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Model based resilience assessment and threats mitigation: a sensitivity based approach

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#Rete elettrica #Sicurezza

pubblicazioni - Memoria

Model based resilience assessment and threats mitigation: a sensitivity based approach

L’articolo presenta una metodologia dettagliata per la valutazione della resilienza del sistema elettrico che consente, nell’ambito della pianificazione dell’esercizio, di prevedere le contingenze più rischiose che possono colpire il sistema elettrico e, in modalità “studi di rete”, di analizzare scenari “what if”, valutando la risposta del sistema in base a diverse assunzioni circa l’intensità della minaccia e la vulnerabilità dei componenti, includendo anche i modelli di due misure di mitigazione contro le nevicate umide, ovvero i rivestimenti icefobici dei conduttori di linea e il ridispacciamento preventivo della potenza attiva dei generatori convenzionali per assicurare la minima corrente di anti-icing.

Extreme weather events can determine large load disruptions on power systems; this calls for the analysis of the vulnerabilities to natural threats which may cause multiple, dependent contingencies. Given the high social and economic costs of such disruptions, the Transmission System Operators (TSOs) are interested in predicting these potential critical scenarios and in applying suitable preventive and/or corrective countermeasures to increase system resilience. The paper presents an in-depth resilience assessment methodology suitable, in operational planning mode, to predict the most risky contingencies which will affect the power system and, in the engineering mode, to analyse “what if” scenarios, by evaluating the system response under different assumptions for threat intensity and component vulnerability.

The paper also provides a framework for operational and hardening countermeasures which can boost system resilience. In particular, the wet snow storm is the threat under study, and two mitigation measures are accounted for: the ice-phobic coatings of line conductors and the preventive redispatching of conventional generators to assure the minimum anti-icing currents. The sensitivity analyses carried out for different threat intensities on a model of the Italian EHV grid can help identify adequate mitigation measures.

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Tag correlate

#Rete elettrica #Sicurezza

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