电网异常条件下的DFIG转子位置观测器

The rotor position observer design of DFIG under unbalanced network conditions

论文根据双馈感应发电机(DFIG)在电网异常条件下的数学模型,提出一种滞环转子位置观测器来获得转子位置角。该观测器的实现主要依据实际转子电流和估算转子电流正序分量的相位偏差,采用滞环控制器来调节估算转子位置。此观测器结构简单,无需调节任何参数,实现方便;所提出的观测器既适应于理想电网条件下DFIG的运行控制,也适用于电网异常情况下DFIG的故障穿越运行。搭建了双馈风力发电系统仿真模型,对提出的控制策略进行仿真验证。仿真结果验证了所提方案的可行性和正确性。

A hysteresis rotor position observer was presented to acquire the rotor position angle based on mathematical model of the doubly-fed induction generator（ DFIG） under unbalanced network conditions.The observer estimated the rotor position and speed by hysteresis controller to adjust the phase deviation between actual rotor current and estimated positive sequence component of the rotor current,the system structure is relatively simple,without adjusting any parameters,easy to achieve. Simulation model for wind energy generation system-with DFIG is set up.The simulation results show that the control strategy is feasible and efficient.