Research Of Sediment Control Measures And Optimal Arrangement Of Pumped Storage Power Station Based On Simulation Of Water And Sediment

Pumped storage power peaking power plants in the power grid as frequency modulation,phase modulation,fill the valley,emergency reserve special effect and significant economic benefits,ecological environment benefits based on power plant construction from the last century,in 90 s entered a period of rapid development of Chinese water storage,and become an important part of China's electric power industry indispensable.Compared with the conventional hydropower station,the storage capacity of the pumped storage power station is relatively small,and the upper and lower reservoirs are pumped and discharged.Therefore,the construction of pumped storage power station on the river,in the planning and design phase of the project must be fully studied sediment.In this paper,the simulation and optimization of the sediment problem in the frequency domain of a pumped storage power station.First of all,aiming at the practical problems of a pumped storage power station for temporary Hydrometric Station less observed data of water and sediment,the adjacent shop Li Qing hydrological station and Baitugang hydrological stations as a reference for the design of water and sediment stations,three river basins belong to one area,the average annual rainfall erosion in the same area,equivalent based on the runoff conditions are similar,the analysis and design of reservoir flood frequency and year long series of runoff and sediment by hydrologic analogy.Secondly,the simulation characteristics of the flood process and power plant operation test of a pumped storage power station under the reservoir by using physical model.The test results show that under the combined action of the sediment transport tank and the sediment submerged weir,the main sediment transport is better controlled,but the bottom muddy water will be retrograde to the vicinity of the inlet and outlet.During the 20 year frequency flood period,the measured sediment concentration is between 0.25 ~1.1kg/m3,which is higher than that of the safe operation of the pumped storage power station.At the same time,due to a flood discharge tunnel into the flow is not smooth,the discharge power shortage problems,resulting in Lassa and flushing effect is not very good.According to the physical model test in question,proposed the creation of non closed sediment submerged dike heightening and optimization scheme of submerged sediment control dam and flood discharge tunnel to change the inlet position and size optimization plan to expand imports,changes in the original design of the cofferdam location two,and based on MIKE21 FM software,the simulation of water and sediment the value of the original design and optimization scheme for different operating conditions.The simulation results show that,compared with the original design scheme,the optimization scheme has no obvious effect on reducing the total amount of sediment deposition in the reservoir area,but significantlyreduces the sediment thickness before the inlet and outlet of the power station.In the two optimization scheme of power station operation,sediment volume decreased 35 thousand and630 m3,sediment delivery ratio increased by 22.52%;in the power generation operation conditions,sediment volume decreased by 20 thousand and 60 m3,the ratio increased by12.77%,greatly reduced the amount of sediment deposition in reservoir area,while the power station at the inlet and outlet before sediment thickness,the reduction of optimization scheme is consistent.