Electric energy quality regulation method, voltage temporary change detection method and dynamic voltage restorer
A detection method and grid voltage technology, applied in the direction of measuring current/voltage, measuring only voltage, measuring electrical variables, etc., can solve the problems of inaccurate voltage quality detection and large amount of calculation, so as to reduce the impact, suppress the impact of noise, reduce The effect of time delay
Inactive Publication Date: 2019-12-03
XUJI GRP +2
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[0005] The purpose of the present invention is to provide a power quality adjustment, a voltage transient detection method and a dynamic voltage restorer, which are used to solve the problems of large calculation and inaccurate voltage quality detection methods in the prior art
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[0031] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings:
[0032] The present invention provides a voltage transient detection method, which includes the following steps:
[0033] (1) Collect the grid voltage signal, select the decomposition scale, and perform the initial wavelet transformation on the grid voltage to obtain the wavelet coefficients of the first frequency band and the second frequency band; on the basis of ensuring the delay characteristics, the wavelet function disappears The order of moments should be as large as possible. For example, the order of vanishing moments of wavelet transform should be greater than the first set value to meet the accuracy of wavelet fundamental analysis. Among them, the first frequency band is smaller than the second frequency band, and the lowest frequency is In the first frequency range, the highest frequency is cut off as the second frequency range;
[0034...
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The invention provides an electric energy quality regulation method, voltage temporary change detection method and dynamic voltage restorer. The voltage temporary change detection method comprises thefollowing steps: acquiring an electric grid voltage signal, selecting a decomposition scale, performing initial wavelet transformation, and acquiring wavelet coefficients of a first set frequency band and a second frequency band; performing single reconstruction for the wavelet coefficient of the first frequency band, and acquiring a fundamental wave signal of the electric grid voltage; performing secondary wavelet transformation, acquiring a first frequency band component and a second frequency band component; performing single reconstruction for the second frequency band component, and determining start and stop time of occurrence of voltage temporary change; and performing single reconstruction for the first frequency band component, and determining fundamental wave electric grid voltage temporary amplitude information. Double wavelet transformations are used for detection of the voltage signal containing temporary change and harmonic waves, based on wavelet transformation multiresolution analysis characteristics and singularity detection property, decoupling of harmonic waves and temporary change electric energy quality problems is solved, noise influence is restrained, accurate positioning of a temporary change signal is completed, time delay can be reduced effectively, and influence on electric grid real-time compensation is reduced.
Description
Technical field [0001] The invention belongs to the technical field of power grid quality adjustment, and particularly relates to a method for power quality adjustment, voltage transient detection and a dynamic voltage restorer. Background technique [0002] In the past few decades, power quality issues have caused huge economic losses in the power system, and power quality issues have received more and more attention from scientific researchers and engineers. When the current or voltage signal in the power system is disturbed by power quality problems, the amplitude and frequency components of the current or voltage signal will change. According to the characteristics of different changes, common power quality problems are divided into two categories: one is power quality problems based on amplitude changes, such as voltage swells, voltage sags, and instantaneous voltage interruptions; the other is Power quality problems dominated by frequency changes, such as transient oscilla...
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IPC IPC(8): G01R19/00H02J3/12
CPCG01R19/0084H02J3/12
Inventor 黄利军许丹李献伟翟登辉毋炳鑫谢卫华张敬安王雷涛王毅李博张彦龙李民赵中华
Owner XUJI GRP
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