PV arc detection and processing method and device

Abstract

This application relates to a PV arc detection and processing method and device. The method detects whether a PV inverter is in an arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, the method detects whether the inverter is in a boosting state. If so, the PV arc extinguishing action is performed. After the PV arc extinguishing action is completed, if the PV output recovers, it is determined that no PV fault arc has occurred; otherwise, it is determined that a PV fault arc has occurred. Based on this, whether a detected arc is a PV fault arc is determined by the arc shielding state setting of the PV inverter and the recovery of the PV output in the boosting state, effectively reducing the probability of misjudgment of an arc.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic inverters, and in particular to a PV arc detection and processing method and device. Background Art

[0002] Photovoltaic (PV) refers to systems that use semiconductor materials to convert light energy into electricity, creating the photovoltaic effect. The resulting industrial product is the photovoltaic panel. PV panels absorb sunlight and convert solar radiation directly or indirectly into electricity through the photoelectric or photochemical effects. This electricity is then converted by a photovoltaic inverter and output to loads such as the power grid or energy storage. During this process, arcing can occur, impacting the normal operation of the PV system and even causing fires and other malfunctions. Therefore, PV systems are typically equipped with an arc detection device (ARC) to identify arcs and implement timely risk management.

[0003] Currently, PV arc detection methods in PV systems are generally based on frequency-domain FFT (fast Fourier transform) methods, which observe changes in the amplitude of a certain frequency spectrum before and after an arc occurs to determine whether an arc has occurred. However, since PV inverters are generally non-isolated, fluctuations in the voltage, current, and power of the on-site PV DC, inverter AC output, and grid voltage are inevitable. These fluctuations can affect the FFT analysis results, leading to false arc fault alarms in the arc detection device. Summary of the Invention

[0004] Based on this, to address the problem that the inevitable fluctuations in PV DC, inverter AC output, and grid voltage, current, and power in photovoltaic inverters can affect the FFT analysis results, thereby causing false alarms of arc faults in arc detection devices, the embodiments of the present disclosure provide a PV arc detection and processing method and device.

[0005] The present disclosure provides a PV arc detection and processing method, including the following steps:

[0006] Detect whether the photovoltaic inverter is in arc shielding state and detect whether an arc occurs;

[0007] If an arc is detected when the photovoltaic inverter is not in an arc shielding state, detecting whether it is in a boost state;

[0008] If it is in the boost state, execute the PV arc extinguishing action;

[0009] After the PV arc extinguishing action is completed, if the PV output is restored, it is determined that no PV fault arc occurs; otherwise, it is determined that a PV fault arc occurs.

[0010] The PV arc detection and processing method of the disclosed embodiment detects whether the PV inverter is in an arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, the method detects whether the inverter is in a boosting state. If so, the method performs a PV arc extinguishing action. After the PV arc extinguishing action is completed, if the PV output recovers, it is determined that no PV fault arc has occurred; otherwise, it is determined that a PV fault arc has occurred. Based on this, the arc shielding state setting of the PV inverter and the recovery of the PV output in the boosting state are used to determine whether the detected arc is a PV fault arc, effectively reducing the probability of false arc detection.

[0011] As one of the optional embodiments, the method further includes the steps of:

[0012] If it is not in the boost state, it is determined that a PV fault arc has occurred.

[0013] As one of the optional embodiments, the method further includes the steps of:

[0014] If the photovoltaic inverter is in an arc shielding state, the arc detection result is ignored.

[0015] As one of the optional embodiments, if an arc is detected when the photovoltaic inverter is not in the arc shielding state, the process of detecting whether it is in the boost state includes the steps of:

[0016] If the photovoltaic inverter is not in the arc shielding state for a duration not exceeding the delay time, an arc is detected, and whether the photovoltaic inverter is in the boosting state is detected.

[0017] As one of the optional embodiments, the process of detecting whether the photovoltaic inverter is in the arc shielding state includes the steps of:

[0018] detecting an operating state, PV current, inverter power and / or PV power of the photovoltaic inverter;

[0019] Whether the photovoltaic inverter is in an arc shielding state is determined according to the working state, PV current change, inverter power and / or PV power.

