Breaking control method of photovoltaic inverter, electronic equipment and photovoltaic inverter

Abstract

The invention provides a breaking control method of a photovoltaic inverter, electronic equipment and the photovoltaic inverter, and belongs to the field of photovoltaic technologies. The photovoltaic inverter comprises an auxiliary switch, at least two DC conversion modules and at least one breaking switch. Each breaking switch corresponds to at least one direct-current conversion module, the direct-current conversion module is connected with the corresponding photovoltaic module through the corresponding breaking switch, and each direct-current conversion module corresponds to at least two photovoltaic modules; the first end of the auxiliary switch is connected with one direct current conversion module, and the second end of the auxiliary switch is connected with one photovoltaic module corresponding to the direct current conversion module; the method comprises the steps of controlling the auxiliary switch to be closed; and if the photovoltaic inverter works normally after the auxiliary switch is switched on, the auxiliary switch is controlled to be switched off, and the breaking switch is controlled to be switched on. According to the invention, damage and even explosion caused by access of a large number of photovoltaic modules under the condition that the photovoltaic inverter has a fault can be avoided, and the condition that other equipment is influenced can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular, to a breaking control method, an electronic device, and a photovoltaic inverter for a photovoltaic inverter. Background Art

[0002] In a photovoltaic power generation system, both photovoltaic modules and photovoltaic inverters are key devices. The photovoltaic modules can convert solar energy into direct current, and the photovoltaic inverter can perform a series of conversion processes on the direct current output by the photovoltaic modules to meet specific requirements of the load or the power grid for electric energy.

[0003] In an actual photovoltaic energy application scenario, the photovoltaic inverter needs to go through the transportation process to reach the final working site. During this transportation process, due to the complexity of the transportation environment, various factors such as the bumps and vibrations of the transportation vehicle, improper operations during handling, and extreme temperature or humidity environments that may be encountered during transportation may cause the electronic components inside the photovoltaic inverter to become loose, the circuit lines to be damaged, or the circuit board to have potential faults.

[0004] When the photovoltaic inverter reaches the working site, if, without knowing it, the photovoltaic inverter that has malfunctioned during transportation is rashly connected to a large number of photovoltaic modules and attempts to operate in parallel, it is very likely to cause damage to the internal components of the photovoltaic inverter, resulting in complete damage to the photovoltaic inverter. In a more serious case, it may cause the photovoltaic inverter to explode. Once an explosion accident occurs, the strong impact and electrical interference generated are very likely to affect other devices associated with it around. Summary of the Invention

[0005] Embodiments of the present invention provide a breaking control method, an electronic device, and a photovoltaic inverter for a photovoltaic inverter to solve the problem in the prior art that connecting a malfunctioned photovoltaic inverter to a large number of photovoltaic modules may cause damage to the photovoltaic inverter, or even explosion, affecting associated devices.

[0006] In a first aspect, embodiments of the present invention provide a breaking control method for a photovoltaic inverter. The photovoltaic inverter includes an auxiliary switch, at least two DC conversion modules, and at least one breaking switch; each of the breaking switches corresponds to at least one of the DC conversion modules, and the DC conversion module is connected to a corresponding photovoltaic module through the corresponding breaking switch. Each of the DC conversion modules corresponds to at least two photovoltaic modules; a first end of the auxiliary switch is connected to one of the DC conversion modules, and a second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module. The breaking control method for the photovoltaic inverter includes:

[0007] Controlling the auxiliary switch to close;

[0008] If the PV inverter operates normally after the auxiliary switch is closed, control the auxiliary switch to open and control the disconnection switch to close.

[0009] In a possible implementation, the disconnection control method of the PV inverter further includes:

[0010] If it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and other DC conversion modules are not in the enabled state, control the current of the DC conversion module connected to the auxiliary switch to remain in a state less than or equal to a first preset current; the first preset current is less than the rated current of the DC conversion module.

[0011] In a possible implementation, before the step of if it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and other DC conversion modules are not in the enabled state, control the current of the DC conversion module connected to the auxiliary switch to remain in a state less than or equal to a first preset current, it further includes:

[0012] Obtain the voltages of each DC conversion module;

[0013] For each DC conversion module, if the voltage of the DC conversion module is greater than or equal to a preset voltage, determine that the DC conversion module is in the enabled state; otherwise, determine that the DC conversion module is not in the enabled state.

[0014] In a possible implementation, after the step of controlling the disconnection switch to close, it further includes:

[0015] For each disconnection switch, if a disconnection signal of the disconnection switch is detected and it is detected that the DC conversion module corresponding to the disconnection switch is still in the enabled state at the falling edge of the disconnection signal, perform a disconnection switch fault warning.

[0016] In a possible implementation, the DC conversion module is connected to the corresponding PV module through the corresponding disconnection switch;

[0017] The disconnection switch includes at least two of a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; the PV module includes at least two of a first PV component, a second PV component, a third PV component, a fourth PV component, and a fifth PV component;

[0018] The first pole of the first photovoltaic module and the first pole of the second photovoltaic module are both connected to the corresponding DC conversion module through a first switch; the first poles of the third photovoltaic module, the fourth photovoltaic module, and the fifth photovoltaic module are all connected to the corresponding DC conversion module through a second switch; the second pole of the first photovoltaic module is connected to the corresponding DC conversion module through a third switch; the second poles of the second photovoltaic module and the third photovoltaic module are both connected to the corresponding DC conversion module through a fourth switch; the second poles of the fourth photovoltaic module and the fifth photovoltaic module are both connected to the corresponding DC conversion module through a fifth switch;

[0019] The first pole of each photovoltaic module is the positive pole, and the second pole of each photovoltaic module is the negative pole; alternatively, the first pole of each photovoltaic module is the negative pole, and the second pole of each photovoltaic module is the positive pole.

[0020] In a possible implementation manner, after controlling the auxiliary switch to close, it further includes:

[0021] If the current in the branch where the auxiliary switch is located is greater than or equal to a second preset current, and / or the duration for which the auxiliary switch is closed is greater than or equal to a preset duration, then control the auxiliary switch to open.

