Alternating current output superposition method and device of multiple inverters, electronic equipment and readable storage medium

Abstract

The embodiment of the invention discloses an alternating current output superposition method and device of multiple inverters, electronic equipment and a readable storage medium. The method comprises the following steps: determining a first voltage value of direct current output by a photovoltaic panel connected with each inverter in a plurality of inverters; each first voltage value corresponds to one photovoltaic panel; under the condition that a target voltage value in the multiple first voltage values is smaller than a preset voltage value, modulating waves are output to other inverters, and the modulating waves are used for adjusting alternating currents output by photovoltaic waves corresponding to other inverters; wherein the other inverters are the inverters, except the inverter corresponding to the target voltage value, in the plurality of inverters.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photovoltaic power generation technology, and in particular to a method, device, electronic device and readable storage medium for overlapping the AC power outputs of multiple inverters. Background Art

[0002] In photovoltaic power generation technology, solar panel arrays and inverters are two important components in photovoltaic grid-connected power generation systems. Solar panels convert solar energy into electrical energy and output direct current, while inverters convert the direct current of solar panels into usable alternating current and feed it into the grid.

[0003] Although solar energy resources are infinite, the conversion efficiency of solar cells is very low due to the low solar radiation density. At present, the conversion efficiency of most solar cells is only 10%-20%. In this context, improving the conversion efficiency of the inverter is crucial to improving the overall efficiency of the photovoltaic grid-connected power generation system.

[0004] When the DC voltage at both ends of the solar panel array is lower than a certain voltage, the modulation wave of the inverter will produce over-modulation when controlling the inverter to convert the DC power at both ends of the solar panel array into AC power, which will cause the waveform of the AC power output by the inverter to be distorted. When the distortion is serious, the AC power output by the inverter will not meet the requirements of grid connection. Summary of the invention

[0005] The embodiments of the present application provide a method, device, electronic device and readable storage medium for overlapping the AC power outputs of multiple inverters, which can avoid waveform distortion of the AC power output by the inverters.

[0006] In order to solve the above technical problems, the embodiments of the present application adopt the following technical solutions:

[0007] According to a first aspect of an embodiment of the present application, a method for overlapping the AC power outputs of multiple inverters is provided, the method comprising: determining a first voltage value of the DC power output by a photovoltaic panel connected to each of the multiple inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; when a target voltage value among the multiple first voltage values ​​is less than a preset voltage value, outputting a modulation wave to other inverters, the modulation wave being used to adjust the AC power output by the photovoltaic wave corresponding to the other inverters; wherein the other inverters are the inverters among the multiple inverters except the inverter corresponding to the target voltage value.

[0008] In a possible implementation manner, after outputting the modulation wave to the other inverters, the method further includes: controlling the output end of the inverter corresponding to the target voltage value to be in a disconnected state.

[0009] In a possible implementation, after outputting the modulated wave to the other inverters, the method further includes: obtaining a first harmonic distortion parameter corresponding to the voltage of the alternating current output by the other inverters; and when a parameter value of the first harmonic distortion parameter is greater than a preset threshold, controlling the output end of the first inverter among the other inverters to be in a disconnected state.

[0010] In a possible implementation, after controlling the output end of the first inverter among the other inverters to be in a disconnected state, the method further includes: obtaining a second harmonic distortion parameter corresponding to the voltage of the alternating current output by the second inverter; the second inverter is the inverter among the other inverters except the first inverter; when the parameter value of the second harmonic distortion parameter is greater than the preset threshold, controlling the output end of a third inverter among the second inverters to be in a disconnected state.

