Research Of The SVPWM Vector Control System For Asynchronous Motors

This thesis comes from the engineering project "Simulation of power electronic circuits and research on coordinated control algorithm", which is entrusted by Yunnan Power Grid Electric Power Research Institute. It aims to use the TI’s DSP chip TMS320F2812 as the control center, establish a set of asynchronous motors AC speed regulation experimental platform. To meet requirements of control strategy and experiments for the engineering project.The main contents are as follows:First of all, determined the control scheme for the experimental platform. Researched the vector control principle based on rotor field-oriented. And the asynchronous motor voltage input model and the model of SVPWM vector control model had been established in the Matlab/Simulink and the a-P coordinate system environment. This thesis respectively carried on the no-load starting experiment, carry-load running experiment, load mutation experiment and dynamic speed-governing experiment, etc. The results showed that the system had fast dynamic response to rotation speed, small steady state error and strong ability of anti load disturbance, which verified the feasibility and effectiveness of the vector control for the asynchronous motor.Secondly, in order to improve the reliability of the experimental platform, researched asynchronous motor sensorless control strategy. Based on the previous research, designed the motor speed observer based on the extended Kalman filter (EKF). Used genetic algorithm (GA) to optimize the EKF covariance matrix and weight matrix and obtained the optimal parameters of the EKF speed observer. The simulation results showed that the EKF observer had good dynamic and static performance. The research of the EKF observer does help to the development of the more advanced AC speed regulation experimental platform.Finally, designed and produced the power driver board, built the hardware system of experimental platform. Written the software system by using the software development platform CCS3.3. Realized the SVPWM algorithm works on the experimental platform. And got six 5V PWM waves (PWM1-PWM6). Verified the effectiveness and practicality of the AC speed regulation experimental platform.