Digital methods for measuring asymmetry of three-phase voltage systems

Mints, M. Ya.; Chinkov, V. N.; Гриб, Олег Герасимович

doi:10.1007/bf00838760

Cited by 2 publications

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“…At the non-sinusoidal form of the three-phase voltage, the asymmetry is found in the fundamental harmonic. Correlative signal processing methods based on discrete Fourier transforms are allowed to distinguish the fundamental harmonic with minimal error and in real time [9][10].…”

Section: Resultsmentioning

confidence: 99%

“…We estimate the error of the correlation method of measuring the asymmetry of voltages of a three-phase network based on the preliminary transformation of a three-phase network into two-phase, with the subsequent decomposition of each phase into orthogonal components by means of a discrete Fourier transform [9][10][11]. In this method, the inverse sequence is described by an expression that allows us to calculate the quadrature components of the converted three-phase voltage into two-phase: .…”

Section: Resultsmentioning

confidence: 99%

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Determination of Measurement Error of Electrical Energy Quality Indicators by the Correlation Method

Filonenko¹,

Larin²,

Stakhova³

2022

Herald KhmNU.TS

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The problem of energy conservation is urgent not only for Ukraine but for the whole world. One of the main causes of non-productive energy costs in the energy sector is high losses in power grids. The problem of electricity quality is the focus of many researchers and practitioners of energy and electrification. The co-supply of single-phase and three-phase electrical energy receivers from a three-phase four-wire network is widespread in the power supply systems of industrial enterprises. In such cases, there is almost always a phase asymmetry of the load, as well as significant currents in the zero wire. These factors lead to a decrease in the quality of the voltage and are the cause of economic damage. Organization of hardware control of electricity quality indicators, organizational and economic mechanism of influence on the cause of deterioration of electricity quality, development of methods and technical methods of distortion are important for normalization of electricity quality. The error of the correlation method for measuring the unbalanced voltage of a three-phase network based on the preliminary conversion of a three-phase voltage to a two-phase voltage with subsequent decomposition into orthogonal components using a discrete Fourier transform is estimated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%