PMSM四象限驱动系统的自适应滑模和反步控制

Four Quadrant PMSM Drive System Via Adaptive Sliding Mode Control and Backstepping

针对永磁同步电机(PMSM)四象限驱动系统直流母线电压存在超调、电机转速跟踪效果差等问题,研究了一种基于背靠背变流器的控制策略。分别搭建网侧变流器和PMSM数学模型,基于改进的滑模控制和反步法,电网侧采用软给定的方法设置母线电压给定值,用以解决电压超调,机侧针对负载转矩未知情形,设计了负载转矩观测器。仿真结果表明,该控制方案下系统的网侧母线电压无超调,机侧转速跟踪性能良好。

In order to solve the problems of DC bus voltage overshoot and poor tracking effect of motor speed in the four quadrant permanent magnet synchronous motor drive system,a control strategy based on the back-to-back converter was designed.The models of the grid-side and PMSM were established respectively,based on the improved sliding mode control and backstepping,the voltage soft setting mode was adopted to solve the voltage overshoot,a load torque observer was designed for the unknown load torque.Simulation results show that the system’s DC bus voltage on the grid-side has no overshoot,and the motor-side speed tracking effect is better.