Abstract

This paper deals with an analytical model to evaluate the non-characteristic harmonics that are generated by three-phase three-wire voltage-source converters (VSCs) operating under unbalanced sinusoidal voltage condition. This model permits the calculation of the oscillating current on the VSC dc side considering the unbalanced voltages on its ac side. It can be used to prove that the use of dc voltage control techniques to eliminate VSC dc-side double frequency voltage ripple necessarily creates three-phase currents with undesirable low frequency harmonic components on the VSC ac side. In this work, the attention is directed to the instantaneous oscillating real power component at twice the line frequency, rather than to other power components. The non-characteristic current components analyzed in this work, such as the fundamental negative sequence and third-order harmonic components of positive and negative sequences, are calculated using the proposed model in time-domain simulations. A simple model to calculate the dc-side capacitor to mitigate these non-characteristic harmonic problems is presented.

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