Performance analysis of flickermeter in the presence of interharmonic componentsUntil the beginning of the first decade of this century it was believed that the appearance of the phenomenon of voltage fluctuation, and eventually flicker, was necessarily related to the abrupt changes, repetitive or random, in reactive power required by some loads like, for example, electric arc furnaces and hot strip mills. Concomitantly, the IEC flickermeter protocol was developed in this specific context. In this sense, the present paper shows some simulation results, as well as results obtained in the laboratory, showing problems in the quantification of voltage fluctuations by the IEC flickermeter, when interharmonic voltages are superimposed on the fundamental frequency.
KEYWORDS: Flickermeter, interharmonics.
RESUMOAté o início da primeira década do século XXI acreditava-se que o aparecimento do fenômeno da flutuação de tensão, e eventualmente da cintilação luminosa (flicker), estava necessariamente relacionado com a variação abrupta, repetitiva ou aleatória, da potência reativa requerida por algumas cargas elétricas específicas como, por exemplo, os fornos elétricos a arco e os laminadores de tiras. E foi exatamente nesse contexto que o protocolo da IEC para quantificação dos níveis de severidade de flicker foi desenvolvido. Nesse sentido, o presente trabalho mostrará alguns resultados de simulações computacionais, assim como resultados obtidos em laborató-rio, evidenciando problemas na quantificação das flutuações de tensão através do flickermeter IEC, quando da sobreposição de tensões com frequências inter-harmônicas ao sinal de tensão fundamental.
PALAVRAS-CHAVE:Flickermeter, inter-harmônicas.
This paper presents harmonic distortion measurements in several countries taken during live televised matches of the 2010 Soccer World Cup held in South Africa. The paper provides an analysis of the components involved in the increase of total harmonic distortion of current and voltage. The work also compares the latest measurements with previous events and makes some considerations regarding future trends. Measurements from Brazil, Italy, Netherlands and Australia are presented and briefly discussed. Lessons learned from these observations could potentially improve our understanding of the impact of customer equipment and customer behavior on harmonic levels and assist in managing waveform distortion now and in the future.Index Terms-harmonic distortions, soccer world cup.
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