A Influência da Referência de Tensão na Avaliação de Indicadores de Qualidade de Energia (The Influence of Voltage Referential in Power Quality Indices Evaluation)

Fernando Pinhabel Marafão (fmarafao@sorocaba.unesp.br)1, Sigmar Maurer Deckmann (sigmar@fee.unicamp.br)2, Helmo Kelis Morales Paredes (hmorales@dsce.fee.unicamp.br)2

1Universidade Estadual Paulista
2Universidade Estadual de Campinas

This paper appears in: Revista IEEE América Latina

Publication Date: March 2008
Volume: 6,   Issue: 1 
ISSN: 1548-0992

This paper discusses the importance of the voltage referential for power quality monitoring and power system’s instrumentation. Considering the operating conditions of simple power circuits, it will be demonstrated that an incorrect choice of the voltages referential may result in erroneous quantification of some power quality indices, especially in three-phase four wire circuits. The use of a virtual reference point and the neutral conductor as reference have been considered and the simulation results confirm the influence of the voltage reference selection in the evaluation of total harmonic distortion, unbalance factors and voltage sags. Finally a way of linking both methods will be discussed by means of Blakesley’s Theorem.

Index Terms:
Neutral point, non-linear loads, power measurement, power quality, virtual star point, voltage reference.   

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