[0020] As one of the optional embodiments, the process of determining whether the photovoltaic inverter is in the arc shielding state according to the working state, PV current change, inverter power and / or PV power includes the steps of:

[0021] When the working state is the set state, the PV current change is greater than the set current, or the set power has a sudden change, it is determined that the photovoltaic inverter is in the arc shielding state; otherwise, the photovoltaic inverter is not in the arc shielding state; the set state includes a soft start state, a fast tracking state, or a power limit state; the set power includes inverter power and / or PV power.

[0022] As one of the optional embodiments, the process of determining whether the photovoltaic inverter is in the arc shielding state according to the working state, PV current change, inverter power and / or PV power includes the steps of:

[0023] When the working state is a soft start state or a fast tracking state, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the PV current change is greater than a set current;

[0024] When the PV current change is greater than a set current, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the working state is a power limiting state;

[0025] When the working state is the power-limited state, it is determined that the photovoltaic inverter is in the arc shielding state; otherwise, it is determined whether the set power changes suddenly; wherein the set power includes inverter power and / or PV power.

[0026] When the set power suddenly changes, it is determined that the photovoltaic inverter is in the arc shielding state; otherwise, it is determined that the photovoltaic inverter is not in the arc shielding state.

[0027] The present disclosure also provides a PV arc detection and processing device, including:

[0028] A signal detection module is used to detect whether the photovoltaic inverter is in an arc shielding state and whether an arc occurs;

[0029] a boost detection module, configured to detect an arc when the photovoltaic inverter is not in an arc shielding state, and detect whether it is in a boost state;

[0030] Arc extinguishing execution module, used to execute PV arc extinguishing action in the boost state;

[0031] The fault judgment module is used to determine that no PV fault arc occurs if the PV output is restored after the PV arc extinguishing action is completed, and otherwise determine that a PV fault arc occurs.

[0032] The PV arc detection and processing device of the disclosed embodiment detects whether the PV inverter is in the arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, the device detects whether the inverter is in the boosting state. If so, the device performs a PV arc extinguishing action. After the PV arc extinguishing action is completed, if the PV output recovers, the device determines that no PV fault arc has occurred; otherwise, the device determines that a PV fault arc has occurred. Based on this, the detection of whether a detected arc is a PV fault arc is determined by the PV inverter's arc shielding state setting and the PV output recovery status in the boosting state, effectively reducing the probability of false arc detection.

[0033] At least one embodiment of the present disclosure further provides a data control device, including:

[0034] one or more memories non-transitorily storing computer-executable instructions;

[0035] One or more processors are configured to execute computer-executable instructions, wherein the computer-executable instructions, when executed by the one or more processors, implement the PV arc detection processing method according to any embodiment of the present disclosure.

[0036] The data control device detects whether the PV inverter is in the arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, it then detects whether the inverter is in the boosting state. If so, it performs a PV arc extinguishing action. After the PV arc extinguishing action is completed, if the PV output recovers, it is determined that no PV fault arc has occurred; otherwise, it is determined that a PV fault arc has occurred. Based on this, the arc shielding state setting of the PV inverter and the recovery of the PV output in the boosting state are used to determine whether the detected arc is a PV fault arc, effectively reducing the probability of false arc detection.

[0037] At least one embodiment of the present disclosure further provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the PV arc detection processing method according to any embodiment of the present disclosure is implemented.

[0038] The aforementioned non-transitory computer-readable storage medium detects whether the PV inverter is in an arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, the system then detects whether the inverter is in a boosting state. If so, the system performs a PV arc extinguishing action. After the PV arc extinguishing action is completed, if the PV output recovers, the system determines that no PV fault arc has occurred; otherwise, the system determines that a PV fault arc has occurred. Based on this, the determination of whether a detected arc is a PV fault arc is based on the PV inverter's arc shielding state setting and the PV output recovery status in the boosting state, effectively reducing the probability of false arc detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flowchart of a PV arc detection and processing method according to a disclosed embodiment;

[0040] Figure 2 is a flow chart of a PV arc detection and processing method according to a preferred embodiment;

[0041] Figure 3 A flowchart of arc shielding status determination according to a disclosed embodiment;

[0042] Figure 4 A flowchart of arc shielding status determination according to another disclosed embodiment;

[0043] Figure 5 This is a flowchart for determining arc shielding status in practical applications;

[0044] Figure 6 Flowchart of the PV arc detection and processing method for practical application;

[0045] Figure 7 A block diagram of a PV arc detection and processing device according to a disclosed embodiment;

[0046] Figure 8 A schematic block diagram of a data control device provided for at least one embodiment of the present disclosure;

[0047] Figure 9 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0049] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0050] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of some known functions and components.

