Dynamic Dispatch Of Hydro Generating Units

This work is concerned with the dynamic dispatch of hydro generating units. A performance criterion that takes into account variations in tailrace elevation, penstock head losses and turbine-generator efficiencies is considered. A heuristic procedure based oh Lagrangian Relaxation is applied to solve the dynamic dispatch problem of scheduling generation on an hourly basis during a day. The approach has been tested on a hydro system composed of nine hydro plants of the Brazilan power system. The generation scheduling verified on a typical day was considered for comparison with the solution provided by the approach and the results show a significant improvement in terms of hydro generation efficiency. © 2003 IEEE.2928933Nilsson, O., Sjelvgren, D., Variable splitting to modelling of start-up costs in short term hydro generation scheduling 1996 IEEE/PES Summer Meeting, pp. 498-506. , Denver, USA, 96 SMNilsson, O., Soder, L., Sjelvgren, D., Interger modeling of spinning reserve in short term scheduling of hydro systems (1998) IEEE Transaction on Power Systems, 13 (3), pp. 959-964. , AugustGuan, X., Svoboda, A., Li, C., Scheduling hydro power systems with restricted operating zones and discharge ramping constraints (1997) IEEE Transaction on Power- Systems, 14 (1), pp. 126-131. , februaryRux, L.M., An incremental economic dispatch method for cascade hydroelectric powerplants 1992 IEEE/PES Summer Meeting, 96 SM, p. 414Ponrajah, R.A., Galiaha, F.D., Systems to optimise conversion efficiencies at ontario hydro's hydroelectric-plants (1998) IEEE Transactionon Power Systems, 13 (3), pp. 1044-1050. , AugustNilsson, O., Sjelvgren, D., Hydro unit start-up costs and their impact on the short term scheduling strategies of swedish power producers (1997) IEEE Transaction on Power Systems, 12 (1), pp. 38-44Bjorkvoll, T., Bakken, B.H., Calculating the start-up costs of hydrppower generators (2002) 14th PSCC, , June, Sevilla, SpainArce, A., Ohishi, T., Soares, S., Optimal dispatch of generating units of the itaipu hydroelectric plant (2002) IEEE Transactions on Power Systems, 17, pp. 154-157. , FebruarySoares, S., Salmazo, C., Minimum loss predispatch model for hydroelectric power systems (1997) IEEE Transactions on Power Systems, 12 (3), pp. 1220-1228. , AugustLuenberger, D.G., (1984) Introduction To- Linear and Non-Linear Programming, , Second Edition, Addison-Wesley, Reading, Mas