in the memory and running on the processor, wherein the control program is configured to implement the steps of the photovoltaic storage and charging system control method as described in any one of the above items.

[0012] The present invention also proposes a photo-storage and charging system, which includes a photovoltaic device, an energy storage device, a control device, a switch component, a plurality of charging piles and a plurality of electrical loads with different charging voltages; the output end of the photovoltaic device is electrically connected to the input end of the energy storage device and the first end of the switch component respectively; the output end of the energy storage device is electrically connected to the second end of the switch component; the controlled end of the switch component is electrically connected to the control device, and the third end of the switch component is electrically connected to a plurality of charging piles respectively; the plurality of charging piles are electrically connected one-to-one with a plurality of electrical loads with different charging voltages respectively; and the control device as described above.

[0013] The technical solution of the present invention obtains the voltage detection signal of the output end of the photovoltaic device, thereby confirming the real-time output voltage of the photovoltaic device through the voltage detection signal, and then confirming the working state of the photovoltaic device at this time. Further, through the communication connection between multiple charging piles and multiple power loads, the charging voltage required by multiple power loads is obtained. Among them, the real-time output voltage of the photovoltaic device and the charging voltage required by the multiple power loads are subtracted to obtain multiple absolute voltage differences. It can be understood that the size of the multiple absolute voltage differences represents the size of the gap between the real-time output voltage of the photovoltaic device and the charging voltage required by the multiple power loads. The control device arranges the absolute voltage differences from effective to large in order to control the switch component to conduct the path between the output end of the photovoltaic device and the corresponding charging pile, thereby effectively avoiding the condition that the difference between the real-time output voltage of the photovoltaic device and the charging voltage required by the power load is smaller, and the charging pile with a larger difference between the real-time output voltage of the photovoltaic device and the charging voltage required by the power load is fixedly selected. In addition, for the equipment that the photovoltaic device cannot power, the control device will control the switch component to conduct the path between the energy storage device and the corresponding charging pile, so as to power other power loads. Through this control method, the energy conversion efficiency and safety of the solar storage and charging system can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 Schematic diagram of the control method of the solar storage and charging system of the present invention; Figure 2 A schematic diagram of a flow chart of an embodiment of a control method of a solar storage and charging system of the present invention; Figure 3 The figure is a flow chart of another embodiment of the control method of the solar energy storage and charging system of the present invention.

[0016] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] In the control scheme of the existing photovoltaic storage and charging system, it is usually the case that the photovoltaic device generates sufficient electricity, and the electric energy generated by the photovoltaic device is converted into voltage to supply power to the electrical load. Under the condition that the electric energy generated by the photovoltaic device is insufficient to supply power to the electrical load, it will be further supplied by the energy storage device and / or the power grid. Therefore, it can be understood that in the photovoltaic storage and charging system, the priority of the equipment supplying power to the electrical load will be photovoltaic equipment, energy storage equipment or power grid in order. Among them, the power supply priority between the energy storage device and the power grid will also be adjusted according to the fluctuation of the power grid price. However, the output voltage of the photovoltaic device is unstable, and it is necessary to set up corresponding voltage conversion equipment and voltage stabilization equipment to achieve the stability of the output voltage. However, when the output voltage of the photovoltaic device is too different from the charging voltage required by the electrical load, the voltage conversion device will have problems such as low conversion efficiency, increased heat generation and reduced device service life.

[0021] Therefore, reference Figure 1The present invention proposes a control method for a photovoltaic storage and charging system, the photovoltaic storage and charging system comprising a photovoltaic device, an energy storage device, a control device, a switch component, a plurality of charging piles and a plurality of electrical loads with different charging voltages; the output end of the photovoltaic device is electrically connected to the input end of the energy storage device and the first end of the switch component respectively; the output end of the energy storage device is electrically connected to the second end of the switch component; the controlled end of the switch component is electrically connected to the control device, and the third end of the switch component is electrically connected to a plurality of charging piles respectively; the plurality of charging piles are electrically connected to a plurality of electrical loads with different charging voltages in a one-to-one correspondence; the control method comprises: Step S100: obtaining a voltage detection signal at the output end of the photovoltaic device, and determining a real-time output voltage of the photovoltaic device according to the voltage detection signal; Step S200: Under the condition that a communication connection is established between the plurality of electrical loads and the plurality of charging piles, the charging voltage required by the plurality of electrical loads is obtained; Step S300: subtracting the real-time output voltage of the photovoltaic device from the charging voltages of the plurality of electrical loads to obtain a plurality of absolute voltage difference values; Step S400: According to the multiple absolute voltage differences, control the switch component to conduct the path between the output end of the photovoltaic device and the charging pile, and control the switch component to conduct the path between the output end of the energy storage device and the charging pile.

