Increasing DER Hosting Capacity in LV Grids in the Czech Republic in Terms of European Project InterFlex

The paper explains benefits of autonomous control functions Q (V) and P (V) implemented in smart PV inverters for increasing DER hosting capacity in LV grids. The functions are implemented and tested by CEZ Distribuce, the largest Distribution System Operator (DSO) in the Czech Republic, in terms of Horizon 2020 InterFlex project. A simple methodology is verified and used to quantify the control functions impact on DER hosting capacity. Further measurement data from real installations are used to prove previous theoretical calculations and to check that power quality limits are not exceeded. Thus a highly positive benefit of autonomous control functions for DER hosting capacity is verified.