[0011] The embodiment of the present application provides a method for coinciding the AC outputs of multiple inverters, which can determine the first voltage value of the DC output of the photovoltaic panel connected to each of the multiple inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; when the target voltage value among the multiple first voltage values ​​is less than the preset voltage value, a modulation wave is output to other inverters, and the modulation wave is used to adjust the AC output of the photovoltaic wave corresponding to the other inverters; wherein the other inverters are the inverters except the inverters corresponding to the target voltage value among the multiple inverters. Since it can be determined first whether the voltage value of the DC output of multiple photovoltaic panels connected to the multiple inverters is less than the preset voltage value, and when the voltage value of the DC output of a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is output to other inverters, that is, a modulation wave is output only to the inverter whose DC voltage value of the corresponding photovoltaic panel is greater than or equal to the preset voltage value, therefore, it can avoid the overmodulation when the DC output of other inverters is converted into AC, thereby avoiding the waveform distortion after the AC output of other inverters is coinciding.

[0012] According to a second aspect of an embodiment of the present application, there is provided an AC output coincidence device for a plurality of inverters, the AC output coincidence device for the plurality of inverters comprising: a determination module and an output module; the determination module is used to determine a first voltage value of the DC power outputted by a photovoltaic panel connected to each of the plurality of inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; the output module is used to output a modulation wave to other inverters when a target voltage value among the plurality of first voltage values ​​determined by the determination module is less than a preset voltage value, the modulation wave being used to convert the DC power outputted by the photovoltaic panels corresponding to the other inverters into AC power; wherein the other inverters are the inverters among the plurality of inverters except the inverter corresponding to the target voltage value.

[0013] In a possible implementation, the AC output overlap device of the plurality of inverters further includes: a control module; the control module is configured to control the output end of the inverter corresponding to the target voltage value to be in a disconnected state.

[0014] In a possible implementation, the AC power output overlap device of the multiple inverters also includes: an acquisition module and a control module; the acquisition module is used to obtain a first harmonic distortion parameter corresponding to the voltage of the AC power output by the other inverters; the control module is used to control the output end of the first inverter among the other inverters to be in a disconnected state when the parameter value of the first harmonic distortion parameter obtained by the acquisition module is greater than a preset threshold.

[0015] In a possible implementation, the acquisition module is further used to acquire a second harmonic distortion parameter corresponding to the voltage of the alternating current output by the second inverter; the second inverter is the inverter other than the first inverter among the other inverters; the control module is further used to control the output end of the third inverter in the second inverter to be in a disconnected state when the parameter value of the second harmonic distortion parameter acquired by the acquisition module is greater than the preset threshold.

[0016] The embodiment of the present application provides an AC output overlap device for multiple inverters. Since it is possible to first determine whether the voltage value of the DC power output by multiple photovoltaic panels connected to the multiple inverters is less than a preset voltage value, and when the voltage value of the DC power output by a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is output to other inverters, that is, a modulation wave is output only to the inverter whose DC power output voltage value of the corresponding photovoltaic panel is greater than or equal to the preset voltage value. Therefore, overmodulation can be avoided when the DC power output by other inverters is converted into AC power, thereby avoiding waveform distortion after the AC power output of other inverters is overlapped.

[0017] According to a third aspect of an embodiment of the present application, an electronic device is provided, comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.

[0018] In a fourth aspect of an embodiment of the present application, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0019] In the embodiment of the present application, the first voltage value of the direct current outputted by the photovoltaic panel connected to each of the multiple inverters can be determined; each of the first voltage values ​​corresponds to a photovoltaic panel; when the target voltage value among the multiple first voltage values ​​is less than the preset voltage value, a modulation wave is outputted to other inverters, and the modulation wave is used to adjust the alternating current outputted by the photovoltaic wave corresponding to the other inverters; wherein the other inverters are the inverters except the inverters corresponding to the target voltage value among the multiple inverters. Since it can be determined first whether the voltage value of the direct current outputted by the multiple photovoltaic panels connected to the multiple inverters is less than the preset voltage value, and when the voltage value of the direct current outputted by a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is outputted to other inverters, that is, a modulation wave is outputted only to the inverter whose voltage value of the direct current outputted by the corresponding photovoltaic panel is greater than or equal to the preset voltage value, it can avoid the overmodulation when the direct current outputted by other inverters is converted into alternating current, thereby avoiding the distortion of the waveform after the alternating current outputted by other inverters overlaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 One of the flow charts of the method for overlapping the AC power outputs of multiple inverters provided in an embodiment of the present application;

