Journal ArticleDOI
Power and current components measurement in three-phase systems under nonsinusoidal conditions
TLDR
In this paper, a method based on an application of the Park transformation was proposed for measuring power and current components in three-phase systems under nonsinusoidal, asymmetrical and unbalanced conditions.About:
This article is published in Measurement.The article was published on 1994-01-01. It has received 11 citations till now. The article focuses on the topics: Wattmeter.read more
Citations
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Proceedings ArticleDOI
A digital method for the identification of the source of distortion in electric power systems
TL;DR: In this paper, the authors illustrate a method based on the evaluation of the sign of the harmonic active powers that can identify the source of distortion in three-phase systems, and an instrument is also described based on digital signal processing techniques, specially realized to perform such a frequencydomain analysis in real-time and to indicate whether the current distortion is caused by load nonlinearity or by nonsinusoidal supply voltages.
Journal ArticleDOI
Current decomposition in asymmetrical, unbalanced three-phase systems under nonsinusoidal conditions
TL;DR: In this paper, the Park transformation is applied to the harmonic and sequence components of the frequency-domain current decomposition proposed by Czarnecki in a more straightforward way and an extension of this decomposition to the case of asymmetrical supply voltages is considered.
Journal ArticleDOI
Development of adapted ammeter for fraud detection in low-voltage installations
H.O. Henriques,Andrés Pablo López Barbero,Ricardo M. Ribeiro,Marcio Zamboti Fortes,W. Zanco,Odair Xavier,R.M. Amorim +6 more
TL;DR: In this article, the authors describe the development and implementation of a modified ammeter to facilitate fraud detection in lowvoltage consumer units, which has three modules: a meter affixed to the top of a stick, which is the local unit and it measures the consumer current; another instrument that transmits the measured current after the customer's meter via radio frequency, and it is the remote unit; and the third is a receiver unit that displays the measurements made by the local and remote units.
Journal ArticleDOI
Power measurement in the non-coherent sampling
TL;DR: In this paper, an algorithm to improve the estimation of the active power of electrical systems in the non-coherent sampling is proposed, which is based on smoothing the sampled data by windowing, and then averaging of the discrete Fourier transform (DFT) coefficients in the frequency domain to reduce the leakage effects.
Journal ArticleDOI
Active Power Measurements - An Overview and a Comparison of DSP Algorithms by Noncoherent Sampling
Milos Sedlacek,Zdenek Stoudek +1 more
TL;DR: An overview of algorithms for o ne-phase active power estimation using digit al signal processing in the time domain and in the frequency domain, and compares the properties of these algori thms for a sinusoidal test signal is presented.
References
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Journal ArticleDOI
Orthogonal decomposition of the currents in a 3-phase nonlinear asymmetrical circuit with a nonsinusoidal voltage source
TL;DR: The concept of orthogonal decomposition of the current in a nonlinear single-phase circuit, with a sinusoidal voltage source, into active, scattered, reactive, and generated components is extended to three-phase asymmetrical circuits in this article.
Journal ArticleDOI
A new approach to the definition of power components in three-phase systems under nonsinusoidal conditions
Abstract: A method has been proposed for the definition of active and nonactive power components in three-phase systems under nonsinusoidal conditions. The method is more attractive than others since it is not a mere extension of methods employed in single-phase systems, but comes from the application of a quite powerful and synthetic mathematical tool specifically studied for the representation of three-wire three-phase systems in any possible condition: the Park transformation and the Park vectors. It is proven that the application of this method leads to the definition of two quantities, the real and the imaginary power, that are measurable in a quite simpler way than those proposed by other theories. The two satisfy all properties typical of the electrical power and are directly related, under sinusoidal and balanced conditions, to the active and reactive powers. It is shown how this method fits with other proposed methods that can be regarded in terms of this more general theory. >
Journal ArticleDOI
Considerations on the Reactive Power in Nonsinusoidal Situations
TL;DR: In this paper, the strong and weak points of the time-domain and frequency-domain approaches to the energy transmission investigations in nonsinusoidal systems were discussed, and it was shown that despite a more complex instrumentation, the frequency domain approach provides a theoretical basis not only for a conspicuous physical elucidation of energy transmission decreased efficiency, but also for power factor improvement in situations where the time domain approach proves ineffective.
Journal ArticleDOI
Reactive and unbalanced currents compensation in three-phase asymmetrical circuits under nonsinusoidal conditions
TL;DR: In this article, it was shown that the three-phase linear asymmetrical load supplied from a symmetrical source of nonsinusoidal voltage composed of a finite number of harmonics can be converted with a reactance circuit into a symmetric threephase circuit of almost unity power factor.
Journal ArticleDOI
A low-cost frequency multiplier for synchronous sampling of periodic signals
TL;DR: The authors present a low-cost device, based on a frequency multiplier, that allows the generation of sampling pulses synchronized with the signal frequency, and the results of the Fourier analysis of a multifrequency signal are given, showing the high accuracy that can be attained.