Critical evaluation of FBD, pq and CPT current decompositions for four-wire circuits
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Data
2009-12-01
Autores
Marafão, Fernando P. [UNESP]
Paredes, Helmo K. M.
Da Silva, Luiz C. P.
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Resumo
This paper investigates the major similarities and discrepancies of three important current decompositions proposed for the interpretation of unbalanced and/or non linear three-phase four-wire circuits. The considered approaches were the so-called FBD Theory, the pq-Theory and the CPT. Although the methods are based on different concepts, the results obtained under ideal conditions (sinusoidal and balanced signals) are very similar. The main differences appear in the presence of unbalanced and non linear load conditions. It will be demonstrated and discussed how the choice of the voltage referential and the return conductor impedance can influence in the resulting current components, as well as, the way of interpreting a power circuit with return conductor. Under linear unbalanced conditions, both FBD and pq-Theory suggest that the some current components contain a third-order harmonic. Besides, neither pq-Theory nor FBD method are able to provide accurate information for reactive current under unbalanced and distorted conditions, what seems to be done by means of the CPT. © 2009 IEEE.
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Palavras-chave
Current decomposition, FBD-theory, Harmonics, Homo-variables, Power theory, pq-theory, Unbalanced systems, Balanced signals, Critical evaluation, Current component, Four-wire, Non-linear, Nonlinear load, Power circuit, Reactive currents, Third-order, Three-phase four-wire, Unbalanced condition, Charge trapping, Electric current measurement, Electric wiring, Harmonic analysis, Power electronics, Wire, Decomposition
Como citar
2009 Brazilian Power Electronics Conference, COBEP2009, p. 49-57.