[0051] The embodiments of the present disclosure provide a PV arc detection and processing method.

[0052] Figure 1 FIG. 1 is a flow chart of a PV arc detection processing method according to a disclosed embodiment. Figure 1 As shown, a PV arc detection and processing method according to a disclosed embodiment includes steps S100 to S103:

[0053] S100, detecting whether the photovoltaic inverter is in an arc shielding state and detecting whether an arc occurs;

[0054] S101, if an arc is detected when the photovoltaic inverter is not in an arc shielding state, detecting whether it is in a boost state;

[0055] S102, if in boost state, execute PV arc extinguishing action;

[0056] S103 , after the PV arc extinguishing action is completed, if the PV output is restored, it is determined that no PV fault arc occurs; otherwise, it is determined that a PV fault arc occurs.

[0057] The PV arc detection and processing method disclosed in the present disclosure is applied to a photovoltaic system comprising a photovoltaic inverter and associated auxiliary circuitry. The auxiliary circuitry includes a boost circuit, an arc detection device (ARC), and an inverter management system. The arc detection device (ARC) can be used to detect arcing. The boost circuit, associated with the photovoltaic inverter, boosts the PV output voltage.

[0058] The execution body of the PV arc detection processing method of the embodiment of the present disclosure may be attached to the arc detection device ARC or the inverter management system, and perform direct or indirect information interaction with various hardware in the photovoltaic system.

[0059] First, detect whether the photovoltaic inverter is in the arc shielding state. When the photovoltaic inverter is in the arc shielding state, there is no arc or the arc is meaningless, and whether the arc detection result is a misjudgment is also meaningless.

[0060] Based on this, Figure 1 As shown, the PV arc detection and processing method of a disclosed embodiment further includes step S104:

[0061] S104: If the photovoltaic inverter is in an arc shielding state, ignoring the arc detection result.

[0062] If the PV inverter is not in arc shielding state, if it is detected in boost state, it means that the BOOST boost circuit is started. If an arc occurs and the BOOST boost circuit is not in the start state, it means that the arc is not a false positive, but a fault arc. Based on this, if Figure 1 As shown, the PV arc detection and processing method of a disclosed embodiment further includes step S105:

[0063] S105: If the voltage is not in the boost state, it is determined that a PV fault arc occurs.

[0064] According to the selection and working requirement of the photovoltaic inverter, the characteristic signal judgment condition of the arc shielding state can be designed. As a preferred embodiment, Figure 2 FIG. 1 is a flow chart of a PV arc detection processing method according to a preferred embodiment. Figure 2 As shown, the process of detecting whether the photovoltaic inverter is in the arc shielding state in step S100 includes steps S200 and S201:

[0065] S200, detecting the working state, PV current, inverter power and PV power of the photovoltaic inverter;

[0066] S201 : Determine whether the photovoltaic inverter is in an arc shielding state according to the working state, PV current change, inverter power and / or PV power.

[0067] The working state of the photovoltaic inverter, PV current, inverter power and PV power are used as characteristic signals of the arc shielding state to perform state judgment.

[0068] As one example, Figure 3 FIG. 1 is a flow chart of arc shielding status determination according to a disclosed embodiment. Figure 3As shown, the process of determining whether the photovoltaic inverter is in the arc shielding state according to the working state, PV current change, inverter power and / or PV power in step S201 includes step S300:

[0069] S300, when the working state is the set state, the PV current change is greater than the set current or the set power has a sudden change, it is determined that the photovoltaic inverter is in the arc shielding state, otherwise the photovoltaic inverter is not in the arc shielding state; the set state includes a soft start state, a fast tracking state or a power limit state; the set power includes inverter power and / or PV power.

[0070] like Figure 3 As shown, characteristic signals of the arc shielding state include operating state, PV current change, inverter power, and / or PV power. One of these characteristic signals is selected. When any characteristic signal satisfies the conditions set in step S300, the PV inverter is determined to be in the arc shielding state. When all characteristic signals do not satisfy the conditions set in step S300, the PV inverter is determined not to be in the arc shielding state.

