Inverter system detection method, device and inverter system

Abstract

The present application discloses a detection method, device and inverter system for an inverter system, and belongs to the technical field of inverter systems. The detection method for the inverter system includes: obtaining the output power corresponding to the target system connected to the at least one load; the target system is used to power the at least one load; the target system includes the photovoltaic system; based on the output power and the total power corresponding to the at least one load, performing arc detection on the faulty photovoltaic strings in the photovoltaic system. The detection method for the inverter system of the present application ensures the stability of load operation during arc detection, alleviates the impact of the reduction in the output power of the inverter system on load operation, improves the performance of the load and extends the service life of the load, reduces the safety hazards caused by unstable load operation, and improves the user experience.

Description

Technical Field

[0001] The present application belongs to the technical field of inverter systems, and in particular, relates to a detection method and device for an inverter system, and an inverter system. Background Art

[0002] When the inverter system is off-grid, arcs may be generated due to poor contact between the photovoltaic strings in the photovoltaic system and the inverter system, broken wiring, etc. In the related art, the method for detecting whether an arc has occurred has the possibility of false detection, and during the arc detection process, the DC side power is prone to reduction, resulting in a reduction in the output power of the inverter system, which cannot support the stable operation of the load, affecting the performance and service life of the load, and posing safety hazards, affecting the user experience. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a detection method, device and inverter system of an inverter system to ensure the stability of load operation during arc detection, alleviate the impact of reduced output power of the inverter system on load operation, improve load performance and extend the service life of the load, reduce the safety hazards caused by unstable load operation, and improve user experience.

[0004] In a first aspect, the present application provides a detection method for an inverter system, wherein the inverter system is electrically connected to a photovoltaic system and at least one load, respectively, and the photovoltaic system includes at least one photovoltaic string; the method includes:

[0005] Acquire output power corresponding to a target system connected to the at least one load; the target system is used to supply power to the at least one load; the target system includes the photovoltaic system;

[0006] Based on the output power and the total power corresponding to the at least one load, arc detection is performed on a faulty photovoltaic string in the photovoltaic system.

[0007] According to the detection method of the inverter system of the present application, the output power of the target system that supplies power to the load is obtained, and arc detection is performed based on the output power and the total power corresponding to each load. The stability of the load operation during the arc detection process is guaranteed, the impact of the reduction in the output power of the inverter system on the load operation is alleviated, the performance of the load is improved and the service life of the load is extended, the safety hazards caused by unstable load operation are reduced, and the user experience is improved.

[0008] According to the detection method of the inverter system of the present application, when the target system also includes at least one of an energy storage system and a power output system, the output power corresponding to the target system is the sum of the maximum output power corresponding to the photovoltaic system and at least one of the maximum output power corresponding to the energy storage system and the maximum output power corresponding to the power output system.

[0009] According to the detection method of the inverter system of the present application, when the target system is the photovoltaic system and the photovoltaic system includes multiple photovoltaic strings, the output power corresponding to the target system is the sum of the maximum output powers corresponding to the first part of the multiple photovoltaic strings included in the photovoltaic system; the first part of the photovoltaic strings are the remaining photovoltaic strings in the multiple photovoltaic strings except at least part of the photovoltaic strings; and the at least part of the photovoltaic strings include the faulty photovoltaic strings.

[0010] According to the detection method of the inverter system of the present application, the at least part of the photovoltaic strings includes the faulty photovoltaic string and at least one photovoltaic string located within a target range of the faulty photovoltaic string.

[0011] According to the detection method of the inverter system of the present application, the arc detection of the faulty photovoltaic string in the photovoltaic system based on the output power and the total power corresponding to the at least one load includes:

[0012] When the output power corresponding to the target system is greater than or equal to the total power, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

[0013] According to the detection method of the inverter system of the present application, the arc detection of the faulty photovoltaic string in the photovoltaic system based on the output power and the total power corresponding to the at least one load includes:

[0014] When the output power corresponding to the target system is less than the total power, cutting off a non-critical load in the at least one load; the non-critical load is preset;

[0015] When the output power corresponding to the target system is greater than or equal to the total power corresponding to the critical loads excluding the non-critical loads in the at least one load, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

[0016] According to the detection method of the inverter system of the present application, the non-critical load includes: at least one of a DC side non-critical load and an AC side non-critical load, and the cutting off of the non-critical load in the at least one load includes:

[0017] Based on the disconnection priority corresponding to the non-critical load on the DC side and the disconnection priority corresponding to the non-critical load on the AC side, the non-critical load in the at least one load is disconnected until the output power corresponding to the target system is greater than or equal to the new total power.

[0018] According to the detection method of the inverter system of the present application, the non-critical load in the at least one load is cut off based on the cut-off priority corresponding to the non-critical load on the DC side and the cut-off priority corresponding to the non-critical load on the AC side, until the output power corresponding to the target system is greater than or equal to the new total power, including:

[0019] Sequentially disconnecting the non-critical loads on the DC side and the non-critical loads on the AC side with a high disconnection priority, and obtaining a new total power;

[0020] When the output power corresponding to the target system is greater than or equal to the new total power, stopping the cutting operation;

[0021] When all loads on the target side are cut off and the output power corresponding to the target system is less than the new total power, non-critical loads on the other side except the target side are cut off in sequence until the output power corresponding to the target system is greater than or equal to the new total power.

[0022] According to the detection method of the inverter system of the present application, the method of cutting off the non-critical load in the at least one load based on the cutting off priority corresponding to the non-critical load on the DC side and the cutting off priority corresponding to the non-critical load on the AC side includes:

[0023] When the target system includes the photovoltaic system and at least one of an energy storage system and a power output system, and the photovoltaic system includes one photovoltaic string, the non-critical load in the at least one load is disconnected based on the disconnection priority.

[0024] According to the detection method of the inverter system of the present application, the method of cutting off the non-critical load in the at least one load based on the cutting off priority corresponding to the non-critical load on the DC side and the cutting off priority corresponding to the non-critical load on the AC side includes:

[0025] When the target system includes a photovoltaic system, and the photovoltaic system includes a plurality of photovoltaic strings, the non-critical load in the at least one load is disconnected based on the disconnection priority.

[0026] According to the detection method of the inverter system of the present application, the arc detection of the faulty photovoltaic string in the photovoltaic system includes:

[0027] Based on the work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system;

[0028] Arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

[0029] According to the detection method of the inverter system of the present application, the step of adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system based on the working priority includes:

[0030] When the target system includes the photovoltaic system, the energy storage system and the power output system, and the photovoltaic system is not allowed to output power, increasing the output power of the first system with the highest priority among the energy storage system and the power output system;

[0031] Obtaining the output power of a new target system;

[0032] Based on the output power of the new target system and the total power, the output power of a second system is controlled; the second system is a system other than the first system in the energy storage system and the power output system.

[0033] According to the detection method of the inverter system of the present application, the controlling the output power of the second system based on the output power of the new target system and the total power includes:

[0034] When the output power of the new target system is greater than or equal to the total power, maintaining the output power of the second system unchanged;

[0035] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is less than the total power, the output power of the second system is increased.

[0036] According to the detection method of the inverter system of the present application, the arc detection of the faulty photovoltaic string in the photovoltaic system includes:

[0037] The output electrical signals of at least part of the at least one photovoltaic string included in the photovoltaic system are reduced to perform arc detection on the faulty photovoltaic string in the photovoltaic system.

[0038] According to the detection method of the inverter system of the present application, the step of reducing the output electrical signal of at least part of the at least one photovoltaic string included in the photovoltaic system to perform arc detection on the faulty photovoltaic string in the photovoltaic system includes:

[0039] When the output electrical signal of at least part of the photovoltaic strings decreases, collecting the decreased output electrical signal;

[0040] After acquiring the reduced output electrical signal, increasing the output electrical signal of at least part of the photovoltaic strings, and collecting the increased output electrical signal;

[0041] In the case where the increased output electrical signal is greater than or equal to the decreased output electrical signal and / or the increased output electrical signal is greater than or equal to an electrical signal threshold, determining that the faulty photovoltaic string does not generate an arc;

[0042] When the increased output electrical signal is smaller than the decreased output electrical signal and / or the increased output electrical signal is smaller than an electrical signal threshold, it is determined that an electric arc is generated in the faulty photovoltaic string.

[0043] In a second aspect, the present application provides a detection device for an inverter system, wherein the inverter system is electrically connected to a photovoltaic system and at least one load, respectively, the photovoltaic system includes a plurality of photovoltaic strings, and the inverter system is electrically connected to an energy storage system and a power output system; the device includes:

[0044] A first processing module is used to obtain an output power corresponding to a target system connected to the at least one load; the target system is used to supply power to the at least one load; the target system includes the photovoltaic system;

[0045] The second processing module is used to perform arc detection on a faulty photovoltaic string in the photovoltaic system based on the output power and the total power corresponding to the at least one load.

[0046] According to the detection device of the inverter system of the present application, the output power of the target system that supplies power to the load is obtained, and arc detection is performed based on the output power and the total power corresponding to each load, so as to ensure the stability of the load operation during the arc detection process, alleviate the impact of the reduction in the output power of the inverter system on the load operation, improve the performance of the load and extend the service life of the load, reduce the safety hazards caused by unstable operation of the load, and improve the user experience.

[0047] In a third aspect, the present application provides an inverter system, which performs detection based on the detection method for the inverter system as described in the first aspect.

[0048] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the detection method of the inverter system as described in the first aspect above.

[0049] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the detection method of the inverter system as described in the first aspect above.

[0050] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0051] By obtaining the output power of the target system that supplies power to the load and performing arc detection based on the output power and the total power corresponding to each load, the stability of load operation is guaranteed during arc detection, the impact of reduced output power of the inverter system on load operation is alleviated, the performance of the load is improved and the service life of the load is extended, the safety hazards caused by unstable load operation are reduced, and the user experience is improved.

[0052] Furthermore, by determining that the maximum output power is greater than or equal to the total load, it is determined that when the output power of the target system reaches the maximum value, the stable operation of each load can be guaranteed. In this case, arc detection can be performed on the faulty photovoltaic string to ensure the safety of the detection process.

[0053] Furthermore, by cutting off non-critical loads among multiple loads when it is determined that the output power corresponding to the target system is less than the total power, the loads that need to be powered are reduced, thereby reducing the total load, so that the output power of the target system can enable the critical loads to operate stably, thereby ensuring the operating status of each load during the arc detection process and improving the safety of the detection process.

