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Short Term Hydrothermal Scheduling and Dispatch


In this research line Cepel develops methodologies and software programs for:
(i) Short-term hydrothermal operation planning –In the short-term operation planning, within a horizon of up to 12 months discretized in weekly and monthly stages, the individual generation targets of the hydro and thermal plants are determined, as well as the energy interchanges among subsystems, considering the expected cost of operation up to the end of the horizon, obtained in the medium-term planning. For this task the DECOMP model is officially used since 2002 by ONS in its monthly operation program (PMO) and by CCEE to determine the weekly spot prices (PLD), in several load blocks.
(ii) Security constrained operation scheduling and hourly pricing– In the daily operation scheduling, the main objective is to determine the dispatch of each generation unit, as well as the system marginal costs, with a time discretization of up to half an hour and a horizon of up to 2 week. Besides all the features already taken into account in the mid term planning, several additional aspects are included at this phase, such as: power reserve, DC model for the electrical network, with losses and additional security constraints; thermal unit commitment constraints, including the operation of combined cycle plants; river routing and operation of channels, among other features. For this task the DESSEM model is employed, integrated with the NEWAVE and DECOMP models, and is being validated by ONS and CCEE in order to establish hourly prices in Brazil, starting in January 2020.

(iii) Short-term load forecasting – An essential information to determine the hydrothermal dispatch is the load forecast. For this task the PREVCARGADESSEM model is employed for the daily operation scheduling, and the ISELF model is used for the real time dispatch. 





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