双馈风力发电机无速度传感器控制

RESEARCH ON SPEED SENSORLESS CONTROL OF DOUBLY FED WIND POWER GENERAYOR

提出了一种新型的基于模型参考自适应原理的双馈风力发电机的无速度传感器矢量控制方案。根据双馈风力发电机运行的特点,针对双馈发电机并网前空载励磁阶段和并网后发电运行阶段分别采用了不同的无速度传感器矢量控制方案。在发电机并网前,根据双馈发电机空载时定子侧电压矢量的q轴分量估计发电机并网前转速及转子位置。在并网运行阶段采用了一种基于双馈电机磁链关系的模型参考自适应方法进行转速及转子位置的跟踪。最后在理论分析的基础上,在实验室的双馈风力发电机组模拟平台上进行了实验研究。实验结果证明了该文提出的双馈风力发电机无速度传感器矢量控制方案的正确性和可行性。

A novel speed sensorless vector control strategy of doubly fed induction generator（DFIG）, which was based on model reference adaptive control （MRAC） method was proposed. Due to the operation characteristic of DFIG, two closeloop control strategies were adopted to estimate the rotor speed and position based on the generator grid-connect condition, respectively. Before the grid connection, the rotor speed and position were estimated through the q axis component of generator stator voltage. When the generator was connected to the grid, the MRAC method based on the electromagnetism relationship of DFIG was used to estimate the rotor speed and position. The proposed control strategies were implemented on a simulation platform for DFIG wind power generation system. The proposed theory was verified by experiment results.