Arc positioning circuit and inverter

Abstract

The invention discloses an electric arc positioning circuit and an inverter, the electric arc positioning circuit comprises a maximum power point tracking module, a current sensor, an electric arc detection module and a control module, the current sensor is used for detecting real-time current values between a plurality of photovoltaic arrays and a plurality of maximum power point tracking units; the electric arc detection module determines the electric arc fault information by analyzing the real-time current value, the control module obtains the positioning information of the electric arc fault according to the electric arc positioning instruction and the electric arc fault information, the positioning of the electric arc fault can be realized only by using one current sensor, the number of used current sensors is reduced, and the product cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of new energy technologies, and particularly to an arc positioning circuit and an inverter. Background Art

[0002] With the development of photovoltaic power generation technology, the number of series-connected strings of photovoltaic modules is increasing, and accordingly, the number of various connection points on the photovoltaic link is also increasing, and the risk of direct current arc faults is also increasing.

[0003] However, in order to achieve the positioning of arc faults, a current sensor needs to be provided for each maximum power point tracking unit, which results in a relatively large number of current sensors being used and increases the manufacturing cost of the product. Summary of the Invention

[0004] The present application provides an arc positioning circuit and an inverter to alleviate the technical problem of the relatively large number of current sensors required for positioning arc faults.

[0005] In a first aspect, the present application provides an arc positioning circuit, which includes a maximum power point tracking module, a current sensor, an arc detection module, and a control module. The photovoltaic module includes a plurality of photovoltaic arrays; the maximum power point tracking module includes a plurality of maximum power point tracking units, and the input end of a maximum power point tracking unit is used to connect to the output end of a photovoltaic array in the photovoltaic module; the current sensor is used to detect the real-time current value between the plurality of photovoltaic arrays and the plurality of maximum power point tracking units; the arc detection module is connected to the current sensor, and the arc detection module is used to determine arc fault information by analyzing the real-time current value; the control module is connected to the plurality of maximum power point tracking units and the arc detection module, and the control module is used to obtain the positioning information of the arc fault according to the arc positioning instruction and the arc fault information.

[0006] In a second aspect, the present application provides an inverter, which includes the above-mentioned arc positioning circuit.

[0007] The arc positioning circuit and the inverter provided by the present application detect the real-time current value between the plurality of photovoltaic arrays and the plurality of maximum power point tracking units through a current sensor. The arc detection module determines arc fault information by analyzing the real-time current value, and the control module obtains the positioning information of the arc fault according to the arc positioning instruction and the arc fault information. Only one current sensor is needed to achieve the positioning of arc faults, which reduces the number of current sensors used and thus reduces the product cost. Description of the Drawings

[0008] The following, in conjunction with the drawings, through a detailed description of the specific embodiments of the present application, will make the technical solutions and other beneficial effects of the present application obvious.

[0009] Figure 1 It is a schematic block diagram of the arc positioning circuit provided by the embodiment of the present application.

[0010] Figure 2 It is a schematic circuit diagram of the maximum power point tracking module provided by the embodiment of the present application.

[0011] Figure 3 It is the first working flow chart of the arc positioning circuit provided by the embodiment of the present application.

[0012] Figure 4 It is the second working flow chart of the arc positioning circuit provided by the embodiment of the present application.

[0013] Figure 5 It is a schematic block diagram of the inverter provided by the embodiment of the present application. Detailed implementation manners

[0014] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0015] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0016] Please refer to Figures 1 to 5 , with the development of photovoltaic power generation technology, the number of series-connected strings of photovoltaic modules in the photovoltaic link is increasing. For example Figure 1 as shown in the photovoltaic module PV, the photovoltaic module PV includes M photovoltaic groups, and each photovoltaic group includes N photovoltaic arrays. The M photovoltaic groups exemplarily include at least one of the first photovoltaic group PV1, the second photovoltaic group PV2... the Mth photovoltaic group PVM. The first photovoltaic group PV1 exemplarily includes at least one of the group 1 path 1 photovoltaic array PV11... the group 1 path N photovoltaic array PV1N. The second photovoltaic group PV2 exemplarily includes at least one of the group 2 path 1 photovoltaic array PV21... the group 2 path N photovoltaic array PV2N. The Mth photovoltaic group PV2 exemplarily includes at least one of the group M path 1 photovoltaic array PVM1... the group M path N photovoltaic array PVMN. Among them, both M and N are natural numbers greater than or equal to 1. The number of photovoltaic arrays in each photovoltaic group can be the same or different, and each photovoltaic array includes at least one photovoltaic module or photovoltaic panel.

