Power line detection device and method for distributed photovoltaic power generation

Abstract

The invention discloses a distributed photovoltaic power generation power line detection device and method, and the device comprises a photovoltaic panel and a DC line used for power transmission, the photovoltaic panel is fixedly connected with a photosensitive sensor, and the photosensitive sensor is electrically connected with a signal receiving and processing module. The photovoltaic panel is provided with an electric detection structure used for detecting the use state of the direct-current line, the electric detection structure comprises a base fixedly connected with the photovoltaic panel, the base is fixedly connected with an induction coil, the line where the direct-current line is located penetrates through the induction coil, and the base is further fixedly connected with an electromagnetic coil. According to the invention, through the arrangement of the electric measurement structure, the illumination intensity and the current change in the direct current line can be monitored in real time, and the real-time monitoring can ensure that the system can master the working state of the photovoltaic panel at any time, so that the system can be used for monitoring the working state of the photovoltaic panel at any time. And accurate environment feedback is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit detection, and in particular to a distributed photovoltaic power generation power line detection device and method. Background Art

[0002] Distributed photovoltaic power generation refers to a form of power generation that uses solar photovoltaic modules to directly convert solar energy into electrical energy. Its characteristic is that the power generation system is dispersedly arranged near the user or the place where electricity is used, and is usually installed on the roof, balcony, etc. of the building. Unlike centralized photovoltaic power generation, distributed photovoltaic power generation systems are generally smaller in scale, and the power generated is mainly used for local consumption, and some of the surplus electricity can be connected to the power grid.

[0003] Chinese patent (Announcement No.: CN118112464B), the scheme specifically includes a base, on which are arranged in sequence: a first terminal, on which a plurality of first power terminals are arranged; a second terminal, on which a plurality of second power terminals are arranged; a reeling mechanism and an unreeling mechanism, located between the first terminal and the second terminal, for reeling one end of the cable and unreeling the other end; a guiding mechanism, located between the reeling mechanism and the unreeling mechanism, for guiding the cable to move in a spiral; a detection iron rod, located in the guiding mechanism, when the cable is guided by the guiding mechanism to move in a spiral, the detection iron rod is located on the central axis of the spiral cable; a detection mechanism, located at one end of the detection iron rod, for detecting the magnetic field strength of the detection iron rod at this end. This application realizes the spiral movement of the cable to be tested through the guiding mechanism, and with the help of the detection mechanism to detect the magnetic field strength of the detection iron rod, the short-circuit part of the cable can be detected quickly and more comprehensively.

[0004] The operating environment of the existing distributed photovoltaic power generation system is complex and changeable, and is easily affected by external factors such as light intensity fluctuations and abnormal current changes. The existing line detection device is difficult to detect and respond to abnormal conditions within the system in a timely manner, especially when there are sudden situations such as short circuits or current fluctuations in the DC line. The system is easily damaged. Therefore, a power line detection device and method for distributed photovoltaic power generation are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a distributed photovoltaic power generation power line detection device and method, which has the advantages of judging whether there is abnormal current fluctuation in the line and timely cutting off the line current when a short circuit occurs, thereby solving the problem that the system is easily damaged when a DC line short circuit or current fluctuation occurs.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a distributed photovoltaic power generation power line detection device and method, comprising a photovoltaic panel and a DC line for power transmission, a photosensitive sensor is fixedly connected to the photovoltaic panel, the photosensitive sensor is electrically connected to a signal receiving and processing module, and an electrical measurement structure for detecting the use status of the DC line is provided on the photovoltaic panel; The electrical measurement structure includes a base fixedly connected to the photovoltaic panel, an induction coil fixedly connected to the base, a DC line passing through the induction coil, an electromagnetic coil fixedly connected to the base, the electromagnetic coil and the induction coil are electrically connected to form a closed circuit; The base is provided with a pressure sensor, the pressure of which changes according to the change of the current value of the closed circuit where the electromagnetic coil is located, and the pressure sensor is electrically connected to the signal receiving and processing module; The base is also provided with a closed-circuit component for cutting off the line in which the DC line is located when a short circuit occurs.

[0007] Preferably, the base is provided with a middle seat, and a slot body is provided on the base for the middle seat to be slidably connected in the vertical direction, the pressure sensor is fixedly connected to the middle seat, and one end of the middle seat facing the electromagnetic coil is fixedly connected with a metal column that is magnetically attracted to the electromagnetic coil after power is supplied; The middle seat is provided with a connecting column, and one end of the connecting column facing the pressure sensor is provided with a pressure block which is in contact with the pressure sensor.

