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This paper presents a grid synchronization method based on the implementation of sliding Goertzel discrete Fourier transform (SGDFT). The conventional phase locked loop (PLL) exhibits large phase error, be difficult to implement, and their performance is also indistinct under conditions where the grid frequency varies or the supply is distorted with high frequency harmonics. In the proposed SGDFT show a robust phase tracking capability with fast transient response under distorted grid conditions. The sampling frequency is adjusted to correct the phase errors by the SGDFT filter whenever variation in the frequency or harmonics

Modelling of Sliding Goertzel DFT (SGDFT) Based Phase Detection System for Grid Synchronization under Distorted Grid Conditions