Powers and Power Factor in Non-Sinusoidal and Non-Symmetrical Regimes in Three-Phase Systems

Petre-Marian Nicolae, Ileana-Diana Nicolae and Marian-Ştefan Nicolae
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Petre-Marian Nicolae: Faculty of Electrical Engineering, University of Craiova (UCV), 200440 Craiova, Romania
Ileana-Diana Nicolae: Faculty of Automatics, Computer Science and Electronics, University of Craiova (UCV), 200440 Craiova, Romania
Marian-Ştefan Nicolae: Faculty of Electrical Engineering, University of Craiova (UCV), 200440 Craiova, Romania

Energies, 2022, vol. 15, issue 14, 1-45

Abstract: The paper presents several theories related to definitions of powers and power factors in non-sinusoidal and non-symmetrical regimes. The theories must meet some requirements: (a) to facilitate the measuring of power quantities by using acquired electrical waveforms; (b) to support the correct quantification of powers and power factors for a fair charge; (c) to support solutions for efficient compensation of non-sinusoidal and non-symmetrical regimes, simultaneous with the power factor compensation along the fundamental harmonic. Only theories meeting the above-mentioned requirements are approached. Aspects specific to power definitions are discussed and commented. Three theories rely on the Fourier decomposition of non-sinusoidal waveforms, valid only for steady signals, whilst the fourth relies on the Discrete Wavelet Transform (DWT) and can also be applied to unsteady signals. Dedicated original data acquisition systems were used to acquire experimental data for three case studies. Data were analysed with original software tools, based on the Fast Fourier Transform and Discrete Wavelet Transform, implementing the approached theories. Comparisons between results yielded for analogue quantities proved that the approached theories satisfy the requirements for which they were created, except for the fourth theory, which can be used only for compensation purposes.

Keywords: powers theories; power factor; active; reactive; distorting; apparent and non-active powers; dedicated data acquisition systems; Fast Fourier Transform; Discrete Wavelet Transform (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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