| 摘要 |
The invention relates to a method for detecting a temporary disturbance in a power supply voltage signal, comprising: sampling a power supply voltage signal u(t); producing a difference signal ud(t) by subtracting each sample from a cycle of the voltage, of a temporary duration T, the sample corresponding to a previous cycle being previously stored in a memory as a reference signal; applying a discrete wavelet transform to said difference signal ud(t) in order to decompose said difference signal ud(t) into a plurality of frequency bands, obtaining a plurality of coefficients dij; calculating an energy vector Edi on the basis of said plurality of coefficients dij; and detecting the existence or otherwise of a temporary disturbance, on the basis of said energy vector Edi,. The invention also relates to a system for detecting a temporary disturbance in a power supply voltage signal, and to a computer program comprising computer program encoding means suitable for performing the steps of the above-mentioned method. |
