Measurement of harmonics and interharmonics using FFT-based algorithm

The power line pollution from both harmonics and interharmonics has raised increasing concerns in power system due to a large of number power electronics applications in industry. Although DFT or FFT is a widely used tool for harmonics/interharmonics measurement, it may cause incorrect results when the waveform is non-periodic. Therefore, this paper aims to develop the FFT-based algorithm to measure harmonics/interharmonics more accurately based on simple algebra equations. All dispersed power occurred from FFT can be restored to recover the amplitude, and the individual frequency component can be obtained effectively. The performance results show that the proposed model is feasible for efficient measurement in harmonics/interharmonics.

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