[0054] Furthermore, the output power of the photovoltaic system, the output power of the energy storage system and the output power of the power output system are adjusted by work priority, so that the power supply system that wishes to output power first can output power first, effectively reducing the power output cost, saving energy and increasing efficiency, and improving energy utilization.

[0055] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0057] Figure 1 This is one of the flow charts of the detection method of the inverter system provided in the embodiment of the present application;

[0058] Figure 2 This is a second flow chart of the detection method of the inverter system provided in the embodiment of the present application;

[0059] Figure 3 This is a third flow chart of the detection method of the inverter system provided in the embodiment of the present application;

[0060] Figure 4 This is one of the principle schematic diagrams of the detection method of the inverter system provided in the embodiment of the present application;

[0061] Figure 5 This is the second principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0062] Figure 6 This is the third principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0063] Figure 7 This is the fourth principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0064] Figure 8 This is the fifth principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0065] Fig. 9 This is the sixth principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0066] Fig.10 This is the seventh principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0067] Fig.11 This is the eighth principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0068] Fig.12 This is the ninth principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0069] Fig.13 This is the tenth principle schematic diagram of the detection method of the inverter system provided in the embodiment of the present application;

[0070] Fig.14 is a structural schematic diagram of a detection device for an inverter system provided in an embodiment of the present application;

[0071] Fig.15 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0073] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0074] In combination with the accompanying drawings, the detection method of the inverter system, the detection device of the inverter system, the inverter system, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0075] The detection method of the inverter system may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0076] The terminal includes but is not limited to portable communication devices such as mobile phones or tablet computers. It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer.

[0077] In the following various embodiments, a terminal including a display and a touch-sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, a mouse and a joystick.

[0078] The detection method of the inverter system provided in the embodiment of the present application can be executed by the inverter system, or can be a detection device of the inverter system arranged on the inverter system, or can also be a server electrically connected to the inverter system (wired or wireless connection), or can also be a user terminal communicatively connected to the inverter system, including but not limited to mobile terminals and non-mobile terminals.

[0079] like Figure 1 As shown, the detection method of the inverter system includes: step 110 and step 120.

[0080] The inverter system is electrically connected to the photovoltaic system and at least one load respectively.

[0081] The photovoltaic system includes at least one photovoltaic string.

[0082] The at least one load includes at least one of a DC side load and an AC side load.

[0083] The DC side load and the AC side load can be selectively connected based on the actual execution situation.

[0084] The DC side load refers to all loads on the DC side.

[0085] The AC side load refers to all loads on the AC side.

[0086] Step 110: Obtain output power corresponding to a target system connected to at least one load;

[0087] In this step, the target system is used to supply power to at least one load.

[0088] The target system includes one or more power supply systems.

[0089] The target system may include a photovoltaic system.

[0090] The output power corresponding to the target system may include a maximum output power corresponding to the target system, an output power relatively close to the maximum output power corresponding to the target system, or an output power customized by a user.

[0091] In the actual execution process, the output power corresponding to the target system can be obtained based on the actual situation of the target system to which multiple loads are connected.

[0092] In some embodiments, the target system may include not only a photovoltaic system but also other systems capable of supplying power to a load.

[0093] The specific type of the system for powering the load included in the target system can be determined based on actual conditions and is not limited in this application.

[0094] In actual implementation, the output power of the target system can be obtained in any feasible way.

[0095] In some embodiments, when the target system may also include at least one of an energy storage system and a power output system, the output power corresponding to the target system is the sum of the maximum output power corresponding to the photovoltaic system and at least one of the maximum output power corresponding to the energy storage system and the maximum output power corresponding to the power output system.

[0096] In this embodiment, the maximum output power corresponding to the photovoltaic system can be expressed as Ps1.

[0097] Energy storage systems can be used to power loads.

[0098] The maximum output power of the energy storage system can be expressed as Ps2.

[0099] like Figure 4 As shown, the energy storage system may include multiple battery packs.

[0100] Each battery pack includes at least one direct current-to-direct current (DC-DC) converter and a battery cell.

[0101] The power output system can be used to power a load.

[0102] The power output system includes but is not limited to oil generators and other inverters.

[0103] The maximum output power of the power output system can be expressed as Ps3.

[0104] In some embodiments, when the target system includes a photovoltaic system and the photovoltaic system includes a photovoltaic assembly, the target system may include at least one of an energy storage system and a power output system.

[0105] For example, the target system may include a photovoltaic module and an energy storage system.

[0106] The target system may include a photovoltaic module and a power output system.

[0107] The target system may include a photovoltaic panel, an energy storage system, and a power output system.

[0108] It can be understood that, when the photovoltaic system included in the target system includes one photovoltaic component, the photovoltaic component is a faulty photovoltaic component.

[0109] In the case where the target system may include a photovoltaic module and an energy storage system, the output power of the target system is the maximum output power of the energy storage system.

[0110] In the case where the target system may include a photovoltaic component and a power output system, the output power of the target system is the maximum output power of the power output system.

[0111] In the case where the target system includes a photovoltaic module, an energy storage system and a power output system, the output power of the target system is the sum of the maximum output power of the energy storage system and the maximum output power of the power output system.

[0112] In some embodiments, the target system may include a photovoltaic system and the photovoltaic system includes a plurality of photovoltaic modules.

[0113] In this embodiment, the target system may include a photovoltaic system.

[0114] Target systems may include photovoltaic systems and energy storage systems.

[0115] Target systems may include photovoltaic systems and power output systems.

[0116] Target systems may include photovoltaic systems, energy storage systems, and power output systems.

[0117] In the case where the target system may include a photovoltaic system, the output power of the target system is the maximum output power of the photovoltaic system.

[0118] In the case where the target system may include a photovoltaic system and an energy storage system, the output power of the target system is the sum of the maximum output power of the photovoltaic system and the maximum output power of the energy storage system.

[0119] In the case where the target system may include a photovoltaic system and a power output system, the output power of the target system is the sum of the maximum output power of the photovoltaic system and the maximum output power of the power output system.

[0120] In the case where the target system may include a photovoltaic system, an energy storage system and a power output system, the output power of the target system is the sum of the maximum output power of the photovoltaic system, the maximum output power of the energy storage system and the maximum output power of the power output system.

[0121] According to the detection method of the inverter system provided in the embodiment of the present application, by determining that the target system actually includes one or more systems for powering the load, and obtaining the maximum output power of the system that powers each load, the output power of the target system is calculated, the maximum power that the target system can output is effectively determined, and accurate information on the power supply of the target system is obtained, so that arc detection can be performed based on the maximum output power in the future.

[0122] like Figure 5 As shown, in some embodiments, when the target system is a photovoltaic system and the photovoltaic system includes multiple photovoltaic strings, the output power corresponding to the target system is the sum of the maximum output powers corresponding to the first part of the multiple photovoltaic strings included in the photovoltaic system.

[0123] In this embodiment, the first part of photovoltaic strings is the remaining photovoltaic strings except for at least part of the photovoltaic strings in the plurality of photovoltaic strings.

[0124] At least some of the photovoltaic strings include faulty photovoltaic strings.

[0125] In some embodiments, at least some of the photovoltaic strings include only faulty photovoltaic strings.

[0126] Taking the photovoltaic system including 5 photovoltaic strings and the faulty photovoltaic string being the third photovoltaic string as an example, in this case, at least part of the photovoltaic strings are the third photovoltaic strings, and the first part of the photovoltaic strings are the remaining 4 photovoltaic strings except the third photovoltaic string.

[0127] The output power of the target system is the sum of the maximum output powers of the remaining four PV strings.

[0128] In some embodiments, at least some of the photovoltaic strings include a faulty photovoltaic string and at least one photovoltaic string located within a target range of the faulty photovoltaic string.

[0129] In this embodiment, the target range is a preset value used to determine the photovoltaic strings located around the faulty photovoltaic string.

[0130] The specific value of the target range can be determined based on actual conditions and is not limited in this application.

[0131] Taking a photovoltaic system including 5 photovoltaic strings and the faulty photovoltaic string being the third photovoltaic string as an example, at least some of the photovoltaic strings may be the faulty photovoltaic string and the previous photovoltaic string and the next photovoltaic string adjacent to the faulty photovoltaic string, that is, at least some of the photovoltaic strings are the second photovoltaic string, the third photovoltaic string and the fourth photovoltaic string.

[0132] The first part of photovoltaic strings includes the first photovoltaic string and the fifth photovoltaic string except the second photovoltaic string, the third photovoltaic string and the fourth photovoltaic string.

[0133] According to the detection method of the inverter system provided in the embodiment of the present application, by determining the actual situation of the photovoltaic system included in the target system, and using some fault-free photovoltaic strings to power the load, the faulty photovoltaic string and one or more photovoltaic strings within the target range of the faulty photovoltaic string do not need to be load power, thereby alleviating the technical problem that the faulty photovoltaic string affects the performance of the surrounding photovoltaic strings, making it impossible for the surrounding photovoltaic strings to supply power stably, and determining the output power of the target system as stable output power, effectively providing accurate power supply data, thereby providing precise data for subsequent stable operation of the load and improving the accuracy of the judgment conditions.

[0134] In actual implementation, at least part of the photovoltaic strings include a faulty photovoltaic string and may also include a faulty photovoltaic string and at least one photovoltaic string located within a target range of the faulty photovoltaic string.

[0135] Whether at least some of the photovoltaic strings include at least one photovoltaic string within the target range of the faulty photovoltaic strings may be determined based on whether the faulty photovoltaic string affects the performance of at least one photovoltaic string within its target range.

[0136] For example, when at least one photovoltaic string within the target range can provide stable power supply, whether at least part of the photovoltaic strings include faulty photovoltaic strings.

[0137] Of course, the conditions of the photovoltaic strings specifically included in at least some of the photovoltaic strings can also be determined based on other conditions, and this application does not limit this.

[0138] According to the detection method of the inverter system provided in the embodiment of the present application, by determining the photovoltaic strings in the photovoltaic system included in the target system that can actually power the load, the output power of the target system is effectively determined, providing data support for whether the subsequent load can operate stably, thereby increasing the probability of stable operation of the load.

[0139] Step 120: Perform arc detection on a faulty photovoltaic string in the photovoltaic system based on the output power and the total power corresponding to at least one load.

[0140] In this step, the total power is the sum of the power required by each load.

[0141] The total power is the power corresponding to the DC side load and the power corresponding to the AC side load.

[0142] The power corresponding to the DC side load can be expressed as Pdc.

[0143] The power corresponding to the AC side load can be expressed as Pac.