[0022] It is understandable that the charging voltage may be different for different power loads. For example, when the power load of the charging pile connected to the light storage and charging system is an electric vehicle, the internal voltage architecture is also different for different models, which can be 400V, 800V and other voltage architectures. Therefore, in practical applications, the light storage and charging system needs to charge power loads with different charging voltages. In addition, the real-time output voltage of the photovoltaic device is greatly affected by the environment, which causes the real-time output voltage of the photovoltaic device to be unstable. When the photovoltaic device charges the power load, it is usually necessary to use a corresponding voltage conversion device and a voltage stabilizing device so that the real-time output voltage of the photovoltaic device can always meet the needs of the power load after the voltage conversion device and the voltage stabilizing device. However, when the real-time output voltage of the photovoltaic device fluctuates greatly, it leads to a large gap between the real-time output voltage of the photovoltaic device and the charging voltage required by the power load, thereby increasing the workload of the voltage conversion device and the voltage stabilizing device, and there are problems such as low conversion efficiency, increased heat generation and reduced device service life.

[0023] In this embodiment, the voltage detection device can be implemented by a device provided with a corresponding voltage detection circuit, such as a voltage divider circuit, a differential amplifier circuit, a comparator circuit, and other voltage detection circuits. Among them, the output end of the voltage detection device needs to be electrically connected to the output end of the photovoltaic device, so as to obtain the real-time output voltage of the photovoltaic device when the photovoltaic device is working. It can be understood that the control device will confirm the real-time output voltage of the photovoltaic device based on the voltage detection signal output by the voltage detection device, and select a qualified power load based on the real-time output voltage of the photovoltaic device, and then control the corresponding switch component to conduct the path between the output end of the photovoltaic device and the corresponding charging pile.

[0024] In this embodiment, when a physical electrical connection is established between the power load and the charging pile, a communication connection will be established between the charging interface of the power load and the charging gun of the charging pile, thereby confirming the charging voltage required by the power load. Further, in the light storage and charging system, there are multiple charging piles and multiple power loads, and the charging voltages between multiple different power loads are also different. Therefore, when a physical electrical connection is established between multiple power loads and multiple charging piles in a one-to-one correspondence, the charging pile will obtain different charging voltages required by multiple different power loads. Taking the power load as an electric car as an example, after a physical electrical connection is established between the charging interface of the electric car and the charging gun of the charging pile, the electric car and the charging pile will begin to try to establish communication. This is usually achieved through technologies such as CAN bus or PLC. Among them, PLC is a way to transmit data through the power line itself, allowing electric vehicles and charging piles to continue to communicate even during the charging process. Next, a series of identity authentication and configuration exchanges will be carried out between the electric car and the charging pile. This stage may include authentication of the user, determination of the maximum acceptable charging current, selection of AC or DC charging mode, etc. The electric car also sends information about its current battery status to the charger, such as charge level, required charging voltage and current, etc. Based on this information, the charger adjusts its output to match the vehicle's needs.

[0025] In this embodiment, the control device will obtain the real-time output voltage of the photovoltaic device and the charging voltage of the power load electrically connected to the charging pile through the voltage detection device and the charging pile respectively. The control device performs differential processing on the real-time output voltage of the photovoltaic device and the charging voltage of the power load, thereby obtaining multiple absolute voltage differences. It can be understood that the charging voltage of the power load may be greater than the real-time output voltage of the photovoltaic device, or less than the real-time output voltage of the photovoltaic device. However, the absolute voltage difference between the charging voltage of the power load and the real-time output voltage of the photovoltaic device can measure the gap between the charging voltage and the real-time output voltage between the two.

