LCL有源电力滤波器新型控制方法

LCL有源电力滤波器系统稳态误差和稳定性受到电网参数(频率、阻抗)摄动的影响。该文提出一种新的控制方法。包括两个部分,使用传统广义积分器时,电网频率漂移会使其对各次谐波处的积分增益大幅减小,从而增大系统的稳态误差,对此提出一种基于参数在线调整的新型广义积分器;此外为了抑制系统中LCL滤波器谐振,需要加入无源或有源阻尼。电网阻抗在较大范围内变化,会使阻尼作用减弱甚至引起系统不稳定,为此提出基于滑模控制的新型有源阻尼方法。仿真和实验结果证明,新的控制方法使系统对电网参数具有良好的鲁棒性。

Novel Control Method for LCL Active Power Filter

A novel control approach was presented for a LCL-filter-based active power filter (APF), since the stability and steady-state error of the APF were influenced by grid parameter varying. The control approach consists of a novel generalized integrator and a novel active damping. The gain of traditional generalized integrator was attenuated at harmonic frequency by the grid frequency excursion, which made the steady-state error increase. This problem is solved by the novel generalized integrator based on param...