[0071] As another embodiment, Figure 4 FIG. 1 is a flow chart for determining the arc shielding state of another disclosed embodiment, as shown in FIG. Figure 4 As shown, the process of determining whether the photovoltaic inverter is in the arc shielding state according to the working state, PV current change, inverter power and / or PV power in step S201 includes steps S400 to S403:

[0072] S400, when the working state is a soft start state or a fast tracking state, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the PV current change is greater than a set current;

[0073] S401, when the PV current change is greater than a set current, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the working state is a power limiting state;

[0074] S402, when the working state is the power-limited state, determining that the photovoltaic inverter is in the arc shielding state, otherwise determining whether the set power changes suddenly; wherein the set power includes inverter power and / or PV power.

[0075] S403: When the set power suddenly changes, determine that the photovoltaic inverter is in an arc shielding state; otherwise, determine that the photovoltaic inverter is not in an arc shielding state.

[0076] The current is set to 2-4A; preferably, the current is set to 3A.

[0077] In step S400 to step S403, the characteristic signal is determined in a progressive manner, which can effectively reduce the amount of data processing for determining the arc shielding state and facilitate rapid determination of the arc shielding state.

[0078] The purpose of quickly determining the arc shielding state is to improve the reference value of arc detection and processing within the delay time. Figure 2 As shown, in step S101, if an arc is detected when the photovoltaic inverter is not in the arc shielding state, the process of detecting whether it is in the boost state includes step S202:

[0079] S202: If an arc is detected when the photovoltaic inverter is not in the arc shielding state for a duration not exceeding a delay time, it is detected whether the photovoltaic inverter is in a boost state.

[0080] The delay time is 3-6s; preferably, the delay time is 4.5s.

[0081] Each time an arc shielding state is detected, if the arc shielding state exceeds a certain time, the characteristic signal may change, causing the detection result to be invalid.

[0082] Preferably, in practical applications, Figure 5 This is a flowchart for determining the arc shielding status in actual application, such as Figure 5 As shown, the mask signal MaskFlag is set to "1" to indicate the existence of an arc shielding state. When the delay time is reached, the mask signal MaskFlag is cleared and the result is replaced by a new detection.

[0083] Figure 6 The flowchart of the PV arc detection processing method for practical application is as follows: Figure 6 As shown, when the mask signal MaskFlag is set to "0", it indicates that it is not in the arc shielding state. When the mask signal MaskFlag is set to "1", it indicates that it is set and in the arc shielding state. Figure 4 The judgment method shown shortens the data processing amount to quickly judge the arc shielding status and cooperates with the delay time, which can effectively reduce the false alarm rate.

[0084] like Figure 6 As shown, after a true arc strikes the PV, the PV will be burned out after the arc is extinguished, and this PV input will no longer exist. Therefore, based on this characteristic, it is possible to stop the chopping current in boost mode and then resume it to observe whether the PV output channel can resume continuous output to determine whether a true arc has occurred. Combining these solutions can greatly reduce the possibility of false arc fault diagnosis.

[0085] The PV arc detection and processing method of any embodiment of the present disclosure detects whether the PV inverter is in an arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, the method detects whether the inverter is in a boosting state. If so, the method performs a PV arc extinguishing action. After the PV arc extinguishing action is completed, if the PV output recovers, it is determined that no PV fault arc has occurred; otherwise, it is determined that a PV fault arc has occurred. Based on this, whether a detected arc is a PV fault arc is determined by the arc shielding state setting of the PV inverter and the recovery of the PV output in the boosting state, effectively reducing the probability of false arc detection.

[0086] The embodiments of the present disclosure also provide a PV arc detection and processing device.

[0087] Figure 7 FIG. 1 is a block diagram of a PV arc detection and processing device according to a disclosed embodiment. Figure 7 As shown, a PV arc detection and processing device according to one embodiment includes:

[0088] The signal detection module 100 is used to detect whether the photovoltaic inverter is in an arc shielding state and whether an arc occurs;

[0089] A boost detection module 101 is configured to detect an arc when the photovoltaic inverter is not in an arc shielding state and detect whether it is in a boost state;

[0090] The arc extinguishing execution module 102 is used to execute the PV arc extinguishing action in the boost state;

[0091] The fault judgment module 103 is configured to determine that no PV arc fault occurs if the PV output is restored after the PV arc extinguishing action is completed, and otherwise determine that a PV arc fault occurs.

