SOCRATES: A system for scheduling hydroelectric generation under uncertainty

SOCRATES: A system for scheduling hydroelectric generation under uncertainty

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Article ID: iaor1996171
Country: Switzerland
Volume: 59
Issue: 1
Start Page Number: 99
End Page Number: 133
Publication Date: Sep 1995
Journal: Annals of Operations Research
Authors: , , ,
Keywords: scheduling
Abstract:

The Pacific Gas and Electric Company, the largest investor-owned utility in the United States, obtains a significant fraction of its electric energy and capacity from hydrogeneration. Although hydro provides valuable flexibility, it is subject to usage limits and must be carefully scheduled. In addition, the amount of energy available from hydro varies widely from year to year, depending on precipitation and streamflows. Optimal scheduling of hydrogeneration, in coordination with other energy sources, is a stochastic problem of practical significance to PG&E. SOCRATES is a system for the optimal scheduling of PG&E’s various energy sources over a one- to two-year horizon. This paper concentrates on the component of SOCRATES that schedules hydro. The core is a stochastic optimization model, solved using Benders decomposition. Additional components are streamflow forecasting models and a database containing hydrological information. The stochastic hydro scheduling module of SOCRATES is undergoing testing in the user’s environment, and the authors expect PG&E hydrologists and hydro schedulers to place progressively more reliance upon it.

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