[0017] This embodiment provides an arc positioning circuit 100, as Figure 1 shown. The arc positioning circuit 100 includes a maximum power point tracking module 10, and the maximum power point tracking module 10 exemplarily includes at least one of a first maximum power point tracking group MPPT1, a second maximum power point tracking group MPPT2... and an Mth maximum power point tracking group MPPTM. Among them, the first maximum power point tracking group MPPT1 includes at least one of a group 1 path 1 maximum power point tracking unit MPPT11... and a group 1 path N maximum power point tracking unit MPPT1N. The second maximum power point tracking group MPPT2 includes at least one of a group 2 path 1 maximum power point tracking unit MPPT21... and a group 2 path N maximum power point tracking unit MPPT2N. The Mth maximum power point tracking group MPPTM includes at least one of a group M path 1 maximum power point tracking unit MPPT11... and a group M path N maximum power point tracking unit MPPTMN.

[0018] The input end of a maximum power point tracking unit is used to connect to the output end of a photovoltaic array in the photovoltaic module PV. For example, the input end of the group 1 path 1 maximum power point tracking unit MPPT11 is used to connect to the output end of the group 1 path 1 photovoltaic array PV11; the input end of the group 1 path N maximum power point tracking unit MPPT1N is used to connect to the output end of the group 1 path N photovoltaic array PV1N; the input end of the group 2 path 1 maximum power point tracking unit MPPT21 is used to connect to the output end of the group 2 path 1 photovoltaic array PV21; the input end of the group 2 path N maximum power point tracking unit MPPT2N is used to connect to the output end of the group 2 path N photovoltaic array PV2N; the input end of the group M path 1 maximum power point tracking unit MPPTM1 is used to connect to the output end of the group M path 1 photovoltaic array PVM1; the input end of the group M path N maximum power point tracking unit MPPTMN is used to connect to the output end of the group M path N photovoltaic array PVMN. Others can be deduced by analogy.

[0019] The arc positioning circuit 100 further includes a current sensor CT, an arc detection module 20, and a control module 30. The current sensor CT is used to detect the real-time current value between multiple photovoltaic arrays and multiple maximum power point tracking units; the arc detection module 20 is connected to the current sensor CT, and the arc detection module 20 is used to determine arc fault information by analyzing the real-time current value; the control module 30 is connected to multiple maximum power point tracking units and the arc detection module 20, and the control module 30 is used to obtain the positioning information of the arc fault according to the arc positioning instruction and the arc fault information.

[0020] It can be understood that for the arc positioning circuit 100 provided in this embodiment, a current sensor CT is used to detect the real-time current values between multiple photovoltaic arrays and multiple maximum power point tracking units. The arc detection module 20 determines the arc fault information by analyzing the real-time current values, and the control module 30 obtains the positioning information of the arc fault according to the arc positioning instruction and the arc fault information. Only one current sensor CT is needed to achieve the positioning of the arc fault, which reduces the number of current sensors CT used, thereby reducing the product cost.

[0021] In some embodiments, as Figure 1 shown, the arc positioning circuit 100 further includes a first transmission line and a second transmission line. The first transmission line is connected between the first output terminal of a photovoltaic array and the first input terminal of the maximum power point tracking unit; the second transmission line is connected between the second output terminal of a photovoltaic array and the second input terminal of the maximum power point tracking unit; wherein, the real-time current value is the current flowing through the first transmission line or the second transmission line.

