Emergency generators for supplying islanded MV networks

In order to increase network resilience, Distribution System Operators are evaluating different remedial actions against extreme events that lead to long interruptions. This paper evaluates the technical solutions for deploying an emergency generator (EG) supplying an islanded Medium Voltage (MV) network. The paper identifies the minimum technical requirements and different neutral grounding arrangements that can be adopted. Taking into account the maximum size of the mobile generators available in the market, evaluation results show that supplying a section of a distribution network could be done only if cable length is lower than 5 km and maximum load is less than 0.5 MW.