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Improvement the resilience of the regional power system in Croatia

The paper describes the problem of the maintain to the security of a part of the Croatian power system in Istria due to the unexpected unavailability of generation prior to the maximum peak load in the summer 2017. Considered reduced power system security occurs due to unavailability of thermal power plant Plomin and statistically probable outages of the key high voltage line during the summer thunderstorms. Short-term and long-term measures necessary to improve the resilience of the regional power system in Istria are described. The main purpose of these countermeasures is to reduce the risk of black out and to decrease recovery time of the regional power system in Istria if black out occurrs. The cost benefit analysis shows the justification and cost-effectiveness of the countermeasures taken to improve the resilience of the affected part of the power system and points to the need to develop measures at the whole power system.