Dynamic Analysis And Optimization Of Flywheel Energy Storage Rotor System

In recent years,my country’s wind power and photovoltaic power generation technologies have developed rapidly.With the gradual advancement of "carbon neutrality",new energy power generation will usher in a new stage of development.But at the same time,the large-scale integration of new energy power generation into the power grid has also brought many problems.The problems of large intermittent and poor controllability of wind power and photovoltaic power generation will bring unprecedented pressure to the peak shaving and absorption of the power grid.In order to stabilize the output of new energy power generation systems,flywheel energy storage technology is used as an important energy storage method to assist peak and frequency modulation.Flywheel energy storage technology has ushered in an important development opportunity.However,as a large-scale high-speed rotating mechanical system,the flywheel energy storage system has a higher limit speed and a wider working speed range,which puts forward higher requirements on the structural strength and dynamic characteristics of the flywheel rotor.This article uses rotor dynamics related theories and The research method,while making a dynamic analysis of the flywheel rotor-support system,uses a combination of genetic algorithm and finite element method to optimize the rotor structural parameters,in order to improve the dynamic characteristics of the flywheel rotor and understand the flywheel rotor-support The influence of various factors in the system on the dynamic characteristics of the rotor,the improvement of the design and manufacturing level of the flywheel energy storage rotor,and the operational safety and reliability provide theoretical support.The research content and results of this article are as follows:(1)For the rotor-support system of the large-capacity flywheel energy storage system,the finite element method is used for modeling and simulation,the natural frequency and the corresponding vibration shape are obtained,and the relationship between the critical speed and the working speed range is determined.(2)According to the sensitivity of the critical speed to the various parameters of the structure,the corresponding changes in the critical speed of each order when the structural bending stiffness,the length of the shaft section,and the mass change slightly are obtained.This is when the critical speed of the structure is adjusted later.How to quickly and effectively adjust the corresponding parameters laid the foundation.Then based on the sensitivity analysis,the second-order bending vibration frequency was successfully moved out of the working speed range.(3)On the basis of dynamic analysis of the initial structure of the rotor,the height,diameter and supporting stiffness of the two ends of the flywheel are changed respectively,and the natural frequencies of the flywheel rotor structure under different parameters are calculated,and different factors in the flywheel rotor system can be obtained.The impact on the critical speed provides theoretical support for subsequent structural optimization.(4)By adopting the optimization method combining genetic algorithm and finite element,the flywheel structure size is optimized.Through the verification of the optimization results,it not only meets the requirements of energy storage,but also successfully adjusts the first-order critical speed to the working speed.Out of scope.