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Method for generating voltage deviation accuracy detection waveform

A technology for detecting waveform and voltage deviation, which is applied in the field of power quality index detection, and can solve the problems that the accuracy of voltage deviation does not meet the standard requirements.

Inactive Publication Date: 2015-09-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the accuracy of the detection waveform given by some instruments according to the standard meets the requirements, but the accuracy of the actual voltage deviation does not meet the standard requirements.

Method used

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  • Method for generating voltage deviation accuracy detection waveform
  • Method for generating voltage deviation accuracy detection waveform
  • Method for generating voltage deviation accuracy detection waveform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, in this example, the nominal voltage U N =220V, a set of detection waveforms is set as: the effective value of the basic waveform is U 1 =0; mark waveform f x =50Hz, U x Value range: 176V≤U x ≤264V, interval ΔU between adjacent waveform voltage RMS x = 8V, U x They are: 176, 184, 192, 200, 208, 216, 224, 232, 240, 248, 256. in figure 1 Draw the waveform group corresponding to the above valid values.

Embodiment 2

[0031] Embodiment 2, in this example, a set of detection waveforms is set as: the effective value U of the basic waveform 1 =U N =220V, the frequency is f=50Hz; the marked waveform Mark the frequency f of the waveform x =50Hz, U x Value range: 0≤U x ≤145, the interval between adjacent waveform voltage RMS values ​​is ΔU x =13V, choose U discretely and evenly x value, U x The values ​​are 0, 13, 26, 39, 52, 65, 78, 91; 104, 117, 130 respectively. in figure 2 is the detection waveform group corresponding to the effective value of the above-mentioned marked waveform, image 3 is drawn separately figure 2 U in x =78V detection waveform, including basic waveform and marker waveform, the dotted line in the figure is the fundamental wave, the thin solid line is the marker waveform, and the thick solid line is the detection waveform.

Embodiment 3

[0032] Embodiment 3, in this example, a set of detection waveforms is set as: the effective value U of the basic waveform 1 =0; mark waveform u x =220V, frequency f x The range satisfies: 0x ≤575Hz, discrete uniform selection of f x , select the frequency interval Δf between adjacent waveforms x =5Hz, the selected first marker waveform frequency is f x0 =75Hz, the selected frequency values ​​are: 75, 80, 85, 90, 95, 100, 105, 110, 115, 120. Figure 4 Indicates the effective value of the basic waveform U 1 =0 and mark waveform u x =220V, f x is a set of sinusoidal waveforms containing the above values.

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Abstract

The invention discloses a method of producing a voltage deviation accuracy detection waveform. The voltage deviation accuracy detection waveform is formed by superimposing a basic waveform and a labeling waveform; the effective valve range of the combined waveform is 0.8UN-1.2UN, wherein UN is the nominal voltage of a system where an object to be detected is; the basic waveform is a sine wave of which the frequency f is equal to 50Hz; the basic time unit of the basic waveform is 10-cyclic wave; the effective value of the basic waveform is U1 which has two valves, 0 or UN respectively; the frequency of the labeling waveform is a sine wave of which the frequency is fx; the basic time unit of the labeling waveform is 10-cyclic wave; the effective value of the labeling waveform is Ux; phi is a phase angle of the labeling waveform; and the range of the phase angel is 0 degree-360 degrees. According to the invention, six groups of detection waveforms aiming at the voltage deviation accuracy of a power quality monitoring device can be formed.

Description

Technical field: [0001] The invention belongs to the technical field of power quality index detection. Background technique: [0002] In recent years, with the increasing power load demanded by the power grid and the diversification of power load types, while meeting the power load requirements, the power quality problems brought by the load to the power grid have become more and more serious. One of the important indicators of quality evaluation, voltage deviation refers to the degree of deviation of the actual voltage from the nominal voltage. [0003] At present, there are many instruments for measuring voltage deviation on the market. For the measurement of the accuracy of voltage deviation of various instruments, standards and experience have not given a comprehensive and clear detection waveform group for the accuracy of voltage deviation of power quality index measuring instruments. , the detection waveform provided by the national standard GB / T 19862-2005 is 0.8U N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02G01R22/06
Inventor 黄学良方鑫朱妍蒋莉曲小慧
Owner SOUTHEAST UNIV
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