Research of interharmonic measurement algorithm on power parameters

The leakage and picket effects of discrete Fourier transform make it unable to measure the interharmonics of power systems. The windowed interpolating DFT can measure the interharmonics, while it needs the construction of window functions, which make the implementation and analysis complex. Simple transform in the frequency domain and multi-spectrum-line interpolation correction algorithm (MICA) instead of windowing functions and gives the corresponding interpolating algorithms. Matlab shows the algorithm has the character of simple implementation and high precision. Therefore, it presents a satisfy tool for measurement of interharmonics in power systems.