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Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient

A technology for single-phase ground faults and collector lines, which is applied to the fault location, detects faults according to conductor types, and measures electricity, etc., to achieve simplified judgment process, high sampling rate, and true and reliable judgment results

Active Publication Date: 2020-12-15
KUNMING UNIV OF SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The conventional zero-sequence current protection of wind farms is a certain value. In order to take into account the reliability of the protection when the high resistance is grounded, the sensitivity of the protection setting is increased, which may cause the zero-sequence current of the healthy line to exceed the set value when the collector line has a metallic fault. verb: move

Method used

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  • Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient
  • Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient
  • Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient

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Embodiment 1

[0070] (1) Assuming that a single-phase ground fault with constant transition resistance occurs on line L2 at a distance of 13 kilometers from the bus, and it ends after 100ms after the fault occurs, the zero-sequence current waveforms of lines L1, L2, L3, and L4 are as follows: figure 2 , image 3 , Figure 4 , Figure 5 shown.

[0071] (2) After intercepting the fault, the zero-sequence current waveform of the four lines from 0ms to 20ms is as follows: Figure 6 As shown, the data is brought into matlab to calculate the Spearman correlation coefficient, and the calculation result is:

[0072]

[0073] (3) After comparison, the Spearman correlation coefficients of line L2 and other lines are all less than 0, and the Spearman correlation coefficients of other lines are all greater than 0, so it can be judged that a single-phase ground fault has occurred on line L2.

Embodiment 2

[0075] (1) Assuming that a single-phase ground fault with constant transition resistance occurs on line L1 at a distance of 20 kilometers from the bus, and the fault ends after 100 ms, the zero-sequence current waveforms of lines L1, L2, L3, and L4 are as follows: Figure 6 , Figure 7 , Figure 8 , Figure 9 shown.

[0076] (2) After intercepting the fault, the zero-sequence current waveform of the four lines from 0ms to 20ms is as follows: Figure 11 As shown, the data is brought into matlab to calculate the Spearman correlation coefficient, and the calculation result is:

[0077]

[0078] (3) After comparison, the Spearman correlation coefficients of line L1 and other lines are all less than 0, and the Spearman correlation coefficients of other lines are all greater than 0, so it can be judged that a single-phase ground fault has occurred on line L1.

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Abstract

The invention relates to a wind power plant current collection line single-phase earth fault line selection method based on a correlation coefficient, and belongs to the technical field of power system relay protection. New energy output is weak, noise is high, a large number of higher harmonics are contained during faults, many difficulties are caused to fault line selection, and if a current collection line of a wind power plant is not cut off in time after the faults occur, accidents of adjacent draught fans, lines and even the wind power plant can be possibly caused, and large-scale off-grid is caused. According to the method, the single-phase earth fault is set as the fault line along the line on the current collection line of the wind power plant through electromagnetic transient simulation, the zero-sequence current of the fault line is extracted, and comparison is performed according to the correlation degree of the zero-sequence current waveforms of multiple lines so as to deduce the fault line. The method can recognize the correlation coefficient of the fault line and the non-fault line, is suitable for the fault line selection of a plurality of current collection lines of a wind power plant, simplifies the judgment process, and is real and reliable in judgment result.

Description

[0001] The invention relates to a single-phase grounding fault line selection method of a wind farm collector line based on a correlation coefficient, and belongs to the technical field of electric power system relay protection. Background technique [0002] With the rapid development of economy and society, mankind is facing an increasingly severe energy crisis, and the development of renewable and clean energy has become a development strategy for countries all over the world. Due to its relatively flexible investment scale and relatively low development costs, wind energy has become one of the most promising and fastest-growing renewable energy sources. [0003] Nowadays, the construction of wind farms in my country is usually guided by wind resources. The areas rich in wind resources are mostly areas with harsh geographical environments such as mountain tops, canyons, and seas. The probability of failure of wind farm collector lines is extremely high. Large-scale wind powe...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/085G01R31/088G01R31/52G01R31/58
Inventor 束洪春林少鹏董俊绕鸿江
Owner KUNMING UNIV OF SCI & TECH
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