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Rapidly increasing share of distributed generation (DG) in distribution networks introduced the need for active distribution network operation. As current distribution networks were not designed to integrate the power generation, the DG introduced many technical challenges in sense of power quality, network planning, protection schemes, voltage stability…. This paper presents the advantages of active approach in distribution network operation. The paper focuses on a voltage quality problem and introduces the coordinated voltage control technique to increase the share of DG in distribution networks and at the same time supply the customers with the required voltage quality.

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Two methods for determination of harmonic emission levels at the point of evaluation are discussed in this paper. A method based on harmonic voltage and current phasor measurements is compared with the method based on long duration measurements of harmonic current and voltage magnitudes. One-week measurements were carried out to estimate customer harmonic emission levels using the two methods, and results were compared. Both methods produced comparable results and enabled the assessment of harmonic emission levels without switching maneuvers or disturbing the operation of any customer load. However, the method based on harmonic current magnitude measurements shows certain advantages as it does not require harmonic phase angle information. Both methods require the network harmonic impedance information, although reference impedances can be used to estimate the harmonic emission levels.Index Terms--Harmonic emission level, harmonic phasor, harmonic magnitude, reference impedances.