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Analisi delle oscillazioni elettromeccaniche inter-area nell’ipotesi di integrazione tra i sistemi elettrici di trasmissione delle aree continentale europea “CE”, turca “TK” ed ex-sovietica “IPS/UPS”. Relativa influenza delle tecnologie FACTS e HVDC utilizzate per l’interconnessione.
The possible expansion of the Continental Europe “CE” synchronous system, nowadays including Turkey, toward the IPS/UPS system of Russian Confederation could provide multiple advantages in terms of operation security, integration of renewable energy as well as energy trading. The operation reliability of the whole merged system is one of the main topics analyzed in the ICOEUR project (Intelligent Coordination of Operation and Emergency Control of EU and Russian Power Grids) co-founded by the European Commission within the 7th Framework Program, and by Russia. In this context, a prototype tool for the assessment of possible inter-area electromechanical oscillations, by means of eigenvalues calculation, is developed and applied on a detailed dynamic model of the merged system, also considering the presence of the new available technologies for flexible energy transmission (FACTS and HVDC). Power oscillations could be critical (poorly damped or undamped) on weak/long distance systems and/or highly exploited systems. They could be triggered also by small disturbances like normal variations of load and/or generation and mainly consist of fluctuation of power flow on critical corridors with possible serious consequences like system separation in islanded areas, load shedding, up to possible black-out. These phenomena are emphasized in large interconnected power systems, in particular in case of high utilisation of critical corridors also due to market liberalisation. Oscillations could be hampered by means of i) decreasing of power flow on critical corridors (uneconomic, and against the market constraints), ii) strengthening of transmission system by new links (expensive), iii) equipment of suitable additional damping controls (PSS) on FACTS devices and HVDC links, in addition to conventional PSS on generators. This paper presents some considerations obtained applying the developed tool on the whole merged grid model. The effort has been to highlight the influence on the critical power oscillations of i) power flows on interconnection between the two systems, ii) interconnection solutions (AC or hybrid AC/DC, DC), iii) technologies for the AC system devices suitable to mitigate the consequences of grid bottlenecks on oscillations (like TCSC). The model representing the CE and Turkey system was provided by the two TSOs TERNA and TEİAŞ, while ESI supplied the IPS/UPS network model. These two separated network representations were upgraded to medium-long term and merged hypothesizing some new HVDC back-to-back links and/or closing some existing AC tie-lines presently out of operation or in service with a radial scheme from CE toward West Island of Ukraine. The considerations described in the paper represent a contribution for the assessment of the best technically interconnection solutions aimed to improve the damping of critical inter-area oscillations that could affect the whole system CE/Turkey plus IPS/UPS.
31 Dicembre 2010
Studi sullo sviluppo del Sistema Elettrico e della Rete Elettrica Nazionale (P01 GOV)