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Active power measurements - an overview and comparison of DSP algorithms by noncoherent sampling

Sedlacek M., Stoudek Z.

Metrology and Measurement Systems

2011

Vol. 18, nr 2

173-184

This paper presents an overview of algorithms for one-phase active power estimation using digital signal processing in the time domain and in the frequency domain, and compares the properties of these algorithms for a sinusoidal test signal. The comparison involves not only algorithms that have already been published, but also a new algorithm. Additional information concerning some known algorithms is also included. We present the results of computer simulations in MATLAB and measurement results gained by means of computer plug-in boards, both multiplexed and using simultaneous signal sampling. The use of new cosine windows with a recently published iterative algorithm is also included, and the influence of additive noise in the test signal is evaluated.

Digital measurement of phase difference - a comparative study of DSP algorithms

Sedlacek M., Krumpholc M.

Metrology and Measurement Systems

2005

Vol. 12, nr 4

427-448

The paper compares nine methods of measurement of the phase difference of digitized sinusoidal signals mainly according to their sensitivity to sampling non-integer number of signal periods. The investigated methods can be classified into four groups - modifications of classical zero-crossing based measurements, virtual vector voltmeter, DFT-based measurements, and modifications of sine-wave fit algorithm. Results of both simulations and measurements are presented.

W artykule porównano 10 metod pomiaru przesunięcia fazowego pod względem ich wrażliwości na niecałkowitą liczbę próbek w okresie sygnału. Rozpatrywane metody zostały podzielone na 4 grupy - zmodyfikowane metody oparte na detekcji przejścia przez zero, pomiary bazujące na DFT, metody wirtualnego woltomierza wektorowego i zmodyfikowane algorytmy dopasowania przebiegów sinusoidalnych. Przedstawiono wyniki symulacji i pomiarów.