Abstract
An optimization model has been implemented for on-line control of water distribution systems. The control period may extend over several days. Control is exerted at hourly intervals. Discrete Dynamic Programming (DDP) is used as the optimization algorithm, an additional ARIMA module supplies hourly demand forecasts. Programming language is FORTRAN. The model determines minimal cost operating schedules based upon the most economical energy tarifs and optimal trade-offs between pumping and storage. An optional multiobjective approach includes the times of switching the high-lift pumps. The model was tested and verified for the city of Wolfsburg.
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