| Since the dual carbon targets of "carbon peak" and "carbon neutrality" were proposed,my country has successively issued a number of policies for carbon emissions.Among the policies related to the power industry,the 14th Five-Year Plan has clearly pointed out the need to build a new power system with new energy as the main source.However,power generation with new energy sources such as wind power and photovoltaics is affected by natural factors,and has the characteristics of "uncontrollable power generation".In particular,wind power generation also has randomness and volatility,and photovoltaic power generation is intermittent and sudden.These characteristics will It affects the stability of the entire power grid.In view of the insufficient capacity of the grid to absorb new energy,the introduction of energy storage technology is a good choice.Among the many forms of energy storage,the flywheel energy storage system stands out for its advantages such as high energy storage density,high power density,deep charging and discharging,and fast charging and discharging.The energy storage flywheel system is a rotating device that realizes the conversion of electrical energy and rotational kinetic energy.In order to increase the energy storage,it is generally to increase the speed and moment of inertia of the flywheel rotor,which also causes the vibration problem of the flywheel rotor to become more prominent.This paper takes the heavy-duty flywheel rotor as the object,and conducts the research on the modeling and vibration control of the magnetic levitation energy storage flywheel rotor.The main research content and research results of this article are as follows:(1)Aiming at the modeling problem of thick roulette flywheel rotor,this paper regards the thick roulette as a rigid structure and the rotating shaft as a flexible shaft based on the research of the previous scholars,and proposes a method based on the finite element method and the model conversion matrix.Modeling method of thick roulette flywheel rotor.This method is used to model the flywheel rotor in this paper,and analyze the natural frequency,critical speed,Campbell diagram,and harmonic response.Through finite element simulation comparison,it is verified that the modeling method proposed in this paper has high accuracy in low-order modal analysis.(2)Aiming at the axial permanent magnetic bearing used in this paper,using the corresponding permanent magnet theory,deduce the radial component stiffness of the axial permanent magnetic bearing.The magnetic tension stiffness of the motor is also calculated,and the influence of the two interference forces,the axial permanent magnet bearing and the magnetic tension of the motor,on the radial vibration of the flywheel rotor is discussed.Through simulation calculation,it is found that the radial stiffness of the axial permanent magnetic bearing and the magnetic tension stifness of the motor will affect the critical speed value and the critical resonance peak value of the flywheel rotor.(3)In response to the excessive vibration of the flywheel rotor,in order to increase the speed of the energy storage flywheel rotor and reduce the vibration,the radial support mechanical bearing was replaced with an electromagnetic bearing,and the flywheel rotor was designed with a radial electromagnetic bearing structure and a PID control system.,A model of an energy storage flywheel rotor supported by a radial magnetic bearing is constructed,and the dynamic characteristics of the flywheel rotor under different control parameters are discussed.(4)Aiming at the problem that the traditional adaptive notch filter unbalance control will change the stability of the electromagnetic bearing rotor system,an improved adaptive notch filter unbalance control strategy is proposed.The simulation results show that this method will not change the original stability of the electromagnetic bearing rotor system,and can also achieve the goal of reducing the rotor vibration by unbalance control. |
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