[0022] In a possible implementation manner, after controlling the auxiliary switch to close, it further includes:

[0023] If the current in other branches is greater than or equal to a third preset current, then control the auxiliary switch to open; the other branches are the branches other than the branch where the auxiliary switch is located.

[0024] In a possible implementation manner, the impedance of the branch where the auxiliary switch is located is greater than the impedance of other branches.

[0025] In a second aspect, an embodiment of the present invention provides a breaking control device for a photovoltaic inverter. The photovoltaic inverter includes an auxiliary switch, at least two DC conversion modules, and at least one breaking switch; each of the breaking switches corresponds to at least one of the DC conversion modules, and the DC conversion module is connected to the corresponding photovoltaic module through the corresponding breaking switch, and each of the DC conversion modules corresponds to at least two of the photovoltaic modules; a first end of the auxiliary switch is connected to one of the DC conversion modules, and a second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module; the breaking control device for the photovoltaic inverter includes:

[0026] A first control module, configured to control the auxiliary switch to close;

[0027] A second control module, configured to control the auxiliary switch to open and control the disconnecting switch to close if the PV inverter operates normally after the auxiliary switch is closed.

[0028] In a third aspect, an embodiment of the present invention provides an electronic device, including a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the disconnecting control method of the PV inverter according to the first aspect or any possible implementation manner of the first aspect described above.

[0029] In a fourth aspect, an embodiment of the present invention provides a PV inverter, including an auxiliary switch, at least two DC conversion modules, at least one disconnecting switch, and the electronic device according to the third aspect; the auxiliary switch, the disconnecting switch, and the DC conversion module are controlled by the electronic device;

[0030] Each disconnecting switch corresponds to at least one DC conversion module. The DC conversion module is connected to a corresponding PV module through the corresponding disconnecting switch, and each DC conversion module corresponds to at least two PV modules; a first end of the auxiliary switch is connected to one of the DC conversion modules, and a second end of the auxiliary switch is connected to one of the PV modules corresponding to the DC conversion module.

[0031] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the disconnecting control method of the PV inverter according to the first aspect or any possible implementation manner of the first aspect described above are implemented.

[0032] An embodiment of the present invention provides a disconnecting control method, an electronic device, and a PV inverter for a PV inverter. The PV inverter includes not only a disconnecting switch but also an auxiliary switch. The disconnecting switch is used to control whether a large number of PV modules are connected, while the auxiliary switch is only used to control whether one path of PV modules is connected. The method first controls the auxiliary switch to close. At this time, all disconnecting switches are in the open state, and the PV inverter only connects one path of PV modules. Even if the PV inverter fails, it will not cause significant damage; after the auxiliary switch is closed, if the PV inverter can operate normally, it means that the PV inverter has not failed or been damaged. Therefore, the auxiliary switch can be controlled to open and the disconnecting switch can be controlled to close, so that the PV inverter connects a large number of PV modules and operates normally, which can avoid damage or even explosion of the PV inverter caused by connecting a large number of PV modules in the case of a fault, affecting other devices. Description of the Drawings

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 is a schematic structural diagram of a photovoltaic inverter provided by an embodiment of the present invention;

[0035] Figure 2 is a flowchart showing the implementation of the disconnection control method for a photovoltaic inverter provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of a photovoltaic inverter provided by another embodiment of the present invention;

[0037] Figure 4 is a schematic structural diagram of a photovoltaic inverter provided by still another embodiment of the present invention;

[0038] Figure 5 is a schematic diagram of a disconnection control device for a photovoltaic inverter provided by an embodiment of the present invention;

[0039] Figure 6 is a schematic diagram of an electronic device provided by an embodiment of the present invention. Detailed Embodiments

[0040] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will be described through specific embodiments in conjunction with the drawings.

[0042] Refer to Figure 1 which shows a schematic structural diagram of a photovoltaic inverter provided by an embodiment of the present invention. Refer to Figure 1, the photovoltaic inverter includes an auxiliary switch 11, at least two DC conversion modules 12, and at least one disconnect switch 13; each disconnect switch 13 corresponds to at least one DC conversion module 12, and the DC conversion module 12 is connected to the corresponding photovoltaic module PV through the corresponding disconnect switch 13, and each DC conversion module 12 corresponds to at least two photovoltaic modules PV; the first end of the auxiliary switch 11 is connected to one of the DC conversion modules 12, and the second end of the auxiliary switch 11 is connected to one of the photovoltaic modules PV corresponding to this DC conversion module 12.

[0043] See Figure 1 , each DC conversion module 12 may correspond to at least two photovoltaic modules PV, but the specific value of the photovoltaic modules PV corresponding to each DC conversion module 12 is not specifically limited. The input end of the DC conversion module 12 is connected to the photovoltaic module PV corresponding to this DC conversion module 12 through the corresponding disconnect switch 13. Exemplarily, each DC conversion module 12 may correspond to 5 photovoltaic modules PV or 10 photovoltaic modules PV, and so on.

[0044] Among them, each disconnect switch 13 corresponds to at least one DC conversion module 12, that is, the input ends of at least one DC conversion module 12 are connected to the corresponding photovoltaic module PV through the same disconnect switch 13, but the specific value of the DC conversion modules 12 corresponding to each disconnect switch 13 is not specifically limited. Exemplarily, each disconnect switch 13 corresponds to one DC conversion module 12, each disconnect switch 13 corresponds to two DC conversion modules 12, or each disconnect switch 13 corresponds to three DC conversion modules 12, and so on. Figure 1 An example in which each disconnect switch 13 corresponds to two DC conversion modules 12 is given.

[0045] The photovoltaic inverter further includes an auxiliary switch 11. The auxiliary switch 11 is used to connect the input end of one of the DC conversion modules 12 and one of the photovoltaic modules PV corresponding to this DC conversion module 12. Among them, this one DC conversion module 12 may be any DC conversion module 12 of the photovoltaic inverter, and this one photovoltaic module PV may be any photovoltaic module PV corresponding to this one DC conversion module 12. Exemplarily, Figure 1 It shows that the auxiliary switch 11 is connected to the input end of the topmost DC conversion module 12 and is connected to the topmost photovoltaic module PV of this DC conversion module 12.