[0144] In actual implementation, arc detection may be performed on a faulty photovoltaic string in the photovoltaic system based on a magnitude relationship between the maximum output power and the total power corresponding to at least one load.

[0145] For example, when the maximum output power can meet the requirements of stable operation of various loads, arc detection is performed on faulty photovoltaic strings in the photovoltaic system.

[0146] like Figure 2 As shown, in the actual execution process, the output power of the target system is calculated based on the maximum output power of each system included in the target system, and then it is determined whether the maximum output power can meet the total power corresponding to multiple loads. If it meets the total power, the faulty photovoltaic component is detected for arc.

[0147] During the research and development process, the inventors discovered that arcs may occur between the photovoltaic strings and the inverter system due to poor contact and broken wiring. In the process of detecting whether an arc has occurred, false detections may occur. In the related art, the method for determining whether a false detection has occurred requires controlling the DC side current to verify whether the wiring is actually disconnected. During this period, the DC side power is reduced, resulting in a reduction in the output power of the inverter system, which cannot support the stable operation of the DC or AC side loads, affecting the performance and service life of the loads, and posing a safety hazard, affecting the user experience.

[0148] The present application obtains the output power of the target system that supplies power to the load, effectively obtains the maximum output power that the target system can provide, and compares the correlation between the output power of the target system and the total power corresponding to each load to determine whether the output power of the target system can meet the power required by each load, so that each load can operate stably and ensure the stability of the operation of each load during the arc detection process.

[0149] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of the target system that supplies power to the load is obtained, and arc detection is performed based on the output power and the total power corresponding to each load. The stability of the load operation during the arc detection process is ensured, the impact of the reduction in the output power of the inverter system on the load operation is alleviated, the performance of the load is improved and the service life of the load is extended, the safety hazards caused by unstable load operation are reduced, and the user experience is improved.

[0150] In some embodiments, step 120 may further include:

[0151] When the output power corresponding to the target system is greater than or equal to the total power, arc detection is performed on the faulty photovoltaic strings in the photovoltaic system.

[0152] In this embodiment, when the output power corresponding to the target system is greater than or equal to the total power, it is characterized that the output power corresponding to the target system can enable each load to operate stably.

[0153] On the basis of stable operation of each load, arc detection can be performed on faulty photovoltaic strings in the photovoltaic system.

[0154] In some embodiments, when the output power corresponding to the target system is greater than or equal to the total power, performing arc detection on a faulty photovoltaic string in the photovoltaic system may further include:

[0155] When the output power corresponding to the target system is greater than or equal to the difference between the total power and the arc power of the conductor, arc detection is performed on the faulty photovoltaic strings in the photovoltaic system.

[0156] In this embodiment, the conductor arc power is the power required to maintain arcing in the conductors connecting at least part of the photovoltaic strings to the inverter system.

[0157] In the actual execution process, when the output power corresponding to the target system is greater than or equal to the difference between the total power and the arc power of the conductor, it is characterized that the output power corresponding to the target system can enable each load to operate stably.

[0158] In some embodiments, when the target system includes a photovoltaic system and an energy storage system, the following formula may be used:

[0159]

[0160] Make sure that the output power corresponding to the target system is greater than or equal to the difference between the total power and the wire arc power.

[0161] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps2 is the maximum output power corresponding to the energy storage system; Pac is the power corresponding to the AC side load; Pdc is the power corresponding to the DC side load; deltaP is the wire arc power.

[0162] like Figure 5 As shown, in some embodiments, when the target system includes a photovoltaic system, an energy storage system, and a power output system, the following formula may be used:

[0163]

[0164] Make sure that the output power corresponding to the target system is greater than or equal to the difference between the total power and the wire arc power.

[0165] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps2 is the maximum output power corresponding to the energy storage system; Ps3 is the maximum output power corresponding to the power output system; Pac is the power corresponding to the AC side load; Pdc is the power corresponding to the DC side load; deltaP is the wire arc power.

[0166] In some embodiments, when the target system includes a photovoltaic system and a power output system, the following formula may be used:

[0167]

[0168] Make sure that the output power corresponding to the target system is greater than or equal to the difference between the total power and the wire arc power.

[0169] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps3 is the maximum output power corresponding to the power output system; Pac is the power corresponding to the AC side load; Pdc is the power corresponding to the DC side load; deltaP is the wire arc power.

[0170] In some embodiments, when the target system includes a photovoltaic system, the following formula may be used:

[0171]

[0172] Make sure that the output power corresponding to the target system is greater than or equal to the difference between the total power and the wire arc power.

[0173] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Pac is the power corresponding to the AC side load; Pdc is the power corresponding to the DC side load; deltaP is the wire arc power.

[0174] On the basis of stable operation of each load, arc detection can be performed on faulty photovoltaic strings in the photovoltaic system.

[0175] According to the detection method of the inverter system provided in the embodiment of the present application, by determining that the maximum output power is greater than or equal to the total load and determining that the output power of the target system reaches the maximum value, stable operation of each load can be guaranteed. In this case, arc detection can be performed on the faulty photovoltaic string to ensure the safety of the detection process.

[0176] In some embodiments, step 120 may further include:

[0177] When the output power corresponding to the target system is less than the total power, cutting off a non-critical load in at least one load;

[0178] When the output power corresponding to the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in at least one load, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

[0179] In this embodiment, the non-critical loads are pre-set.

[0180] In some embodiments, non-critical loads may also be determined based on the interfaces to which the loads are connected.

[0181] Non-critical loads can also be customized by the user or determined based on actual conditions, which is not limited in this application.

[0182] The critical load is the load remaining after cutting off the non-critical load among all the loads connected to the target system.

[0183] Critical loads and non-critical loads can be selectively connected based on the needs of actual application scenarios.

[0184] Continue to refer Figure 2In the actual execution process, when the output power corresponding to the target system is less than the total power, it can be checked whether the multiple loads connected to the target system include non-critical loads. If non-critical loads are included, the non-critical loads can be cut off by the load switch.

[0185] After cutting off the non-critical loads, the total power corresponding to at least one load is re-determined, that is, a new total power is obtained, and the correlation between the output power corresponding to the target system and the new total power is compared.

[0186] When it is determined that the output power corresponding to the target system is greater than or equal to the new total power, arc detection can be performed on the faulty photovoltaic string.

[0187] According to the detection method of the inverter system provided in the embodiment of the present application, by cutting off non-critical loads among multiple loads when it is determined that the output power corresponding to the target system is less than the total power, the loads that require power supply are reduced, thereby reducing the total load, so that the output power of the target system can enable the critical load to operate stably, thereby ensuring the operating status of each load during the arc detection process and improving the safety of the detection process.

[0188] In some embodiments, the non-critical load includes: at least one of a DC side non-critical load and an AC side non-critical load, and cutting off the non-critical load in at least one load may include:

[0189] Based on the disconnection priorities corresponding to the non-critical loads on the DC side and the disconnection priorities corresponding to the non-critical loads on the AC side, the non-critical loads in at least one load are disconnected until the output power corresponding to the target system is greater than or equal to the new total power.

[0190] In this embodiment, the DC side load may include: a DC side critical load and a DC side non-critical load.

[0191] The power corresponding to the key load on the DC side can be expressed as Pdc_key.

[0192] The correlation between the power corresponding to the key load on the DC side and the power corresponding to the load on the DC side can be determined based on the following formula:

[0193]

[0194] in, is the power corresponding to the key load on the DC side, is the power corresponding to the DC side load.

[0195] It is understandable that when there is no load connected to the DC side, .

[0196] The AC side load may include: an AC side critical load and an AC side non-critical load.

[0197] The power corresponding to the key load on the AC side can be expressed as Pac_key.

[0198] The correlation between the power corresponding to the key load on the AC side and the power corresponding to the load on the AC side can be determined based on the following formula:

[0199]

[0200] in, is the power corresponding to the key load on the AC side, is the power corresponding to the AC side load.

[0201] It is understandable that when there is no load connected to the AC side, .

[0202] The cut-off priority is the level at which the load is cut off.

[0203] The cut-off priority may be user-defined or determined based on actual conditions, and this application does not limit this.

[0204] The new total power is the total power of the remaining loads in the at least one load except the cut-off non-critical load after the non-critical load is cut off.

[0205] It can be understood that as the number of non-critical loads that are disconnected increases, the new total power decreases.

[0206] In the actual implementation process, when it is determined that non-critical loads need to be cut off, it can be determined based on the cut-off priority whether to cut off the non-critical loads on the DC side or the non-critical loads on the AC side first, until the output power of the target system is greater than or equal to the new total power.

[0207] According to the detection method of the inverter system provided in the embodiment of the present application, by cutting off the priority non-critical loads selected from the non-critical loads, some non-critical loads can be cut off on the basis of meeting the user's usage needs, so that the output power of the target system can be greater than or equal to the new total power, thereby ensuring the stability of the remaining critical loads.

[0208] In some embodiments, based on the disconnection priority corresponding to the non-critical load on the DC side and the disconnection priority corresponding to the non-critical load on the AC side, disconnecting the non-critical load in at least one load until the output power corresponding to the target system is greater than or equal to the new total power may include:

[0209] Cut off the non-critical loads on the DC side and the non-critical loads on the AC side in turn, and cut off the non-critical loads on the target side with a high priority, and obtain a new total power;

[0210] When the output power corresponding to the target system is greater than or equal to the new total power, the cutting operation is stopped;

[0211] When all loads on the target side are cut off and the output power corresponding to the target system is less than the new total power, non-critical loads on the other side except the target side are cut off in turn until the output power corresponding to the target system is greater than or equal to the new total power.

[0212] In this embodiment, the target side is any one of the DC side and the AC side.

[0213] The other side is a side different from the target side.

[0214] In the case where the target side is the DC side, the other side is the AC side.

[0215] In the case where the target side is the AC side, the other side is the DC side.

[0216] It can be understood that there may be multiple non-critical loads on the DC side and multiple non-critical loads on the AC side.

[0217] In the actual execution process, the non-critical loads on the target side can be cut off in sequence to obtain a new total power after the non-critical loads are cut off, and subsequent operations are determined based on the new total power.

[0218] For example, when the target side is the DC side and the DC side includes 5 non-critical loads on the DC side, the 5 non-critical loads on the DC side can be cut off in sequence. After cutting off any non-critical load on the DC side, a new total power can be obtained. The correlation between the output power of the target system and the new total power can be compared to determine whether to continue cutting off the non-critical loads on the DC side.

[0219] After cutting off the two non-critical loads on the DC side, the cutting operation may be stopped when the output power of the target system is greater than or equal to the new total power.

