Arc discharge network circuit, arc discharge jig, control method of arc discharge jig and related equipment

Abstract

The invention relates to an arc discharge network circuit, an arc discharge jig, a control method of the arc discharge jig and related equipment of the arc discharge jig, and relates to the technical field of direct current arc discharge testing. The arc discharge network circuit comprises a photovoltaic analog power supply, a decoupling network circuit and a linear impedance network circuit, wherein in the linear impedance network circuit, a plurality of line simulation capacitors, a plurality of bypass simulation capacitors and a plurality of line simulation inductors are connected with a switch after being connected in parallel, and are respectively provided with different capacitance values and inductance values; wherein the devices connected to different capacitance values and inductance values based on switching of the switch can obtain arcing network circuits in different string modes, and the string states comprise a half-string string mode, a whole-string string mode, a parallel-string string mode and a module-level string mode. The arc discharge network circuit can adapt to the test requirements of different models, and the technical effects of reducing the test cost, improving the test efficiency, reducing the complexity of the test operation and expanding the application scene of the arc discharge network circuit are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of direct current arc testing, and in particular to an arc network circuit, an arc jig, a control method for the arc jig, and related equipment. Background Art

[0002] In the context of the rapid development of the distributed photovoltaic industry, ensuring the safety of photovoltaic systems has become an important issue. DC arcing may not only cause safety accidents such as fires, but also reduce the efficiency and life of the system. Therefore, the development of effective DC arcing detection technology is crucial to improving the overall safety and reliability of photovoltaic systems.

[0003] Arc detection first needs to be studied in the laboratory, using a photovoltaic simulation power supply, a decoupling network and a linear impedance network set between the photovoltaic simulation power supply and the inverter to form an arc network circuit and then perform arc detection. On the one hand, the photovoltaic simulation power supply used helps to overcome the limitations of the test site and funds in the laboratory; on the other hand, the decoupling network can shield the power supply noise, and the linear impedance network can simulate the PV line length of the real photovoltaic site, so that the arc network circuit containing the photovoltaic simulation source can be equivalent to the real photovoltaic site (that is, the real photovoltaic panel + PV line length), thereby achieving a more accurate arc detection effect.

[0004] Since different connection methods of photovoltaic strings determine the electrical characteristics of the photovoltaic system, thus affecting the effect of arc detection. The arc network circuit in the related art needs to make an arc network circuit corresponding to the string mode according to different simulated working conditions. Therefore, the single arc network circuit provided in the related art is difficult to adapt to the test requirements of different models, and the use of multiple separately made arc network circuits increases the test cost and test time, increases the complexity of the test operation, and the applicable scenarios of the arc network circuit are relatively narrow.

[0005] With respect to the above-mentioned problems in the related technologies, no effective solutions have been proposed yet. Summary of the invention

[0006] An arc-drawing network circuit, an arc-drawing jig, a control method for an arc-drawing jig and related equipment provided in the embodiments of the present invention at least solve the problems that the arc-drawing network circuit provided in the related art cannot adapt to the testing requirements of different machine models, and has high testing costs, low testing efficiency, complex testing operations and narrow applicable scenarios.

[0007] In order to solve the above problems, one aspect of an embodiment of the present invention provides an arc-drawing network circuit, which includes a photovoltaic simulation power supply, a decoupling network circuit, and a linear impedance network circuit; wherein:

[0008] The photovoltaic simulation power source is connected to the decoupling network circuit and the linear impedance network circuit in sequence via the positive power line and the negative power line for inputting direct current;

[0009] The decoupling network circuit includes a decoupling capacitor and a common-mode filter inductor; wherein the two ends of the decoupling capacitor are respectively connected to the positive power line and the negative power line; and the two coils of the common-mode filter inductor are respectively arranged on the positive power line and the negative power line;

[0010] The linear impedance network circuit includes multiple line simulation capacitors, multiple bypass simulation capacitors, multiple line simulation inductors and multiple switches. The multiple line simulation capacitors are arranged in parallel and connected to a switch, and are respectively set with different capacitance values; multiple bypass simulation capacitors are arranged in parallel and connected to another switch, and are respectively set with different capacitance values; multiple line simulation inductors are arranged in parallel and connected to another switch, and are respectively set with different inductance values; wherein, based on the switching of the switch, devices connected to different capacitance values ​​and inductance values ​​can obtain arc-drawing network circuits with different string modes, and the string states include half-string string mode, whole-string string mode, parallel string mode, and module-level string mode.