[0046] See Figure 1 , the output end of each DC conversion module 12 is connected to the DC bus. The DC conversion module 12 is used for DC-DC conversion, for example, boosting or bucking, etc. Further, the DC conversion module 12 may be a DC-DC conversion module for realizing the MPPT function.

[0047] The DC bus is also connected to the inverter module 14. The inverter module 14 is used to convert direct current into alternating current for grid connection or power supply to loads, etc.

[0048] It should be noted that the embodiments of the present application do not specifically limit the number of DC conversion modules 12 included in the photovoltaic inverter, the number of photovoltaic modules PV corresponding to each DC conversion module 12, and the number of DC conversion modules 12 corresponding to each disconnection switch 13. The number of photovoltaic modules PV corresponding to different DC conversion modules 12 may be the same or different, and no specific limitation is made here. The number of DC conversion modules 12 corresponding to different disconnection switches 13 may be the same or different. The preferred mode is that the number of photovoltaic modules PV corresponding to each DC conversion module 12 is the same, and the number of DC conversion modules 12 corresponding to each disconnection switch 13 is also the same. For example, each DC conversion module 12 corresponds to 5 photovoltaic modules PV, and each disconnection switch 13 corresponds to 2 DC conversion modules 12, etc.

[0049] Corresponding to the above photovoltaic inverter, the embodiments of the present application provide a disconnection control method for a photovoltaic inverter.

[0050] See Figure 2 , which shows the implementation flowchart of the disconnection control method for the photovoltaic inverter provided by the embodiments of the present invention. The execution subject of the disconnection control method for the photovoltaic inverter is an electronic device. This electronic device may be a controller, such as a DSP (Digital Signal Processor) and other controllers.

[0051] As described above, the photovoltaic inverter includes an auxiliary switch, at least two DC conversion modules, and at least one disconnection switch; each disconnection switch corresponds to at least one DC conversion module, the DC conversion module is connected to the corresponding photovoltaic module through the corresponding disconnection switch, and each DC conversion module corresponds to at least two photovoltaic modules; the first end of the auxiliary switch is connected to one of the DC conversion modules, and the second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module.

[0052] The disconnection control method for the above photovoltaic inverter is described in detail as follows:

[0053] In S201, control the auxiliary switch to close.

[0054] In the embodiment of the present application, before controlling the photovoltaic inverter to start working, such as when powered on for the first time, the auxiliary switch is first controlled to close, and all disconnect switches of the photovoltaic inverter are controlled to remain in the disconnected state. At this time, only one photovoltaic module connected to the auxiliary switch is connected to the photovoltaic inverter, and a large number of photovoltaic modules will not be connected at one time. A small current is first allowed to flow into the photovoltaic inverter to detect whether the photovoltaic inverter can work normally. Since the current flowing into the photovoltaic inverter is small, even if the photovoltaic inverter fails due to transportation or other reasons, a large accident will not occur when the photovoltaic inverter is powered on with a small current, and the machine will not explode and cause a fire.

[0055] The embodiment of the present application does not impose any specific restrictions on the specific implementation method of detecting whether the photovoltaic inverter can work normally after the auxiliary switch is closed, and any implementable method is acceptable. For example, it is possible to detect whether the output parameters of the photovoltaic inverter are within a preset normal parameter range, etc.

[0056] The auxiliary switch may be an intelligent switch that can be controlled by an electronic device, or it may be manually controlled to be closed or opened, and no specific limitation is made here.

[0057] In S202, if the photovoltaic inverter works normally after the auxiliary switch is closed, the auxiliary switch is controlled to be opened, and the disconnector is controlled to be opened and closed.

[0058] If it is detected that the photovoltaic inverter can work normally after the auxiliary switch is controlled to be closed, the auxiliary switch can be controlled to be opened, and then all the disconnectors of the photovoltaic inverter can be controlled to be opened and closed. Since it has been determined in advance that the photovoltaic inverter can work normally and no fault has occurred, all the disconnectors can be controlled to be opened and closed so that the photovoltaic components connected to each DC conversion module through the disconnector are all connected to the photovoltaic inverter.

[0059] The reason why the present application first controls the auxiliary switch to be disconnected and then controls the disconnect switch to be opened and closed after determining that the photovoltaic inverter can work normally is that if the disconnect switch is controlled to be opened and closed first and then the auxiliary switch is controlled to be disconnected, then when the disconnect switch is opened and closed and the auxiliary switch has not yet been disconnected, a large current may flow into the auxiliary switch, which may cause overcurrent in the branch where the auxiliary switch is located and even damage the auxiliary switch. Therefore, it is necessary to first disconnect the auxiliary switch and then close the disconnect switch.

[0060] In some possible implementations, if it is detected that the photovoltaic inverter fails to work normally after the auxiliary switch is closed, an alarm may be sounded to prompt a staff member to perform maintenance.

[0061] The photovoltaic inverter provided by the embodiment of the present application not only includes a disconnecting switch but also an auxiliary switch. The disconnecting switch is used to control whether a large number of photovoltaic modules are connected, while the auxiliary switch is only used to control whether one of the photovoltaic modules is connected. The method first controls the auxiliary switch to close. At this time, all the disconnecting switches are in the open state, and the photovoltaic inverter only connects one of the photovoltaic modules. Even if the photovoltaic inverter fails, it will not cause significant damage. After the auxiliary switch is closed, if the photovoltaic inverter can work normally, it means that the photovoltaic inverter has not failed or been damaged. Therefore, the auxiliary switch can be controlled to open, and the disconnecting switch can be controlled to close, so that the photovoltaic inverter connects a large number of photovoltaic modules and works normally, which can avoid the damage or even explosion of the photovoltaic inverter caused by connecting a large number of photovoltaic modules in the case of a fault, and affecting other devices.

[0062] In some embodiments, the disconnecting control method of the photovoltaic inverter further includes:

[0063] If it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and all other DC conversion modules are not in the enabled state, then control the current of the DC conversion module connected to the auxiliary switch to remain in a state less than or equal to a first preset current; the first preset current is less than the rated current of the DC conversion module.

[0064] Wherein, the other DC conversion modules are all the DC conversion modules in the photovoltaic inverter except the DC conversion module connected to the auxiliary switch.

