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Comments to the paper: Instantaneous p-q Theory for Compensating Nonsinusoidal Systems

Czarnecki L.

Przegląd Elektrotechniczny

2009

R. 85, nr 6

167-169

The paper shows that the physical interpretation of the instantaneous reactive power q presented by E.H. Watanabe, H. Akagi and M Aredes in the paper "Instantaneous p-q Theory for Compensating Nonsinusoidal Systems", published in Przegląd Elektrotechniczny, R. 84, Nr. 6/2008, is erroneous. Alleged "exchange" energy between phases of supply lines of a three-phase system is not possible. Also it is not possible for energy to rotate around such a line. The paper shows as well that the Instantaneous p-q Theory, in the presence of the supply voltage harmonics or asymmetry, does not provide fundamentals for switching compensator control.

Artykuł pokazuje, że inerpretacja fizyczna chwilowej mocy biernej q, przedstawiona w arykule "Instantaneous p-q Theory for Compensating Nonsinusoidal Systems", opublikowanym przez E.H. Watanabe, H. Akagi oraz M Aredes'a w Przeglądzie Elektrotechnicznym, R. 84, Nr. 6/2008, jest błędna. Domniemana w tym artykule "wymiana energii" między fazami układu trójfazowego nie jest możliwa, podobnie jak nie jest możliwe wirowanie energii wokól linii zasilającej. Artykuł ten pokazuje także, że Instantaneous p-q Theory nie tworzy popranych podstaw kompensacji przy niesinusoidalnym napięciu zasilania odbiorników trójfazowych.

Power properties of three-phase electric circuits and their misinterpretations by the instantaneous reactive Power p-q Theory

Czarnecki S.

Przegląd Elektrotechniczny

2003

R. 79, nr 10

658-663

Description of power properties of three-phase circuits with sinusoidal voltages and currents in terms of various powers is the subject of the paper. Although one could expect that this description has been well established in electrical engineering for decades, the paper demonstrates that commonly used power equation could describe these properties erroneously. The study reported in this paper was focused on the Instantaneous Reactive Power p-q (IRP p-q) Theory, commonly used as a theoretical fundamental for control algorithms of switching compensators. Recently this Theory becomes an approach to identification and analysis of power properties of three-phase systems under nonsinusoidal conditions. The main features of the IRP p-q Theory are analyzed in this paper using the Theory of the Current's Physical Components (CPC), developed by the author of the paper. The paper demonstrates that results obtained from the IRP p-q Theory violate common interpretations of power phenomena in three-phase unbalanced systems with sinusoidal voltages and currents. Namely, it suggests the presence of a reactive current in supply lines of purely resistive loads, as well as, it suggests the presence of an active current in supply lines of purely reactive loads. Although all currents in such a situation are sinusoidal, the instantaneous active and reactive currents defined in the IRP p-q Theory are nonsinusoidal. Moreover, in spite of such suggestions, the Instantaneous Reactive Power p-q Theory is not capable of identifying power properties of three-phase loads instantaneously. A pair of values of instantaneous powers p and q does not allow us even to conclude whether the load is purely resistive, reactive, balanced or unbalanced.