Optimized Operation Strategy And Design Of Cascade Pumping Station System

In this paper,a series of researches have been carried out for the optimized operation method of the cascade pumping station project,and a reliable optimization model has been established.The cascade has been effectively improved through the application practice of the Tuanchenghu to Huairou reservoir water conveyance section of the Miyun Reservoir storage project.The operation control level of the pumping station water supply project provides an important reference for the safe,efficient and economic operation of the cascade pumping station.This paper mainly studies from the following aspects:(1)Study on the operating efficiency of the cascade pumping station.The entire cascade pumping station project is regarded as a system,which is divided into pumping station engineering and water conveying project.The two projects are pumping station subsystem and water conveying subsystem respectively,and the operating efficiency including pumping station subsystem and water conveying subsystem is obtained.The overall efficiency of the step pump station within.(2)Research on the efficiency optimization of the cascade pumping station system and the influencing factors of the efficiency of each subsystem.According to the corresponding expression and calculation formula of the pumping station operating efficiency,the influence of each index on the efficiency is analyzed.The performance of the pumping device related to the efficiency of the pumping station subsystem is analyzed and calculated based on the model experiment theory of the pumping station pumping device.The channel water loss related to system efficiency is based on the constant non-uniform flow theory of the open channel to establish a hydraulic loss model,and seeks the optimal operating plan for system operation efficiency.(3)Research on the optimal operation theory and model of the cascade pumping station.Starting from the pump station optimization theory,the core ideas of water level optimization and flow optimization and the relationship between them are studied.For the large-scale system of cascade pumping stations,based on the large-system decomposition coordination theory,a three-decision model for large-system optimal operation is proposed.It is the flow optimization of single-stage pumping station,the head optimization of the cascade pumping station and the daily optimal scheduling of the water delivery flow.(4)Implementation and comparison of optimized operation schemes for cascade pumping stations.Based on the above decision model,the dynamic programming method is used to solve the problem.The water diversion project of the first six cascade pumping stations in the Duanchenghu to Huairou reservoir section of Miyun Reservoir is taken as the research object,and combined with the actual operation of the project,the daily optimal dispatch of the cascade pumping station system is established.The three-layer optimization model gives a specific daily optimization scheme.The comparison scheme is divided into four parts:(1)no optimization(2)only flow optimization(3)only water level optimization(4)flow and water level optimization scheme,The comparative study of the above three programs has analyzed the possible influencing factors of daily operating costs,the impact of channel hydraulic loss on head distribution,the relationship between water transfer flow and daily operating cost,and given optimization suggestions for various influencing factors.,and the applicable conditions of each program.The results show that the optimized solution of the triple decision model significantly reduces the daily running cost,improves the operating efficiency of the cascade pumping station system,and saves the operating cost,which is obviously better than the first two schemes.It verifies the validity and practicality of the paper optimization model.