[0065] The enabled state can be understood as the powered-on state or the normal working state, etc.

[0066] In the embodiment of the present application, each disconnecting switch can correspond to at least two DC conversion modules, that is, at least two DC conversion modules are connected to the corresponding photovoltaic modules through the same disconnecting switch. In this application scenario, if it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and all other DC conversion modules are not in the enabled state, it can be explained that only the auxiliary switch is in the closed state and all the disconnecting switches are in the open state. Because if a certain disconnecting switch is in the closed state, at least two DC conversion modules are in the enabled state, and now only the DC conversion module connected to the auxiliary switch is in the enabled state, indicating that only the auxiliary switch is closed. At this time, in order to avoid damage to the line or the auxiliary switch due to excessive current in the branch where the auxiliary switch is located, the current of the DC conversion module connected to the auxiliary switch can be controlled to remain in a state less than or equal to the first preset current.

[0067] Wherein, the first preset current is less than the rated current of the DC conversion module.

[0068] Exemplarily, the first preset current can be the maximum current that the branch where the auxiliary switch is located can withstand.

[0069] The first preset current has a negative correlation with the number of photovoltaic modules corresponding to a single DC conversion module. The first preset current can be a target current value obtained by dividing the rated current of the DC conversion module by the number of photovoltaic modules corresponding to a single DC conversion module; the first preset current can also be a current value obtained by subtracting a current difference from the target current value, and so on. For example, the first preset current can be 0.1 times the rated current of the DC conversion module.

[0070] When controlling the current of the DC conversion module, the input current of the DC conversion module can be affected by controlling the output-related parameters of the DC conversion module, so that its input current does not exceed the maximum current that the branch where the auxiliary switch is located can withstand. For example, its input current is made less than or equal to the first preset current; the input current of the DC conversion module can also be directly controlled so that its input current does not exceed the maximum current that the branch where the auxiliary switch is located can withstand. For example, its input current is made less than or equal to the first preset current. The specific control method is not specifically limited, and any control method in the related art that can achieve this function is applicable.

[0071] In some embodiments, before controlling the current of the DC conversion module connected to the auxiliary switch to be maintained in a state less than or equal to the first preset current if it is detected that the DC conversion module connected to the auxiliary switch is in an enabled state and other DC conversion modules are not in an enabled state, it further includes:

[0072] Obtain the voltages of each DC conversion module;

[0073] For each DC conversion module, if the voltage of the DC conversion module is greater than or equal to the preset voltage, determine that the DC conversion module is in an enabled state; otherwise, determine that the DC conversion module is not in an enabled state.

[0074] In the embodiments of the present application, it is possible to determine whether the corresponding DC conversion module is in an enabled state according to the voltages of each DC conversion module. When the voltage of a certain DC conversion module is greater than or equal to the preset voltage, it is determined that the DC conversion module is in an enabled state; otherwise, it is determined that the DC conversion module is not in an enabled state.

[0075] Among them, the preset voltage can be the voltage value of the DC conversion module connected to the auxiliary switch detected when only the auxiliary switch is closed and the disconnect switches are all open, or it can be slightly less than this voltage value, and so on. The value of the preset voltage can be determined according to actual needs and is not specifically limited here.

[0076] The voltage of the above-mentioned DC conversion module can be its output voltage or its input voltage, which is not specifically limited here.

[0077] In some embodiments, after controlling the closing of the disconnection switch, the following steps are further included:

[0078] For each disconnection switch, if a disconnection signal of the disconnection switch is detected and it is detected that the DC conversion module corresponding to the disconnection switch is still in an enabled state at the falling edge of the disconnection signal, a disconnection switch fault alarm is generated.

[0079] When the input voltage of a certain DC conversion module is too high and greater than the preset input voltage, or when the temperature of a certain DC conversion module is too high and greater than the preset temperature, or when a certain DC conversion module is in other abnormal states, it is necessary to control the disconnection switch corresponding to the DC conversion module to disconnect at this time, so that the DC conversion module stops working and avoids the aggravation of its abnormal state.

[0080] When controlling the disconnection of a certain disconnection switch, a disconnection signal of the disconnection switch will be generated, usually a high-level signal, with a high-level signal having a rising edge and a falling edge. When the disconnection switch receives the disconnection signal, that is, when it receives the high-level signal, it will automatically disconnect. If it is still detected that the DC conversion module corresponding to the disconnection switch is in an enabled state at the falling edge of the disconnection signal, it means that the disconnection switch has not automatically disconnected and a fault has occurred. At this time, a disconnection switch fault alarm needs to be generated to prompt the staff to disconnect the disconnection switch in a certain way and perform maintenance or replacement on the disconnection switch, so as to avoid the aggravation of the abnormal state of the corresponding DC conversion module due to the disconnection switch fault, and even the occurrence of situations such as converter explosion and fire.

[0081] In the related art, the positive poles of the photovoltaic modules corresponding to the same DC conversion module are all connected to the DC conversion module through the same switch inside the disconnection switch corresponding to the DC conversion module, and the negative poles of the photovoltaic modules corresponding to the same DC conversion module are all connected to the DC conversion module through the same switch inside the disconnection switch corresponding to the DC conversion module. In this connection method, if the positive and negative terminals of a certain photovoltaic module are reversely connected, even when the disconnection switch is disconnected, there will still be currents in other branches flowing into the reversely connected branch, which may cause overcurrent in this branch, resulting in device damage and even possible fire. To solve this problem, the embodiments of the present application provide a new connection method.