[0092] The PV arc detection and processing device of the disclosed embodiment detects whether the PV inverter is in the arc shielding state and whether an arc has occurred. If an arc is detected when the PV inverter is not in the arc shielding state, the device detects whether the inverter is in the boosting state. If so, the device performs a PV arc extinguishing action. After the PV arc extinguishing action is completed, if the PV output recovers, the device determines that no PV fault arc has occurred; otherwise, the device determines that a PV fault arc has occurred. Based on this, the detection of whether a detected arc is a PV fault arc is determined by the PV inverter's arc shielding state setting and the PV output recovery status in the boosting state, effectively reducing the probability of false arc detection.

[0093] At least one embodiment of the present disclosure further provides a data control device. Figure 8 A schematic block diagram of a data control device provided by at least one embodiment of the present disclosure. Figure 8As shown, the data control device 20 may include one or more memories 200 and one or more processors 201. The memories 200 are used to non-transitorily store computer-executable instructions; the processor 201 is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor 201, the processor 201 may execute one or more steps of the PV arc detection processing method according to any embodiment of the present disclosure.

[0094] The specific implementation and related explanation of each step of the PV arc detection and processing method can be found in the relevant content of the embodiment of the PV arc detection and processing method above, which will not be repeated here. Figure 8 The components of the data control device 20 shown are merely exemplary and non-limiting. The data control device 20 may further include other components according to actual application requirements.

[0095] In one embodiment, the processor 201 and the memory 200 can communicate with each other directly or indirectly. For example, the processor 201 and the memory 200 can communicate via a network connection. The network can include a wireless network, a wired network, and / or any combination of a wireless network and a wired network. The present disclosure does not limit the type and function of the network. For another example, the processor 201 and the memory 200 can also communicate via a bus connection. The bus can be a peripheral component interconnect standard (PCI) bus or an extended industrial standard architecture (EISA) bus, etc. For example, the processor 201 and the memory 200 can be set at a remote data server end (cloud) or a distributed energy system end (local end), or can be set at a client end (for example, a mobile device such as a mobile phone). For example, the processor 201 can be a device with data processing capabilities and / or instruction execution capabilities, such as a central processing unit (CPU), a tensor processing unit (TPU), or a graphics processing unit GPU, and can control other components in the data prediction device 20 to perform the desired functions. The central processing unit (CPU) can be an X86 or ARM architecture, etc.

[0096] In one embodiment, the memory 200 may include any combination of one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, erasable programmable read-only memory (EPROM), portable compact disk read-only memory (CD-ROM), USB memory, flash memory, etc. One or more computer-executable instructions may be stored on the computer-readable storage medium, and the processor 201 may execute the computer-executable instructions to implement various functions of the data prediction device 20. Various applications and various data, as well as various data used and / or generated by the applications, may also be stored in the memory 200.

[0097] It should be noted that the data control device 20 can achieve technical effects similar to those of the aforementioned PV arc detection and processing method, and the repeated parts will not be repeated.

[0098] At least one embodiment of the present disclosure also provides a non-transitory computer-readable storage medium. Figure 9 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. Figure 9 As shown, one or more computer-executable instructions 301 may be non-transitory stored on a non-transitory computer-readable storage medium 30. For example, when the computer-executable instructions 301 are executed by a computer, the computer may perform one or more steps in the PV arc detection processing method according to any embodiment of the present disclosure.

[0099] In one embodiment, the non-transitory computer-readable storage medium 30 may be applied to the above-mentioned data control device 20 , for example, it may be the memory 200 in the data control device 20 .

[0100] In one embodiment, the description of the non-transitory computer-readable storage medium 30 may refer to the description of the memory 200 in the embodiment of the data control device 20 , and the repeated parts will be omitted.

[0101] It should be noted that the memory 200 stores different non-transient computer-executable instructions, and the data control device 20 corresponds to a firmware upgrade device. When the computer-executable instructions are executed by the processor 201, the processor 201 can execute one or more steps in the PV arc detection processing method according to any embodiment of the present disclosure.

[0102] Regarding this disclosure, the following points need to be explained:

[0103] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to the general design.

[0104] (2) For the sake of clarity, the thickness and size of layers or structures in the drawings used to describe the embodiments of the present invention are exaggerated. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element can be "directly on" or "under" the other element, or intervening elements may be present.

