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直流侧电压的稳定控制是保证有源电力滤波器(activepower filter,APF)正常工作的关键环节之一。对APF直流侧电压进行建模,在dq坐标系中分析了直流侧电压与d轴电流的数学关系,进而提出了APF直流侧电压自抗扰控制器的整体设计方法,给出了自抗扰控制器中的跟踪微分单元、扩张状态观测器和误差反馈单元的设计方法,并采用线性方法对该控制器进行优化,提高了响应速度与控制精度。仿真与试验结果验证了该设计方法的可行性。
The stable control of DC voltage is one of the key steps to ensure the active power filter (APF) work properly. The DC link voltage of APF was modeled, the mathematical relationship between DC link voltage and d-axis current was analyzed in dq coordinate system, and the whole design method of DC link voltage ADRC controller was put forward. The controller of the tracking differential unit, the expansion of the state observer and the error feedback unit design method, and the linear method to optimize the controller to improve the response speed and control accuracy. Simulation and experimental results verify the feasibility of this design method.