Design Of Hydraulic Turbine Power Generation System And Optimization Of PID Parameters

Pump as turbine(PAT)for energy recovery is one of the earlier research and development technologies in the field of pressure energy recovery.The study of the layout method of the PAT during the process of energy recovery has also been studied for many years at home and abroad.Considering the liquidity and controllability of energy,the PAT power generation system is undoubtedly the best choice among the three layout methods given in API610.With the development of society,the quality of power is also more demanding.The rated frequency of power system in China is 50 Hz.The allowable deviation of frequency is as follows: the installed capacity of the grid is more than 3 million k W,±0.2Hz,and the installed capacity of the grid is below 3 million k W,±0.5Hz.In order to solve the problem of unstable operation of pump as turbine power generation system and improve the quality of power generation,this paper takes the operation characteristics and layout mode of pump as the research object.The mathematical modeling and numerical simulation of hydraulic turbine power generation system are completed by combining theoretical deduction and numerical test,and the operating rules of the system are found.The system determines the optimal control parameters of the system,and also provides technical support for the application of the system,shortening the adjustment time and saving the running cost.The main contents of this paper are divided into the following three parts:(1)Design and mathematical modeling of hydraulic turbine power generation systemA set of controllable hydraulic turbine power generation system is designed by studying the characteristics and layout of hydraulic turbine.Through the study of the components of each module of the system,the mathematical model of the system is derived,and three mathematical models of hydraulic turbine for numerical simulation are put forward,and the analytical nonlinear model of the internal characteristics of the hydraulic turbine is derived,which provides a theoretical basis for further research of the system.(2)Simulation model and no-load test of hydraulic turbine power generation systemThe numerical simulation model of the system is established by using MATLAB software,and the influence of PID parameters on the system is preliminarily discussed.In the no-load test,with the increase of the ratio coefficient,the response time of the system becomes shorter and the overshoot increases.With the increase of the integral coefficient,the adjustment time of the system becomes longer,the overshoot increases and the oscillation process becomes longer.With the increase of the differential coefficient,the response of the system to the excitation is quicker and the overshoot amount is increased.(3)Optimization of system PID control parameters based on orthogonal testBased on the numerical simulation model of the established hydraulic turbine power generation system,the optimal system PID control parameters are determined by setting the orthogonal test values of the parameters of the PID.The experimental results show that when the permanent transition coefficient is 0.02,the transient difference coefficient is 0.45,the number of buffer time system is 7,the acceleration time coefficient is 0.3,the response curve of the system has no overshoot,no oscillation,quick response and short adjustment time,which is in line with the application requirements.