[0011] In some of these embodiments,

[0012] The decoupling network circuit also includes a first bypass capacitor, a second bypass capacitor, a first air-core inductor, and a second air-core inductor; wherein one end of the first bypass capacitor is connected to the positive power line, and the other end is grounded; one end of the second bypass capacitor is connected to the negative power line, and the other end is grounded; the first air-core inductor is arranged on the positive power line; and the second air-core inductor is arranged on the negative power line;

[0013] The linear impedance network circuit also includes an analog resistor, which is arranged on the power line.

[0014] In order to solve the above problems, one aspect of the embodiments of the present invention provides an arc drawing tool, comprising: a controller and a plurality of any of the above arc drawing network circuits; wherein:

[0015] The controller is connected to multiple arc-drawing network circuits, and includes a controller chip, a power module, and an information receiving module; wherein the information receiving module is used to receive a target string mode input by a user, the controller chip is used to adjust the string mode of multiple arc-drawing network circuits according to the received target string mode, and the power module is used to supply power to the controller.

[0016] In some of these embodiments,

[0017] The controller also includes a switch driving module, which is used to receive instructions from the controller chip and drive and control switches in multiple arc-drawing network circuits according to the instructions so that the switches switch to devices corresponding to the target string mode.

[0018] In some of these embodiments,

[0019] The controller also includes a temperature sensor module and a cooling module; wherein the temperature sensor module is used to monitor the tool temperature of the arc drawing tool, and the cooling module is used to cool the arc drawing tool.

[0020] In order to solve the above problems, one aspect of an embodiment of the present invention provides a control method for an arc drawing jig, which is used to control any of the above arc drawing jigs, and the method further includes:

[0021] A target string mode inputted by a user is received based on a controller in the arc drawing tool;

[0022] The switches in the plurality of arcing network circuits are driven and controlled according to the target string mode, so as to adjust the string modes corresponding to the plurality of arcing network circuits to the target string mode.

[0023] In some of these embodiments, the method further comprises:

[0024] During the arc test based on the adjusted arc jig, the jig temperature of the arc jig is monitored in real time based on the temperature sensor module in the controller. If the jig temperature is greater than the temperature threshold, a cooling instruction is generated based on the controller chip, and the cooling module is controlled to cool the arc jig in response to the cooling instruction until the real-time jig temperature is lower than the temperature threshold.

[0025] In some of these embodiments, the method further comprises:

[0026] The controller receives the target number of arc-drawing network circuits input by the user to adjust the arc-drawing network circuits connected to the arc-drawing metallurgy; wherein the target number of arc-drawing network circuits includes the total number of arc-drawing network circuits and the number of arc-drawing network circuits corresponding to each target arc-drawing string mode.

[0027] In some of these embodiments, the method further comprises:

[0028] If the total number of arc-drawing network circuits is greater than the threshold value of the number of arc-drawing network circuits corresponding to the controller, the number of arc-drawing jigs is increased, and multiple arc-drawing jigs are processed in parallel.

[0029] In order to solve the above problems, one aspect of an embodiment of the present invention provides an arc detection system for a photovoltaic inverter, comprising: a photovoltaic inverter and any one of the above arc-drawing tools; wherein the photovoltaic inverter includes an arc fault detection device.

[0030] The beneficial effects of the embodiments of the present invention are as follows: an arc-drawing network circuit including a photovoltaic simulation power supply, a decoupling network circuit, and a linear impedance network circuit is adopted; wherein the photovoltaic simulation power supply is connected to the decoupling network circuit and the linear impedance network circuit in sequence via a positive power line and a negative power line for inputting direct current; the decoupling network circuit includes a decoupling capacitor and a common-mode filter inductor; wherein the two ends of the decoupling capacitor are respectively connected to the positive power line and the negative power line; the two coils of the common-mode filter inductor are respectively arranged on the positive power line and the negative power line; the linear impedance network circuit includes a plurality of line simulation capacitors, a plurality of bypass simulation Capacitors, multiple line simulation inductors and multiple switches, multiple line simulation capacitors are arranged in parallel and connected to a switch, and are respectively set with different capacitance values; multiple bypass simulation capacitors are arranged in parallel and connected to another switch, and are respectively set with different capacitance values; multiple line simulation inductors are arranged in parallel and connected to another switch, and are respectively set with different inductance values; wherein, based on the switching of the switch, devices connected to different capacitance values ​​and inductance values ​​can obtain arcing network circuits with different string modes, and the string states include half-string string mode, whole-string string mode, parallel string mode, and module-level string mode. The present invention overcomes the problem that the arc-drawing network circuit in the related art needs to produce an arc-drawing network circuit corresponding to the string mode according to different simulated working conditions, so the single arc-drawing network circuit provided in the related art is difficult to adapt to the testing requirements of different models, and the use of multiple separately produced arc-drawing network circuits increases the testing cost and testing time, increases the complexity of the testing operation, and the applicable scenarios of the arc-drawing network circuit are relatively narrow. The present application provides a universal arc-drawing network circuit that can automatically switch the string mode according to actual testing requirements to adapt to the testing requirements of different models, thereby achieving the technical effect of reducing testing costs, improving testing efficiency, reducing the complexity of testing operations, and expanding the applicable scenarios of arc-drawing network circuits.