[0022] It should be noted that the first output terminal of the photovoltaic array can be Figure 1 the “+” in Figure 1 , and the second output terminal of the photovoltaic array can be Figure 2 the “-” in Figure 2 . The first input terminal of the maximum power point tracking unit can be the “PV+” in

[0023] Figure 2 shown, each maximum power point tracking unit includes a first inductor L1, a first switching transistor Q1, a diode D1, and a first capacitor C1. The first end of the first inductor L1 is connected to the first output terminal of the photovoltaic array through a first transmission line; the first pole of the first switching transistor Q1 is connected to the second end of the first inductor L1, the second pole of the first switching transistor Q1 is connected to the second output terminal of the photovoltaic array through a second transmission line, and the control pole of the first switching transistor Q1 is connected to the control module 30; the anode of the diode D1 is connected to the first pole of the first switching transistor Q1 and the second end of the first inductor L1; the first end of the first capacitor C1 is connected to the cathode of the diode D1, and the second end of the first capacitor C1 is connected to the second pole of the first switching transistor Q1.

[0024] It should be noted that the maximum power point tracking unit in this embodiment is used to control the current and power of the photovoltaic array to operate at the maximum power point. The first inductor L1, the first switching transistor Q1, the diode D1, and the first capacitor C1 constitute a boost circuit, and the current flowing through the first inductor L1 can be the target current value described below.

[0025] In some of these embodiments, when the control module 30 receives an arc positioning instruction, the control module 30 controls all the first switching transistors Q1 in the maximum power point tracking module 10 to be in the cut-off state; the control module 30 sequentially controls the real-time current values of each maximum power point tracking unit to be the target current value in a time-sharing manner, and the arc detection module 20 determines the arc fault information of each maximum power point tracking unit by analyzing the real-time current value; if the arc fault information indicates that there is an arc fault in the maximum power point tracking unit, the control module 30 records and compiles the unit identification numbers of each maximum power point tracking unit, and each unit identification number serves as the positioning information of the arc fault.

[0026] It should be noted that in this embodiment, by checking one by one whether there is an arc fault in each maximum power point tracking unit, compared with first checking each maximum power point tracking group one by one and then checking each maximum power point tracking unit in the maximum power point tracking group with an arc fault one by one, the step of checking each maximum power point tracking group one by one can be omitted. When the number of maximum power point tracking units in the maximum power point tracking module 10 is small, the positioning efficiency of the arc fault can be improved.

[0027] Among them, the control module 30 has a human-machine interaction interface, and the human-machine interaction interface presents the unit identification numbers of the maximum power point tracking units with arc faults after compilation. It is possible to directly determine which maximum power point tracking unit the arc fault occurs in according to the unit identification number, thereby realizing the positioning of the arc fault.

[0028] Among them, the human-machine interaction interface includes a plurality of function buttons, and one of the function buttons can be used to start the arc positioning function and display the positioning information. When it is necessary to position the arc, only need to start the button.

[0029] In some of these embodiments, the control module 30 is used to sequentially determine whether there is an arc fault in each maximum power point tracking group according to the arc positioning instruction in a time-sharing manner. If there is an arc fault in the maximum power point tracking group, then sequentially determine whether there is an arc fault in each maximum power point tracking unit in the maximum power point tracking group in a time-sharing manner, so as to determine the unit identification number of the maximum power point tracking unit with an arc fault according to the arc fault information as the positioning information of the arc fault.

[0030] It should be noted that in this embodiment, by first checking each maximum power point tracking group one by one and then checking each maximum power point tracking unit in the maximum power point tracking group with an arc fault one by one, when the number of maximum power point tracking units in the maximum power point tracking module 10 is large, by grouping and branching to check and determine the positioning of the arc fault, the positioning efficiency of the arc fault can be improved.

