Simulation Analysis Of Dynamic Characteristics And Energy Consumption Of Submersible Pump System Based On Modelica

As a typical multi-domain complex system in the unloading system of the petrochemical industry,the submersible pump system involves many fields such as hydraulics,machinery,and control.The design of this system must fully consider the coupling relationship between multiple domains.The dynamic characteristics of the submersible pump system directly reflect the stability and safety of the working process.Using multi-domain system modeling and simulation methods to analyze and optimize the submersible pump system is particularly important for improving the dynamic characteristics of the system.In addition,the performance index of the submersible pump system during use is often higher than the actual demand,and the long-term partial operating conditions cause unnecessary energy consumption.In view of the above problems,in order to ensure the safe and stable operation of the submersible pump system with high efficiency,this paper uses a multi-domain unified modeling technology based on Modelica to construct a submersible pump system model and simulate its dynamic characteristics and energy consumption characteristics Analysis and optimization.The main research work of the thesis is as follows:First,the working principle and composition of the submersible pump system are elaborated,the function,working principle and mathematical model of the key components of the submersible pump system are analyzed,and the simulation model of the key components based on the Modelica language is established,including the constant pressure variable pump,Models such as speed torque control valve(STC valve),remote control valve group,centrifugal pump,three-phase asynchronous motor,controller,etc.The model construction of the submersible pump system was completed and the model was verified.The results show that the established models can meet the design requirements.The system model has the characteristics of strong reusability,which lays a model foundation for the parameterized and componentized system design of the submersible pump system.Then,based on the submersible pump single pump system model,verify the mutual coupling of each system,and verify the accuracy of the system model by comparing with the single pump experimental data,and also analyze its step response characteristics and load changes on the system stability influences.The reason why the control pressure of the multipump system fluctuates under specific working conditions is analyzed.The study shows that the STC valve in the speed limit state is likely to cause the control pressure of the remote valve group to fluctuate.To this end,with the goal of reducing the fluctuation amplitude of the control pressure of the remote valve group,three dynamic characteristic optimization schemes including the optimization of the damping orifice parameters of the STC valve,the optimization of the spring stiffness parameters and the optimization of the control pressure of the remote valve group are proposed.The analysis results show that the optimization of related parameters can improve the phenomenon of remote control valve group control pressure fluctuations and achieve safe and stable operation of the submersible pump system.Finally,the energy-saving principle of the submersible pump system is analyzed,and the three system control strategy models of speed adjustment,valve opening adjustment and joint adjustment are established with the system energy consumption as the optimization goal,and the system energy consumption of the three adjustment schemes is compared and analyzed..The analysis results show that the joint adjustment scheme can effectively solve the problem of partial working conditions in the submersible pump system,improve the working point of the submersible pump system,reduce the system energy consumption,and provide an effective reference scheme for the energy-saving research of the submersible pump system.