Simulation Analysis And Engineering Application Research Of Hydraulic Transient Of Hydropower Plant

With the increasing number of hyderpower and pumped storage power stations,the hydraulic transition increasingly prominent.This process not only affects the tone and assurance unit, surge chamber surge level, even for the hydropower development approach and the overall layout.When hydropower is operating, the frequent changes in load of turbine lead to the turbine guide vane opening and closing quickly affected many parameters such as water pressure in long diversion tunnel, water pressure in penstock, water level in the surge tank, unit speed parameter. At the same time, hydraulic transition process had a serious impact on the safe operation of the hydropower. Therefore, It is very necessary to study hydraulic transition process.Based on the previous researches, we have study on the digital simulation of hydraulic transition process. Compared to other engineering measures, optimization of Wicket Closure Rule is the preferred means to solve the problem of hydraulic transition process because it does not need to add other devices, quantities, and engineering investment.The basic theory and calculation method of hydraulic transition process have been introduced at first, the cause and content of the transition process have been investigated,also. Then, the effects of the wicket closure, optimize the rule of linear guide vanes and two-stage guide vanes etc. have been researched. The results of simulation experiments show that the optimization of wicket closure rule can get better outcomes. Through the simulation using hammer software, the water hammer changes of hydropower station under different guide vanes and the flow and head changes of the surge chamber are obtained. The simulation results show that the effect of different guide vanes on the transition process is different, and the surge chamber surge calculation is carried out also.