A hydraulic simulation-optimization model of the joint operation of multiple devices in long-distance water diversion systems under the pumps shutdown process using a parallel NSGA-II approach

The operation of a long-distance water diversion system in the transient process is a rather complicated problem requiring the joint operation of multiple devices. In this study, the joint operation of multiple hydraulic devices in the pumps shutdown process is expressed as a multi-objective optimiz...

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Bibliographic Details
Published in:Water science & technology. Water supply 2022-09, Vol.22 (9), p.7387-7404
Main Authors: Liu, Xiaolian, Tian, Yu, Zheng, Ying, Liu, Zirong, Wang, Hao
Format: Article
Language:English
Subjects:
Computer applications
Decision making
Design optimization
Devices
Distance
Efficiency
Finite volume method
Genetic algorithms
hydraulic simulation-optimization model
Hydraulic transients
Hydraulics
long-distance water diversion systems
multiple devices
Multiple objective analysis
Optimization models
parallel nsga-ii
Pareto optimization
Pipes
Pumps
Shutdowns
Simulation
Simulation models
transient operation
Valves
Water diversion
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Summary:The operation of a long-distance water diversion system in the transient process is a rather complicated problem requiring the joint operation of multiple devices. In this study, the joint operation of multiple hydraulic devices in the pumps shutdown process is expressed as a multi-objective optimization problem, and the hydraulic simulation-optimization model is proposed. The model is a bi-level framework, where the optimization model comprehensively considering various safety risks and efficiency through three objective functions is coupled with the MOC-based hydraulic transient simulation model. The parallel NSGA-II approach is proposed to solve the model. Besides, a process for effectively handling the constraints of the joint optimal operation of multiple hydraulic devices is proposed. Finally, the proposed model and approach are applied to a real long-distance water diversion project. The results show that the proposed model can find a set of feasible Pareto front solutions. The parallel approach greatly improves the computational efficiency. For the Pareto front schemes, the hydraulic devices are adjusted less frequently and the total regulation time is only 1/8.92–1/11.49 of that of the current operation scheme. Thus, this study provides an effective approach to formulate the joint operation scheme of multiple devices of long-distance water diversion systems.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2022.308