三相电流型整流器的线性自抗扰控制

Linear Active Disturbance Rejection Control of Three-phase Current Source Rectifier

针对传统电流型整流器采用双闭环比例积分控制器(PI)控制存在输出超调较大,系统抗干扰能力差,响应时间过长的问题,采用线性自抗扰控制策略,利用线性扩张状态观测器(LESO)对电流型整流器的扰动进行观测和补偿。通过对电流型整流器的数学模型以及线性自抗扰控制器(LADRC)结构原理进行分析,设计了电流型脉冲宽度调制(PWM)整流器的LADRC电流外环控制器及电流内环d轴和q轴控制器,通过仿真平台将PI控制和LADRC控制的控制效果进行了比较和验证。仿真结果表明:线性自抗扰控制相较于PI控制抗干扰能力更强,响应时间更短且没有超调。

Aiming at the problems of large output overshoot,poor anti-interference ability and long response time of the traditional current source rectifier controlled by double closed-loop proportional integral controller(PI),the linear auto disturbance rejection control strategy is adopted and the linear extended state observer(LESO)is used to observe and compensate the disturbance of the current source rectifier.By analyzing the mathematical model of current source rectifier and the structural principle of linear active disturbance rejection controller(LADRC),the LADRC current outer loop controller and current inner loop d-axis and q-axis controller of current source pulse width modulation(PWM)rectifier are designed.The control effects of PI control and LADRC control are compared and verified through the simulation platform.Finally,the simulation results show that compared with PI control,linear ADRC has stronger anti-interference ability,shorter response time and no overshoot.