[0008] Preferably, a blocking block is fixedly connected to the middle seat, and a round hole is provided on the blocking block for the connecting column to slide through, and an extension column is fixedly connected to one end of the pressing block facing the connecting column, and a receiving hole is provided on the connecting column for the extension column to slide through; A return spring is arranged in the receiving hole, and the two ends of the return spring are respectively fixedly connected to the extension column and the connecting column; The middle seat is provided with a stop group for limiting the position of the connection column.

[0009] Preferably, the pressure block is in compression contact with the pressure-receiving end of the pressure sensor in an initial state, and the return spring is in a compressed state.

[0010] Preferably, the stop assembly comprises a side seat fixedly connected to the connecting column, a vertical slide groove for the side seat to slide in the vertical direction is provided on the middle seat, and a clamping block is fixedly connected to the side seat; The base is fixedly connected with a side plate, the side plate is provided with a middle swing rod which can swing freely in the vertical direction, and the middle swing rod is fixedly rotated on the side plate, and a triangular cone block is fixedly connected with the middle swing rod corresponding to the position of the clamping block; The triangular pyramid block is in abutment connection with the clamping block in an initial state.

[0011] Preferably, the middle swing rod is provided with an integrally formed inner angle surface at one end close to the clamping block, and the blocking block is provided with an integrally formed end bevel portion at a position corresponding to the inner angle surface, and the inner angle surface and the end bevel portion are in sliding contact with each other.

[0012] Preferably, the closed-circuit component includes a V-shaped swing arm coaxially fixed with the middle swing arm, a movable copper plate for connecting electricity is fixedly connected to the end of the V-shaped swing arm, a positioning copper plate for connecting electricity is fixedly connected to the base, both the movable copper plate for connecting electricity and the positioning copper plate for connecting electricity are electrically connected to the DC line, and the movable copper plate for connecting electricity and the positioning copper plate for connecting electricity are in contact with each other in an initial state and the line where the DC line is located is unobstructed.

[0013] Preferably, the signal receiving and processing module includes an analog-to-digital converter that converts the received photosensitive signal and pressure signal from analog signals to digital signals, and also includes a digital signal processing unit that filters, compares and analyzes the converted digital signals to determine whether there is any abnormality in the working state of the DC line; The signal receiving and processing module is electrically connected to the terminal module, and the signal receiving and processing module includes a remote communication module for transmitting the processed signal to the terminal module.

[0014] Preferably, a method for detecting a power line of a distributed photovoltaic power generation system is applied to a power line of a distributed photovoltaic power generation system, comprising the following steps: S1. Signal acquisition: The photosensitive sensor and pressure sensor installed on the photovoltaic panel monitor the light intensity and pressure signals respectively. The photosensitive sensor captures the light intensity in real time, and the pressure sensor monitors the pressure change caused by the current change. These signals are transmitted in analog form. The analog signals are input to the analog-to-digital converter to convert them into digital signals, and the digital signals enter the signal receiving and processing module for preliminary processing, including signal filtering and noise removal, to ensure the accuracy of the signal; S2. Current abnormality detection: When the current changes in the DC line, the induction coil generates an induced current, and the electromagnetic coil generates a magnetic field change. The pressure sensor senses the current change in the DC line by detecting the pressure fluctuation caused by the magnetic field change and generates a corresponding pressure signal; The signal receiving and processing module digitally processes the collected light signals and pressure signals, and compares and analyzes the received signals through a preset algorithm to determine whether there is abnormal current fluctuation in the working state of the DC line; S3, protection mechanism triggering: when the signal receiving and processing module detects a short circuit in the DC line, the closed-circuit component is triggered to cut off the current in the DC line to prevent the abnormal current from causing damage to other components of the system; S4. Remote monitoring: The processed signal is transmitted to the terminal module through the remote communication module. The terminal module receives and analyzes the signal, provides real-time remote monitoring function, ensures the stability of the system operation, and can make corresponding maintenance decisions based on the transmitted signal.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can monitor the light intensity and the current change in the DC line in real time by setting up an electrical measurement structure. This real-time monitoring can ensure that the system can grasp the working status of the photovoltaic panel at any time and provide accurate environmental feedback.