[0031] In some of these embodiments, please refer to Figure 3and Figure 4 When the control module 30 receives an arc positioning instruction, the control module 30 controls all the first switching transistors Q1 in the maximum power point tracking module 10 to be in the cut-off state; the control module 30 sequentially controls each maximum power point tracking group time-divisionally, so that the real-time current value of each maximum power point tracking unit is the target current value, and the arc detection module 20 determines the arc fault information of each maximum power point tracking group by analyzing the real-time current value; if the arc fault information indicates that there is an arc fault in the maximum power point tracking group, the control module 30 sequentially controls the real-time current value of each maximum power point tracking unit in the maximum power point tracking group with the arc fault to be the target current value, and the arc detection module 20 determines the arc fault information of each maximum power point tracking unit by analyzing the real-time current value; if the arc fault information indicates that there is an arc fault in the maximum power point tracking unit, the control module 30 records and compiles the unit identification numbers of each maximum power point tracking unit, and each unit identification number is used as the positioning information of the arc fault.

[0032] It should be noted that in this embodiment, by checking each maximum power point tracking group one by one first, and then checking each maximum power point tracking unit in the maximum power point tracking group with the arc fault one by one, when the number of maximum power point tracking units in the maximum power point tracking module 10 is relatively large, the positioning of the arc fault can be determined by checking in groups and in branches, which can improve the positioning efficiency of the arc fault.

[0033] In some of these embodiments, if the arc fault information indicates that there is no arc fault in the maximum power point tracking group, the control module 30 sequentially controls the real-time current value of each maximum power point tracking unit in the next maximum power point tracking group to be the target current value, so as to determine the positioning information of the arc fault of the next maximum power point tracking group.

[0034] It should be noted that in this embodiment, by checking whether there is an arc fault in each maximum power point tracking group one by one, if there is no arc fault in the current maximum power point tracking group, then checking whether there is an arc fault in the next maximum power point tracking group, and checking with the maximum power point tracking group as a unit, when there is no arc fault in all the maximum power point tracking groups, the checking time can be saved, thereby improving the positioning efficiency of the arc fault.

[0035] In some of these embodiments, if the arc fault information indicates that there is no arc fault in the maximum power point tracking unit, the control module 30 controls the real-time current value of the next maximum power point tracking unit to be the target current value, so as to determine the positioning information of the arc fault of the next maximum power point tracking unit.

[0036] It should be noted that in this embodiment, by checking each maximum power point tracking unit one by one to see if there is an arc fault, if the current maximum power point tracking unit does not have an arc fault, then check whether the next maximum power point tracking unit has an arc fault. The checking is carried out in units of the maximum power point tracking group and combined with checking in units of the maximum power point tracking unit. In the case where the distribution of arc faults is relatively complex, the checking time can be saved, thereby improving the positioning efficiency of arc faults.

[0037] Figure 3 This is the first working flowchart of the arc positioning circuit 100 provided by the embodiment of the present application. The specific content is as follows:

[0038] Start, and complete the power-on preparation work of the arc positioning circuit 100.

[0039] Whether an arc positioning instruction is received.

[0040] The first step: If an arc positioning instruction (Y) is detected, then turn off all MPPTs. Here, MPPT refers to the maximum power point tracking unit, and the corresponding MPPT can be turned off by controlling the first switching tube Q1 to be in the off state.

[0041] The second step: Control the input current of each MPPT in group 1 to the target current value (Iref), detect whether there is arcing (arc fault), and turn off all MPPTs after this detection. The input current is the real-time current value, as shown by I1 in Figure 2 as shown.

[0042] The third step: If it is detected that there is arcing (Y) in group 1, then control the input current of MPPT 1 in group 1 to the target current value (Iref), detect whether there is arcing (arc fault). If it is detected that there is arcing in MPPT 1 in group 1, mark or record the ID of this MPPT, such as MPPT11, and turn off all MPPTs after this detection.

[0043] Control the input current of MPPT 2 in group 1 to the target current value (Iref), detect whether there is arcing (arc fault). If it is detected that there is arcing in MPPT 2 in group 1, mark or record the ID of this MPPT, such as MPPT12, and turn off all MPPTs after this detection.

[0044] And so on, control the input current of the Nth MPPT in group 1 to the target current value (Iref), detect whether there is arcing (arc fault). If it is detected that there is arcing in the Nth MPPT in group 1, mark or record the ID of this MPPT, such as MPPT1N, and turn off all MPPTs after this detection.

