Journal Volume 16 Issue 2

Physical Interpretation of the Reactive Power in Terms of CPC Power Theory Revisited

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Dimitri Jeltsema, Jacob van der Woude

Recently the authors have developed a time-domain representation of the Currents’ Physical Components (CPC) power theory. Consequently, piece-wise continuous currents and voltages, such as square waves and sawtooth signals, can naturally be taken into account without approximating them by a finite number of harmonics. Based on the time-domain CPC approach, this paper refines and corrects some of the assertions made by Czarnecki in his paper ‘Physical Interpretation of the Reactive Power in Terms of CPC Power Theory’.

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Last Updated on Monday, 04 August 2014 13:51

Comments on “Physical Interpretation of the Reactive Power in Terms of CPC Power Theory Revisited”

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Leszek S. Czarnecki, Paul M. Haley

The paper evaluates the possibility of formulating the Currents’ Physical Component (CPC) – based power theory in the time-domain. It was concluded that the currents’ physical components, defined originally in the frequency-domain, can be calculated in the time-domain, but there is still the lack of their physical interpretation in that domain.

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Last Updated on Monday, 04 August 2014 13:51

Corona Modeling for the Transient Analysis, Steady State and Corona Loss Performance of Transmission Lines

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Mohamed M. Saied

This paper addresses the steady state analysis and the electromagnetic transients of overhead power transmission lines exhibiting corona. After a brief survey of the currently available modeling techniques, an alternative approach to the simulation of the corona discharge is presented. It is based on adding voltage-dependent current sources at prespecified nodes within the line’s lumped, ladder-shaped, equivalent circuit including an aduqate number of sections. The characteristics of these current sources can be determined using the usually available corona power loss measurements under power frequency sinusoidal voltage conditions. The line model is used for finding its transient response using time domain techniques. Several voltage excitation waveforms and magnitudes as well as different line’s loading conditions are investigated. As a further application of the suggested approach, the minimizion of the total corona losses of a long shunt compensated line will be considered as an additional criterion in the process of identifying the appropriate rating and location of the compensating coil primarily used for improving the line’s voltage profile.

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Last Updated on Monday, 04 August 2014 13:51

Economical Optimization of Capacitor Placement for Large-Scale Practical Distorted Distribution Network

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Tamer M. Khalil Selim, Alexander V. Gorpinich

This paper presents the optimization of large-scale practical distorted distribution network for maximum losses reduction and voltage profile improvement based on two-stage methodology for capacitor placement problem. In the first stage, a fuzzy expert system (FES) is used to find the optimal capacitor locations, and in the second stage, a selective particle swarm optimization (SPSO) is used to find the optimal capacitor sizing. The problem is posed as an optimization problem with objective to minimize the total cost of power and energy losses and capacitor banks including constraints for bus voltage and total harmonic distortion (THD) limits. Simulation results show the benefits from optimization and the effect of harmonics on optimal capacitor placement.

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Last Updated on Monday, 04 August 2014 13:52