双馈风力发电机的无速度传感器控制

Speed Sensorless Control of the Doubly-fed Wind Power Generator

变速恒频风电系统中,速度传感器的使用降低了双馈发电系统的可靠性。提出一种基于自适应降阶观测器的速度辨识方案。采用李亚普诺夫稳定性理论,经过严格推导得出了速度辨识自适应律,对双馈电机转速进行在线辨识;利用极点配置得到观测器的增益。以自适应降阶观测器和矢量控制方案设计了无速度传感器双馈风力发电机矢量控制系统。仿真结果表明自适应降阶观测器具有良好的动、静态性能;能够准确获取双馈电机转速与角度信息,响应速度快。

In the variable-speed constant-frequency wind power system,the use of speed sensor reduces the reliability of doubly-fed generator system.A speed identification scheme was proposed based on adaptive reduced order observer.By using the Lyapunov stability theory,the speed identification adaptive law was derived strictly.And the gain of the observer was obtained by using pole-placement technique.A speed sensorless control system for doubly-fed induction generator wind turbine was designed by using the speed adaptive reduced order observer and the vector control technique.Simulation results show that the adaptive reduced order observer has a good dynamic and static performance,and can obtain accurate speed and phase angle information of doubly-fed induction generator,and has fast response.