[0021] Figure 2 A second flow chart of a method for overlapping AC power outputs of multiple inverters provided in an embodiment of the present application;

[0022] Figure 3 A third flow chart of a method for overlapping AC power outputs of multiple inverters provided in an embodiment of the present application;

[0023] Figure 4 A fourth flowchart of a method for overlapping AC power outputs of multiple inverters provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of an AC power output overlap device for multiple inverters provided in an embodiment of the present application;

[0025] Figure 6A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects rather than to describe a specific order of the objects. For example, the first guide wheel and the second guide wheel are used to distinguish different dielectric layers rather than to describe a specific order of the dielectric layers.

[0028] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "plurality" refers to two or more than two. For example, a plurality of elements refers to two elements or more than two elements.

[0029] The term "and / or" in this document is a description of the association relationship of associated objects, indicating that there can be three relationships. For example, the display panel and / or backlight can represent: the display panel exists alone, the display panel and backlight exist at the same time, and the backlight exists alone. The symbol " / " in this document indicates that the associated objects are in an or relationship, for example, input / output means input or output.

[0030] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0031] At present, in photovoltaic power generation technology, solar panel arrays and inverters are two important components in photovoltaic grid-connected power generation systems. Solar panels convert solar energy into electrical energy and output direct current, while inverters convert the direct current of solar panels into usable alternating current and connect them to the power grid. Although solar energy resources are infinite, the conversion efficiency of solar cells is very low due to the low density of solar radiation. At present, the conversion efficiency of most solar cells is only 10%-20%. In this context, improving the conversion efficiency of inverters is crucial to improving the overall efficiency of photovoltaic grid-connected power generation systems. When the DC voltage at both ends of the solar panel array is lower than a certain voltage, the modulation wave of the inverter will produce overmodulation when controlling the inverter to convert the DC power at both ends of the solar panel array into AC power, which will cause the waveform of the AC power output by the inverter to be distorted. When the distortion is serious, the AC power output by the inverter will not meet the requirements of grid connection.

[0032] However, in the embodiment of the present application, the first voltage value of the direct current outputted by the photovoltaic panel connected to each of the multiple inverters can be determined; each of the first voltage values ​​corresponds to a photovoltaic panel; when the target voltage value among the multiple first voltage values ​​is less than the preset voltage value, a modulation wave is outputted to other inverters, and the modulation wave is used to adjust the alternating current outputted by the photovoltaic wave corresponding to the other inverters; wherein the other inverters are the inverters except the inverters corresponding to the target voltage value among the multiple inverters. Since it can be determined first whether the voltage value of the direct current outputted by the multiple photovoltaic panels connected to the multiple inverters is less than the preset voltage value, and when the voltage value of the direct current outputted by a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is outputted to other inverters, that is, a modulation wave is outputted only to the inverter whose voltage value of the direct current outputted by the corresponding photovoltaic panel is greater than or equal to the preset voltage value, it can avoid the overmodulation when the direct current outputted by other inverters is converted into alternating current, thereby avoiding the distortion of the waveform after the alternating current outputted by other inverters overlaps.

[0033] The method, device, electronic device and readable storage medium for overlapping the AC power outputs of multiple inverters provided in the embodiments of the present application can be applied in the process of photovoltaic power generation.

[0034] In conjunction with the accompanying drawings, a method, device, electronic device and readable storage medium for overlapping AC power outputs of multiple inverters provided in an embodiment of the present application are described in detail through specific embodiments and their application scenarios.

[0035] Figure 1 A method for overlapping the AC outputs of multiple inverters provided in an embodiment of the present application is shown. Figure 1As shown, the method for overlapping the AC outputs of multiple inverters provided in the embodiment of the present application may include the following steps 101 and 102.

[0036] Step 101: Determine a first voltage value of direct current output by a photovoltaic panel connected to each of the plurality of inverters.

[0037] In the embodiment of the present application, each of the first voltage values ​​corresponds to a photovoltaic panel.

[0038] Step 102: When a target voltage value among the plurality of first voltage values ​​is less than a preset voltage value, output a modulated wave to other inverters.

