Martinoli - Energoprojekt, Holding Corporation Belgrade , Yugoslavia

Middle-term generation planning of a hydro-thermal power system is an utterly complex problem , the solving of which implies taking into account specifies of the given power system. This paper presents the essential features of a probabilistic middle term generation planning model , developed to statisfy the specified requirements. Beside the standard topics, contained in similar models ( i.e. calculation of the expected values of unit loadings, production costs , fuel requirements, system reliability ) , the specifics encountered in this case study, like - The need to simulate stochastic aspect of hydro generation. - Planning of the operation of a pumped hydro unit with seasonal storage. - Determination of the necessary expansion of the analyzed period, etc,. are described .Based upon the discussed model , a computer package has been developed , the main characteristics of which are also presented.

Middle-term planning , simulation, water resources steam plants, pump-storage plants, reliability