Research of Nonsinusoidality in Smart Grid via Short-time Fourier Transform

• DOI: 10.1109/icoecs52783.2021.9657424
• Publication Date: 2022-01-04T20:35:55Z
• Authors: Elena Sosnina; Rustam Bedretdinov; Anton Ivanov
• Keywords: Window function; Harmonic Analysis; Frequency grid; Harmonic

The article is devoted to the study of higher harmonics and interharmonics in a Smart Grid with thyristor voltage regulators distributed generation sources. analysis various methods for assessing electrical network nonsinusoidality carried out. It established that most suitable method based on short-time Fourier transform. Various window functions are analyzed their comparative characteristics given. following criteria selected evaluate effectiveness windows: main-lobe beamwidth peak sidelobe; maximum conversion losses; dependence frequency offset noise level; errors estimating frequency, amplitude phase harmonic. Chebyshev turned out be effective evaluating Grid. Simulink model segment has been developed, basis which amplitude-frequency spectrum obtained. research results have shown transform using successfully solves problem