Optimized Operation Of The Cascade Pumping Station System In The Hongze Lake To Luoma Lake Section Of The East Route Of The South-to-North Water Transfer Project

The east route of the South-to-North Water Transfer Project is a complex cascade pumping station system and the optimally operating modes of the pumping station system have not been achieved optimal operation.Those pumping stations consume a lot of energy during operation.Therefore,the optimal operation of cascade pumping stations has great potential of energy saving.In order to study the optimal operation of the cascade pumping station system,The composition of the cascade pumping station system and the energy loss of the system has been analyzed in this paper.And the information of the pumping station project of the Hongze Lake to the Luoma Lake section,which is a part of the South-to-North Water Transfer Project,has also been investigated and checked.Based on actual data,a mathematical model for optimal operation of the cascade pumping station sysytem is established.According to the characteristics of pump station optimization operation,the particle swarm optimization algorithm is improved.The improved hybrid particle swarm optimization algorithm is used to calculate the optimal operation scheme of the single-stage parallel pumping stations of Hongze Lake to Luoma Lake Section and the cascade pumping station system of Xuhong River single line water conveyance system and also the system of Xuhong River and Zhongyun Canal double-line water conveyance system.The research resuls are as follows:(1)According to the characteristics of the optimal operation model of the pumping station,the improved algorithm is integrated from the initial model of the particle swarm algorithm,the inertia weight and the global search ability of the algorithm to find a more suitable approach for solving the pump station optimization problem,which is named as Improved Hybrid Particle Swarm Optimization(IHPSO)by the author.Then IHPSO is used to solve the optimal operation scheme of the typical station system.The results show that the system energy consumption based on IHPSO algorithm is 7.68%lower than that of PSO algorithm.It turns out that he IHPSO algorithm is more suitable for solving pump station optimization problems.(2)Compared with the parallel pumping stations system of Siyang 1st pumping station and Siyang 2nd pumping station,in the case of a certain head,the minimum operating point of the system is the optimization target,and the fixed angle optimization operation scheme,the constant flow rate optimization operation scheme and the variable blade-angle with increased flow rate optimization operation scheme are calculated and analyzed.The results show that the two schemes can save 0.14%～3,18%and 14.62%～30,87%energy consumption respectively,compared with the fixed(designed)angle optimal operation scheme.When the flow rate is small,the optimization effect of increasing the variable blade angle operation scheme is more remarkable.(3)Double-layer optimization system is adopted to optimize the operation of single branch cascade pumping station system.The first layer optimizes the internal operation of the pumping station system,and the second layer optimizes the inter-stage head distribution,which makes the total energy consumption of the whole cascade system the lowest.The IHPSO algorithm is used to determine the optimal operation scheme of the cascade pumping station system of the Xuhong River branch line from Hongze Lake to Luoma Lake on the East Route of the South-to-North Water Transfer Project.The results show that when the water level of Hongze Lake is 12.5～13.5m,Luoma Lake is 20.5～23.5m,and the demand flow rate of Luoma Lake is 80～140m3s,the optimal allocation of inter-stage lift can reduce the operation energy consumption by3.20%～10.77%and improve the system efficiency by 1.35%～5.27%.(4)Three-layer optimization system is adopted to optimize the operation of two-branch cascade pump station system.That is to say,the optimal allocation of the flow between the two branch lines-the optimal allocation of the head between stages-the optimization of the internal operation of the pumping station system.The IHPSO algorithm is used to determine the optimal operation scheme of the double-line water transfer cascade pumping station system of Xuhong River and Zhongyun River from Hongze Lake to Luoma Lake on the Eastern Route of the South-to-North Water Transfer Project.The results show that when the water levels of Hongze Lake and Luoma Lake are 13.5m and 23.0m,and the demand flow rate is 250m s,when only the blade angle is optimized,the system energy consumption decreases by 5.20%5～.89%compared with that when the blade angle,flow rate and head are optimized,and the system energy consumption decreases by 8.68%～13.96%compared with that when the blade angle is not optimized.