Study On Control System Flywheel Energy Storage With Sensorless Detection Technology

In recent years, many domestic and foreign institutions and scholars study on distributed energy storage more and more, and as a more advanced mechanical energy storage mode, flywheel energy storage technology also come to the fore, it has many advantages,such as flywheel energy storage system with longer service life,easy to implement the control, high density, and extremely insensitive to temperature,or green energy. Flywheel energy storage system can not only as an energy storage device, but also can use the fast charge and discharge characteristics to regulate the electric energy quality, at the same time can also be used as a high power discharge power supply, so the flywheel energy storage technology is widely used in many fields of electric vehicles, aerospace and defense.Firstly, this dissertation introduces the basic principle of flywheel energy storage, and the flywheel energy storage system according to the requirements of flywheel energy storage carrier, eventually permanent magnet synchronous motor(PMSM) is used as drive motor. In the process of charging uses the vector control method and SVPWM modulation mode, in the discharge process of the system uses the three level Boost circuit and voltage closed-loop control mode, to make the system output stable and controllable voltage. This dissertation adopts sensorless technology based on the sliding mode variable structure to obtain the rotor position of the motor, and has carried on the further research and improvement.Secondly, the simulation model of the sliding mode observer is built by Matlab/Simulink simulation software, and the constant torque/constant power charging and three-level Boost constant voltage discharge simulation models of the system in the vector control mode are given, and the simulation results are analyzed,and results verify the feasibility of the control strategy.Finally, using TMS320F2812 of TI company as the core control chip, the hardware and software of the system are designed and the experimental platform offlywheel energy storage system has built, on this basis, doing the charging and discharging experiments, results verify the feasibility and correctness of vector control mode and three level Boost rectifier in the actual operation of the flywheel system.