Assessment Of Energy Availability In Hydro Systems Under Different Operational Policies

This paper is concerned with the assessment of energy availability in hydro systems under different operational policies. Optimization and simulation models representing the detail operating characteristics of hydro plants, including the consideration of the influence of forebay and tailrace elevation on hydro conversion efficiency were considered. The assessment of energy availability was based on the calculation of duration curves for hydro generation and the identification of firm energy, guaranteed energy, and secondary energy, as well as average and standard deviation values of energy availability. Various operational policies have been evaluated to determine their influence on the energy availability of the system. Twenty of the most important hydro plants from the Brazilian system were used in the numerical tests, with case studies performed to highlight the relation between energy availability and operational policies. The economic profiting of secondary energy was also addressed.Fortunato, L.A., Araripe, T.A., Ribeiro, J.C., Pereira, M.V.F., (1990) Indroduction to the Expansion Planning and Operation of Electric Power Systems - in Portuguese, , Universidade Federal Fluminense EDUFF, Niterói, BrazilMarques, T.C., Cicogna, M.A., Soares, S., Benefits of Coordination in the Operation of Cascaded Hydroelectric Power Systems (2004) Proceedings of the 4th IASTED - International Conference on Power and Energy Systems, , Rhodes, GreeceCicogna, M.A., Soares, S., Assessment of Secondary Energy in Hydroelectric Systems (2001) Proceedings of the 4th International Conference on Hydropower Development, pp. 55-60. , Bergen, Norway, junCarvalho, M., Soares, S., An Efficient Hydrothermal Scheduling Algorithm (1987) IEEE Transactions on Power System, PWRS-2, pp. 537-542Oliveira, G.G., Soares, S., A Second-Order Network Flow Algorithm for Hydrothermal Scheduling (1995) IEEE Transactions on Power Systems, 10 (NO3), pp. 1635-1641Soares, S., Carneiro, A., Optimal operation of reservoirs for electric generation (1991) IEEE Transactions on Power Delivery, 6 (NO3), pp. 1101-1107Rosental, R.A., A Nonlinear Network Flow Algorithm for Maximization of Benefits in a Hydroelectric Power System (1981) Operation Research, 29 (4), pp. 763-786Soares, S., Carneiro, A.A.F.M., Reservoir Operation Rules For Hydroelectric Power System Optmization (1993) Proceedings of the 1993 Athens Power Tech - IEEE/NTVA, 2, pp. 965-96