[0016] 2. The present invention can efficiently detect current anomalies in DC lines through the combined action of the induction coil and the electromagnetic coil. The pressure fluctuation captured by the pressure sensor is proportional to the current change. The signal receiving and processing module can quickly analyze these signals and promptly determine whether there is abnormal current fluctuation in the line.

[0017] 3. When the signal receiving and processing module in the present invention detects a short circuit or other serious abnormality in the DC line, the closed-circuit component will be triggered immediately to cut off the line current to prevent the abnormal current from damaging other components of the system. This mechanism ensures the safety of the system and avoids equipment damage and operational failures caused by short circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the components where the induction coil of the present invention is located; Figure 3 It is a schematic diagram of the components where the electromagnetic coil of the present invention is located; Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the components where the blocking block of the present invention is located; Figure 7 This is a schematic diagram of the components where the V-shaped swing arm of the present invention is located; Figure 8 This is a schematic diagram of the components where the connecting column of the present invention is located; Fig. 9 The present invention is a schematic flow chart of a detection method of a distributed photovoltaic power generation power line detection device.

[0019] In the figure: 1. Photovoltaic panel; 2. Photosensitive sensor; 3. Base; 4. Middle seat; 5. Side seat; 6. Vertical slide; 7. DC line; 8. Block; 9. End bevel; 10. Connecting column; 11. Extension column; 12. Pressing block; 13. Pressure sensor; 14. Reset spring; 15. Block; 16. Middle swing arm; 17. Inner angle surface; 18. Triangular cone block; 19. Side plate; 20. V-shaped swing arm; 21. Movable copper sheet for connection to electricity; 22. Positioning copper sheet for connection to electricity; 23. Induction coil; 24. Electromagnetic coil; 25. Metal column. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 9 The present invention provides a technical solution: a distributed photovoltaic power generation power line detection device, comprising a photovoltaic panel 1 and a DC line 7 for power transmission, wherein a photosensitive sensor 2 is fixedly connected to the photovoltaic panel 1, and the photosensitive sensor 2 is electrically connected to a signal receiving and processing module, and an electrical measurement structure for detecting the use status of the DC line 7 is provided on the photovoltaic panel 1; The electrical measurement structure includes a base 3 fixedly connected to the photovoltaic panel 1, an induction coil 23 fixedly connected to the base 3, the DC line 7 passes through the induction coil 23, and an electromagnetic coil 24 is also fixedly connected to the base 3, the electromagnetic coil 24 and the induction coil 23 are electrically connected to form a closed circuit; The base 3 is provided with a pressure sensor 13, which changes the pressure according to the change of the current value of the closed circuit where the electromagnetic coil 24 is located, and the pressure sensor 13 is electrically connected to the signal receiving and processing module; The base 3 is also provided with a closed-circuit component for cutting off the DC line 7 when a short circuit occurs.

[0022] like Figure 1 , Figure 2 and Fig. 9 As shown, the photovoltaic panel 1 converts light energy into direct current, and transmits the direct current to the photovoltaic converter through the direct current line 7, and converts the direct current into alternating current that can be used in household or industrial power grids through the photovoltaic converter, wherein the current value on the direct current line 7 is related to the power generation efficiency of the photovoltaic panel 1, wherein the main factor affecting the power generation efficiency of the photovoltaic panel 1 is the light factor.

[0023] Among them, the light intensity irradiated thereon is monitored in real time by a photosensitive sensor 2 arranged on the photovoltaic panel 1, and the detected light signal is transmitted to the signal receiving and processing module. At the same time, when the light intensity remains unchanged and the components on the photovoltaic panel 1 are in normal operation, the DC current on the DC line 7 is stable and unchanged, so the magnetic field is also stable and unchanged. When the current on the DC line 7 changes, according to Faraday's law of electromagnetic induction, the current in the induction coil 23 is generated only when the magnetic flux changes. Therefore, when the current in the DC line 7 changes, it can drive the closed circuit where the induction coil 23 is located to have current, and the current value in the closed circuit is proportional to the amplitude of the change of the DC current in the DC line 7.

