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Digital Processing of Synchronously Sampled AC Signals in the Presence of Interharmonics and Subharmonics

This paper deals with the problem of estimating the value of the active power of the ac signal in the presence of subharmonics and interharmonics. The method can also be analogously applied to determine the root-mean-square (rms) value of the basic electric values. The analysis makes use of the most general model of the voltage and current signal, i.e., the most complex spectral content that can be expected to appear in practice. A simulation of the suggested procedure has been done as well, as a final confirmation of the possibility of having accurate processing by using the synchronized sampling technique, even in the presence of subharmonics and interharmonics.