中文摘要：

双馈风力发电机转子绕组的状态监测与故障诊断技术能够及时发现并诊断转子绕组故障,有效地降低风电场的运行和维护费用。通过仿真分析发现转子变换器不同控制策略对故障特征信号提取的影响,建立实验平台,并通过分析实验数据验证其正确性。首先,利用PSCAD软件建立双馈风力发电机转子绕组故障模型,其中转子变换器分别采用SVPWM矢量控制和滞环电流矢量控制,通过仿真分析,得出特征信号转子电压和转子电流进行诊断的适用范围;然后在动模实验室建立转子绕组故障诊断实验平台,考虑发电机变速及交变载荷的实际工况。最后,通过对特征信号进行频谱分析验证转子变换器控制策略对其的影响。

英文摘要：

Condition monitoring and fault diagnosis of rotor windings of double fed induction generators（DFIG） can detect the fault timely and reduce operations and maintenance costs for wind turbines effectively.From the simulation,the impact on extraction of fault characteristic signals from different control strategies of the rotor-side converter is found,and an experimental platform is established.Also through analyzing the experimental data,the correctness of simulation results is validated.First,a double fed induction generator’s rotor fault model is established by using PSCAD software,where SVPWM vector control and hysteresis current vector control are applied in the control strategies of the rotor-side converter.From the simulation analysis,the diagnostic scope of characteristic signals including the rotor current and the rotor voltage is derived.In addition,the experimental platform of rotor fault diagnosis is built in the laboratory considering the change of generator’s speed and loads.Finally,the characteristic signals are analyzed to validate the impact of control strategies of the rotor-side converter.