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The quantification of harmonic emission requires an accurate representation of the network harmonic impedances. A number of techniques have been proposed to make the assessment of the network harmonic impedances practical and less invasive. Using actual event data, captured at a solar farm, this paper aims to utilize existing assessment techniques to develop an online network harmonic impedances assessment model. The harmonic impedances can then be updated per event and automatically be corrected as the network develops. This technique is noninvasive and will provide an accurate estimation of the network impedances enabling the continuous assessment of power quality emissions

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In accordance with the IEC 61000-3-6, the evaluation of the harmonic emissions requires an accurate harmonic impedance representation of the system. However, the assessment of a harmonic impedance is understood to be a very complex problem and that the available methods are not entirely satisfactory. Yet, utilities and other network users are expected to prove compliance to apportioned emission limits. To enable the online assessment of harmonic emissions, this paper proposes the use of prevailing phasors to enable the monitoring of the network's harmonic impedance. The proposed method has been validated using network simulations and practical measurements at a windfarm were used for offline assessments.

No abstract