基于自抗扰及无传感器的PMSG最大功率追踪控制

Maximum power tracking control of PMSG based on active disturbance rejection and sensorless

针对海上风力发电机最大功率追踪传统矢量控制响应速度差、抗扰性能不足与传统滑模观测器观测精度差等问题,提出一种改进双环自抗扰及自适应全阶滑模观测器的控制策略。采用光滑连续函数替换fal函数,以削弱抖振;设计自适应率以获得更为平滑的反电动势,引入锁相环算法估计转子转速与位置角。对比实验表明,本文策略在转速跟踪响应速度上提高约24.3%,最大转速误差由0.70降为0.34 rpm,最大转子位置误差由0.045降为0.012 rad,在稳态时观测精度也有明显提高。在该策略下系统抗扰性能得到增强、响应速度得到提升、观测精度明显改善,提高了最大功率追踪效果。

Aiming at the problems of poor response speed,insufficient anti-disturbance performance and poor observation accuracy of traditional sliding mode observer in maximum power tracking of offshore wind turbines,a control strategy of improved dual-loop anti-disturbance control and adaptive full-order sliding mode observer is proposed.The fal function is replaced by a smooth continuous function to weaken the jitter;the adaptive rate is designed to obtain a smoother back electromotive force,and a phase-locked loop algorithm is introduced to estimate the rotor speed and position angle.Comparative experiments show that the strategy proposed in this paper improves the speed tracking response speed by about 24.3%,the maximum speed error is reduced from 0.70 to 0.34 rpm,and the maximum rotor position error is reduced from 0.045 to 0.012 rad.The observation accuracy is also significantly improved in steady state.Under this strategy,the system anti-disturbance performance is enhanced,the response speed is improved,and the observation accuracy is significantly improved,which improves the maximum power tracking effect.