DocumentCode :
981220
Title :
On some misinterpretations of the instantaneous reactive power p-q theory
Author :
Czarnecki, Leszek S.
Author_Institution :
Electr. & Comput. Eng. Dept., Louisiana State Univ., Baton Rouge, LA, USA
Volume :
19
Issue :
3
fYear :
2004
fDate :
5/1/2004 12:00:00 AM
Firstpage :
828
Lastpage :
836
Abstract :
The main features of the instantaneous reactive power (IRP) p-q theory, considered as a power theory of three-phase systems, are analyzed in this paper using the theory of the currents´ physical components (CPC). This analysis shows that the p and q powers are not associated with separate power phenomena, but with multiple phenomena. Moreover, the results of the IRP p-q theory contradict some common interpretations of power phenomena in three-phase circuits. Namely, according to the IRP p-q Theory the instantaneous reactive current can occur even if a load has zero reactive power, Q. Similarly, the instantaneous active current can occur even if a load has zero active power, P. Moreover, these two currents in circuits with a sinusoidal supply voltage can be nonsinusoidal even if there is no source of current distortion in the load. The analysis shows that a pair of values of instantaneous active and reactive p and q powers does not enable us to draw any conclusion with respect to the power properties of three-phase unbalanced loads even in a sinusoidal situation. Thus, the instantaneous reactive power p-q theory does not identify power properties of such loads instantaneously. This conclusion may have an importance for control algorithms of active power filters. The paper reveals the relationship between the p and q powers and the active, reactive and unbalanced powers, P, Q, and D and specifies the required energy storage capability of active power filters operated under sinusoidal unbalanced conditions.
Keywords :
active filters; power filters; power systems; reactive power; active power filter; current physical component; energy storage; instantaneous active current; instantaneous active power; instantaneous reactive current; instantaneous reactive power; p-q theory; sinusoidal supply voltage; three-phase systems; unbalanced power; Active filters; Circuits; Control systems; Energy storage; Filtering theory; Helium; Power filters; Reactive power; Reactive power control; Voltage; Active current; CPC; active power filters; apparent power; currents' physical components; instantaneous active power; instantaneous reactive power; power theory; reactive current; switching compensators; unbalanced power; unbalanced systems;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2004.826500
Filename :
1296759
Link To Document :
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