[0031] The details of one or more embodiments of the invention are set forth in the following drawings and description so that other features, objects, and advantages of the invention are more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a circuit topology diagram of an arc network circuit in the related technology.

[0034] Figure 2 It is a circuit topology diagram of an arc network circuit according to an embodiment of the present invention.

[0035] Figure 3 It is a schematic diagram of the framework of an arc drawing jig according to an embodiment of the present invention.

[0036] Figure 4 It is a schematic diagram of the framework of a controller in an arc drawing tool according to an embodiment of the present invention.

[0037] Figure 5 It is a flow chart of a control method of an arc drawing jig according to an embodiment of the present invention.

[0038] Figure 6 It is a schematic structural diagram of the electronic device of the present invention. DETAILED DESCRIPTION

[0039] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0040] China's national standard GB / T 39750-2021 "Technical Requirements for DC Arc Protection of Photovoltaic Power Generation Systems" states in Section 7.1.1 [General Requirements] that "the test system used for testing DC arc protection devices should include test equipment such as DC power supply, decoupling network, linear impedance network, arc generator, arc protector, etc. The line structure should be Figure 1 As shown…the DC power supply can be a constant voltage power supply or a photovoltaic array simulation power supply".

[0041] The international test standard IEC 63027 released by Fraunhofer ISE in Germany requires that when using a power supply experiment with a photovoltaic simulator in the laboratory, a decoupling network and a linear impedance network must be added between the photovoltaic simulation power supply and the inverter to shield the power supply noise through the decoupling network. The linear impedance network can simulate the PV line length of the real photovoltaic site, so that the arc network circuit containing the photovoltaic simulation source can be equivalent to the real photovoltaic site (that is, the real photovoltaic panel + PV line length), thereby achieving more reliable and realistic testing of the inverter and providing new protection for the safety of the photovoltaic system.

[0042] Since different connection methods of photovoltaic strings determine the electrical characteristics of the photovoltaic system, thus affecting the effect of arc detection. The arc network circuit in the related art needs to make an arc network circuit corresponding to the string mode according to different simulated working conditions. Therefore, the single arc network circuit provided in the related art is difficult to adapt to the test requirements of different models, and the use of multiple separately made arc network circuits increases the test cost and test time, increases the complexity of the test operation, and the applicable scenarios of the arc network circuit are relatively narrow.

[0043] In order to solve the above problems, an embodiment of the present invention provides an arc-drawing network circuit, such as Figure 2 As shown, the arc-drawing network circuit mainly includes: a photovoltaic simulation power supply, a decoupling network circuit, and a linear impedance network circuit; wherein the photovoltaic simulation power supply is connected to the decoupling network circuit and the linear impedance network circuit in sequence via the positive power line and the negative power line for inputting direct current; the decoupling network circuit includes a decoupling capacitor and a common-mode filter inductor; wherein the two ends of the decoupling capacitor are respectively connected to the positive power line and the negative power line; the two coils of the common-mode filter inductor are respectively arranged on the positive power line and the negative power line; the linear impedance network circuit includes a plurality of line simulation capacitors, a plurality of bypass simulation capacitors, a plurality of line The invention relates to a circuit simulating inductor and a plurality of switches, wherein a plurality of circuit simulating capacitors are arranged in parallel and connected to a switch and are respectively provided with different capacitance values; a plurality of bypass simulating capacitors are arranged in parallel and connected to another switch and are respectively provided with different capacitance values; a plurality of circuit simulating inductors are arranged in parallel and connected to another switch and are respectively provided with different inductance values; wherein, based on the switching of the switches, devices connected to devices with different capacitance values ​​and inductance values ​​can obtain arc-drawing network circuits with different string modes, and the string states include half-string string mode, whole-string string mode, parallel string mode and module-level string mode.