[0220] After cutting off all five non-critical loads on the DC side, if the output power corresponding to the target system is still less than the new total power, the non-critical loads on the other side, i.e., the AC side, can be cut off in sequence until the output power corresponding to the target system is greater than or equal to the new total power.

[0221] According to the detection method of the inverter system provided in the embodiment of the present application, the total power required by the loads is gradually reduced by sequentially cutting off the non-critical loads on the target side with high priority and the non-critical loads on the other side, that is, obtaining a new total power, so that the output power of the target system can be greater than or equal to the new total power, thereby enabling each load to operate stably and improving the accuracy of arc detection.

[0222] As shown in Table 1, various situations of the photovoltaic system, energy storage system and power output system included in the target system, as well as the correlation between the output power of the target system and the total power of the load for stable operation are shown.

[0223] Table 1

[0224]

[0225] The power output devices in Table 1 are devices included in the target system that can output power to the load. √ indicates that the target system needs to include the maximum output power of this component in the process of judging whether the maximum output power meets the stable operation of the load. × indicates that the target system does not need to include the maximum output power of this system, or the corresponding system output power is not desired in the process of false detection judgment of faulty PV strings.

[0226] The load to be judged in Table 1 is the load connected to the target system, √ indicates the load power that needs to be included when judging whether the output power of the target system meets the total power, and deltaP is the wire arc power.

[0227] It can be understood that the non-critical loads to be cut off will be different depending on the power supply system included in the target system.

[0228] The following describes how to cut off non-critical loads based on the actual situation of the target system.

[0229] In some embodiments, based on the disconnection priority corresponding to the non-critical load on the DC side and the disconnection priority corresponding to the non-critical load on the AC side, disconnecting the non-critical load in the at least one load may include:

[0230] When the target system includes a photovoltaic system and at least one of an energy storage system and a power output system, and the photovoltaic system includes one photovoltaic string, a non-critical load in at least one load is disconnected based on a disconnection priority.

[0231] In this embodiment, in some embodiments, when the target system includes a photovoltaic system and an energy storage system, and the output power corresponding to the target system is less than the total power, the non-critical load in at least one load can be cut off based on the cutoff priority corresponding to the non-critical load on the DC side and the cutoff priority corresponding to the non-critical load on the AC side.

[0232] In this embodiment, taking cutting off the non-critical load on the DC side as an example, after cutting off the non-critical load on the DC side, the correlation relationship between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0233] It can be based on the following formula:

[0234]

[0235] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0236] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps2 is the maximum output power corresponding to the energy storage system; Pac is the power corresponding to the AC side load; Pdc_key is the power corresponding to the key load on the DC side; deltaP is the wire arc power.

[0237] Taking cutting off the non-critical load on the AC side as an example, after cutting off the non-critical load on the AC side, the correlation between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0238] It can be based on the following formula:

[0239]

[0240] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0241] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps2 is the maximum output power corresponding to the energy storage system; Pac_key is the power corresponding to the key load on the AC side; Pdc_key is the power corresponding to the key load on the DC side; deltaP is the arc power of the conductor.

[0242] In some embodiments, when the target system includes a photovoltaic system, an energy storage system, and a power output system, and the output power corresponding to the target system is less than the total power, a non-critical load in at least one load can be cut off based on the cutoff priority corresponding to the non-critical load on the DC side and the cutoff priority corresponding to the non-critical load on the AC side.

[0243] In this embodiment, taking cutting off the non-critical load on the DC side as an example, after cutting off the non-critical load on the DC side, the correlation relationship between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0244] It can be based on the following formula:

[0245]

[0246] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0247] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps2 is the maximum output power corresponding to the energy storage system; Ps3 is the maximum output power corresponding to the power output system; Pac is the power corresponding to the AC side load; Pdc_key is the power corresponding to the key load on the DC side; deltaP is the wire arc power.

[0248] Taking cutting off the non-critical load on the AC side as an example, after cutting off the non-critical load on the AC side, the correlation between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0249] It can be based on the following formula:

[0250]

[0251] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0252] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps2 is the maximum output power corresponding to the energy storage system; Ps3 is the maximum output power corresponding to the power output system; Pac_key is the power corresponding to the key load on the AC side; Pdc is the power corresponding to the DC side load; deltaP is the wire arc power.

[0253] In some embodiments, when the target system includes a photovoltaic system and a power output system, and the output power corresponding to the target system is less than the total power, a non-critical load in at least one load can be cut off based on the cutoff priority corresponding to the non-critical load on the DC side and the cutoff priority corresponding to the non-critical load on the AC side.

[0254] In this embodiment, taking cutting off the non-critical load on the DC side as an example, after cutting off the non-critical load on the DC side, the correlation relationship between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0255] It can be based on the following formula:

[0256]

[0257] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0258] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps3 is the maximum output power corresponding to the power output system; Pac is the power corresponding to the AC side load; Pdc_key is the power corresponding to the key load on the DC side; deltaP is the wire arc power.

[0259] Taking cutting off the non-critical load on the AC side as an example, after cutting off the non-critical load on the AC side, the correlation between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0260] It can be based on the following formula:

[0261]

[0262] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0263] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Ps3 is the maximum output power corresponding to the power output system; Pac_key is the power corresponding to the key load on the AC side; Pdc_key is the power corresponding to the key load on the DC side; deltaP is the wire arc power.

[0264] According to the detection method of the inverter system provided in the embodiment of the present application, the non-critical loads that need to be cut off are determined through the actual situation of the system for powering the load included in the target system and based on the cutoff priority.

[0265] like Figure 6 As shown, in some embodiments, based on the disconnection priority corresponding to the non-critical load on the DC side and the disconnection priority corresponding to the non-critical load on the AC side, disconnecting the non-critical load in at least one load may include:

[0266] When the target system includes a photovoltaic system, and the photovoltaic system includes a plurality of photovoltaic strings, a non-critical load among the at least one load is disconnected based on a disconnection priority.

[0267] In this embodiment, the maximum output power corresponding to the photovoltaic system can be determined based on the maximum output powers of multiple photovoltaic modules; that is, Ps1 is the sum of the maximum output powers of multiple photovoltaic modules.

[0268] Taking cutting off the non-critical load on the DC side as an example, after cutting off the non-critical load on the DC side, the correlation relationship between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0269] It can be based on the following formula:

[0270]

[0271] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0272] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Pac is the power corresponding to the AC side load; Pdc_key is the power corresponding to the key load on the DC side; deltaP is the wire arc power.

[0273] Taking cutting off the non-critical load on the AC side as an example, after cutting off the non-critical load on the AC side, the correlation between the output power of the target system and the total power corresponding to the critical load other than the non-critical load in at least one load can be compared again.

[0274] It can be based on the following formula:

[0275]

[0276] It is determined that the output power of the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in the at least one load.

[0277] Among them, Ps1 is the maximum output power corresponding to the photovoltaic system; Pac_key is the power corresponding to the key load on the AC side; Pdc is the power corresponding to the DC side load; deltaP is the wire arc power.

[0278] In some embodiments, the target system may further include a photovoltaic system of a plurality of photovoltaic strings and at least one of an energy storage system and a power output system.

[0279] In this embodiment, when the target system includes at least one of a photovoltaic system, an energy storage system and a power output system, and the photovoltaic system includes a photovoltaic string, based on the cutoff priority corresponding to the non-critical load on the DC side and the cutoff priority corresponding to the non-critical load on the AC side, a non-critical load in at least one load can be cut off. The non-critical load can be cut off in a similar manner, which is not described here to avoid repetition.

[0280] According to the detection method of the inverter system provided in the embodiment of the present application, by determining that the target system includes a photovoltaic system and based on the cut-off priority, determining the non-critical loads that need to be cut off, it is ensured that the cut-off non-critical loads do not affect the user experience.

[0281] In some embodiments, performing arc detection on a faulty photovoltaic string in a photovoltaic system may include:

[0282] Based on the work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system;

[0283] Perform arc detection on faulty PV strings in PV systems.

[0284] In this embodiment, the working priority is to determine the priority of the target system to output power first.

[0285] The work priority can be based on user customization or determined based on actual execution conditions, and this application does not limit it.

[0286] It can be understood that each system included in the target system has a corresponding work priority.

[0287] In the actual execution process, the output power of the target system may be adjusted based on the fact that each system included in the target system has a corresponding working priority.

[0288] For example, the output power of each system with a high working priority corresponding to the target system is preferentially adjusted, so that the target system can meet the power required by multiple loads.

[0289] When the target system after adjustment is able to make the load operate stably, arc detection can be performed on faulty photovoltaic strings in the photovoltaic system.

[0290] like Figure 3 As shown, by adjusting one or more of the output power of the photovoltaic system, the output power of the energy storage system and the output power of the power output system included in the target system, the output power of the target system can meet the total power required for stable operation of the load, and adjust the output electrical signals of at least part of the photovoltaic strings to perform arc detection on the faulty photovoltaic strings, determine whether the faulty photovoltaic strings actually generate an arc, and perform arc extinguishing operations when an arc is generated.

[0291] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of the photovoltaic system, the output power of the energy storage system and the output power of the power output system are adjusted by working priority, so that the power supply system that wishes to output power first outputs power, effectively reducing the power output cost, saving energy and increasing efficiency, and improving energy utilization.

[0292] As shown in Table 2, various situations of work priority are shown.

[0293] Table 2

[0294]

[0295] In the actual execution process, the required work priority can be selected based on the actual situation of the target system to meet the actual usage needs and reduce the usage cost.

[0296] The following describes a method for adjusting the output power of the target system based on the work priority.

[0297] First, the target system includes the photovoltaic system, energy storage system and power output system, and the photovoltaic system is not allowed to output power, and adjustments are made based on work priority.

[0298] like Figure 7 As shown, in some embodiments, based on the work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system may include:

[0299] When the target system includes a photovoltaic system, an energy storage system, and a power output system, and the photovoltaic system is not allowed to output power, increasing the output power of the first system with the highest priority among the energy storage system and the power output system;

[0300] Obtaining the output power of a new target system;

[0301] Based on the output power and the total power of the new target system, the output power of the second system is controlled.

[0302] In this embodiment, the first system is any one of an energy storage system and a power output system.

[0303] The second system is a system other than the first system in the energy storage system and the power output system.

[0304] When the first system is an energy storage system, the second system is a power output system.

[0305] In the case where the first system is a power output system, the second system is an energy storage system.

