New energy current collection line tower fault positioning device

Abstract

A new energy current collection line tower fault positioning device comprises a current sensor, a signal conditioning module, an A / D sampling module, an MCU data processing module, a power supply module, a data storage module and a communication module. According to the utility model, the structure is novel, the current sensor converts the earth current of a tower into a weak voltage signal, the signal conditioning module filters and amplifies the weak signal, the A / D conversion module converts an analog signal into a digital signal and transmits the digital signal to the MCU processing module, and the converted digital signal is convenient to process, store and transmit. The precision requirement of the device is ensured, meanwhile, the input cost of the device can be reduced, large-scale application is facilitated, and the device conforms to the actual engineering site.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy power generation, transmission on -line monitoring and fault location technical field, especially relates to a new energy power collection line tower fault location device. BACKGROUND

[0002] At present, domestic new energy power generation station mainly is photovoltaic and wind power mainly, and basically all adopt the mode of distributed power generation, centralized step-up and delivery, and a large number of power collection lines are needed between the two for power collection, and the number of towers for supporting lines is particularly large.Operation statistics shows that the fault points of power collection lines are mostly located at towers, and are mostly caused by insulation damage, and then ground and phase-to-phase short circuit faults are caused.

[0003] When the power collection line occurs ground fault, for the system neutral point without direct ground, it can still operate for a period of time, but the overvoltage potential risk brought by this still has great harm to the operating line, is easy to further develop into phase-to-phase short circuit fault, and then leads to line trip, and serious fault will also lead to the whole station unable to generate electricity, and the second closing needs to find the fault point, and can only be carried out after the fault is eliminated, and a large amount of manpower and time are often needed to complete this work, leading to the stop of power generation time greatly extended, thereby bringing huge economic losses to the power plant, and part of the faults that cannot be checked also threaten the safe operation of the power grid.Therefore, the fast and effective fault location measure can greatly reduce the fault checking time, and plays a real-time monitoring role on the operating line, which has important significance for improving the reliability of power supply of the power grid and improving the economic benefit of the power plant. SUMMARY

[0004] The utility model wants to solve the technical problem to provide a new energy power collection line tower fault location device, the tower ground current is converted into weak voltage signal through current sensor, and weak signal is filtered and amplified through signal conditioning module, and then analog signal is converted into digital signal transmission MCU processing module through AD conversion module, and the converted digital signal is convenient to handle, is convenient for storage and transmission, can also realize the investment cost of device is reduced under the requirement of ensuring the precision of device, is favorable to large-scale investment use, and meets the actual engineering site.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0006] A new energy power collection line tower fault location device, including current sensor, signal conditioning module, AD sampling module, MCU data processing module, power module, data storage module and communication module;

[0007] The MCU data processing module is connected with the data storage module, the AD sampling module, the communication module and the power module respectively;

[0008] The A / D sampling module is connected with the signal conditioning module.

[0009] The signal conditioning module is connected with the current sensor.

[0010] Preferably, the current sensor is used to convert the tower grounding current signal into a weak voltage signal.

[0011] Preferably, the signal conditioning module is used to amplify and filter the output signal of the current sensor.

[0012] Preferably, the A / D sampling module is used to convert the output signal of the signal conditioning module into a digital signal through A / D conversion and transmit the digital signal to the MCU data processing module.

[0013] Preferably, the MCU data processing module is used to process the A / D sampled data, and perform calculation and threshold comparison to realize state monitoring and fault feature identification.

[0014] Preferably, the power module is used to power the entire device.

[0015] Preferably, the data storage module is used to store the sampling and analysis data.

[0016] Preferably, the communication module is used to transmit the collected and processed data.

[0017] The utility model discloses can reach following beneficial effects:

[0018] (1) the utility model discloses novel structure, through current sensor, tower grounding current is converted into weak voltage signal, and then weak signal is filtered, amplified through signal conditioning module, and then analog signal is converted into digital signal through A / D conversion module and is transmitted to MCU processing module, and the digital signal after conversion is convenient to handle, is convenient for storage and transmission, can realize reducing the investment cost of device while ensuring the requirement of device precision, is favorable to large -scale investment use, and conforms to actual engineering site.

[0019] (2) the utility model discloses through A / D sampling tower grounding current signal, when the line normal operation, can measure weak unbalanced induction grounding current, can be used to evaluate line operation insulation state, when the current -collecting line fails at tower, grounding current increases, can be used as fault feature, and data is transmitted to main station through wireless module, and the main station can accurately locate the tower position of fault occurrence according to the data that each monitoring point gathers.

[0020] (3) the utility model discloses device can make tower level positioning to current -collecting line grounding fault, can greatly reduce fault search time, helps the fault line fast power recovery, reduces the power failure time, improves economic efficiency and power supply reliability. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in connection with the drawings and embodiments:

[0022] Figure 1 The utility model module connection diagram.

[0023] In the figure: 1-current sensor, 2-signal conditioning module, 3-A / D sampling module, 4-MCU data processing module, 5-power module, 6-data storage module, 7-communication module. DETAILED DESCRIPTION

[0024] Preferred scheme as Figure 1 The utility model discloses a new energy power collection line tower fault positioning device, including current sensor, signal conditioning module, A / D sampling module, MCU data processing module, power module, data storage module, communication module;

[0025] MCU processing module 4 is connected with data storage module 6, A / D sampling module 3, communication module 7, power module 5 respectively;

[0026] A / D sampling module 3 is also connected with signal conditioning module 2.