[0024] At the same time, when current appears in the closed circuit where the induction coil 23 is located, a magnetic field will be generated at the position of the electromagnetic coil 24, and the pressure exerted on the pressure sensor 13 will be changed through the change of the magnetic force of the magnetic field. The pressure value exerted on the pressure sensor 13 is proportional to the current value of the closed circuit where the induction coil 23 is located, that is, the greater the change of the DC current at the DC line 7, the greater the current value in the closed circuit where the induction coil 23 and the electromagnetic coil 24 are located, and thus the greater the pressure value exerted on the pressure sensor 13.

[0025] Among them, the pressure sensor 13 transmits the real-time pressure signal it receives to the signal receiving and processing module, the signal receiving module processes the received light signal and pressure signal, and remotely transmits the processed signal to the terminal module. Among them, if a short circuit occurs in the DC line 7, the current thereon will increase sharply, causing the magnetic field thereon to change sharply and causing an induced current to be generated in the closed circuit where the induction coil 23 is located, which will drive the pressure on the pressure sensor 13 to reach the maximum value. By analyzing and processing the pressure signal and judging the value of the pressure sensor 13, it can be determined whether a short circuit occurs in the DC line 7.

[0026] At the same time, when the pressure on the pressure sensor 13 reaches the maximum value, the closed-circuit component arranged on the base 3 can be driven to operate. Under the drive of the closed-circuit component, the line where the DC line 7 is located can be cut off, thereby avoiding short circuit phenomenon and causing damage to the components electrically connected thereto.

[0027] At the same time, in actual use, if the current value at the DC line 7 fluctuates, current appears in the closed circuit of the induction coil 23 and the electromagnetic coil 24 arranged on the DC line 7, and the current value is related to the current fluctuation amplitude at the DC line 7, wherein the current value in the closed circuit where the induction coil 23 and the electromagnetic coil 24 are located determines the pressure value exerted on the pressure sensor 13, wherein, when the pressure signal of the pressure sensor 13 changes and the light signal remains unchanged, the current fluctuation at the DC line 7 is not caused by the change of the light factor.

[0028] Therefore, when the illumination signal remains unchanged but the change amplitude of the pressure signal exceeds the set value, it may indicate that there is an abnormality in the DC line 7 or its components. It may be that a joint or connection point on the DC line 7 has poor contact, which may cause the current to change instantaneously at that point, causing the DC line 7 to sense abnormal current. In addition, some components in the photovoltaic system may age or fail, resulting in current fluctuations, which are not caused by changes in illumination.

[0029] In one of the more preferred embodiments, the base 3 is provided with a middle seat 4, and a slot body 1 is provided on the base 3 for the middle seat 4 to be slidably connected in the vertical direction, the pressure sensor 13 is fixedly connected to the middle seat 4, and one end of the middle seat 4 facing the electromagnetic coil 24 is fixedly connected with a metal column 25 that is magnetically attracted to the electromagnetic coil 24 after power is supplied; The middle seat 4 is provided with a connecting column 10 , and one end of the connecting column 10 facing the pressure sensor 13 is provided with a pressure block 12 which is in contact with the pressure sensor 13 .

[0030] The middle seat 4 is fixedly connected with an end bevel 9, and a round hole is provided on the end bevel 9 for the connecting column 10 to slide through, and an extension column 11 is fixedly connected to one end of the pressing block 12 facing the connecting column 10, and a receiving hole is provided on the connecting column 10 for the extension column 11 to slide through; A return spring 14 is arranged in the receiving hole, and two ends of the return spring 14 are respectively fixedly connected to the extension column 11 and the connecting column 10 . A stop assembly for limiting the position of the connecting column 10 is arranged on the middle seat 4 .

[0031] In the initial state, the pressure block 12 is in compression contact with the pressure-receiving end of the pressure sensor 13 , and the return spring 14 is in a compressed state.

[0032] like Figure 2 , Figure 3 , Figure 6 and Figure 8 As shown, a middle seat 4 which can move freely in the vertical direction is provided on the base 3. When there is a current value in the closed circuit where the electromagnetic coil 24 is located, a magnetic force that attracts the metal column 25 appears at the position of the electromagnetic coil 24, thereby driving the metal column 25 to move in the vertical direction. The magnetic force at the electromagnetic coil 24 is related to the current value of the closed circuit where it is located. Therefore, the greater the current value in the closed circuit where the electromagnetic coil 24 is located, the greater the displacement of the metal column 25 and the middle seat 4 fixed thereunder in the vertical direction.