[0045] Fourth step: Similar to the second and third steps, using the same method, perform arc detection and marking on the remaining groups of MPPTs one by one. The specific content is as follows:

[0046] Control the input current of each MPPT in control group 2 to the target current value (Iref), detect whether there is an arc (arc fault), and turn off all MPPTs after this detection is completed.

[0047] If an arc is detected in group 2 (Y), then control the input current of MPPT 1 in group 2 to the target current value (Iref), detect whether there is an arc (arc fault). If an arc is detected in MPPT 1 of group 2, mark or record the ID of this MPPT, such as MPPT21, and turn off all MPPTs after this detection is completed.

[0048] Control the input current of MPPT 2 in group 2 to the target current value (Iref), detect whether there is an arc (arc fault). If an arc is detected in MPPT 2 of group 2, mark or record the ID of this MPPT, such as MPPT22, and turn off all MPPTs after this detection is completed.

[0049] And so on, control the input current of MPPT N in group 2 to the target current value (Iref), detect whether there is an arc (arc fault). If an arc is detected in MPPT N of group 2, mark or record the ID of this MPPT, such as MPPT2N, and turn off all MPPTs after this detection is completed.

[0050] If an arc is detected in group M (Y), then control the input current of MPPT 1 in group M to the target current value (Iref), detect whether there is an arc (arc fault). If an arc is detected in MPPT 1 of group M, mark or record the ID of this MPPT, such as MPPTM1, and turn off all MPPTs after this detection is completed.

[0051] Control the input current of MPPT 2 in group M to the target current value (Iref), detect whether there is an arc (arc fault). If an arc is detected in MPPT 2 of group M, mark or record the ID of this MPPT, such as MPPTM2, and turn off all MPPTs after this detection is completed.

[0052] And so on, control the input current of MPPT N in group M to the target current value (Iref), detect whether there is an arc (arc fault). If an arc is detected in MPPT N of group M, mark or record the ID of this MPPT, such as MPPTMN, and turn off all MPPTs after this detection is completed.

[0053] Fifth step: Summarize the positioning information detected by the overall arc striking, and send it to the human-machine interaction interface.

[0054] Based on the above steps, when the number of MPPTs is small, the second step can be skipped and the third step can be directly executed to successively start the arc striking positioning for each path of MPPT.

[0055] Figure 4 This is the second working flowchart of the arc striking positioning circuit 100 provided by the embodiment of the present application. The specific content is as follows:

[0056] Start and complete the power-on preparation work of the arc striking positioning circuit 100.

[0057] Whether an arc striking positioning instruction is received.

[0058] Sixth step: If an arc striking positioning instruction (Y) is detected, then turn off all MPPTs. Here, the MPPT refers to the maximum power point tracking unit, and the corresponding MPPT can be turned off by controlling the first switching transistor Q1 to be in the off state.

[0059] Second step: Short-circuit each path of MPPT in control group 1, detect whether there is an arc strike (arc fault), and turn off all MPPTs after this detection.

[0060] Third step: If an arc strike is detected in control group 1 (Y), then short-circuit the MPPT of path 1 in control group 1, detect whether there is an arc strike (arc fault). If an arc strike is detected in the MPPT of path 1 in control group 1, mark or record the ID of this path of MPPT, such as MPPT11, and turn off all MPPTs after this detection.

[0061] Short-circuit the MPPT of path 2 in control group 1. If an arc strike is detected in the MPPT of path 2 in control group 1, mark or record the ID of this path of MPPT, such as MPPT12, and turn off all MPPTs after this detection.

[0062] And so on, short-circuit the MPPT of path N in control group 1. If an arc strike is detected in the MPPT of path N in control group 1, mark or record the ID of this path of MPPT, such as MPPT1N, and turn off all MPPTs after this detection.

[0063] Fourth step: Similar to the second step and the third step, use the same method to successively perform arc strike detection and marking on each path of MPPT in the remaining groups. The specific content is as follows:

[0064] Short-circuit each path of MPPT in control group 2, detect whether there is an arc strike (arc fault), and turn off all MPPTs after this detection.

[0065] If arcing (Y) is detected in Group 2, control the short - circuit of 1MPPT in Group 2. If arcing is detected in 1MPPT of Group 2, mark or record the ID of this MPPT, such as MPPT21. After completing this detection, turn off all MPPTs.