[0026] In this embodiment, the control device will sort the obtained multiple absolute voltage differences from small to large, so as to control the switch component to conduct the path between the output end of the photovoltaic device and the power load with a small absolute voltage difference. Among them, the power load that the photovoltaic device can power can be one or more. For example, the control device obtains the real-time output voltage of the photovoltaic device at this time as 500V through the voltage detection device, and confirms through the charging pile that the charging voltage of the connected power load is 400V for the first power load and 800V for the second power load. It can be concluded that the absolute voltage difference between the charging voltage of the first power load and the real-time output voltage of the photovoltaic device is 100V; the absolute voltage difference between the charging voltage of the second power load and the real-time output voltage of the photovoltaic device is 300V. When the output power of the photovoltaic device can only meet one of the first power load and the second power load, the control device will conduct the path between the output end of the photovoltaic device and the charging pile electrically connected to the first power load, and conduct the path between the output end of the energy storage device and the charging pile electrically connected to the second power load. It is understandable that the real-time output voltage of the photovoltaic device may be in a changing state. For example, the control device obtains the real-time output voltage of the photovoltaic device at this time from 500V to 700V through the voltage detection device, and confirms through the charging pile that the charging voltage of the connected power load is still 400V for the first power load and 800V for the second power load. It can be concluded that the absolute voltage difference between the charging voltage of the first power load and the real-time output voltage of the photovoltaic device is 300V; the absolute voltage difference between the charging voltage of the second power load and the real-time output voltage of the photovoltaic device is 100V. When the output power of the photovoltaic device can only meet one of the first power load and the second power load, the control device will conduct the path between the output end of the photovoltaic device and the charging pile electrically connected to the second power load, and conduct the path between the output end of the energy storage device and the charging pile electrically connected to the first power load. Through this automatic switching conduction method, the real-time output voltage of the photovoltaic device is always powered by the power load with the most appropriate absolute voltage difference, thereby effectively avoiding the problems of low conversion efficiency, increased heat generation and reduced device service life.

[0027] By acquiring the voltage detection signal of the output end of the photovoltaic device, the real-time output voltage of the photovoltaic device is confirmed by the voltage detection signal, and then the working state of the photovoltaic device at this time is confirmed. Further, the communication connection between multiple charging piles and multiple power loads is used to obtain the charging voltage required by multiple power loads. Among them, the real-time output voltage of the photovoltaic device and the charging voltage required by the multiple power loads are subtracted to obtain multiple absolute voltage differences. It can be understood that the size of the multiple absolute voltage differences represents the size of the gap between the real-time output voltage of the photovoltaic device and the charging voltage required by the multiple power loads. The control device arranges the absolute voltage differences from effective to large in order to control the switch component to conduct the path between the output end of the photovoltaic device and the corresponding charging pile, thereby effectively avoiding the condition that the difference between the real-time output voltage of the photovoltaic device and the charging voltage required by the power load is smaller, and the charging pile with a larger difference between the real-time output voltage of the photovoltaic device and the charging voltage required by the power load is fixedly selected. In addition, for the equipment that the photovoltaic device cannot power, the control device will control the switch component to conduct the path between the energy storage device and the corresponding charging pile, so as to power other power loads. Through this control method, the energy conversion efficiency and safety of the solar storage and charging system can be effectively improved.

[0028] refer to Figure 2 In one embodiment of the present invention, the photovoltaic storage and charging system further includes a voltage detection device and a temperature detection device, the input end of the voltage detection device is electrically connected to the output end of the photovoltaic device, and the output end of the voltage detection device is electrically connected to the control device; the temperature detection device is arranged at the output end of the photovoltaic device, and the output end of the temperature detection device is electrically connected to the control device; the specific method for determining the real-time output voltage of the photovoltaic device according to the voltage detection signal includes: Step S110: determining an original voltage signal output by the voltage detection device according to the voltage detection signal; Step S120: obtaining a temperature detection signal output by the temperature detection device, and determining a temperature value according to the temperature detection signal; Step S130: Based on the temperature value, perform linear compensation processing on the voltage detection signal to obtain a calibrated voltage signal.