[0082] In some embodiments, referring to Figure 3 and Figure 4 , the DC conversion module 12 is connected to the corresponding photovoltaic module through the corresponding disconnection switch 13;

[0083] The disconnect switch 13 includes at least two of a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5; the photovoltaic module includes at least two of a first photovoltaic component PV1, a second photovoltaic component PV2, a third photovoltaic component PV3, a fourth photovoltaic component PV4, and a fifth photovoltaic component PV5;

[0084] The first pole of the first photovoltaic component PV1 and the first pole of the second photovoltaic component PV2 are both connected to the corresponding DC conversion module 12 through the first switch K1; the first poles of the third photovoltaic component PV3, the fourth photovoltaic component PV4, and the fifth photovoltaic component PV5 are all connected to the corresponding DC conversion module 12 through the second switch K2; the second pole of the first photovoltaic component PV1 is connected to the corresponding DC conversion module 12 through the third switch K3; the second poles of the second photovoltaic component PV2 and the third photovoltaic component PV3 are both connected to the corresponding DC conversion module 12 through the fourth switch K4; the second poles of the fourth photovoltaic component PV4 and the fifth photovoltaic component PV5 are both connected to the corresponding DC conversion module 12 through the fifth switch K5;

[0085] The first pole of each photovoltaic component is the positive pole, and the second pole of each photovoltaic component is the negative pole; alternatively, the first pole of each photovoltaic component is the negative pole, and the second pole of each photovoltaic component is the positive pole.

[0086] The embodiments of the present application do not specifically limit the number of the first photovoltaic components PV1, the number of the second photovoltaic components PV2, the number of the third photovoltaic components PV3, the number of the fourth photovoltaic components PV4, and the number of the fifth photovoltaic components PV5 included in each photovoltaic module, as long as the number of photovoltaic components in each photovoltaic module is greater than or equal to two. The embodiments of the present application do not specifically limit the number of the first switch K1, the number of the second switch K2, the number of the third switch K3, the number of the fourth switch K4, and the number of the fifth switch K5 included in each disconnect switch 13, as long as the connection relationship between the above photovoltaic module and the DC conversion module 12 can be satisfied.

[0087] Exemplarily, assuming that the photovoltaic module includes two photovoltaic components, it may include one first photovoltaic component PV1 and one second photovoltaic component PV2. Correspondingly, the disconnect switch 13 may include one first switch K1, one third switch K3, and one fourth switch K4. For the connection relationship, refer to the foregoing description. The connection relationships of the photovoltaic components and switches not included are discarded, that is, the connection relationship only includes the connection relationship between one first photovoltaic component PV1 and one second photovoltaic component PV2 included in the photovoltaic module and one first switch K1, one third switch K3, and one fourth switch K4 included in the disconnect switch 13.

[0088] Assume that the photovoltaic module includes three photovoltaic components, then it may include a first photovoltaic component PV1, a second photovoltaic component PV2, and a third photovoltaic component PV3. Correspondingly, the disconnect switch 13 may include a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4. For the connection relationship, refer to the foregoing description. Discard the connection relationships of the photovoltaic components and switches not included.

[0089] Assume that the photovoltaic module includes four photovoltaic components, then it may include a first photovoltaic component PV1, a second photovoltaic component PV2, a third photovoltaic component PV3, and a fourth photovoltaic component PV4. Correspondingly, the disconnect switch 13 may include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5. For the connection relationship, refer to the foregoing description. Discard the connection relationships of the photovoltaic components and switches not included.

[0090] Assume that the photovoltaic module includes five photovoltaic components, then it may include a first photovoltaic component PV1, a second photovoltaic component PV2, a third photovoltaic component PV3, a fourth photovoltaic component PV4, and a fifth photovoltaic component PV5. Correspondingly, the disconnect switch 13 may include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5. For the connection relationship, refer to the foregoing description.

[0091] Assume that the photovoltaic module includes six photovoltaic components, then it may include two first photovoltaic components PV1, a second photovoltaic component PV2, a third photovoltaic component PV3, a fourth photovoltaic component PV4, and a fifth photovoltaic component PV5. Correspondingly, the disconnect switch 13 may include two first switches K1, a second switch K2, two third switches K3, a fourth switch K4, and a fifth switch K5. Among them, for the connection relationship between the five photovoltaic components and the five switches, refer to the foregoing description. For the connection relationship of the newly added one first photovoltaic component PV1, one first switch K1, and one third switch K3, it can also refer to the foregoing description, that is, the first pole of the first photovoltaic component PV1 is connected to the corresponding DC conversion module 12 through the first switch K1, and the second pole of the first photovoltaic component PV1 is connected to the corresponding DC conversion module 12 through the third switch K3.

[0092] When adding one more photovoltaic component, a second photovoltaic component PV2 can be added, and the corresponding disconnect switch 13 can change adaptively; if one more photovoltaic component needs to be added on this basis, then add one more third photovoltaic component PV3, and so on, which will not be elaborated here.

[0093] It should be noted that the above is only an example of a photovoltaic module including different numbers of photovoltaic components. The photovoltaic module can also include other combinations, which are not specifically limited here. For example, assuming that the photovoltaic module includes two photovoltaic components, in addition to including a first photovoltaic component PV1 and a second photovoltaic component PV2, it can also include a third photovoltaic component PV3 and a fourth photovoltaic component PV4, include a fourth photovoltaic component PV4 and a fifth photovoltaic component PV5, include two first photovoltaic components PV1, or include two second photovoltaic components PV2, and so on. When the combination of photovoltaic components included in the photovoltaic module changes, the types and quantities of the switches included in the corresponding disconnection switch also change accordingly, which can be determined according to the aforementioned connection relationship and will not be elaborated here.

[0094] Based on the above description, the above photovoltaic module can include at least one of the first photovoltaic component PV1, the second photovoltaic component PV2, the third photovoltaic component PV3, the fourth photovoltaic component PV4, and the fifth photovoltaic component PV5, but the quantity of each photovoltaic component is not specifically limited; correspondingly, the disconnection switch 13 includes at least one of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5, but the quantity of each switch is not specifically limited.

[0095] It should be noted that the types and quantities of the switches included in the disconnection switch 13 in the above example are for the case where each disconnection switch 13 corresponds to one DC conversion module 12. If each disconnection switch 13 corresponds to two DC conversion modules 12, the quantity of each type of switch included in the disconnection switch 13 needs to be doubled. If each disconnection switch 13 corresponds to three DC conversion modules 12, the quantity of each type of switch included in the disconnection switch 13 needs to be multiplied by three, and so on, which will not be elaborated here.

[0096] Figure 3 The structural schematic diagram of a photovoltaic inverter is given, where the photovoltaic module includes one each of the first photovoltaic component PV1, the second photovoltaic component PV2, the third photovoltaic component PV3, the fourth photovoltaic component PV4, and the fifth photovoltaic component PV5, the disconnection switch 13 includes two each of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 (that is, the disconnection switch 13 corresponds to two DC conversion modules 12), the first pole is the positive pole, and the second pole is the negative pole.