[0039] In the embodiment of the present application, the modulated wave is used to adjust the alternating current output by the photovoltaic wave corresponding to the other inverters; the other inverters are the inverters among the multiple inverters except the inverter corresponding to the target voltage value.

[0040] In some embodiments of the present application, the modulated wave includes a first periodic wave, and the frequency of the first periodic wave is a first frequency.

[0041] In some embodiments of the present application, other inverters can convert direct current output by other inverters into alternating current under the modulation of the first cycle wave, and the distortion generated is within the tolerable range of the power grid.

[0042] In some embodiments of the present application, the first periodic wave may be a sine wave, a triangle wave, or other periodic waveforms. The first frequency may be a preset frequency.

[0043] Optionally, in the embodiment of the present application, combined with Figure 1 ,like Figure 2 As shown, after the above step 102, the method for overlapping the AC power outputs of multiple inverters provided in the embodiment of the present application may further include the following step 201.

[0044] Step 201: Control the output end of the inverter corresponding to the target voltage value to be in a disconnected state.

[0045] It can be understood that if the output terminal of the inverter corresponding to the target voltage value is in a disconnected state, the inverter cannot output direct current / alternating current.

[0046] The embodiment of the present application provides a method for coinciding the AC outputs of multiple inverters, which can determine the first voltage value of the DC output of the photovoltaic panel connected to each of the multiple inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; when the target voltage value among the multiple first voltage values ​​is less than the preset voltage value, a modulation wave is output to other inverters, and the modulation wave is used to adjust the AC output of the photovoltaic wave corresponding to the other inverters; wherein the other inverters are the inverters except the inverters corresponding to the target voltage value among the multiple inverters. Since it can be determined first whether the voltage value of the DC output of multiple photovoltaic panels connected to the multiple inverters is less than the preset voltage value, and when the voltage value of the DC output of a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is output to other inverters, that is, a modulation wave is output only to the inverter whose DC voltage value of the corresponding photovoltaic panel is greater than or equal to the preset voltage value, therefore, it can avoid the overmodulation when the DC output of other inverters is converted into AC, thereby avoiding the waveform distortion after the AC output of other inverters is coinciding.

[0047] Optionally, in the embodiment of the present application, combined with Figure 1 ,like Figure 3 As shown, after the above step 102, the AC power output overlap method of multiple inverters provided in the embodiment of the present application may also include the following steps 301 and 302.

[0048] Step 301: Obtain a first harmonic distortion parameter corresponding to the voltage of the alternating current output by the other inverters.

[0049] Step 302: When the parameter value of the first harmonic distortion parameter is greater than a preset threshold, control the output end of the first inverter among the other inverters to be in a disconnected state.

[0050] It can be understood that the output end of the first inverter among the other inverters can be controlled to be in a disconnected state, and the split capacitor of the first inverter can be connected to the loop of the power grid connected to the output port of the inverter, and the connection between the split capacitor and the output port of the AC filter can be disconnected, so that the harmonic distortion of the AC power output by the other inverters can be suppressed. Therefore, by controlling the output end of the first inverter among the other inverters to be in a disconnected state, the first harmonic distortion parameter can be reduced.

[0051] Optionally, in the embodiment of the present application, combined with Figure 3 ,like Figure 4 As shown, after the above step 302, the method for overlapping the AC outputs of multiple inverters provided in the embodiment of the present application may further include the following steps 401 and 402.

[0052] Step 401: Obtain a second harmonic distortion parameter corresponding to the voltage of the alternating current output by the second inverter.

[0053] In the embodiment of the present application, the second inverter is the inverter among the other inverters except the first inverter.

[0054] Step 402: When the parameter value of the second harmonic distortion parameter is greater than the preset threshold, control the output end of the third inverter in the second inverter to be in a disconnected state.

[0055] It can be understood that after controlling the output end of the first inverter to be in a disconnected state, the AC power output by the other inverters except the first inverter may still have harmonic distortion. Therefore, the output end of the third inverter can continue to be controlled to be in a disconnected state.

