摘要：为了实现双馈感应发电机在单相跌落故障下的低电压穿越。该文基于双馈感应发电机定、转子磁链的瞬态变化机理，对双馈感应发电机单相跌落故障瞬态特性进行研究，推导出了双馈感应发电机在发生单相跌落故障时的定、转子电流、电磁转矩、输出有功功率与无功功率的解析表达式。以瞬态特性分析为基础，提出在单相跌落故障下，以消除谐波分量为目的的低电压穿越控制策略，并对该控制策略下双馈感应发电机在低电压穿越时的电流、转矩和功率进行研究。理论分析和仿真结果均表明，在单相电压跌落故障时，该文的控制策略，既能够实现对双馈感应发电机的保护，又能够向电网提供无功支撑。
关键词：风力发电；  双馈感应发电机； 单相跌落故障；  瞬态特性；  低电压穿越
Abstract: In order to realize the doublyfed induction generator LVRT during singlephase drop fault. This paper utilized the transient change mechanism of DFIG stator and rotor flux, in the case of singlephase drop fault, deduced and obtained analytical expressions about stator transient current, electromagnetic torque, output active power and reactive power of DFIG. On the basis of transient characteristic analysis, proposed the LVRT control strategy by eliminating the harmonic component, else researched the current, torque and power under the control strategy during LVRT. Theoretical analysis and simulation results show that the control strategy can not only protect the doublyfed generator, but also can provide reactive power to the power grid.
Key words: wind power generation; doublyfed induction generator; singlephase drop fault; transient characteristic; LVRT