[0097] Specifically, the positive electrodes of the first photovoltaic module PV1 and the second photovoltaic module PV2 are both connected to the corresponding DC conversion module 12 through the corresponding first switch K1; the positive electrodes of the third photovoltaic module PV3, the fourth photovoltaic module PV4, and the fifth photovoltaic module PV5 are all connected to the corresponding DC conversion module 12 through the corresponding second switch K2; the negative electrode of the first photovoltaic module PV1 is connected to the corresponding DC conversion module 12 through the corresponding third switch K3; the negative electrodes of the second photovoltaic module PV2 and the third photovoltaic module PV3 are both connected to the corresponding DC conversion module 12 through the corresponding fourth switch K4; the negative electrodes of the fourth photovoltaic module PV4 and the fifth photovoltaic module PV5 are both connected to the corresponding DC conversion module 12 through the corresponding fifth switch K5.

[0098] Figure 4 The structural schematic diagram of a photovoltaic inverter is given, in which the photovoltaic module includes one each of the first photovoltaic module PV1, the second photovoltaic module PV2, the third photovoltaic module PV3, the fourth photovoltaic module PV4, and the fifth photovoltaic module PV5, the disconnect switch 13 includes two each of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 (i.e., the disconnect switch 13 corresponds to two DC conversion modules 12), the first pole is the negative pole, and the second pole is the positive pole.

[0099] Specifically, the negative electrodes of the first photovoltaic module PV1 and the second photovoltaic module PV2 are both connected to the corresponding DC conversion module 12 through the corresponding first switch K1; the negative electrodes of the third photovoltaic module PV3, the fourth photovoltaic module PV4, and the fifth photovoltaic module PV5 are all connected to the corresponding DC conversion module 12 through the corresponding second switch K2; the positive electrode of the first photovoltaic module PV1 is connected to the corresponding DC conversion module 12 through the corresponding third switch K3; the positive electrodes of the second photovoltaic module PV2 and the third photovoltaic module PV3 are both connected to the corresponding DC conversion module 12 through the corresponding fourth switch K4; the positive electrodes of the fourth photovoltaic module PV4 and the fifth photovoltaic module PV5 are both connected to the corresponding DC conversion module 12 through the corresponding fifth switch K5.

[0100] The connection relationship between the photovoltaic module, the disconnect switch 13, and the DC conversion module 12 provided in the embodiments of the present application makes there be no path between the various photovoltaic modules inside the photovoltaic module. Therefore, even if there is a situation where a certain photovoltaic module is connected with the positive and negative poles reversed, due to the absence of a path, it will not cause the current of other photovoltaic modules to be reversely injected into the branch where the photovoltaic module with the positive and negative poles reversed is located, and it is possible to avoid overcurrent in a certain branch, device damage, and even possible fire caused by the reverse connection of the positive and negative poles of the photovoltaic module.

[0101] In Figure 3 and Figure 4 ,"+" represents the positive electrode, and "-" represents the negative electrode.

[0102] See Figure 3 and Figure 4 Figure 4 , the auxiliary switch may include a sixth switch K6 and a seventh switch K7. The positive electrode of one photovoltaic module is connected to the corresponding DC conversion module 12 through the sixth switch K6, and the negative electrode of the photovoltaic module is connected to the corresponding DC conversion module 12 through the seventh switch K7. Among them, Figure 3 and Figure 4 the auxiliary switch in

[0103] The photovoltaic inverter may further include a first diode D1 and a second diode D2. The first diode D1 is connected in series with the sixth switch K6, and the second diode D2 is connected in series with the seventh switch K7. The conduction directions of the first diode D1 and the second diode D2 are opposite. The conduction direction of the first diode D1 is from the positive electrode of the photovoltaic module to the DC conversion module 12, and the conduction direction of the second diode D2 is from the DC conversion module 12 to the negative electrode of the photovoltaic module.

[0104] In some embodiments, after the above-mentioned control of the auxiliary switch is closed, it further includes:

[0105] If the current in the branch where the auxiliary switch is located is greater than or equal to a second preset current, and / or the duration of the auxiliary switch being closed is greater than or equal to a preset duration, then control the auxiliary switch to open.

[0106] The current in the branch where the auxiliary switch is located can be understood as the current flowing through the auxiliary switch.

[0107] After the auxiliary switch is closed, if it is not controlled to open for a long time, the current in the branch where the auxiliary switch is located may continue to increase. To a certain extent, it may burn out the auxiliary switch. Therefore, the auxiliary switch cannot be kept open for a long time. So, when it is detected that the duration of the auxiliary switch being closed is greater than or equal to the preset duration, it is necessary to control the auxiliary switch to open, or when it is detected that the current in the branch where the auxiliary switch is located is greater than or equal to the second preset current, it is necessary to control the auxiliary switch to open to avoid damage to the auxiliary switch.

[0108] Among them, the second preset current may be less than the maximum current that the auxiliary switch can withstand. For example, it may be slightly less than the maximum current. The preset duration is less than the maximum duration that the auxiliary switch can be closed, and it can be determined according to experience or experiments. The specific values of both can be determined according to actual needs and are not specifically limited here.

[0109] In some embodiments, after the above-mentioned control of the auxiliary switch is closed, it further includes:

[0110] If the current in other branches is greater than or equal to the third preset current, control the auxiliary switch to disconnect; other branches refer to the branches other than the branch where the auxiliary switch is located.

[0111] The above-mentioned other branches refer to the branches where the respective photovoltaic modules corresponding to each DC conversion module are located, excluding the branch where the auxiliary switch is located.

[0112] After the auxiliary switch is closed, if the current in other branches is greater than or equal to the third preset current, it indicates that there is also current in other branches, that is, the disconnecting switch corresponding to the DC conversion module connected by the auxiliary switch is in the closed state, that is, the disconnecting switch is closed without disconnecting the auxiliary switch. At this time, in order to avoid excessive current in the auxiliary switch and causing it to burn out, it is necessary to control the auxiliary switch to disconnect.