[0033] At the same time, in the initial state, the pressure block 12 is already in contact connection with the pressure sensor 13, and the return spring 14 is already in a compressed state. At this time, the pressure sensor 13 has been subjected to an initial pressure value. When the pressure sensor 13 moves in the vertical direction, the middle seat 4 drives the pressure sensor 13 to move downward, thereby driving the pressure block 12 and the extension column 11 to move downward, and causing the return spring 14 to further compress and deform. At the same time, when the return spring 14 is further compressed and deformed, it can increase the pressure value applied to the pressure sensor 13. Then, the current value in the closed circuit where the electromagnetic coil 24 is located determines the pressure value received by the pressure sensor 13.

[0034] At the same time, when the current value at the DC line 7 changes more, the current value in the closed circuit where the induction coil 23 and the electromagnetic coil 24 are located becomes larger, and thus the pressure value received by the pressure sensor 13 becomes larger. Therefore, the circuit fluctuation amplitude at the DC line 7 is determined by the size of the pressure signal received by the signal receiving and processing module. At the same time, combined with the received light signal, it is determined whether the current fluctuation at the DC line 7 is caused by the light factor. If the light signal remains unchanged and the pressure signal changes by more than the set value, it may be that the DC line 7 or its components are abnormal.

[0035] At the same time, under the restriction of the resisting assembly, when the middle seat 4 drives the pressure sensor 13 to move downward, the height of its connecting column 10 will not change. Therefore, a relative displacement will occur between the middle seat 4 and the connecting column 10, and the reset spring 14 will be driven to further compress and deform. When the middle seat 4 drives the resistance block 8 to move to the set position, the reset spring 14 is in a state of maximum compression deformation. At this time, the pressure sensor 13 is subjected to the maximum pressure value, and in the subsequent movement of the middle seat 4, the connecting column 10 will also move downward, and drive the reset spring 14 to restore the elastic deformation, and be able to drive the closed-circuit assembly to operate.

[0036] Furthermore, the stop assembly includes a side seat 5 fixedly connected to the connecting column 10, a vertical slide groove 6 is provided on the middle seat 4 for the side seat 5 to slide in the vertical direction, and a clamping block 15 is fixedly connected to the side seat 5; The base 3 is fixedly connected with a side plate 19, and a middle swing rod 16 is provided on the side plate 19, which is free to swing in the vertical direction. The middle swing rod 16 is fixedly rotated on the side plate 19, and a triangular cone block 18 is fixedly connected to the middle swing rod 16 at a position corresponding to the clamping block 15; The triangular pyramid block 18 is in abutting connection with the clamping block 15 in an initial state.

[0037] The middle swing rod 16 has an integrally formed inner angle surface 17 at one end close to the clamping block 15 , and the blocking block 8 has an integrally formed end bevel 9 at a position corresponding to the inner angle surface 17 , and the inner angle surface 17 and the end bevel 9 are in sliding contact with each other.

[0038] like Figure 2-Figure 4 As shown, when the center seat 4 moves downward, due to the abutment connection between the blocking block 15 provided on the side seat 5 and the triangular cone block 18, the movement of the center seat 4 will not drive the side seat 5 to move synchronously. In this process, since the connecting column 10 and the side seat 5 are fixedly arranged, the connecting column 10 will have a relative displacement with the extension column 11, thereby driving the reset spring 14 to further undergo compression deformation, thereby increasing the pressure value of the pressure sensor 13.

[0039] At the same time, when the middle seat 4 drives the end inclined portion 9 arranged thereon to move downward, the distance between the blocking block 8 and the middle swing rod 16 can be gradually reduced, thereby driving the inner angle surface 17 at the end of the middle swing rod 16 to slide in contact with the end inclined portion 9 on the blocking block 8, and when the blocking block 8 contacts the end inclined portion 9, the middle swing rod 16 can deflect in the vertical direction, thereby making the triangular cone block 18 in the middle swing rod 16 disengage from the blocking block 15. At this time, the blocking block 15 on the side seat 5 is no longer restricted by the triangular cone block 18. At this time, the return spring 14 can restore the elastic deformation and prompt the side seat 5 to move downward, thereby driving the closed-circuit component to operate.

