基于自抗扰和负载功率前馈的高速磁悬浮系统PWM整流器控制策略

Control Strategy for PWM Rectifier of High-Speed Maglev Based on Active Disturbance Rejection Control and Load Power Feed-Forward

高速磁悬浮列车采用长定子直线同步电机驱动,在运行过程中采用分段供电的方式,当磁悬浮列车从一个定子段过渡到另一个定子段时,列车一侧的定子会经历电流降为零再增大的换步过程。对于高速磁悬浮系统中三相PWM整流器而言,负载在换步过程中变化剧烈,对直流侧输出电压产生了严重的影响。为了抑制负载扰动对直流侧电压的影响,提出一种结合自抗扰和负载功率前馈的电压、电流双闭环控制策略。通过硬件在环实验验证了该策略对负载变化具有较强的鲁棒性,降低了定子段换步过程中的直流母线电压波动,提高了PWM整流器的抗负载扰动能力和系统动态性能。

The high-speed maglev train is driven by long stator linear synchronous motor,which is powered by segmented power supply.When the maglev train moves from one stator section to another,the stator current will decrease to zero and then increase.For the three-phase PWM rectifier in high-speed maglev system,the load changes sharply during the process of changeover,which has a serious impact on the DC voltage.In order to suppress the influence of load disturbance on the DC voltage,a double closed-loop control strategy based on active disturbance rejection control(ADRC)and load power feed-forward estimation algorithm is proposed in this paper.The hardware-in-the-loop(HIL)experiment verifies that this strategy has strong robustness to load variation,and it can suppress the DC voltage fluctuation,improve the anti-load disturbance ability and system dynamic performance of three-phase PWM rectifier.