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The preventative strategies for $N-1$ network security dominant in Europeannetworks mean that network capacity is kept free in case a line fails. Ifinstead fast corrective actions are used to overcome network overloading whensingle lines fail, this has the potential to free up network capacity that isotherwise underused in preventive $N-1$ security strategies. In this paper, weinvestigate the impact on renewable integration of a corrective networksecurity strategy, whereby storage or other flexibility assets are used tocorrect overloading shortly after line outages. In this way, we findsignificant cost savings for the integration of renewable energy of up to 2.4billion euros per year in an aggregated 50-bus model of the German power systemutilizing these flexibility assets, so-called network boosters (NB). Thisoffers a role for storage beyond energy arbitrage or ancillary services likefrequency control. While previous literature has focused on the potentialsavings of NB in the short-term operation, we focus on the long-term benefitsin systems with high shares of renewable energy sources, where the capacitiesand dispatch of generation and NB are optimised. We demonstrate the benefits ofNB for various shares of renewable energy, NB and flexibility costs, as well asdifferent allowed levels of temporary overloading the lines in both (i) asequential model, where long-run generation investments are optimisedseparately from the NB capacities, and (ii) a simultaneous model, wheregeneration is co-optimised with NB investment so that mixedpreventive-corrective approaches are possible.

Long-Term Benefits of Network Boosters for Renewables Integration and Corrective Grid Security