Harmonic and Interharmonic Estimation Using CUMSUM Technique Along with ESPRIT in Modern Electrical Power System

This paper deals with accurately estimating harmonics/interharmonics in the modern electrical power system. The sources of interharmonics and the problems that are caused by them have also been discussed. This paper uses a cumsum based method for estimating the number of frequency components present in the signal along with estimation of signal parameter based rotational invariance method to obtain the signal attributes. For test and validation purposes, two synthetic signals containing harmonic as well as interharmonic frequency components have been used. Relative rms reconstruction error is calculated to show the accuracy of the estimation. The results have also been compared with the fast Fourier transform based method.