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Distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection

A technology of fault line selection and line selection method, applied in directions such as fault location

Active Publication Date: 2014-07-30
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fault line selection problem of the initial phase angle of small faults has always been a difficult point in the distribution network fault line selection. The fault line selection method of the resonant grounded power grid using the shape spectrum is more effective in line selection, but each line selection method has a certain scope of application.

Method used

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  • Distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection
  • Distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection
  • Distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Example 1: Establish as figure 1 The distribution network resonant grounding system shown. The system contains 6 feeders, the neutral point of the zigzag transformer is grounded through the arc suppression coil and series resistance, the power supply is G (infinity), the main transformer is T, the wiring form is YN and d11, and the transformation ratio is 110 kV / 35 kV. TZ is a zigzag transformer, the inductance value of the arc suppression coil is L, and the damping resistance of the arc suppression coil is R. The system feeder is composed of three types of lines: overhead line, overhead line-cable hybrid line and cable line. The load is a constant power load. The parameters of each feeder are: km, is the overhead line; km, is the cable feeder; km, is the overhead line; km, is a cable hybrid feeder, in which the overhead line is 12km, and the cable is 5km; km, is the overhead line; km, is the cable feeder. Among them, all overhead feeders are JS1 pole ty...

Embodiment 2

[0122] Embodiment 2: for such as figure 1 For the resonant grounding system of the distribution network shown, it is now assumed that the feeder at a distance of 10km from the beginning When a single-phase ground fault occurs, the fault moment ms, the fault initial phase angle is 75° (large fault initial angle), the fault transition resistance is 30Ω, the time window length is 5ms, and the sampling frequency is 10kHz. The fault line selection process is as follows: figure 2 shown.

[0123] The zero-sequence current waveform of each feeder is obtained through simulation, and the shape operation is performed on the waveform in the first 1 / 4 cycle after the zero-sequence current fault of each feeder by using flat structural elements, and the shape spectrum under the positive and negative five scales is obtained, and after normalization processing , to obtain the form spectrum of the zero-sequence current of each feeder. Sum the morphological spectrum values ​​under the pos...

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Abstract

The invention relates to a distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection, and belongs to the technical field of electrical power system relay protection. When a single-phase ground fault happens to a resonant grounded power distribution network, the fault line selection method with the pattern spectrum analysis has the good line selection effect on a fault with a small initial phase angel, and the fault line selection method with peak and valley detection of each feeder zero-sequence current in the feature frequency band has the good line selection effect on a fault with a large initial phase angel. The initial phase angles are calculated, the extension theory is combined, extensional fusion is carried out on the two line selection methods with the fault initial phase angles as weight distribution factors, and symbols relevant to confidence coefficients are used as criterions to achieve fault line selection. Specific examples and a large number of simulation experiments show that the method has applicability and reliability on different fault lines, fault distances, transitional resistances and fault initial phase angles.

Description

technical field [0001] The invention relates to a distribution network fault line selection method based on extension fusion of morphological spectrum analysis and morphological peak-valley detection. It belongs to the technical field of electric power system relay protection. Background technique [0002] The boundary conditions of a single-phase ground fault in a resonant grounded system are complex, and the displayed fault characteristics show great differences with the changes of initial phase angle, fault distance, transition resistance and load and other factors. Therefore, there is a risk of misjudgment when simply using a certain component of the fault feature quantity as the feature quantity of the fault line selection criterion, and the risk of misjudgment is higher when the fault feature is not obvious. When a single-phase ground fault occurs in a resonant grounding system and the fault occurs near the voltage overpeak value (large fault initial phase angle), the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 束洪春高利段瑞敏朱梦梦
Owner KUNMING UNIV OF SCI & TECH
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