Recursive total least-squares estimation of frequency in three-phase power systems. Arablouei, R., Dogançay, K., & Werner, S. In 2014 22nd European Signal Processing Conference (EUSIPCO), pages 2330-2334, Sep., 2014.
Recursive total least-squares estimation of frequency in three-phase power systems [pdf]Paper  abstract   bibtex   
We propose an adaptive algorithm for estimating the frequency of a three-phase power system from its noisy voltage readings. We consider a second-order autoregressive linear predictive model for the noiseless complex-valued αβ signal of the system to relate the system frequency to the phase voltages. We use this model and the noisy voltage data to calculate a total least-square (TLS) estimate of the system frequency by employing the inverse power method in a recursive manner. Simulation results show that the proposed algorithm, called recursive TLS (RTLS), outperforms the recursive least-squares (RLS) and the bias-compensated RLS (BCRLS) algorithms in estimating the frequency of both balanced and unbalanced three-phase power systems. Unlike BCRLS, RTLS does not require the prior knowledge of the noise variance.

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