A new method for grid-tie inverters synchronization based on RDFT with linear approximation

A new method based on linear approximation of RDFT is presented in this paper which will provide a computation reduction as well as high accuracy in tracking the fundamental in distorted grid during synchronization. Due to recent developments combined with the increasing of power demand by single phase nonlinear loads, voltage spikes, harmonics and DC component had affected on the electric grid quality. These effects make Synchronization a challenge where filters or DSP analysers are required to acquire the fundamental component as a consequence to the waveform deformation. Applying DFT “Discrete Fourier Transform” using DSP processors can be one of the best solutions to find the waveform parameters. However DFT is combined with high mathematical computations and required using advanced microprocessors to be applied in real-time.