[0044] Due to the connection methods of different components in the photovoltaic system, they play a key role in the arc detection experiment. In the experiment, in order to simulate the real environment, it is necessary to select appropriate parameter settings according to different connection methods to ensure the effectiveness and accuracy of arc detection. Based on the arc network circuit provided by the embodiment of the present invention, by switching the switch to connect to the line simulation capacitor, bypass simulation capacitor, and line simulation inductor indicated by the capacitance value and inductance value corresponding to the target string mode, it is realized to simulate different string modes (such as half string, full string, parallel string, module string) in actual scenes, which makes the same set of arc network circuits applicable to arc test scenarios of various photovoltaic system architectures.

[0045] According to a specific implementation of the embodiment of the present invention, Figure 2As shown, the input of the arc-drawing network circuit is the photovoltaic simulation power supply, and the decoupling network is mainly used to shield the noise interference of the photovoltaic simulation power supply. Specifically, Figure 2 As shown, in the decoupling network: the two ends of the decoupling capacitor C1 are connected to the positive power line and the negative power line respectively, which can avoid the interference of the ripple of the DC source on the tested equipment. The capacitance value of the decoupling capacitor C1 determines the output value of the DC source; the two coils of the common mode filter inductor L1 are respectively set on the positive power line and the negative power line to suppress common mode interference. Through the synergistic effect of each capacitor and inductor in the decoupling network circuit, the photovoltaic simulation power supply and the inverter are effectively isolated, and the noise interference caused by the photovoltaic simulation power supply to the test is avoided, which helps to improve the stability and safety of the arc detection system.

[0046] The linear impedance network circuit is a circuit structure used to simulate the line length of a real photovoltaic field, specifically, Figure 2 As shown, the linear impedance network circuit provided in the embodiment of the present invention replaces the complex capacitance and impedance in the real PV line length through capacitor components, inductor components and resistor components such as line simulation capacitor C4, bypass simulation capacitors C5, C6, line simulation inductors L4, L5 and simulation resistors R3, R4, which is equivalent to an equivalent circuit of a real PV line length, thereby realizing the simulation of the real PV line length.

[0047] According to a specific implementation of an embodiment of the present invention, the simulated resistors R3 and R4 are mainly used to simulate the impedance corresponding to the real PV line length. It should be noted that in specific implementation, only the combination of the above-mentioned multiple components (capacitor components, inductor components and resistor components) can achieve the simulation of the real PV line length and realize the equivalent replacement of the real PV line length.

[0048] The switch in the embodiment of the present invention may be a relay, and the specific relay type is determined according to the number of line simulation capacitors, bypass simulation capacitors, and line simulation inductors (the number of line simulation capacitors, bypass simulation capacitors, and line simulation inductors is determined by the number of simulation capacitor values ​​and inductance values ​​corresponding to different string modes). Figure 2 As shown in the figure, the international test standard IEC 63027 specifies two capacitance values ​​for the line simulation capacitor C4 in the half string mode and the full string mode. Figure 2The first switch K1 corresponding to the multiple line simulation capacitors arranged in parallel adopts a double-pole double-throw relay; a capacitance value is specified for the bypass simulation capacitors C5 and C6 in the Half string mode and the Full string, respectively, so the corresponding second switch K2 and third switch K3 adopt a single-pole double-throw relay; an inductance value is specified for the line simulation inductors L4 and L5 in the Half string mode and the Full string, respectively, so the corresponding fourth switch K4 and fifth switch K5 adopt a single-pole double-throw relay. By controlling these relays through the controller, the capacitance and inductance values ​​can be switched freely, thereby realizing the switching of the arc network circuit between Half string and Full string. It should be noted that Figure 2 The circuit topology diagram of the arc-drawing network circuit that satisfies the switching between the Half string and Full string modes is shown. It can be understood that if it is also necessary to realize the switching between the parallel string and module string modes, it is necessary to add line simulation capacitors, bypass simulation capacitors, and line simulation inductors with corresponding capacitance and inductance values, and adjust the relay type.

[0049] In some of the embodiments, the above-mentioned decoupling network circuit also includes a first bypass capacitor, a second bypass capacitor, a first air-core inductor, and a second air-core inductor; wherein, one end of the first bypass capacitor is connected to the positive power line, and the other end is grounded; one end of the second bypass capacitor is connected to the negative power line, and the other end is grounded; the first air-core inductor is arranged on the positive power line; the second air-core inductor is arranged on the negative power line; the above-mentioned linear impedance network circuit also includes an analog resistor, and the analog resistor is arranged on the power line.

