Policy framework conditions for provision of ancillary services in a distribution network by distributed RES generation

The aim of this paper is to give an overview of the technical and regulatory issues the DSOs are facing when operating the system with rising share of DRES. We follow up with and overview of the current status of the boundary conditions for the provision of ancillary services from DRES, in particular from PV generation in different EU countries and the relevant experiences with policy making. The key policy documents investigated include policy frameworks and grid codes, as they regulate the conditions for connection of DRES and their operation in distribution network. The surveyed industry landscape shows that while facing very similar technological issues of varying and volatile DRES generation output, the DSOs operate on quite different technical and regulatory conditions.