Technical Solutions for Increasing DER and EV Hosting Capacity in the Czech Republic in Terms of European Project InterFlex

The paper describes proposed, implemented, tested and verified technical solutions supporting distributed energy resources (DER) and electrical vehicles (EV) integration in the distribution grids. The solutions are implemented by CEZ Distribuce, the largest Distribution System Operator (DSO) in the Czech Republic, in terms of Horizon 2020 InterFlex project. New approaches for PV inverters control are introduced in a way that DER integration is less limited by voltage constraints or other grid issues. Different approaches for LV and MV grids are explained. Smart solutions including autonomous functions of PV inverters, remote control or energy storage are presented to show the future potential for successful DER grid integration. Further an idea how to control EV charging power is introduced to integrate EVs smoothly