[0050] According to a specific implementation of the embodiment of the present invention, Figure 2 As shown, the decoupling network also includes: a first bypass capacitor C2, a second bypass capacitor C3, a first air-core inductor L2, and a second air-core inductor L3, wherein the bypass capacitors C2 and C3 are used to absorb high-frequency noise and shunt the high-frequency noise from the main circuit to the ground to reduce the noise conducted to the subsequent circuit. The main function of the air-core inductors L2 and L3 is filtering to reduce the impact of noise on the subsequent circuit; further, in order to avoid the saturation effect and ensure that the inductor will not be distorted under large currents, the inductance value of the air-core inductor can be set to be greater than 60μH. R1 and R2 are protective resistors, but when the DC power supply is a photovoltaic simulation power supply, the resistance values ​​corresponding to R1 and R2 are 0, so they are not set.

[0051] According to an embodiment of the present invention, the parameter requirement values ​​for each device in the arc-drawing network circuit in the international test standard IEC 63027 are provided, as shown in the following table:

[0052]

[0053] It is understandable that if the international test standard IEC 63027 is not referred to, but the Chinese national standard GB / T39750-2021 is referred to, the parameter values ​​of the corresponding devices in the above-mentioned arc-drawing network circuit need to be adjusted accordingly.

[0054] The above-mentioned arc-drawing network circuit provided in the embodiment of the present invention overcomes the problem that the arc-drawing network circuit in the related art needs to produce an arc-drawing network circuit corresponding to the string mode according to different simulated working conditions, so the single arc-drawing network circuit provided in the related art is difficult to adapt to the testing requirements of different models, and the use of multiple separately produced arc-drawing network circuits increases the testing cost and testing time, increases the complexity of the testing operation, and the applicable scenarios of the arc-drawing network circuit are relatively narrow. The present application provides a universal arc-drawing network circuit that can automatically switch the string mode according to actual testing requirements to adapt to the testing requirements of different models, thereby achieving the technical effect of reducing testing costs, improving testing efficiency, reducing the complexity of testing operations, and expanding the applicable scenarios of arc-drawing network circuits.

[0055] In order to solve the above problems, the embodiment of the present invention provides an arc drawing tool, such as Figure 3 As shown, the arc drawing tool mainly includes: a controller and a plurality of any of the above-mentioned arc drawing network circuits; wherein the controller is connected to the plurality of arc drawing network circuits, including a controller chip, a power module, and an information receiving module; wherein the information receiving module is used to receive a target string mode input by a user, the controller chip is used to adjust the string mode of the plurality of arc drawing network circuits according to the received target string mode, and the power module is used to supply power to the controller.

[0056] In order to improve the automation level of arc testing and further improve the ease of operation of arc network circuits, the present invention also provides an arc jig that manages and adjusts the string mode of multiple arc network circuits by introducing a centralized controller. Figure 3 A schematic block diagram of an arc drawing fixture is shown. It should be noted that the number of arc drawing network circuits in the arc drawing fixture can be adjusted according to factors such as the processing capability of the controller chip, the number of pins of the controller, and the size of the controller processing memory space. Figure 3 The six arc-drawing network circuits shown are not intended to limit the present application.

[0057] Based on the above controller, the arc drawing fixture provided by the embodiment of the present invention can automatically switch the corresponding string mode of the arc drawing network circuit through the controller according to the information input by the user end (information determined according to the specific test scenario). Figure 4As shown, the power module in the controller supplies power to the entire controller; the information receiving module may include a screen and a key module, which is used to input / set the string mode corresponding to each arc network circuit through the key module.

[0058] Through the above settings, the controller chip automatically adjusts the arc network circuit according to the received target string mode without manual intervention, which greatly improves the efficiency and convenience of the test; the controller can accurately adjust the arc network circuit according to specific test requirements, making the test conditions closer to the actual application environment, thereby improving the accuracy and reliability of the test data. By introducing a controller to manage the string mode adjustment of the arc network circuit, not only the automation level and accuracy of the test are improved, but also the cost is significantly reduced, the operation process is simplified, and the arc test is more efficient, safe and reliable, which helps to further expand the applicable scenarios of arc jigs.

[0059] In some of the embodiments, the controller further includes a switch driving module, which is used to receive instructions from the controller chip and drive and control switches in multiple arc-drawing network circuits according to the instructions so that the switches switch to devices corresponding to the target string mode.

[0060] The controller chip can generate corresponding control instructions according to the preset target string mode. These instructions are sent to the switch drive module, and then through the drive control of the switch drive module, it can ensure that all related switches are switched according to the predetermined mode, thereby achieving accurate control and rapid response to the circuit string mode. Through centralized control, the possibility of misoperation caused by manual operation is also reduced, and the stability and reliability of the system are improved.