[0056] In the embodiment of the present application, the first voltage value of the direct current outputted by the photovoltaic panel connected to each of the multiple inverters can be determined; each of the first voltage values ​​corresponds to a photovoltaic panel; when the target voltage value among the multiple first voltage values ​​is less than the preset voltage value, a modulation wave is outputted to other inverters, and the modulation wave is used to adjust the alternating current outputted by the photovoltaic wave corresponding to the other inverters; wherein the other inverters are the inverters except the inverters corresponding to the target voltage value among the multiple inverters. Since it can be determined first whether the voltage value of the direct current outputted by the multiple photovoltaic panels connected to the multiple inverters is less than the preset voltage value, and when the voltage value of the direct current outputted by a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is outputted to other inverters, that is, a modulation wave is outputted only to the inverter whose voltage value of the direct current outputted by the corresponding photovoltaic panel is greater than or equal to the preset voltage value, it can avoid the overmodulation when the direct current outputted by other inverters is converted into alternating current, thereby avoiding the distortion of the waveform after the alternating current outputted by other inverters overlaps.

[0057] Figure 5 The structure diagram of the AC output overlap device of multiple inverters provided in the embodiment of the present application is shown. Figure 5As shown, the AC output overlap device 50 of multiple inverters provided in the embodiment of the present application includes: a determination module 51 and an output module 52; the determination module 51 is used to determine the first voltage value of the DC power output by the photovoltaic panel connected to each of the multiple inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; the output module 52 is used to output a modulation wave to other inverters when the target voltage value among the multiple first voltage values ​​determined by the determination module 51 is less than the preset voltage value, and the modulation wave is used to convert the DC power output by the photovoltaic panel corresponding to the other inverters into AC power; wherein the other inverters are the inverters among the multiple inverters except the inverter corresponding to the target voltage value.

[0058] In a possible implementation, the AC output overlap device of the plurality of inverters further includes: a control module; the control module is configured to control the output end of the inverter corresponding to the target voltage value to be in a disconnected state.

[0059] In a possible implementation, the AC power output overlap device of the multiple inverters also includes: an acquisition module and a control module; the acquisition module is used to obtain a first harmonic distortion parameter corresponding to the voltage of the AC power output by the other inverters; the control module is used to control the output end of the first inverter among the other inverters to be in a disconnected state when the parameter value of the first harmonic distortion parameter obtained by the acquisition module is greater than a preset threshold.

[0060] In a possible implementation, the acquisition module is further used to acquire a second harmonic distortion parameter corresponding to the voltage of the alternating current output by the second inverter; the second inverter is the inverter other than the first inverter among the other inverters; the control module is further used to control the output end of the third inverter in the second inverter to be in a disconnected state when the parameter value of the second harmonic distortion parameter acquired by the acquisition module is greater than the preset threshold.

[0061] The embodiment of the present application provides an AC output overlap device for multiple inverters. Since it is possible to first determine whether the voltage value of the DC power output by multiple photovoltaic panels connected to the multiple inverters is less than a preset voltage value, and when the voltage value of the DC power output by a certain photovoltaic panel is less than the preset voltage value, an adjustment wave is output to other inverters, that is, a modulation wave is output only to the inverter whose DC power output voltage value of the corresponding photovoltaic panel is greater than or equal to the preset voltage value. Therefore, overmodulation can be avoided when the DC power output by other inverters is converted into AC power, thereby avoiding waveform distortion after the AC power output of other inverters is overlapped.

[0062] The AC output overlap device of multiple inverters in the embodiment of the present application can be a device, or a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. For example, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an ultra-mobile personal computer (UMPC) or a netbook, etc., and the non-mobile electronic device can be a server, a personal computer (PC), etc., which is not specifically limited in the embodiment of the present application.