[0306] In some embodiments, before increasing the output power of a first system with the highest priority among the energy storage system and the power output system, the output power of the energy storage system and the output power of the power output system are initial values.

[0307] In this embodiment, the initial value may be determined based on actual conditions. For example, the initial value may be 0 or 10, which is not limited in this application.

[0308] In the actual implementation process, the output power of the energy storage system and the output power of the power output system can be increased in any feasible way, and this application does not limit this.

[0309] It can be understood that in the process of increasing the output power of the energy storage system and the output power of the power output system, the output power of the new target system can be updated in real time.

[0310] When the first system is an energy storage system, the output power of the new target system can be calculated based on the initial value of the output power of the energy storage system, the output power increase of the energy storage system, and the initial value of the output power of the power output system.

[0311] In some embodiments, the output power of a first system having the highest priority among the energy storage system and the power output system may be increased based on the first amplitude.

[0312] In this embodiment, the specific value of the first amplitude may be user-defined or determined based on actual conditions, and this application does not limit this.

[0313] For example, take the first system as an energy storage system and the second system as a power output system.

[0314] In the actual implementation process, the output power of the target system can be increased based on the first system with the highest priority, that is, the output power of the energy storage system is increased first, and the power output system is controlled based on the correlation between the output power of the new target system and the total power.

[0315] In some embodiments, the correlation between the output power of the new target system and the total power may be compared in real time to determine whether to stop increasing the output power of the energy storage system.

[0316] For another example, take the first system as a power output system and the second system as an energy storage system.

[0317] In the actual execution process, the output power of the power output system can be increased based on the first system with the highest priority. After the output power of the power output system is increased, the output power of the target system will also change. The output power of the new target system can be obtained, and the energy storage system can be controlled based on the correlation between the output power of the new target system and the total power.

[0318] In some embodiments, the correlation between the output power of the new target system and the total power may be compared in real time to determine whether to stop increasing the output power of the power output system.

[0319] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of the first system with the highest priority among the energy storage system and the power output system is preferentially increased to increase the output power of the target system, so that the output power of the target system can gradually meet the load demand. After increasing the output power of the first system, the subsequent operation of the second system can be determined based on the correlation between the output power of the new target system and the total load, without increasing the output power of each power supply system included in the target system, thereby effectively saving energy, reducing energy waste, and improving energy utilization.

[0320] In some embodiments, controlling the output power of the second system based on the output power and the total power of the new target system may include:

[0321] When the output power of the new target system is greater than or equal to the total power, the output power of the second system is kept unchanged;

[0322] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is less than the total power, the output power of the second system is increased.

[0323] In this embodiment, when the output power of the new target system is greater than or equal to the total power, it is characterized that the output power of the new target system can make the load run stably, and the target system can be operated based on the output power of the new target system.

[0324] In actual implementation, the output power of the first system may be increased to a maximum output power. After the output power of the first system is increased to the maximum output power, the output power of the new target system is determined based on the maximum output power of the first system.

[0325] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is still less than the total power required for stable operation of the load, the output power of the second system can be further increased.

[0326] like Figure 6 As shown, for example, in the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and other inverters (i.e., a power output system), and the photovoltaic system is not desired to output power, and the first system is the energy storage system and the second system is other inverters, the output power of the energy storage system can be continuously increased.

[0327] In the process of increasing the output power of the energy storage system, if the energy storage system can satisfy the total power required for stable operation of the load without reaching the maximum output power, the output power of the energy storage system can be stopped from being increased.

[0328] The output power of the new target system can be obtained based on the increased output power of the energy storage system.

[0329] When the output power of the new target system is greater than or equal to the total power, the output power of other inverters may be kept unchanged, so that the target system operates based on the output power of the new target system.

[0330] When the output power of the energy storage system increases to the maximum output power and the output power of the new target system is less than the total power, the output power of other inverters (i.e., the second system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0331] like Figure 7 As shown, for example, in the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and an oil engine (i.e., a power output system), and the photovoltaic system is not desired to output power, and the first system is the energy storage system and the second system is the oil engine, the output power of the energy storage system can be continuously increased.

[0332] In the process of increasing the output power of the energy storage system, if the energy storage system can satisfy the total power required for stable operation of the load without reaching the maximum output power, the output power of the energy storage system can be stopped from being increased.

[0333] The output power of the new target system can be obtained based on the increased output power of the energy storage system.

[0334] When the output power of the new target system is greater than or equal to the total power, the output power of the oil engine can be kept unchanged, so that the target system operates based on the output power of the new target system.

[0335] When the output power of the energy storage system increases to the maximum output power and the output power of the new target system is less than the total power, the output power of the oil engine (i.e., the second system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0336] For example, in the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and other inverters, and the photovoltaic system is not desired to output power, and the first system is other inverters and the second system is the energy storage system, the output power of other inverters can be adjusted preferentially to continuously increase the output power of other inverters.

[0337] In the process of increasing the output power of other inverters, if the total power required for stable operation of the load is not satisfied by the maximum output power of other inverters, increasing the output power of other inverters may be stopped.

[0338] The new target system output power can be obtained based on the increased output power of other inverters.

[0339] When the output power of the new target system is greater than or equal to the total power, the output power of the second system may be kept unchanged, so that the target system operates based on the output power of the new target system.

[0340] When the output power of other inverters increases to the maximum output power and the output power of the new target system is less than the total power, the output power of the energy storage system (i.e., the second system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0341] In the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and an oil engine, and the photovoltaic system is not desired to output power, and the first system is an oil engine and the second system is an energy storage system, the output power of the oil engine can be adjusted first to continuously increase the output power of the oil engine.

[0342] In the process of increasing the output power of the oil engine, if the oil engine does not reach the maximum output power to meet the total power required for stable operation of the load, the output power of the oil engine can be stopped from being increased.

[0343] The output power of the new target system can be obtained based on the increased output power of the oil engine.

[0344] When the output power of the new target system is greater than or equal to the total power, the output power of the second system may be kept unchanged, so that the target system operates based on the output power of the new target system.

[0345] When the output power of the oil engine increases to the maximum output power and the output power of the new target system is less than the total power, the output power of the energy storage system (i.e., the second system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0346] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of the new target system is obtained by increasing the output power of the first system, and it is determined whether the output power of the new target system can meet the total power required by the load. After the output power of the first system is increased to the maximum output power, if the output power of the new target system still does not meet the total power required by the load, the output power of the second system is further increased to increase the output power of the target system. There is no need to adjust the output power of each power supply system in the target system to the maximum output power under any circumstances, thereby improving energy utilization and reducing resource waste.

[0347] Second, the target system includes a photovoltaic system, an energy storage system, and a power output system, and when the photovoltaic system is allowed to output power, adjustments are made based on work priority.

[0348] like Figure 8 As shown, in some embodiments, based on the work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system may include:

[0349] When the target system includes a photovoltaic system, an energy storage system, and a power output system, increasing the output power of the first system with the highest priority among the photovoltaic system, the energy storage system, and the power output system;

[0350] Obtaining the output power of a new target system;

[0351] At least one of the output power of the second system and the output power of the third system is controlled based on the output power and the total power of the new target system.

[0352] In this embodiment, the second system is a system other than the first system among the photovoltaic system, the energy storage system and the power output system.

[0353] The third system is the system other than the first system and the second system among the photovoltaic system, the energy storage system and the power output system.

[0354] Taking the first system as a photovoltaic system as an example, the second system may be an energy storage system, and the third system may be a power output system.

[0355] Taking the first system as a photovoltaic system as an example, the second system can also be a power output system, and the third system can be an energy storage system.

[0356] like Figure 6 As shown, the power output system may be other inverters.

[0357] Continue to refer Figure 7 , the power output system can be a diesel engine.

[0358] like Fig.12 As shown, the power output system may also include other inverters and an oil generator.

[0359] For example, when the first system is a photovoltaic system, the second system may be an energy storage system or a power output system.

[0360] During the actual execution process, the output power of the photovoltaic system can be increased. After the output power of the photovoltaic system is increased, the output power of the target system will also change. The output power of the new target system can be obtained, and subsequent operations can be performed based on the correlation between the output power of the new target system and the total power.

[0361] In some embodiments, the correlation between the output power of the new target system and the total power can be compared in real time to determine whether to continue to increase the output power of the second system, that is, to increase the output power of the energy storage system or the output power of the power output system.

[0362] For example, when the first system is an energy storage system, the second system may be a photovoltaic system or a power output system.

[0363] In the actual execution process, the output power of the energy storage system can be increased. After the output power of the energy storage system is increased, the output power of the target system will also change. The output power of the new target system can be obtained, and subsequent operations can be performed based on the correlation between the output power of the new target system and the total power.

[0364] In some embodiments, the power output system may also include other inverters and oil engines, and when the output power of the power output system needs to be increased, the output power of other inverters may be increased first, or the output power of the oil engine may be increased first, or the output power of the oil engine and the output power of other inverters may be increased at the same time.

[0365] In this embodiment, the priority of increasing the output power of other inverters and the output power of the oil engine can be determined based on actual conditions, and this application does not limit it.

[0366] In some embodiments, the correlation between the output power of the new target system and the total power can be compared in real time to determine whether to continue to increase the output power of the second system, that is, to increase the output power of the photovoltaic system or the output power of the power output system.

[0367] For another example, when the first system is a power output system, the second system is an energy storage system or a photovoltaic system.

[0368] During the actual execution process, the output power of the power output system can be increased. After increasing the output power of the power output system, the output power of the target system will also change. The output power of the new target system can be obtained, and subsequent operations can be performed based on the correlation between the output power of the new target system and the total power.

[0369] In some embodiments, the correlation between the output power of the new target system and the total power can be compared in real time to determine whether to continue to increase the output power of the second system, that is, to increase the output power of the photovoltaic system or the output power of the energy storage system.

[0370] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of the first system with the highest priority among the photovoltaic system, the energy storage system and the power output system is increased, thereby increasing the output power of the target system, so that the output power of the target system can gradually meet the load demand. After increasing the output power of the first system, it is possible to determine whether to continue to increase the output power of the second system and the third system based on the correlation between the output power of the target system and the total load. There is no need to directly adjust the output power of the target system to the maximum output power. The output power of the target system can be reasonably adjusted to effectively save energy, reduce energy waste, and improve energy utilization.

[0371] In some embodiments, based on the output power and the total power of the new target system, controlling at least one of the output power of the second system and the output power of the third system may include:

[0372] When the output power of the new target system is greater than or equal to the total power, the output power of the second system and the output power of the third system are kept unchanged;

[0373] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is less than the total power, at least one of the output power of the second system and the output power of the third system is increased.

