Decomposition of dynamic electrical signals with Wavelet Synchrosqueezed

There are practical cases in which a measured voltage or current signal of an electrical grid have harmonics and oscillations with multiple frequencies and non-linear behavior. Traditionally, the electrical signal analysis tools are based in the Fourier Theory, ideal for stationary-linear signals. Therefore, a time-frequency analysis based on the Wavelet Synchrosqueezed Transform (WSST) is proposed in this paper. Three electrical signals are here analyzed: 1) Synthetic voltage control signal, 2) Harmonic oscillation and 3) Electromagnetic transient response. From the obtained results, it can be seen that the WSST reduces the spectral spots clarifying the time-frequency plane, from which it is possible to identify the displacement of the oscillation modes with more energy content.