[0063] The AC output overlap device of multiple inverters in the embodiment of the present application can be a device with an operating system. The operating system can be a Windows operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0064] The AC power output overlap device of multiple inverters provided in the embodiment of the present application can achieve Figures 1 to 4 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0065] Optional, such as Figure 6 As shown, an embodiment of the present application also provides an electronic device 60, including a processor 62, a memory 61, and a program or instruction stored in the memory 61 and executable on the processor 62. When the program or instruction is executed by the processor 62, each process of the above-mentioned AC power output overlap method embodiment of multiple inverters is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0066] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0067] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned AC power output overlap method embodiment of multiple inverters is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0068] The processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0069] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned AC power output overlap method embodiment of multiple inverters, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0070] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0071] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0072] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0073] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for overlapping the AC outputs of multiple inverters, characterized in that: The method comprises: Determine a first voltage value of direct current output by a photovoltaic panel connected to each of the plurality of inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; When a target voltage value among the plurality of first voltage values ​​is less than a preset voltage value, outputting a modulated wave to other inverters, wherein the modulated wave is used to adjust the alternating current outputted by the photovoltaic wave corresponding to the other inverters; The other inverters are the inverters among the multiple inverters except the inverter corresponding to the target voltage value.

2. The method according to claim 1, characterized in that: After outputting the modulation wave to the other inverters, the method further includes: The output end of the inverter corresponding to the target voltage value is controlled to be in a disconnected state.

3. The method according to claim 1, characterized in that After outputting the modulation wave to the other inverters, the method further includes: Obtaining a first harmonic distortion parameter corresponding to the voltage of the alternating current output by the other inverters; When the parameter value of the first harmonic distortion parameter is greater than a preset threshold, the output end of the first inverter among the other inverters is controlled to be in a disconnected state.

4. The method according to claim 3, characterized in that After controlling the output end of the first inverter among the other inverters to be in a disconnected state, the method further includes: Obtaining a second harmonic distortion parameter corresponding to the voltage of the alternating current output by a second inverter; the second inverter is the inverter among the other inverters except the first inverter; When the parameter value of the second harmonic distortion parameter is greater than the preset threshold, the output end of the third inverter in the second inverter is controlled to be in a disconnected state.

5. An AC power output overlap device for multiple inverters, characterized in that: The AC output coincidence device of the plurality of inverters comprises: a determination module and an output module; The determination module is used to determine a first voltage value of direct current output by a photovoltaic panel connected to each of the multiple inverters; each of the first voltage values ​​corresponds to a photovoltaic panel; The output module is used to output a modulation wave to other inverters when the target voltage value among the multiple first voltage values ​​determined by the determination module is less than a preset voltage value, and the modulation wave is used to adjust the alternating current output by the photovoltaic wave corresponding to the other inverters; The other inverters are the inverters among the multiple inverters except the inverter corresponding to the target voltage value.

6. The AC power output overlap device for multiple inverters according to claim 5, characterized in that: The AC power output coincidence device of the plurality of inverters further comprises: a control module; The control module is used to control the output end of the inverter corresponding to the target voltage value to be in a disconnected state.

7. The AC power output overlap device for multiple inverters according to claim 5, characterized in that: The AC power output coincidence device of the plurality of inverters further comprises: an acquisition module and a control module; The acquisition module is used to acquire the first harmonic distortion parameter corresponding to the voltage of the alternating current output by the other inverters; The control module is used to control the output end of the first inverter in the other inverters to be in a disconnected state when the parameter value of the first harmonic distortion parameter acquired by the acquisition module is greater than a preset threshold.

8. The AC power output overlap device for multiple inverters according to claim 7, characterized in that: The acquisition module is further used to acquire a second harmonic distortion parameter corresponding to the voltage of the alternating current output by a second inverter; the second inverter is the inverter other than the first inverter among the other inverters; The control module is further configured to control the output end of the third inverter in the second inverter to be in a disconnected state when the parameter value of the second harmonic distortion parameter acquired by the acquisition module is greater than the preset threshold.

9. An electronic device, characterized in that: The method comprises a processor, a memory and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method for overlapping the AC outputs of multiple inverters as described in any one of claims 1 to 4.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the method for overlapping the AC outputs of multiple inverters as described in any one of claims 1 to 5 are implemented.

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