Abstract
For interconnected power systems, simulations mainly rely on aggregated models, which summarise multiple decentralised converter-based generators within a grid to reduce the modelling and simulation effort. In contrast, this study investigates the frequency support of a medium-voltage benchmark grid with three individual decentralised converter-based generators following a load step in the high-voltage grid. Two control concepts – the grid-following and the grid-forming direct voltage control – are applied. The impact of the point of common coupling (PCC) of the generators is evaluated, referred to as the spatial distribution. The results show that the direct voltage control applied in the medium-voltage grid has a positive impact on the rate of change of frequency (RoCoF) of the high-voltage grid at all PCC evaluated and that the impact increases with increasing number of direct voltage controlled generators or the rated power of the generator. The choice of the PCC of the converter-based generator has a small influence on the frequency results. The maximum frequency deviation from the rated frequency, i.e. the frequency nadir following the load step, does not change significantly depending on the control concept.
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