[0374] In this embodiment, during actual execution, when the output power of the new target system is greater than or equal to the total power, it is characterized that the output power of the new target system can enable the load to operate stably, and the target system can operate based on the output power of the new target system.

[0375] The output power of the first system may be increased to a maximum output power. After the output power of the first system is increased to the maximum output power, the output power of the new target system is determined based on the maximum output power of the first system.

[0376] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is still less than the total power required for stable operation of the load, one or more of the output power of the second system and the output power of the third system may be further increased.

[0377] For example, in the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and a power output system, and the first system is a photovoltaic system and the second system is an energy storage system or a power output system, the output power of the photovoltaic system can be adjusted preferentially to continuously increase the output power of the photovoltaic system.

[0378] In the process of increasing the output power of the photovoltaic system, if the photovoltaic system does not reach the maximum output power to meet the total power required for stable operation of the load, the output power of the energy storage system can be stopped from being increased.

[0379] The output power of a new target system can be obtained based on the increased output power of the photovoltaic system.

[0380] When the output power of the new target system is greater than or equal to the total power, the output power of the energy storage system and the output power of the power output system may be kept unchanged, so that the target system operates based on the output power of the new target system.

[0381] When the output power of the photovoltaic system increases to the maximum output power and the output power of the new target system is less than the total power, the output power of the energy storage system and one or more of the output powers of the power output system (i.e., the second system and the third system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0382] For example, in the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and a power output system, and the first system is the energy storage system and the second system is the photovoltaic system or the power output system, the output power of the energy storage system can be adjusted preferentially to continuously increase the output power of the energy storage system.

[0383] In the process of increasing the output power of the energy storage system, if the energy storage system can satisfy the total power required for stable operation of the load without reaching the maximum output power, the output power of the energy storage system can be stopped from being increased.

[0384] The output power of the new target system can be obtained based on the increased output power of the energy storage system.

[0385] When the output power of the new target system is greater than or equal to the total power, the output power of the photovoltaic system and the output power of the power output system may be kept unchanged, so that the target system operates based on the output power of the new target system.

[0386] When the output power of the energy storage system increases to the maximum output power and the output power of the new target system is less than the total power, the output power of the photovoltaic system and one or more of the output powers of the power output systems (i.e., the second system and the third system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0387] For example, in the actual implementation process, when the target system includes a photovoltaic system, an energy storage system and a power output system, and the first system is the power output system and the second system is the photovoltaic system or the energy storage system, the output power of the power output system can be adjusted preferentially to continuously increase the output power of the power output system.

[0388] In the process of increasing the output power of the power output system, if the power output system does not reach the maximum output power to satisfy the total power required for stable operation of the load, increasing the output power of the power output system may be stopped.

[0389] The output power of the new target system may be obtained based on the output power of the increased power output system.

[0390] When the output power of the new target system is greater than or equal to the total power, the output power of the photovoltaic system and the output power of the energy storage system can be kept unchanged, so that the target system operates based on the output power of the new target system.

[0391] When the output power of the power output system increases to the maximum output power and the output power of the new target system is less than the total power, one or more of the output power of the photovoltaic system and the output power of the energy storage system (i.e., the second system and the third system) can be further increased until the output power of the new target system is greater than or equal to the total power, so that the output power of the new target system meets the total power required for stable operation of the load.

[0392] In the actual execution process, whether to continue to adjust the output power of the target system may be determined based on the correlation between the output power of the new target system and the total power.

[0393] According to the adjustment method of the inverter system provided in the embodiment of the present application, the output power of the new target system is obtained by increasing the output power of the first system, and it is determined whether the output power of the new target system can meet the total power required by the load. If it does not meet the total power required by the load, the output power of the second system and the output power of the third system are further increased to increase the output power of the target system. The output power of the target system is flexibly adjusted based on the work priority to improve energy utilization and reduce energy waste.

[0394] In some embodiments, increasing at least one of the output power of the second system and the output power of the third system further includes:

[0395] Increasing the output power of the second system and obtaining the output power of a new target system;

[0396] When the output power of the new target system is greater than or equal to the total power, the output power of the third system is kept unchanged;

[0397] When the output power of the first system is adjusted to the maximum output power, the output power of the second system is adjusted to the maximum output power, and the output power of the new target system is less than the total power, the output power of the third system is increased.

[0398] In this embodiment, during the actual execution process, after increasing the output power of the second system, when the output power of the new target system is greater than or equal to the total power, it indicates that after adjusting the output power of the first system and the output power of the second system, the output power of the new target system can meet the total power required for stable operation of the load. At this time, the target system can be operated based on the output power of the new target system.

[0399] In the actual implementation process, if the output power of the target system obtained by increasing the output power of the first system to the maximum output power and increasing the output power of the second system to the maximum output power still cannot meet the total power required for stable operation of the load, the output power of the third system can be further increased.

[0400] When the first system is a photovoltaic system, the second system is an energy storage system, and the third system is a power output system, when the output power of the new target system is less than the total power, the output power of the power output system can be further increased until the output power of the new target system is greater than or equal to the total power.

[0401] When the first system is a photovoltaic system, the second system is a power output system, and the third system is an energy storage system, when the output power of the new target system is less than the total power, the output power of the energy storage system can be further increased until the output power of the new target system is greater than or equal to the total power.

[0402] When the first system is an energy storage system, the second system is a power output system, and the third system is a photovoltaic system, when the output power of the new target system is less than the total power, the output power of the photovoltaic system can be further increased until the output power of the new target system is greater than or equal to the total power.

[0403] When the first system is an energy storage system, the second system is a photovoltaic system, and the third system is a power output system, when the output power of the new target system is less than the total power, the output power of the power output system can be further increased until the output power of the new target system is greater than or equal to the total power.

[0404] When the first system is a power output system, the second system is an energy storage system, and the third system is a photovoltaic system, when the output power of the new target system is less than the total power, the output power of the photovoltaic system can be further increased until the output power of the new target system is greater than or equal to the total power.

[0405] When the first system is a power output system, the second system is a photovoltaic system, and the third system is an energy storage system, when the output power of the new target system is less than the total power, the output power of the energy storage system can be further increased until the output power of the new target system is greater than or equal to the total power.

[0406] For example, when the target system includes a photovoltaic system, an energy storage system and a power output system, and the first system is a photovoltaic system, the second system is an energy storage system, and the third system is a power output system, the output power of the photovoltaic system is preferentially adjusted to the maximum output power of the photovoltaic system, and the output power of the new target system is obtained.

[0407] When the output power of the new target system is less than the total power, the output power of the energy storage system continues to be increased.

[0408] When the output power of the new target system is calculated based on the sum of the maximum output power of the photovoltaic system and the maximum output power of the energy storage system, and the output power of the new target system is less than the total power, the output power of the power output system continues to be increased until the output power of the new target system meets the total power required for stable operation of the load.

[0409] Third, the target system includes a photovoltaic system and one of an energy storage system and a power output system, and is adjusted based on work priority.

[0410] In some embodiments, based on the work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system may include:

[0411] When the target system includes at least one of a photovoltaic system, an energy storage system, and a power output system, increasing the output power of a first system with the highest priority among the photovoltaic system, the energy storage system, and the power output system;

[0412] Obtaining the output power of a new target system;

[0413] Based on the output power and the total power of the new target system, the output power of the second system is controlled.

[0414] In this embodiment, if Figure 8As shown, when the target system includes a photovoltaic system and an energy storage system, and the first system is the photovoltaic system and the second system is the energy storage system, the output power of the photovoltaic system is increased preferentially.

[0415] Based on the increased output power of the photovoltaic system, a new target system output power is obtained.

[0416] Based on the correlation between the output power of the new target system and the total power, determine whether it is necessary to continue to increase the output power of the energy storage system.

[0417] When the target system includes a photovoltaic system and an energy storage system, and the first system is the energy storage system and the second system is the photovoltaic system, the output power of the energy storage system is increased preferentially.

[0418] Based on the increased output power of the energy storage system, a new target system output power is obtained.

[0419] Based on the correlation between the output power of the new target system and the total power, it is determined whether the output power of the photovoltaic system needs to be further increased.

[0420] When the target system includes a photovoltaic system and a power output system, and the first system is the photovoltaic system and the second system is the power output system, the output power of the photovoltaic system is increased preferentially.

[0421] Based on the increased output power of the photovoltaic system, a new target system output power is obtained.

[0422] Based on the correlation between the output power of the new target system and the total power, it is determined whether the output power of the power output system needs to be further increased.

[0423] like Fig. 9 As shown, the power output system may be other inverters.

[0424] like Fig.10 As shown, the power output system can be a diesel engine.

[0425] like Fig.13 As shown, the power output system may also include other inverters and oil engines. When the target system includes a photovoltaic system and a power output system, and the first system is the power output system, and the second system is the photovoltaic system, the output power of the power output system is increased first. Based on the increased output power of the power output system, the output power of the new target system is obtained.

[0426] Based on the correlation between the output power of the new target system and the total power, it is determined whether the output power of the photovoltaic system needs to be further increased.

[0427] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of each power supply system in the target system is increased by working priority, and the output power of the target system is flexibly adjusted to meet the power required for stable operation of the load, which can reduce energy waste, improve energy utilization and reduce costs.

[0428] In some embodiments, controlling the output power of the second system based on the output power and the total power of the new target system may include:

[0429] When the output power of the new target system is greater than or equal to the total power, the output power of the second system is kept unchanged;

[0430] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is less than the total power, the output power of the second system is increased.

[0431] In this embodiment, when the output power of the new target system is greater than or equal to the total power, it means that after the output power of the first system is increased, the output power of the new target system can meet the total power required for stable operation of the load. At this time, the target system can operate based on the output power of the new target system.

[0432] When the output power of the first system increases to the maximum output power and the output power of the new target system is less than the total power, it means that after the output power of the first system is increased to the maximum output power, the output power of the new target system still cannot meet the total power required for stable operation of the load. At this time, the output power of the second system can be further increased.

[0433] When the target system includes a photovoltaic system and a power output system, and the first system is the photovoltaic system and the second system is the power output system, when the output power of the new target system obtained by increasing the output power of the photovoltaic system to the maximum output power is less than the total power, the output power of the power output system continues to be increased until the output power of the new target system is greater than or equal to the total power.

[0434] When the target system includes a photovoltaic system and a power output system, and the first system is the power output system and the second system is the photovoltaic system, when the output power of the new target system obtained by increasing the output power of the power output system to the maximum output power is less than the total power, the output power of the photovoltaic system continues to be increased until the output power of the new target system is greater than or equal to the total power.