[0061] In some of the embodiments, the controller further includes a temperature sensor module and a cooling module; wherein the temperature sensor module is used to monitor the tool temperature of the arc drawing tool, and the cooling module is used to cool the arc drawing tool.

[0062] like Figure 4 As shown, the controller also includes a temperature sensor module and a cooling module (i.e., a fan drive module). During specific operation, the user can set the temperature threshold through the button module. When the temperature sensor module detects that the arc-drawing jig's jig temperature is greater than the temperature threshold, the controller chip can send a signal to the fan drive module to drive the fan to cool the jig; when the jig temperature is less than the temperature threshold, the fan stops working.

[0063] By integrating the temperature sensor module and the cooling module, not only can the operating temperature of the arc jig be effectively controlled, but the safety, reliability and work efficiency of the overall system can also be improved, while also helping to optimize the quality of the test results.

[0064] The arc-drawing jig provided in the embodiment of the present invention adopts an arc-drawing jig including a controller and a plurality of any of the above-mentioned arc-drawing network circuits; wherein the controller is connected to the plurality of arc-drawing network circuits, and includes a controller chip, a power module, and an information receiving module; wherein the information receiving module is used to receive the target string mode input by the user, the controller chip is used to adjust the string mode of the plurality of arc-drawing network circuits according to the received target string mode, and the power module is used to supply power to the controller. The arc-drawing network circuit is automatically adjusted according to the received target string mode without manual intervention, which greatly improves the efficiency and convenience of the test; the arc-drawing network circuit can be accurately adjusted according to specific test requirements, so that the test conditions are closer to the actual application environment, thereby improving the accuracy and reliability of the test data. The technical effect of improving the automation level and accuracy of the test, reducing costs, simplifying the operation process, making the arc-drawing test more efficient, safe and reliable, and expanding the applicable scenarios of the arc-drawing jig is achieved.

[0065] The embodiment of the present invention also provides a control method for an arc drawing tool, optionally, as Figure 5 As shown, the control method of the arc drawing tool provided in the embodiment of the present invention mainly includes:

[0066] Step S501, receiving a target string mode input by a user based on a controller in the arc drawing tool.

[0067] Through the above settings, the user is allowed to input the target string mode in a simple way, so that the user can set the required test configuration quickly and easily, and use the target string mode input by the user as the basis for subsequent control, thereby ensuring the accuracy of the input, simplifying the operation process, improving the system's ability to cope with different test requirements, and increasing the flexibility of the system.

[0068] Step S502, driving and controlling the switches in the plurality of arcing network circuits according to the target string mode, so as to adjust the string modes corresponding to the plurality of arcing network circuits to the target string mode.

[0069] Through the above settings, the controller can accurately adjust the switch state in the arc network circuit according to the target string mode input by the user to ensure that the circuit configuration meets expectations. At the same time, automatic control is also realized to improve the efficiency of arc testing. Specifically, the actions of all switches are uniformly dispatched by the controller, ensuring that the string mode adjustment of all related circuits is consistent, avoiding errors that may be caused by manual operation, and improving the reliability and stability of the system.

[0070] In some of the embodiments, the method further includes: in the process of performing an arc test based on the adjusted arc jig, the jig temperature of the arc jig is monitored in real time based on a temperature sensor module in the controller; if the jig temperature is greater than a temperature threshold, a cooling instruction is generated based on the controller chip, and the cooling module is controlled to cool the arc jig in response to the cooling instruction until the real-time jig temperature is lower than the temperature threshold.

[0071] By real-time monitoring of the fixture temperature, overheating can be detected in time, and the fixture can be kept running within the appropriate operating temperature range, which can reduce the damage caused by high temperature to the equipment and extend its service life. If the temperature is too high, cooling measures can be taken in time to prevent safety accidents caused by high temperature and protect the safety of equipment and personnel. Through the above settings, the safety and controllability of the test process are improved, the test conditions are optimized, and the validity of the test results is guaranteed, and efficient equipment management is achieved through automation.

[0072] In some of the embodiments, the method further includes: based on the controller receiving a target number of arc-drawing network circuits input by a user, adjusting the arc-drawing network circuits connected to the arc-drawing metallurgy; wherein the target number of arc-drawing network circuits includes the total number of arc-drawing network circuits and the number of arc-drawing network circuits corresponding to each target arc-drawing string mode.

[0073] Through the above settings, users can input the number of target arcing network circuits according to actual test requirements, and the system automatically adjusts the circuit configuration based on this information, which makes the system highly flexible and customizable. At the same time, since it supports different settings for the number of arcing network circuits, it can meet the test requirements of different scales or types, increasing the scope of application of the system.

