Assessment of Voltage Nonsinusoidality in Smart Grid Engineering

The article is devoted to assessment of voltage harmonic and interharmonic components generated by semiconductor FACTS devices in an active-adaptive network. The analysis of methods for voltage curve distortions assessment of the electrical network has been carried out. The analysis showed that the existing methods solve particular problems and, as a rule, evaluate nonsinusoidality quantitatively, without taking into consideration the qualitative description of processes in the Smart Grid. There are no techniques that comprehensively assess the order and amplitude of harmonics, multiples and non-multiples of the fundamental frequency. The proposed technique combines the communication theory and the signal graph method, the short-time Fourier transform, the projective geometry theory and allows to estimate the order and amplitude of harmonic and interharmonic distortions in an electrical network with nonstationary parameters, as well as qualitatively describe the dynamics of mode changes in the Smart Grid. It is possible to perform both quantitative and qualitative nonsinusoidal voltage assessment in Smart Grid engineering by means of the developed technique.