Resumo

GARCIA M., Pável Julián; RODRIGUEZ E., Lucien A.; ROJAS, Herbert E.  e  RIOS, Carlos Alberto. Using the critical impedance method for determining the dominant harmonic source in medium voltage circuits. Ing. Investig. [online]. 2007, vol.27, n.1, pp.138-148. ISSN 0120-5609.

Automating industrial processes has led to the distortion of current and voltage waveforms, causing harmonic contamination in distribution networks. This paper shows the application of a practical methodology which determines the dominant harmonic source at the point of common coupling (PCC) between the network operator (NO) and the client. This is known as the critical impedance (CI) method, requiring monitoring voltage, current and phase angle signals for each existing harmonic component and NO and client Thevenin impedance values seen in PCC. The method needs approximate impedance information to operate and a simple and structured mathematical analysis based on studying the measurements projecting a useful, reliable and practical solution for detecting the dominant harmonic source in distribution systems.

Palavras-chave : harmonic pollution; critical impedance; harmonics; reactive power; point of common coupling; total harmonic distortion.

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