The Application Research Of ADRC Control In Electromagnetic Bearing System

Flywheel energy storage technology is a technology which is achieved by high-speed rotation of the flywheel to transform the electric power to the mechanical energy.Because of the high energy storage density requirements,the corresponding rotor requires higher support performance.Electromagnetic bearings become one of the key technologies of the flywheel energy storage system research due to its special working principle,and the active controllable support force and many other advantages.At present,there are many researches on the electromagnetic bearing at home and abroad,but the control theory which is applied to the actual project is mainly focused on the research of the PID controller.However,with the improvement of the technical requirements,the PID controller gradually reflects its shortcomings.In this paper,the 10 kWh flywheel energy storage system prototype is treated as the research object,the PID control effect and the lack of immunity are analyzed from the experimental and simulation,for the lack of immunity,the anti-interference control technology is proposed and applied to the electromagnetic Bearing system.Firstly,the mathematical model of single degree of freedom and 5 degree of freedom is established by analyzing the structure and working principle of E-type magnetic bearing of 10 kWh system.In addition,the PID control system is used as the research object,its control effect is analyzed from the experimental results and simulation,the control effect shows shortcomings mainly in the anti-interference ability.Combined with the experimental process and the results and the structure,the interference sources in the system is analyzed.Secondly,because of the shortcomings of PID controlling the anti-interference ability,the auto-disturbance rejection controller is proposed and designed.The analysis of the auto-disturbance-rejection control system is achieved by MATALB in detail.The influence of each adjustable parameter on the control effect of the system is also analyzed.A double closed-loop auto disturbance rejection control(ADRC)system is designed and verified by simulation based on the change of the mathematical model caused by the rise of the coil temperature.Finally,the filtering ability of the tracker in the auto-disturbance rejection controller is analyzed by comparing with the filtering ability of the commonly used filter.Because of the ability of anti-disturbance rejection control technology to disturb and decouple.The decoupling control scheme of 5-DOF magnetic bearing-rotor ADRC is designed.