多电飞机变频交流供电系统工作模态多，交流频率变化范围广，常规民用LCL整流器故障诊断及容错控制难以满足多电飞机对环境适应性、可靠性等方面的要求。本项目研究基于宽禁带电力电子器件的飞机变频交流LCL整流器，建立变频交流条件下整流器控制带宽设计和LCL滤波器有源阻尼控制方法；在此控制方法基础上，提出一种基于LCL滤波器谐振特性配置的软故障特征构造方法，将故障诊断问题转化为电流谐振监视问题，实现提高故障在交流变频环境下的辨识度，并设计无源器件参数退化轨迹下系统故障特征标尺；针对构建的系统故障特征标尺，设计基于小波包分析的谐波能量收集器进行故障诊断，通过对谐振特征能量反馈控制实现自适应有源阻尼及整流器容错控制；最后，搭建仿真及实验平台对所设计的故障诊断与容错控制策略进行验证。通过本项目的基础研究，将有效地提高多电飞机变频交流供电系统LCL整流器应对故障的能力，提高多电飞机的可靠性及飞行安全性。

The variable frequency AC (VFAC) power supply systems of more electric aircraft (MEA) have multiple operation modes and wide AC frequency variation range. Traditional fault diagnosis and fault-tolerant control for the LCL filtered converter cannot meet the requirements of environmental adaptability, and reliability proposed by MEA. This project will research the wide bandgap power device based LCL active rectifier for VFAC power supply system, and explore the current control bandwidth and active damping design method under wide AC frequency variation condition. Based on the designed controller, this project will propose a fault feature construct method for filter soft fault based on LCL resonant allocation. The proposed feature transfer the fault diagnosis issue to the current resonant detection issue and make the fault feature more strength to be identified under wide AC frequency variation condition in MEA. A group of feature resonant frequency will be set to indicate the filter parameter degradation, and then wavelet pack analysis based harmonic energy aggregator will be used to monitor the feature resonant energy. Based on the aggregated resonant energy, an adaptive active damping will be designed to guarantee the stability of the converter under fault, and realize the fault-tolerant control. Simulation and experimental setup will be employed to verify the proposed fault diagnosis and fault-tolerant control method. Successful implementation of the methods proposed in this proposal will effectively improve the protection ability of MEA VFAC LCL converter against soft faults, and further improve the reliability and flight safety of more electric aircraft systems.