[0074] In some embodiments, the method further includes: if the total number of arc-drawing network circuits is greater than a threshold value of the number of arc-drawing network circuits corresponding to the controller, increasing the number of arc-drawing jigs and processing multiple arc-drawing jigs in parallel.

[0075] When a single arc-drawing jig cannot meet the needs of a large number of arc-drawing network circuits, by increasing the number of arc-drawing jigs, the capacity limitation of a single device can be overcome to meet larger-scale testing needs. At the same time, as the testing needs grow, costs can be saved by simply adding additional arc-drawing jigs to expand the system capacity instead of replacing the entire system. Through the above settings, the control method provided by the present invention not only solves the problem of insufficient capacity of a single arc-drawing jig, but also improves the efficiency, reliability and test quality of the system, while also simplifying the user's operation and enhancing the flexibility and adaptability of the system.

[0076] The control method of the arc-drawing fixture provided in the embodiment of the present invention adopts a technical means to receive the target string mode input by the user based on the controller in the arc-drawing fixture; and drive and control the switches in the multiple arc-drawing network circuits according to the target string mode to adjust the string modes corresponding to the multiple arc-drawing network circuits to the target string mode. The entire control process realizes fast and accurate string mode adjustment through automation, which greatly improves the test efficiency; users can flexibly adjust the string mode according to different test requirements, so that the system can adapt to more diverse test scenarios. At the same time, it also has the technical effect of simplifying the operation process, improving the accuracy and repeatability of the test results, realizing the efficient management of the arc-drawing network circuit, improving the convenience and accuracy of the test, and enhancing the reliability and adaptability of the system. .

[0077] In order to solve the above problems, one aspect of an embodiment of the present invention provides an arc detection system for a photovoltaic inverter, comprising: a photovoltaic inverter and any one of the above arc-drawing tools; wherein the photovoltaic inverter includes an arc fault detection device.

[0078] Based on the above system, the working status of the photovoltaic inverter can be monitored in real time. Once an arc fault is detected, an alarm can be triggered immediately or protective measures can be taken to prevent the fault from further deteriorating. By using an arc-pulling jig and an arc fault detection device in conjunction with each other, the location of the fault can be more accurately located, making it easier for maintenance personnel to quickly find the problem and repair it. Rapid detection and positioning of faults helps to shorten maintenance time and reduce downtime caused by faults, thereby improving the overall availability of the system. In summary, the arc-pulling detection system provided by the embodiment of the present invention not only improves the safety of the system by integrating advanced detection technologies and equipment, but also enhances the reliability and maintenance efficiency of the system, which is of great significance for ensuring the stable operation of the photovoltaic system.

[0079] An embodiment of the present invention further provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiment of the present invention.

[0080] The embodiment of the present invention further provides a computer program product, including a computer program, wherein the computer program is used to make the computer perform the method of the embodiment of the present invention when executed by a processor of the computer. The computer program product should be understood as a software product that mainly implements the above method of the present application through a computer program.

[0081] An embodiment of the present invention further provides an electronic device, comprising: at least one processor; and a memory in communication with the at least one processor. The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the electronic device executes the method of the embodiment of the present invention.

[0082] refer to Figure 6 , a block diagram of an electronic device that can be used as a server or client of an embodiment of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0083] like Figure 6 As shown, the electronic device includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the electronic device can also be stored. The computing unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0084] Multiple components in the electronic device are connected to the I / O interface 605, including: an input unit 606, an output unit 607, a storage unit 608, and a communication unit 609. The input unit 606 can be any type of device that can input information to the electronic device, and the input unit 606 can receive input digital or character information, and generate key signal input related to user settings and / or function control of the electronic device. The output unit 607 can be any type of device that can present information, and can include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 608 can include but is not limited to a disk, an optical disk. The communication unit 609 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include but is not limited to a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0085] The computing unit 601 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a CPU, a graphics processing unit (GPU), various special artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 601 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 608. In some embodiments, part or all of the computer program may be stored in a ROM.

[0086] 602 and / or the communication unit 609 are loaded and / or installed on the electronic device. In some embodiments, the computing unit 601 can be configured to execute the above method in any other appropriate manner (for example, by means of firmware).

[0087] The computer programs for implementing the methods of the embodiments of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer programs may be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0088] In the context of an embodiment of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, or infrared systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0089] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0090] The information and data involved in the embodiments of the present invention (including but not limited to data used for analysis, stored data, displayed data, etc.) are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or refuse.

