Numerical Simulation Of Hydraulic Transient Process Of Francis Turbine Generator Based On Flowmaster

In the face of the increasingly serious energy crisis and environmental protection problems,as a kind of clean and renewable energy,people pay more and more attention to the development and utilization of hydropower.The hydropower station is a very important link in the production process of hydropower.In order to ensure the safe and stable operation of the hydropower station,the calculation of the hydraulic transition process must be carried out.At present,the theory of calculation and analysis of transition process has been relatively mature,and in practical application,many scholars and enterprises at home and abroad have developed corresponding calculation programs or software.however,these programs or software have more or less some shortcomings in some aspects of the calculation of hydraulic transition process of hydropower station,such as complex operation interface,certain requirements for users,imperfect functions and so on.And with the development of construction technology,these calculation software may not be able to solve some new engineering problems completely,For example in order to discharge the ecological flow,there are two or more different tailwater outlets.Therefore,based on the theoretical analysis of transition process,the author uses the secondary development function of one-dimensional fluid simulation software Flowmaster to carry out the following research work:(1)the basic principles and methods of hydraulic transition process calculation are discussed,and the mathematical model of hydrogenerator set is established,which complements and perfects the complete relationship of,obtained from the comprehensive characteristic curve of hydraulic turbinemodel.The two curves are stored in the database of Flowmaster in the form of three-dimensional surfaces.(2)The mathematical model of hydrogenerator set is linearized according to the Flowmaster calculation rules,and the corresponding analysis element model of hydrogenerator set is created in Flowmaster,and the corresponding features are added to the analysis element model according to the parameters required by the linearization equation.(3)The corresponding control interface is added according to the calculation requirements of the hydrogenerator analysis element model,and then the communication module of the hydrogenerator component is generated in Flowmaster,and the communication module is imported into the Visual Studio 2013 platform to select C # language for detailed compilation.Finally,the hydrogenerator analysis element for Flowmaster is obtained.(4)According to the construction drawings of a hydropower station,a hydropower station model with multiple downstream reservoirs is established by using the existingcomponents in Flowmaster and the analysis components of the self-defined developed water turbine generator set,and the steady state analysis and transient analysis of the load rejection transition process of the hydropower station are carried out.Through the steady-state calculation and analysis,the relevant parameters of the turbine are obtained,and the correctness of using the secondary development function of Flowmaster to model the turbine generator set is proved.In the transient calculation,the load rejection numerical simulation of 70 MW generating unit and 10 MW ecological unit under six different working conditions is carried out.The numerical simulation results under each working condition are in line with the control conditions of the power station,which verifies the feasibility of using the secondary development function of Flowmaster to calculate the load rejection process of the hydropower station.