Power System Frequency Estimation Method in the Presence of Harmonics

A frequency estimation method with good resistance to harmonics is proposed in this paper. In the proposed method, a new sequence is constructed using the summation of the samples in the original sampling sequence. The amplitude ratio of the new sequence and the original sequence is used to calculate the fundamental frequency deviation. The effects of negative fundamental component, harmonics, and interharmonics are studied. A preprocessing procedure is also proposed to eliminate the effects of the interharmonics with frequency near the fundamental frequency. Theoretical analysis and simulations validate that the proposed method has good immunity to harmonics. Due to its low required processing effort and high precision, this method is a good candidate for online frequency estimation in the presence of harmonics.

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