Comparison of asynchronous sampling correction algorithms for power quality measurements under realistic conditions

The measurement of many signal parameters using digital sampling relies on synchronisation between the sampling clock and the signal under analysis. Deviations in the frequency of the measured signal from that expected can lead to significant measurement errors. Many techniques for overcoming these problems have been developed. Appraisals of the performance of these algorithms usually involve relatively benign steady state signals. This paper describes the testing of four representative algorithms for accurately recovering frequency and harmonic amplitude and phase information from realistic mains-borne waveforms.