[0040] Based on the embodiment of the resisting component, the closed-circuit component includes a V-shaped swing arm 20 coaxially fixed with the middle swing arm 16, a movable power-connecting copper sheet 21 is fixedly connected to the end of the V-shaped swing arm 20, a positioning power-connecting copper sheet 22 is fixedly connected to the base 3, both the movable power-connecting copper sheet 21 and the positioning power-connecting copper sheet 22 are electrically connected to the DC line 7, the movable power-connecting copper sheet 21 and the positioning power-connecting copper sheet 22 are in contact with each other in the initial state and the line where the DC line 7 is located is unobstructed.

[0041] like Figure 3 , Figure 5 and Figure 7 As shown, when the middle swing rod 16 deflects in the vertical direction, it can drive the V-shaped swing rod 20 coaxially arranged with the middle swing rod 16 to deflect synchronously, thereby driving the movable power-connecting copper sheet 21 at the end of the V-shaped swing rod 20 to swing, so as to cause the V-shaped swing rod 20 to separate from the movable power-connecting copper sheet 21. In the initial state, the movable power-connecting copper sheet 21 contacts the positioning power-connecting copper sheet 22, and the line where the DC line 7 is located is unblocked. When the movable power-connecting copper sheet 21 separates from the positioning power-connecting copper sheet 22, the line where the DC line 7 is located can be cut off, thereby preventing the DC line 7 from being short-circuited. The line where the DC line 7 is located can be cut off in time, thereby preventing the components electrically connected thereto from being damaged when a short circuit occurs.

[0042] Furthermore, the signal receiving and processing module includes an analog-to-digital converter that converts the received photosensitive signal and pressure signal from analog signals into digital signals, and also includes a digital signal processing unit that filters, compares and analyzes the converted digital signals to determine whether there is any abnormality in the working state of the DC line 7; The signal receiving and processing module is electrically connected to the terminal module, and the signal receiving and processing module includes a remote communication module for transmitting the processed signal to the terminal module.

[0043] like Figure 1 As shown, the signal receiving and processing module first receives the photosensitive signal and the pressure signal through the photosensitive sensor 2 and the pressure sensor 13. The signals captured by these sensors are input into the analog-to-digital converter in analog form. The converter accurately converts the received analog signal into a digital signal for subsequent processing. The converted digital signal enters the digital signal processing unit, which first filters the signal to remove noise and interference to ensure the accuracy and stability of the signal.

[0044] The digital signal processing unit compares and analyzes the filtered signal, and determines whether there is any abnormality in the working state of the DC line 7 corresponding to the signal through preset algorithms and parameters. If an abnormality is detected, the digital signal processing unit will generate a corresponding alarm or prompt signal for further processing.

[0045] The processed signal is transmitted to the terminal module through the signal receiving and processing module. The signal receiving and processing module is integrated with a remote communication module, which is responsible for transmitting the analysis results and processed signal information to the remote terminal device via wireless or wired means. This process ensures that the system can monitor the operating status of the DC line 7 in real time and make corresponding operation or maintenance decisions when necessary.

[0046] A method for detecting a power line of a distributed photovoltaic power generation system, applied to the power line detection system of the distributed photovoltaic power generation system, comprises the following steps: S1, signal acquisition: the light sensor 2 and pressure sensor 13 installed on the photovoltaic panel 1 monitor the light intensity and pressure signals respectively. The light sensor 2 captures the light intensity in real time, and the pressure sensor 13 monitors the pressure change caused by the current change. These signals are transmitted in analog form; The analog signals are input to the analog-to-digital converter to convert them into digital signals, and the digital signals enter the signal receiving and processing module for preliminary processing, including signal filtering and noise removal, to ensure the accuracy of the signal; S2. Current abnormality detection: When the current in the DC line 7 changes, the induction coil 23 generates an induced current, and the electromagnetic coil 24 generates a magnetic field change accordingly. The pressure sensor 13 senses the current change in the DC line 7 by detecting the pressure fluctuation caused by the magnetic field change, and generates a corresponding pressure signal; The signal receiving and processing module digitally processes the collected light signal and pressure signal, compares and analyzes the received signals through a preset algorithm, and determines whether there is abnormal current fluctuation in the working state of the DC line 7; S3, protection mechanism triggering: when the signal receiving and processing module detects a short circuit in the DC line 7, the closed-circuit component is triggered to cut off the current in the DC line 7 to prevent the abnormal current from causing damage to other components of the system; S4, remote monitoring: The processed signal is transmitted to the terminal module through the remote communication module. The terminal module receives and analyzes the signal, provides a real-time remote monitoring function, ensures the stability of the operation of the system where the photovoltaic panel 1 is located, and can make corresponding maintenance decisions based on the transmitted signal.

