中文摘要：

检修维护完毕的双馈风力发电机并网后,当工作在亚同步发电状态时,其转子会吸收工作在超同步发电状态的双馈风力发电机产生的有功功率,伴随着功率传递而产生的谐波干扰会影响风力发电机的正常工作。而在亚同步发电状态下,双馈电机的转差率和转子侧吸收的有功功率有着直接的联系。通过双馈电机的等效电路对转差率变化时亚同步发电状态下双馈电机转子吸收的有功功率进行了理论分析,推导出了转差率、定子电流矢量与转子侧吸收有功功率的实时关系公式,之后通过算例分析了转差率减小时转子吸收有功功率的变化规律。在Matlab/Simulink中建立模型进行谐波干扰仿真,计算出了总谐波含量均方根值的变化情况,并分析出了伴随功率传递所产生谐波干扰的变化规律。

英文摘要：

After maintenance and grid integration, rotors of doubly-fed inductive generators（DFIGs） in sub-synchronous condition will absorb active power generated by other DFIGs in hyper-synchronous condition. Harmonic interference caused by power flow between DFIGs will impact their operation. In sub-synchronous condition, slip is directly related to active power absorbed by DFIG rotors. This paper uses DFIG equivalent circuit to analyze active power absorbed by DFIG rotors in sub-synchronous condition under slip change and deduces real-time formula of slip, stator current and rotor power. Then change rule of active power absorbed by rotors is analyzed with an example when slip is reduced. This paper builds a model, performs simulation in Matlab/Simulink, calculates total harmonic RMS value, and analyzes change rule of harmonic interference caused by power flow.