随着多电飞机非线性用电负载不断增多，飞机电网电流谐波污染问题亟待解决。有源电力滤波器体积小、重量轻、谐波抑制能力强，在飞机电网中具有广阔应用前景，但多电飞机电网频率变化范围大，现有工频电网有源电力滤波方法无法直接使用。本项目针对适用于多电飞机变频电网的有源电力滤波方法进行深入研究。在电流谐波检测方面，将电流视为关于未知电网频率的动态系统，拟提出一种有限时间估计器设计方法对系统参数进行辨识，以实现电流谐波检测，其优势在于不依赖于锁相环，在电网频率大范围变化时，可确保稳态精度且具有快速动态响应。在电流跟踪方面，拟提出一种鲁棒输出调节器设计方法，以实现有源阻尼电流跟踪。其优势在于在保证稳态精度的前提下，着重改善对电网频率大范围变化的适应能力，提高对LCL滤波器参数变化的鲁棒性。研究成果将完善机载有源电力滤波的理论基础和控制方法，也可推广到其他电网电能质量改善领域。

With the increase of nonlinear loads in more electric aircraft, the problem of current harmonic pollution in aircraft grids urgently requires to be solved. With advantages of small volume, light weight and good performance of harmonic suppression, active power filters have a strong application prospect in aircraft power systems. However, grid frequency in more electric aircraft changes widely and hence existing methods for active power filters cannot be applied directly. In this project, active power filter methods for variable frequency power grids of more electric aircraft are studied. In the direction of current harmonic detection, regarding grid current as a dynamic system related to an unknown grid frequency, a finite time estimation is proposed to identify the system parameters, and then the current harmonic estimation is achieved. This method, not relying on phase locked loops, has good steady-state accuracy when the frequency of power grids varies widely. Also, the use of finite time estimation theory ensures its fast dynamic response. In the detection of the current tracking, a controller based on robust output regulation theory is designed to achieve active damping for LCL-filter-based current tracking. Meanwhile, when the power grid contains harmonics or the parameters of LCL-filter change, the proposed method still has high steady-state accuracy and strong robustness. The research results will improve the theoretical basis and control methods of active power filters for more electric aircraft. In addition, the results of this project can be applied to other fields of power quality improvements.