Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient
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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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[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
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[0069] Example 1:
[0070] (1) Assuming that a single-phase grounding fault with constant transition resistance occurs on line L2 at a distance of 13 kilometers from the busbar, and the fault ends after 100ms, the zero-sequence current waveforms of lines L1, L2, L3, and L4 are respectively as follows figure 2 , image 3 , Figure 4 , Figure 5 shown.
[0071] (2) Intercept the zero-sequence current waveform of 4 lines from 0ms to 20ms after the fault, such as Image 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 grounding fault occurs on line L2.
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[0074] Example 2:
[0075] (1) Assuming that a single-phase grounding fault with constant transition resistance occurs on line L1 20 kilometers away from the bus, the fault ends after 100ms, and the zero-sequence current waveforms of lines L1, L2, L3, and L4 are respectively as follows Image 6 , Figure 7 , Figure 8 , Figure 9 shown.
[0076] (2) Intercept the 0ms to 20ms zero-sequence current waveform of the 4 lines after the fault, such as Figure 11 As shown, the data is brought into matlab for Spearman correlation coefficient calculation, 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 grounding fault occurs 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...
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