Empirical Mode Decomposition Based Prony's Method for Fundamental and Harmonics Analysis of Power System

Prony”s Method is used for estimating fundamental frequency and harmonics. Empirical Mode Decomposition (EMD) is adopted for denoising the signal if the signal is noise affected as the Prony”s Method is very sensitive to noise. Piecewise adaptive Prony”s method analysis the modal components of a power signal more accurately than any other method and here Singular Value Decomposition has been used for that purpose as it is more consistent than least square method. EMD method breaks the noisy signal into several Intrinsic Mode Functions (IMFs). The IMFs containing the important information of the uncorrupted signal such as, frequencies and corresponding phases and amplitudes are used to reconstruct the signal so that the noisy components are discarded. Then the denoised signal is imported to the Prony”s Method for modal components extraction. DC components., fundamental frequency and harmonics., interharmonics, sub harmonics., frequency fluctuations., phase and amplitude of the signal can also be measured with accuracy.