[0113] In some embodiments, the impedance of the branch where the auxiliary switch is located is greater than the impedance of other branches.

[0114] In order to avoid excessive current in the branch where the auxiliary switch is located and causing damage to the auxiliary switch, the embodiment of the present application sets the impedance of the branch where the auxiliary switch is located to be greater than the impedance of other branches. For example, the line length of the branch where the auxiliary switch is located is greater than the line lengths of other branches, or resistors, inductors, etc. are added to the branch where the auxiliary switch is located to increase its impedance. Through this setting, when the auxiliary switch and the disconnecting switch are closed at the same time, the current flowing through the branch where the auxiliary switch is located is less than the current in other branches. To a certain extent, the reliability of the auxiliary switch can be improved and the possibility of its damage can be reduced.

[0115] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0116] Figure 5 The structural schematic diagram of the disconnecting control device of the photovoltaic inverter provided by the embodiment of the present invention is shown. For the sake of convenience of description, only the parts related to the embodiment of the present invention are shown and are described in detail as follows:

[0117] The photovoltaic inverter includes an auxiliary switch, at least two DC conversion modules and at least one disconnecting switch; each disconnecting switch corresponds to at least one DC conversion module, and the DC conversion module is connected to the corresponding photovoltaic module through the corresponding disconnecting switch, and each DC conversion module corresponds to at least two photovoltaic modules; the first end of the auxiliary switch is connected to one of the DC conversion modules, and the second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module; as Figure 5 shown, the disconnecting control device 30 of the photovoltaic inverter includes: a first control module 31 and a second control module 32.

[0118] The first control module 31 is used to control the auxiliary switch to close;

[0119] The second control module 32 is used to, if the PV inverter operates normally after the auxiliary switch closes, control the auxiliary switch to open and control the disconnect switch to close.

[0120] In a possible implementation manner, the first control module 31 is further used to:

[0121] If it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and other DC conversion modules are not in the enabled state, control the current of the DC conversion module connected to the auxiliary switch to be maintained at a state less than or equal to a first preset current; the first preset current is less than the rated current of the DC conversion module.

[0122] In a possible implementation manner, the first control module 31 is further used to:

[0123] Before controlling the current of the DC conversion module connected to the auxiliary switch to be maintained at a state less than or equal to the first preset current if it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and other DC conversion modules are not in the enabled state, obtain the voltages of each DC conversion module;

[0124] For each DC conversion module, if the voltage of the DC conversion module is greater than or equal to a preset voltage, determine that the DC conversion module is in the enabled state; otherwise, determine that the DC conversion module is not in the enabled state.

[0125] In a possible implementation manner, the second control module 32 is further used to:

[0126] After controlling the disconnect switch to close, for each disconnect switch, if a disconnection signal of the disconnect switch is detected and it is detected that the DC conversion module corresponding to the disconnect switch is still in the enabled state at the falling edge of the disconnection signal, perform a disconnect switch fault warning.

[0127] In a possible implementation manner, the DC conversion module is connected to the corresponding PV module through the corresponding disconnect switch;

[0128] The disconnect switch includes at least two of a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; the PV module includes at least two of a first PV component, a second PV component, a third PV component, a fourth PV component, and a fifth PV component;

[0129] The first pole of the first photovoltaic module and the first pole of the second photovoltaic module are both connected to the corresponding DC conversion module through a first switch; the first poles of the third, fourth, and fifth photovoltaic modules are all connected to the corresponding DC conversion module through a second switch; the second pole of the first photovoltaic module is connected to the corresponding DC conversion module through a third switch; the second poles of the second and third photovoltaic modules are both connected to the corresponding DC conversion module through a fourth switch; the second poles of the fourth and fifth photovoltaic modules are both connected to the corresponding DC conversion module through a fifth switch;

[0130] The first pole of each photovoltaic module is the positive pole, and the second pole of each photovoltaic module is the negative pole; alternatively, the first pole of each photovoltaic module is the negative pole, and the second pole of each photovoltaic module is the positive pole.

[0131] In a possible implementation manner, the first control module 31 is further configured to:

[0132] After controlling the auxiliary switch to close, if the current in the branch where the auxiliary switch is located is greater than or equal to a second preset current, and / or the duration for which the auxiliary switch is closed is greater than or equal to a preset duration, then control the auxiliary switch to open.

[0133] In a possible implementation manner, the first control module 31 is further configured to:

[0134] After controlling the auxiliary switch to close, if the current in other branches is greater than or equal to a third preset current, then control the auxiliary switch to open; other branches are branches other than the branch where the auxiliary switch is located.

[0135] In a possible implementation manner, the impedance of the branch where the auxiliary switch is located is greater than the impedance of other branches.

[0136] Figure 6 is a schematic diagram of an electronic device provided by an embodiment of the present invention. As Figure 6 shown, the electronic device 4 of this embodiment includes: a processor 40 and a memory 41. The memory 41 is used to store a computer program 42, and the processor 40 is used to call and run the computer program 42 stored in the memory 41, and execute the steps in the embodiments of the above-mentioned breaking control method for each photovoltaic inverter, such as Figure 2 S201 to S202 shown. Alternatively, the processor 40 is used to call and run the computer program 42 stored in the memory 41 to implement the functions of each module / unit in the above-mentioned device embodiments, such as Figure 5 the functions of each module shown.

[0137] Exemplarily, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 42 in the electronic device 4. For example, the computer program 42 may be divided into Figure 5 each of the modules shown.

[0138] The electronic device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art can understand that Figure 6 merely being examples of the electronic device 4 does not constitute a limitation to the electronic device 4. It may include more or fewer components than shown in the figure, or combine certain components, or have different components. For example, the electronic device may further include input / output devices, network access devices, a bus, etc.