[0066] Control the short - circuit of 2MPPT in Group 2. If arcing is detected in 2MPPT of Group 2, mark or record the ID of this MPPT, such as MPPT22. After completing this detection, turn off all MPPTs.

[0067] And so on, control the short - circuit of NMPPT in Group 2. If arcing is detected in NMPPT of Group 2, mark or record the ID of this MPPT, such as MPPT2N. After completing this detection, turn off all MPPTs.

[0068] If arcing (Y) is detected in Group M, control the short - circuit of 1MPPT in Group M, and detect whether there is arcing (arc fault). If arcing is detected in 1MPPT of Group M, mark or record the ID of this MPPT, such as MPPTM1. After completing this detection, turn off all MPPTs.

[0069] Control the short - circuit of 2MPPT in Group M. If arcing is detected in 2MPPT of Group M, mark or record the ID of this MPPT, such as MPPTM2. After completing this detection, turn off all MPPTs.

[0070] And so on, control the short - circuit of NMPPT in Group M. If arcing is detected in NMPPT of Group M, mark or record the ID of this MPPT, such as MPPTMN. After completing this detection, turn off all MPPTs.

[0071] The fifth step: Summarize the positioning information detected by the overall arcing detection and send it to the human - machine interaction interface.

[0072] Based on the above steps, when the number of MPPTs is small, the second step can also be skipped and the third step can be directly executed to sequentially start the arcing positioning for each MPPT.

[0073] It should be noted that the input current of each MPPT to the target current value (Iref) can be achieved by controlling the intermittent conduction of the first switching transistor Q1 through the control module 30. The short - circuit of each MPPT can be achieved by controlling the continuous conduction of the first switching transistor Q1 through the control module 30. The target current value in the case of the continuous conduction of the first switching transistor Q1 is greater than the target current in the case of the intermittent conduction of the first switching transistor Q1.

[0074] In some of these embodiments, the present embodiment further provides an inverter 200, as Figure 5As shown, the inverter 200 includes the above-mentioned arc positioning circuit 100.

[0075] It can be understood that since the inverter 200 provided in this embodiment includes the above-mentioned arc positioning circuit 100, it can also detect the real-time current values between multiple photovoltaic arrays and multiple maximum power point tracking units through a current sensor CT. The arc detection module 20 determines the arc fault information by analyzing the real-time current values, and the control module 30 obtains the positioning information of the arc fault based on the arc positioning instruction and the arc fault information. Only one current sensor CT is needed to achieve the positioning of the arc fault, which reduces the number of current sensors CT used, thereby reducing the product cost.

[0076] In some of these embodiments, as Figure 5 shown, the inverter 200 further includes a bus capacitor C2 and an inverter module 40. The bus capacitor C2 is connected in parallel between the two output terminals (BUS+, BUS-) of each MPPT, connecting the MPPT and the inverter module 40, and is used for energy storage and filtering; the inverter module 40 is used to convert the energy on the bus capacitor C2 into AC electric energy under the control of the control module 30.

[0077] Among them, the human-machine interface is used to start arc positioning and display the positioning information.

[0078] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The above has introduced the arc positioning circuit 100 and the inverter 200 provided by the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An arc positioning circuit, characterized in that, The arc positioning circuit includes: A maximum power point tracking module, which includes a plurality of maximum power point tracking units. The input end of the maximum power point tracking unit is used to connect to the output end of the photovoltaic array in the photovoltaic module; A current sensor, which is used to detect the real-time current value between the plurality of photovoltaic arrays and the plurality of maximum power point tracking units; An arc detection module, which is connected to the current sensor. The arc detection module is used to determine arc fault information by analyzing the real-time current value; A control module, which is connected to the plurality of maximum power point tracking units and the arc detection module. The control module is used to obtain the positioning information of the arc fault according to the arc positioning instruction and the arc fault information.

