Abstract
The number of Distributed Energy Resources (DER) and dynamic loads is increasing rapidly in modern power systems. Their aggregated effects on power grid dynamics are, however, still insufficiently explored. It is expected that distribution-transmission interactions will be more pronounced in the future, resulting in a stronger need to analyse such effects. One of the emerging issues in modern systems’ distribution-transmission interactions is short-term voltage stability (STVS), which at present receives relatively low attention among the researchers. This paper utilizes advanced load and DER models in a large-system study, intending to determine the relationship between various distribution system specifics and the bulk power system STVS. Based on a developed heuristic method that generates a big data set by performing an extensive number of simulations, it is shown how the dynamic load and DER interact with each other in terms of STVS, and what load and DER amounts and types are beneficial or detrimental to modern systems. The study improves the understanding of modern distribution-transmission interactions related to STVS and emphasizes the importance of more accurate future modelling and analyses.
Highlights
One of the key strategies in addressing climate change is the shift to more sustainable sources of energy
We witness renewable energy sources (RES) emerging in the ma jority of modern grids. While some sources such as large solar or wind farms are usually connected directly to the transmission system, a vast amount of renewable energy production is scattered on medium and low voltage networks. This results in a rapid energy increase generated from distributed energy resources (DER) [1,2], which is accompanied by the effects on the system dynamics that are often no longer negligible [3,4,5,6,7,8,9]
The first is the influence of the dynamic load models on short-term voltage stability (STVS) without any Distributed Energy Resources (DER) penetration in the grid
Summary
One of the key strategies in addressing climate change is the shift to more sustainable sources of energy. Some recent studies address separately dynamic load [18,19], DER [20,21], and LVRT influence on STVS [22,23,24], but comprehensive research on the mutual interactions and combined effects on bulk power system STVS is still missing. The research in this area is insufficiently mature, possibly due to a large complexity and many variables.
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