Abstract
Despite the fact that residential distributed energy resources (DERs) are connected to low voltage (LV) networks, the analysis of large areas (thousands of houses) is typically done considering only the medium voltage (MV) part. Due to the lack of LV network data, most studies simplify them as lumped loads. While this is a reasonable assumption in the absence of data, it ignores the radial and unbalanced nature of LV networks; potentially under or overestimating the effects of DER. To understand the drawbacks of such simplified approaches, this study investigates the role of integrated MV–LV network modelling in adequately capturing solar PV effects. A methodology is proposed to realistically model three-phase, radial, unbalanced pseudo-LV networks based on network design principles. Using a real Australian MV feeder supplying 4600+ houses, results show that simplified approaches significantly underestimate the impact of high penetration of solar PV in distribution networks compared to the integrated MV–LV network modelling.
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