Research On Variable Speed Drive System Of Switched Reluctance Motor With High Speed And Large Inertia Load

The flywheel energy storage system relies on high-speed and large inertia rotor flywheels to achieve inertial energy storage.It has the advantages of high energy density,high reliability,long life cycle,and other important applications in the fields of aerospace,military defense,and other fields.The motor drive system is the core part of the flywheel energy storage system.It is mainly used to complete the rapid energy storage and variable speed drive of the high-speed and large-rotor rotor flywheel.The performance of the motor drive system affects the practicability,high efficiency and reliability of the energy storage system.The flywheel energy storage system studied in this project is different from the general energy storage system.It requires high energy storage(?18 MJ)and operates in pulse mode(repetitive output of 20 Hz).These put forward new challenge for the drive motor and its control system.The characteristics of its high energy storage require a high rotational speed and large inertia of the energy storage flywheel,which makes it difficult to quickly adjust the drive system;and the pulse output mode causes the energy storage flywheel to rotate frequently and rapidly,which requires the drive system to have strong resistance to impact.Compared with other electric drive systems,the switched reluctance motor drive system has the advantages of simple structure,wide operating range,multiple control parameters,and reliable drive circuit,and can meet the special requirements of the flywheel energy storage system of this project.Based on this,this dissertation focuses on the 18 MJ pulsed energy storage system and studies the variable speed drive system for high-speed large-inertia flywheel reluctance motors to realize the fast driving of large-inertia flywheels and complete the expected energy storage within 6 minutes.First,the theoretical study of the switched reluctance motor drive system is carried out.Secondly,the simulation analysis of the switched reluctance motor drive system is carried out,and the rated speed and power rating of the motor are optimally designed;the current chopping value,opening angle,turn-off angle,and the influence of voltage on the motor performance in the steady state are explained.The control parameters were optimized to determine the optimal control parameters of the drive system;a dynamic simulation model of the switched reluctance motor drive system was established to verify the rationality of the control parameters,and the current chopping,angle control and chopping angle combination were realized.Based on the analysis and research of various control methods,a comprehensive control strategy based on constant angle chopping(CCC1),variable angle chopping(CCC2)and angle control(APC)was proposed.At the same time,the hardware design of the switched reluctance motor controller based on "DSP + CPLD" was carried out,and the software was designed based on the double-closed-loop control strategy of current inner loop and outer loop of speed.Finally,based on the proposed control strategy,an experimental study of the switched reluctance motor drive system was conducted.Experiments show that the energy storage system can drive the flywheel to 10500r/min in 5 minutes,completing 18 MJ inertial energy storage,to meet the project for high speed Large Inertia Load Requirements for Quick Start and Variable Speed Drives.