中文摘要：

针对双馈风力发电机组叶轮质量不平衡故障展开研究，综合考虑机组最大风能追踪控制策略（MPPT）以及转子侧矢量控制策略，分析叶轮质量不平衡故障对双馈风力发电机电气特性的影响，推导转子电流的解析表达式，并得出定子电流和功率的变化特性。然后在Matlab／Simulink平台进行仿真，并通过实验进行验证。仿真和实验表明，叶轮质量不平衡故障时双馈风力发电机功率发生波动，频率为叶轮转频及其倍频；定、转子电流中除基波外还包含调制谐波，调制频率为叶轮转频及其倍频。

英文摘要：

The blade mass imbalance fault of wind turbines with doubly-fed induction generator （DFIG） is studied in this paper. Considering the Maximum Power Point Tracking （MPPT） and the rotor-side convertor vector control strategies, the doubly-fed induction generator electrical characteristics are discussed under blade mass imbalance fault. The analytical expression of rotor current is derived and its influence on the stator current and power is also analyzed. Then in order to verify the conclusion, the simulation under the Matlab/Simulink environment and the experiment are carried out. Both the simulation and experiment results show that there exists harmonic in the stator and rotor current and the output power. The fault characteristic frequencies include not only the blade rotating frequency but also the multiple rotating frequency of blade.