2. The arc positioning circuit according to claim 1, wherein The arc positioning circuit further includes: A first transmission line, which is connected between the first output end of the photovoltaic array and the first input end of the maximum power point tracking unit; A second transmission line, which is connected between the second output end of the photovoltaic array and the second input end of the maximum power point tracking unit; Wherein, the real-time current value is the current flowing through the first transmission line or the second transmission line.

3. The arc positioning circuit according to claim 2, wherein Each of the maximum power point tracking units includes: A first inductor, the first end of which is connected to the first output end of the photovoltaic array through the first transmission line; A first switching tube, the first pole of which is connected to the second end of the first inductor. The second pole of the first switching tube is connected to the second output end of the photovoltaic array through the second transmission line, and the control pole of the first switching tube is connected to the control module; A diode, the anode of which is connected to the first pole of the first switching tube and the second end of the first inductor; A first capacitor, the first end of which is connected to the cathode of the diode, and the second end of which is connected to the second pole of the first switching tube.

4. The arc positioning circuit according to claim 3, wherein When the control module receives the arc positioning instruction, the control module controls all the first switching tubes in the maximum power point tracking module to be in the cut-off state; The control module sequentially controls the real-time current value of each maximum power point tracking unit to be a target current value in a time-sharing manner. The arc detection module determines the arc fault information of each maximum power point tracking unit by analyzing the real-time current value; If the arc fault information indicates that there is an arc fault in the maximum power point tracking unit, the control module records and compiles the unit identification numbers of each maximum power point tracking unit, and each unit identification number serves as the positioning information of the arc fault.

5. The arc positioning circuit according to claim 3, wherein The photovoltaic module includes a plurality of photovoltaic groups, and each photovoltaic group includes a plurality of the photovoltaic arrays; The maximum power point tracking module includes a plurality of maximum power point tracking groups, and each maximum power point tracking group includes a plurality of the maximum power point tracking units; The control module is used to sequentially and time-divisionally determine whether there is an arc fault in each of the maximum power point tracking groups according to the arc positioning instruction. If there is an arc fault in the maximum power point tracking group, it then sequentially and time-divisionally determines whether there is an arc fault in each of the maximum power point tracking units in the maximum power point tracking group, so as to determine the unit identification number of the maximum power point tracking unit with an arc fault according to the arc fault information as the positioning information of the arc fault.

6. The arc positioning circuit according to claim 5, characterized in that, When the control module receives the arc positioning instruction, the control module controls all the first switching tubes in the maximum power point tracking module to be in the cut-off state; The control module sequentially and time-divisionally controls each of the maximum power point tracking groups, so that the real-time current value of each maximum power point tracking unit is the target current value, and the arc detection module determines the arc fault information of each maximum power point tracking group by analyzing the real-time current value; If the arc fault information indicates that there is an arc fault in the maximum power point tracking group, the control module sequentially and time-divisionally controls the real-time current value of each maximum power point tracking unit in the maximum power point tracking group with the arc fault to be the target current value, and the arc detection module determines the arc fault information of each maximum power point tracking unit by analyzing the real-time current value; If the arc fault information indicates that there is an arc fault in the maximum power point tracking unit, the control module records and compiles the unit identification numbers of each maximum power point tracking unit, and each of the unit identification numbers is used as the positioning information of the arc fault.

7. The arc positioning circuit according to claim 6, characterized in that, If the arc fault information indicates that there is no arc fault in the maximum power point tracking group, the control module sequentially and time-divisionally controls the real-time current value of each maximum power point tracking unit in the next maximum power point tracking group to be the target current value, so as to determine the positioning information of the arc fault of the next maximum power point tracking group.

8. The arc positioning circuit according to any one of claims 4-7, characterized in that, If the arc fault information indicates that there is no arc fault in the maximum power point tracking unit, the control module controls the real-time current value of the next maximum power point tracking unit to be the target current value, so as to determine the positioning information of the arc fault of the next maximum power point tracking unit.

9. The arc positioning circuit according to any one of claims 4-7, characterized in that, The control module controls the first switching tube to conduct intermittently or continuously to obtain the target current value.

10. An inverter, characterized in that, The inverter includes the arc positioning circuit according to any one of claims 1-9.

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