基于Lyapunov函数的直驱式风力发电机的无速度传感器直接功率控制

摘要

针对直驱式风力发电机无速度传感器中滑模辩识的感应电势产生高频脉动的缺点,采用近似滑模控制对电机的正弦波感应电势进行辨识,并采用直接功率控制模型进行功率控制.由于直接功率控制模型中只存在角频率,降低了相位跟踪过程中控制器的设计难度,提高了系统转速的响应速度.采用Lyapunov函数对角速度进行辨识,保证了系统稳定,取消了数字锁相环,实现更加简单.仿真结果表明,所提控制模型及方法能准确控制电机功率,提高了电机响应速度.%As the induced electromotive force of SMO(Sliding Mode Observer) in sensorless PMSG(Perma-nent Magnet Synchronous Generator) control of direct-driven wind power system produces high frequency pulses.it is proposed to apply approximate SMO in the sine wave identification of induced electromotive force and to adopt the direct power control model in power control. Since there is only angular frequency, the controller design used in phase tracking is simplified and the response of system speed is enhanced. The angular speed is recognized with Lyapunov function to ensure the system stability and no PLL is used to simplify the implementation. Simulative results show that the proposed control model controls the power of PMSG accurately and improves the response speed of PMSG.