[0435] When the target system includes a photovoltaic system and an energy storage system, and the first system is a photovoltaic system and the second system is an energy storage system, when the output power of the new target system obtained by increasing the output power of the photovoltaic system to the maximum output power is less than the total power, the output power of the energy storage system continues to be increased until the output power of the new target system is greater than or equal to the total power.

[0436] When the target system includes a photovoltaic system and an energy storage system, and the first system is the energy storage system and the second system is the photovoltaic system, when the output power of the new target system obtained by increasing the output power of the energy storage system to the maximum output power is less than the total power, the output power of the photovoltaic system continues to be increased until the output power of the new target system is greater than or equal to the total power.

[0437] According to the detection method of the inverter system provided in the embodiment of the present application, by determining the correlation between the output power of the new target system and the total power, it is determined whether to continue to increase the output power of the target system, and the output power of the target system is flexibly adjusted in combination with the actual application scenario to reduce energy waste, improve energy utilization, and reduce costs.

[0438] Fourth, the target systems include photovoltaic systems, which are adjusted based on work priorities.

[0439] like Fig.11 As shown, in some embodiments, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system may include:

[0440] In the case where the target system includes a photovoltaic system, the output power of the photovoltaic system is increased.

[0441] In this embodiment, during the actual execution process, the output power of the photovoltaic system can be gradually increased, and the output power of the new target system can be determined based on the increased output power of the photovoltaic system, so that the output power of the new target system can meet the power required for stable operation of the load.

[0442] According to the detection method of the inverter system provided in the embodiment of the present application, the output power of the target system is effectively increased by gradually increasing the output power of the photovoltaic system, so that the output power of the new target system can support stable operation of the load and improve the safety of subsequent arc detection.

[0443] In some embodiments, performing arc detection on a faulty photovoltaic string in a photovoltaic system includes:

[0444] The output electrical signals of at least part of the at least one photovoltaic string included in the photovoltaic system are reduced to perform arc detection on the faulty photovoltaic string in the photovoltaic system.

[0445] In this embodiment, the electrical signal may be a signal such as current, voltage, and power.

[0446] The output electrical signal may be an output current.

[0447] The reduction range of the output electrical signal can be user-defined or determined based on actual conditions. For example, the output electrical signal can be reduced to 0 or 1, and the output electrical signal can also be reduced by 10 or 15 based on the current value. This application does not limit this.

[0448] In the actual implementation process, after adjusting the output power of the target system to ensure that each load can operate stably, the output electrical signal of at least part of the photovoltaic strings can be reduced, and based on the actual situation of the output electrical signal after the reduction, it is determined whether the faulty photovoltaic string generates an arc.

[0449] According to the detection method of the inverter system provided in the embodiment of the present application, by reducing the output electrical signal of the faulty photovoltaic string or reducing the output electrical signal of the faulty photovoltaic string and the photovoltaic strings within its target range, it is determined whether the faulty photovoltaic string generates an arc based on the actual situation of the reduced output electrical signal. The control logic is simple and easy to operate.

[0450] In some embodiments, reducing the output electrical signal of at least part of the at least one photovoltaic string included in the photovoltaic system to perform arc detection on a faulty photovoltaic string in the photovoltaic system may include:

[0451] When the output electrical signals of at least part of the photovoltaic strings decrease, collecting the decreased output electrical signals;

[0452] After acquiring the reduced output electrical signal, increasing the output electrical signal of at least part of the photovoltaic strings, and collecting the increased output electrical signal;

[0453] When the increased output electrical signal is greater than or equal to the decreased output electrical signal and / or the increased output electrical signal is greater than or equal to the electrical signal threshold, determining that the faulty photovoltaic string has not generated an arc;

[0454] When the increased output electrical signal is smaller than the decreased output electrical signal and / or the increased output electrical signal is smaller than the electrical signal threshold, it is determined that an arc is generated in the faulty photovoltaic string.

[0455] In this embodiment, the electrical signal threshold is a preset value for determining whether an arc is generated in a faulty photovoltaic string.

[0456] The specific value of the electrical signal threshold can be user-defined or determined based on actual conditions, and this application does not limit it.

[0457] In the actual implementation process, after reducing the output electrical signal of at least part of the photovoltaic strings, the output electrical signal after the reduction is collected to obtain the reduced output electrical signal; after obtaining the reduced output electrical signal, the output electrical signal is increased, and the output electrical signal after the increase is collected to obtain the increased output electrical signal.

[0458] Based on the correlation between the reduced output electrical signal and the increased output electrical signal, it is determined whether the faulty photovoltaic string actually generates an arc, so as to reduce the probability of false detection.

[0459] In some embodiments, when the increased output electrical signal is greater than or equal to the decreased output electrical signal, it is determined that the faulty photovoltaic string has not generated an arc.

[0460] When the increased output electrical signal is smaller than the decreased output electrical signal, it is determined that an arc is generated in the faulty photovoltaic string.

[0461] In other embodiments, when the increased output electrical signal is greater than or equal to the electrical signal threshold, it is determined that the faulty photovoltaic string has not generated an arc;

[0462] When the increased output electrical signal is less than the electrical signal threshold, it is determined that an arc is generated in the faulty photovoltaic string.

[0463] For example, the output electrical signal can be reduced to 1 and then increased. When the output electrical signal can be increased (that is, the increased output electrical signal is greater than or equal to 1), it indicates that no arc is generated in the connection between the faulty photovoltaic string and the inverter system, and the faulty photovoltaic string is falsely detected.

[0464] When the output electrical signal cannot be increased, it indicates that an arc is generated in the connection between the faulty PV string and the inverter system, and the arc detection result of the faulty PV string is correct.

[0465] According to the detection method of the inverter system provided in the embodiment of the present application, by obtaining a reduced output electrical signal and further increasing the output electrical signal, the increased output electrical signal is compared with the reduced output electrical signal or the electrical signal threshold, to determine whether the faulty photovoltaic string is falsely detected, reduce the occurrence of false detection of faulty photovoltaic strings, improve the accuracy of detection, timely discover faults in the inverter system, and improve the safety of the inverter system.

[0466] The detection method of the inverter system provided in the embodiment of the present application may be executed by a detection device of the inverter system. In the embodiment of the present application, the detection device of the inverter system executing the detection method of the inverter system is taken as an example to illustrate the detection device of the inverter system provided in the embodiment of the present application.

[0467] An embodiment of the present application also provides a detection device for an inverter system.

[0468] The inverter system is electrically connected to the photovoltaic system and at least one load respectively.

[0469] The photovoltaic system includes at least one photovoltaic string.

[0470] like Fig.14 As shown, the detection device of the inverter system includes: a first processing module 1410 and a second processing module 1420 .

[0471] The first processing module 1410 is used to obtain the output power corresponding to the target system connected to at least one load; the target system is used to supply power to the at least one load; the target system includes a photovoltaic system;

[0472] The second processing module 1420 is configured to perform arc detection on a faulty photovoltaic string in the photovoltaic system based on the output power and the total power corresponding to the at least one load.

[0473] According to the detection device of the inverter system provided in the embodiment of the present application, the output power of the target system that supplies power to the load is obtained, and arc detection is performed based on the output power and the total power corresponding to each load. The stability of the load operation during the arc detection process is ensured, the impact of the reduction in the output power of the inverter system on the load operation is alleviated, the performance of the load is improved and the service life of the load is extended, the safety hazards caused by unstable operation of the load are reduced, and the user experience is improved.

[0474] In some embodiments, the second processing module 1420 may also be used to:

[0475] When the output power corresponding to the target system is greater than or equal to the total power, arc detection is performed on the faulty photovoltaic strings in the photovoltaic system.

[0476] In some embodiments, the second processing module 1420 may also be used to:

[0477] When the output power corresponding to the target system is less than the total power, a non-critical load in at least one load is cut off; the non-critical load is preset;

[0478] When the output power corresponding to the target system is greater than or equal to the total power corresponding to the critical loads other than the non-critical loads in at least one load, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

[0479] In some embodiments, the non-critical load includes: at least one of a DC side non-critical load and an AC side non-critical load, and the second processing module 1420 may also be used for:

[0480] Based on the disconnection priorities corresponding to the non-critical loads on the DC side and the disconnection priorities corresponding to the non-critical loads on the AC side, the non-critical loads in at least one load are disconnected until the output power corresponding to the target system is greater than or equal to the new total power.

[0481] In some embodiments, the second processing module 1420 may also be used to:

[0482] Cut off the non-critical loads on the DC side and the non-critical loads on the AC side in turn, and cut off the non-critical loads on the target side with a high priority, and obtain a new total power;

[0483] When the output power corresponding to the target system is greater than or equal to the new total power, the cutting operation is stopped;

[0484] When all loads on the target side are cut off and the output power corresponding to the target system is less than the new total power, non-critical loads on the other side except the target side are cut off in turn until the output power corresponding to the target system is greater than or equal to the new total power.

[0485] In some embodiments, the second processing module 1420 may also be used to:

[0486] When the target system includes at least one of a photovoltaic system, an energy storage system and a power output system, and the photovoltaic system includes one photovoltaic string, a non-critical load in at least one load is disconnected based on a disconnection priority.

[0487] In some embodiments, the second processing module 1420 may also be used to:

[0488] When the target system includes a photovoltaic system, and the photovoltaic system includes a plurality of photovoltaic strings, a non-critical load among the at least one load is disconnected based on a disconnection priority.

[0489] In some embodiments, the second processing module 1420 may also be used to:

[0490] Based on the target work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system;

[0491] Perform arc detection on faulty PV strings in PV systems.

[0492] In some embodiments, the second processing module 1420 may also be used to:

[0493] When the target system includes a photovoltaic system, an energy storage system, and a power output system, and the photovoltaic system is not allowed to output power, increasing the output power of the first system with the highest priority among the energy storage system and the power output system;

[0494] Obtaining the output power of a new target system;

[0495] Based on the output power and total power of the new target system, the output power of the second system is controlled; the second system is the system other than the first system in the energy storage system and the power output system.

[0496] In some embodiments, the second processing module 1420 may also be used to:

[0497] When the output power of the new target system is greater than or equal to the total power, the output power of the second system is kept unchanged;

[0498] When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is less than the total power, the output power of the second system is increased.

[0499] In some embodiments, the second processing module 1420 may also be used to:

[0500] The output electrical signals of at least part of the at least one photovoltaic string included in the photovoltaic system are reduced to perform arc detection on the faulty photovoltaic string in the photovoltaic system.