[0029] It is understandable that the voltage detection signal output by the voltage detection device will be affected by the change in temperature. The input end of the voltage detection device is also electrically connected to the output end of the photovoltaic device, and the output end of the photovoltaic device is on the backlight surface of the photovoltaic device. Therefore, when the photovoltaic device is working, the temperature of its backlight surface will still be at a high state, which will cause the accuracy of the voltage detection signal output by the voltage detection device to fluctuate greatly.

[0030] In the present embodiment, the voltage detection device can be implemented by a device provided with a corresponding voltage detection circuit, such as a voltage divider circuit, a differential amplifier circuit, a comparator circuit and other voltage detection circuits. The temperature detection device can be implemented by a device provided with a corresponding temperature detection circuit, such as a resistance divider circuit based on an NTC resistor or an NTC probe, and a resistance divider circuit based on a PTC resistor or a PTC probe. Among them, it can be understood that the area of ​​the photovoltaic device is large, and there may be certain differences in the temperature of different areas. Therefore, multiple temperature detection devices can be set in different areas of the photovoltaic device. The control device can determine multiple temperature values ​​according to multiple temperature detection signals, and calculate the actual ambient temperature through a preset temperature algorithm, such as an average value, a weighted calculation, etc., so as to improve the accuracy of the detection of the output end of the photovoltaic device.

[0031] In this embodiment, the control device directly obtains the output voltage detection signal of the voltage detection device through the voltage detection device, and marks it as the original voltage signal. It can be understood that the original voltage signal is the voltage detection signal directly output by the voltage detection device, and the voltage detection signal has the problem of temperature influence, that is, the original voltage signal has the problem that the accuracy is greatly affected by temperature. Further, the control device obtains the temperature detection signal of the output end of the photovoltaic device through the temperature detection device, and confirms the temperature value of the output end of the photovoltaic device according to the temperature detection signal. The control device confirms the temperature value through the temperature detection signal, and obtains the calibration voltage signal according to the temperature value and the corresponding linear compensation formula. It can be understood that the calibration voltage signal is a voltage signal obtained by the control device according to the temperature value corresponding to the original voltage signal and the temperature detection signal. The calibration voltage signal can be understood as a real-time output voltage of a photovoltaic device that has been calibrated to overcome the temperature influence.

[0032] Optionally, the linear compensation processing formula is specifically: ; Among them, the is the voltage detection signal after temperature compensation; is the current temperature The actual measured voltage without compensation is is the temperature compensation coefficient; is the reference temperature; is the current temperature.

[0033] refer to Figure 3 In one embodiment of the present invention, the specific method of controlling the switch component to conduct the path between the output end of the photovoltaic device and the charging pile according to the multiple absolute voltage differences includes: Step S410: Under the condition that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the plurality of absolute voltage differences are arranged in a gradient from small to large, and the charging power of the electrical load corresponding to the absolute voltage difference is determined; Step S420: Determine the power load that can be satisfied by the output power of the photovoltaic device according to the output power of the photovoltaic device and the charging power of the power load, and control the switch component to conduct the path between the output end of the photovoltaic device and the charging pile corresponding to the power load.

[0034] In this embodiment, when the photovoltaic device is actually working, its output power may be able to meet the charging needs of more than one power load. Therefore, the control device will arrange multiple power loads according to the absolute voltage difference from small to large according to the gradient of the absolute voltage difference, so as to confirm the priority of different power loads in the power supply direction of the photovoltaic device, and further confirm the charging power of these power loads, so as to confirm which power loads with the top priority can be satisfied by the output power of the photovoltaic device, and then control the switch component to conduct the path between the output end of the photovoltaic device and the charging pile corresponding to the power load, so as to achieve the effect of the photovoltaic device supplying power to at least one load. Among them, when the output power of the photovoltaic device changes, the control device can dynamically adjust the switch component so that the switch component further conducts or disconnects the path between the photovoltaic device and the corresponding charging pile, so as to avoid wasting the output power of the photovoltaic device or the power load cannot be effectively charged.

