Ten-day water regulation scheme considering lakes with storage capacity of Yangtze-to-Huaihe River Water Transfer Project
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Abstract:
The Yangtze-to-Huaihe River Water Transfer Project is a large-scale inter-basin water transfer project which combines a series of gate pump engineering entities and lakes with storage capacity. Water regulation is an important work to guide the operation of project scheduling, which can be divided into annual water regulation, monthly water regulation, and ten-day scale water regulation, according to the scheduling period and time scale. Ten-day scale water regulation determines the daily water transmission and supply process of the water transfer project in the next ten-day period and reduces the operation cost of the water transfer project while meeting the water supply demand. The ten-day scale water regulation is guided by the total ten-day water transfer determined by monthly water regulation, and at the same time provides total daily water transfer for the real-time operation of the pumping station project, which is the key link between water operation scheduling and real-time scheduling of water transfer project. In recent years, a large number of studies have reported the optimal scheduling calculation method of the cascade pumping station system in the water transfer project, but there are few studies on the joint scheduling of the water transfer project and the complex water conveyance system of gate pump lake mixing, especially the optimal scheduling considering the lake regulation-control process. Facing the actual engineering requirements of the Yangtze-to-Huaihe River Water Transfer Project, it is urgent to further study the influence of the lake regulation-control process on the optimal operation mode of cascade pumping stations based on existing research.A study on ten-day scale water volume regulation of inter-basin water transfer project considering the lake storage regulation process was carried out to exploit the potentialities of ensuring water supply and reducing the energy consumption of pumping stations through the regulation and control capacity of the lakes in the project. A multi-objective ten-day scale water volume optimal scheduling model of gate pump series considering lake regulation-control process was constructed, and the genetic algorithm was used to solve the model, to formulate a pumping station-lake joint scheduling scheme that meets the minimum water shortage of water-using units, the minimum energy consumption of pumping stations and the minimum imbalance of lakes in and out. The different typical operating conditions of the dispatching operation of the Yangtze-to-Huaihe River Transfer Project are analyzed, and the advantages of the ten-day scale water volume regulation scheme considering the lake regulation-control process are discussed by taking the free flow transfer condition.The results showed that compared with the scheduling scheme without considering the lake regulation-control process and by considering the lake regulation-control process can reduce the total water shortage rate by 1.2 % and the total energy consumption by 642 kW·h during the scheduling period. The inter-basin water transfer project considering the lake regulation-control process can effectively improve the water supply guarantee rate of the project and reduce the total water transmission energy consumption. The main function of the lake storage capacity is to track the change in water demand by the water storage capacity of the lake, to ensure that the cascade pumping stations are within the efficient operating range as far as possible from the change of water demand. The decision support can be provided for the operation scheduling of the Yangtze-to-Huaihe River Water Transfer Project.
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