A photovoltaic power station electric leakage detection device

Abstract

The utility model discloses a photovoltaic power plant electric leakage detection device, include: control circuit board, detection subassembly, detection subassembly sets up in the input of control circuit board, and detection subassembly includes data acquisition component and electric parameter detection part, and data acquisition component is used for detecting environmental humidity and irradiation condition, and electric parameter detection part is used for detecting the electric parameter of photovoltaic module array, processing component, processing component is integrated on the surface of control circuit board, and processing component is used for the conversion analysis of detection data of detection subassembly, the utility model discloses through data acquisition component and electric parameter detection part to the environmental humidity, irradiation and electric parameter condition of the photovoltaic module array of measured detection, and processing component will detect data through conversion analysis and show the environment and real -time electric parameter condition of photovoltaic module array, help maintenance personnel to find short -circuit electric leakage trouble point, avoid maintenance personnel to disconnect each branch one by one, and the time -consuming operation of detection photovoltaic power plant electric leakage condition.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic testing equipment, and in particular to a leakage current detection device for photovoltaic power stations. Background Technology

[0002] With the large-scale application of photovoltaic power generation systems, system voltages are getting higher and higher, and the number of battery modules connected in series is large. In extreme environments such as high temperature and humidity, PID effect is prone to occur. Especially in solar-fishery complementary photovoltaic power stations, the environment is high temperature and humidity. When the line experiences insulation faults such as short circuits and open circuits for a long time, the photovoltaic modules are in an abnormal state, and the PID effect is more serious, affecting the power generation of the photovoltaic power station.

[0003] Currently, the method for detecting short circuits and leakage faults in photovoltaic power plants requires stopping power generation, disconnecting each branch, and checking the short circuits and leakage of all photovoltaic module arrays one by one. This leakage detection operation consumes maintenance time and affects the restart of the photovoltaic power plant.

[0004] Therefore, in order to solve the problem of time-consuming leakage detection in photovoltaic power plants, a leakage detection device for photovoltaic power plants is needed. Utility Model Content

[0005] The purpose of this invention is to provide a leakage current detection device for photovoltaic power plants to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a photovoltaic power station leakage current detection device, comprising:

[0007] Control circuit board;

[0008] A detection component is provided at the input end of the control circuit board. The detection component includes a data acquisition unit and an electrical parameter detection unit. The data acquisition unit is used to detect the ambient temperature, humidity and irradiance. The electrical parameter detection unit is used to detect the electrical parameters of the photovoltaic module array.

[0009] A processing component, integrated on the surface of a control circuit board, is used for conversion and analysis of detection data from the detection component.

[0010] Preferably, the processing component includes:

[0011] An MCU module, mounted on the surface of the control circuit board, is used for the conversion and analysis of component data.

[0012] A data transmission unit is provided at the data output terminal of the MCU module, and the data transmission unit is used to upload detection data.

[0013] A power supply unit is disposed on the surface of the control circuit board and is used to supply power to the device.

[0014] The display unit is located at the data display output terminal of the MCU module and is used to display the device's operating status and data collected by various sensors.

[0015] Preferably, the data transmission unit includes a 5G module, and the input terminal of the 5G module is electrically connected to the data output terminal of the MCU module.

[0016] Preferably, the power supply unit includes:

[0017] A lithium battery module is disposed on the surface of a control circuit board;

[0018] The power management module has its input terminal electrically connected to the signal control terminal of the lithium battery module, and its output terminal electrically connected to the power input terminal of the MCU module.

[0019] Preferably, the display unit includes an LCD liquid crystal display module, and the input terminal of the LCD liquid crystal display module is electrically connected to the data display output terminal of the MCU module.

[0020] Preferably, the data acquisition component includes:

[0021] A temperature and humidity sensor, wherein the input terminal of the temperature and humidity sensor is electrically connected to the first data input terminal of the MCU module;

[0022] An irradiance sensor, the input terminal of which is electrically connected to the second data input terminal of the MCU module.

[0023] Preferably, the electrical parameter detection unit includes:

[0024] An ADC module, the output of which is electrically connected to the third data input of the MCU module, is used to convert analog electrical parameter signals into digital signals.