[0047] like Fig. 9 As shown, in the signal acquisition stage, the photosensor 2 and the pressure sensor 13 installed on the photovoltaic panel 1 are used to monitor the light intensity and the pressure signal respectively. The photosensor 2 captures the ambient light intensity in real time to ensure that the system can sense the working conditions of the photovoltaic panel 1. At the same time, the pressure sensor 13 monitors the pressure fluctuation caused by the current change in the DC line 7. After these analog signals are collected, they are input into the analog-to-digital converter and converted into digital signals. These digital signals then enter the signal receiving and processing module for preliminary processing, including filtering and denoising, to ensure the accuracy and reliability of the signal.

[0048] In the current anomaly detection stage, the current change in the DC line 7 will cause the induction coil 23 to generate an induced current, and the electromagnetic coil 24 will generate a magnetic field change. The pressure sensor 13 senses the current change in the DC line 7 by detecting the pressure fluctuation caused by the magnetic field change generated by the electromagnetic coil 24, and generates a corresponding pressure signal. The signal receiving and processing module further digitally processes the collected light signal and pressure signal, and compares and analyzes the signals through a preset algorithm, so as to determine whether the working state of the DC line 7 has abnormal current fluctuations.

[0049] When the signal receiving and processing module detects a short circuit in the DC line 7, the protection mechanism triggering stage is entered. At this time, the closed-circuit component is quickly triggered to cut off the current in the DC line 7 to prevent the abnormal current from damaging other components in the system. The immediate response of this protection mechanism effectively reduces the system risk caused by the short circuit and ensures the safety of the photovoltaic power generation system.

[0050] During the remote monitoring stage, the processed signals are transmitted to the terminal module through the remote communication module. After receiving these signals, the terminal module conducts further analysis and processing. Through real-time monitoring, the system can ensure the stability of the photovoltaic power generation device. At the same time, it also provides signal support for managers, so that they can make corresponding maintenance decisions based on the monitored information, thereby maintaining the long-term and reliable operation of the system.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distributed photovoltaic power generation power line detection device, comprising a photovoltaic panel (1) and a DC line (7) for power transmission, characterized in that: The photovoltaic panel (1) is fixedly connected to a photosensitive sensor (2), the photosensitive sensor (2) is electrically connected to a signal receiving and processing module, and the photovoltaic panel (1) is provided with an electrical measurement structure for detecting the use status of the DC line (7); The electrical measurement structure comprises a base (3) fixedly connected to the photovoltaic panel (1), an induction coil (23) fixedly connected to the base (3), a DC line (7) passing through the induction coil (23), an electromagnetic coil (24) fixedly connected to the base (3), the electromagnetic coil (24) and the induction coil (23) being electrically connected to form a closed circuit; The base (3) is provided with a pressure sensor (13) which changes the pressure in response to changes in the current value of the closed circuit in which the electromagnetic coil (24) is located, and the pressure sensor (13) is electrically connected to the signal receiving and processing module; The base (3) is also provided with a closed-circuit component for cutting off the DC line (7) when a short circuit occurs in the DC line (7).

2. A distributed photovoltaic power generation power line detection device according to claim 1, characterized in that: The base (3) is provided with a middle seat (4), and the base (3) is provided with a slot body for the middle seat (4) to be slidably connected in a vertical direction, the pressure sensor (13) is fixedly connected to the middle seat (4), and one end of the middle seat (4) facing the electromagnetic coil (24) is fixedly connected to a metal column (25) that is magnetically attracted to the electromagnetic coil (24) when energized; A connecting column (10) is provided on the middle seat (4), and a pressure block (12) that is abuttingly connected to the pressure sensor (13) is provided at one end of the connecting column (10) that faces the pressure sensor (13).

3. A distributed photovoltaic power generation power line detection device according to claim 2, characterized in that: The middle seat (4) is fixedly connected to a stop block (8), and the stop block (8) is provided with a circular hole for the connecting column (10) to slide through; the pressing block (12) is fixedly connected to an extension column (11) at one end facing the connecting column (10), and the connecting column (10) is provided with a receiving hole for the extension column (11) to slide through; A return spring (14) is arranged in the receiving hole, and two ends of the return spring (14) are respectively fixedly connected to the extension column (11) and the connecting column (10); The middle seat (4) is provided with a stop assembly for limiting the position of the connection column (10).

