Advanced signal processing methods of harmonics and interharmonics estimation

The authors show that a high-resolution spectrum estimation method, such as min-norm could be effectively used for parameter estimation of distorted signals. The Prony method could also be applied for estimation of the frequencies of signal components. The accuracy of the estimation depends on the signal distortion, the sampling window and on number of samples taken into the estimation process. Unfortunately, the computational effort of the highresolution methods is significantly higher than FFT processing. The proposed methods were investigated under different conditions and found to be variable and efficient tools for detection of all higher harmonics existing in a signal. They also make it possible the estimation of interharmonics