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Present day electric power systems in developed countries are characterised by very high reliability. In Germany the mean supply interruption time per year for the end customers is 23 minutes. How will this high quality of supply change with the increase of decentralised and renewable generation? Which measures are necessary to keep on this high reliability standard? This is one of the investigation goals in the E-Energy project Regenerative Modellregion Harz (RegModHarz). From a power system planning point of view it is possible to calculate some reliability indexes to evaluate the network structure. This methodology and some calculation examples will be given in part one of this paper. Further, taking into account the current experiences with power system operation, some necessary measures to support the secure power system operation with a high share of renewable generation, will be presented. The expected level of reliability in the future distribution power system will be analysed.

Renewable Generation and Reliability in the Electric Power Network Zuverlässigkeit elektrischer Netze mit Energieerzeugung aus erneuerbaren Energien