[0025] The leakage current transformer has a leakage current detection circuit at the first signal input terminal of the ADC module, and the output terminal of the leakage current transformer is electrically connected to the input terminal of the leakage current detection circuit. The leakage current transformer is used to collect the leakage current value of the photovoltaic module array branch.

[0026] The first current sensor is provided with a first current detection circuit at the second signal input terminal of the ADC module. The output terminal of the first current sensor is electrically connected to the input terminal of the first current detection circuit. The first current sensor is used to collect the current of the positive electrode of the photovoltaic module array in real time.

[0027] The second current sensor is provided with a second current detection circuit at the third signal input terminal of the ADC module. The output terminal of the second current sensor is electrically connected to the input terminal of the second current detection circuit. The second current sensor is used to collect the current of the negative electrode of the photovoltaic module array in real time.

[0028] The high-voltage test probe is equipped with a high-voltage detection circuit at the fourth signal input terminal of the ADC module. The output terminal of the high-voltage test probe is electrically connected to the input terminal of the high-voltage detection circuit. The high-voltage test probe is used to detect the output voltage of the photovoltaic module array in real time.

[0029] The technical effects and advantages of this utility model are as follows:

[0030] This invention uses a data acquisition component and an electrical parameter detection unit in the detection module to detect the ambient temperature, humidity, irradiance, and electrical parameters of the photovoltaic module array. The processing component converts, analyzes, and displays the environment of the photovoltaic module array and the real-time current and voltage status, thereby helping maintenance personnel to find short circuit and leakage faults and avoiding the time-consuming operation of disconnecting each branch to detect leakage in the photovoltaic power station. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall principle of this utility model.

[0032] In the diagram: 1. Control circuit board; 10. First current sensor; 11. Second current sensor; 12. High voltage test probe; 2. Lithium battery module; 201. Power management module; 3. MCU module; 4. ADC module; 5. LCD display module; 6. 5G module; 7. Temperature and humidity sensor; 8. Irradiance sensor; 9. Leakage current transformer. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] This utility model provides, for example Figure 1 As shown:

[0035] Example 1:

[0036] A leakage current detection device for a photovoltaic power station includes: a control circuit board 1, a detection component, and a processing component;

[0037] Specifically, the detection component is located at the input end of the control circuit board 1, and the processing component is integrated on the surface of the control circuit board 1. The processing component is used for the conversion and analysis of the detection data of the detection component.

[0038] It should be noted that the detection component includes a data acquisition unit and an electrical parameter detection unit. The data acquisition unit is used to detect the ambient temperature, humidity and irradiance, while the electrical parameter detection unit is used to detect the electrical parameters of the photovoltaic module array, namely the voltage and current status.

[0039] Specifically, the processing components include: MCU module 3, data transmission unit, power supply unit, and display unit;

[0040] It should be noted that MCU module 3 is used for the conversion and analysis of component data, data transmission unit is used for uploading detection data, power supply unit is used for powering the device, and display unit is used for displaying the device's operating status and the data collected by each sensor.

[0041] Specifically, the MCU module 3 is disposed on the surface of the control circuit board 1, the data transmission unit is disposed on the data output terminal of the MCU module 3, the power supply unit is disposed on the surface of the control circuit board 1, and the display unit is disposed on the data display output terminal of the MCU module 3;

[0042] It should be noted that the MCU module 3 references the working principle of the STM32F103C8T6 controller. The power supply section includes: lithium battery module 2 and power management module 201. Lithium battery module 2 is disposed on the surface of control circuit board 1. The input terminal of power management module 201 is electrically connected to the signal control terminal of lithium battery module 2, and the output terminal of power management module 201 is electrically connected to the power input terminal of MCU module 3. Lithium battery module 2 supplies power to MCU module 3 through power management module 201, enabling MCU module 3 to work.

[0043] Specifically, the power management module 201 refers to the working principle of the MT9805 battery management chip. The data transmission unit includes a 5G module 6, and the input terminal of the 5G module 6 is electrically connected to the data output terminal of the MCU module 3.