[0035] Optionally, before the step of ensuring that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the control method further comprises: Under the condition that multiple absolute voltage differences are greater than a preset voltage difference, the switch component is controlled to disconnect the path between the output end of the photovoltaic device and the charging pile corresponding to the power load, and to connect the path between the output end of the photovoltaic device and the energy storage device.

[0036] In this embodiment, the preset voltage difference is a preset value for protecting the voltage conversion device and the voltage stabilizing device. It is understandable that when the difference between the real-time output voltage of the photovoltaic device and the charging voltage required by the electrical load is too large, the voltage conversion device and the voltage stabilizing device will work excessively due to the large voltage difference, which will reduce the service life of the voltage conversion device and the voltage stabilizing device, and will also cause the temperature of the voltage conversion device and the voltage stabilizing device to rise due to the temperature rise, thereby reducing the safety of the light storage and charging system. Therefore, by setting the preset voltage difference, the problem of forcing the voltage conversion device and the voltage stabilizing device to work when the difference between the real-time output voltage of the photovoltaic device and the charging voltage required by the electrical load is too large is avoided.

[0037] Optionally, after the step of ensuring that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the control method further comprises: Under the condition that a plurality of the absolute voltage differences are greater than a preset voltage difference, and the output power of the photovoltaic device is greater than the sum of the charging powers of the plurality of the electrical loads, the switch component is controlled to open a path between the output end of the photovoltaic device and the charging piles corresponding to the plurality of the electrical loads, and to open a path between the output end of the photovoltaic device and the energy storage device.

[0038] In this embodiment, there are multiple power loads whose absolute voltage difference between the charging voltage and the real-time output voltage of the photovoltaic device is greater than the preset voltage difference, that is, there are power loads that do not meet the power supply requirements of the photovoltaic device among the multiple power loads. Therefore, the control device will screen the path between the output end of the photovoltaic device and the charging pile according to the comparison relationship between the multiple absolute voltage differences and the preset voltage differences. When the absolute voltage difference between the charging voltage of a certain power load and the real-time output voltage of the photovoltaic device is greater than the preset voltage difference, the control device will control the switch component to disconnect the path between the output end of the photovoltaic device and the charging pile of the corresponding power load. Further, when the output power of the photovoltaic device is greater than the sum of the charging powers of the multiple power loads, the control device will control the path between the output end of the photovoltaic device and the energy storage device to be turned on. It can be understood that at this time, the energy storage device is also electrically connected to the output end of the photovoltaic device as a power load. In this way, the excessive work of the voltage conversion device and the voltage stabilizing device in the light storage and charging system is avoided, and the waste of energy generated by the photovoltaic device is avoided.

[0039] In one embodiment of the present invention, the step of obtaining the charging voltage required by the plurality of electrical loads specifically includes: Obtaining the type of charging voltage required by the electrical load; Under the condition that the type of charging voltage required by the electrical load is different from the type of real-time output voltage of the photovoltaic device, the switch component is controlled to disconnect the path between the output end of the photovoltaic device and the charging pile corresponding to the electrical load.

[0040] It is understandable that the voltage type output by the photovoltaic device is usually direct current, while the electrical load may have both a charging voltage of direct current and an electrical load of alternating current. For example, taking electric vehicles as an example, most existing electric vehicles usually require a charging voltage of direct current in the fast charging mode, and an alternating current in the slow charging mode. Therefore, when the real-time output voltage of the photovoltaic device is direct current, and the voltage required by the electrical load is alternating current, the light storage and charging system needs to select a corresponding inverter device to convert the direct current output by the photovoltaic device into the corresponding alternating current and output it to meet the charging needs of the electrical load. It is understandable that the process of voltage inversion in the inverter device will lead to further loss of electric energy. Therefore, the control device will match the real-time output voltage type of the photovoltaic device and the charging voltage type of the electrical device to avoid the situation where the charging voltage type of the electrical device is consistent with the real-time output voltage type of the photovoltaic device, and still select different voltage types for matching.