[0139] The processor 40 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0140] The memory 41 may be an internal storage unit of the electronic device 4, such as the hard disk or memory of the electronic device 4. The memory 41 may also be an external storage device of the electronic device 4, such as a plug-in hard disk equipped on the electronic device 4, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 41 may also include both the internal storage unit and the external storage device of the electronic device 4. The memory 41 is used to store the computer program and other programs and data required by the electronic device 4. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0141] Corresponding to the above electronic device, an embodiment of the present invention further provides a photovoltaic inverter, including an auxiliary switch, at least two DC conversion modules, at least one disconnecting switch, and the electronic device as described above; the auxiliary switch, the disconnecting switch, and the DC conversion module are controlled by the electronic device;

[0142] Each disconnecting switch corresponds to at least one DC conversion module, and the DC conversion module is connected to the corresponding photovoltaic module through the corresponding disconnecting switch. Each DC conversion module corresponds to at least two photovoltaic modules; the first end of the auxiliary switch is connected to one of the DC conversion modules, and the second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module.

[0143] For the related description of the photovoltaic inverter, reference can be made to the description in the foregoing embodiments, and details will not be repeated.

[0144] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of any one of the above-mentioned disconnecting control methods of the photovoltaic inverter are implemented.

[0145] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above-mentioned functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiments, and details will not be repeated here.

[0146] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the related descriptions of other embodiments.

[0147] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0148] In the embodiments provided by the present invention, it should be understood that the disclosed device / electronic device and method can be implemented in other ways. For example, the device / electronic device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms.

[0149] The unit described as a separate component may or may not be physically separated. The component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0150] In addition, each functional unit in the various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0151] When the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned embodiments of the disconnection control method for each photovoltaic inverter can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0152] The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A disconnection control method for a photovoltaic inverter, characterized in that, The photovoltaic inverter includes an auxiliary switch, at least two DC conversion modules, and at least one disconnecting switch; each of the disconnecting switches corresponds to at least one of the DC conversion modules, the DC conversion module is connected to the corresponding photovoltaic module through the corresponding disconnecting switch, and each of the DC conversion modules corresponds to at least two of the photovoltaic modules; the first end of the auxiliary switch is connected to one of the DC conversion modules, and the second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module; the disconnecting control method of the photovoltaic inverter includes: Control the auxiliary switch to close; If the photovoltaic inverter operates normally after the auxiliary switch is closed, control the auxiliary switch to open and control the disconnecting switch to close.

2. The breaking control method of the photovoltaic inverter according to claim 1, characterized in that, The disconnecting control method of the photovoltaic inverter further includes: If it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and other DC conversion modules are not in the enabled state, control the current of the DC conversion module connected to the auxiliary switch to remain in a state less than or equal to a first preset current; the first preset current is less than the rated current of the DC conversion module.

3. The disconnection control method of the photovoltaic inverter according to claim 2, wherein Before the step of if it is detected that the DC conversion module connected to the auxiliary switch is in the enabled state and other DC conversion modules are not in the enabled state, control the current of the DC conversion module connected to the auxiliary switch to remain in a state less than or equal to a first preset current, it further includes: Obtain the voltages of each DC conversion module; For each DC conversion module, if the voltage of the DC conversion module is greater than or equal to a preset voltage, determine that the DC conversion module is in the enabled state, otherwise, determine that the DC conversion module is not in the enabled state.

4. The breaking control method of the photovoltaic inverter according to claim 1, wherein After the step of controlling the disconnecting switch to close, it further includes: For each disconnecting switch, if a disconnect signal of the disconnecting switch is detected and it is detected that the DC conversion module corresponding to the disconnecting switch is still in the enabled state at the falling edge of the disconnect signal, a disconnecting switch fault alarm is performed.

5. The disconnection control method of the photovoltaic inverter according to claim 1, characterized in that, The DC conversion module is connected to the corresponding photovoltaic module through the corresponding disconnecting switch; The disconnecting switch includes at least two of a first switch, a second switch, a third switch, a fourth switch, and a fifth switch; the photovoltaic module includes at least two of a first photovoltaic module, a second photovoltaic module, a third photovoltaic module, a fourth photovoltaic module, and a fifth photovoltaic module; The first pole of the first photovoltaic module and the first pole of the second photovoltaic module are both connected to the corresponding DC conversion module through the first switch; the first poles of the third photovoltaic module, the fourth photovoltaic module, and the fifth photovoltaic module are all connected to the corresponding DC conversion module through the second switch; the second pole of the first photovoltaic module is connected to the corresponding DC conversion module through the third switch; the second poles of the second photovoltaic module and the third photovoltaic module are both connected to the corresponding DC conversion module through the fourth switch; the second poles of the fourth photovoltaic module and the fifth photovoltaic module are both connected to the corresponding DC conversion module through the fifth switch; The first pole of each photovoltaic module is the positive pole, and the second pole of each photovoltaic module is the negative pole; or, the first pole of each photovoltaic module is the negative pole, and the second pole of each photovoltaic module is the positive pole.

6. The breaking control method of the photovoltaic inverter according to claim 1, wherein, After controlling the auxiliary switch to close, it further includes: If the current in the branch where the auxiliary switch is located is greater than or equal to a second preset current, and / or the duration for which the auxiliary switch is closed is greater than or equal to a preset duration, then control the auxiliary switch to open.

7. The breaking control method of the photovoltaic inverter according to claim 1, wherein After controlling the auxiliary switch to close, it further includes: If the current in other branches is greater than or equal to a third preset current, then control the auxiliary switch to open; the other branches are the branches other than the branch where the auxiliary switch is located.

8. The breaking control method of the photovoltaic inverter according to any one of claims 1 to 7, characterized in that, The impedance of the branch where the auxiliary switch is located is greater than the impedance of other branches.

9. An electronic device, characterized in that, It includes a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the breaking control method of the photovoltaic inverter according to any one of claims 1 to 8.

10. A photovoltaic inverter, characterized in that, It includes an auxiliary switch, at least two DC conversion modules, at least one breaking switch, and the electronic device according to claim 9; the auxiliary switch, the breaking switch, and the DC conversion module are controlled by the electronic device; Each breaking switch corresponds to at least one of the DC conversion modules. The DC conversion module is connected to the corresponding photovoltaic module through the corresponding breaking switch, and each DC conversion module corresponds to at least two of the photovoltaic modules; the first end of the auxiliary switch is connected to one of the DC conversion modules, and the second end of the auxiliary switch is connected to one of the photovoltaic modules corresponding to the DC conversion module.

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