[0091] The various steps described in the method implementation methods provided in the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0092] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0093] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the attached claims.

Claims

1. An arc network circuit, characterized in that: The circuit includes a photovoltaic simulation power supply, a decoupling network circuit, and a linear impedance network circuit; wherein, The photovoltaic simulation power supply is connected to the decoupling network circuit and the linear impedance network circuit in sequence via a positive power line and a negative power line, and is used to input direct current; The decoupling network circuit includes a decoupling capacitor and a common-mode filter inductor; wherein the two ends of the decoupling capacitor are respectively connected to the positive power line and the negative power line; and the two coils of the common-mode filter inductor are respectively arranged on the positive power line and the negative power line; The linear impedance network circuit includes multiple line simulation capacitors, multiple bypass simulation capacitors, multiple line simulation inductors and multiple switches. The multiple line simulation capacitors are arranged in parallel and connected to a switch, and are respectively set with different capacitance values; the multiple bypass simulation capacitors are arranged in parallel and connected to another switch, and are respectively set with different capacitance values; the multiple line simulation inductors are arranged in parallel and connected to another switch, and are respectively set with different inductance values; wherein, based on the switching of the switches connected to devices with different capacitance values ​​and inductance values, arc-drawing network circuits with different string modes can be obtained, and the string states include half-string mode, whole-string mode, parallel string mode, and module-level string mode.

2. The circuit according to claim 1, characterized in that The decoupling network circuit further includes a first bypass capacitor, a second bypass capacitor, a first air-core inductor, and a second air-core inductor; wherein one end of the first bypass capacitor is connected to the positive power line, and the other end is grounded; one end of the second bypass capacitor is connected to the negative power line, and the other end is grounded; the first air-core inductor is arranged on the positive power line; the second air-core inductor is arranged on the negative power line; The linear impedance network circuit also includes an analog resistor, which is arranged on the power line.

3. An arc drawing tool, characterized in that: include: A controller and a plurality of arc-drawing network circuits as described in any one of claims 1 to 2; wherein, The controller is connected to the multiple arc-drawing network circuits, and includes a controller chip, a power module, and an information receiving module; wherein the information receiving module is used to receive a target string mode input by a user, the controller chip is used to adjust the string mode of the multiple arc-drawing network circuits according to the received target string mode, and the power module is used to supply power to the controller.

4. The arc drawing tool according to claim 3, characterized in that: The controller also includes a switch driving module, which is used to receive instructions from the controller chip and drive and control the switches in the multiple arc-drawing network circuits according to the instructions, so that the switches are switched to devices corresponding to the target string mode.

5. The arc drawing tool according to claim 3, characterized in that: The controller further includes a temperature sensor module and a cooling module; wherein the temperature sensor module is used to monitor the tool temperature of the arc drawing tool, and the cooling module is used to cool the arc drawing tool.

6. A method for controlling an arc drawing tool, characterized in that: Used to control the arc drawing tool according to any one of claims 3 to 5, the method further comprising: Receive a target string mode input by a user based on a controller in the arc drawing tool; The switches in the plurality of arcing network circuits are driven and controlled according to the target string mode, so as to adjust the string modes corresponding to the plurality of arcing network circuits to the target string mode.

7. The method according to claim 6, characterized in that The method further comprises: During the arc-drawing test based on the adjusted arc-drawing jig, the jig temperature of the arc-drawing jig is monitored in real time based on the temperature sensor module in the controller. If the jig temperature is greater than a temperature threshold, a cooling instruction is generated based on the controller chip, and the cooling module is controlled to cool the arc-drawing jig in response to the cooling instruction until the real-time jig temperature is lower than the temperature threshold.

8. The method according to claim 6, characterized in that The method further comprises: Based on the target number of arc-drawing network circuits received by the controller from the user, the arc-drawing network circuits connected to the arc-drawing metallurgy are adjusted; wherein the target number of arc-drawing network circuits includes the total number of arc-drawing network circuits and the number of arc-drawing network circuits corresponding to each target arc-drawing string mode.

9. The method according to claim 8, characterized in that The method further comprises: If the total number of the arc-drawing network circuits is greater than the arc-drawing network circuit number threshold value corresponding to the controller, the number of the arc-drawing jigs is increased, and a plurality of the arc-drawing jigs are processed in parallel.

10. An arc detection system for a photovoltaic inverter, characterized in that: include: A photovoltaic inverter and an arc-drawing tool as described in any one of claims 3 to 5; wherein the photovoltaic inverter includes an arc fault detection device.

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