Composite electric energy quality disturbance signal quantitative analysis method

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.