MPPT控制器的线性自抗扰控制

MPPT controller based on linear active disturbance rejection control

光伏并网发电系统极易受到外部环境的影响,并且抗干扰能力较差。环境改变、电网不稳定或参数难以确定等原因都会对电能输出效率和其工作效率造成很大影响。针对光伏系统的这些特性,提出一种线性自抗扰控制器对电流进行控制。采用扩张状态观测器对扰动进行补偿,从而快速消除扰动,达到平和状态,使系统对扰动有着很好的适应能力。为了验证该算法的有效性,通过Matlab/Simulink仿真表明,加入自抗扰控制器能够明显提高光伏并网系统的跟踪速度和控制性能,降低了功率震荡,在外界环境突变的情况下,也能够达到很好的效果。

The photovoltaic grid⁃connected power generation system is vulnerable to the impact of external environment,resulting poor anti⁃interference ability.Environmental changes,instable grids or uncertain parameters will have a great impact on the power output efficiency and the work efficiency.In view of the above characteristics of photovoltaic system,a linear active disturbance rejection controller(LADRC)is proposed to control the current.An extended state observer is used to make compensation to the disturbance,thus to quickly eliminate the disturbance and reach a peaceful state,which make the system well adaptable to the disturbance.The matlab/simulink simulation experiments are performed to verify the effectiveness of the algorithm.The results show that adding ADRC can significantly improve the tracking speed and control performance of photovoltaic grid⁃connected system,reduce power oscillation,and achieve good effect even in the case that the external environment changes unexpectedly.