THE PUBLISHING HOUSE PROCEEDINGS OF THE ROMANIAN ACADEMY, Series A, OF THE ROMANIAN ACADEMY Volume 9, Number 3/2008, pp.000-000 EXERGY AND ECONOMIC OPTIMIZATION OF COMPLEX POWER SUPPLY SYSTEMS

We describe a method of the optimization of a power supply system with regard for the interrelations between energy sources and sinks. An energy supply system represents an assemblage of dissimilar elements with a complex scheme of technological connections [1, 2]. The processes of the transformation, transfer, and redistribution of different kinds of energy, accompanied by changes in the parameters of state and flow rates of working media, take place in this system. The combination energy sources- energy sinks is an integral part of an energy system. For energy supply systems, the problem of optimal choice of the complex mentioned above is quite substantial. The optimization problem becomes especially important in those cases where there are several different energy sources, including, e.g., renewable energy sources, and several energy sinks of different power. As shown in [3, 4], the problems of this class can be solved with the use of a graph of exergy and economic expenditures for the pairwise interaction of flows. Let us concretize the concept of a graph of exergy and economic expenditures as applied to energy supply systems (ESS). In this case, we can consider the heat source as a heating (hot) flow and the heat consumer as a heated (cold) flow. We shall interpret a graph of the exergy and economic expenditures of an ESS, having an arbitrar