并联型有源电力滤波器的改进线性自抗扰控制

Improved Linear Active Disturbance Rejection Control of Shunt Active Power Filter

为了提高并联型有源电力滤波器对谐波电流的动态跟踪速度和抗扰动能力,本文从误差控制的基本原理出发,提出了一种改进型线性自抗扰控制器。该改进型线性自抗扰控制器通过引入新的误差作为线性扩张状态观测器中总扰动的调节依据,且在系统稳定的前提下,将该控制器应用于并联型有源电力滤波器的电流跟踪控制环节。推导了该改进型线性自抗扰控制器的数学模型,并利用频域分析法对改进型线性自抗扰控制器的控制性能进行了分析。最后,利用Matlab/Simulink仿真平台对在改进型线性自抗扰控制器控制下的并联型有源电力滤波器电流跟踪性能进行仿真验证,并与传统线性自抗扰控制器进行对比分析。结果表明,通过引入新的误差,提高了线性扩张状态观测器对总扰动的观测能力,使得该改进型线性自抗扰控制器优于传统的线性自抗扰控制器,具有良好的跟踪和抗扰动能力。

To improve the dynamic tracking speed and anti-disturbance capability of a shunt active power filter(SAPF)for harmonic current,an improved linear active disturbance rejection controller(LADRC)based on the basic principle of error control is proposed in this paper.The improved LADRC introduces a new error as the basis for adjusting the to⁃tal disturbance in the linearly expanded state observer(LESO).In addition,under the premise of system stability,this controller is applied to the SAPF current-tracking control link.A mathematical model of the improved LADRC is de⁃rived,and its control performance is analyzed using the frequency-domain analysis method.Finally,the Matlab&Simu⁃link simulation platform is used to simulate and verify the SAPF’s current-tracking performance under the improved LADRC control,and the novel LADRC is compared with traditional one.Results show that by introducing new errors,the LESO’s ability to observe the total disturbance is improved,so that the improved LADRC is superior to the tradi⁃tional one,with better tracking and anti-disturbance capabilities.