[0105] (3) Unless there is a conflict, the embodiments of the present disclosure and the features therein may be combined to form new embodiments. The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. The scope of protection of the present disclosure shall be based on the scope of protection of the claims.

[0106] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A PV arc detection and processing method, characterized in that: Including steps: Detect whether the photovoltaic inverter is in arc shielding state and detect whether an arc occurs; If an arc is detected when the photovoltaic inverter is not in an arc shielding state, detecting whether it is in a boost state; If it is in the boost state, execute the PV arc extinguishing action; After the PV arc extinguishing action is completed, if the PV output is restored, it is determined that no PV fault arc occurs; otherwise, it is determined that a PV fault arc occurs; The process of detecting whether the photovoltaic inverter is in an arc shielding state comprises the steps of: Detecting the operating status, PV current, inverter power and / or PV power of the photovoltaic inverter When the working state is a set state, the PV current change is greater than the set current, or the set power has a sudden change, it is determined that the photovoltaic inverter is in an arc shielding state; otherwise, the photovoltaic inverter is not in an arc shielding state; the set state includes a soft start state, a fast tracking state, or a power limit state; the set power includes inverter power and / or PV power; When the working state is a soft start state or a fast tracking state, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the PV current change is greater than a set current; When the PV current change is greater than a set current, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the working state is a power limiting state; When the working state is the power-limited state, determining that the photovoltaic inverter is in the arc shielding state; otherwise, determining whether the set power changes suddenly; wherein the set power includes inverter power and / or PV power; When the set power suddenly changes, it is determined that the photovoltaic inverter is in the arc shielding state; otherwise, it is determined that the photovoltaic inverter is not in the arc shielding state.

2. The PV arc detection and processing method according to claim 1, characterized in that: Also includes the steps: If it is not in the boost state, it is determined that a PV fault arc has occurred.

3. The PV arc detection and processing method according to claim 1, wherein: Also includes the steps: If the photovoltaic inverter is in an arc shielding state, the arc detection result is ignored.

4. The PV arc detection and processing method according to claim 1, wherein: The process of detecting an arc when the photovoltaic inverter is not in an arc shielding state and detecting whether it is in a boost state comprises the steps of: If the photovoltaic inverter is not in the arc shielding state for a duration not exceeding the delay time, an arc is detected, and whether the photovoltaic inverter is in the boosting state is detected.

5. A PV arc detection and processing device, characterized in that: include: A signal detection module is used to detect whether the photovoltaic inverter is in an arc shielding state and whether an arc occurs; a boost detection module, configured to detect an arc when the photovoltaic inverter is not in an arc shielding state, and detect whether it is in a boost state; Arc extinguishing execution module, used to execute PV arc extinguishing action in the boost state; a fault judgment module, configured to, after the PV arc extinguishing action is completed, determine that no PV fault arc occurs if the PV output is restored, and otherwise determine that a PV fault arc occurs; The process of detecting whether the photovoltaic inverter is in an arc shielding state comprises the steps of: Detecting the operating status, PV current, inverter power and / or PV power of the photovoltaic inverter When the working state is a set state, the PV current change is greater than the set current, or the set power has a sudden change, it is determined that the photovoltaic inverter is in an arc shielding state; otherwise, the photovoltaic inverter is not in an arc shielding state; the set state includes a soft start state, a fast tracking state, or a power limit state; the set power includes inverter power and / or PV power; When the working state is a soft start state or a fast tracking state, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the PV current change is greater than a set current; When the PV current change is greater than a set current, determining that the photovoltaic inverter is in an arc shielding state; otherwise, determining whether the working state is a power limiting state; When the working state is the power-limited state, determining that the photovoltaic inverter is in the arc shielding state; otherwise, determining whether the set power changes suddenly; wherein the set power includes inverter power and / or PV power; When the set power suddenly changes, it is determined that the photovoltaic inverter is in the arc shielding state; otherwise, it is determined that the photovoltaic inverter is not in the arc shielding state.

6. A non-transitory computer-readable storage medium, characterized in that The non-transitory computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the PV arc detection and processing method according to any one of claims 1 to 4 is implemented.

7. A data control device, characterized in that: include: one or more memories non-transitorily storing computer-executable instructions; One or more processors are configured to run computer-executable instructions, wherein the computer-executable instructions implement the PV arc detection processing method according to any one of claims 1 to 4 when the one or more processors run the instructions.

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