[0027] Signal conditioning module 2 is also connected with current sensor 1.

[0028] The current sensor is used to convert tower ground current signal into weak voltage signal;

[0029] Signal conditioning module is used to amplify and filter processing current sensor output signal, reduces noise, improves signal-to-noise ratio;

[0030] A / D sampling module is used to convert signal conditioning module output signal into digital signal transmission MCU data processing module through A / D conversion;

[0031] MCU data processing module is used to process A / D sampled data, and carries out calculation and threshold value comparison, realizes state monitoring, fault feature identification and other functions;

[0032] The power module is used to power supply the whole device, satisfies the demand of voltage of each module of the device;

[0033] The data storage module is used to store sampling and analysis data, so as to be uploaded to the main station through communication module in subsequent communication.

[0034] The communication module is used to transmit the data of collection and processing, and is convenient for subsequent platform analysis;

[0035] As Figure 1As shown, when the device is installed at the bottom of the tower, the current sensor is used to convert the tower ground current signal into a weak voltage signal; the signal conditioning module amplifies and filters the output signal of the current sensor, reduces noise, and improves the signal-to-noise ratio; then the A / D sampling module converts it into a digital signal and transmits it to the MCU data processing module.

[0036] In the present embodiment, the MCU data processing module 4 carries out digital filtering processing on the data collected by the A / D sampling module 3, removes random interference signals, and then carries out FFT analysis and calculation on the sampling data, and obtains the amplitude of the fundamental wave and each harmonic, and the effective value of the measured signal. When the line is in normal operation, the tower will induce a weak unbalanced voltage signal due to the influence of the distributed parameters and voltage imbalance, and a weak unbalanced current through the grounding return circuit product, and by continuously monitoring the current, the operation state of the tower can be effectively evaluated; when the line at the tower occurs grounding fault, a sudden current will be generated, thereby providing characteristic data for fault identification and positioning.

[0037] The data storage module 6 is used to store sampling and analysis data, so as to be uploaded to the main station through the communication module 7 in subsequent communication;

[0038] In the present embodiment, the communication module transmits the collected and processed data, so that the remote platform can further analyze and display the data, and the operation and maintenance personnel can continuously monitor the state of the power collection line, and also can real-time view the operation state of the device.

[0039] The current sensor 1 preferably adopts the SC02 broadband current sensor of Kunming Hua Han Electronics Technology, with a bandwidth ≥200kHz, a power frequency accuracy of 0.5S, and a maximum measurement current of 2kA;

[0040] The MCU data processing module adopts the ARM chip STM32F103VET6 of STMicroelectronics: the chip has a main frequency of 72MHZ, rich on-chip resources, and can be extended with external RAM, external FLASH, and storage devices such as SD card and U disk.

[0041] Working principle: the tower ground current is converted into a weak voltage signal by a current sensor, and then the weak signal is filtered and amplified by a signal conditioning module, and then the analog signal is converted into a digital signal by an A / D conversion module and transmitted to the MCU processing module for digital filtering processing to remove random interference signals, and then the sampling data is analyzed and calculated by FFT to obtain the amplitude of the fundamental wave and each harmonic, and the effective value of the measured signal. When the line is in normal operation, the tower will induce a weak unbalanced voltage signal due to the influence of the distributed parameters and voltage imbalance, and a weak unbalanced current through the grounding loop product, and by continuously monitoring the current, the tower operation state can be effectively evaluated; when the line at the tower occurs grounding fault, a sudden current is generated, thereby providing characteristic data for fault identification and positioning, and finally completing fault positioning.

[0042] The above-mentioned embodiments are only preferred technical solutions of the present application, and should not be regarded as limiting the present application. The protection scope of the present application should be based on the technical solutions recited in the claims, including equivalent replacement solutions of the technical features recited in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A new energy power collection line tower fault location device, characterized in that: The current sensor, a signal conditioning module, an A / D sampling module, an MCU data processing module, a power module, a data storage module and a communication module are included. The MCU data processing module is connected with the data storage module, the A / D sampling module, the communication module and the power module respectively. The A / D sampling module is connected with the signal conditioning module. The signal conditioning module is connected with the current sensor.

2. The new energy power collection line tower fault location device according to claim 1, characterized in that: The current sensor is used to convert the tower ground current signal into a weak voltage signal.

3. The new energy power collection line tower fault location device according to claim 1, characterized in that: The signal conditioning module is used to amplify and filter the output signal of the current sensor.

4. The new energy power collection line tower fault location device according to claim 1, characterized in that: The A / D sampling module is used to convert the output signal of the signal conditioning module into a digital signal through A / D conversion and transmit the digital signal to the MCU data processing module.

5. The new energy power collection line tower fault location device according to claim 1, characterized in that: The MCU data processing module is used to process the A / D sampled data, calculate and compare the threshold value, realize state monitoring and fault feature identification.

6. The new energy power collection line tower fault location device according to claim 1, characterized in that: The power module is used to power the entire device.

7. The new energy power collection line tower fault location device according to claim 1, characterized in that: The data storage module is used to store sampling and analysis data.

8. The new energy power collection line tower fault location device according to claim 1, characterized in that: The communication module is used to transmit the collected and processed data.

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