[0044] It should be noted that the MCU module 3 can upload the measured data to the Internet through the 5G module 6, which makes it convenient for maintenance personnel to monitor the data obtained by the MCU module 3 through the Internet. The display unit includes an LCD liquid crystal display module 5, and the input terminal of the LCD liquid crystal display module 5 is electrically connected to the data display output terminal of the MCU module 3.

[0045] Specifically, the LCD display module 5 facilitates maintenance and inspection personnel in checking the leakage status of the photovoltaic module array.

[0046] Example 2:

[0047] A leakage current detection device for a photovoltaic power station includes: a control circuit board 1, a detection component, and a processing component;

[0048] Specifically, the detection component is integrated on the surface of the control circuit board 1. The detection component includes a data acquisition component and an electrical parameter detection unit. The data acquisition component is used to detect the ambient temperature, humidity and irradiance, and the electrical parameter detection unit is used to detect the electrical parameters of the photovoltaic module array.

[0049] The processing component is integrated on the surface of the control circuit board 1, and the processing component is used for the conversion and analysis of the detection data of the detection component.

[0050] The processing components include: MCU module 3, data transmission unit, power supply unit, and display unit;

[0051] Specifically, MCU module 3 is disposed on the surface of control circuit board 1. MCU module 3 is used for the conversion and analysis of detection component data. Data transmission unit is disposed on the data output terminal of MCU module 3. Data transmission unit is used to upload detection data. Power supply unit is disposed on the surface of control circuit board 1. Power supply unit is used to power the device. Display unit is disposed on the data display output terminal of MCU module 3. Display unit is used to display the device operating status and data collected by each sensor.

[0052] The data acquisition components include: a temperature and humidity sensor 7 and an irradiance sensor 8;

[0053] Specifically, the input terminal of the temperature and humidity sensor 7 is electrically connected to the first data input terminal of the MCU module 3, and the input terminal of the irradiance sensor 8 is electrically connected to the second data input terminal of the MCU module 3.

[0054] It should be noted that the temperature and humidity sensor 7 refers to the working principle of the DHT21 sensor, which is a single-wire serial interface digital temperature and humidity sensor with anti-interference capability. The irradiance sensor 8 refers to the working principle of the DAQ-GP-LR4G sensor, which adopts the photoelectric principle and can measure solar radiation in the spectral range of 0.3-3μm.

[0055] The electrical parameter detection unit includes: ADC module 4, leakage current transformer 9, first current sensor 10, second current sensor 11, and high voltage detection probe 12;

[0056] Specifically, the output terminal of ADC module 4 is electrically connected to the third data input terminal of MCU module 3. The first signal input terminal of ADC module 4 is equipped with a leakage current detection circuit, and the output terminal of leakage current transformer 9 is electrically connected to the input terminal of the leakage current detection circuit. The second signal input terminal of ADC module 4 is equipped with a first current detection circuit, and the output terminal of first current sensor 10 is electrically connected to the input terminal of the first current detection circuit. The third signal input terminal of ADC module 4 is equipped with a second current detection circuit, and the output terminal of second current sensor 11 is electrically connected to the input terminal of the second current detection circuit. The fourth signal input terminal of ADC module 4 is equipped with a high voltage detection circuit, and the output terminal of high voltage detection probe 12 is electrically connected to the input terminal of the high voltage detection circuit.

[0057] It should be noted that the ADC module 4 is used to convert analog electrical parameter signals into digital signals, the leakage current transformer 9 is used to collect the leakage current value of the photovoltaic module array branch, the first current sensor 10 is used to collect the current of the positive terminal of the photovoltaic module array in real time, and the second current sensor 11 is used to collect the current of the negative terminal of the photovoltaic module array in real time.

[0058] Specifically, the ADC module 4 refers to the working principle of the ADS7864 analog-to-digital converter. The signals output by the leakage current transformer 9, the first current sensor 10, the second current sensor 11 and the high voltage detection probe 12 are analog signals, such as voltage and current. The ADC module 4 converts the analog signals into digital signals and inputs them to the MCU module 3.