[0041] The present invention also proposes a control device, the control device comprising: a memory, a processor, and a control program for a photovoltaic storage and charging system stored in the memory and running on the processor, the control program being configured to implement the steps of the control method for a photovoltaic storage and charging system as described in any one of the above items. It is worth noting that since the control device of the present invention is based on the control method for a photovoltaic storage and charging system described above, the embodiments of the control device of the present invention include all technical solutions of all embodiments of the control method for a photovoltaic storage and charging system described above, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0042] The present invention also proposes a photoelectric storage and charging system, which includes a photovoltaic device, an energy storage device, a control device, a switch component, a plurality of charging piles and a plurality of electrical loads with different charging voltages; the output end of the photovoltaic device is electrically connected to the input end of the energy storage device and the first end of the switch component respectively; the output end of the energy storage device is electrically connected to the second end of the switch component; the controlled end of the switch component is electrically connected to the control device, and the third end of the switch component is electrically connected to a plurality of charging piles respectively; the plurality of charging piles are electrically connected one-to-one with a plurality of electrical loads with different charging voltages respectively; and the control device as described above. It is worth noting that since the photoelectric storage and charging system of the present invention is based on the above-mentioned control device, the embodiments of the photoelectric storage and charging system of the present invention include all the technical solutions of all the embodiments of the above-mentioned control device, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0043] In one embodiment of the present invention, the solar storage and charging system further includes: A voltage detection device, wherein the input end of the voltage detection device is electrically connected to the output end of the photovoltaic device, and the output end of the voltage detection device is electrically connected to the control device; the voltage detection device is used to detect the real-time output voltage of the photovoltaic device and output a corresponding voltage detection signal; A temperature detection device, wherein the temperature detection device is arranged at the output end of the photovoltaic device; the temperature detection device is electrically connected to the control device; the temperature detection device is used to detect the temperature of the output end of the photovoltaic device and output a corresponding temperature detection signal.

[0044] In this embodiment, the control device confirms the real-time output voltage of the photovoltaic device based on the voltage detection signal output by the voltage detection device, confirms the temperature of the output end of the photovoltaic device based on the temperature detection signal output by the temperature detection device, and then adjusts the voltage detection signal output by the voltage detection device according to the linear compensation formula to obtain a calibrated voltage detection signal.

[0045] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A control method for a solar storage and charging system, characterized in that: The photovoltaic storage and charging system includes a photovoltaic device, an energy storage device, a control device, a switch component, a plurality of charging piles and a plurality of electrical loads with different charging voltages; the output end of the photovoltaic device is electrically connected to the input end of the energy storage device and the first end of the switch component respectively; the output end of the energy storage device is electrically connected to the second end of the switch component; the controlled end of the switch component is electrically connected to the control device, and the third end of the switch component is electrically connected to the plurality of charging piles respectively; The plurality of charging piles are electrically connected to a plurality of power loads having different charging voltages in a one-to-one correspondence; the control method comprises: Acquiring a voltage detection signal from an output end of the photovoltaic device, and determining a real-time output voltage of the photovoltaic device according to the voltage detection signal; Under the condition that a communication connection is established between the plurality of electrical loads and the plurality of charging piles, the charging voltage required by the plurality of electrical loads is obtained; Subtracting the real-time output voltage of the photovoltaic device from the charging voltages of the plurality of electrical loads to obtain a plurality of absolute voltage difference values; According to the multiple absolute voltage differences, the switch component is controlled to conduct the path between the output end of the photovoltaic device and the charging pile, and the switch component is controlled to conduct the path between the output end of the energy storage device and the charging pile.

2. The control method of the photovoltaic storage and charging system according to claim 1, characterized in that: The photovoltaic storage and charging system further includes a voltage detection device and a temperature detection device, wherein the input end of the voltage detection device is electrically connected to the output end of the photovoltaic device, and the output end of the voltage detection device is electrically connected to the control device; the temperature detection device is arranged at the output end of the photovoltaic device, and the output end of the temperature detection device is electrically connected to the control device; the specific method for determining the real-time output voltage of the photovoltaic device according to the voltage detection signal includes: Determining an original voltage signal output by the voltage detection device according to the voltage detection signal; Acquire a temperature detection signal output by the temperature detection device, and determine a temperature value according to the temperature detection signal; Based on the temperature value, a linear compensation process is performed on the voltage detection signal to obtain a calibrated voltage signal.