4. A distributed photovoltaic power generation power line detection device according to claim 3, characterized in that: The pressure block (12) is in compression contact with the pressure-receiving end of the pressure sensor (13) in an initial state, and the return spring (14) is in a compressed state.

5. A distributed photovoltaic power generation power line detection device and method according to claim 4, characterized in that: The stop assembly comprises a side seat (5) fixedly connected to the connecting column (10), a vertical slide groove (6) for the side seat (5) to be slidably connected in a vertical direction is provided on the middle seat (4), and a clamping block (15) is fixedly connected to the side seat (5); The base (3) is fixedly connected to a side vertical plate (19), the side vertical plate (19) is provided with a middle swing rod (16) that can swing freely in a vertical direction, and the middle swing rod (16) is rotated on the side vertical plate (19) with a fixed axis, and a triangular cone block (18) is fixedly connected to the middle swing rod (16) at a position corresponding to the clamping block (15); The triangular pyramid block (18) is in abutting connection with the clamping block (15) in an initial state.

6. A distributed photovoltaic power generation power line detection device according to claim 5, characterized in that: An end of the middle swing rod (16) close to the clamping block (15) is provided with an integrally formed inner angle surface (17), and the blocking block (8) is provided with an integrally formed end oblique portion (9) at a position corresponding to the inner angle surface (17), and the inner angle surface (17) and the end oblique portion (9) are in sliding contact with each other.

7. A distributed photovoltaic power generation power line detection device according to claim 6, characterized in that: The closed-circuit component comprises a V-shaped swing arm (20) fixed coaxially with the middle swing arm (16); a movable copper plate (21) is fixedly connected to the end of the V-shaped swing arm (20); a positioning copper plate (22) is fixedly connected to the base (3); both the movable copper plate (21) and the positioning copper plate (22) are electrically connected to the DC line (7); the movable copper plate (21) and the positioning copper plate (22) are in contact with each other in an initial state and the DC line (7) is unobstructed.

8. A distributed photovoltaic power generation power line detection device according to claim 7, characterized in that: The signal receiving and processing module comprises an analog-to-digital converter for converting the received photosensitive signal and pressure signal from analog signals into digital signals, and also comprises a digital signal processing unit for filtering, comparing and analyzing the converted digital signals to determine whether there is any abnormality in the working state of the DC line (7); The signal receiving and processing module is electrically connected to the terminal module, and the signal receiving and processing module includes a remote communication module for transmitting the processed signal to the terminal module.

9. A method for detecting a power line of a distributed photovoltaic power generation system, applied to a power line detection system of a distributed photovoltaic power generation system as claimed in any one of claims 1 to 8, comprising the following steps: S1. Signal acquisition: The light sensor (2) and pressure sensor (13) installed on the photovoltaic panel (1) monitor light intensity and pressure signals respectively. The light sensor (2) captures light intensity in real time, and the pressure sensor (13) monitors pressure changes caused by current changes. These signals are transmitted in analog form. The analog signals are input to the analog-to-digital converter to convert them into digital signals, and the digital signals enter the signal receiving and processing module for preliminary processing, including signal filtering and noise removal, to ensure the accuracy of the signal; S2. Current abnormality detection: When the current in the DC line (7) changes, the induction coil (23) generates an induced current, and the electromagnetic coil (24) generates a magnetic field change accordingly. The pressure sensor (13) senses the current change in the DC line (7) by detecting the pressure fluctuation caused by the magnetic field change, and generates a corresponding pressure signal; The signal receiving and processing module performs digital processing on the collected light signal and pressure signal, compares and analyzes the received signals through a preset algorithm, and determines whether there is abnormal current fluctuation in the working state of the DC line (7); S3, protection mechanism triggering: when the signal receiving and processing module detects a short circuit condition in the DC line (7), the closed-circuit component is triggered to cut off the current in the DC line (7) to prevent the abnormal current from causing damage to other components of the system; S4. Remote monitoring: The processed signal is transmitted to the terminal module via the remote communication module. The terminal module receives and analyzes the signal, provides a real-time remote monitoring function, ensures the stability of the operation of the system where the photovoltaic panel (1) is located, and can make corresponding maintenance decisions based on the transmitted signal.

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