[0059] It should be noted that the first current sensor 10 and the second current sensor 11 work together to obtain the current difference on the positive and negative lines, thereby obtaining the magnitude of the branch leakage current. Its current detection range is 1.00–30.00A. The high-voltage detection probe 12 is used to detect the output voltage of the photovoltaic module array in real time. The high-voltage detection probe 12 references the working principle of the LTC6102 voltage comparator, and its voltage detection range is 10–2000V.

[0060] In practical use, the data acquisition component and electrical parameter detection unit in the detection module detect the ambient temperature and humidity, irradiance and electrical parameters of the photovoltaic module array. The processing component converts and analyzes the detection data to display the environment of the photovoltaic module array and the real-time current and voltage status, thereby helping maintenance personnel to find short circuit and leakage fault points, avoiding the time-consuming operation of disconnecting each branch to detect leakage in the photovoltaic power station.

[0061] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leakage current detection device for a photovoltaic power station, characterized in that, include: Control circuit board (1); The detection component is located at the input end of the control circuit board (1). The detection component includes a data acquisition component and an electrical parameter detection unit. The data acquisition component is used to detect the ambient temperature, humidity and irradiance. The electrical parameter detection unit is used to detect the electrical parameters of the photovoltaic module array. A processing component, integrated on the surface of a control circuit board (1), is used for conversion and analysis of detection data from the detection component; the processing component includes: MCU module (3), the MCU module (3) is disposed on the surface of the control circuit board (1), the MCU module (3) is used for conversion analysis of component data; The data transmission unit is located at the data output terminal of the MCU module (3) and is used to upload detection data. A power supply unit is disposed on the surface of the control circuit board (1) and is used to supply power to the device; The display unit is located at the data display output terminal of the MCU module (3) and is used to display the device operating status and data collected by each sensor; The power supply unit includes: a lithium battery module (2), which is disposed on the surface of the control circuit board (1); a power management module (201), the input terminal of which is electrically connected to the signal control terminal of the lithium battery module (2), and the output terminal of which is electrically connected to the power input terminal of the MCU module (3); the electrical parameter detection unit includes: ADC module (4), the output terminal of the ADC module (4) is electrically connected to the third data input terminal of the MCU module (3), the ADC module (4) is used to convert the analog signal of electrical parameters into a digital signal; Leakage current transformer (9), the first signal input terminal of the ADC module (4) is provided with a leakage current detection circuit, the output terminal of the leakage current transformer (9) is electrically connected to the input terminal of the leakage current detection circuit, and the leakage current transformer (9) is used to collect the leakage current value of the photovoltaic module array branch. The first current sensor (10) is provided with a first current detection circuit at the second signal input terminal of the ADC module (4). The output terminal of the first current sensor (10) is electrically connected to the input terminal of the first current detection circuit. The first current sensor (10) is used to collect the current of the positive electrode of the photovoltaic module array in real time. The second current sensor (11) is provided with a second current detection circuit at the third signal input terminal of the ADC module (4). The output terminal of the second current sensor (11) is electrically connected to the input terminal of the second current detection circuit. The second current sensor (11) is used to collect the current of the negative electrode of the photovoltaic module array in real time. The high voltage detection probe (12) is provided with a high voltage detection circuit at the fourth signal input terminal of the ADC module (4). The output terminal of the high voltage detection probe (12) is electrically connected to the input terminal of the high voltage detection circuit. The high voltage detection probe (12) is used to detect the output voltage of the photovoltaic module array in real time.

2. The photovoltaic power station leakage current detection device according to claim 1, characterized in that, The data transmission unit includes a 5G module (6), and the input terminal of the 5G module (6) is electrically connected to the data output terminal of the MCU module (3).

3. The photovoltaic power station leakage current detection device according to claim 1, characterized in that, The display unit includes an LCD liquid crystal display module (5), and the input terminal of the LCD liquid crystal display module (5) is electrically connected to the data display output terminal of the MCU module (3).

4. The photovoltaic power station leakage current detection device according to claim 1, characterized in that, The data acquisition components include: a temperature and humidity sensor (7), the input terminal of which is electrically connected to the first data input terminal of the MCU module (3); and an irradiance sensor (8), the input terminal of which is electrically connected to the second data input terminal of the MCU module (3).

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