Optimized Scheduling of Cascade Pumping Stations in Open-Channel Water Transfer Systems Based on Station Skipping

Abstract

Cascade pumping stations (CPSs) in open-channel water transfer systems usually consume vast amounts of energy and are expensive to operate. For these CPS systems, scheduling optimization is a critical approach to save energy. In this paper, an optimized scheduling method based on station skipping is proposed, in which the use of one or more pumping stations can be reduced and the allocation of the gross head to other stations is optimized. In this method, a one-dimensional hydrodynamic model and a complex optimization model were established. The Miyun Reservoir Regulation and Storage Project in Beijing was selected for a case study. The results indicate that (1) some stations with low heads could be skipped at low or medium discharges compared with the design discharge; and (2) the optimization scheme with skipping pumping stations has a more substantial energy-saving effect than that without skipping any stations under certain conditions. This proposed method makes it possible to save energy and reduce cost at low or medium required discharges in such CPS systems.