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This paper proposes an accurate and computationally efficient time-domain implementation of the IEEE Standard 1459-2010 for power measurements. The most important parts are adaptive low- and bandpass finite-impulse-response (FIR) filters that extract dc and fundamental components, respectively. In addition, coefficient sensitivity problems of the large-order FIR comb cascade structure are overridden by using a multirate (decimation) digital signal processing technique. Even more, by using decimation antialiasing filters, the parameter estimation accuracy is improved. The symmetrical components are estimated through adaptive transformation matrix of phase shifters. The algorithm convergence provided a fast response and adaptability. The effectiveness of the proposed technique is demonstrated by simulation results. The algorithm shows a very high level of robustness and high measurement accuracy over a wide range of frequency changes.