中文摘要：

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。

英文摘要：

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 parameter adjusted online. Otherwise a passive or active damping was needed to restrain the resonance of LCL filter, but the possible wide range of grid impedance values weakened the effectiveness of the damping, even challenged the stability of the LCL-filter-based APF system. Therefore the novel active damping based on sliding mode control was designed. The simulation and experiment results demonstrate that the control approach makes the APF system have a good robustness.