A Quantitative Analysis Method of Composite Power Quality Disturbance Signal

Abstract

A composite electric energy quality disturbance signal quantitative analysis method comprises the following steps of a symbolizing the original electric energy quality disturbance signal timing sequence data; b positioning the beginning and ending moments of a disturbance signal; c analyzing the components of an electric energy quality disturbance signal. According to the present invention, a method of comparing the Euclidean distances in the cycle periods is adopted to detect the disturbance beginning and ending moments, and a new method of improving the fuzzy, overshoot and mode mixing problems in the conventional Hilbert-Huang transform (HHT) and in the disturbance waveform sudden change regions is established. The method of the present invention has a better decomposition effect on the dual composite electric energy quality disturbance signals, is similarly suitable for the single electric energy quality disturbance signal, facilitates managing the electric energy quality and analyzing the potential interference, and also has the reference meaning for the electric energy quality early stage early warning.

Description

technical field [0001] The invention relates to the field of power quality signal analysis, in particular to a quantitative analysis method for composite power quality disturbance signals. Background technique [0002] With the development of science and technology, new energy sources such as photovoltaics and wind power in the power system have begun to be connected to the grid on a large scale. Cutting and other factors cause the continuous deterioration of power quality. Power quality problems have a serious impact on production and life, such as harmonics causing heating of cables, transformers, capacitors and other equipment; transient peaks causing power failures of sensitive equipment; voltage surges and dips causing equipment failures. In addition, all kinds of precision electrical equipment have higher and higher requirements on power quality. [0003] The increasingly prominent contradictions above make it more and more important to study power quality issues. T...

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Problems solved by technology

[0006] In order to overcome the shortcomings that the existing power quality disturbance signal analysis method cannot accurately decompose the signal and cannot meet the requirements of composite disturbance analysis in the power system, the purpose of the present invention is to provide a method that can accurately analyze the composite power quality disturbance signal The components are decomposed, and the quantitative analysis method of the composite power quality disturbance signal at the start and end moments of each disturbance is located

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