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There are different MV grid concepts with regard to mode of operation andprotection system layout. The increasing installation of DG raises the questionif the currently used concepts are still optimal for future power systems. Wepresent a methodology that allows the automated calculation and comparison oftarget grids within different concepts. Specifically, we consider radial grids,closed ring grids and grids with switching stations. A target grid structure isoptimized for each of those grid concepts based on geographical information. Tomodel a realistic planning process, compliance with technical constraints fornormal operation, contingency behaviour and reliability figures are ensured inall grid concepts. We present a multiphase approach to solve the optimizationproblem based on an iterated local search meta-heuristic. We then economicallycompare the grids with regards to CAPEX and OPEX for primary and secondaryequipment, to analyse which concept leads to the most overall cost-efficienttarget grids. Since the methodology allows an automated evaluation of a largenumber of grids, it can be used to draw general conclusions about thecost-efficiency of specific concepts. The methodology is applied to 44 real MVgrids spanning about 4800km of lines, for which the results show that a radialgrid structure is overall cost efficient compared to grid topologies withswitching stations or closed rings even in grid areas with a large DGpenetration. The contribution of this paper is threefold: first, acomprehensive methodology to compile automated target grid plans underrealistic premises is presented. Second, the practical applicability of theapproach is demonstrated with a large scale case study with a high degree ofautomation. And third, the results of the case study allow to draw conclusionsabout the techno-economical differences of different MV grid concepts.

Analysing the Degree of Meshing in Medium Voltage Target Grids - An Automated Technical and Economical Impact Assessment