The objective of the project is to devise a qualitative and quantitative framework to measure the impacts of converter-interfaced variable renewable energy resources in distribution grids, especially when the large-scale conventional generation connected at the transmission level is de-activated during times of high penetration of distributed generation. Specifically, the project aims to (i) identify the required modelling (RMS, EMT or post-fault steady-state analysis) for sufficiently accurate representation of converter-interfaced sources and new electrified demand for protection studies in MV/LV grids, (ii) assess the fault levels (i.e. short-circuit current levels) in a given MV/LV grid for selected given scenarios of penetration of VRE (variable renewable energy) sources during grid faults, (iii) quantify the impacts of different fault levels for selected scenarios, and (iv) elaborate on potential mitigation measures with close collaboration with protection experts at EKZ. Parts of the EKZ grid will be used for testing and evaluating the framework.
