Methodology for planning of distributed generation in weak grids

Distributed generation (DG) units are increasing in number all over the world, thus providing new opportunities, but also challenges for distribution system operators. This paper briefly describes the status for integration of DG in Norway, highlighting challenges that Norwegian distribution network companies are facing with regard to large scale integration of DG, typically small scale hydro. The paper further reports from a survey describing some aspects of DG integration and existing planning methodologies among distribution network companies. An overall methodology for planning of integration of DG is presented, highlighting different aspects of inherent uncertainty in the planning process. The methodology can be used by the distribution system operators to develop long term network plans taking into consideration the local potential for DG, but also the uncertainty (in terms of timing, location and capacity) for DG development.