3. The control method of the solar storage and charging system according to claim 2, characterized in that: The formula for the linear compensation process is specifically: ； Among them, the is the voltage detection signal after temperature compensation; is the current temperature The actual measured voltage without compensation is is the temperature compensation coefficient; is the reference temperature; is the current temperature.

4. The control method of the photovoltaic storage and charging system according to claim 1, characterized in that: The specific method of controlling the switch component to conduct the path between the output end of the photovoltaic device and the charging pile according to the multiple absolute voltage differences includes: Under the condition that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the plurality of absolute voltage differences are arranged in a gradient from small to large, and the charging power of the electrical load corresponding to the absolute voltage difference is determined; According to the output power of the photovoltaic device and the charging power of the electrical load, the electrical load that can be satisfied by the output power of the photovoltaic device is determined, and the switch component is controlled to conduct the path between the output end of the photovoltaic device and the charging pile corresponding to the electrical load.

5. The control method of the photovoltaic storage and charging system according to claim 4, characterized in that: Before the step of ensuring that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the control method further comprises: Under the condition that multiple absolute voltage differences are greater than a preset voltage difference, the switch component is controlled to disconnect the path between the output end of the photovoltaic device and the charging pile corresponding to the power load, and to connect the path between the output end of the photovoltaic device and the energy storage device.

6. The control method of the photovoltaic storage and charging system according to claim 4, characterized in that: After the step of ensuring that the output power of the photovoltaic device meets the charging demand of at least one electrical load, the control method further comprises: Under the condition that a plurality of the absolute voltage differences are greater than a preset voltage difference, and the output power of the photovoltaic device is greater than the sum of the charging powers of the plurality of the electrical loads, the switch component is controlled to open a path between the output end of the photovoltaic device and the charging piles corresponding to the plurality of the electrical loads, and to open a path between the output end of the photovoltaic device and the energy storage device.

7. The control method of the photovoltaic storage and charging system according to claim 1, characterized in that: The step of obtaining the charging voltage required by the plurality of electrical loads specifically comprises: Obtaining the type of charging voltage required by the electrical load; Under the condition that the type of charging voltage required by the electrical load is different from the type of real-time output voltage of the photovoltaic device, the switch component is controlled to disconnect the path between the output end of the photovoltaic device and the charging pile corresponding to the electrical load.

8. A control device, characterized in that: The control device includes: a memory, a processor, and a photovoltaic storage and charging system control program stored in the memory and running on the processor, and the control program is configured to implement the steps of the photovoltaic storage and charging system control method according to any one of claims 1-7.

9. A light storage and charging system, characterized in that: The photovoltaic storage and charging system includes a photovoltaic device, an energy storage device, a control device, a switch component, a plurality of charging piles and a plurality of electrical loads with different charging voltages; the output end of the photovoltaic device is electrically connected to the input end of the energy storage device and the first end of the switch component respectively; the output end of the energy storage device is electrically connected to the second end of the switch component; the controlled end of the switch component is electrically connected to the control device, and the third end of the switch component is electrically connected to a plurality of charging piles respectively; the plurality of charging piles are electrically connected to a plurality of electrical loads with different charging voltages one by one; And the control device as claimed in claim 8.

10. The solar storage and charging system according to claim 9, characterized in that: The optical storage and charging system further includes: A voltage detection device, wherein the input end of the voltage detection device is electrically connected to the output end of the photovoltaic device, and the output end of the voltage detection device is electrically connected to the control device; the voltage detection device is used to detect the real-time output voltage of the photovoltaic device and output a corresponding voltage detection signal; A temperature detection device, wherein the temperature detection device is arranged at the output end of the photovoltaic device; the temperature detection device is electrically connected to the control device; the temperature detection device is used to detect the temperature of the output end of the photovoltaic device and output a corresponding temperature detection signal.

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