This paper investigates the effect of modelling of different aspects of renewable energy sources (RES) namely wind farms (WF) and photovoltaics (PV) plants as a first step towards development of the equivalent harmonic model of RES plant for harmonic propagation and mitigation studies in large transmission networks. The paper proposes a set of scaling factors that can be used when modelling the whole RES plant as a single harmonic source, considering different weather conditions, configurations, and harmonic cancellation effects of RES plants. The results facilitate the assessment of global contribution of power electronics connected RES to harmonic levels in transmission networks and more generally harmonic propagation studies in large power electronics reach transmission networks.
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Zhao et al. (2018) studied this question.