[0501] In some embodiments, the second processing module 1420 may also be used to:

[0502] When the output electrical signals of at least part of the photovoltaic strings decrease, collecting the decreased output electrical signals;

[0503] After acquiring the reduced output electrical signal, increasing the output electrical signal of at least part of the photovoltaic strings, and collecting the increased output electrical signal;

[0504] When the increased output electrical signal is greater than or equal to the decreased output electrical signal and / or the increased output electrical signal is greater than or equal to the electrical signal threshold, determining that the faulty photovoltaic string has not generated an arc;

[0505] When the increased output electrical signal is smaller than the decreased output electrical signal and / or the increased output electrical signal is smaller than the electrical signal threshold, it is determined that an arc is generated in the faulty photovoltaic string.

[0506] The detection device of the inverter system in the embodiment of the present application may be an inverter system, or may be an electronic device connected to the inverter system for communication, or may be a component in the inverter system or the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than the terminal. Exemplarily, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and may also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0507] The detection device of the inverter system in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0508] The detection device of the inverter system provided in the embodiment of the present application can achieve Figures 1 to 13 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0509] An embodiment of the present application also provides an inverter system.

[0510] In some embodiments, the inverter system is detected based on the detection method of the inverter system described in any of the above embodiments.

[0511] According to the inverter system provided in the embodiment of the present application, the output power of the target system that supplies power to the load is obtained, and arc detection is performed based on the output power and the total power corresponding to each load. The stability of the load operation during the arc detection process is ensured, the impact of the reduction in the output power of the inverter system on the load operation is alleviated, the performance of the load is improved and the service life of the load is extended, the safety hazards caused by unstable load operation are reduced, and the user experience is improved.

[0512] In some embodiments, Fig.15As shown, an embodiment of the present application also provides an electronic device 1500, including a processor 1501, a memory 1502, and a computer program stored in the memory 1502 and executable on the processor 1501. When the program is executed by the processor 1501, each process of the detection method embodiment of the above-mentioned inverter system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0513] 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.

[0514] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned inverter system detection method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0515] The processor is the 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.

[0516] An embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned detection method of the inverter system when executed by a processor.

[0517] The processor is the 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.

[0518] 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 inverter system detection method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0519] 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.

[0520] 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.

[0521] 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 relevant technology, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, disk, CD), and includes a number of instructions for a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0522] 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.

[0523] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0524] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A detection method for an inverter system, characterized in that: The inverter system is electrically connected to a photovoltaic system and at least one load respectively, and the photovoltaic system includes at least one photovoltaic string; the method includes: Acquire a maximum output power corresponding to a target system connected to the at least one load, an output power relatively close to the maximum output power corresponding to the target system, or a user-defined output power; the target system is used to supply power to the at least one load; the target system includes the photovoltaic system; Performing arc detection on a faulty photovoltaic string in the photovoltaic system based on the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the total power corresponding to the user-defined output power and the at least one load; The arc detection of a faulty photovoltaic string in the photovoltaic system based on the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the total power corresponding to the user-defined output power and the at least one load includes: When the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the total power, performing arc detection on the faulty photovoltaic string in the photovoltaic system; or, When the maximum output power corresponding to the target system, the output power close to the maximum output power corresponding to the target system, or the user-defined output power is less than the total power, cutting off a non-critical load in the at least one load; the non-critical load is preset; When the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the total power corresponding to the critical loads excluding the non-critical loads in the at least one load, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

2. The detection method of the inverter system according to claim 1, characterized in that: In the case where the target system also includes at least one of an energy storage system and a power output system, the maximum output power corresponding to the target system, the output power that is relatively close to the maximum output power corresponding to the target system, or the user-defined output power is the sum of at least one of the maximum output power corresponding to the photovoltaic system and the maximum output power corresponding to the energy storage system and the maximum output power corresponding to the power output system.

3. The detection method of the inverter system according to claim 1, characterized in that: When the target system is the photovoltaic system and the photovoltaic system includes multiple photovoltaic strings, the maximum output power corresponding to the target system, the output power that is relatively close to the maximum output power corresponding to the target system, or the user-defined output power is the sum of the maximum output powers corresponding to the first part of the multiple photovoltaic strings included in the photovoltaic system; the first part of the photovoltaic strings are the remaining photovoltaic strings among the multiple photovoltaic strings except at least part of the photovoltaic strings; and the at least part of the photovoltaic strings include the faulty photovoltaic strings.

4. The detection method of the inverter system according to claim 3, characterized in that: The at least part of the photovoltaic strings includes the faulty photovoltaic string and at least one photovoltaic string located within a target range of the faulty photovoltaic string.

5. The detection method of the inverter system according to any one of claims 1 to 4, characterized in that: The non-critical load includes: at least one of a DC side non-critical load and an AC side non-critical load, and the step of cutting off the non-critical load in the at least one load includes: Based on the cutoff priority corresponding to the non-critical load on the DC side and the cutoff priority corresponding to the non-critical load on the AC side, the non-critical load in the at least one load is cut off until the maximum output power corresponding to the target system, the output power that is close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the new total power.

6. The detection method of the inverter system according to claim 5, characterized in that: The method of cutting off the non-critical load in the at least one load based on the cutting off priority corresponding to the non-critical load on the DC side and the cutting off priority corresponding to the non-critical load on the AC side until the maximum output power corresponding to the target system, the output power close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the new total power includes: Sequentially disconnecting the non-critical loads on the DC side and the non-critical loads on the AC side with a high disconnection priority, and obtaining a new total power; When the maximum output power corresponding to the target system, the output power close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the new total power, stopping the cutting operation; When all loads on the target side are cut off and the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the user-defined output power is less than the new total power, non-critical loads on the other side except the target side are cut off in sequence until the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the new total power.

7. The detection method of the inverter system according to claim 5, characterized in that: The step of cutting off the non-critical load in the at least one load based on the cutting off priority corresponding to the non-critical load on the DC side and the cutting off priority corresponding to the non-critical load on the AC side includes: When the target system includes the photovoltaic system and at least one of an energy storage system and a power output system, and the photovoltaic system includes one photovoltaic string, the non-critical load in the at least one load is disconnected based on the disconnection priority.

8. The detection method of the inverter system according to claim 5, characterized in that: The step of cutting off the non-critical load in the at least one load based on the cutting off priority corresponding to the non-critical load on the DC side and the cutting off priority corresponding to the non-critical load on the AC side includes: When the target system includes a photovoltaic system, and the photovoltaic system includes a plurality of photovoltaic strings, the non-critical load in the at least one load is disconnected based on the disconnection priority.

9. The detection method of the inverter system according to any one of claims 1 to 4, characterized in that: The performing arc detection on a faulty photovoltaic string in the photovoltaic system comprises: Based on the work priority, adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system; When the target system after adjustment is capable of stably operating the load, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

10. The detection method of the inverter system according to claim 9, characterized in that: The step of adjusting at least one of the output power of the photovoltaic system, the output power of the energy storage system, and the output power of the power output system included in the target system based on the work priority includes: When the target system includes the photovoltaic system, the energy storage system and the power output system, and the photovoltaic system is not allowed to output power, increasing the output power of the first system with the highest priority among the energy storage system and the power output system; Obtaining the output power of a new target system; Based on the output power of the new target system and the total power, the output power of a second system is controlled; the second system is a system other than the first system in the energy storage system and the power output system.

11. The detection method of the inverter system according to claim 10, characterized in that: The controlling the output power of the second system based on the output power of the new target system and the total power includes: When the output power of the new target system is greater than or equal to the total power, maintaining the output power of the second system unchanged; When the output power of the first system is adjusted to the maximum output power and the output power of the new target system is less than the total power, the output power of the second system is increased.

12. The detection method of the inverter system according to claim 9, characterized in that: The performing arc detection on the faulty photovoltaic string in the photovoltaic system comprises: The output electrical signals of at least part of the at least one photovoltaic string included in the photovoltaic system are reduced to perform arc detection on the faulty photovoltaic string in the photovoltaic system.

13. The detection method of the inverter system according to claim 12, characterized in that: The step of reducing the output electrical signal of at least part of the at least one photovoltaic string included in the photovoltaic system to perform arc detection on the faulty photovoltaic string in the photovoltaic system comprises: When the output electrical signal of at least part of the photovoltaic strings decreases, collecting the decreased output electrical signal; After acquiring the reduced output electrical signal, increasing the output electrical signal of at least part of the photovoltaic strings, and collecting the increased output electrical signal; In the case where the increased output electrical signal is greater than or equal to the decreased output electrical signal or the increased output electrical signal is greater than or equal to an electrical signal threshold, determining that the faulty photovoltaic string does not generate an arc; When the increased output electrical signal is smaller than the decreased output electrical signal and / or the increased output electrical signal is smaller than an electrical signal threshold, it is determined that an electric arc is generated in the faulty photovoltaic string.

14. A detection device for an inverter system, characterized in that: The inverter system is electrically connected to a photovoltaic system and at least one load respectively, the photovoltaic system includes a plurality of photovoltaic strings, and the inverter system is used to be electrically connected to an energy storage system and a power output system; the device includes: A first processing module is used to obtain a maximum output power corresponding to a target system connected to the at least one load, an output power relatively close to the maximum output power corresponding to the target system, or an output power defined by a user; the target system is used to supply power to the at least one load; the target system includes the photovoltaic system; A second processing module is used to perform arc detection on a faulty photovoltaic string in the photovoltaic system based on the maximum output power corresponding to the target system, the output power that is relatively close to the maximum output power corresponding to the target system, or the total power corresponding to the user-defined output power and the at least one load; The second processing module is used to: When the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the total power, performing arc detection on the faulty photovoltaic string in the photovoltaic system; or, When the maximum output power corresponding to the target system, the output power close to the maximum output power corresponding to the target system, or the user-defined output power is less than the total power, cutting off a non-critical load in the at least one load; the non-critical load is preset; When the maximum output power corresponding to the target system, the output power relatively close to the maximum output power corresponding to the target system, or the user-defined output power is greater than or equal to the total power corresponding to the critical loads excluding the non-critical loads in the at least one load, arc detection is performed on the faulty photovoltaic string in the photovoltaic system.

15. An inverter system, characterized in that: The inverter system is detected based on the detection method of the inverter system according to any one of claims 1 to 13.

16. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the detection method of the inverter system as described in any one of claims 1 to 13 is implemented.

17. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the detection method of the inverter system according to any one of claims 1 to 13 is implemented.

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