Download e-book for kindle: Advances in Computer and Information Sciences and by Tarek Sobh

By Tarek Sobh

ISBN-10: 1402087403

ISBN-13: 9781402087400

Advances in laptop and knowledge Sciences and Engineering incorporates a set of carefully reviewed world-class manuscripts addressing and detailing cutting-edge study initiatives within the components of laptop technology, software program Engineering, machine Engineering, and structures Engineering and Sciences. Advances in desktop and knowledge Sciences and Engineering contains chosen papers from the convention lawsuits of the foreign convention on structures, Computing Sciences and software program Engineering (SCSS 2007) which used to be a part of the foreign Joint meetings on computing device, details and platforms Sciences and Engineering (CISSE 2007).

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Sampled power signal p(n) : a) first and third quarter parts; b) second and forth quarter parts. FREQUENCY INSENSITIVE DIGITAL SAMPLER AND ITS APPLICATION 25 Ts = T / N . (16) So in accordance with (13) the remainder number in the UDC to the end of the second period of the input signal becomes equal to the RP of the investigated circuit. The display indicates the binary output of UDC. 9). DS produces sampling signals with the frequency correlated with the input signal frequency. 9) produces the pulses with the cycling period proportional to the period T of the input voltage signal u (t ) .

The agreement between the calculating results and the simulation circuit outputs reveals: in contrast to the known existing methods for RP evaluation the proposed method does not require a phase shift of π / 2 between the voltage and current signals. The phase shift operation requires the corresponding hardwire[3] which may result in the additional measurement error. TABLE I SIMULATION RESULTS OF THE RP MEASUREMENT ALGORITHMS Outputs of the Percentage Results of simulation circuit error calculating ϕ, D P,W Q,VAR P,W Q,VAR δ, % 0 4,000 0,000 4,002 -0,0127 100 5 3,985 -0,348 3,987 -0,3613 3,558 15 3,864 -1,035 3,866 -1,047 1,169 25 3,626 -1,690 3,627 -1,702 0,724 35 3,277 -2,293 3,278 -2,305 0,508 45 2,830 -2,827 2,83 -2,837 0,342 55 2,296 -3,275 2,296 -3,284 0,259 65 1,693 -3,624 1,693 -3,629 0,131 75 1,038 -3,863 1,036 -3,867 0,103 85 0,352 -3,985 0,3469 -3,986 0,037 90 0,003 -4,000 0,0008 -4,0000 0,000 The requirement of IEEE/IEC definition of a phase shift of π / 2 between the voltage and the current signals, typical for reactive power measurement in sinusoidal conditions, is eliminated from signal processing operation.

In [7] the digital infinite impulse response filters are used to measure the reactive power. Although proposed algorithm allows to evaluate the harmonic components of the RP, the suggested method is still complex because the performing of the filtering procedures. A new application of the least error squares estimation algorithm for identifying the reactive power from available samples of voltage and current waveforms in the time domain for sinusoidal and non sinusoidal signals is proposed in [8].

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Advances in Computer and Information Sciences and Engineering by Tarek Sobh


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