The paper analyses the reliability of power supply for a 330/750 kV electrical ring. Consideration is also given to the influence of emergency automatics on the maximum permissible power flows in different electrical connection points of the ring as well as to the application of reliability criterion (N-1) in the case of using the emergency automatics to limit post-accident power flows in these points. The authors discuss the role of operative and technological management in securing the power supply reliability. They also analyze situations with disconnection of major generation units and its influence on the blackout development.
Method of Power System Suistanable Development Optimization in Liberalized Market Conditions
The paper is focused on the development of the Baltic Sea region taking into account the new EU energy policy. The authors elucidate the current situation and the power system infrastructure projects of the region. For the economic analysis and optimization of the development plans a method is proposed that takes into account the outlooks for upcoming 20-50 years and the initial information uncertainty. The method makes possible estimation of the technically-economic state, including market conditions, for a given power system.
In order to assess sufficiency of Latvian power system, research simulation model has been created. It embraces Latvian, Estonian and Lithuanian systems and parts of Russian and Belorussian power systems. The software LDM-AD has been applied for analysis performance on reliability of transmission network substations and switchgear units, as well as technical and economic analysis of several dynamic development process options observing reliability economic indicators. The researches performed on planning methodology development indicated that system sufficiency estimation for 5 and 10 horizon is not capable to ensure sustainable development strategy. In order to ensure long-term development, entirely different planning methodology and other tools for analysis are required. The planning process shall be sustainable taking into consideration rather long prospective period from 30 to 50 years.
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